Bump version numbers for 1.0.11 release.

Fix a possible null reference bug

See merge request briar/briar!853

.gitlab-ci.yml

@@ -1,27 +1,31 @@
-image: registry.gitlab.com/fdroid/ci-images-base:latest
-
-cache:
-  paths:
-    - .gradle/wrapper
-    - .gradle/caches
-
-before_script:
-  - set -e
-  - export GRADLE_USER_HOME=$PWD/.gradle
-  # Download OpenJDK 6 so we can compile against its standard library
-  - JDK_FILE=openjdk-6-jre-headless_6b38-1.13.10-1~deb7u1_amd64.deb
-  - if [ ! -d openjdk ]
-  - then
-  - wget -q http://ftp.uk.debian.org/debian/pool/main/o/openjdk-6/$JDK_FILE
-  - dpkg-deb -x $JDK_FILE openjdk
-  - fi
-  - export JAVA_6_HOME=$PWD/openjdk/usr/lib/jvm/java-6-openjdk-amd64
+image: briar/ci-image-android:latest
 
 test:
-  script:
-    - ./gradlew test
+  before_script:
+    - set -e
+    - export GRADLE_USER_HOME=$PWD/.gradle
 
-after_script:
-    # this file changes every time but should not be cached
+  cache:
+    paths:
+      - .gradle/wrapper
+      - .gradle/caches
+
+  script:
+    - ./gradlew --no-daemon animalSnifferMain animalSnifferTest
+    - ./gradlew --no-daemon test
+
+  after_script:
+    # these file change every time but should not be cached
     - rm -f $GRADLE_USER_HOME/caches/modules-2/modules-2.lock
     - rm -fr $GRADLE_USER_HOME/caches/*/plugin-resolution/
+
+
+test_reproducible:
+  image: briar/reproducer:latest
+
+  script:
+    - cd /opt/briar-reproducer
+    - ./reproduce.py ${CI_COMMIT_REF_NAME}
+
+  only:
+    - tags

bramble-android/build.gradle

@@ -1,11 +1,5 @@
-import de.undercouch.gradle.tasks.download.Download
-import de.undercouch.gradle.tasks.download.Verify
-
-import java.security.NoSuchAlgorithmException
-
 apply plugin: 'com.android.library'
 apply plugin: 'witness'
-apply plugin: 'de.undercouch.download'
 
 android {
 	compileSdkVersion 27
@@ -14,8 +8,8 @@ android {
 	defaultConfig {
 		minSdkVersion 14
 		targetSdkVersion 26
-		versionCode 10001
-		versionName "1.0.1"
+		versionCode 10011
+		versionName "1.0.11"
 		consumerProguardFiles 'proguard-rules.txt'
 	}
 
@@ -25,9 +19,14 @@ android {
 	}
 }
 
+configurations {
+	tor
+}
+
 dependencies {
 	implementation project(path: ':bramble-core', configuration: 'default')
-	implementation fileTree(dir: 'libs', include: '*.jar')
+	implementation 'org.briarproject:jtorctl:0.3'
+	tor 'org.briarproject:tor-android:0.2.9.15@zip'
 
 	annotationProcessor 'com.google.dagger:dagger-compiler:2.0.2'
 
@@ -36,32 +35,32 @@ dependencies {
 
 dependencyVerification {
 	verify = [
-			'com.android.tools.analytics-library:protos:26.1.2:protos-26.1.2.jar:52672a0b42b572a06aecc3535d5068eb46c0e15d129b9f1085d3c16a1da5cdbb',
-			'com.android.tools.analytics-library:shared:26.1.2:shared-26.1.2.jar:5c7e0eda18c6f87feeb83628c707e8aaa3298b41fb72e38efe31ad1675f9e8e9',
-			'com.android.tools.analytics-library:tracker:26.1.2:tracker-26.1.2.jar:06f97aa0adf44ffb06f8681c6a79d9be153a08f61d21eddc42b8d3db96df4282',
-			'com.android.tools.build:apksig:3.1.2:apksig-3.1.2.jar:40696a4559124d1d57873d208857eee059d48859239d569c7d18374ac644a8be',
-			'com.android.tools.build:builder-model:3.1.2:builder-model-3.1.2.jar:d49bfa2a135c9562b6ca7aa4342036cfa1582c7074c2d1d93d1dae8b3a134e17',
-			'com.android.tools.build:builder-test-api:3.1.2:builder-test-api-3.1.2.jar:dfe2a50b740d41b11189101062434d4283d18647e89a492ad51710c719363e9f',
-			'com.android.tools.build:builder:3.1.2:builder-3.1.2.jar:b60f825a42e2efe8433619fbc759f3d9effecab718279048d36881188ceb1d14',
-			'com.android.tools.build:gradle-api:3.1.2:gradle-api-3.1.2.jar:e58bcc5b893e4583ab0f5c8ef89c4dbcce202b405a9d7fcc116d21e5357d4893',
-			'com.android.tools.build:manifest-merger:26.1.2:manifest-merger-26.1.2.jar:9c61c27ea5266573107b954acf1216d398f4d7e7ae6fad6409d6b2b767eb091c',
-			'com.android.tools.ddms:ddmlib:26.1.2:ddmlib-26.1.2.jar:18a2a5fbef36882f07d03c2b9e59eba05cf8248177bf5cbff736e4b582804c44',
-			'com.android.tools.external.com-intellij:intellij-core:26.1.2:intellij-core-26.1.2.jar:37c5acf279f1ae3e85b1a5be3c9f15f43bde7b08f978eefefffb9c4035760c52',
-			'com.android.tools.external.com-intellij:kotlin-compiler:26.1.2:kotlin-compiler-26.1.2.jar:152df0bee7580326c77316b669a9d96e3b09efb1d45f545dce4147271b0b8944',
-			'com.android.tools.external.org-jetbrains:uast:26.1.2:uast-26.1.2.jar:02d39582206d3f5fc0a6cb18bfd9e8b9f9c1acb805ec6dac08b4e3a56849d279',
-			'com.android.tools.layoutlib:layoutlib-api:26.1.2:layoutlib-api-26.1.2.jar:20220039fcc7d799f928153beff862e704457c0f55ab44258f3745ebeb662b4f',
-			'com.android.tools.lint:lint-api:26.1.2:lint-api-26.1.2.jar:e1d5b62b870a7c566e9877a6b96b27784a4d713f8caa07fdcb4705d47a40a1d9',
-			'com.android.tools.lint:lint-checks:26.1.2:lint-checks-26.1.2.jar:211e2afd58504372385d71b1e5be982c2b5121ab6fee1c04ddabeb75a8729e07',
-			'com.android.tools.lint:lint-gradle-api:26.1.2:lint-gradle-api-26.1.2.jar:71284f2a8b03c3e55c94511c9eb36f8184fbb85324325fc6b78abf5183f03d90',
-			'com.android.tools.lint:lint-gradle:26.1.2:lint-gradle-26.1.2.jar:855f0c82b7fc690df1b7319c0774f7517f7f8f5dd4eee1f6077dcf50e07c6240',
-			'com.android.tools.lint:lint-kotlin:26.1.2:lint-kotlin-26.1.2.jar:1e591f70bcbbc11569720a9bbcca2bc1f3d4f789f01f40f642848d920643d484',
-			'com.android.tools.lint:lint:26.1.2:lint-26.1.2.jar:93736c62e9f1976998c2b4aa716aea0734cdb162d05502f4af7292654aedb182',
-			'com.android.tools:annotations:26.1.2:annotations-26.1.2.jar:72773dcaf5c4ccca828e3c8467f1b78a8a00b3cc5f8ad1aab88fcf9379928018',
-			'com.android.tools:common:26.1.2:common-26.1.2.jar:ea4320f0c17dcbc4491896bb705c4d25ec08bd62ef02ab0579fe154e75e788e6',
-			'com.android.tools:dvlib:26.1.2:dvlib-26.1.2.jar:1187aa4fb666595c96c4deb6bc0e0f4b7e396bde9f6243330b49a232946130ea',
-			'com.android.tools:repository:26.1.2:repository-26.1.2.jar:8b86e512ad6d32bd76989451eefe2b271f5efce6d4d65ecb173afaf14606e01a',
-			'com.android.tools:sdk-common:26.1.2:sdk-common-26.1.2.jar:23584720a60a21cdcb5b1ec10269e3013789d6805d153cc696c39ec7ce251896',
-			'com.android.tools:sdklib:26.1.2:sdklib-26.1.2.jar:d3870fafc59ab8efa70d3f9649f40ee299c8ec5b58377b06e8853d7272a5bf4e',
+			'com.android.tools.analytics-library:protos:26.1.3:protos-26.1.3.jar:818c9f256f141d9dafec03a1aa2b94d240b2c140acfd7ee31a8b3e6c2b9479e3',
+			'com.android.tools.analytics-library:shared:26.1.3:shared-26.1.3.jar:7110706c7ada96c8b6f5ca80c478291bc7899d46277de2c48527e045442401a3',
+			'com.android.tools.analytics-library:tracker:26.1.3:tracker-26.1.3.jar:4155424bf2ce4872da83332579a1707252bc66cbd77c5144fdc4483d0f2e1418',
+			'com.android.tools.build:apksig:3.1.3:apksig-3.1.3.jar:7e1f8e675a6e768e5b56405e41d6c3cc05befe62e601b04177de1029902c9c89',
+			'com.android.tools.build:builder-model:3.1.3:builder-model-3.1.3.jar:06ad1c422d679fc698451479cb40ba863849d67bfd1de23f6d2c16d78b024b0b',
+			'com.android.tools.build:builder-test-api:3.1.3:builder-test-api-3.1.3.jar:4d989f780436794f0f8b2f50e9e079b786571eac90f26c208ab2ae6d4012f389',
+			'com.android.tools.build:builder:3.1.3:builder-3.1.3.jar:8a1092012c89d0ec1ee2eff09c5708c71ef4482a6862df8d3a44a67fccace01c',
+			'com.android.tools.build:gradle-api:3.1.3:gradle-api-3.1.3.jar:01e4df521456aef66514336f1d492346730dd1fb8f6433a89f62da834941ed72',
+			'com.android.tools.build:manifest-merger:26.1.3:manifest-merger-26.1.3.jar:1e4fc7e932adb4607082409800e5e6fccb42e6c5360ae5990094bf522f3ada55',
+			'com.android.tools.ddms:ddmlib:26.1.3:ddmlib-26.1.3.jar:c54931cd68df5d1ea2923b3b320eae47cd2307a5a916bb8674c0acf93cd1d3cd',
+			'com.android.tools.external.com-intellij:intellij-core:26.1.3:intellij-core-26.1.3.jar:af67f5535fef2e1a28b1007a4acb8c5deb6a1e33b8afe7b11d012c9e778ebcec',
+			'com.android.tools.external.com-intellij:kotlin-compiler:26.1.3:kotlin-compiler-26.1.3.jar:c746d2859dc11cc05c84b692b3498d3a621e0929511f8440ee009c6557838fd4',
+			'com.android.tools.external.org-jetbrains:uast:26.1.3:uast-26.1.3.jar:3f3f6651d0c7685a77ecb22e9c82d6b49fdf24322c17360768dc530678f43265',
+			'com.android.tools.layoutlib:layoutlib-api:26.1.3:layoutlib-api-26.1.3.jar:10bc73ce706c45629872d6a999dbe12116df64e24f47ff93b7b13121ff57b4b0',
+			'com.android.tools.lint:lint-api:26.1.3:lint-api-26.1.3.jar:6f97323f9af8deda86278717885b5c927f3766757db89709f52d11d42b6fb751',
+			'com.android.tools.lint:lint-checks:26.1.3:lint-checks-26.1.3.jar:73c3d53784c9ce3e6d5968506581918e0179645d20809927ca4a001dd766b001',
+			'com.android.tools.lint:lint-gradle-api:26.1.3:lint-gradle-api-26.1.3.jar:7ca3c4866ec21dc21d53a9d86f752b77ace6f6c610a0c9dc877313856c733d9d',
+			'com.android.tools.lint:lint-gradle:26.1.3:lint-gradle-26.1.3.jar:db0c354b8f4b6f6637e31f91c564785a59ff896325331fcbc3de7458e0b6c067',
+			'com.android.tools.lint:lint-kotlin:26.1.3:lint-kotlin-26.1.3.jar:94e2b0f4565a241561cfb8fc1222bb3f132a3b98d2a90421dbb72ee8358e7d68',
+			'com.android.tools.lint:lint:26.1.3:lint-26.1.3.jar:8d5f32c989c6d191d712e90ad3ca2d1c409313599551d04d834caa44d26c78df',
+			'com.android.tools:annotations:26.1.3:annotations-26.1.3.jar:c950430b24ac5d58fc97e7283b8f0115f99587e76e08b4e1e2aaa780f2d77323',
+			'com.android.tools:common:26.1.3:common-26.1.3.jar:7c31a90581a148ab219f615a59667f0dded7fa39b248529784474da3c2274ef2',
+			'com.android.tools:dvlib:26.1.3:dvlib-26.1.3.jar:0cae87906f53d3f1088366a916ed180a7312b6d9919b90797f238875c8492855',
+			'com.android.tools:repository:26.1.3:repository-26.1.3.jar:52d4539cc68db91b261e2a33b2c8206b26e05539078758dc28cfb3854adb4f59',
+			'com.android.tools:sdk-common:26.1.3:sdk-common-26.1.3.jar:1948603ca9ff22c7ebb3178000bffa3a9dd2ca1cc5cb0c793cae08468b8fcfc1',
+			'com.android.tools:sdklib:26.1.3:sdklib-26.1.3.jar:4adcfaad9514607098d2c51503c39811112d3050f4d1e744c01c7f08f591032b',
 			'com.google.code.findbugs:jsr305:1.3.9:jsr305-1.3.9.jar:905721a0eea90a81534abb7ee6ef4ea2e5e645fa1def0a5cd88402df1b46c9ed',
 			'com.google.code.gson:gson:2.7:gson-2.7.jar:2d43eb5ea9e133d2ee2405cc14f5ee08951b8361302fdd93494a3a997b508d32',
 			'com.google.dagger:dagger-compiler:2.0.2:dagger-compiler-2.0.2.jar:b74bc9de063dd4c6400b232231f2ef5056145b8fbecbf5382012007dd1c071b3',
@@ -92,6 +91,8 @@ dependencyVerification {
 			'org.apache.httpcomponents:httpmime:4.1:httpmime-4.1.jar:31629566148e8a47688ae43b420abc3ecd783ed15b33bebc00824bf24c9b15aa',
 			'org.bouncycastle:bcpkix-jdk15on:1.56:bcpkix-jdk15on-1.56.jar:7043dee4e9e7175e93e0b36f45b1ec1ecb893c5f755667e8b916eb8dd201c6ca',
 			'org.bouncycastle:bcprov-jdk15on:1.56:bcprov-jdk15on-1.56.jar:963e1ee14f808ffb99897d848ddcdb28fa91ddda867eb18d303e82728f878349',
+			'org.briarproject:jtorctl:0.3:jtorctl-0.3.jar:f2939238a097898998432effe93b0334d97a787972ab3a91a8973a1d309fc864',
+			'org.briarproject:tor-android:0.2.9.15:tor-android-0.2.9.15.zip:34a6474ee219ffa52e0f3393e917dda6ed03d320b02247d4fa5075aa4094ee6d',
 			'org.codehaus.groovy:groovy-all:2.4.12:groovy-all-2.4.12.jar:6a56af4bd48903d56bec62821876cadefafd007360cc6bd0d8f7aa8d72b38be4',
 			'org.codehaus.mojo:animal-sniffer-annotations:1.14:animal-sniffer-annotations-1.14.jar:2068320bd6bad744c3673ab048f67e30bef8f518996fa380033556600669905d',
 			'org.glassfish.jaxb:jaxb-core:2.2.11:jaxb-core-2.2.11.jar:37bcaee8ebb04362c8352a5bf6221b86967ecdab5164c696b10b9a2bb587b2aa',
@@ -112,81 +113,9 @@ dependencyVerification {
 	]
 }
 
-ext.torBinaryDir = 'src/main/res/raw'
-ext.torVersion = '0.2.9.14'
-ext.geoipVersion = '2017-11-06'
-ext.torDownloadUrl = 'https://briarproject.org/build/'
-
-def torBinaries = [
-		"tor_arm"    : '1710ea6c47b7f4c1a88bdf4858c7893837635db10e8866854eed8d61629f50e8',
-		"tor_arm_pie": '974e6949507db8fa2ea45231817c2c3677ed4ccf5488a2252317d744b0be1917',
-		"tor_x86"    : '3a5e45b3f051fcda9353b098b7086e762ffe7ba9242f7d7c8bf6523faaa8b1e9',
-		"tor_x86_pie": 'd1d96d8ce1a4b68accf04850185780d10cd5563d3552f7e1f040f8ca32cb4e51',
-		"geoip"      : '8239b98374493529a29096e45fc5877d4d6fdad0146ad8380b291f90d61484ea'
-]
-
-def verifyOrDeleteBinary(name, chksum, alreadyVerified) {
-	return tasks.create("verifyOrDeleteBinary${name}", VerifyOrDelete) {
-		src "${torBinaryDir}/${name}.zip"
-		algorithm 'SHA-256'
-		checksum chksum
-		result alreadyVerified
-		onlyIf {
-			src.exists()
-		}
-	}
-}
-
-def downloadBinary(name, chksum, alreadyVerified) {
-	return tasks.create([
-			name: "downloadBinary${name}",
-			type: Download,
-			dependsOn: verifyOrDeleteBinary(name, chksum, alreadyVerified)]) {
-		src "${torDownloadUrl}${name}.zip"
-				.replace('tor_', "tor-${torVersion}-")
-				.replace('geoip', "geoip-${geoipVersion}")
-				.replaceAll('_', '-')
-		dest "${torBinaryDir}/${name}.zip"
-		onlyIf {
-			!dest.exists()
-		}
-	}
-}
-
-def verifyBinary(name, chksum) {
-	boolean[] alreadyVerified = [false]
-	return tasks.create([
-			name     : "verifyBinary${name}",
-			type     : Verify,
-			dependsOn: downloadBinary(name, chksum, alreadyVerified)]) {
-		src "${torBinaryDir}/${name}.zip"
-		algorithm 'SHA-256'
-		checksum chksum
-		onlyIf {
-			!alreadyVerified[0]
-		}
-	}
-}
-
 project.afterEvaluate {
-	torBinaries.every { name, checksum ->
-		preBuild.dependsOn.add(verifyBinary(name, checksum))
-	}
-}
-
-class VerifyOrDelete extends Verify {
-
-	boolean[] result
-
-	@TaskAction
-	@Override
-	void verify() throws IOException, NoSuchAlgorithmException {
-		try {
-			super.verify()
-			result[0] = true
-		} catch (Exception e) {
-			println "${src} failed verification - deleting"
-			src.delete()
-		}
+	copy {
+		from configurations.tor.collect { zipTree(it) }
+		into 'src/main/res/raw'
 	}
 }

bramble-android/src/main/java/org/briarproject/bramble/BrambleAndroidModule.java

@@ -1,12 +1,10 @@
 package org.briarproject.bramble;
 
-import org.briarproject.bramble.plugin.AndroidPluginModule;
 import org.briarproject.bramble.system.AndroidSystemModule;
 
 import dagger.Module;
 
 @Module(includes = {
-		AndroidPluginModule.class,
 		AndroidSystemModule.class
 })
 public class BrambleAndroidModule {

bramble-android/src/main/java/org/briarproject/bramble/plugin/AndroidPluginModule.java

@@ -1,69 +0,0 @@
-package org.briarproject.bramble.plugin;
-
-import android.app.Application;
-import android.content.Context;
-
-import org.briarproject.bramble.api.event.EventBus;
-import org.briarproject.bramble.api.lifecycle.IoExecutor;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.BackoffFactory;
-import org.briarproject.bramble.api.plugin.PluginConfig;
-import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
-import org.briarproject.bramble.api.plugin.simplex.SimplexPluginFactory;
-import org.briarproject.bramble.api.reporting.DevReporter;
-import org.briarproject.bramble.api.system.AndroidExecutor;
-import org.briarproject.bramble.api.system.LocationUtils;
-import org.briarproject.bramble.api.system.Scheduler;
-import org.briarproject.bramble.plugin.bluetooth.AndroidBluetoothPluginFactory;
-import org.briarproject.bramble.plugin.tcp.AndroidLanTcpPluginFactory;
-import org.briarproject.bramble.plugin.tor.TorPluginFactory;
-
-import java.security.SecureRandom;
-import java.util.Arrays;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.concurrent.Executor;
-import java.util.concurrent.ScheduledExecutorService;
-
-import javax.net.SocketFactory;
-
-import dagger.Module;
-import dagger.Provides;
-
-@Module
-public class AndroidPluginModule {
-
-	@Provides
-	PluginConfig providePluginConfig(@IoExecutor Executor ioExecutor,
-			@Scheduler ScheduledExecutorService scheduler,
-			AndroidExecutor androidExecutor, SecureRandom random,
-			SocketFactory torSocketFactory, BackoffFactory backoffFactory,
-			Application app, LocationUtils locationUtils, DevReporter reporter,
-			EventBus eventBus) {
-		Context appContext = app.getApplicationContext();
-		DuplexPluginFactory bluetooth =
-				new AndroidBluetoothPluginFactory(ioExecutor, androidExecutor,
-						appContext, random, eventBus, backoffFactory);
-		DuplexPluginFactory tor = new TorPluginFactory(ioExecutor, scheduler,
-				appContext, locationUtils, reporter, eventBus,
-				torSocketFactory, backoffFactory);
-		DuplexPluginFactory lan = new AndroidLanTcpPluginFactory(ioExecutor,
-				scheduler, backoffFactory, appContext);
-		Collection<DuplexPluginFactory> duplex =
-				Arrays.asList(bluetooth, tor, lan);
-		@NotNullByDefault
-		PluginConfig pluginConfig = new PluginConfig() {
-
-			@Override
-			public Collection<DuplexPluginFactory> getDuplexFactories() {
-				return duplex;
-			}
-
-			@Override
-			public Collection<SimplexPluginFactory> getSimplexFactories() {
-				return Collections.emptyList();
-			}
-		};
-		return pluginConfig;
-	}
-}

bramble-android/src/main/java/org/briarproject/bramble/plugin/bluetooth/AndroidBluetoothPlugin.java

@@ -38,6 +38,7 @@ import static android.bluetooth.BluetoothAdapter.SCAN_MODE_NONE;
 import static android.bluetooth.BluetoothAdapter.STATE_OFF;
 import static android.bluetooth.BluetoothAdapter.STATE_ON;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
@@ -145,7 +146,7 @@ class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 		try {
 			if (ss != null) ss.close();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -185,7 +186,7 @@ class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 		try {
 			if (c != null) c.close();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 

bramble-android/src/main/java/org/briarproject/bramble/plugin/tor/TorPlugin.java

@@ -10,7 +10,6 @@ import android.content.pm.PackageManager.NameNotFoundException;
 import android.content.res.Resources;
 import android.net.ConnectivityManager;
 import android.net.NetworkInfo;
-import android.os.FileObserver;
 import android.os.PowerManager;
 
 import net.freehaven.tor.control.EventHandler;
@@ -32,12 +31,12 @@ import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPluginCallback;
 import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
 import org.briarproject.bramble.api.properties.TransportProperties;
-import org.briarproject.bramble.api.reporting.DevReporter;
 import org.briarproject.bramble.api.settings.Settings;
 import org.briarproject.bramble.api.settings.event.SettingsUpdatedEvent;
+import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.api.system.LocationUtils;
-import org.briarproject.bramble.util.AndroidUtils;
 import org.briarproject.bramble.util.IoUtils;
+import org.briarproject.bramble.util.RenewableWakeLock;
 import org.briarproject.bramble.util.StringUtils;
 
 import java.io.Closeable;
@@ -52,13 +51,11 @@ import java.net.InetSocketAddress;
 import java.net.ServerSocket;
 import java.net.Socket;
 import java.util.Arrays;
-import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Scanner;
-import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.Executor;
 import java.util.concurrent.Future;
 import java.util.concurrent.ScheduledExecutorService;
@@ -81,7 +78,6 @@ import static android.net.ConnectivityManager.TYPE_WIFI;
 import static android.os.Build.VERSION.SDK_INT;
 import static android.os.PowerManager.ACTION_DEVICE_IDLE_MODE_CHANGED;
 import static android.os.PowerManager.PARTIAL_WAKE_LOCK;
-import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static java.util.concurrent.TimeUnit.MINUTES;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
@@ -95,6 +91,7 @@ import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_NETWORK_
 import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_NETWORK_WIFI;
 import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_PORT;
 import static org.briarproject.bramble.api.plugin.TorConstants.PROP_ONION;
+import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubOnion;
 
 @MethodsNotNullByDefault
@@ -105,8 +102,11 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 			"CIRC", "ORCONN", "HS_DESC", "NOTICE", "WARN", "ERR"
 	};
 	private static final String OWNER = "__OwningControllerProcess";
-	private static final int COOKIE_TIMEOUT = 3000; // Milliseconds
+	private static final int COOKIE_TIMEOUT_MS = 3000;
+	private static final int COOKIE_POLLING_INTERVAL_MS = 200;
 	private static final Pattern ONION = Pattern.compile("[a-z2-7]{16}");
+	// This tag may prevent Huawei's power manager from killing us
+	private static final String WAKE_LOCK_TAG = "LocationManagerService";
 	private static final Logger LOG =
 			Logger.getLogger(TorPlugin.class.getName());
 
@@ -114,8 +114,8 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	private final ScheduledExecutorService scheduler;
 	private final Context appContext;
 	private final LocationUtils locationUtils;
-	private final DevReporter reporter;
 	private final SocketFactory torSocketFactory;
+	private final Clock clock;
 	private final Backoff backoff;
 	private final DuplexPluginCallback callback;
 	private final String architecture;
@@ -123,7 +123,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	private final ConnectionStatus connectionStatus;
 	private final File torDirectory, torFile, geoIpFile, configFile;
 	private final File doneFile, cookieFile;
-	private final PowerManager.WakeLock wakeLock;
+	private final RenewableWakeLock wakeLock;
 	private final AtomicReference<Future<?>> connectivityCheck =
 			new AtomicReference<>();
 	private final AtomicBoolean used = new AtomicBoolean(false);
@@ -136,15 +136,15 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 
 	TorPlugin(Executor ioExecutor, ScheduledExecutorService scheduler,
 			Context appContext, LocationUtils locationUtils,
-			DevReporter reporter, SocketFactory torSocketFactory,
-			Backoff backoff, DuplexPluginCallback callback,
-			String architecture, int maxLatency, int maxIdleTime) {
+			SocketFactory torSocketFactory, Clock clock, Backoff backoff,
+			DuplexPluginCallback callback, String architecture,
+			int maxLatency, int maxIdleTime) {
 		this.ioExecutor = ioExecutor;
 		this.scheduler = scheduler;
 		this.appContext = appContext;
 		this.locationUtils = locationUtils;
-		this.reporter = reporter;
 		this.torSocketFactory = torSocketFactory;
+		this.clock = clock;
 		this.backoff = backoff;
 		this.callback = callback;
 		this.architecture = architecture;
@@ -160,14 +160,13 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		configFile = new File(torDirectory, "torrc");
 		doneFile = new File(torDirectory, "done");
 		cookieFile = new File(torDirectory, ".tor/control_auth_cookie");
-		Object o = appContext.getSystemService(POWER_SERVICE);
-		PowerManager pm = (PowerManager) o;
-		// This tag will prevent Huawei's powermanager from killing us.
-		wakeLock = pm.newWakeLock(PARTIAL_WAKE_LOCK, "LocationManagerService");
-		wakeLock.setReferenceCounted(false);
 		// Don't execute more than one connection status check at a time
 		connectionStatusExecutor = new PoliteExecutor("TorPlugin",
 				ioExecutor, 1);
+		PowerManager pm = (PowerManager)
+				appContext.getSystemService(POWER_SERVICE);
+		wakeLock = new RenewableWakeLock(pm, scheduler, PARTIAL_WAKE_LOCK,
+				WAKE_LOCK_TAG, 1, MINUTES);
 	}
 
 	@Override
@@ -190,18 +189,10 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		if (used.getAndSet(true)) throw new IllegalStateException();
 		// Install or update the assets if necessary
 		if (!assetsAreUpToDate()) installAssets();
-		LOG.info("Starting Tor");
-		// Watch for the auth cookie file being updated
-		try {
-			cookieFile.getParentFile().mkdirs();
-			cookieFile.createNewFile();
-		} catch (IOException e) {
-			throw new PluginException(e);
-		}
-		CountDownLatch latch = new CountDownLatch(1);
-		FileObserver obs = new WriteObserver(cookieFile, latch);
-		obs.startWatching();
+		if (cookieFile.exists() && !cookieFile.delete())
+			LOG.warning("Old auth cookie not deleted");
 		// Start a new Tor process
+		LOG.info("Starting Tor");
 		String torPath = torFile.getAbsolutePath();
 		String configPath = configFile.getAbsolutePath();
 		String pid = String.valueOf(android.os.Process.myPid());
@@ -240,11 +231,16 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 				throw new PluginException();
 			}
 			// Wait for the auth cookie file to be created/updated
-			if (!latch.await(COOKIE_TIMEOUT, MILLISECONDS)) {
-				LOG.warning("Auth cookie not created");
-				if (LOG.isLoggable(INFO)) listFiles(torDirectory);
-				throw new PluginException();
+			long start = clock.currentTimeMillis();
+			while (cookieFile.length() < 32) {
+				if (clock.currentTimeMillis() - start > COOKIE_TIMEOUT_MS) {
+					LOG.warning("Auth cookie not created");
+					if (LOG.isLoggable(INFO)) listFiles(torDirectory);
+					throw new PluginException();
+				}
+				Thread.sleep(COOKIE_POLLING_INTERVAL_MS);
 			}
+			LOG.info("Auth cookie created");
 		} catch (InterruptedException e) {
 			LOG.warning("Interrupted while starting Tor");
 			Thread.currentThread().interrupt();
@@ -338,7 +334,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		return zin;
 	}
 
