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Implement background task for fetching RSS feeds

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* Implemented in briar-core as a `ScheduledExecutorService`
  that gets started when the app starts
* The briar-api has a `FeedManager` interface
  that the UI can use to register and unregister feeds
* In this first iteration, feeds are fetched via HTTP(S), not Tor

Closes #484
This commit is contained in:
Torsten Grote
2016-07-22 18:16:05 -03:00
parent 4af5dbb45b
commit e527e30712
11 changed files with 500 additions and 2 deletions
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89
briar-api/src/org/briarproject/api/feed/Feed.java Normal file
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package org.briarproject.api.feed;
import org.briarproject.api.FormatException;
import org.briarproject.api.data.BdfDictionary;
import org.briarproject.api.data.BdfEntry;
import org.briarproject.api.sync.GroupId;
import org.jetbrains.annotations.Nullable;
import static org.briarproject.api.feed.FeedConstants.KEY_BLOG_GROUP_ID;
import static org.briarproject.api.feed.FeedConstants.KEY_FEED_ADDED;
import static org.briarproject.api.feed.FeedConstants.KEY_FEED_AUTHOR;
import static org.briarproject.api.feed.FeedConstants.KEY_FEED_DESC;
import static org.briarproject.api.feed.FeedConstants.KEY_FEED_TITLE;
import static org.briarproject.api.feed.FeedConstants.KEY_FEED_UPDATED;
import static org.briarproject.api.feed.FeedConstants.KEY_FEED_URL;
public class Feed {
final private String url;
final private GroupId blogId;
final private String title, description, author;
final private long added, updated;
public Feed(String url, GroupId blogId, @Nullable String title,
@Nullable String description, @Nullable String author,
long added, long updated) {
this.url = url;
this.blogId = blogId;
this.title = title;
this.description = description;
this.author = author;
this.added = added;
this.updated = updated;
}
public String getUrl() {
return url;
}
public GroupId getBlogId() {
return blogId;
}
public BdfDictionary toBdfDictionary() {
BdfDictionary d = BdfDictionary.of(
new BdfEntry(KEY_FEED_URL, url),
new BdfEntry(KEY_BLOG_GROUP_ID, blogId.getBytes()),
new BdfEntry(KEY_FEED_ADDED, added),
new BdfEntry(KEY_FEED_UPDATED, updated)
);
if (title != null) d.put(KEY_FEED_TITLE, title);
if (description != null) d.put(KEY_FEED_DESC, description);
if (author != null) d.put(KEY_FEED_AUTHOR, author);
return d;
}
public static Feed from(BdfDictionary d) throws FormatException {
String url = d.getString(KEY_FEED_URL);
GroupId blogId = new GroupId(d.getRaw(KEY_BLOG_GROUP_ID));
String title = d.getOptionalString(KEY_FEED_TITLE);
String desc = d.getOptionalString(KEY_FEED_DESC);
String author = d.getOptionalString(KEY_FEED_AUTHOR);
long added = d.getLong(KEY_FEED_ADDED, 0L);
long updated = d.getLong(KEY_FEED_UPDATED, 0L);
return new Feed(url, blogId, title, desc, author, added, updated);
}
public String getTitle() {
return title;
}
public String getDescription() {
return description;
}
public String getAuthor() {
return author;
}
public long getAdded() {
return added;
}
public long getUpdated() {
return updated;
}
}

21
briar-api/src/org/briarproject/api/feed/FeedConstants.java Normal file
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package org.briarproject.api.feed;
public interface FeedConstants {
/* delay after start before fetching feed, in minutes */
int FETCH_DELAY_INITIAL = 1;
/* the interval the feed should be fetched, in minutes */
int FETCH_INTERVAL = 30;
// group metadata keys
String KEY_FEEDS = "feeds";
String KEY_FEED_URL = "feedURL";
String KEY_BLOG_GROUP_ID = "blogGroupId";
String KEY_FEED_TITLE = "feedTitle";
String KEY_FEED_DESC = "feedDesc";
String KEY_FEED_AUTHOR = "feedAuthor";
String KEY_FEED_ADDED = "feedAdded";
String KEY_FEED_UPDATED = "feedUpdated";
}

24
briar-api/src/org/briarproject/api/feed/FeedManager.java Normal file
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package org.briarproject.api.feed;
import org.briarproject.api.db.DbException;
import org.briarproject.api.sync.ClientId;
import org.briarproject.api.sync.GroupId;
import java.io.IOException;
import java.util.List;
public interface FeedManager {
/** Returns the unique ID of the client. */
ClientId getClientId();
/** Adds a RSS feed. */
void addFeed(String url, GroupId g) throws DbException, IOException;
/** Removes a RSS feed. */
void removeFeed(String url) throws DbException;
/** Gets a list of all added RSS feeds */
List<Feed> getFeeds() throws DbException;
}