-	private InputStream getConfigInputStream() throws IOException {
+	private InputStream getConfigInputStream() {
 		int resId = getResourceId("torrc");
 		return appContext.getResources().openRawResource(resId);
 	}
@@ -352,7 +348,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		try {
 			if (c != null) c.close();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -360,7 +356,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		try {
 			if (s != null) s.close();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -369,7 +365,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 			File[] children = f.listFiles();
 			if (children != null) for (File child : children) listFiles(child);
 		} else {
-			LOG.info(f.getAbsolutePath());
+			LOG.info(f.getAbsolutePath() + " " + f.length());
 		}
 	}
 
@@ -389,14 +385,6 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		}
 	}
 
-	private void sendDevReports() {
-		ioExecutor.execute(() -> {
-			// TODO: Trigger this with a TransportEnabledEvent
-			File reportDir = AndroidUtils.getReportDir(appContext);
-			reporter.sendReports(reportDir);
-		});
-	}
-
 	private void bind() {
 		ioExecutor.execute(() -> {
 			// If there's already a port number stored in config, reuse it
@@ -410,7 +398,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 				ss = new ServerSocket();
 				ss.bind(new InetSocketAddress("127.0.0.1", port));
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				tryToClose(ss);
 				return;
 			}
@@ -436,7 +424,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		try {
 			if (ss != null) ss.close();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		} finally {
 			callback.transportDisabled();
 		}
@@ -455,7 +443,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 				response = controlConnection.addOnion(portLines);
 			else response = controlConnection.addOnion(privKey, portLines);
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			return;
 		}
 		if (!response.containsKey(HS_ADDRESS)) {
@@ -511,7 +499,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	}
 
 	@Override
-	public void stop() throws PluginException {
+	public void stop() {
 		running = false;
 		tryToClose(socket);
 		if (networkStateReceiver != null)
@@ -523,7 +511,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 				controlConnection.shutdownTor("TERM");
 				controlSocket.close();
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 		wakeLock.release();
@@ -545,20 +533,16 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	}
 
 	@Override
-	public void poll(Collection<ContactId> connected) {
+	public void poll(Map<ContactId, TransportProperties> contacts) {
 		if (!isRunning()) return;
 		backoff.increment();
-		Map<ContactId, TransportProperties> remote =
-				callback.getRemoteProperties();
-		for (Entry<ContactId, TransportProperties> e : remote.entrySet()) {
-			ContactId c = e.getKey();
-			if (!connected.contains(c)) connectAndCallBack(c, e.getValue());
+		for (Entry<ContactId, TransportProperties> e : contacts.entrySet()) {
+			connectAndCallBack(e.getKey(), e.getValue());
 		}
 	}
 
 	private void connectAndCallBack(ContactId c, TransportProperties p) {
 		ioExecutor.execute(() -> {
-			if (!isRunning()) return;
 			DuplexTransportConnection d = createConnection(p);
 			if (d != null) {
 				backoff.reset();
@@ -568,13 +552,8 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	}
 
 	@Override
-	public DuplexTransportConnection createConnection(ContactId c) {
+	public DuplexTransportConnection createConnection(TransportProperties p) {
 		if (!isRunning()) return null;
-		return createConnection(callback.getRemoteProperties(c));
-	}
-
-	@Nullable
-	private DuplexTransportConnection createConnection(TransportProperties p) {
 		String onion = p.get(PROP_ONION);
 		if (StringUtils.isNullOrEmpty(onion)) return null;
 		if (!ONION.matcher(onion).matches()) {
@@ -624,10 +603,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 				connectionStatus.getAndSetCircuitBuilt()) {
 			LOG.info("First circuit built");
 			backoff.reset();
-			if (isRunning()) {
-				sendDevReports();
-				callback.transportEnabled();
-			}
+			if (isRunning()) callback.transportEnabled();
 		}
 	}
 
@@ -656,10 +632,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		if (severity.equals("NOTICE") && msg.startsWith("Bootstrapped 100%")) {
 			connectionStatus.setBootstrapped();
 			backoff.reset();
-			if (isRunning()) {
-				sendDevReports();
-				callback.transportEnabled();
-			}
+			if (isRunning()) callback.transportEnabled();
 		}
 	}
 
@@ -669,22 +642,6 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 			LOG.info("Descriptor uploaded");
 	}
 
-	private static class WriteObserver extends FileObserver {
-
-		private final CountDownLatch latch;
-
-		private WriteObserver(File file, CountDownLatch latch) {
-			super(file.getAbsolutePath(), CLOSE_WRITE);
-			this.latch = latch;
-		}
-
-		@Override
-		public void onEvent(int event, @Nullable String path) {
-			stopWatching();
-			latch.countDown();
-		}
-	}
-
 	@Override
 	public void eventOccurred(Event e) {
 		if (e instanceof SettingsUpdatedEvent) {
@@ -732,7 +689,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 					enableNetwork(true);
 				}
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}

bramble-android/src/main/java/org/briarproject/bramble/plugin/tor/TorPluginFactory.java

@@ -12,7 +12,7 @@ import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPluginCallback;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
-import org.briarproject.bramble.api.reporting.DevReporter;
+import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.api.system.LocationUtils;
 import org.briarproject.bramble.util.AndroidUtils;
 
@@ -40,24 +40,24 @@ public class TorPluginFactory implements DuplexPluginFactory {
 	private final ScheduledExecutorService scheduler;
 	private final Context appContext;
 	private final LocationUtils locationUtils;
-	private final DevReporter reporter;
 	private final EventBus eventBus;
 	private final SocketFactory torSocketFactory;
 	private final BackoffFactory backoffFactory;
+	private final Clock clock;
 
 	public TorPluginFactory(Executor ioExecutor,
 			ScheduledExecutorService scheduler, Context appContext,
-			LocationUtils locationUtils, DevReporter reporter,
-			EventBus eventBus, SocketFactory torSocketFactory,
-			BackoffFactory backoffFactory) {
+			LocationUtils locationUtils, EventBus eventBus,
+			SocketFactory torSocketFactory, BackoffFactory backoffFactory,
+			Clock clock) {
 		this.ioExecutor = ioExecutor;
 		this.scheduler = scheduler;
 		this.appContext = appContext;
 		this.locationUtils = locationUtils;
-		this.reporter = reporter;
 		this.eventBus = eventBus;
 		this.torSocketFactory = torSocketFactory;
 		this.backoffFactory = backoffFactory;
+		this.clock = clock;
 	}
 
 	@Override
@@ -94,7 +94,7 @@ public class TorPluginFactory implements DuplexPluginFactory {
 		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
 				MAX_POLLING_INTERVAL, BACKOFF_BASE);
 		TorPlugin plugin = new TorPlugin(ioExecutor, scheduler, appContext,
-				locationUtils, reporter, torSocketFactory, backoff, callback,
+				locationUtils, torSocketFactory, clock, backoff, callback,
 				architecture, MAX_LATENCY, MAX_IDLE_TIME);
 		eventBus.addListener(plugin);
 		return plugin;

bramble-android/src/main/java/org/briarproject/bramble/system/AndroidSecureRandomProvider.java

@@ -9,6 +9,7 @@ import android.net.wifi.WifiConfiguration;
 import android.net.wifi.WifiManager;
 import android.os.Build;
 import android.os.Parcel;
+import android.os.StrictMode;
 import android.provider.Settings;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
@@ -66,9 +67,12 @@ class AndroidSecureRandomProvider extends LinuxSecureRandomProvider {
 
 	@Override
 	protected void writeSeed() {
+		// Silence strict mode
+		StrictMode.ThreadPolicy tp = StrictMode.allowThreadDiskWrites();
 		super.writeSeed();
 		if (Build.VERSION.SDK_INT >= 16 && Build.VERSION.SDK_INT <= 18)
 			applyOpenSslFix();
+		StrictMode.setThreadPolicy(tp);
 	}
 
 	// Based on https://android-developers.googleblog.com/2013/08/some-securerandom-thoughts.html

bramble-android/src/main/java/org/briarproject/bramble/util/AndroidUtils.java

@@ -1,7 +1,9 @@
 package org.briarproject.bramble.util;
 
+import android.annotation.SuppressLint;
 import android.bluetooth.BluetoothAdapter;
 import android.content.Context;
+import android.content.SharedPreferences;
 import android.os.Build;
 import android.provider.Settings;
 
@@ -10,11 +12,15 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
+import java.util.logging.Logger;
 
 import static android.content.Context.MODE_PRIVATE;
 
 public class AndroidUtils {
 
+	private static final Logger LOG =
+			Logger.getLogger(AndroidUtils.class.getName());
+
 	// Fake Bluetooth address returned by BluetoothAdapter on API 23 and later
 	private static final String FAKE_BLUETOOTH_ADDRESS = "02:00:00:00:00:00";
 
@@ -35,6 +41,7 @@ public class AndroidUtils {
 	public static String getBluetoothAddress(Context ctx,
 			BluetoothAdapter adapter) {
 		// Return the adapter's address if it's valid and not fake
+		@SuppressLint("HardwareIds")
 		String address = adapter.getAddress();
 		if (isValidBluetoothAddress(address)) return address;
 		// Return the address from settings if it's valid and not fake
@@ -51,17 +58,28 @@ public class AndroidUtils {
 				&& !address.equals(FAKE_BLUETOOTH_ADDRESS);
 	}
 
-	public static void deleteAppData(Context ctx) {
+	public static void deleteAppData(Context ctx, SharedPreferences... clear) {
+		// Clear and commit shared preferences
+		for (SharedPreferences prefs : clear) {
+			if (!prefs.edit().clear().commit())
+				LOG.warning("Could not clear shared preferences");
+		}
+		// Delete files, except lib and shared_prefs directories
 		File dataDir = new File(ctx.getApplicationInfo().dataDir);
 		File[] children = dataDir.listFiles();
-		if (children != null) {
+		if (children == null) {
+			LOG.warning("Could not list files in app data dir");
+		} else {
 			for (File child : children) {
-				if (!child.getName().equals("lib"))
+				String name = child.getName();
+				if (!name.equals("lib") && !name.equals("shared_prefs")) {
 					IoUtils.deleteFileOrDir(child);
+				}
 			}
 		}
 		// Recreate the cache dir as some OpenGL drivers expect it to exist
-		new File(dataDir, "cache").mkdir();
+		if (!new File(dataDir, "cache").mkdir())
+			LOG.warning("Could not recreate cache dir");
 	}
 
 	public static File getReportDir(Context ctx) {

bramble-android/src/main/java/org/briarproject/bramble/util/RenewableWakeLock.java

@@ -0,0 +1,100 @@
+package org.briarproject.bramble.util;
+
+import android.os.PowerManager;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ScheduledFuture;
+import java.util.concurrent.TimeUnit;
+import java.util.logging.Logger;
+
+import javax.annotation.Nullable;
+import javax.annotation.concurrent.ThreadSafe;
+
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
+import static java.util.logging.Level.INFO;
+
+@ThreadSafe
+@NotNullByDefault
+public class RenewableWakeLock {
+
+	private static final Logger LOG =
+			Logger.getLogger(RenewableWakeLock.class.getName());
+
+	/**
+	 * Automatically release the lock this many milliseconds after it's due
+	 * to have been replaced and released.
+	 */
+	private static final int SAFETY_MARGIN_MS = 10_000;
+
+	private final PowerManager powerManager;
+	private final ScheduledExecutorService scheduler;
+	private final int levelAndFlags;
+	private final String tag;
+	private final long durationMs;
+	private final Runnable renewTask;
+
+	private final Object lock = new Object();
+	@Nullable
+	private PowerManager.WakeLock wakeLock; // Locking: lock
+	@Nullable
+	private ScheduledFuture future; // Locking: lock
+
+	public RenewableWakeLock(PowerManager powerManager,
+			ScheduledExecutorService scheduler, int levelAndFlags, String tag,
+			long duration, TimeUnit timeUnit) {
+		this.powerManager = powerManager;
+		this.scheduler = scheduler;
+		this.levelAndFlags = levelAndFlags;
+		this.tag = tag;
+		durationMs = MILLISECONDS.convert(duration, timeUnit);
+		renewTask = this::renew;
+	}
+
+	public void acquire() {
+		if (LOG.isLoggable(INFO)) LOG.info("Acquiring wake lock " + tag);
+		synchronized (lock) {
+			if (wakeLock != null) {
+				LOG.info("Already acquired");
+				return;
+			}
+			wakeLock = powerManager.newWakeLock(levelAndFlags, tag);
+			wakeLock.setReferenceCounted(false);
+			wakeLock.acquire(durationMs + SAFETY_MARGIN_MS);
+			future = scheduler.schedule(renewTask, durationMs, MILLISECONDS);
+		}
+	}
+
+	private void renew() {
+		if (LOG.isLoggable(INFO)) LOG.info("Renewing wake lock " + tag);
+		synchronized (lock) {
+			if (wakeLock == null) {
+				LOG.info("Already released");
+				return;
+			}
+			PowerManager.WakeLock oldWakeLock = wakeLock;
+			wakeLock = powerManager.newWakeLock(levelAndFlags, tag);
+			wakeLock.setReferenceCounted(false);
+			wakeLock.acquire(durationMs + SAFETY_MARGIN_MS);
+			oldWakeLock.release();
+			future = scheduler.schedule(renewTask, durationMs, MILLISECONDS);
+		}
+	}
+
+	public void release() {
+		if (LOG.isLoggable(INFO)) LOG.info("Releasing wake lock " + tag);
+		synchronized (lock) {
+			if (wakeLock == null) {
+				LOG.info("Already released");
+				return;
+			}
+			if (future == null) throw new AssertionError();
+			future.cancel(false);
+			future = null;
+			wakeLock.release();
+			wakeLock = null;
+		}
+	}
+}
+

bramble-api/build.gradle

@@ -2,6 +2,7 @@ apply plugin: 'java-library'
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
 
+apply plugin: 'ru.vyarus.animalsniffer'
 apply plugin: 'witness'
 
 dependencies {
@@ -14,6 +15,8 @@ dependencies {
 	testImplementation "org.jmock:jmock-legacy:2.8.2"
 	testImplementation "org.hamcrest:hamcrest-library:1.3"
 	testImplementation "org.hamcrest:hamcrest-core:1.3"
+
+	signature 'org.codehaus.mojo.signature:java16:1.1@signature'
 }
 
 dependencyVerification {
@@ -26,6 +29,9 @@ dependencyVerification {
 			'org.apache.ant:ant-launcher:1.9.4:ant-launcher-1.9.4.jar:7bccea20b41801ca17bcbc909a78c835d0f443f12d639c77bd6ae3d05861608d',
 			'org.apache.ant:ant:1.9.4:ant-1.9.4.jar:649ae0730251de07b8913f49286d46bba7b92d47c5f332610aa426c4f02161d8',
 			'org.beanshell:bsh:1.3.0:bsh-1.3.0.jar:9b04edc75d19db54f1b4e8b5355e9364384c6cf71eb0a1b9724c159d779879f8',
+			'org.codehaus.mojo.signature:java16:1.1:java16-1.1.signature:53799223a2c98dba2d0add810bed76315460df285c69e4f397ae6098f87dd619',
+			'org.codehaus.mojo:animal-sniffer-ant-tasks:1.16:animal-sniffer-ant-tasks-1.16.jar:890040976fbe2d584619a6a61b1fd2e925b3b5eb342a85eb2762c467c0d64e90',
+			'org.codehaus.mojo:animal-sniffer:1.16:animal-sniffer-1.16.jar:72be8bcc226ba43b937c722a08a07852bfa1b11400089265d5df0ee7b38b1d52',
 			'org.hamcrest:hamcrest-core:1.3:hamcrest-core-1.3.jar:66fdef91e9739348df7a096aa384a5685f4e875584cce89386a7a47251c4d8e9',
 			'org.hamcrest:hamcrest-library:1.3:hamcrest-library-1.3.jar:711d64522f9ec410983bd310934296da134be4254a125080a0416ec178dfad1c',
 			'org.jmock:jmock-junit4:2.8.2:jmock-junit4-2.8.2.jar:f7ee4df4f7bd7b7f1cafad3b99eb74d579f109d5992ff625347352edb55e674c',
@@ -33,6 +39,7 @@ dependencyVerification {
 			'org.jmock:jmock-testjar:2.8.2:jmock-testjar-2.8.2.jar:8900860f72c474e027cf97fe78dcbf154a1aa7fc62b6845c5fb4e4f3c7bc8760',
 			'org.jmock:jmock:2.8.2:jmock-2.8.2.jar:6c73cb4a2e6dbfb61fd99c9a768539c170ab6568e57846bd60dbf19596b65b16',
 			'org.objenesis:objenesis:2.1:objenesis-2.1.jar:c74330cc6b806c804fd37e74487b4fe5d7c2750c5e15fbc6efa13bdee1bdef80',
+			'org.ow2.asm:asm-all:5.2:asm-all-5.2.jar:7fbffbc1db3422e2101689fd88df8384b15817b52b9b2b267b9f6d2511dc198d',
 			'org.ow2.asm:asm:5.0.4:asm-5.0.4.jar:896618ed8ae62702521a78bc7be42b7c491a08e6920a15f89a3ecdec31e9a220',
 	]
 }
@@ -48,8 +55,3 @@ task jarTest(type: Jar, dependsOn: testClasses) {
 artifacts {
 	testOutput jarTest
 }
-
-// If a Java 6 JRE is available, check we're not using any Java 7 or 8 APIs
-tasks.withType(JavaCompile) {
-	useJava6StandardLibrary(it)
-}

bramble-api/src/main/java/org/briarproject/bramble/api/contact/ContactManager.java

@@ -45,9 +45,9 @@ public interface ContactManager {
 	 *
 	 * @param alice true if the local party is Alice
 	 */
-	ContactId addContact(Author remote, AuthorId local,
-			SecretKey master, long timestamp, boolean alice, boolean verified,
-			boolean active) throws DbException;
+	ContactId addContact(Author remote, AuthorId local, SecretKey master,
+			long timestamp, boolean alice, boolean verified, boolean active)
+			throws DbException;
 
 	/**
 	 * Returns the contact with the given ID.

bramble-api/src/main/java/org/briarproject/bramble/api/crypto/KeyPair.java

@@ -5,7 +5,7 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import javax.annotation.concurrent.Immutable;
 
 /**
- * A key pair consisting of a {@link PublicKey} and a {@link PrivateKey).
+ * A key pair consisting of a {@link PublicKey} and a {@link PrivateKey}.
  */
 @Immutable
 @NotNullByDefault

bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfReader.java

@@ -8,6 +8,7 @@ import java.io.IOException;
 public interface BdfReader {
 
 	int DEFAULT_NESTED_LIMIT = 5;
+	int DEFAULT_MAX_BUFFER_SIZE = 64 * 1024;
 
 	boolean eof() throws IOException;
 
@@ -39,13 +40,13 @@ public interface BdfReader {
 
 	boolean hasString() throws IOException;
 
-	String readString(int maxLength) throws IOException;
+	String readString() throws IOException;
 
 	void skipString() throws IOException;
 
 	boolean hasRaw() throws IOException;
 
-	byte[] readRaw(int maxLength) throws IOException;
+	byte[] readRaw() throws IOException;
 
 	void skipRaw() throws IOException;
 

bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfReaderFactory.java

@@ -9,5 +9,6 @@ public interface BdfReaderFactory {
 
 	BdfReader createReader(InputStream in);
 
-	BdfReader createReader(InputStream in, int nestedLimit);
+	BdfReader createReader(InputStream in, int nestedLimit,
+			int maxBufferSize);
 }

bramble-api/src/main/java/org/briarproject/bramble/api/db/DatabaseComponent.java

@@ -104,18 +104,12 @@ public interface DatabaseComponent {
 			throws DbException;
 
 	/**
-	 * Stores the given transport keys, optionally binding them to the given
-	 * contact, and returns a key set ID.
+	 * Stores the given transport keys for the given contact and returns a
+	 * key set ID.
 	 */
-	KeySetId addTransportKeys(Transaction txn, @Nullable ContactId c,
+	KeySetId addTransportKeys(Transaction txn, ContactId c,
 			TransportKeys k) throws DbException;
 
-	/**
-	 * Binds the given keys for the given transport to the given contact.
-	 */
-	void bindTransportKeys(Transaction txn, ContactId c, TransportId t,
-			KeySetId k) throws DbException;
-
 	/**
 	 * Returns true if the database contains the given contact for the given
 	 * local pseudonym.

bramble-api/src/main/java/org/briarproject/bramble/api/db/DatabaseConfig.java

@@ -14,6 +14,8 @@ public interface DatabaseConfig {
 
 	File getDatabaseDirectory();
 
+	File getDatabaseKeyDirectory();
+
 	void setEncryptionKey(SecretKey key);
 
 	@Nullable

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/FileConstants.java

@@ -0,0 +1,6 @@
+package org.briarproject.bramble.api.plugin;
+
+public interface FileConstants {
+
+	String PROP_PATH = "path";
+}

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/Plugin.java

@@ -2,8 +2,9 @@ package org.briarproject.bramble.api.plugin;
 
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.properties.TransportProperties;
 
-import java.util.Collection;
+import java.util.Map;
 
 @NotNullByDefault
 public interface Plugin {
@@ -39,21 +40,19 @@ public interface Plugin {
 	boolean isRunning();
 
 	/**
-	 * Returns true if the plugin's {@link #poll(Collection)} method should be
-	 * called periodically to attempt to establish connections.
+	 * Returns true if the plugin should be polled periodically to attempt to
+	 * establish connections.
 	 */
 	boolean shouldPoll();
 
 	/**
-	 * Returns the desired interval in milliseconds between calls to the
-	 * plugin's {@link #poll(Collection)} method.
+	 * Returns the desired interval in milliseconds between polling attempts.
 	 */
 	int getPollingInterval();
 
 	/**
-	 * Attempts to establish connections to contacts, passing any created
-	 * connections to the callback. To avoid creating redundant connections,
-	 * the plugin may exclude the given contacts from polling.
+	 * Attempts to establish connections to the given contacts, passing any
+	 * created connections to the callback.
 	 */
-	void poll(Collection<ContactId> connected);
+	void poll(Map<ContactId, TransportProperties> contacts);
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/PluginCallback.java

@@ -1,12 +1,9 @@
 package org.briarproject.bramble.api.plugin;
 
-import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.settings.Settings;
 
-import java.util.Map;
-
 /**
  * An interface through which a transport plugin interacts with the rest of
  * the application.
@@ -25,17 +22,7 @@ public interface PluginCallback {
 	TransportProperties getLocalProperties();
 
 	/**
-	 * Returns the plugin's remote transport properties.
-	 */
-	Map<ContactId, TransportProperties> getRemoteProperties();
-
-	/**
-	 * Returns the plugin's remote transport properties for the given contact.
-	 */
-	TransportProperties getRemoteProperties(ContactId c);
-
-	/**
-	 * Merges the given settings with the namespaced settings
+	 * Merges the given settings with the plugin's settings
 	 */
 	void mergeSettings(Settings s);
 
@@ -45,34 +32,12 @@ public interface PluginCallback {
 	void mergeLocalProperties(TransportProperties p);
 
 	/**
-	 * Presents the user with a choice among two or more named options and
-	 * returns the user's response. The message may consist of a translatable
-	 * format string and arguments.
-	 *
-	 * @return an index into the array of options indicating the user's choice,
-	 * or -1 if the user cancelled the choice.
-	 */
-	int showChoice(String[] options, String... message);
-
-	/**
-	 * Asks the user to confirm an action and returns the user's response. The
-	 * message may consist of a translatable format string and arguments.
-	 */
-	boolean showConfirmationMessage(String... message);
-
-	/**
-	 * Shows a message to the user. The message may consist of a translatable
-	 * format string and arguments.
-	 */
-	void showMessage(String... message);
-
-	/**
-	 * Signal that the transport got enabled.
+	 * Signals that the transport is enabled.
 	 */
 	void transportEnabled();
 
 	/**
-	 * Signal that the transport got disabled.
+	 * Signals that the transport is disabled.
 	 */
 	void transportDisabled();
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/PluginConfig.java

@@ -12,4 +12,6 @@ public interface PluginConfig {
 	Collection<DuplexPluginFactory> getDuplexFactories();
 
 	Collection<SimplexPluginFactory> getSimplexFactories();
+
+	boolean shouldPoll();
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/TransportConnectionWriter.java

@@ -22,11 +22,6 @@ public interface TransportConnectionWriter {
 	 */
 	int getMaxIdleTime();
 
-	/**
-	 * Returns the capacity of the transport connection in bytes.
-	 */
-	long getCapacity();
-
 	/**
 	 * Returns an output stream for writing to the transport connection.
 	 */

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/duplex/AbstractDuplexTransportConnection.java

@@ -71,11 +71,6 @@ public abstract class AbstractDuplexTransportConnection
 			return plugin.getMaxIdleTime();
 		}
 
-		@Override
-		public long getCapacity() {
-			return Long.MAX_VALUE;
-		}
-
 		@Override
 		public OutputStream getOutputStream() throws IOException {
 			return AbstractDuplexTransportConnection.this.getOutputStream();

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/duplex/DuplexPlugin.java

@@ -1,10 +1,10 @@
 package org.briarproject.bramble.api.plugin.duplex;
 
-import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.data.BdfList;
 import org.briarproject.bramble.api.keyagreement.KeyAgreementListener;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.Plugin;
+import org.briarproject.bramble.api.properties.TransportProperties;
 
 import javax.annotation.Nullable;
 
@@ -15,12 +15,11 @@ import javax.annotation.Nullable;
 public interface DuplexPlugin extends Plugin {
 
 	/**
-	 * Attempts to create and return a connection to the given contact using
-	 * the current transport and configuration properties. Returns null if a
-	 * connection cannot be created.
+	 * Attempts to create and return a connection using the given transport
+	 * properties. Returns null if a connection cannot be created.
 	 */
 	@Nullable
-	DuplexTransportConnection createConnection(ContactId c);
+	DuplexTransportConnection createConnection(TransportProperties p);
 
 	/**
 	 * Returns true if the plugin supports short-range key agreement.

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/duplex/DuplexPluginCallback.java

@@ -5,7 +5,8 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.PluginCallback;
 
 /**
- * An interface for handling connections created by a duplex transport plugin.
+ * An interface through which a duplex plugin interacts with the rest of the
+ * application.
  */
 @NotNullByDefault
 public interface DuplexPluginCallback extends PluginCallback {

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/simplex/SimplexPlugin.java

@@ -1,10 +1,10 @@
 package org.briarproject.bramble.api.plugin.simplex;
 
-import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.Plugin;
 import org.briarproject.bramble.api.plugin.TransportConnectionReader;
 import org.briarproject.bramble.api.plugin.TransportConnectionWriter;
+import org.briarproject.bramble.api.properties.TransportProperties;
 
 import javax.annotation.Nullable;
 
@@ -15,18 +15,16 @@ import javax.annotation.Nullable;
 public interface SimplexPlugin extends Plugin {
 
 	/**
-	 * Attempts to create and return a reader for the given contact using the
-	 * current transport and configuration properties. Returns null if a reader
-	 * cannot be created.
+	 * Attempts to create and return a reader for the given transport
+	 * properties. Returns null if a reader cannot be created.
 	 */
 	@Nullable
-	TransportConnectionReader createReader(ContactId c);
+	TransportConnectionReader createReader(TransportProperties p);
 
 	/**
-	 * Attempts to create and return a writer for the given contact using the
-	 * current transport and configuration properties. Returns null if a writer
-	 * cannot be created.
+	 * Attempts to create and return a writer for the given transport
+	 * properties. Returns null if a writer cannot be created.
 	 */
 	@Nullable
-	TransportConnectionWriter createWriter(ContactId c);
+	TransportConnectionWriter createWriter(TransportProperties p);
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/simplex/SimplexPluginCallback.java

@@ -7,8 +7,8 @@ import org.briarproject.bramble.api.plugin.TransportConnectionReader;
 import org.briarproject.bramble.api.plugin.TransportConnectionWriter;
 
 /**
- * An interface for handling readers and writers created by a simplex transport
- * plugin.
+ * An interface through which a simplex plugin interacts with the rest of the
+ * application.
  */
 @NotNullByDefault
 public interface SimplexPluginCallback extends PluginCallback {

bramble-api/src/main/java/org/briarproject/bramble/api/reporting/DevConfig.java

@@ -3,10 +3,14 @@ package org.briarproject.bramble.api.reporting;
 import org.briarproject.bramble.api.crypto.PublicKey;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
+import java.io.File;
+
 @NotNullByDefault
 public interface DevConfig {
 
 	PublicKey getDevPublicKey();
 
 	String getDevOnionAddress();
+
+	File getReportDir();
 }

bramble-api/src/main/java/org/briarproject/bramble/api/reporting/DevReporter.java

@@ -23,8 +23,6 @@ public interface DevReporter {
 
 	/**
 	 * Sends any reports previously stored on disk.
-	 *
-	 * @param reportDir the directory where reports are stored.
 	 */
-	void sendReports(File reportDir);
+	void sendReports();
 }

bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncSessionFactory.java

@@ -2,9 +2,9 @@ package org.briarproject.bramble.api.sync;
 
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.transport.StreamWriter;
 
 import java.io.InputStream;
-import java.io.OutputStream;
 
 @NotNullByDefault
 public interface SyncSessionFactory {
@@ -12,8 +12,8 @@ public interface SyncSessionFactory {
 	SyncSession createIncomingSession(ContactId c, InputStream in);
 
 	SyncSession createSimplexOutgoingSession(ContactId c, int maxLatency,
-			OutputStream out);
+			StreamWriter streamWriter);
 
 	SyncSession createDuplexOutgoingSession(ContactId c, int maxLatency,
-			int maxIdleTime, OutputStream out);
+			int maxIdleTime, StreamWriter streamWriter);
 }

bramble-api/src/main/java/org/briarproject/bramble/api/system/Clock.java

@@ -7,12 +7,12 @@ package org.briarproject.bramble.api.system;
 public interface Clock {
 
 	/**
-	 * @see {@link System#currentTimeMillis()}
+	 * @see System#currentTimeMillis()
 	 */
 	long currentTimeMillis();
 
 	/**
-	 * @see {@link Thread#sleep(long)}
+	 * @see Thread#sleep(long)
 	 */
 	void sleep(long milliseconds) throws InterruptedException;
 }

bramble-api/src/main/java/org/briarproject/bramble/api/transport/KeyManager.java

@@ -19,48 +19,24 @@ public interface KeyManager {
 	/**
 	 * Informs the key manager that a new contact has been added. Derives and
 	 * stores a set of transport keys for communicating with the contact over
-	 * each transport.
+	 * each transport and returns the key set IDs.
 	 * <p/>
 	 * {@link StreamContext StreamContexts} for the contact can be created
 	 * after this method has returned.
 	 *
 	 * @param alice true if the local party is Alice
+	 * @param active whether the derived keys can be used for outgoing streams
 	 */
-	void addContact(Transaction txn, ContactId c, SecretKey master,
-			long timestamp, boolean alice) throws DbException;
-
-	/**
-	 * Derives and stores a set of unbound transport keys for each transport
-	 * and returns the key set IDs.
-	 * <p/>
-	 * The keys must be bound before they can be used for incoming streams,
-	 * and also activated before they can be used for outgoing streams.
-	 *
-	 * @param alice true if the local party is Alice
-	 */
-	Map<TransportId, KeySetId> addUnboundKeys(Transaction txn, SecretKey master,
-			long timestamp, boolean alice) throws DbException;
-
-	/**
-	 * Binds the given transport keys to the given contact.
-	 */
-	void bindKeys(Transaction txn, ContactId c, Map<TransportId, KeySetId> keys)
+	Map<TransportId, KeySetId> addContact(Transaction txn, ContactId c,
+			SecretKey master, long timestamp, boolean alice, boolean active)
 			throws DbException;
 
 	/**
-	 * Marks the given transport keys as usable for outgoing streams. Keys must
-	 * be bound before they are activated.
+	 * Marks the given transport keys as usable for outgoing streams.
 	 */
 	void activateKeys(Transaction txn, Map<TransportId, KeySetId> keys)
 			throws DbException;
 
-	/**
-	 * Removes the given transport keys, which must not have been bound, from
-	 * the manager and the database.
-	 */
-	void removeKeys(Transaction txn, Map<TransportId, KeySetId> keys)
-			throws DbException;
-
 	/**
 	 * Returns true if we have keys that can be used for outgoing streams to
 	 * the given contact over the given transport.

bramble-api/src/main/java/org/briarproject/bramble/api/transport/KeySet.java

@@ -3,23 +3,20 @@ package org.briarproject.bramble.api.transport;
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
-import javax.annotation.Nullable;
 import javax.annotation.concurrent.Immutable;
 
 /**
- * A set of transport keys for communicating with a contact. If the keys have
- * not yet been bound to a contact, {@link #getContactId()}} returns null.
+ * A set of transport keys for communicating with a contact.
  */
 @Immutable
 @NotNullByDefault
 public class KeySet {
 
 	private final KeySetId keySetId;
-	@Nullable
 	private final ContactId contactId;
 	private final TransportKeys transportKeys;
 
-	public KeySet(KeySetId keySetId, @Nullable ContactId contactId,
+	public KeySet(KeySetId keySetId, ContactId contactId,
 			TransportKeys transportKeys) {
 		this.keySetId = keySetId;
 		this.contactId = contactId;
@@ -30,7 +27,6 @@ public class KeySet {
 		return keySetId;
 	}
 
-	@Nullable
 	public ContactId getContactId() {
 		return contactId;
 	}

bramble-api/src/main/java/org/briarproject/bramble/api/transport/StreamWriter.java

@@ -0,0 +1,19 @@
+package org.briarproject.bramble.api.transport;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+/**
+ * An interface for writing data to a transport connection. Data will be
+ * encrypted and authenticated before being written to the connection.
+ */
+public interface StreamWriter {
+
+	OutputStream getOutputStream();
+
+	/**
+	 * Sends the end of stream marker, informing the recipient that no more
+	 * data will be sent. The connection is flushed but not closed.
+	 */
+	void sendEndOfStream() throws IOException;
+}

bramble-api/src/main/java/org/briarproject/bramble/api/transport/StreamWriterFactory.java

@@ -12,12 +12,12 @@ public interface StreamWriterFactory {
 	 * Creates an {@link OutputStream OutputStream} for writing to a
 	 * transport stream
 	 */
-	OutputStream createStreamWriter(OutputStream out, StreamContext ctx);
+	StreamWriter createStreamWriter(OutputStream out, StreamContext ctx);
 
 	/**
 	 * Creates an {@link OutputStream OutputStream} for writing to a contact
 	 * exchange stream.
 	 */
-	OutputStream createContactExchangeStreamWriter(OutputStream out,
+	StreamWriter createContactExchangeStreamWriter(OutputStream out,
 			SecretKey headerKey);
 }

bramble-api/src/main/java/org/briarproject/bramble/api/ui/UiCallback.java

@@ -1,26 +0,0 @@
-package org.briarproject.bramble.api.ui;
-
-public interface UiCallback {
-
-	/**
-	 * Presents the user with a choice among two or more named options and
-	 * returns the user's response. The message may consist of a translatable
-	 * format string and arguments.
-	 *
-	 * @return an index into the array of options indicating the user's choice,
-	 * or -1 if the user cancelled the choice.
-	 */
-	int showChoice(String[] options, String... message);
-
-	/**
-	 * Asks the user to confirm an action and returns the user's response. The
-	 * message may consist of a translatable format string and arguments.
-	 */
-	boolean showConfirmationMessage(String... message);
-
-	/**
-	 * Shows a message to the user. The message may consist of a translatable
-	 * format string and arguments.
-	 */
-	void showMessage(String... message);
-}

bramble-api/src/main/java/org/briarproject/bramble/util/IoUtils.java

@@ -9,25 +9,40 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.net.Socket;
+import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
 
+import static java.util.logging.Level.WARNING;
+
 @NotNullByDefault
 public class IoUtils {
 
+	private static final Logger LOG = Logger.getLogger(IoUtils.class.getName());
+
 	public static void deleteFileOrDir(File f) {
 		if (f.isFile()) {
-			f.delete();
+			delete(f);
 		} else if (f.isDirectory()) {
 			File[] children = f.listFiles();
-			if (children != null)
+			if (children == null) {
+				if (LOG.isLoggable(WARNING)) {
+					LOG.warning("Could not list files in "
+							+ f.getAbsolutePath());
+				}
+			} else {
 				for (File child : children) deleteFileOrDir(child);
-			f.delete();
+			}
+			delete(f);
 		}
 	}
 
-	public static void copyAndClose(InputStream in, OutputStream out)
-			throws IOException {
+	private static void delete(File f) {
+		if (!f.delete() && LOG.isLoggable(WARNING))
+			LOG.warning("Could not delete " + f.getAbsolutePath());
+	}
+
+	public static void copyAndClose(InputStream in, OutputStream out) {
 		byte[] buf = new byte[4096];
 		try {
 			while (true) {

bramble-api/src/main/java/org/briarproject/bramble/util/LogUtils.java

@@ -0,0 +1,36 @@
+package org.briarproject.bramble.util;
+
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import static java.util.logging.Level.FINE;
+
+public class LogUtils {
+
+	private static final int NANOS_PER_MILLI = 1000 * 1000;
+
+	/**
+	 * Returns the elapsed time in milliseconds since some arbitrary
+	 * starting time. This is only useful for measuring elapsed time.
+	 */
+	public static long now() {
+		return System.nanoTime() / NANOS_PER_MILLI;
+	}
+
+	/**
+	 * Logs the duration of a task.
+	 * @param logger the logger to use
+	 * @param task a description of the task
+	 * @param start the start time of the task, as returned by {@link #now()}
+	 */
+	public static void logDuration(Logger logger, String task, long start) {
+		if (logger.isLoggable(FINE)) {
+			long duration = now() - start;
+			logger.fine(task + " took " + duration + " ms");
+		}
+	}
+
+	public static void logException(Logger logger, Level level, Throwable t) {
+		if (logger.isLoggable(level)) logger.log(level, t.toString(), t);
+	}
+}

bramble-api/src/main/java/org/briarproject/bramble/util/OsUtils.java

@@ -22,19 +22,6 @@ public class OsUtils {
 		return os != null && os.contains("Mac OS");
 	}
 
-	public static boolean isMacLeopardOrNewer() {
-		if (!isMac() || version == null) return false;
-		try {
-			String[] v = version.split("\\.");
-			if (v.length != 3) return false;
-			int major = Integer.parseInt(v[0]);
-			int minor = Integer.parseInt(v[1]);
-			return major >= 10 && minor >= 5;
-		} catch (NumberFormatException e) {
-			return false;
-		}
-	}
-
 	public static boolean isLinux() {
 		return os != null && os.contains("Linux") && !isAndroid();
 	}

bramble-core/build.gradle

@@ -2,6 +2,7 @@ apply plugin: 'java-library'
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
 
+apply plugin: 'ru.vyarus.animalsniffer'
 apply plugin: 'net.ltgt.apt'
 apply plugin: 'idea'
 apply plugin: 'witness'
@@ -26,6 +27,8 @@ dependencies {
 	testImplementation "org.hamcrest:hamcrest-core:1.3"
 
 	testApt 'com.google.dagger:dagger-compiler:2.0.2'
+
+	signature 'org.codehaus.mojo.signature:java16:1.1@signature'
 }
 
 dependencyVerification {
@@ -44,6 +47,9 @@ dependencyVerification {
 			'org.apache.ant:ant:1.9.4:ant-1.9.4.jar:649ae0730251de07b8913f49286d46bba7b92d47c5f332610aa426c4f02161d8',
 			'org.beanshell:bsh:1.3.0:bsh-1.3.0.jar:9b04edc75d19db54f1b4e8b5355e9364384c6cf71eb0a1b9724c159d779879f8',
 			'org.bitlet:weupnp:0.1.4:weupnp-0.1.4.jar:88df7e6504929d00bdb832863761385c68ab92af945b04f0770b126270a444fb',
+			'org.codehaus.mojo.signature:java16:1.1:java16-1.1.signature:53799223a2c98dba2d0add810bed76315460df285c69e4f397ae6098f87dd619',
+			'org.codehaus.mojo:animal-sniffer-ant-tasks:1.16:animal-sniffer-ant-tasks-1.16.jar:890040976fbe2d584619a6a61b1fd2e925b3b5eb342a85eb2762c467c0d64e90',
+			'org.codehaus.mojo:animal-sniffer:1.16:animal-sniffer-1.16.jar:72be8bcc226ba43b937c722a08a07852bfa1b11400089265d5df0ee7b38b1d52',
 			'org.hamcrest:hamcrest-core:1.3:hamcrest-core-1.3.jar:66fdef91e9739348df7a096aa384a5685f4e875584cce89386a7a47251c4d8e9',
 			'org.hamcrest:hamcrest-library:1.3:hamcrest-library-1.3.jar:711d64522f9ec410983bd310934296da134be4254a125080a0416ec178dfad1c',
 			'org.hsqldb:hsqldb:2.3.5:hsqldb-2.3.5.jar:6676a6977ac98997a80f827ddbd3fe8ca1e0853dad1492512135fd1a222ccfad',
@@ -52,6 +58,7 @@ dependencyVerification {
 			'org.jmock:jmock-testjar:2.8.2:jmock-testjar-2.8.2.jar:8900860f72c474e027cf97fe78dcbf154a1aa7fc62b6845c5fb4e4f3c7bc8760',
 			'org.jmock:jmock:2.8.2:jmock-2.8.2.jar:6c73cb4a2e6dbfb61fd99c9a768539c170ab6568e57846bd60dbf19596b65b16',
 			'org.objenesis:objenesis:2.1:objenesis-2.1.jar:c74330cc6b806c804fd37e74487b4fe5d7c2750c5e15fbc6efa13bdee1bdef80',
+			'org.ow2.asm:asm-all:5.2:asm-all-5.2.jar:7fbffbc1db3422e2101689fd88df8384b15817b52b9b2b267b9f6d2511dc198d',
 			'org.ow2.asm:asm:5.0.4:asm-5.0.4.jar:896618ed8ae62702521a78bc7be42b7c491a08e6920a15f89a3ecdec31e9a220',
 			'org.whispersystems:curve25519-java:0.4.1:curve25519-java-0.4.1.jar:7dd659d8822c06c3aea1a47f18fac9e5761e29cab8100030b877db445005f03e',
 	]
@@ -68,8 +75,3 @@ task jarTest(type: Jar, dependsOn: testClasses) {
 artifacts {
 	testOutput jarTest
 }
-
-// If a Java 6 JRE is available, check we're not using any Java 7 or 8 APIs
-tasks.withType(JavaCompile) {
-	useJava6StandardLibrary(it)
-}

bramble-core/src/main/java/org/briarproject/bramble/BrambleCoreEagerSingletons.java

@@ -7,6 +7,7 @@ import org.briarproject.bramble.identity.IdentityModule;
 import org.briarproject.bramble.lifecycle.LifecycleModule;
 import org.briarproject.bramble.plugin.PluginModule;
 import org.briarproject.bramble.properties.PropertiesModule;
+import org.briarproject.bramble.reporting.ReportingModule;
 import org.briarproject.bramble.sync.SyncModule;
 import org.briarproject.bramble.system.SystemModule;
 import org.briarproject.bramble.transport.TransportModule;
@@ -28,6 +29,8 @@ public interface BrambleCoreEagerSingletons {
 
 	void inject(PropertiesModule.EagerSingletons init);
 
+	void inject(ReportingModule.EagerSingletons init);
+
 	void inject(SyncModule.EagerSingletons init);
 
 	void inject(SystemModule.EagerSingletons init);

bramble-core/src/main/java/org/briarproject/bramble/BrambleCoreModule.java

@@ -59,6 +59,7 @@ public class BrambleCoreModule {
 		c.inject(new LifecycleModule.EagerSingletons());
 		c.inject(new PluginModule.EagerSingletons());
 		c.inject(new PropertiesModule.EagerSingletons());
+		c.inject(new ReportingModule.EagerSingletons());
 		c.inject(new SyncModule.EagerSingletons());
 		c.inject(new SystemModule.EagerSingletons());
 		c.inject(new TransportModule.EagerSingletons());

bramble-core/src/main/java/org/briarproject/bramble/PoliteExecutor.java

@@ -5,12 +5,12 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import java.util.LinkedList;
 import java.util.Queue;
 import java.util.concurrent.Executor;
-import java.util.logging.Level;
 import java.util.logging.Logger;
 
 import javax.annotation.concurrent.GuardedBy;
 
 import static java.util.logging.Level.FINE;
+import static org.briarproject.bramble.util.LogUtils.now;
 
 /**
  * An {@link Executor} that delegates its tasks to another {@link Executor}
@@ -20,8 +20,6 @@ import static java.util.logging.Level.FINE;
 @NotNullByDefault
 public class PoliteExecutor implements Executor {
 
-	private static final Level LOG_LEVEL = FINE;
-
 	private final Object lock = new Object();
 	@GuardedBy("lock")
 	private final Queue<Runnable> queue = new LinkedList<>();
@@ -49,11 +47,11 @@ public class PoliteExecutor implements Executor {
 
 	@Override
 	public void execute(Runnable r) {
-		long submitted = System.currentTimeMillis();
+		long submitted = now();
 		Runnable wrapped = () -> {
-			if (log.isLoggable(LOG_LEVEL)) {
-				long queued = System.currentTimeMillis() - submitted;
-				log.log(LOG_LEVEL, "Queue time " + queued + " ms");
+			if (log.isLoggable(FINE)) {
+				long queued = now() - submitted;
+				log.fine("Queue time " + queued + " ms");
 			}
 			try {
 				r.run();

bramble-core/src/main/java/org/briarproject/bramble/TimeLoggingExecutor.java

@@ -6,16 +6,14 @@ import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.RejectedExecutionHandler;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
-import java.util.logging.Level;
 import java.util.logging.Logger;
 
 import static java.util.logging.Level.FINE;
+import static org.briarproject.bramble.util.LogUtils.now;
 
 @NotNullByDefault
 public class TimeLoggingExecutor extends ThreadPoolExecutor {
 
-	private static final Level LOG_LEVEL = FINE;
-
 	private final Logger log;
 
 	public TimeLoggingExecutor(String tag, int corePoolSize, int maxPoolSize,
@@ -29,15 +27,15 @@ public class TimeLoggingExecutor extends ThreadPoolExecutor {
 
 	@Override
 	public void execute(Runnable r) {
-		if (log.isLoggable(LOG_LEVEL)) {
-			long submitted = System.currentTimeMillis();
+		if (log.isLoggable(FINE)) {
+			long submitted = now();
 			super.execute(() -> {
-				long started = System.currentTimeMillis();
+				long started = now();
 				long queued = started - submitted;
-				log.log(LOG_LEVEL, "Queue time " + queued + " ms");
+				log.fine("Queue time " + queued + " ms");
 				r.run();
-				long executing = System.currentTimeMillis() - started;
-				log.log(LOG_LEVEL, "Execution time " + executing + " ms");
+				long executing = now() - started;
+				log.fine("Execution time " + executing + " ms");
 			});
 		} else {
 			super.execute(r);

bramble-core/src/main/java/org/briarproject/bramble/contact/ContactExchangeTaskImpl.java

@@ -30,6 +30,7 @@ import org.briarproject.bramble.api.record.RecordWriter;
 import org.briarproject.bramble.api.record.RecordWriterFactory;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.api.transport.StreamReaderFactory;
+import org.briarproject.bramble.api.transport.StreamWriter;
 import org.briarproject.bramble.api.transport.StreamWriterFactory;
 
 import java.io.EOFException;
@@ -45,6 +46,7 @@ import javax.inject.Inject;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.contact.RecordTypes.CONTACT_INFO;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_SIGNATURE_LENGTH;
+import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.ValidationUtils.checkLength;
 import static org.briarproject.bramble.util.ValidationUtils.checkSize;
 
@@ -121,7 +123,7 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 			in = conn.getReader().getInputStream();
 			out = conn.getWriter().getOutputStream();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			listener.contactExchangeFailed();
 			tryToClose(conn);
 			return;
@@ -132,7 +134,7 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 		try {
 			localProperties = transportPropertyManager.getLocalProperties();
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			listener.contactExchangeFailed();
 			tryToClose(conn);
 			return;
@@ -152,11 +154,11 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 				recordReaderFactory.createRecordReader(streamReader);
 
 		// Create the writers
-		OutputStream streamWriter =
+		StreamWriter streamWriter =
 				streamWriterFactory.createContactExchangeStreamWriter(out,
 						alice ? aliceHeaderKey : bobHeaderKey);
 		RecordWriter recordWriter =
-				recordWriterFactory.createRecordWriter(streamWriter);
+				recordWriterFactory.createRecordWriter(streamWriter.getOutputStream());
 
 		// Derive the nonces to be signed
 		byte[] aliceNonce = crypto.mac(ALICE_NONCE_LABEL, masterSecret,
@@ -184,8 +186,8 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 						localSignature, localTimestamp);
 				recordWriter.flush();
 			}
-			// Close the outgoing stream
-			recordWriter.close();
+			// Send EOF on the outgoing stream
+			streamWriter.sendEndOfStream();
 			// Skip any remaining records from the incoming stream
 			try {
 				while (true) recordReader.readRecord();
@@ -193,7 +195,7 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 				LOG.info("End of stream");
 			}
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			listener.contactExchangeFailed();
 			tryToClose(conn);
 			return;
@@ -221,11 +223,11 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 			LOG.info("Pseudonym exchange succeeded");
 			listener.contactExchangeSucceeded(remoteInfo.author);
 		} catch (ContactExistsException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			tryToClose(conn);
 			listener.duplicateContact(remoteInfo.author);
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			tryToClose(conn);
 			listener.contactExchangeFailed();
 		}
@@ -306,7 +308,7 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 			conn.getReader().dispose(true, true);
 			conn.getWriter().dispose(true);
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/contact/ContactManagerImpl.java

@@ -46,7 +46,7 @@ class ContactManagerImpl implements ContactManager {
 			SecretKey master, long timestamp, boolean alice, boolean verified,
 			boolean active) throws DbException {
 		ContactId c = db.addContact(txn, remote, local, verified, active);
-		keyManager.addContact(txn, c, master, timestamp, alice);
+		keyManager.addContact(txn, c, master, timestamp, alice, active);
 		Contact contact = db.getContact(txn, c);
 		for (ContactHook hook : hooks) hook.addingContact(txn, contact);
 		return c;

bramble-core/src/main/java/org/briarproject/bramble/crypto/CryptoComponentImpl.java

@@ -32,6 +32,8 @@ import javax.inject.Inject;
 
 import static java.util.logging.Level.INFO;
 import static org.briarproject.bramble.util.ByteUtils.INT_32_BYTES;
+import static org.briarproject.bramble.util.LogUtils.logDuration;
+import static org.briarproject.bramble.util.LogUtils.now;
 
 @NotNullByDefault
 class CryptoComponentImpl implements CryptoComponent {
@@ -127,16 +129,14 @@ class CryptoComponentImpl implements CryptoComponent {
 			throw new IllegalArgumentException();
 		if (!(pub instanceof Curve25519PublicKey))
 			throw new IllegalArgumentException();
-		long now = System.currentTimeMillis();
+		long start = now();
 		byte[] secret = curve25519.calculateAgreement(pub.getEncoded(),
 				priv.getEncoded());
 		// If the shared secret is all zeroes, the public key is invalid
 		byte allZero = 0;
 		for (byte b : secret) allZero |= b;
 		if (allZero == 0) throw new GeneralSecurityException();
-		long duration = System.currentTimeMillis() - now;
-		if (LOG.isLoggable(INFO))
-			LOG.info("Deriving shared secret took " + duration + " ms");
+		logDuration(LOG, "Deriving shared secret", start);
 		return secret;
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/crypto/MessageEncrypter.java

@@ -152,59 +152,47 @@ public class MessageEncrypter {
 		}
 	}
 
-	public static void main(String[] args) throws Exception {
+	public static void main(String[] args) {
 		if (args.length < 1) {
 			printUsage();
-			return;
+			System.exit(1);
 		}
-		SecureRandom random = new SecureRandom();
-		MessageEncrypter encrypter = new MessageEncrypter(random);
 		if (args[0].equals("generate")) {
 			if (args.length != 3) {
 				printUsage();
-				return;
+				System.exit(1);
+			}
+			try {
+				generateKeyPair(args[1], args[2]);
+			} catch (Exception e) {
+				e.printStackTrace();
+				System.exit(2);
 			}
-			// Generate a key pair
-			KeyPair keyPair = encrypter.generateKeyPair();
-			PrintStream out = new PrintStream(new FileOutputStream(args[1]));
-			out.print(
-					StringUtils.toHexString(keyPair.getPublic().getEncoded()));
-			out.flush();
-			out.close();
-			out = new PrintStream(new FileOutputStream(args[2]));
-			out.print(
-					StringUtils.toHexString(keyPair.getPrivate().getEncoded()));
-			out.flush();
-			out.close();
 		} else if (args[0].equals("encrypt")) {
 			if (args.length != 2) {
 				printUsage();
-				return;
+				System.exit(1);
+			}
+			try {
+				encryptMessage(args[1]);
+			} catch (Exception e) {
+				e.printStackTrace();
+				System.exit(2);
 			}
-			// Encrypt a decrypted message
-			InputStream in = new FileInputStream(args[1]);
-			byte[] keyBytes = StringUtils.fromHexString(readFully(in).trim());
-			PublicKey publicKey =
-					encrypter.getKeyParser().parsePublicKey(keyBytes);
-			String message = readFully(System.in);
-			byte[] plaintext = message.getBytes(Charset.forName("UTF-8"));
-			byte[] ciphertext = encrypter.encrypt(publicKey, plaintext);
-			System.out.println(AsciiArmour.wrap(ciphertext, LINE_LENGTH));
 		} else if (args[0].equals("decrypt")) {
 			if (args.length != 2) {
 				printUsage();
-				return;
+				System.exit(1);
+			}
+			try {
+				decryptMessage(args[1]);
+			} catch (Exception e) {
+				e.printStackTrace();
+				System.exit(2);
 			}
-			// Decrypt an encrypted message
-			InputStream in = new FileInputStream(args[1]);
-			byte[] keyBytes = StringUtils.fromHexString(readFully(in).trim());
-			PrivateKey privateKey =
-					encrypter.getKeyParser().parsePrivateKey(keyBytes);
-			byte[] ciphertext = AsciiArmour.unwrap(readFully(System.in));
-			byte[] plaintext = encrypter.decrypt(privateKey, ciphertext);
-			System.out.println(new String(plaintext, Charset.forName("UTF-8")));
 		} else {
 			printUsage();
+			System.exit(1);
 		}
 	}
 
@@ -216,6 +204,46 @@ public class MessageEncrypter {
 		System.err.println("MessageEncrypter decrypt <private_key_file>");
 	}
 
+	private static void generateKeyPair(String publicKeyFile,
+			String privateKeyFile) throws Exception {
+		SecureRandom random = new SecureRandom();
+		MessageEncrypter encrypter = new MessageEncrypter(random);
+		KeyPair keyPair = encrypter.generateKeyPair();
+		PrintStream out = new PrintStream(new FileOutputStream(publicKeyFile));
+		out.print(StringUtils.toHexString(keyPair.getPublic().getEncoded()));
+		out.flush();
+		out.close();
+		out = new PrintStream(new FileOutputStream(privateKeyFile));
+		out.print(StringUtils.toHexString(keyPair.getPrivate().getEncoded()));
+		out.flush();
+		out.close();
+	}
+
+	private static void encryptMessage(String publicKeyFile) throws Exception {
+		SecureRandom random = new SecureRandom();
+		MessageEncrypter encrypter = new MessageEncrypter(random);
+		InputStream in = new FileInputStream(publicKeyFile);
+		byte[] keyBytes = StringUtils.fromHexString(readFully(in).trim());
+		PublicKey publicKey =
+				encrypter.getKeyParser().parsePublicKey(keyBytes);
+		String message = readFully(System.in);
+		byte[] plaintext = message.getBytes(Charset.forName("UTF-8"));
+		byte[] ciphertext = encrypter.encrypt(publicKey, plaintext);
+		System.out.println(AsciiArmour.wrap(ciphertext, LINE_LENGTH));
+	}
+
+	private static void decryptMessage(String privateKeyFile) throws Exception {
+		SecureRandom random = new SecureRandom();
+		MessageEncrypter encrypter = new MessageEncrypter(random);
+		InputStream in = new FileInputStream(privateKeyFile);
+		byte[] keyBytes = StringUtils.fromHexString(readFully(in).trim());
+		PrivateKey privateKey =
+				encrypter.getKeyParser().parsePrivateKey(keyBytes);
+		byte[] ciphertext = AsciiArmour.unwrap(readFully(System.in));
+		byte[] plaintext = encrypter.decrypt(privateKey, ciphertext);
+		System.out.println(new String(plaintext, Charset.forName("UTF-8")));
+	}
+
 	private static String readFully(InputStream in) throws IOException {
 		String newline = System.getProperty("line.separator");
 		StringBuilder stringBuilder = new StringBuilder();

bramble-core/src/main/java/org/briarproject/bramble/crypto/ScryptKdf.java

@@ -10,6 +10,8 @@ import java.util.logging.Logger;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.INFO;
+import static org.briarproject.bramble.util.LogUtils.logDuration;
+import static org.briarproject.bramble.util.LogUtils.now;
 
 class ScryptKdf implements PasswordBasedKdf {
 
@@ -50,13 +52,11 @@ class ScryptKdf implements PasswordBasedKdf {
 
 	@Override
 	public SecretKey deriveKey(String password, byte[] salt, int cost) {
-		long start = System.currentTimeMillis();
+		long start = now();
 		byte[] passwordBytes = StringUtils.toUtf8(password);
 		SecretKey k = new SecretKey(SCrypt.generate(passwordBytes, salt, cost,
 				BLOCK_SIZE, PARALLELIZATION, SecretKey.LENGTH));
-		long duration = System.currentTimeMillis() - start;
-		if (LOG.isLoggable(INFO))
-			LOG.info("Deriving key from password took " + duration + " ms");
+		logDuration(LOG, "Deriving key from password", start);
 		return k;
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/crypto/Sec1KeyParser.java

@@ -16,7 +16,8 @@ import java.util.logging.Logger;
 
 import javax.annotation.concurrent.Immutable;
 
-import static java.util.logging.Level.INFO;
+import static org.briarproject.bramble.util.LogUtils.logDuration;
+import static org.briarproject.bramble.util.LogUtils.now;
 
 /**
  * A key parser that uses the encoding defined in "SEC 1: Elliptic Curve
@@ -48,7 +49,7 @@ class Sec1KeyParser implements KeyParser {
 			throws GeneralSecurityException {
 		// The validation procedure comes from SEC 1, section 3.2.2.1. Note
 		// that SEC 1 parameter names are used below, not RFC 5639 names
-		long now = System.currentTimeMillis();
+		long start = now();
 		if (encodedKey.length != publicKeyBytes)
 			throw new GeneralSecurityException();
 		// The first byte must be 0x04
@@ -80,16 +81,14 @@ class Sec1KeyParser implements KeyParser {
 		// Construct a public key from the point (x, y) and the params
 		ECPublicKeyParameters k = new ECPublicKeyParameters(pub, params);
 		PublicKey p = new Sec1PublicKey(k);
-		long duration = System.currentTimeMillis() - now;
-		if (LOG.isLoggable(INFO))
-			LOG.info("Parsing public key took " + duration + " ms");
+		logDuration(LOG, "Parsing public key", start);
 		return p;
 	}
 
 	@Override
 	public PrivateKey parsePrivateKey(byte[] encodedKey)
 			throws GeneralSecurityException {
-		long now = System.currentTimeMillis();
+		long start = now();
 		if (encodedKey.length != privateKeyBytes)
 			throw new GeneralSecurityException();
 		BigInteger d = new BigInteger(1, encodedKey); // Positive signum
@@ -99,9 +98,7 @@ class Sec1KeyParser implements KeyParser {
 		// Construct a private key from the private value and the params
 		ECPrivateKeyParameters k = new ECPrivateKeyParameters(d, params);
 		PrivateKey p = new Sec1PrivateKey(k, keyBits);
-		long duration = System.currentTimeMillis() - now;
-		if (LOG.isLoggable(INFO))
-			LOG.info("Parsing private key took " + duration + " ms");
+		logDuration(LOG, "Parsing private key", start);
 		return p;
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/crypto/Signature.java

@@ -10,37 +10,37 @@ import java.security.GeneralSecurityException;
 interface Signature {
 
 	/**
-	 * @see {@link java.security.Signature#initSign(java.security.PrivateKey)}
+	 * @see java.security.Signature#initSign(java.security.PrivateKey)
 	 */
 	void initSign(PrivateKey k) throws GeneralSecurityException;
 
 	/**
-	 * @see {@link java.security.Signature#initVerify(java.security.PublicKey)}
+	 * @see java.security.Signature#initVerify(java.security.PublicKey)
 	 */
 	void initVerify(PublicKey k) throws GeneralSecurityException;
 
 	/**
-	 * @see {@link java.security.Signature#update(byte)}
+	 * @see java.security.Signature#update(byte)
 	 */
 	void update(byte b) throws GeneralSecurityException;
 
 	/**
-	 * @see {@link java.security.Signature#update(byte[])}
+	 * @see java.security.Signature#update(byte[])
 	 */
 	void update(byte[] b) throws GeneralSecurityException;
 
 	/**
-	 * @see {@link java.security.Signature#update(byte[], int, int)}
+	 * @see java.security.Signature#update(byte[], int, int)
 	 */
 	void update(byte[] b, int off, int len) throws GeneralSecurityException;
 
 	/**
-	 * @see {@link java.security.Signature#sign()}
+	 * @see java.security.Signature#sign()}
 	 */
 	byte[] sign() throws GeneralSecurityException;
 
 	/**
-	 * @see {@link java.security.Signature#verify(byte[])}
+	 * @see java.security.Signature#verify(byte[])
 	 */
 	boolean verify(byte[] signature) throws GeneralSecurityException;
 }

bramble-core/src/main/java/org/briarproject/bramble/data/BdfReaderFactoryImpl.java

@@ -8,6 +8,7 @@ import java.io.InputStream;
 
 import javax.annotation.concurrent.Immutable;
 
+import static org.briarproject.bramble.api.data.BdfReader.DEFAULT_MAX_BUFFER_SIZE;
 import static org.briarproject.bramble.api.data.BdfReader.DEFAULT_NESTED_LIMIT;
 
 @Immutable
@@ -16,11 +17,13 @@ class BdfReaderFactoryImpl implements BdfReaderFactory {
 
 	@Override
 	public BdfReader createReader(InputStream in) {
-		return new BdfReaderImpl(in, DEFAULT_NESTED_LIMIT);
+		return new BdfReaderImpl(in, DEFAULT_NESTED_LIMIT,
+				DEFAULT_MAX_BUFFER_SIZE);
 	}
 
 	@Override
-	public BdfReader createReader(InputStream in, int nestedLimit) {
-		return new BdfReaderImpl(in, nestedLimit);
+	public BdfReader createReader(InputStream in, int nestedLimit,
+			int maxBufferSize) {
+		return new BdfReaderImpl(in, nestedLimit, maxBufferSize);
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/data/BdfReaderImpl.java

@@ -37,15 +37,16 @@ class BdfReaderImpl implements BdfReader {
 	private static final byte[] EMPTY_BUFFER = new byte[0];
 
 	private final InputStream in;
-	private final int nestedLimit;
+	private final int nestedLimit, maxBufferSize;
 
 	private boolean hasLookahead = false, eof = false;
 	private byte next;
 	private byte[] buf = new byte[8];
 
-	BdfReaderImpl(InputStream in, int nestedLimit) {
+	BdfReaderImpl(InputStream in, int nestedLimit, int maxBufferSize) {
 		this.in = in;
 		this.nestedLimit = nestedLimit;
+		this.maxBufferSize = maxBufferSize;
 	}
 
 	private void readLookahead() throws IOException {
@@ -91,8 +92,8 @@ class BdfReaderImpl implements BdfReader {
 		if (hasBoolean()) return readBoolean();
 		if (hasLong()) return readLong();
 		if (hasDouble()) return readDouble();
-		if (hasString()) return readString(Integer.MAX_VALUE);
-		if (hasRaw()) return readRaw(Integer.MAX_VALUE);
+		if (hasString()) return readString();
+		if (hasRaw()) return readRaw();
 		if (hasList()) return readList(level);
 		if (hasDictionary()) return readDictionary(level);
 		throw new FormatException();
@@ -245,11 +246,11 @@ class BdfReaderImpl implements BdfReader {
 	}
 
 	@Override
-	public String readString(int maxLength) throws IOException {
+	public String readString() throws IOException {
 		if (!hasString()) throw new FormatException();
 		hasLookahead = false;
 		int length = readStringLength();
-		if (length < 0 || length > maxLength) throw new FormatException();
+		if (length < 0 || length > maxBufferSize) throw new FormatException();
 		if (length == 0) return "";
 		readIntoBuffer(length);
 		return new String(buf, 0, length, "UTF-8");
@@ -279,11 +280,11 @@ class BdfReaderImpl implements BdfReader {
 	}
 
 	@Override
-	public byte[] readRaw(int maxLength) throws IOException {
+	public byte[] readRaw() throws IOException {
 		if (!hasRaw()) throw new FormatException();
 		hasLookahead = false;
 		int length = readRawLength();
-		if (length < 0 || length > maxLength) throw new FormatException();
+		if (length < 0 || length > maxBufferSize) throw new FormatException();
 		if (length == 0) return EMPTY_BUFFER;
 		byte[] b = new byte[length];
 		readIntoBuffer(b, length);
@@ -381,7 +382,7 @@ class BdfReaderImpl implements BdfReader {
 		BdfDictionary dictionary = new BdfDictionary();
 		readDictionaryStart();
 		while (!hasDictionaryEnd())
-			dictionary.put(readString(Integer.MAX_VALUE), readObject(level + 1));
+			dictionary.put(readString(), readObject(level + 1));
 		readDictionaryEnd();
 		return dictionary;
 	}

bramble-core/src/main/java/org/briarproject/bramble/data/MetadataParserImpl.java

@@ -59,8 +59,8 @@ class MetadataParserImpl implements MetadataParser {
 		if (reader.hasBoolean()) return reader.readBoolean();
 		if (reader.hasLong()) return reader.readLong();
 		if (reader.hasDouble()) return reader.readDouble();
-		if (reader.hasString()) return reader.readString(Integer.MAX_VALUE);
-		if (reader.hasRaw()) return reader.readRaw(Integer.MAX_VALUE);
+		if (reader.hasString()) return reader.readString();
+		if (reader.hasRaw()) return reader.readRaw();
 		if (reader.hasList()) return reader.readList();
 		if (reader.hasDictionary()) return reader.readDictionary();
 		throw new FormatException();

bramble-core/src/main/java/org/briarproject/bramble/db/Database.java

@@ -34,8 +34,8 @@ import javax.annotation.Nullable;
  * A low-level interface to the database (DatabaseComponent provides a
  * high-level interface). Most operations take a transaction argument, which is
  * obtained by calling {@link #startTransaction()}. Every transaction must be
- * terminated by calling either {@link #abortTransaction(T)} or
- * {@link #commitTransaction(T)}, even if an exception is thrown.
+ * terminated by calling either {@link #abortTransaction(Object) abortTransaction(T)} or
+ * {@link #commitTransaction(Object) commitTransaction(T)}, even if an exception is thrown.
  */
 @NotNullByDefault
 interface Database<T> {
@@ -125,16 +125,10 @@ interface Database<T> {
 			throws DbException;
 
 	/**
-	 * Stores the given transport keys, optionally binding them to the given
-	 * contact, and returns a key set ID.
+	 * Stores the given transport keys for the given contact and returns a
+	 * key set ID.
 	 */
-	KeySetId addTransportKeys(T txn, @Nullable ContactId c, TransportKeys k)
-			throws DbException;
-
-	/**
-	 * Binds the given keys for the given transport to the given contact.
-	 */
-	void bindTransportKeys(T txn, ContactId c, TransportId t, KeySetId k)
+	KeySetId addTransportKeys(T txn, ContactId c, TransportKeys k)
 			throws DbException;
 
 	/**

bramble-core/src/main/java/org/briarproject/bramble/db/DatabaseComponentImpl.java

@@ -68,13 +68,15 @@ import javax.annotation.Nullable;
 import javax.annotation.concurrent.ThreadSafe;
 import javax.inject.Inject;
 
-import static java.util.logging.Level.FINE;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.sync.Group.Visibility.INVISIBLE;
 import static org.briarproject.bramble.api.sync.Group.Visibility.SHARED;
 import static org.briarproject.bramble.api.sync.ValidationManager.State.DELIVERED;
 import static org.briarproject.bramble.api.sync.ValidationManager.State.UNKNOWN;
 import static org.briarproject.bramble.db.DatabaseConstants.MAX_OFFERED_MESSAGES;
+import static org.briarproject.bramble.util.LogUtils.logDuration;
+import static org.briarproject.bramble.util.LogUtils.logException;
+import static org.briarproject.bramble.util.LogUtils.now;
 
 @ThreadSafe
 @NotNullByDefault
@@ -108,7 +110,7 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 			try {
 				close();
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 		return reopened;
@@ -125,13 +127,13 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 		// Don't allow reentrant locking
 		if (lock.getReadHoldCount() > 0) throw new IllegalStateException();
 		if (lock.getWriteHoldCount() > 0) throw new IllegalStateException();
-		long start = System.currentTimeMillis();
-		if (readOnly) lock.readLock().lock();
-		else lock.writeLock().lock();
-		if (LOG.isLoggable(FINE)) {
-			long duration = System.currentTimeMillis() - start;
-			if (readOnly) LOG.fine("Waited " + duration + " ms for read lock");
-			else LOG.fine("Waited " + duration + " ms for write lock");
+		long start = now();
+		if (readOnly) {
+			lock.readLock().lock();
+			logDuration(LOG, "Waiting for read lock", start);
+		} else {
+			lock.writeLock().lock();
+			logDuration(LOG, "Waiting for write lock", start);
 		}
 		try {
 			return new Transaction(db.startTransaction(), readOnly);
@@ -234,27 +236,15 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 	}
 
 	@Override
-	public KeySetId addTransportKeys(Transaction transaction,
-			@Nullable ContactId c, TransportKeys k) throws DbException {
-		if (transaction.isReadOnly()) throw new IllegalArgumentException();
-		T txn = unbox(transaction);
-		if (c != null && !db.containsContact(txn, c))
-			throw new NoSuchContactException();
-		if (!db.containsTransport(txn, k.getTransportId()))
-			throw new NoSuchTransportException();
-		return db.addTransportKeys(txn, c, k);
-	}
-
-	@Override
-	public void bindTransportKeys(Transaction transaction, ContactId c,
-			TransportId t, KeySetId k) throws DbException {
+	public KeySetId addTransportKeys(Transaction transaction, ContactId c,
+			TransportKeys k) throws DbException {
 		if (transaction.isReadOnly()) throw new IllegalArgumentException();
 		T txn = unbox(transaction);
 		if (!db.containsContact(txn, c))
 			throw new NoSuchContactException();
-		if (!db.containsTransport(txn, t))
+		if (!db.containsTransport(txn, k.getTransportId()))
 			throw new NoSuchTransportException();
-		db.bindTransportKeys(txn, c, t, k);
+		return db.addTransportKeys(txn, c, k);
 	}
 
 	@Override

bramble-core/src/main/java/org/briarproject/bramble/db/JdbcDatabase.java

@@ -53,6 +53,7 @@ import java.util.logging.Logger;
 import javax.annotation.Nullable;
 
 import static java.sql.Types.INTEGER;
+import static java.util.Collections.singletonList;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.db.Metadata.REMOVE;
@@ -65,6 +66,7 @@ import static org.briarproject.bramble.api.sync.ValidationManager.State.UNKNOWN;
 import static org.briarproject.bramble.db.DatabaseConstants.DB_SETTINGS_NAMESPACE;
 import static org.briarproject.bramble.db.DatabaseConstants.SCHEMA_VERSION_KEY;
 import static org.briarproject.bramble.db.ExponentialBackoff.calculateExpiry;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 /**
  * A generic database implementation that can be used with any JDBC-compatible
@@ -74,7 +76,7 @@ import static org.briarproject.bramble.db.ExponentialBackoff.calculateExpiry;
 abstract class JdbcDatabase implements Database<Connection> {
 
 	// Package access for testing
-	static final int CODE_SCHEMA_VERSION = 38;
+	static final int CODE_SCHEMA_VERSION = 39;
 
 	// Rotation period offsets for incoming transport keys
 	private static final int OFFSET_PREV = -1;
@@ -236,7 +238,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 					+ " (transportId _STRING NOT NULL,"
 					+ " keySetId _COUNTER,"
 					+ " rotationPeriod BIGINT NOT NULL,"
-					+ " contactId INT," // Null if keys are not bound
+					+ " contactId INT NOT NULL,"
 					+ " tagKey _SECRET NOT NULL,"
 					+ " headerKey _SECRET NOT NULL,"
 					+ " stream BIGINT NOT NULL,"
@@ -255,7 +257,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 					+ " (transportId _STRING NOT NULL,"
 					+ " keySetId INT NOT NULL,"
 					+ " rotationPeriod BIGINT NOT NULL,"
-					+ " contactId INT," // Null if keys are not bound
+					+ " contactId INT NOT NULL,"
 					+ " tagKey _SECRET NOT NULL,"
 					+ " headerKey _SECRET NOT NULL,"
 					+ " base BIGINT NOT NULL,"
@@ -389,7 +391,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 
 	// Package access for testing
 	List<Migration<Connection>> getMigrations() {
-		return Collections.emptyList();
+		return singletonList(new Migration38_39());
 	}
 
 	private void storeSchemaVersion(Connection txn, int version)
@@ -403,7 +405,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 		try {
 			if (rs != null) rs.close();
 		} catch (SQLException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -411,7 +413,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 		try {
 			if (s != null) s.close();
 		} catch (SQLException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -508,12 +510,11 @@ abstract class JdbcDatabase implements Database<Connection> {
 			}
 		} catch (SQLException e) {
 			// Try to close the connection
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			try {
 				txn.close();
 			} catch (SQLException e1) {
-				if (LOG.isLoggable(WARNING))
-					LOG.log(WARNING, e1.toString(), e1);
+				logException(LOG, WARNING, e1);
 			}
 			// Whatever happens, allow the database to close
 			connectionsLock.lock();
@@ -883,7 +884,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 	}
 
 	@Override
-	public KeySetId addTransportKeys(Connection txn, @Nullable ContactId c,
+	public KeySetId addTransportKeys(Connection txn, ContactId c,
 			TransportKeys k) throws DbException {
 		PreparedStatement ps = null;
 		ResultSet rs = null;
@@ -893,8 +894,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 					+ " rotationPeriod, tagKey, headerKey, stream, active)"
 					+ " VALUES (?, ?, ?, ?, ?, ?, ?)";
 			ps = txn.prepareStatement(sql);
-			if (c == null) ps.setNull(1, INTEGER);
-			else ps.setInt(1, c.getInt());
+			ps.setInt(1, c.getInt());
 			ps.setString(2, k.getTransportId().getString());
 			OutgoingKeys outCurr = k.getCurrentOutgoingKeys();
 			ps.setLong(3, outCurr.getRotationPeriod());
@@ -922,8 +922,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 					+ " VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)";
 			ps = txn.prepareStatement(sql);
 			ps.setInt(1, keySetId.getInt());
-			if (c == null) ps.setNull(2, INTEGER);
-			else ps.setInt(2, c.getInt());
+			ps.setInt(2, c.getInt());
 			ps.setString(3, k.getTransportId().getString());
 			// Previous rotation period
 			IncomingKeys inPrev = k.getPreviousIncomingKeys();
@@ -965,33 +964,6 @@ abstract class JdbcDatabase implements Database<Connection> {
 		}
 	}
 
-	@Override
-	public void bindTransportKeys(Connection txn, ContactId c, TransportId t,
-			KeySetId k) throws DbException {
-		PreparedStatement ps = null;
-		try {
-			String sql = "UPDATE outgoingKeys SET contactId = ?"
-					+ " WHERE keySetId = ?";
-			ps = txn.prepareStatement(sql);
-			ps.setInt(1, c.getInt());
-			ps.setInt(2, k.getInt());
-			int affected = ps.executeUpdate();
-			if (affected < 0) throw new DbStateException();
-			ps.close();
-			sql = "UPDATE incomingKeys SET contactId = ?"
-					+ " WHERE keySetId = ?";
-			ps = txn.prepareStatement(sql);
-			ps.setInt(1, c.getInt());
-			ps.setInt(2, k.getInt());
-			affected = ps.executeUpdate();
-			if (affected < 0) throw new DbStateException();
-			ps.close();
-		} catch (SQLException e) {
-			tryToClose(ps);
-			throw new DbException(e);
-		}
-	}
-
 	@Override
 	public boolean containsContact(Connection txn, AuthorId remote,
 			AuthorId local) throws DbException {
@@ -2172,7 +2144,6 @@ abstract class JdbcDatabase implements Database<Connection> {
 				if (inKeys.size() < (i + 1) * 3) throw new DbStateException();
 				KeySetId keySetId = new KeySetId(rs.getInt(1));
 				ContactId contactId = new ContactId(rs.getInt(2));
-				if (rs.wasNull()) contactId = null;
 				long rotationPeriod = rs.getLong(3);
 				SecretKey tagKey = new SecretKey(rs.getBytes(4));
 				SecretKey headerKey = new SecretKey(rs.getBytes(5));

bramble-core/src/main/java/org/briarproject/bramble/db/Migration38_39.java

@@ -0,0 +1,55 @@
+package org.briarproject.bramble.db;
+
+import org.briarproject.bramble.api.db.DbException;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.logging.Logger;
+
+import javax.annotation.Nullable;
+
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
+
+class Migration38_39 implements Migration<Connection> {
+
+	private static final Logger LOG =
+			Logger.getLogger(Migration38_39.class.getName());
+
+	@Override
+	public int getStartVersion() {
+		return 38;
+	}
+
+	@Override
+	public int getEndVersion() {
+		return 39;
+	}
+
+	@Override
+	public void migrate(Connection txn) throws DbException {
+		Statement s = null;
+		try {
+			s = txn.createStatement();
+			// Add not null constraints
+			s.execute("ALTER TABLE outgoingKeys"
+					+ " ALTER COLUMN contactId"
+					+ " SET NOT NULL");
+			s.execute("ALTER TABLE incomingKeys"
+					+ " ALTER COLUMN contactId"
+					+ " SET NOT NULL");
+		} catch (SQLException e) {
+			tryToClose(s);
+			throw new DbException(e);
+		}
+	}
+
+	private void tryToClose(@Nullable Statement s) {
+		try {
+			if (s != null) s.close();
+		} catch (SQLException e) {
+			logException(LOG, WARNING, e);
+		}
+	}
+}

bramble-core/src/main/java/org/briarproject/bramble/keyagreement/KeyAgreementConnector.java

@@ -31,6 +31,7 @@ import javax.annotation.Nullable;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.CONNECTION_TIMEOUT;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
 class KeyAgreementConnector {
@@ -134,7 +135,7 @@ class KeyAgreementConnector {
 			Thread.currentThread().interrupt();
 			return null;
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			return null;
 		} finally {
 			stopListening();

bramble-core/src/main/java/org/briarproject/bramble/keyagreement/KeyAgreementTaskImpl.java

@@ -28,6 +28,7 @@ import java.util.logging.Logger;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
@@ -120,13 +121,11 @@ class KeyAgreementTaskImpl extends Thread implements KeyAgreementTask,
 			// Broadcast result to caller
 			eventBus.broadcast(new KeyAgreementFinishedEvent(result));
 		} catch (AbortException e) {
-			if (LOG.isLoggable(WARNING))
-				LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			// Notify caller that the protocol was aborted
 			eventBus.broadcast(new KeyAgreementAbortedEvent(e.receivedAbort));
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING))
-				LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			// Notify caller that the connection failed
 			eventBus.broadcast(new KeyAgreementFailedEvent());
 		}

bramble-core/src/main/java/org/briarproject/bramble/keyagreement/KeyAgreementTransport.java

@@ -20,6 +20,7 @@ import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.PR
 import static org.briarproject.bramble.api.keyagreement.RecordTypes.ABORT;
 import static org.briarproject.bramble.api.keyagreement.RecordTypes.CONFIRM;
 import static org.briarproject.bramble.api.keyagreement.RecordTypes.KEY;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 /**
  * Handles the sending and receiving of BQP records.
@@ -72,7 +73,7 @@ class KeyAgreementTransport {
 		try {
 			writeRecord(ABORT, new byte[0]);
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			exception = true;
 		}
 		tryToClose(exception);
@@ -83,7 +84,7 @@ class KeyAgreementTransport {
 			kac.getConnection().getReader().dispose(exception, true);
 			kac.getConnection().getWriter().dispose(exception);
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/lifecycle/LifecycleManagerImpl.java

@@ -30,6 +30,7 @@ import javax.annotation.Nullable;
 import javax.annotation.concurrent.ThreadSafe;
 import javax.inject.Inject;
 
+import static java.util.logging.Level.FINE;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.MIGRATING_DATABASE;
@@ -43,6 +44,9 @@ import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResul
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.DB_ERROR;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.SERVICE_ERROR;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.SUCCESS;
+import static org.briarproject.bramble.util.LogUtils.logDuration;
+import static org.briarproject.bramble.util.LogUtils.logException;
+import static org.briarproject.bramble.util.LogUtils.now;
 
 @ThreadSafe
 @NotNullByDefault
@@ -101,24 +105,20 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 	}
 
 	private LocalAuthor createLocalAuthor(String nickname) {
-		long now = System.currentTimeMillis();
+		long start = now();
 		KeyPair keyPair = crypto.generateSignatureKeyPair();
 		byte[] publicKey = keyPair.getPublic().getEncoded();
 		byte[] privateKey = keyPair.getPrivate().getEncoded();
 		LocalAuthor localAuthor = authorFactory
 				.createLocalAuthor(nickname, publicKey, privateKey);
-		long duration = System.currentTimeMillis() - now;
-		if (LOG.isLoggable(INFO))
-			LOG.info("Creating local author took " + duration + " ms");
+		logDuration(LOG, "Creating local author", start);
 		return localAuthor;
 	}
 
 	private void registerLocalAuthor(LocalAuthor author) throws DbException {
-		long now = System.currentTimeMillis();
+		long start = now();
 		identityManager.registerLocalAuthor(author);
-		long duration = System.currentTimeMillis() - now;
-		if (LOG.isLoggable(INFO))
-			LOG.info("Registering local author took " + duration + " ms");
+		logDuration(LOG, "Registering local author", start);
 	}
 
 	@Override
@@ -129,15 +129,11 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 		}
 		try {
 			LOG.info("Starting services");
-			long start = System.currentTimeMillis();
+			long start = now();
 
 			boolean reopened = db.open(this);
-			long duration = System.currentTimeMillis() - start;
-			if (LOG.isLoggable(INFO)) {
-				if (reopened)
-					LOG.info("Reopening database took " + duration + " ms");
-				else LOG.info("Creating database took " + duration + " ms");
-			}
+			if (reopened) logDuration(LOG, "Reopening database", start);
+			else logDuration(LOG, "Creating database", start);
 
 			if (nickname != null) {
 				registerLocalAuthor(createLocalAuthor(nickname));
@@ -150,13 +146,11 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 			Transaction txn = db.startTransaction(false);
 			try {
 				for (Client c : clients) {
-					start = System.currentTimeMillis();
+					start = now();
 					c.createLocalState(txn);
-					duration = System.currentTimeMillis() - start;
-					if (LOG.isLoggable(INFO)) {
-						LOG.info("Starting client "
-								+ c.getClass().getSimpleName()
-								+ " took " + duration + " ms");
+					if (LOG.isLoggable(FINE)) {
+						logDuration(LOG, "Starting client "
+								+ c.getClass().getSimpleName(), start);
 					}
 				}
 				db.commitTransaction(txn);
@@ -164,12 +158,11 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 				db.endTransaction(txn);
 			}
 			for (Service s : services) {
-				start = System.currentTimeMillis();
+				start = now();
 				s.startService();
-				duration = System.currentTimeMillis() - start;
-				if (LOG.isLoggable(INFO)) {
-					LOG.info("Starting service " + s.getClass().getSimpleName()
-							+ " took " + duration + " ms");
+				if (LOG.isLoggable(FINE)) {
+					logDuration(LOG, "Starting service "
+							+ s.getClass().getSimpleName(), start);
 				}
 			}
 
@@ -178,16 +171,16 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 			eventBus.broadcast(new LifecycleEvent(RUNNING));
 			return SUCCESS;
 		} catch (DataTooOldException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			return DATA_TOO_OLD_ERROR;
 		} catch (DataTooNewException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			return DATA_TOO_NEW_ERROR;
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			return DB_ERROR;
 		} catch (ServiceException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			return SERVICE_ERROR;
 		} finally {
 			startStopSemaphore.release();
@@ -213,29 +206,26 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 			state = STOPPING;
 			eventBus.broadcast(new LifecycleEvent(STOPPING));
 			for (Service s : services) {
-				long start = System.currentTimeMillis();
+				long start = now();
 				s.stopService();
-				long duration = System.currentTimeMillis() - start;
-				if (LOG.isLoggable(INFO)) {
-					LOG.info("Stopping service " + s.getClass().getSimpleName()
-							+ " took " + duration + " ms");
+				if (LOG.isLoggable(FINE)) {
+					logDuration(LOG, "Stopping service "
+							+ s.getClass().getSimpleName(), start);
 				}
 			}
 			for (ExecutorService e : executors) {
-				if (LOG.isLoggable(INFO)) {
-					LOG.info("Stopping executor "
+				if (LOG.isLoggable(FINE)) {
+					LOG.fine("Stopping executor "
 							+ e.getClass().getSimpleName());
 				}
 				e.shutdownNow();
 			}
-			long start = System.currentTimeMillis();
+			long start = now();
 			db.close();
-			long duration = System.currentTimeMillis() - start;
-			if (LOG.isLoggable(INFO))
-				LOG.info("Closing database took " + duration + " ms");
+			logDuration(LOG, "Closing database", start);
 			shutdownLatch.countDown();
 		} catch (DbException | ServiceException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		} finally {
 			startStopSemaphore.release();
 		}

bramble-core/src/main/java/org/briarproject/bramble/plugin/ConnectionManagerImpl.java

@@ -14,12 +14,12 @@ import org.briarproject.bramble.api.sync.SyncSessionFactory;
 import org.briarproject.bramble.api.transport.KeyManager;
 import org.briarproject.bramble.api.transport.StreamContext;
 import org.briarproject.bramble.api.transport.StreamReaderFactory;
+import org.briarproject.bramble.api.transport.StreamWriter;
 import org.briarproject.bramble.api.transport.StreamWriterFactory;
 
 import java.io.EOFException;
 import java.io.IOException;
 import java.io.InputStream;
-import java.io.OutputStream;
 import java.util.concurrent.Executor;
 import java.util.logging.Logger;
 
@@ -27,6 +27,7 @@ import javax.inject.Inject;
 
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.transport.TransportConstants.TAG_LENGTH;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 class ConnectionManagerImpl implements ConnectionManager {
 
@@ -101,7 +102,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 
 	private SyncSession createSimplexOutgoingSession(StreamContext ctx,
 			TransportConnectionWriter w) throws IOException {
-		OutputStream streamWriter = streamWriterFactory.createStreamWriter(
+		StreamWriter streamWriter = streamWriterFactory.createStreamWriter(
 				w.getOutputStream(), ctx);
 		return syncSessionFactory.createSimplexOutgoingSession(
 				ctx.getContactId(), w.getMaxLatency(), streamWriter);
@@ -109,7 +110,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 
 	private SyncSession createDuplexOutgoingSession(StreamContext ctx,
 			TransportConnectionWriter w) throws IOException {
-		OutputStream streamWriter = streamWriterFactory.createStreamWriter(
+		StreamWriter streamWriter = streamWriterFactory.createStreamWriter(
 				w.getOutputStream(), ctx);
 		return syncSessionFactory.createDuplexOutgoingSession(
 				ctx.getContactId(), w.getMaxLatency(), w.getMaxIdleTime(),
@@ -135,7 +136,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				byte[] tag = readTag(reader);
 				ctx = keyManager.getStreamContext(transportId, tag);
 			} catch (IOException | DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeReader(true, false);
 				return;
 			}
@@ -151,7 +152,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				createIncomingSession(ctx, reader).run();
 				disposeReader(false, true);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeReader(true, true);
 			} finally {
 				connectionRegistry.unregisterConnection(contactId, transportId,
@@ -163,7 +164,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 			try {
 				reader.dispose(exception, recognised);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 	}
@@ -188,7 +189,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 			try {
 				ctx = keyManager.getStreamContext(contactId, transportId);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeWriter(true);
 				return;
 			}
@@ -204,7 +205,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				createSimplexOutgoingSession(ctx, writer).run();
 				disposeWriter(false);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeWriter(true);
 			} finally {
 				connectionRegistry.unregisterConnection(contactId, transportId,
@@ -216,7 +217,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 			try {
 				writer.dispose(exception);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 	}
@@ -246,7 +247,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				byte[] tag = readTag(reader);
 				ctx = keyManager.getStreamContext(transportId, tag);
 			} catch (IOException | DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeReader(true, false);
 				return;
 			}
@@ -265,7 +266,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				incomingSession.run();
 				disposeReader(false, true);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeReader(true, true);
 			} finally {
 				connectionRegistry.unregisterConnection(contactId, transportId,
@@ -279,7 +280,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 			try {
 				ctx = keyManager.getStreamContext(contactId, transportId);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeWriter(true);
 				return;
 			}
@@ -294,28 +295,30 @@ class ConnectionManagerImpl implements ConnectionManager {
 				outgoingSession.run();
 				disposeWriter(false);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeWriter(true);
 			}
 		}
 
 		private void disposeReader(boolean exception, boolean recognised) {
-			if (exception && outgoingSession != null)
-				outgoingSession.interrupt();
+			// Interrupt the outgoing session so it finishes cleanly
+			if (outgoingSession != null) outgoingSession.interrupt();
 			try {
 				reader.dispose(exception, recognised);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 
 		private void disposeWriter(boolean exception) {
+			// Interrupt the incoming session if an exception occurred,
+			// otherwise wait for the end of stream marker
 			if (exception && incomingSession != null)
 				incomingSession.interrupt();
 			try {
 				writer.dispose(exception);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 	}
@@ -345,7 +348,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 			try {
 				ctx = keyManager.getStreamContext(contactId, transportId);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeWriter(true);
 				return;
 			}
@@ -362,7 +365,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				outgoingSession.run();
 				disposeWriter(false);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeWriter(true);
 			}
 		}
@@ -374,7 +377,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				byte[] tag = readTag(reader);
 				ctx = keyManager.getStreamContext(transportId, tag);
 			} catch (IOException | DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeReader(true, false);
 				return;
 			}
@@ -398,7 +401,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				incomingSession.run();
 				disposeReader(false, true);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeReader(true, true);
 			} finally {
 				connectionRegistry.unregisterConnection(contactId, transportId,
@@ -407,22 +410,24 @@ class ConnectionManagerImpl implements ConnectionManager {
 		}
 
 		private void disposeReader(boolean exception, boolean recognised) {
-			if (exception && outgoingSession != null)
-				outgoingSession.interrupt();
+			// Interrupt the outgoing session so it finishes cleanly
+			if (outgoingSession != null) outgoingSession.interrupt();
 			try {
 				reader.dispose(exception, recognised);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 
 		private void disposeWriter(boolean exception) {
+			// Interrupt the incoming session if an exception occurred,
+			// otherwise wait for the end of stream marker
 			if (exception && incomingSession != null)
 				incomingSession.interrupt();
 			try {
 				writer.dispose(exception);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 	}

bramble-core/src/main/java/org/briarproject/bramble/plugin/ConnectionRegistryImpl.java

@@ -106,7 +106,7 @@ class ConnectionRegistryImpl implements ConnectionRegistry {
 			if (m == null) return Collections.emptyList();
 			List<ContactId> ids = new ArrayList<>(m.keySet());
 			if (LOG.isLoggable(INFO))
-				LOG.info(ids.size() + " contacts connected");
+				LOG.info(ids.size() + " contacts connected: " + t);
 			return ids;
 		} finally {
 			lock.unlock();

bramble-core/src/main/java/org/briarproject/bramble/plugin/PluginManagerImpl.java

@@ -8,6 +8,7 @@ import org.briarproject.bramble.api.lifecycle.Service;
 import org.briarproject.bramble.api.lifecycle.ServiceException;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.ConnectionManager;
+import org.briarproject.bramble.api.plugin.ConnectionRegistry;
 import org.briarproject.bramble.api.plugin.Plugin;
 import org.briarproject.bramble.api.plugin.PluginCallback;
 import org.briarproject.bramble.api.plugin.PluginConfig;
@@ -29,25 +30,31 @@ import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.properties.TransportPropertyManager;
 import org.briarproject.bramble.api.settings.Settings;
 import org.briarproject.bramble.api.settings.SettingsManager;
-import org.briarproject.bramble.api.ui.UiCallback;
+import org.briarproject.bramble.api.system.Clock;
+import org.briarproject.bramble.api.system.Scheduler;
 
+import java.security.SecureRandom;
 import java.util.ArrayList;
 import java.util.Collection;
-import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.Executor;
+import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.logging.Logger;
 
 import javax.annotation.concurrent.ThreadSafe;
 import javax.inject.Inject;
 
+import static java.util.logging.Level.FINE;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logDuration;
+import static org.briarproject.bramble.util.LogUtils.logException;
+import static org.briarproject.bramble.util.LogUtils.now;
 
 @ThreadSafe
 @NotNullByDefault
@@ -57,12 +64,15 @@ class PluginManagerImpl implements PluginManager, Service {
 			Logger.getLogger(PluginManagerImpl.class.getName());
 
 	private final Executor ioExecutor;
+	private final ScheduledExecutorService scheduler;
 	private final EventBus eventBus;
 	private final PluginConfig pluginConfig;
 	private final ConnectionManager connectionManager;
+	private final ConnectionRegistry connectionRegistry;
 	private final SettingsManager settingsManager;
 	private final TransportPropertyManager transportPropertyManager;
-	private final UiCallback uiCallback;
+	private final SecureRandom random;
+	private final Clock clock;
 	private final Map<TransportId, Plugin> plugins;
 	private final List<SimplexPlugin> simplexPlugins;
 	private final List<DuplexPlugin> duplexPlugins;
@@ -70,27 +80,41 @@ class PluginManagerImpl implements PluginManager, Service {
 	private final AtomicBoolean used = new AtomicBoolean(false);
 
 	@Inject
-	PluginManagerImpl(@IoExecutor Executor ioExecutor, EventBus eventBus,
+	PluginManagerImpl(@IoExecutor Executor ioExecutor,
+			@Scheduler ScheduledExecutorService scheduler, EventBus eventBus,
 			PluginConfig pluginConfig, ConnectionManager connectionManager,
+			ConnectionRegistry connectionRegistry,
 			SettingsManager settingsManager,
 			TransportPropertyManager transportPropertyManager,
-			UiCallback uiCallback) {
+			SecureRandom random, Clock clock) {
 		this.ioExecutor = ioExecutor;
+		this.scheduler = scheduler;
 		this.eventBus = eventBus;
 		this.pluginConfig = pluginConfig;
 		this.connectionManager = connectionManager;
+		this.connectionRegistry = connectionRegistry;
 		this.settingsManager = settingsManager;
 		this.transportPropertyManager = transportPropertyManager;
-		this.uiCallback = uiCallback;
+		this.random = random;
+		this.clock = clock;
 		plugins = new ConcurrentHashMap<>();
 		simplexPlugins = new CopyOnWriteArrayList<>();
 		duplexPlugins = new CopyOnWriteArrayList<>();
 		startLatches = new ConcurrentHashMap<>();
+
 	}
 
 	@Override
-	public void startService() throws ServiceException {
+	public void startService() {
 		if (used.getAndSet(true)) throw new IllegalStateException();
+		// Instantiate the poller
+		if (pluginConfig.shouldPoll()) {
+			LOG.info("Starting poller");
+			Poller poller = new Poller(ioExecutor, scheduler, connectionManager,
+					connectionRegistry, this, transportPropertyManager, random,
+					clock);
+			eventBus.addListener(poller);
+		}
 		// Instantiate the simplex plugins and start them asynchronously
 		LOG.info("Starting simplex plugins");
 		for (SimplexPluginFactory f : pluginConfig.getSimplexFactories()) {
@@ -185,17 +209,16 @@ class PluginManagerImpl implements PluginManager, Service {
 		@Override
 		public void run() {
 			try {
-				long start = System.currentTimeMillis();
+				long start = now();
 				plugin.start();
-				long duration = System.currentTimeMillis() - start;
-				if (LOG.isLoggable(INFO)) {
-					LOG.info("Starting plugin " + plugin.getId() + " took " +
-							duration + " ms");
+				if (LOG.isLoggable(FINE)) {
+					logDuration(LOG, "Starting plugin " + plugin.getId(),
+							start);
 				}
 			} catch (PluginException e) {
 				if (LOG.isLoggable(WARNING)) {
 					LOG.warning("Plugin " + plugin.getId() + " did not start");
-					LOG.log(WARNING, e.toString(), e);
+					logException(LOG, WARNING, e);
 				}
 			} finally {
 				startLatch.countDown();
@@ -223,12 +246,11 @@ class PluginManagerImpl implements PluginManager, Service {
 				// Wait for the plugin to finish starting
 				startLatch.await();
 				// Stop the plugin
-				long start = System.currentTimeMillis();
+				long start = now();
 				plugin.stop();
-				long duration = System.currentTimeMillis() - start;
-				if (LOG.isLoggable(INFO)) {
-					LOG.info("Stopping plugin " + plugin.getId()
-							+ " took " + duration + " ms");
+				if (LOG.isLoggable(FINE)) {
+					logDuration(LOG, "Stopping plugin " + plugin.getId(),
+							start);
 				}
 			} catch (InterruptedException e) {
 				LOG.warning("Interrupted while waiting for plugin to stop");
@@ -236,7 +258,7 @@ class PluginManagerImpl implements PluginManager, Service {
 			} catch (PluginException e) {
 				if (LOG.isLoggable(WARNING)) {
 					LOG.warning("Plugin " + plugin.getId() + " did not stop");
-					LOG.log(WARNING, e.toString(), e);
+					logException(LOG, WARNING, e);
 				}
 			} finally {
 				stopLatch.countDown();
@@ -258,7 +280,7 @@ class PluginManagerImpl implements PluginManager, Service {
 			try {
 				return settingsManager.getSettings(id.getString());
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				return new Settings();
 			}
 		}
@@ -268,27 +290,7 @@ class PluginManagerImpl implements PluginManager, Service {
 			try {
 				return transportPropertyManager.getLocalProperties(id);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
-				return new TransportProperties();
-			}
-		}
-
-		@Override
-		public Map<ContactId, TransportProperties> getRemoteProperties() {
-			try {
-				return transportPropertyManager.getRemoteProperties(id);
-			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
-				return Collections.emptyMap();
-			}
-		}
-
-		@Override
-		public TransportProperties getRemoteProperties(ContactId c) {
-			try {
-				return transportPropertyManager.getRemoteProperties(c, id);
-			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				return new TransportProperties();
 			}
 		}
@@ -298,7 +300,7 @@ class PluginManagerImpl implements PluginManager, Service {
 			try {
 				settingsManager.mergeSettings(s, id.getString());
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 
@@ -307,25 +309,10 @@ class PluginManagerImpl implements PluginManager, Service {
 			try {
 				transportPropertyManager.mergeLocalProperties(id, p);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 
-		@Override
-		public int showChoice(String[] options, String... message) {
-			return uiCallback.showChoice(options, message);
-		}
-
-		@Override
-		public boolean showConfirmationMessage(String... message) {
-			return uiCallback.showConfirmationMessage(message);
-		}
-
-		@Override
-		public void showMessage(String... message) {
-			uiCallback.showMessage(message);
-		}
-
 		@Override
 		public void transportEnabled() {
 			eventBus.broadcast(new TransportEnabledEvent(id));

bramble-core/src/main/java/org/briarproject/bramble/plugin/PluginModule.java

@@ -1,18 +1,10 @@
 package org.briarproject.bramble.plugin;
 
-import org.briarproject.bramble.api.event.EventBus;
-import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.plugin.BackoffFactory;
 import org.briarproject.bramble.api.plugin.ConnectionManager;
 import org.briarproject.bramble.api.plugin.ConnectionRegistry;
 import org.briarproject.bramble.api.plugin.PluginManager;
-import org.briarproject.bramble.api.system.Clock;
-import org.briarproject.bramble.api.system.Scheduler;
-
-import java.security.SecureRandom;
-import java.util.concurrent.Executor;
-import java.util.concurrent.ScheduledExecutorService;
 
 import javax.inject.Inject;
 import javax.inject.Singleton;
@@ -26,8 +18,6 @@ public class PluginModule {
 	public static class EagerSingletons {
 		@Inject
 		PluginManager pluginManager;
-		@Inject
-		Poller poller;
 	}
 
 	@Provides
@@ -35,19 +25,6 @@ public class PluginModule {
 		return new BackoffFactoryImpl();
 	}
 
-	@Provides
-	@Singleton
-	Poller providePoller(@IoExecutor Executor ioExecutor,
-			@Scheduler ScheduledExecutorService scheduler,
-			ConnectionManager connectionManager,
-			ConnectionRegistry connectionRegistry, PluginManager pluginManager,
-			SecureRandom random, Clock clock, EventBus eventBus) {
-		Poller poller = new Poller(ioExecutor, scheduler, connectionManager,
-				connectionRegistry, pluginManager, random, clock);
-		eventBus.addListener(poller);
-		return poller;
-	}
-
 	@Provides
 	@Singleton
 	ConnectionManager provideConnectionManager(

bramble-core/src/main/java/org/briarproject/bramble/plugin/Poller.java

@@ -2,6 +2,7 @@ package org.briarproject.bramble.plugin;
 
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.contact.event.ContactStatusChangedEvent;
+import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.event.EventListener;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
@@ -19,10 +20,13 @@ import org.briarproject.bramble.api.plugin.event.ConnectionOpenedEvent;
 import org.briarproject.bramble.api.plugin.event.TransportDisabledEvent;
 import org.briarproject.bramble.api.plugin.event.TransportEnabledEvent;
 import org.briarproject.bramble.api.plugin.simplex.SimplexPlugin;
+import org.briarproject.bramble.api.properties.TransportProperties;
+import org.briarproject.bramble.api.properties.TransportPropertyManager;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.api.system.Scheduler;
 
 import java.security.SecureRandom;
+import java.util.Collection;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.Executor;
@@ -33,10 +37,11 @@ import java.util.concurrent.locks.ReentrantLock;
 import java.util.logging.Logger;
 
 import javax.annotation.concurrent.ThreadSafe;
-import javax.inject.Inject;
 
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static java.util.logging.Level.INFO;
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @ThreadSafe
 @NotNullByDefault
@@ -49,22 +54,24 @@ class Poller implements EventListener {
 	private final ConnectionManager connectionManager;
 	private final ConnectionRegistry connectionRegistry;
 	private final PluginManager pluginManager;
+	private final TransportPropertyManager transportPropertyManager;
 	private final SecureRandom random;
 	private final Clock clock;
 	private final Lock lock;
 	private final Map<TransportId, ScheduledPollTask> tasks; // Locking: lock
 
-	@Inject
 	Poller(@IoExecutor Executor ioExecutor,
 			@Scheduler ScheduledExecutorService scheduler,
 			ConnectionManager connectionManager,
 			ConnectionRegistry connectionRegistry, PluginManager pluginManager,
+			TransportPropertyManager transportPropertyManager,
 			SecureRandom random, Clock clock) {
 		this.ioExecutor = ioExecutor;
 		this.scheduler = scheduler;
 		this.connectionManager = connectionManager;
 		this.connectionRegistry = connectionRegistry;
 		this.pluginManager = pluginManager;
+		this.transportPropertyManager = transportPropertyManager;
 		this.random = random;
 		this.clock = clock;
 		lock = new ReentrantLock();
@@ -120,10 +127,15 @@ class Poller implements EventListener {
 	private void connectToContact(ContactId c, SimplexPlugin p) {
 		ioExecutor.execute(() -> {
 			TransportId t = p.getId();
-			if (!connectionRegistry.isConnected(c, t)) {
-				TransportConnectionWriter w = p.createWriter(c);
+			if (connectionRegistry.isConnected(c, t)) return;
+			try {
+				TransportProperties props =
+						transportPropertyManager.getRemoteProperties(c, t);
+				TransportConnectionWriter w = p.createWriter(props);
 				if (w != null)
 					connectionManager.manageOutgoingConnection(c, t, w);
+			} catch (DbException e) {
+				logException(LOG, WARNING, e);
 			}
 		});
 	}
@@ -131,10 +143,15 @@ class Poller implements EventListener {
 	private void connectToContact(ContactId c, DuplexPlugin p) {
 		ioExecutor.execute(() -> {
 			TransportId t = p.getId();
-			if (!connectionRegistry.isConnected(c, t)) {
-				DuplexTransportConnection d = p.createConnection(c);
+			if (connectionRegistry.isConnected(c, t)) return;
+			try {
+				TransportProperties props =
+						transportPropertyManager.getRemoteProperties(c, t);
+				DuplexTransportConnection d = p.createConnection(props);
 				if (d != null)
 					connectionManager.manageOutgoingConnection(c, t, d);
+			} catch (DbException e) {
+				logException(LOG, WARNING, e);
 			}
 		});
 	}
@@ -186,7 +203,17 @@ class Poller implements EventListener {
 	private void poll(Plugin p) {
 		TransportId t = p.getId();
 		if (LOG.isLoggable(INFO)) LOG.info("Polling plugin " + t);
-		p.poll(connectionRegistry.getConnectedContacts(t));
+		try {
+			Map<ContactId, TransportProperties> remote =
+					transportPropertyManager.getRemoteProperties(t);
+			Collection<ContactId> connected =
+					connectionRegistry.getConnectedContacts(t);
+			remote = new HashMap<>(remote);
+			remote.keySet().removeAll(connected);
+			if (!remote.isEmpty()) p.poll(remote);
+		} catch (DbException e) {
+			logException(LOG, WARNING, e);
+		}
 	}
 
 	private class ScheduledPollTask {

bramble-core/src/main/java/org/briarproject/bramble/plugin/bluetooth/BluetoothConnectionLimiterImpl.java

@@ -13,6 +13,7 @@ import javax.annotation.concurrent.ThreadSafe;
 
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
 @ThreadSafe
@@ -92,7 +93,7 @@ class BluetoothConnectionLimiterImpl implements BluetoothConnectionLimiter {
 			conn.getWriter().dispose(false);
 			conn.getReader().dispose(false, false);
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/plugin/bluetooth/BluetoothPlugin.java

@@ -26,7 +26,6 @@ import org.briarproject.bramble.util.StringUtils;
 
 import java.io.IOException;
 import java.security.SecureRandom;
-import java.util.Collection;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.UUID;
@@ -44,6 +43,7 @@ import static org.briarproject.bramble.api.plugin.BluetoothConstants.PREF_BT_ENA
 import static org.briarproject.bramble.api.plugin.BluetoothConstants.PROP_ADDRESS;
 import static org.briarproject.bramble.api.plugin.BluetoothConstants.PROP_UUID;
 import static org.briarproject.bramble.api.plugin.BluetoothConstants.UUID_BYTES;
+import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubMacAddress;
 
 @MethodsNotNullByDefault
@@ -170,7 +170,7 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 			try {
 				ss = openServerSocket(contactConnectionsUuid);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				return;
 			}
 			if (!isRunning() || !shouldAllowContactConnections()) {
@@ -250,19 +250,16 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 	}
 
 	@Override
-	public void poll(Collection<ContactId> connected) {
+	public void poll(Map<ContactId, TransportProperties> contacts) {
 		if (!isRunning() || !shouldAllowContactConnections()) return;
 		backoff.increment();
 		// Try to connect to known devices in parallel
-		Map<ContactId, TransportProperties> remote =
-				callback.getRemoteProperties();
-		for (Entry<ContactId, TransportProperties> e : remote.entrySet()) {
-			ContactId c = e.getKey();
-			if (connected.contains(c)) continue;
+		for (Entry<ContactId, TransportProperties> e : contacts.entrySet()) {
 			String address = e.getValue().get(PROP_ADDRESS);
 			if (StringUtils.isNullOrEmpty(address)) continue;
 			String uuid = e.getValue().get(PROP_UUID);
 			if (StringUtils.isNullOrEmpty(uuid)) continue;
+			ContactId c = e.getKey();
 			ioExecutor.execute(() -> {
 				if (!isRunning() || !shouldAllowContactConnections()) return;
 				if (!connectionLimiter.canOpenContactConnection()) return;
@@ -308,10 +305,9 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 	}
 
 	@Override
-	public DuplexTransportConnection createConnection(ContactId c) {
+	public DuplexTransportConnection createConnection(TransportProperties p) {
 		if (!isRunning() || !shouldAllowContactConnections()) return null;
 		if (!connectionLimiter.canOpenContactConnection()) return null;
-		TransportProperties p = callback.getRemoteProperties(c);
 		String address = p.get(PROP_ADDRESS);
 		if (StringUtils.isNullOrEmpty(address)) return null;
 		String uuid = p.get(PROP_UUID);
@@ -341,7 +337,7 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 		try {
 			ss = openServerSocket(uuid);
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			return null;
 		}
 		if (!isRunning()) {

bramble-core/src/main/java/org/briarproject/bramble/plugin/file/FilePlugin.java

@@ -1,27 +1,22 @@
 package org.briarproject.bramble.plugin.file;
 
-import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.TransportConnectionReader;
 import org.briarproject.bramble.api.plugin.TransportConnectionWriter;
 import org.briarproject.bramble.api.plugin.simplex.SimplexPlugin;
 import org.briarproject.bramble.api.plugin.simplex.SimplexPluginCallback;
+import org.briarproject.bramble.api.properties.TransportProperties;
 
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
-import java.io.OutputStream;
-import java.util.Collection;
-import java.util.Locale;
-import java.util.concurrent.Executor;
-import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.logging.Logger;
 
-import javax.annotation.Nullable;
-
 import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.api.transport.TransportConstants.MIN_STREAM_LENGTH;
+import static org.briarproject.bramble.api.plugin.FileConstants.PROP_PATH;
+import static org.briarproject.bramble.util.LogUtils.logException;
+import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
 
 @NotNullByDefault
 abstract class FilePlugin implements SimplexPlugin {
@@ -29,25 +24,15 @@ abstract class FilePlugin implements SimplexPlugin {
 	private static final Logger LOG =
 			Logger.getLogger(FilePlugin.class.getName());
 
-	protected final Executor ioExecutor;
 	protected final SimplexPluginCallback callback;
 	protected final int maxLatency;
-	protected final AtomicBoolean used = new AtomicBoolean(false);
 
-	protected volatile boolean running = false;
+	protected abstract void writerFinished(File f, boolean exception);
 
-	@Nullable
-	protected abstract File chooseOutputDirectory();
+	protected abstract void readerFinished(File f, boolean exception,
+			boolean recognised);
 
-	protected abstract Collection<File> findFilesByName(String filename);
-
-	protected abstract void writerFinished(File f);
-
-	protected abstract void readerFinished(File f);
-
-	protected FilePlugin(Executor ioExecutor, SimplexPluginCallback callback,
-			int maxLatency) {
-		this.ioExecutor = ioExecutor;
+	FilePlugin(SimplexPluginCallback callback, int maxLatency) {
 		this.callback = callback;
 		this.maxLatency = maxLatency;
 	}
@@ -58,81 +43,36 @@ abstract class FilePlugin implements SimplexPlugin {
 	}
 
 	@Override
-	public int getMaxIdleTime() {
-		return Integer.MAX_VALUE; // We don't need keepalives
-	}
-
-	@Override
-	public boolean isRunning() {
-		return running;
-	}
-
-	@Override
-	public TransportConnectionReader createReader(ContactId c) {
-		return null;
-	}
-
-	@Override
-	public TransportConnectionWriter createWriter(ContactId c) {
-		if (!running) return null;
-		return createWriter(createConnectionFilename());
-	}
-
-	private String createConnectionFilename() {
-		StringBuilder s = new StringBuilder(12);
-		for (int i = 0; i < 8; i++) s.append((char) ('a' + Math.random() * 26));
-		s.append(".dat");
-		return s.toString();
-	}
-
-	// Package access for testing
-	boolean isPossibleConnectionFilename(String filename) {
-		return filename.toLowerCase(Locale.US).matches("[a-z]{8}\\.dat");
-	}
-
-	@Nullable
-	private TransportConnectionWriter createWriter(String filename) {
-		if (!running) return null;
-		File dir = chooseOutputDirectory();
-		if (dir == null || !dir.exists() || !dir.isDirectory()) return null;
-		File f = new File(dir, filename);
+	public TransportConnectionReader createReader(TransportProperties p) {
+		if (!isRunning()) return null;
+		String path = p.get(PROP_PATH);
+		if (isNullOrEmpty(path)) return null;
 		try {
-			long capacity = dir.getFreeSpace();
-			if (capacity < MIN_STREAM_LENGTH) return null;
-			OutputStream out = new FileOutputStream(f);
-			return new FileTransportWriter(f, out, capacity, this);
+			File file = new File(path);
+			FileInputStream in = new FileInputStream(file);
+			return new FileTransportReader(file, in, this);
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
-			f.delete();
+			logException(LOG, WARNING, e);
 			return null;
 		}
 	}
 
-	protected void createReaderFromFile(File f) {
-		if (!running) return;
-		ioExecutor.execute(new ReaderCreator(f));
-	}
-
-	private class ReaderCreator implements Runnable {
-
-		private final File file;
-
-		private ReaderCreator(File file) {
-			this.file = file;
-		}
-
-		@Override
-		public void run() {
-			if (isPossibleConnectionFilename(file.getName())) {
-				try {
-					FileInputStream in = new FileInputStream(file);
-					callback.readerCreated(new FileTransportReader(file, in,
-							FilePlugin.this));
-				} catch (IOException e) {
-					if (LOG.isLoggable(WARNING))
-						LOG.log(WARNING, e.toString(), e);
-				}
+	@Override
+	public TransportConnectionWriter createWriter(TransportProperties p) {
+		if (!isRunning()) return null;
+		String path = p.get(PROP_PATH);
+		if (isNullOrEmpty(path)) return null;
+		try {
+			File file = new File(path);
+			if (!file.exists() && !file.createNewFile()) {
+				LOG.info("Failed to create file");
+				return null;
 			}
+			FileOutputStream out = new FileOutputStream(file);
+			return new FileTransportWriter(file, out, this);
+		} catch (IOException e) {
+			logException(LOG, WARNING, e);
+			return null;
 		}
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/plugin/file/FileTransportReader.java

@@ -9,6 +9,7 @@ import java.io.InputStream;
 import java.util.logging.Logger;
 
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
 class FileTransportReader implements TransportConnectionReader {
@@ -36,11 +37,8 @@ class FileTransportReader implements TransportConnectionReader {
 		try {
 			in.close();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
-		}
-		if (recognised) {
-			file.delete();
-			plugin.readerFinished(file);
+			logException(LOG, WARNING, e);
 		}
+		plugin.readerFinished(file, exception, recognised);
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/plugin/file/FileTransportWriter.java

@@ -9,6 +9,7 @@ import java.io.OutputStream;
 import java.util.logging.Logger;
 
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
 class FileTransportWriter implements TransportConnectionWriter {
@@ -18,14 +19,11 @@ class FileTransportWriter implements TransportConnectionWriter {
 
 	private final File file;
 	private final OutputStream out;
-	private final long capacity;
 	private final FilePlugin plugin;
 
-	FileTransportWriter(File file, OutputStream out, long capacity,
-			FilePlugin plugin) {
+	FileTransportWriter(File file, OutputStream out, FilePlugin plugin) {
 		this.file = file;
 		this.out = out;
-		this.capacity = capacity;
 		this.plugin = plugin;
 	}
 
@@ -39,11 +37,6 @@ class FileTransportWriter implements TransportConnectionWriter {
 		return plugin.getMaxIdleTime();
 	}
 
-	@Override
-	public long getCapacity() {
-		return capacity;
-	}
-
 	@Override
 	public OutputStream getOutputStream() {
 		return out;
@@ -54,9 +47,8 @@ class FileTransportWriter implements TransportConnectionWriter {
 		try {
 			out.close();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
-		if (exception) file.delete();
-		else plugin.writerFinished(file);
+		plugin.writerFinished(file, exception);
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/LanTcpPlugin.java

@@ -35,6 +35,7 @@ import static org.briarproject.bramble.api.plugin.LanTcpConstants.ID;
 import static org.briarproject.bramble.api.plugin.LanTcpConstants.PREF_LAN_IP_PORTS;
 import static org.briarproject.bramble.api.plugin.LanTcpConstants.PROP_IP_PORTS;
 import static org.briarproject.bramble.util.ByteUtils.MAX_16_BIT_UNSIGNED;
+import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubSocketAddress;
 
 @NotNullByDefault
@@ -295,7 +296,7 @@ class LanTcpPlugin extends TcpPlugin {
 			try {
 				ss.close();
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 	}

bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/PortMapperImpl.java

@@ -17,6 +17,7 @@ import javax.xml.parsers.ParserConfigurationException;
 
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubInetAddress;
 
 @ThreadSafe
@@ -59,7 +60,7 @@ class PortMapperImpl implements PortMapper {
 			if (externalString != null)
 				external = InetAddress.getByName(externalString);
 		} catch (IOException | SAXException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 		return new MappingResult(internal, external, port, succeeded);
 	}
@@ -76,7 +77,7 @@ class PortMapperImpl implements PortMapper {
 		try {
 			d.discover();
 		} catch (IOException | SAXException | ParserConfigurationException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 		gateway = d.getValidGateway();
 	}
@@ -87,7 +88,7 @@ class PortMapperImpl implements PortMapper {
 			if (LOG.isLoggable(INFO))
 				LOG.info("Deleted mapping for port " + port);
 		} catch (IOException | SAXException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/TcpPlugin.java

@@ -37,6 +37,7 @@ import javax.annotation.Nullable;
 
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubSocketAddress;
 
 @MethodsNotNullByDefault
@@ -152,7 +153,7 @@ abstract class TcpPlugin implements DuplexPlugin {
 		try {
 			if (ss != null) ss.close();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		} finally {
 			callback.transportDisabled();
 		}
@@ -207,20 +208,16 @@ abstract class TcpPlugin implements DuplexPlugin {
 	}
 
 	@Override
-	public void poll(Collection<ContactId> connected) {
+	public void poll(Map<ContactId, TransportProperties> contacts) {
 		if (!isRunning()) return;
 		backoff.increment();
-		Map<ContactId, TransportProperties> remote =
-				callback.getRemoteProperties();
-		for (Entry<ContactId, TransportProperties> e : remote.entrySet()) {
-			ContactId c = e.getKey();
-			if (!connected.contains(c)) connectAndCallBack(c, e.getValue());
+		for (Entry<ContactId, TransportProperties> e : contacts.entrySet()) {
+			connectAndCallBack(e.getKey(), e.getValue());
 		}
 	}
 
 	private void connectAndCallBack(ContactId c, TransportProperties p) {
 		ioExecutor.execute(() -> {
-			if (!isRunning()) return;
 			DuplexTransportConnection d = createConnection(p);
 			if (d != null) {
 				backoff.reset();
@@ -230,13 +227,8 @@ abstract class TcpPlugin implements DuplexPlugin {
 	}
 
 	@Override
-	public DuplexTransportConnection createConnection(ContactId c) {
+	public DuplexTransportConnection createConnection(TransportProperties p) {
 		if (!isRunning()) return null;
-		return createConnection(callback.getRemoteProperties(c));
-	}
-
-	@Nullable
-	private DuplexTransportConnection createConnection(TransportProperties p) {
 		for (InetSocketAddress remote : getRemoteSocketAddresses(p)) {
 			if (!isConnectable(remote)) {
 				if (LOG.isLoggable(INFO)) {
@@ -315,7 +307,7 @@ abstract class TcpPlugin implements DuplexPlugin {
 		try {
 			ifaces = Collections.list(NetworkInterface.getNetworkInterfaces());
 		} catch (SocketException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			return Collections.emptyList();
 		}
 		List<InetAddress> addrs = new ArrayList<>();

bramble-core/src/main/java/org/briarproject/bramble/reliability/ReliabilityLayerImpl.java

@@ -16,6 +16,7 @@ import java.util.logging.Logger;
 
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
@@ -78,7 +79,7 @@ class ReliabilityLayerImpl implements ReliabilityLayer, WriteHandler {
 				Thread.currentThread().interrupt();
 				running = false;
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				running = false;
 			}
 		});

bramble-core/src/main/java/org/briarproject/bramble/reporting/DevReporterImpl.java

@@ -1,7 +1,12 @@
 package org.briarproject.bramble.reporting;
 
 import org.briarproject.bramble.api.crypto.CryptoComponent;
+import org.briarproject.bramble.api.event.Event;
+import org.briarproject.bramble.api.event.EventListener;
+import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.TorConstants;
+import org.briarproject.bramble.api.plugin.event.TransportEnabledEvent;
 import org.briarproject.bramble.api.reporting.DevConfig;
 import org.briarproject.bramble.api.reporting.DevReporter;
 import org.briarproject.bramble.util.IoUtils;
@@ -18,17 +23,20 @@ import java.io.OutputStream;
 import java.io.OutputStreamWriter;
 import java.io.PrintWriter;
 import java.net.Socket;
+import java.util.concurrent.Executor;
 import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
 import javax.annotation.concurrent.Immutable;
+import javax.inject.Inject;
 import javax.net.SocketFactory;
 
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @Immutable
 @NotNullByDefault
-class DevReporterImpl implements DevReporter {
+class DevReporterImpl implements DevReporter, EventListener {
 
 	private static final Logger LOG =
 			Logger.getLogger(DevReporterImpl.class.getName());
@@ -36,12 +44,15 @@ class DevReporterImpl implements DevReporter {
 	private static final int SOCKET_TIMEOUT = 30 * 1000; // 30 seconds
 	private static final int LINE_LENGTH = 70;
 
+	private final Executor ioExecutor;
 	private final CryptoComponent crypto;
 	private final DevConfig devConfig;
 	private final SocketFactory torSocketFactory;
 
-	DevReporterImpl(CryptoComponent crypto, DevConfig devConfig,
-			SocketFactory torSocketFactory) {
+	@Inject
+	DevReporterImpl(@IoExecutor Executor ioExecutor, CryptoComponent crypto,
+			DevConfig devConfig, SocketFactory torSocketFactory) {
+		this.ioExecutor = ioExecutor;
 		this.crypto = crypto;
 		this.devConfig = devConfig;
 		this.torSocketFactory = torSocketFactory;
@@ -63,6 +74,7 @@ class DevReporterImpl implements DevReporter {
 	@Override
 	public void encryptReportToFile(File reportDir, String filename,
 			String report) throws FileNotFoundException {
+		LOG.info("Encrypting report to file");
 		byte[] plaintext = StringUtils.toUtf8(report);
 		byte[] ciphertext = crypto.encryptToKey(devConfig.getDevPublicKey(),
 				plaintext);
@@ -82,7 +94,17 @@ class DevReporterImpl implements DevReporter {
 	}
 
 	@Override
-	public void sendReports(File reportDir) {
+	public void eventOccurred(Event e) {
+		if (e instanceof TransportEnabledEvent) {
+			TransportEnabledEvent t = (TransportEnabledEvent) e;
+			if (t.getTransportId().equals(TorConstants.ID))
+				ioExecutor.execute(this::sendReports);
+		}
+	}
+
+	@Override
+	public void sendReports() {
+		File reportDir = devConfig.getReportDir();
 		File[] reports = reportDir.listFiles();
 		if (reports == null || reports.length == 0)
 			return; // No reports to send
@@ -111,7 +133,7 @@ class DevReporterImpl implements DevReporter {
 		try {
 			if (c != null) c.close();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -119,7 +141,7 @@ class DevReporterImpl implements DevReporter {
 		try {
 			if (s != null) s.close();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/reporting/ReportingModule.java

@@ -1,10 +1,10 @@
 package org.briarproject.bramble.reporting;
 
-import org.briarproject.bramble.api.crypto.CryptoComponent;
-import org.briarproject.bramble.api.reporting.DevConfig;
+import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.reporting.DevReporter;
 
-import javax.net.SocketFactory;
+import javax.inject.Inject;
+import javax.inject.Singleton;
 
 import dagger.Module;
 import dagger.Provides;
@@ -12,9 +12,16 @@ import dagger.Provides;
 @Module
 public class ReportingModule {
 
+	public static class EagerSingletons {
+		@Inject
+		DevReporter devReporter;
+	}
+
 	@Provides
-	DevReporter provideDevReporter(CryptoComponent crypto,
-			DevConfig devConfig, SocketFactory torSocketFactory) {
-		return new DevReporterImpl(crypto, devConfig, torSocketFactory);
+	@Singleton
+	DevReporter provideDevReporter(DevReporterImpl devReporter,
+			EventBus eventBus) {
+		eventBus.addListener(devReporter);
+		return devReporter;
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/sync/DuplexOutgoingSession.java

@@ -23,6 +23,7 @@ import org.briarproject.bramble.api.sync.event.MessageSharedEvent;
 import org.briarproject.bramble.api.sync.event.MessageToAckEvent;
 import org.briarproject.bramble.api.sync.event.MessageToRequestEvent;
 import org.briarproject.bramble.api.system.Clock;
+import org.briarproject.bramble.api.transport.StreamWriter;
 
 import java.io.IOException;
 import java.util.Collection;
@@ -41,6 +42,7 @@ import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.STOPPING;
 import static org.briarproject.bramble.api.record.Record.MAX_RECORD_PAYLOAD_BYTES;
 import static org.briarproject.bramble.api.sync.SyncConstants.MAX_MESSAGE_IDS;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 /**
  * An outgoing {@link SyncSession} suitable for duplex transports. The session
@@ -67,6 +69,7 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 	private final Clock clock;
 	private final ContactId contactId;
 	private final int maxLatency, maxIdleTime;
+	private final StreamWriter streamWriter;
 	private final SyncRecordWriter recordWriter;
 	private final BlockingQueue<ThrowingRunnable<IOException>> writerTasks;
 
@@ -81,7 +84,8 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 
 	DuplexOutgoingSession(DatabaseComponent db, Executor dbExecutor,
 			EventBus eventBus, Clock clock, ContactId contactId, int maxLatency,
-			int maxIdleTime, SyncRecordWriter recordWriter) {
+			int maxIdleTime, StreamWriter streamWriter,
+			SyncRecordWriter recordWriter) {
 		this.db = db;
 		this.dbExecutor = dbExecutor;
 		this.eventBus = eventBus;
@@ -89,6 +93,7 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 		this.contactId = contactId;
 		this.maxLatency = maxLatency;
 		this.maxIdleTime = maxIdleTime;
+		this.streamWriter = streamWriter;
 		this.recordWriter = recordWriter;
 		writerTasks = new LinkedBlockingQueue<>();
 	}
@@ -149,7 +154,7 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 						dataToFlush = true;
 					}
 				}
-				if (dataToFlush) recordWriter.flush();
+				streamWriter.sendEndOfStream();
 			} catch (InterruptedException e) {
 				LOG.info("Interrupted while waiting for a record to write");
 				Thread.currentThread().interrupt();
@@ -236,7 +241,7 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 					LOG.info("Generated ack: " + (a != null));
 				if (a != null) writerTasks.add(new WriteAck(a));
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				interrupt();
 			}
 		}
@@ -283,7 +288,7 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 					LOG.info("Generated batch: " + (b != null));
 				if (b != null) writerTasks.add(new WriteBatch(b));
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				interrupt();
 			}
 		}
@@ -330,7 +335,7 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 					LOG.info("Generated offer: " + (o != null));
 				if (o != null) writerTasks.add(new WriteOffer(o));
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				interrupt();
 			}
 		}
@@ -375,7 +380,7 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 					LOG.info("Generated request: " + (r != null));
 				if (r != null) writerTasks.add(new WriteRequest(r));
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				interrupt();
 			}
 		}

bramble-core/src/main/java/org/briarproject/bramble/sync/IncomingSession.java

@@ -28,6 +28,7 @@ import javax.annotation.concurrent.ThreadSafe;
 
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.STOPPING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 /**
  * An incoming {@link SyncSession}.
@@ -63,7 +64,11 @@ class IncomingSession implements SyncSession, EventListener {
 		eventBus.addListener(this);
 		try {
 			// Read records until interrupted or EOF
-			while (!interrupted && !recordReader.eof()) {
+			while (!interrupted) {
+				if (recordReader.eof()) {
+					LOG.info("End of stream");
+					return;
+				}
 				if (recordReader.hasAck()) {
 					Ack a = recordReader.readAck();
 					dbExecutor.execute(new ReceiveAck(a));
@@ -123,7 +128,7 @@ class IncomingSession implements SyncSession, EventListener {
 					db.endTransaction(txn);
 				}
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				interrupt();
 			}
 		}
@@ -149,7 +154,7 @@ class IncomingSession implements SyncSession, EventListener {
 					db.endTransaction(txn);
 				}
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				interrupt();
 			}
 		}
@@ -175,7 +180,7 @@ class IncomingSession implements SyncSession, EventListener {
 					db.endTransaction(txn);
 				}
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				interrupt();
 			}
 		}
@@ -201,7 +206,7 @@ class IncomingSession implements SyncSession, EventListener {
 					db.endTransaction(txn);
 				}
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				interrupt();
 			}
 		}

bramble-core/src/main/java/org/briarproject/bramble/sync/SimplexOutgoingSession.java

@@ -15,6 +15,7 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.Ack;
 import org.briarproject.bramble.api.sync.SyncRecordWriter;
 import org.briarproject.bramble.api.sync.SyncSession;
+import org.briarproject.bramble.api.transport.StreamWriter;
 
 import java.io.IOException;
 import java.util.Collection;
@@ -31,6 +32,7 @@ import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.STOPPING;
 import static org.briarproject.bramble.api.record.Record.MAX_RECORD_PAYLOAD_BYTES;
 import static org.briarproject.bramble.api.sync.SyncConstants.MAX_MESSAGE_IDS;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 /**
  * An outgoing {@link SyncSession} suitable for simplex transports. The session
@@ -51,6 +53,7 @@ class SimplexOutgoingSession implements SyncSession, EventListener {
 	private final EventBus eventBus;
 	private final ContactId contactId;
 	private final int maxLatency;
+	private final StreamWriter streamWriter;
 	private final SyncRecordWriter recordWriter;
 	private final AtomicInteger outstandingQueries;
 	private final BlockingQueue<ThrowingRunnable<IOException>> writerTasks;
@@ -58,13 +61,14 @@ class SimplexOutgoingSession implements SyncSession, EventListener {
 	private volatile boolean interrupted = false;
 
 	SimplexOutgoingSession(DatabaseComponent db, Executor dbExecutor,
-			EventBus eventBus, ContactId contactId,
-			int maxLatency, SyncRecordWriter recordWriter) {
+			EventBus eventBus, ContactId contactId, int maxLatency,
+			StreamWriter streamWriter, SyncRecordWriter recordWriter) {
 		this.db = db;
 		this.dbExecutor = dbExecutor;
 		this.eventBus = eventBus;
 		this.contactId = contactId;
 		this.maxLatency = maxLatency;
+		this.streamWriter = streamWriter;
 		this.recordWriter = recordWriter;
 		outstandingQueries = new AtomicInteger(2); // One per type of record
 		writerTasks = new LinkedBlockingQueue<>();
@@ -85,7 +89,7 @@ class SimplexOutgoingSession implements SyncSession, EventListener {
 					if (task == CLOSE) break;
 					task.run();
 				}
-				recordWriter.flush();
+				streamWriter.sendEndOfStream();
 			} catch (InterruptedException e) {
 				LOG.info("Interrupted while waiting for a record to write");
 				Thread.currentThread().interrupt();
@@ -136,7 +140,7 @@ class SimplexOutgoingSession implements SyncSession, EventListener {
 				if (a == null) decrementOutstandingQueries();
 				else writerTasks.add(new WriteAck(a));
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				interrupt();
 			}
 		}
@@ -181,7 +185,7 @@ class SimplexOutgoingSession implements SyncSession, EventListener {
 				if (b == null) decrementOutstandingQueries();
 				else writerTasks.add(new WriteBatch(b));
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				interrupt();
 			}
 		}

bramble-core/src/main/java/org/briarproject/bramble/sync/SyncSessionFactoryImpl.java

@@ -12,6 +12,7 @@ import org.briarproject.bramble.api.sync.SyncRecordWriterFactory;
 import org.briarproject.bramble.api.sync.SyncSession;
 import org.briarproject.bramble.api.sync.SyncSessionFactory;
 import org.briarproject.bramble.api.system.Clock;
+import org.briarproject.bramble.api.transport.StreamWriter;
 
 import java.io.InputStream;
 import java.io.OutputStream;
@@ -53,19 +54,21 @@ class SyncSessionFactoryImpl implements SyncSessionFactory {
 
 	@Override
 	public SyncSession createSimplexOutgoingSession(ContactId c,
-			int maxLatency, OutputStream out) {
+			int maxLatency, StreamWriter streamWriter) {
+		OutputStream out = streamWriter.getOutputStream();
 		SyncRecordWriter recordWriter =
 				recordWriterFactory.createRecordWriter(out);
 		return new SimplexOutgoingSession(db, dbExecutor, eventBus, c,
-				maxLatency, recordWriter);
+				maxLatency, streamWriter, recordWriter);
 	}
 
 	@Override
 	public SyncSession createDuplexOutgoingSession(ContactId c, int maxLatency,
-			int maxIdleTime, OutputStream out) {
+			int maxIdleTime, StreamWriter streamWriter) {
+		OutputStream out = streamWriter.getOutputStream();
 		SyncRecordWriter recordWriter =
 				recordWriterFactory.createRecordWriter(out);
 		return new DuplexOutgoingSession(db, dbExecutor, eventBus, clock, c,
-				maxLatency, maxIdleTime, recordWriter);
+				maxLatency, maxIdleTime, streamWriter, recordWriter);
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/sync/ValidationManagerImpl.java

@@ -40,6 +40,7 @@ import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.sync.ValidationManager.State.DELIVERED;
 import static org.briarproject.bramble.api.sync.ValidationManager.State.INVALID;
 import static org.briarproject.bramble.api.sync.ValidationManager.State.PENDING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @ThreadSafe
 @NotNullByDefault
@@ -110,7 +111,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			}
 			validateNextMessageAsync(unvalidated);
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -144,7 +145,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			LOG.info("Group removed before validation");
 			validateNextMessageAsync(unvalidated);
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -165,7 +166,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			}
 			deliverNextPendingMessageAsync(pending);
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -231,7 +232,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			LOG.info("Group removed before delivery");
 			deliverNextPendingMessageAsync(pending);
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -252,8 +253,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 				storeMessageContextAsync(m, g.getClientId(),
 						g.getMajorVersion(), context);
 			} catch (InvalidMessageException e) {
-				if (LOG.isLoggable(INFO))
-					LOG.log(INFO, e.toString(), e);
+				logException(LOG, INFO, e);
 				Queue<MessageId> invalidate = new LinkedList<>();
 				invalidate.add(m.getId());
 				invalidateNextMessageAsync(invalidate);
@@ -326,7 +326,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 		} catch (NoSuchGroupException e) {
 			LOG.info("Group removed during validation");
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -377,7 +377,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			}
 			shareNextMessageAsync(toShare);
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -412,7 +412,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			LOG.info("Group removed before sharing");
 			shareNextMessageAsync(toShare);
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -440,7 +440,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			LOG.info("Message removed before invalidation");
 			invalidateNextMessageAsync(invalidate);
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -492,7 +492,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 		} catch (NoSuchGroupException e) {
 			LOG.info("Group removed before validation");
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/system/LinuxSecureRandomProvider.java

@@ -13,6 +13,7 @@ import java.util.logging.Logger;
 import javax.annotation.concurrent.Immutable;
 
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @Immutable
 @NotNullByDefault
@@ -49,7 +50,7 @@ class LinuxSecureRandomProvider extends AbstractSecureRandomProvider {
 			out.close();
 		} catch (IOException e) {
 			// On some devices /dev/urandom isn't writable - this isn't fatal
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/system/LinuxSecureRandomSpi.java

@@ -10,6 +10,7 @@ import java.security.SecureRandomSpi;
 import java.util.logging.Logger;
 
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 public class LinuxSecureRandomSpi extends SecureRandomSpi {
 
@@ -39,7 +40,7 @@ public class LinuxSecureRandomSpi extends SecureRandomSpi {
 			out.close();
 		} catch (IOException e) {
 			// On some devices /dev/urandom isn't writable - this isn't fatal
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/transport/KeyManagerImpl.java

@@ -99,39 +99,18 @@ class KeyManagerImpl implements KeyManager, Service, EventListener {
 	}
 
 	@Override
-	public void addContact(Transaction txn, ContactId c, SecretKey master,
-			long timestamp, boolean alice) throws DbException {
-		for (TransportKeyManager m : managers.values())
-			m.addContact(txn, c, master, timestamp, alice);
-	}
-
-	@Override
-	public Map<TransportId, KeySetId> addUnboundKeys(Transaction txn,
-			SecretKey master, long timestamp, boolean alice)
+	public Map<TransportId, KeySetId> addContact(Transaction txn, ContactId c,
+			SecretKey master, long timestamp, boolean alice, boolean active)
 			throws DbException {
 		Map<TransportId, KeySetId> ids = new HashMap<>();
 		for (Entry<TransportId, TransportKeyManager> e : managers.entrySet()) {
 			TransportId t = e.getKey();
 			TransportKeyManager m = e.getValue();
-			ids.put(t, m.addUnboundKeys(txn, master, timestamp, alice));
+			ids.put(t, m.addContact(txn, c, master, timestamp, alice, active));
 		}
 		return ids;
 	}
 
-	@Override
-	public void bindKeys(Transaction txn, ContactId c,
-			Map<TransportId, KeySetId> keys) throws DbException {
-		for (Entry<TransportId, KeySetId> e : keys.entrySet()) {
-			TransportId t = e.getKey();
-			TransportKeyManager m = managers.get(t);
-			if (m == null) {
-				if (LOG.isLoggable(INFO)) LOG.info("No key manager for " + t);
-			} else {
-				m.bindKeys(txn, c, e.getValue());
-			}
-		}
-	}
-
 	@Override
 	public void activateKeys(Transaction txn, Map<TransportId, KeySetId> keys)
 			throws DbException {
@@ -146,24 +125,10 @@ class KeyManagerImpl implements KeyManager, Service, EventListener {
 		}
 	}
 
-	@Override
-	public void removeKeys(Transaction txn, Map<TransportId, KeySetId> keys)
-			throws DbException {
-		for (Entry<TransportId, KeySetId> e : keys.entrySet()) {
-			TransportId t = e.getKey();
-			TransportKeyManager m = managers.get(t);
-			if (m == null) {
-				if (LOG.isLoggable(INFO)) LOG.info("No key manager for " + t);
-			} else {
-				m.removeKeys(txn, e.getValue());
-			}
-		}
-	}
-
 	@Override
 	public boolean canSendOutgoingStreams(ContactId c, TransportId t) {
 		TransportKeyManager m = managers.get(t);
-		return m == null ? false : m.canSendOutgoingStreams(c);
+		return m != null && m.canSendOutgoingStreams(c);
 	}
 
 	@Override

bramble-core/src/main/java/org/briarproject/bramble/transport/MutableKeySet.java

@@ -3,32 +3,28 @@ package org.briarproject.bramble.transport;
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.transport.KeySetId;
 
-import javax.annotation.Nullable;
-
-public class MutableKeySet {
+class MutableKeySet {
 
 	private final KeySetId keySetId;
-	@Nullable
 	private final ContactId contactId;
 	private final MutableTransportKeys transportKeys;
 
-	public MutableKeySet(KeySetId keySetId, @Nullable ContactId contactId,
+	MutableKeySet(KeySetId keySetId, ContactId contactId,
 			MutableTransportKeys transportKeys) {
 		this.keySetId = keySetId;
 		this.contactId = contactId;
 		this.transportKeys = transportKeys;
 	}
 
-	public KeySetId getKeySetId() {
+	KeySetId getKeySetId() {
 		return keySetId;
 	}
 
-	@Nullable
-	public ContactId getContactId() {
+	ContactId getContactId() {
 		return contactId;
 	}
 
-	public MutableTransportKeys getTransportKeys() {
+	MutableTransportKeys getTransportKeys() {
 		return transportKeys;
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/transport/StreamWriterFactoryImpl.java

@@ -4,6 +4,7 @@ import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.crypto.StreamEncrypterFactory;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.transport.StreamContext;
+import org.briarproject.bramble.api.transport.StreamWriter;
 import org.briarproject.bramble.api.transport.StreamWriterFactory;
 
 import java.io.OutputStream;
@@ -23,14 +24,14 @@ class StreamWriterFactoryImpl implements StreamWriterFactory {
 	}
 
 	@Override
-	public OutputStream createStreamWriter(OutputStream out,
+	public StreamWriter createStreamWriter(OutputStream out,
 			StreamContext ctx) {
 		return new StreamWriterImpl(
 				streamEncrypterFactory.createStreamEncrypter(out, ctx));
 	}
 
 	@Override
-	public OutputStream createContactExchangeStreamWriter(OutputStream out,
+	public StreamWriter createContactExchangeStreamWriter(OutputStream out,
 			SecretKey headerKey) {
 		return new StreamWriterImpl(
 				streamEncrypterFactory.createContactExchangeStreamDecrypter(out,

bramble-core/src/main/java/org/briarproject/bramble/transport/StreamWriterImpl.java

@@ -2,6 +2,7 @@ package org.briarproject.bramble.transport;
 
 import org.briarproject.bramble.api.crypto.StreamEncrypter;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.transport.StreamWriter;
 
 import java.io.IOException;
 import java.io.OutputStream;
@@ -17,7 +18,7 @@ import static org.briarproject.bramble.api.transport.TransportConstants.MAX_PAYL
  */
 @NotThreadSafe
 @NotNullByDefault
-class StreamWriterImpl extends OutputStream {
+class StreamWriterImpl extends OutputStream implements StreamWriter {
 
 	private final StreamEncrypter encrypter;
 	private final byte[] payload;
@@ -29,6 +30,17 @@ class StreamWriterImpl extends OutputStream {
 		payload = new byte[MAX_PAYLOAD_LENGTH];
 	}
 
+	@Override
+	public OutputStream getOutputStream() {
+		return this;
+	}
+
+	@Override
+	public void sendEndOfStream() throws IOException {
+		writeFrame(true);
+		encrypter.flush();
+	}
+
 	@Override
 	public void close() throws IOException {
 		writeFrame(true);

bramble-core/src/main/java/org/briarproject/bramble/transport/TransportKeyManager.java

@@ -15,18 +15,11 @@ interface TransportKeyManager {
 
 	void start(Transaction txn) throws DbException;
 
-	void addContact(Transaction txn, ContactId c, SecretKey master,
-			long timestamp, boolean alice) throws DbException;
-
-	KeySetId addUnboundKeys(Transaction txn, SecretKey master, long timestamp,
-			boolean alice) throws DbException;
-
-	void bindKeys(Transaction txn, ContactId c, KeySetId k) throws DbException;
+	KeySetId addContact(Transaction txn, ContactId c, SecretKey master,
+			long timestamp, boolean alice, boolean active) throws DbException;
 
 	void activateKeys(Transaction txn, KeySetId k) throws DbException;
 
-	void removeKeys(Transaction txn, KeySetId k) throws DbException;
-
 	void removeContact(ContactId c);
 
 	boolean canSendOutgoingStreams(ContactId c);

bramble-core/src/main/java/org/briarproject/bramble/transport/TransportKeyManagerImpl.java

@@ -28,7 +28,6 @@ import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.locks.ReentrantLock;
 import java.util.logging.Logger;
 
-import javax.annotation.Nullable;
 import javax.annotation.concurrent.ThreadSafe;
 
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
@@ -37,6 +36,7 @@ import static org.briarproject.bramble.api.transport.TransportConstants.MAX_CLOC
 import static org.briarproject.bramble.api.transport.TransportConstants.PROTOCOL_VERSION;
 import static org.briarproject.bramble.api.transport.TransportConstants.TAG_LENGTH;
 import static org.briarproject.bramble.util.ByteUtils.MAX_32_BIT_UNSIGNED;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @ThreadSafe
 @NotNullByDefault
@@ -119,16 +119,14 @@ class TransportKeyManagerImpl implements TransportKeyManager {
 	}
 
 	// Locking: lock
-	private void addKeys(KeySetId keySetId, @Nullable ContactId contactId,
+	private void addKeys(KeySetId keySetId, ContactId contactId,
 			MutableTransportKeys m) {
 		MutableKeySet ks = new MutableKeySet(keySetId, contactId, m);
 		keys.put(keySetId, ks);
-		if (contactId != null) {
-			encodeTags(keySetId, contactId, m.getPreviousIncomingKeys());
-			encodeTags(keySetId, contactId, m.getCurrentIncomingKeys());
-			encodeTags(keySetId, contactId, m.getNextIncomingKeys());
-			considerReplacingOutgoingKeys(ks);
-		}
+		encodeTags(keySetId, contactId, m.getPreviousIncomingKeys());
+		encodeTags(keySetId, contactId, m.getCurrentIncomingKeys());
+		encodeTags(keySetId, contactId, m.getNextIncomingKeys());
+		considerReplacingOutgoingKeys(ks);
 	}
 
 	// Locking: lock
@@ -150,8 +148,9 @@ class TransportKeyManagerImpl implements TransportKeyManager {
 		if (ks.getTransportKeys().getCurrentOutgoingKeys().isActive()) {
 			MutableKeySet old = outContexts.get(ks.getContactId());
 			if (old == null ||
-					old.getKeySetId().getInt() < ks.getKeySetId().getInt())
+					old.getKeySetId().getInt() < ks.getKeySetId().getInt()) {
 				outContexts.put(ks.getContactId(), ks);
+			}
 		}
 	}
 
@@ -171,26 +170,14 @@ class TransportKeyManagerImpl implements TransportKeyManager {
 					db.endTransaction(txn);
 				}
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}
 
 	@Override
-	public void addContact(Transaction txn, ContactId c, SecretKey master,
-			long timestamp, boolean alice) throws DbException {
-		deriveAndAddKeys(txn, c, master, timestamp, alice, true);
-	}
-
-	@Override
-	public KeySetId addUnboundKeys(Transaction txn, SecretKey master,
-			long timestamp, boolean alice) throws DbException {
-		return deriveAndAddKeys(txn, null, master, timestamp, alice, false);
-	}
-
-	private KeySetId deriveAndAddKeys(Transaction txn, @Nullable ContactId c,
-			SecretKey master, long timestamp, boolean alice, boolean active)
-			throws DbException {
+	public KeySetId addContact(Transaction txn, ContactId c, SecretKey master,
+			long timestamp, boolean alice, boolean active) throws DbException {
 		lock.lock();
 		try {
 			// Work out what rotation period the timestamp belongs to
@@ -211,31 +198,12 @@ class TransportKeyManagerImpl implements TransportKeyManager {
 		}
 	}
 
-	@Override
-	public void bindKeys(Transaction txn, ContactId c, KeySetId k)
-			throws DbException {
-		lock.lock();
-		try {
-			MutableKeySet ks = keys.get(k);
-			if (ks == null) throw new IllegalArgumentException();
-			// Check that the keys haven't already been bound
-			if (ks.getContactId() != null) throw new IllegalArgumentException();
-			MutableTransportKeys m = ks.getTransportKeys();
-			addKeys(k, c, m);
-			db.bindTransportKeys(txn, c, m.getTransportId(), k);
-		} finally {
-			lock.unlock();
-		}
-	}
-
 	@Override
 	public void activateKeys(Transaction txn, KeySetId k) throws DbException {
 		lock.lock();
 		try {
 			MutableKeySet ks = keys.get(k);
 			if (ks == null) throw new IllegalArgumentException();
-			// Check that the keys have been bound
-			if (ks.getContactId() == null) throw new IllegalArgumentException();
 			MutableTransportKeys m = ks.getTransportKeys();
 			m.getCurrentOutgoingKeys().activate();
 			considerReplacingOutgoingKeys(ks);
@@ -245,21 +213,6 @@ class TransportKeyManagerImpl implements TransportKeyManager {
 		}
 	}
 
-	@Override
-	public void removeKeys(Transaction txn, KeySetId k) throws DbException {
-		lock.lock();
-		try {
-			MutableKeySet ks = keys.remove(k);
-			if (ks == null) throw new IllegalArgumentException();
-			// Check that the keys haven't been bound
-			if (ks.getContactId() != null) throw new IllegalArgumentException();
-			TransportId t = ks.getTransportKeys().getTransportId();
-			db.removeTransportKeys(txn, t, k);
-		} finally {
-			lock.unlock();
-		}
-	}
-
 	@Override
 	public void removeContact(ContactId c) {
 		lock.lock();

bramble-core/src/test/java/org/briarproject/bramble/contact/ContactManagerImplTest.java

@@ -55,8 +55,8 @@ public class ContactManagerImplTest extends BrambleMockTestCase {
 			will(returnValue(txn));
 			oneOf(db).addContact(txn, remote, local, verified, active);
 			will(returnValue(contactId));
-			oneOf(keyManager)
-					.addContact(txn, contactId, master, timestamp, alice);
+			oneOf(keyManager).addContact(txn, contactId, master, timestamp,
+					alice, active);
 			oneOf(db).getContact(txn, contactId);
 			will(returnValue(contact));
 			oneOf(db).commitTransaction(txn);

bramble-core/src/test/java/org/briarproject/bramble/data/BdfReaderImplTest.java

@@ -4,13 +4,16 @@ import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.api.data.BdfDictionary;
 import org.briarproject.bramble.api.data.BdfList;
 import org.briarproject.bramble.test.BrambleTestCase;
-import org.briarproject.bramble.util.StringUtils;
 import org.junit.Test;
 
 import java.io.ByteArrayInputStream;
 
 import static org.briarproject.bramble.api.data.BdfDictionary.NULL_VALUE;
+import static org.briarproject.bramble.api.data.BdfReader.DEFAULT_MAX_BUFFER_SIZE;
 import static org.briarproject.bramble.data.BdfReaderImpl.DEFAULT_NESTED_LIMIT;
+import static org.briarproject.bramble.util.StringUtils.fromHexString;
+import static org.briarproject.bramble.util.StringUtils.getRandomString;
+import static org.briarproject.bramble.util.StringUtils.toHexString;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
@@ -158,30 +161,32 @@ public class BdfReaderImplTest extends BrambleTestCase {
 
 	@Test
 	public void testReadString8() throws Exception {
-		String longest = StringUtils.getRandomString(Byte.MAX_VALUE);
-		String longHex = StringUtils.toHexString(longest.getBytes("UTF-8"));
+		String longest = getRandomString(Byte.MAX_VALUE);
+		String longHex = toHexString(longest.getBytes("UTF-8"));
 		// "foo", the empty string, and 127 random letters
 		setContents("41" + "03" + "666F6F" + "41" + "00" +
 				"41" + "7F" + longHex);
-		assertEquals("foo", r.readString(Integer.MAX_VALUE));
-		assertEquals("", r.readString(Integer.MAX_VALUE));
-		assertEquals(longest, r.readString(Integer.MAX_VALUE));
+		assertEquals("foo", r.readString());
+		assertEquals("", r.readString());
+		assertEquals(longest, r.readString());
 		assertTrue(r.eof());
 	}
 
 	@Test(expected = FormatException.class)
 	public void testReadString8ChecksMaxLength() throws Exception {
-		// "foo" twice
-		setContents("41" + "03" + "666F6F" + "41" + "03" + "666F6F");
-		assertEquals("foo", r.readString(3));
+		int maxBufferSize = 3;
+		// "foo", "fooo"
+		setContents("41" + "03" + "666F6F"
+				+ "41" + "04" + "666F6F6F", maxBufferSize);
+		assertEquals("foo", r.readString());
 		assertTrue(r.hasString());
-		r.readString(2);
+		r.readString();
 	}
 
 	@Test
 	public void testSkipString8() throws Exception {
-		String longest = StringUtils.getRandomString(Byte.MAX_VALUE);
-		String longHex = StringUtils.toHexString(longest.getBytes("UTF-8"));
+		String longest = getRandomString(Byte.MAX_VALUE);
+		String longHex = toHexString(longest.getBytes("UTF-8"));
 		// "foo", the empty string, and 127 random letters
 		setContents("41" + "03" + "666F6F" + "41" + "00" +
 				"41" + "7F" + longHex);
@@ -193,34 +198,37 @@ public class BdfReaderImplTest extends BrambleTestCase {
 
 	@Test
 	public void testReadString16() throws Exception {
-		String shortest = StringUtils.getRandomString(Byte.MAX_VALUE + 1);
-		String shortHex = StringUtils.toHexString(shortest.getBytes("UTF-8"));
-		String longest = StringUtils.getRandomString(Short.MAX_VALUE);
-		String longHex = StringUtils.toHexString(longest.getBytes("UTF-8"));
+		String shortest = getRandomString(Byte.MAX_VALUE + 1);
+		String shortHex = toHexString(shortest.getBytes("UTF-8"));
+		String longest = getRandomString(Short.MAX_VALUE);
+		String longHex = toHexString(longest.getBytes("UTF-8"));
 		// 128 random letters and 2^15 -1 random letters
 		setContents("42" + "0080" + shortHex + "42" + "7FFF" + longHex);
-		assertEquals(shortest, r.readString(Integer.MAX_VALUE));
-		assertEquals(longest, r.readString(Integer.MAX_VALUE));
+		assertEquals(shortest, r.readString());
+		assertEquals(longest, r.readString());
 		assertTrue(r.eof());
 	}
 
 	@Test(expected = FormatException.class)
 	public void testReadString16ChecksMaxLength() throws Exception {
-		String shortest = StringUtils.getRandomString(Byte.MAX_VALUE + 1);
-		String shortHex = StringUtils.toHexString(shortest.getBytes("UTF-8"));
-		// 128 random letters, twice
-		setContents("42" + "0080" + shortHex + "42" + "0080" + shortHex);
-		assertEquals(shortest, r.readString(Byte.MAX_VALUE + 1));
+		int maxBufferSize = Byte.MAX_VALUE + 1;
+		String valid = getRandomString(Byte.MAX_VALUE + 1);
+		String validHex = toHexString(valid.getBytes("UTF-8"));
+		String invalidhex = validHex + "20";
+		// 128 random letters, the same plus a space
+		setContents("42" + "0080" + validHex
+				+ "42" + "0081" + invalidhex, maxBufferSize);
+		assertEquals(valid, r.readString());
 		assertTrue(r.hasString());
-		r.readString(Byte.MAX_VALUE);
+		r.readString();
 	}
 
 	@Test
 	public void testSkipString16() throws Exception {
-		String shortest = StringUtils.getRandomString(Byte.MAX_VALUE + 1);
-		String shortHex = StringUtils.toHexString(shortest.getBytes("UTF-8"));
-		String longest = StringUtils.getRandomString(Short.MAX_VALUE);
-		String longHex = StringUtils.toHexString(longest.getBytes("UTF-8"));
+		String shortest = getRandomString(Byte.MAX_VALUE + 1);
+		String shortHex = toHexString(shortest.getBytes("UTF-8"));
+		String longest = getRandomString(Short.MAX_VALUE);
+		String longHex = toHexString(longest.getBytes("UTF-8"));
 		// 128 random letters and 2^15 - 1 random letters
 		setContents("42" + "0080" + shortHex + "42" + "7FFF" + longHex);
 		r.skipString();
@@ -230,30 +238,32 @@ public class BdfReaderImplTest extends BrambleTestCase {
 
 	@Test
 	public void testReadString32() throws Exception {
-		String shortest = StringUtils.getRandomString(Short.MAX_VALUE + 1);
-		String shortHex = StringUtils.toHexString(shortest.getBytes("UTF-8"));
+		String shortest = getRandomString(Short.MAX_VALUE + 1);
+		String shortHex = toHexString(shortest.getBytes("UTF-8"));
 		// 2^15 random letters
 		setContents("44" + "00008000" + shortHex);
-		assertEquals(shortest, r.readString(Integer.MAX_VALUE));
+		assertEquals(shortest, r.readString());
 		assertTrue(r.eof());
 	}
 
 	@Test(expected = FormatException.class)
 	public void testReadString32ChecksMaxLength() throws Exception {
-		String shortest = StringUtils.getRandomString(Short.MAX_VALUE + 1);
-		String shortHex = StringUtils.toHexString(shortest.getBytes("UTF-8"));
-		// 2^15 random letters, twice
-		setContents("44" + "00008000" + shortHex +
-				"44" + "00008000" + shortHex);
-		assertEquals(shortest, r.readString(Short.MAX_VALUE + 1));
+		int maxBufferSize = Short.MAX_VALUE + 1;
+		String valid = getRandomString(maxBufferSize);
+		String validHex = toHexString(valid.getBytes("UTF-8"));
+		String invalidHex = validHex + "20";
+		// 2^15 random letters, the same plus a space
+		setContents("44" + "00008000" + validHex +
+				"44" + "00008001" + invalidHex, maxBufferSize);
+		assertEquals(valid, r.readString());
 		assertTrue(r.hasString());
-		r.readString(Short.MAX_VALUE);
+		r.readString();
 	}
 
 	@Test
 	public void testSkipString32() throws Exception {
-		String shortest = StringUtils.getRandomString(Short.MAX_VALUE + 1);
-		String shortHex = StringUtils.toHexString(shortest.getBytes("UTF-8"));
+		String shortest = getRandomString(Short.MAX_VALUE + 1);
+		String shortHex = toHexString(shortest.getBytes("UTF-8"));
 		// 2^15 random letters, twice
 		setContents("44" + "00008000" + shortHex +
 				"44" + "00008000" + shortHex);
@@ -265,41 +275,43 @@ public class BdfReaderImplTest extends BrambleTestCase {
 	@Test
 	public void testReadUtf8String() throws Exception {
 		String unicode = "\uFDD0\uFDD1\uFDD2\uFDD3";
-		String hex = StringUtils.toHexString(unicode.getBytes("UTF-8"));
+		String hex = toHexString(unicode.getBytes("UTF-8"));
 		// STRING_8 tag, "foo", the empty string, and the test string
 		setContents("41" + "03" + "666F6F" + "41" + "00" + "41" + "0C" + hex);
-		assertEquals("foo", r.readString(Integer.MAX_VALUE));
-		assertEquals("", r.readString(Integer.MAX_VALUE));
-		assertEquals(unicode, r.readString(Integer.MAX_VALUE));
+		assertEquals("foo", r.readString());
+		assertEquals("", r.readString());
+		assertEquals(unicode, r.readString());
 		assertTrue(r.eof());
 	}
 
 	@Test
 	public void testReadRaw8() throws Exception {
 		byte[] longest = new byte[Byte.MAX_VALUE];
-		String longHex = StringUtils.toHexString(longest);
+		String longHex = toHexString(longest);
 		// {1, 2, 3}, {}, and 127 zero bytes
 		setContents("51" + "03" + "010203" + "51" + "00" +
 				"51" + "7F" + longHex);
-		assertArrayEquals(new byte[] {1, 2, 3}, r.readRaw(Integer.MAX_VALUE));
-		assertArrayEquals(new byte[0], r.readRaw(Integer.MAX_VALUE));
-		assertArrayEquals(longest, r.readRaw(Integer.MAX_VALUE));
+		assertArrayEquals(new byte[] {1, 2, 3}, r.readRaw());
+		assertArrayEquals(new byte[0], r.readRaw());
+		assertArrayEquals(longest, r.readRaw());
 		assertTrue(r.eof());
 	}
 
 	@Test(expected = FormatException.class)
 	public void testReadRaw8ChecksMaxLength() throws Exception {
-		// {1, 2, 3} twice
-		setContents("51" + "03" + "010203" + "51" + "03" + "010203");
-		assertArrayEquals(new byte[] {1, 2, 3}, r.readRaw(3));
+		int maxBufferSize = 3;
+		// {1, 2, 3}, {1, 2, 3, 4}
+		setContents("51" + "03" + "010203" + "51" + "04" + "01020304",
+				maxBufferSize);
+		assertArrayEquals(new byte[] {1, 2, 3}, r.readRaw());
 		assertTrue(r.hasRaw());
-		r.readRaw(2);
+		r.readRaw();
 	}
 
 	@Test
 	public void testSkipRaw8() throws Exception {
 		byte[] longest = new byte[Byte.MAX_VALUE];
-		String longHex = StringUtils.toHexString(longest);
+		String longHex = toHexString(longest);
 		// {1, 2, 3}, {}, and 127 zero bytes
 		setContents("51" + "03" + "010203" + "51" + "00" +
 				"51" + "7F" + longHex);
@@ -312,33 +324,36 @@ public class BdfReaderImplTest extends BrambleTestCase {
 	@Test
 	public void testReadRaw16() throws Exception {
 		byte[] shortest = new byte[Byte.MAX_VALUE + 1];
-		String shortHex = StringUtils.toHexString(shortest);
+		String shortHex = toHexString(shortest);
 		byte[] longest = new byte[Short.MAX_VALUE];
-		String longHex = StringUtils.toHexString(longest);
+		String longHex = toHexString(longest);
 		// 128 zero bytes and 2^15 - 1 zero bytes
 		setContents("52" + "0080" + shortHex + "52" + "7FFF" + longHex);
-		assertArrayEquals(shortest, r.readRaw(Integer.MAX_VALUE));
-		assertArrayEquals(longest, r.readRaw(Integer.MAX_VALUE));
+		assertArrayEquals(shortest, r.readRaw());
+		assertArrayEquals(longest, r.readRaw());
 		assertTrue(r.eof());
 	}
 
 	@Test(expected = FormatException.class)
 	public void testReadRaw16ChecksMaxLength() throws Exception {
-		byte[] shortest = new byte[Byte.MAX_VALUE + 1];
-		String shortHex = StringUtils.toHexString(shortest);
-		// 128 zero bytes, twice
-		setContents("52" + "0080" + shortHex + "52" + "0080" + shortHex);
-		assertArrayEquals(shortest, r.readRaw(Byte.MAX_VALUE + 1));
+		int maxBufferSize = Byte.MAX_VALUE + 1;
+		byte[] valid = new byte[maxBufferSize];
+		String validHex = toHexString(valid);
+		String invalidHex = validHex + "00";
+		// 128 zero bytes, 129 zero bytes
+		setContents("52" + "0080" + validHex
+				+ "52" + "0081" + invalidHex, maxBufferSize);
+		assertArrayEquals(valid, r.readRaw());
 		assertTrue(r.hasRaw());
-		r.readRaw(Byte.MAX_VALUE);
+		r.readRaw();
 	}
 
 	@Test
 	public void testSkipRaw16() throws Exception {
 		byte[] shortest = new byte[Byte.MAX_VALUE + 1];
-		String shortHex = StringUtils.toHexString(shortest);
+		String shortHex = toHexString(shortest);
 		byte[] longest = new byte[Short.MAX_VALUE];
-		String longHex = StringUtils.toHexString(longest);
+		String longHex = toHexString(longest);
 		// 128 zero bytes and 2^15 - 1 zero bytes
 		setContents("52" + "0080" + shortHex + "52" + "7FFF" + longHex);
 		r.skipRaw();
@@ -349,29 +364,31 @@ public class BdfReaderImplTest extends BrambleTestCase {
 	@Test
 	public void testReadRaw32() throws Exception {
 		byte[] shortest = new byte[Short.MAX_VALUE + 1];
-		String shortHex = StringUtils.toHexString(shortest);
+		String shortHex = toHexString(shortest);
 		// 2^15 zero bytes
 		setContents("54" + "00008000" + shortHex);
-		assertArrayEquals(shortest, r.readRaw(Integer.MAX_VALUE));
+		assertArrayEquals(shortest, r.readRaw());
 		assertTrue(r.eof());
 	}
 
 	@Test(expected = FormatException.class)
 	public void testReadRaw32ChecksMaxLength() throws Exception {
-		byte[] shortest = new byte[Short.MAX_VALUE + 1];
-		String shortHex = StringUtils.toHexString(shortest);
-		// 2^15 zero bytes, twice
-		setContents("54" + "00008000" + shortHex +
-				"54" + "00008000" + shortHex);
-		assertArrayEquals(shortest, r.readRaw(Short.MAX_VALUE + 1));
+		int maxBufferSize = Short.MAX_VALUE + 1;
+		byte[] valid = new byte[maxBufferSize];
+		String validHex = toHexString(valid);
+		String invalidHex = validHex + "00";
+		// 2^15 zero bytes, 2^15 + 1 zero bytes
+		setContents("54" + "00008000" + validHex +
+				"54" + "00008001" + invalidHex, maxBufferSize);
+		assertArrayEquals(valid, r.readRaw());
 		assertTrue(r.hasRaw());
-		r.readRaw(Short.MAX_VALUE);
+		r.readRaw();
 	}
 
 	@Test
 	public void testSkipRaw32() throws Exception {
 		byte[] shortest = new byte[Short.MAX_VALUE + 1];
-		String shortHex = StringUtils.toHexString(shortest);
+		String shortHex = toHexString(shortest);
 		// 2^15 zero bytes, twice
 		setContents("54" + "00008000" + shortHex +
 				"54" + "00008000" + shortHex);
@@ -393,6 +410,30 @@ public class BdfReaderImplTest extends BrambleTestCase {
 		assertEquals(NULL_VALUE, list.get(2));
 	}
 
+	@Test(expected = FormatException.class)
+	public void testReadListChecksMaxLengthForString() throws Exception {
+		// A list containing "foo", a list containing "fooo"
+		setContents("60" + "41" + "03" + "666F6F" + "80"
+				+ "60" + "41" + "04" + "666F6F6F" + "80", 3);
+		BdfList list = r.readList();
+		assertEquals(1, list.size());
+		assertEquals("foo", list.get(0));
+		assertTrue(r.hasList());
+		r.readList();
+	}
+
+	@Test(expected = FormatException.class)
+	public void testReadListChecksMaxLengthForRaw() throws Exception {
+		// A list containing {1, 2, 3}, a list containing {1, 2, 3, 4}
+		setContents("60" + "51" + "03" + "010203" + "80"
+				+ "60" + "51" + "04" + "01020304" + "80", 3);
+		BdfList list = r.readList();
+		assertEquals(1, list.size());
+		assertArrayEquals(new byte[] {1, 2, 3}, (byte[]) list.get(0));
+		assertTrue(r.hasList());
+		r.readList();
+	}
+
 	@Test
 	public void testReadListManually() throws Exception {
 		// A list containing 1, "foo", and null
@@ -403,7 +444,7 @@ public class BdfReaderImplTest extends BrambleTestCase {
 		assertFalse(r.hasListEnd());
 		assertEquals(1, r.readLong());
 		assertFalse(r.hasListEnd());
-		assertEquals("foo", r.readString(1000));
+		assertEquals("foo", r.readString());
 		assertFalse(r.hasListEnd());
 		assertTrue(r.hasNull());
 		r.readNull();
@@ -435,6 +476,47 @@ public class BdfReaderImplTest extends BrambleTestCase {
 		assertEquals(NULL_VALUE, dictionary.get("bar"));
 	}
 
+	@Test(expected = FormatException.class)
+	public void testReadDictionaryChecksMaxLengthForKey() throws Exception {
+		// A dictionary containing "foo" -> null, a dictionary containing
+		// "fooo" -> null
+		setContents("70" + "41" + "03" + "666F6F" + "00" + "80"
+				+ "70" + "41" + "04" + "666F6F6F" + "00" + "80", 3);
+		BdfDictionary dictionary = r.readDictionary();
+		assertEquals(1, dictionary.size());
+		assertEquals(NULL_VALUE, dictionary.get("foo"));
+		assertTrue(r.hasDictionary());
+		r.readDictionary();
+	}
+
+	@Test(expected = FormatException.class)
+	public void testReadDictionaryChecksMaxLengthForString() throws Exception {
+		// A dictionary containing "foo" -> "bar", a dictionary containing
+		// "foo" -> "baar"
+		String foo = "41" + "03" + "666F6F";
+		setContents("70" + foo + "41" + "03" + "626172" + "80"
+				+ "70" + foo + "41" + "04" + "62616172" + "80", 3);
+		BdfDictionary dictionary = r.readDictionary();
+		assertEquals(1, dictionary.size());
+		assertEquals("bar", dictionary.get("foo"));
+		assertTrue(r.hasDictionary());
+		r.readDictionary();
+	}
+
+	@Test(expected = FormatException.class)
+	public void testReadDictionaryChecksMaxLengthForRaw() throws Exception {
+		// A dictionary containing "foo" -> {1, 2, 3}, a dictionary containing
+		// "foo" -> {1, 2, 3, 4}
+		String foo = "41" + "03" + "666F6F";
+		setContents("70" + foo + "51" + "03" + "010203" + "80"
+				+ "70" + foo + "51" + "04" + "01020304" + "80", 3);
+		BdfDictionary dictionary = r.readDictionary();
+		assertEquals(1, dictionary.size());
+		assertArrayEquals(new byte[] {1, 2, 3}, (byte[]) dictionary.get("foo"));
+		assertTrue(r.hasDictionary());
+		r.readDictionary();
+	}
+
 	@Test
 	public void testReadDictionaryManually() throws Exception {
 		// A dictionary containing "foo" -> 123 and "bar" -> null
@@ -442,11 +524,11 @@ public class BdfReaderImplTest extends BrambleTestCase {
 				"41" + "03" + "626172" + "00" + "80");
 		r.readDictionaryStart();
 		assertFalse(r.hasDictionaryEnd());
-		assertEquals("foo", r.readString(1000));
+		assertEquals("foo", r.readString());
 		assertFalse(r.hasDictionaryEnd());
 		assertEquals(123, r.readLong());
 		assertFalse(r.hasDictionaryEnd());
-		assertEquals("bar", r.readString(1000));
+		assertEquals("bar", r.readString());
 		assertFalse(r.hasDictionaryEnd());
 		assertTrue(r.hasNull());
 		r.readNull();
@@ -537,8 +619,11 @@ public class BdfReaderImplTest extends BrambleTestCase {
 	}
 
 	private void setContents(String hex) {
-		ByteArrayInputStream in = new ByteArrayInputStream(
-				StringUtils.fromHexString(hex));
-		r = new BdfReaderImpl(in, DEFAULT_NESTED_LIMIT);
+		setContents(hex, DEFAULT_MAX_BUFFER_SIZE);
+	}
+
+	private void setContents(String hex, int maxBufferSize) {
+		ByteArrayInputStream in = new ByteArrayInputStream(fromHexString(hex));
+		r = new BdfReaderImpl(in, DEFAULT_NESTED_LIMIT, maxBufferSize);
 	}
 }

bramble-core/src/test/java/org/briarproject/bramble/db/DatabaseComponentImplTest.java

@@ -289,11 +289,11 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 			throws Exception {
 		context.checking(new Expectations() {{
 			// Check whether the contact is in the DB (which it's not)
-			exactly(17).of(database).startTransaction();
+			exactly(16).of(database).startTransaction();
 			will(returnValue(txn));
-			exactly(17).of(database).containsContact(txn, contactId);
+			exactly(16).of(database).containsContact(txn, contactId);
 			will(returnValue(false));
-			exactly(17).of(database).abortTransaction(txn);
+			exactly(16).of(database).abortTransaction(txn);
 		}});
 		DatabaseComponent db = createDatabaseComponent(database, eventBus,
 				shutdown);
@@ -308,16 +308,6 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 			db.endTransaction(transaction);
 		}
 
-		transaction = db.startTransaction(false);
-		try {
-			db.bindTransportKeys(transaction, contactId, transportId, keySetId);
-			fail();
-		} catch (NoSuchContactException expected) {
-			// Expected
-		} finally {
-			db.endTransaction(transaction);
-		}
-
 		transaction = db.startTransaction(false);
 		try {
 			db.generateAck(transaction, contactId, 123);
@@ -773,13 +763,11 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 			// endTransaction()
 			oneOf(database).commitTransaction(txn);
 			// Check whether the transport is in the DB (which it's not)
-			exactly(6).of(database).startTransaction();
+			exactly(5).of(database).startTransaction();
 			will(returnValue(txn));
-			oneOf(database).containsContact(txn, contactId);
-			will(returnValue(true));
-			exactly(6).of(database).containsTransport(txn, transportId);
+			exactly(5).of(database).containsTransport(txn, transportId);
 			will(returnValue(false));
-			exactly(6).of(database).abortTransaction(txn);
+			exactly(5).of(database).abortTransaction(txn);
 		}});
 		DatabaseComponent db = createDatabaseComponent(database, eventBus,
 				shutdown);
@@ -794,16 +782,6 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 			db.endTransaction(transaction);
 		}
 
-		transaction = db.startTransaction(false);
-		try {
-			db.bindTransportKeys(transaction, contactId, transportId, keySetId);
-			fail();
-		} catch (NoSuchTransportException expected) {
-			// Expected
-		} finally {
-			db.endTransaction(transaction);
-		}
-
 		transaction = db.startTransaction(false);
 		try {
 			db.getTransportKeys(transaction, transportId);

bramble-core/src/test/java/org/briarproject/bramble/db/JdbcDatabaseTest.java

@@ -94,6 +94,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 	private final TransportId transportId;
 	private final ContactId contactId;
 	private final KeySetId keySetId, keySetId1;
+	private final Random random = new Random();
 
 	JdbcDatabaseTest() throws Exception {
 		clientId = getClientId();
@@ -670,8 +671,9 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 	@Test
 	public void testTransportKeys() throws Exception {
 		long rotationPeriod = 123, rotationPeriod1 = 234;
-		TransportKeys keys = createTransportKeys(rotationPeriod);
-		TransportKeys keys1 = createTransportKeys(rotationPeriod1);
+		boolean active = random.nextBoolean();
+		TransportKeys keys = createTransportKeys(rotationPeriod, active);
+		TransportKeys keys1 = createTransportKeys(rotationPeriod1, active);
 
 		Database<Connection> db = open(false);
 		Connection txn = db.startTransaction();
@@ -682,7 +684,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 		// Add the contact, the transport and the transport keys
 		db.addLocalAuthor(txn, localAuthor);
 		assertEquals(contactId, db.addContact(txn, author, localAuthor.getId(),
-				true, true));
+				true, active));
 		db.addTransport(txn, transportId, 123);
 		assertEquals(keySetId, db.addTransportKeys(txn, contactId, keys));
 		assertEquals(keySetId1, db.addTransportKeys(txn, contactId, keys1));
@@ -701,8 +703,9 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 		}
 
 		// Rotate the transport keys
-		TransportKeys rotated = createTransportKeys(rotationPeriod + 1);
-		TransportKeys rotated1 = createTransportKeys(rotationPeriod1 + 1);
+		TransportKeys rotated = createTransportKeys(rotationPeriod + 1, active);
+		TransportKeys rotated1 =
+				createTransportKeys(rotationPeriod1 + 1, active);
 		db.updateTransportKeys(txn, new KeySet(keySetId, contactId, rotated));
 		db.updateTransportKeys(txn, new KeySet(keySetId1, contactId, rotated1));
 
@@ -727,95 +730,6 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 		db.close();
 	}
 
-	@Test
-	public void testUnboundTransportKeys() throws Exception {
-		long rotationPeriod = 123, rotationPeriod1 = 234;
-		TransportKeys keys = createTransportKeys(rotationPeriod);
-		TransportKeys keys1 = createTransportKeys(rotationPeriod1);
-
-		Database<Connection> db = open(false);
-		Connection txn = db.startTransaction();
-
-		// Initially there should be no transport keys in the database
-		assertEquals(emptyList(), db.getTransportKeys(txn, transportId));
-
-		// Add the contact, the transport and the unbound transport keys
-		db.addLocalAuthor(txn, localAuthor);
-		assertEquals(contactId, db.addContact(txn, author, localAuthor.getId(),
-				true, true));
-		db.addTransport(txn, transportId, 123);
-		assertEquals(keySetId, db.addTransportKeys(txn, null, keys));
-		assertEquals(keySetId1, db.addTransportKeys(txn, null, keys1));
-
-		// Retrieve the transport keys
-		Collection<KeySet> allKeys = db.getTransportKeys(txn, transportId);
-		assertEquals(2, allKeys.size());
-		for (KeySet ks : allKeys) {
-			assertNull(ks.getContactId());
-			if (ks.getKeySetId().equals(keySetId)) {
-				assertKeysEquals(keys, ks.getTransportKeys());
-			} else {
-				assertEquals(keySetId1, ks.getKeySetId());
-				assertKeysEquals(keys1, ks.getTransportKeys());
-			}
-		}
-
-		// Bind the first set of transport keys
-		db.bindTransportKeys(txn, contactId, transportId, keySetId);
-
-		// Retrieve the keys again - the first set should be bound
-		allKeys = db.getTransportKeys(txn, transportId);
-		assertEquals(2, allKeys.size());
-		for (KeySet ks : allKeys) {
-			if (ks.getKeySetId().equals(keySetId)) {
-				assertEquals(contactId, ks.getContactId());
-				assertKeysEquals(keys, ks.getTransportKeys());
-			} else {
-				assertEquals(keySetId1, ks.getKeySetId());
-				assertNull(ks.getContactId());
-				assertKeysEquals(keys1, ks.getTransportKeys());
-			}
-		}
-
-		// Rotate the transport keys
-		TransportKeys rotated = createTransportKeys(rotationPeriod + 1);
-		TransportKeys rotated1 = createTransportKeys(rotationPeriod1 + 1);
-		db.updateTransportKeys(txn, new KeySet(keySetId, contactId, rotated));
-		db.updateTransportKeys(txn, new KeySet(keySetId1, null, rotated1));
-
-		// Retrieve the transport keys again
-		allKeys = db.getTransportKeys(txn, transportId);
-		assertEquals(2, allKeys.size());
-		for (KeySet ks : allKeys) {
-			if (ks.getKeySetId().equals(keySetId)) {
-				assertEquals(contactId, ks.getContactId());
-				assertKeysEquals(rotated, ks.getTransportKeys());
-			} else {
-				assertEquals(keySetId1, ks.getKeySetId());
-				assertNull(ks.getContactId());
-				assertKeysEquals(rotated1, ks.getTransportKeys());
-			}
-		}
-
-		// Remove the unbound transport keys
-		db.removeTransportKeys(txn, transportId, keySetId1);
-
-		// Retrieve the keys again - the second set should be gone
-		allKeys = db.getTransportKeys(txn, transportId);
-		assertEquals(1, allKeys.size());
-		KeySet ks = allKeys.iterator().next();
-		assertEquals(keySetId, ks.getKeySetId());
-		assertEquals(contactId, ks.getContactId());
-		assertKeysEquals(rotated, ks.getTransportKeys());
-
-		// Removing the transport should remove the remaining transport keys
-		db.removeTransport(txn, transportId);
-		assertEquals(emptyList(), db.getTransportKeys(txn, transportId));
-
-		db.commitTransaction(txn);
-		db.close();
-	}
-
 	private void assertKeysEquals(TransportKeys expected,
 			TransportKeys actual) {
 		assertEquals(expected.getTransportId(), actual.getTransportId());
@@ -853,7 +767,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 	@Test
 	public void testIncrementStreamCounter() throws Exception {
 		long rotationPeriod = 123;
-		TransportKeys keys = createTransportKeys(rotationPeriod);
+		TransportKeys keys = createTransportKeys(rotationPeriod, true);
 		long streamCounter = keys.getCurrentOutgoingKeys().getStreamCounter();
 
 		Database<Connection> db = open(false);
@@ -893,8 +807,9 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 
 	@Test
 	public void testSetReorderingWindow() throws Exception {
+		boolean active = random.nextBoolean();
 		long rotationPeriod = 123;
-		TransportKeys keys = createTransportKeys(rotationPeriod);
+		TransportKeys keys = createTransportKeys(rotationPeriod, active);
 		long base = keys.getCurrentIncomingKeys().getWindowBase();
 		byte[] bitmap = keys.getCurrentIncomingKeys().getWindowBitmap();
 
@@ -904,12 +819,12 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 		// Add the contact, transport and transport keys
 		db.addLocalAuthor(txn, localAuthor);
 		assertEquals(contactId, db.addContact(txn, author, localAuthor.getId(),
-				true, true));
+				true, active));
 		db.addTransport(txn, transportId, 123);
 		assertEquals(keySetId, db.addTransportKeys(txn, contactId, keys));
 
 		// Update the reordering window and retrieve the transport keys
-		new Random().nextBytes(bitmap);
+		random.nextBytes(bitmap);
 		db.setReorderingWindow(txn, keySetId, transportId, rotationPeriod,
 				base + 1, bitmap);
 		Collection<KeySet> newKeys = db.getTransportKeys(txn, transportId);
@@ -1908,7 +1823,8 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 		return db;
 	}
 
-	private TransportKeys createTransportKeys(long rotationPeriod) {
+	private TransportKeys createTransportKeys(long rotationPeriod,
+			boolean active) {
 		SecretKey inPrevTagKey = getSecretKey();
 		SecretKey inPrevHeaderKey = getSecretKey();
 		IncomingKeys inPrev = new IncomingKeys(inPrevTagKey, inPrevHeaderKey,
@@ -1924,7 +1840,7 @@ public abstract class JdbcDatabaseTest extends BrambleTestCase {
 		SecretKey outCurrTagKey = getSecretKey();
 		SecretKey outCurrHeaderKey = getSecretKey();
 		OutgoingKeys outCurr = new OutgoingKeys(outCurrTagKey, outCurrHeaderKey,
-				rotationPeriod, 456, true);
+				rotationPeriod, 456, active);
 		return new TransportKeys(transportId, inPrev, inCurr, inNext, outCurr);
 	}
 

bramble-core/src/test/java/org/briarproject/bramble/plugin/PluginManagerImplTest.java

@@ -2,6 +2,7 @@ package org.briarproject.bramble.plugin;
 
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.plugin.ConnectionManager;
+import org.briarproject.bramble.api.plugin.ConnectionRegistry;
 import org.briarproject.bramble.api.plugin.PluginConfig;
 import org.briarproject.bramble.api.plugin.PluginException;
 import org.briarproject.bramble.api.plugin.TransportId;
@@ -13,16 +14,18 @@ import org.briarproject.bramble.api.plugin.simplex.SimplexPluginCallback;
 import org.briarproject.bramble.api.plugin.simplex.SimplexPluginFactory;
 import org.briarproject.bramble.api.properties.TransportPropertyManager;
 import org.briarproject.bramble.api.settings.SettingsManager;
-import org.briarproject.bramble.api.ui.UiCallback;
+import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.test.BrambleTestCase;
 import org.jmock.Expectations;
 import org.jmock.Mockery;
 import org.jmock.lib.concurrent.Synchroniser;
 import org.junit.Test;
 
+import java.security.SecureRandom;
 import java.util.Arrays;
 import java.util.concurrent.Executor;
 import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
 
 import static org.briarproject.bramble.test.TestUtils.getTransportId;
 
@@ -34,15 +37,20 @@ public class PluginManagerImplTest extends BrambleTestCase {
 			setThreadingPolicy(new Synchroniser());
 		}};
 		Executor ioExecutor = Executors.newSingleThreadExecutor();
+		ScheduledExecutorService scheduler =
+				context.mock(ScheduledExecutorService.class);
+		SecureRandom random = new SecureRandom();
+		Clock clock = context.mock(Clock.class);
 		EventBus eventBus = context.mock(EventBus.class);
 		PluginConfig pluginConfig = context.mock(PluginConfig.class);
 		ConnectionManager connectionManager =
 				context.mock(ConnectionManager.class);
+		ConnectionRegistry connectionRegistry =
+				context.mock(ConnectionRegistry.class);
 		SettingsManager settingsManager =
 				context.mock(SettingsManager.class);
 		TransportPropertyManager transportPropertyManager =
 				context.mock(TransportPropertyManager.class);
-		UiCallback uiCallback = context.mock(UiCallback.class);
 
 		// Two simplex plugin factories: both create plugins, one fails to start
 		SimplexPluginFactory simplexFactory =
@@ -71,6 +79,8 @@ public class PluginManagerImplTest extends BrambleTestCase {
 			will(returnValue(simplexFailId));
 			allowing(duplexPlugin).getId();
 			will(returnValue(duplexId));
+			allowing(pluginConfig).shouldPoll();
+			will(returnValue(false));
 			// start()
 			// First simplex plugin
 			oneOf(pluginConfig).getSimplexFactories();
@@ -112,9 +122,9 @@ public class PluginManagerImplTest extends BrambleTestCase {
 			oneOf(duplexPlugin).stop();
 		}});
 
-		PluginManagerImpl p = new PluginManagerImpl(ioExecutor, eventBus,
-				pluginConfig, connectionManager, settingsManager,
-				transportPropertyManager, uiCallback);
+		PluginManagerImpl p = new PluginManagerImpl(ioExecutor, scheduler,
+				eventBus, pluginConfig, connectionManager, connectionRegistry,
+				settingsManager, transportPropertyManager, random, clock);
 
 		// Two plugins should be started and stopped
 		p.startService();

bramble-core/src/test/java/org/briarproject/bramble/plugin/PollerTest.java

@@ -15,6 +15,8 @@ import org.briarproject.bramble.api.plugin.event.ConnectionOpenedEvent;
 import org.briarproject.bramble.api.plugin.event.TransportDisabledEvent;
 import org.briarproject.bramble.api.plugin.event.TransportEnabledEvent;
 import org.briarproject.bramble.api.plugin.simplex.SimplexPlugin;
+import org.briarproject.bramble.api.properties.TransportProperties;
+import org.briarproject.bramble.api.properties.TransportPropertyManager;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.test.BrambleMockTestCase;
 import org.briarproject.bramble.test.ImmediateExecutor;
@@ -24,13 +26,15 @@ import org.jmock.lib.legacy.ClassImposteriser;
 import org.junit.Test;
 
 import java.security.SecureRandom;
-import java.util.Arrays;
-import java.util.Collections;
 import java.util.List;
 import java.util.concurrent.Executor;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.ScheduledFuture;
 
+import static java.util.Arrays.asList;
+import static java.util.Collections.emptyList;
+import static java.util.Collections.singletonList;
+import static java.util.Collections.singletonMap;
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static org.briarproject.bramble.test.TestUtils.getTransportId;
 
@@ -44,6 +48,8 @@ public class PollerTest extends BrambleMockTestCase {
 			context.mock(ConnectionRegistry.class);
 	private final PluginManager pluginManager =
 			context.mock(PluginManager.class);
+	private final TransportPropertyManager transportPropertyManager =
+			context.mock(TransportPropertyManager.class);
 	private final Clock clock = context.mock(Clock.class);
 	private final ScheduledFuture future = context.mock(ScheduledFuture.class);
 	private final SecureRandom random;
@@ -51,6 +57,7 @@ public class PollerTest extends BrambleMockTestCase {
 	private final Executor ioExecutor = new ImmediateExecutor();
 	private final TransportId transportId = getTransportId();
 	private final ContactId contactId = new ContactId(234);
+	private final TransportProperties properties = new TransportProperties();
 	private final int pollingInterval = 60 * 1000;
 	private final long now = System.currentTimeMillis();
 
@@ -66,8 +73,8 @@ public class PollerTest extends BrambleMockTestCase {
 		SimplexPlugin simplexPlugin1 =
 				context.mock(SimplexPlugin.class, "simplexPlugin1");
 		TransportId simplexId1 = getTransportId();
-		List<SimplexPlugin> simplexPlugins = Arrays.asList(simplexPlugin,
-				simplexPlugin1);
+		List<SimplexPlugin> simplexPlugins =
+				asList(simplexPlugin, simplexPlugin1);
 		TransportConnectionWriter simplexWriter =
 				context.mock(TransportConnectionWriter.class);
 
@@ -76,8 +83,8 @@ public class PollerTest extends BrambleMockTestCase {
 		TransportId duplexId = getTransportId();
 		DuplexPlugin duplexPlugin1 =
 				context.mock(DuplexPlugin.class, "duplexPlugin1");
-		List<DuplexPlugin> duplexPlugins = Arrays.asList(duplexPlugin,
-				duplexPlugin1);
+		List<DuplexPlugin> duplexPlugins =
+				asList(duplexPlugin, duplexPlugin1);
 		DuplexTransportConnection duplexConnection =
 				context.mock(DuplexTransportConnection.class);
 
@@ -96,8 +103,12 @@ public class PollerTest extends BrambleMockTestCase {
 			will(returnValue(simplexId1));
 			oneOf(connectionRegistry).isConnected(contactId, simplexId1);
 			will(returnValue(false));
+			// Get the transport properties
+			oneOf(transportPropertyManager).getRemoteProperties(contactId,
+					simplexId1);
+			will(returnValue(properties));
 			// Connect to the contact
-			oneOf(simplexPlugin1).createWriter(contactId);
+			oneOf(simplexPlugin1).createWriter(properties);
 			will(returnValue(simplexWriter));
 			// Pass the connection to the connection manager
 			oneOf(connectionManager).manageOutgoingConnection(contactId,
@@ -105,7 +116,7 @@ public class PollerTest extends BrambleMockTestCase {
 			// Get the duplex plugins
 			oneOf(pluginManager).getDuplexPlugins();
 			will(returnValue(duplexPlugins));
-			// The first plugin supports polling
+			// The duplex plugin supports polling
 			oneOf(duplexPlugin).shouldPoll();
 			will(returnValue(true));
 			// Check whether the contact is already connected
@@ -113,8 +124,12 @@ public class PollerTest extends BrambleMockTestCase {
 			will(returnValue(duplexId));
 			oneOf(connectionRegistry).isConnected(contactId, duplexId);
 			will(returnValue(false));
+			// Get the transport properties
+			oneOf(transportPropertyManager).getRemoteProperties(contactId,
+					duplexId);
+			will(returnValue(properties));
 			// Connect to the contact
-			oneOf(duplexPlugin).createConnection(contactId);
+			oneOf(duplexPlugin).createConnection(properties);
 			will(returnValue(duplexConnection));
 			// Pass the connection to the connection manager
 			oneOf(connectionManager).manageOutgoingConnection(contactId,
@@ -125,7 +140,8 @@ public class PollerTest extends BrambleMockTestCase {
 		}});
 
 		Poller p = new Poller(ioExecutor, scheduler, connectionManager,
-				connectionRegistry, pluginManager, random, clock);
+				connectionRegistry, pluginManager, transportPropertyManager,
+				random, clock);
 
 		p.eventOccurred(new ContactStatusChangedEvent(contactId, true));
 	}
@@ -165,8 +181,12 @@ public class PollerTest extends BrambleMockTestCase {
 			// Check whether the contact is already connected
 			oneOf(connectionRegistry).isConnected(contactId, transportId);
 			will(returnValue(false));
+			// Get the transport properties
+			oneOf(transportPropertyManager).getRemoteProperties(contactId,
+					transportId);
+			will(returnValue(properties));
 			// Connect to the contact
-			oneOf(plugin).createConnection(contactId);
+			oneOf(plugin).createConnection(properties);
 			will(returnValue(duplexConnection));
 			// Pass the connection to the connection manager
 			oneOf(connectionManager).manageOutgoingConnection(contactId,
@@ -174,15 +194,15 @@ public class PollerTest extends BrambleMockTestCase {
 		}});
 
 		Poller p = new Poller(ioExecutor, scheduler, connectionManager,
-				connectionRegistry, pluginManager, random, clock);
+				connectionRegistry, pluginManager, transportPropertyManager,
+				random, clock);
 
 		p.eventOccurred(new ConnectionClosedEvent(contactId, transportId,
 				false));
 	}
 
-
 	@Test
-	public void testRescheduleOnConnectionOpened() throws Exception {
+	public void testRescheduleOnConnectionOpened() {
 		Plugin plugin = context.mock(Plugin.class);
 
 		context.checking(new Expectations() {{
@@ -205,14 +225,15 @@ public class PollerTest extends BrambleMockTestCase {
 		}});
 
 		Poller p = new Poller(ioExecutor, scheduler, connectionManager,
-				connectionRegistry, pluginManager, random, clock);
+				connectionRegistry, pluginManager, transportPropertyManager,
+				random, clock);
 
 		p.eventOccurred(new ConnectionOpenedEvent(contactId, transportId,
 				false));
 	}
 
 	@Test
-	public void testRescheduleDoesNotReplaceEarlierTask() throws Exception {
+	public void testRescheduleDoesNotReplaceEarlierTask() {
 		Plugin plugin = context.mock(Plugin.class);
 
 		context.checking(new Expectations() {{
@@ -248,7 +269,8 @@ public class PollerTest extends BrambleMockTestCase {
 		}});
 
 		Poller p = new Poller(ioExecutor, scheduler, connectionManager,
-				connectionRegistry, pluginManager, random, clock);
+				connectionRegistry, pluginManager, transportPropertyManager,
+				random, clock);
 
 		p.eventOccurred(new ConnectionOpenedEvent(contactId, transportId,
 				false));
@@ -257,7 +279,7 @@ public class PollerTest extends BrambleMockTestCase {
 	}
 
 	@Test
-	public void testRescheduleReplacesLaterTask() throws Exception {
+	public void testRescheduleReplacesLaterTask() {
 		Plugin plugin = context.mock(Plugin.class);
 
 		context.checking(new Expectations() {{
@@ -296,7 +318,8 @@ public class PollerTest extends BrambleMockTestCase {
 		}});
 
 		Poller p = new Poller(ioExecutor, scheduler, connectionManager,
-				connectionRegistry, pluginManager, random, clock);
+				connectionRegistry, pluginManager, transportPropertyManager,
+				random, clock);
 
 		p.eventOccurred(new ConnectionOpenedEvent(contactId, transportId,
 				false));
@@ -306,8 +329,7 @@ public class PollerTest extends BrambleMockTestCase {
 
 	@Test
 	public void testPollsOnTransportEnabled() throws Exception {
-		Plugin plugin = context.mock(Plugin.class);
-		List<ContactId> connected = Collections.singletonList(contactId);
+		DuplexPlugin plugin = context.mock(DuplexPlugin.class);
 
 		context.checking(new Expectations() {{
 			allowing(plugin).getId();
@@ -335,20 +357,69 @@ public class PollerTest extends BrambleMockTestCase {
 			oneOf(scheduler).schedule(with(any(Runnable.class)),
 					with((long) (pollingInterval * 0.5)), with(MILLISECONDS));
 			will(returnValue(future));
-			// Poll the plugin
+			// Get the transport properties and connected contacts
+			oneOf(transportPropertyManager).getRemoteProperties(transportId);
+			will(returnValue(singletonMap(contactId, properties)));
 			oneOf(connectionRegistry).getConnectedContacts(transportId);
-			will(returnValue(connected));
-			oneOf(plugin).poll(connected);
+			will(returnValue(emptyList()));
+			// Poll the plugin
+			oneOf(plugin).poll(singletonMap(contactId, properties));
 		}});
 
 		Poller p = new Poller(ioExecutor, scheduler, connectionManager,
-				connectionRegistry, pluginManager, random, clock);
+				connectionRegistry, pluginManager, transportPropertyManager,
+				random, clock);
 
 		p.eventOccurred(new TransportEnabledEvent(transportId));
 	}
 
 	@Test
-	public void testCancelsPollingOnTransportDisabled() throws Exception {
+	public void testDoesNotPollIfAllContactsAreConnected() throws Exception {
+		DuplexPlugin plugin = context.mock(DuplexPlugin.class);
+
+		context.checking(new Expectations() {{
+			allowing(plugin).getId();
+			will(returnValue(transportId));
+			// Get the plugin
+			oneOf(pluginManager).getPlugin(transportId);
+			will(returnValue(plugin));
+			// The plugin supports polling
+			oneOf(plugin).shouldPoll();
+			will(returnValue(true));
+			// Schedule a polling task immediately
+			oneOf(clock).currentTimeMillis();
+			will(returnValue(now));
+			oneOf(scheduler).schedule(with(any(Runnable.class)), with(0L),
+					with(MILLISECONDS));
+			will(returnValue(future));
+			will(new RunAction());
+			// Running the polling task schedules the next polling task
+			oneOf(plugin).getPollingInterval();
+			will(returnValue(pollingInterval));
+			oneOf(random).nextDouble();
+			will(returnValue(0.5));
+			oneOf(clock).currentTimeMillis();
+			will(returnValue(now));
+			oneOf(scheduler).schedule(with(any(Runnable.class)),
+					with((long) (pollingInterval * 0.5)), with(MILLISECONDS));
+			will(returnValue(future));
+			// Get the transport properties and connected contacts
+			oneOf(transportPropertyManager).getRemoteProperties(transportId);
+			will(returnValue(singletonMap(contactId, properties)));
+			oneOf(connectionRegistry).getConnectedContacts(transportId);
+			will(returnValue(singletonList(contactId)));
+			// All contacts are connected, so don't poll the plugin
+		}});
+
+		Poller p = new Poller(ioExecutor, scheduler, connectionManager,
+				connectionRegistry, pluginManager, transportPropertyManager,
+				random, clock);
+
+		p.eventOccurred(new TransportEnabledEvent(transportId));
+	}
+
+	@Test
+	public void testCancelsPollingOnTransportDisabled() {
 		Plugin plugin = context.mock(Plugin.class);
 
 		context.checking(new Expectations() {{
@@ -371,7 +442,8 @@ public class PollerTest extends BrambleMockTestCase {
 		}});
 
 		Poller p = new Poller(ioExecutor, scheduler, connectionManager,
-				connectionRegistry, pluginManager, random, clock);
+				connectionRegistry, pluginManager, transportPropertyManager,
+				random, clock);
 
 		p.eventOccurred(new TransportEnabledEvent(transportId));
 		p.eventOccurred(new TransportDisabledEvent(transportId));

bramble-core/src/test/java/org/briarproject/bramble/plugin/tcp/LanTcpPluginTest.java

@@ -23,8 +23,6 @@ import java.net.ServerSocket;
 import java.net.Socket;
 import java.util.Collections;
 import java.util.Comparator;
-import java.util.Hashtable;
-import java.util.Map;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.Executor;
 import java.util.concurrent.Executors;
@@ -40,7 +38,6 @@ import static org.junit.Assert.assertTrue;
 
 public class LanTcpPluginTest extends BrambleTestCase {
 
-	private final ContactId contactId = new ContactId(234);
 	private final Backoff backoff = new TestBackoff();
 
 	@Test
@@ -160,12 +157,10 @@ public class LanTcpPluginTest extends BrambleTestCase {
 				error.set(true);
 			}
 		}).start();
-		// Tell the plugin about the port
+		// Connect to the port
 		TransportProperties p = new TransportProperties();
 		p.put("ipPorts", addrString + ":" + port);
-		callback.remote.put(contactId, p);
-		// Connect to the port
-		DuplexTransportConnection d = plugin.createConnection(contactId);
+		DuplexTransportConnection d = plugin.createConnection(p);
 		assertNotNull(d);
 		// Check that the connection was accepted
 		assertTrue(latch.await(5, SECONDS));
@@ -281,7 +276,7 @@ public class LanTcpPluginTest extends BrambleTestCase {
 	}
 
 	@Test
-	public void testComparatorPrefersNonZeroPorts() throws Exception {
+	public void testComparatorPrefersNonZeroPorts() {
 		Comparator<InetSocketAddress> comparator = new LanAddressComparator();
 		InetSocketAddress nonZero = new InetSocketAddress("1.2.3.4", 1234);
 		InetSocketAddress zero = new InetSocketAddress("1.2.3.4", 0);
@@ -294,7 +289,7 @@ public class LanTcpPluginTest extends BrambleTestCase {
 	}
 
 	@Test
-	public void testComparatorPrefersLongerPrefixes() throws Exception {
+	public void testComparatorPrefersLongerPrefixes() {
 		Comparator<InetSocketAddress> comparator = new LanAddressComparator();
 		InetSocketAddress prefix192 = new InetSocketAddress("192.168.0.1", 0);
 		InetSocketAddress prefix172 = new InetSocketAddress("172.16.0.1", 0);
@@ -314,7 +309,7 @@ public class LanTcpPluginTest extends BrambleTestCase {
 	}
 
 	@Test
-	public void testComparatorPrefersSiteLocalToLinkLocal() throws Exception {
+	public void testComparatorPrefersSiteLocalToLinkLocal() {
 		Comparator<InetSocketAddress> comparator = new LanAddressComparator();
 		InetSocketAddress prefix192 = new InetSocketAddress("192.168.0.1", 0);
 		InetSocketAddress prefix172 = new InetSocketAddress("172.16.0.1", 0);
@@ -345,8 +340,6 @@ public class LanTcpPluginTest extends BrambleTestCase {
 	@NotNullByDefault
 	private static class Callback implements DuplexPluginCallback {
 
-		private final Map<ContactId, TransportProperties> remote =
-				new Hashtable<>();
 		private final CountDownLatch propertiesLatch = new CountDownLatch(1);
 		private final CountDownLatch connectionsLatch = new CountDownLatch(1);
 		private final TransportProperties local = new TransportProperties();
@@ -361,16 +354,6 @@ public class LanTcpPluginTest extends BrambleTestCase {
 			return local;
 		}
 
-		@Override
-		public Map<ContactId, TransportProperties> getRemoteProperties() {
-			return remote;
-		}
-
-		@Override
-		public TransportProperties getRemoteProperties(ContactId c) {
-			return remote.get(c);
-		}
-
 		@Override
 		public void mergeSettings(Settings s) {
 		}
@@ -381,20 +364,6 @@ public class LanTcpPluginTest extends BrambleTestCase {
 			propertiesLatch.countDown();
 		}
 
-		@Override
-		public int showChoice(String[] options, String... message) {
-			return -1;
-		}
-
-		@Override
-		public boolean showConfirmationMessage(String... message) {
-			return false;
-		}
-
-		@Override
-		public void showMessage(String... message) {
-		}
-
 		@Override
 		public void incomingConnectionCreated(DuplexTransportConnection d) {
 			connectionsLatch.countDown();

bramble-core/src/test/java/org/briarproject/bramble/sync/SimplexOutgoingSessionTest.java

@@ -7,11 +7,10 @@ import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.sync.Ack;
 import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.bramble.api.sync.SyncRecordWriter;
-import org.briarproject.bramble.test.BrambleTestCase;
+import org.briarproject.bramble.api.transport.StreamWriter;
+import org.briarproject.bramble.test.BrambleMockTestCase;
 import org.briarproject.bramble.test.ImmediateExecutor;
-import org.briarproject.bramble.test.TestUtils;
 import org.jmock.Expectations;
-import org.jmock.Mockery;
 import org.junit.Test;
 
 import java.util.Arrays;
@@ -19,33 +18,27 @@ import java.util.Collections;
 import java.util.concurrent.Executor;
 
 import static org.briarproject.bramble.api.sync.SyncConstants.MAX_MESSAGE_IDS;
+import static org.briarproject.bramble.test.TestUtils.getRandomId;
 
-public class SimplexOutgoingSessionTest extends BrambleTestCase {
+public class SimplexOutgoingSessionTest extends BrambleMockTestCase {
 
-	private final Mockery context;
-	private final DatabaseComponent db;
-	private final Executor dbExecutor;
-	private final EventBus eventBus;
-	private final ContactId contactId;
-	private final MessageId messageId;
-	private final int maxLatency;
-	private final SyncRecordWriter recordWriter;
+	private static final int MAX_LATENCY = Integer.MAX_VALUE;
 
-	public SimplexOutgoingSessionTest() {
-		context = new Mockery();
-		db = context.mock(DatabaseComponent.class);
-		dbExecutor = new ImmediateExecutor();
-		eventBus = context.mock(EventBus.class);
-		recordWriter = context.mock(SyncRecordWriter.class);
-		contactId = new ContactId(234);
-		messageId = new MessageId(TestUtils.getRandomId());
-		maxLatency = Integer.MAX_VALUE;
-	}
+	private final DatabaseComponent db = context.mock(DatabaseComponent.class);
+	private final EventBus eventBus = context.mock(EventBus.class);
+	private final StreamWriter streamWriter = context.mock(StreamWriter.class);
+	private final SyncRecordWriter recordWriter =
+			context.mock(SyncRecordWriter.class);
+
+	private final Executor dbExecutor = new ImmediateExecutor();
+	private final ContactId contactId = new ContactId(234);
+	private final MessageId messageId = new MessageId(getRandomId());
 
 	@Test
 	public void testNothingToSend() throws Exception {
 		SimplexOutgoingSession session = new SimplexOutgoingSession(db,
-				dbExecutor, eventBus, contactId, maxLatency, recordWriter);
+				dbExecutor, eventBus, contactId, MAX_LATENCY, streamWriter,
+				recordWriter);
 		Transaction noAckTxn = new Transaction(null, false);
 		Transaction noMsgTxn = new Transaction(null, false);
 
@@ -63,19 +56,17 @@ public class SimplexOutgoingSessionTest extends BrambleTestCase {
 			oneOf(db).startTransaction(false);
 			will(returnValue(noMsgTxn));
 			oneOf(db).generateBatch(with(noMsgTxn), with(contactId),
-					with(any(int.class)), with(maxLatency));
+					with(any(int.class)), with(MAX_LATENCY));
 			will(returnValue(null));
 			oneOf(db).commitTransaction(noMsgTxn);
 			oneOf(db).endTransaction(noMsgTxn);
-			// Flush the output stream
-			oneOf(recordWriter).flush();
+			// Send the end of stream marker
+			oneOf(streamWriter).sendEndOfStream();
 			// Remove listener
 			oneOf(eventBus).removeListener(session);
 		}});
 
 		session.run();
-
-		context.assertIsSatisfied();
 	}
 
 	@Test
@@ -83,7 +74,8 @@ public class SimplexOutgoingSessionTest extends BrambleTestCase {
 		Ack ack = new Ack(Collections.singletonList(messageId));
 		byte[] raw = new byte[1234];
 		SimplexOutgoingSession session = new SimplexOutgoingSession(db,
-				dbExecutor, eventBus, contactId, maxLatency, recordWriter);
+				dbExecutor, eventBus, contactId, MAX_LATENCY, streamWriter,
+				recordWriter);
 		Transaction ackTxn = new Transaction(null, false);
 		Transaction noAckTxn = new Transaction(null, false);
 		Transaction msgTxn = new Transaction(null, false);
@@ -104,7 +96,7 @@ public class SimplexOutgoingSessionTest extends BrambleTestCase {
 			oneOf(db).startTransaction(false);
 			will(returnValue(msgTxn));
 			oneOf(db).generateBatch(with(msgTxn), with(contactId),
-					with(any(int.class)), with(maxLatency));
+					with(any(int.class)), with(MAX_LATENCY));
 			will(returnValue(Arrays.asList(raw)));
 			oneOf(db).commitTransaction(msgTxn);
 			oneOf(db).endTransaction(msgTxn);
@@ -120,18 +112,16 @@ public class SimplexOutgoingSessionTest extends BrambleTestCase {
 			oneOf(db).startTransaction(false);
 			will(returnValue(noMsgTxn));
 			oneOf(db).generateBatch(with(noMsgTxn), with(contactId),
-					with(any(int.class)), with(maxLatency));
+					with(any(int.class)), with(MAX_LATENCY));
 			will(returnValue(null));
 			oneOf(db).commitTransaction(noMsgTxn);
 			oneOf(db).endTransaction(noMsgTxn);
-			// Flush the output stream
-			oneOf(recordWriter).flush();
+			// Send the end of stream marker
+			oneOf(streamWriter).sendEndOfStream();
 			// Remove listener
 			oneOf(eventBus).removeListener(session);
 		}});
 
 		session.run();
-
-		context.assertIsSatisfied();
 	}
 }