private TrackerInfo doRequest(
String announce,
String infoHash,
String peerID,
long uploaded,
long downloaded,
long left,
String event)
throws IOException {
String s =
announce
+ "?info_hash="
+ infoHash
+ "&peer_id="
+ peerID
+ "&port="
+ port
+ "&uploaded="
+ uploaded
+ "&downloaded="
+ downloaded
+ "&left="
+ left
+ ((event != NO_EVENT) ? ("&event=" + event) : "");
URL u = new URL(s);
if (Snark.debug >= Snark.INFO) Snark.debug("Sending TrackerClient request: " + u, Snark.INFO);
URLConnection c = u.openConnection();
c.connect();
InputStream in = c.getInputStream();
if (c instanceof HttpURLConnection) {
// Check whether the page exists
int code = ((HttpURLConnection) c).getResponseCode();
if (code / 100 != 2) // We can only handle 200 OK responses
throw new IOException(
"Loading '" + s + "' gave error code " + code + ", it probably doesn't exists");
}
TrackerInfo info = new TrackerInfo(in, coordinator.getID(), coordinator.getMetaInfo());
if (Snark.debug >= Snark.INFO) Snark.debug("TrackerClient response: " + info, Snark.INFO);
lastRequestTime = System.currentTimeMillis();
String failure = info.getFailureReason();
if (failure != null) throw new IOException(failure);
interval = info.getInterval() * 1000;
return info;
}
public TrackerClient(MetaInfo meta, PeerCoordinator coordinator, int port) {
// Set unique name.
super("TrackerClient-" + urlencode(coordinator.getID()));
this.meta = meta;
this.coordinator = coordinator;
// XXX - No way to actaully give the tracker feedback that we
// don't run a peer acceptor on any port so use discard 9/tcp sink null
this.port = (port == -1) ? 9 : port;
stop = false;
}
public void run() {
// XXX - Support other IPs
String announce = meta.getAnnounce();
String infoHash = urlencode(meta.getInfoHash());
String peerID = urlencode(coordinator.getID());
long uploaded = coordinator.getUploaded();
long downloaded = coordinator.getDownloaded();
long left = coordinator.getLeft();
boolean completed = (left == 0);
try {
boolean started = false;
while (!started) {
try {
// Send start.
TrackerInfo info =
doRequest(announce, infoHash, peerID, uploaded, downloaded, left, STARTED_EVENT);
Iterator it = info.getPeers().iterator();
while (it.hasNext()) coordinator.addPeer((Peer) it.next());
started = true;
} catch (IOException ioe) {
// Probably not fatal (if it doesn't last to long...)
Snark.debug(
"WARNING: Could not contact tracker at '" + announce + "': " + ioe, Snark.WARNING);
}
if (!started && !stop) {
Snark.debug(" Retrying in one minute...", Snark.DEBUG);
try {
// Sleep one minutes...
Thread.sleep(60 * 1000);
} catch (InterruptedException interrupt) {
// ignore
}
}
}
while (!stop) {
try {
// Sleep some minutes...
Thread.sleep(SLEEP * 60 * 1000);
} catch (InterruptedException interrupt) {
// ignore
}
if (stop) break;
uploaded = coordinator.getUploaded();
downloaded = coordinator.getDownloaded();
left = coordinator.getLeft();
// First time we got a complete download?
String event;
if (!completed && left == 0) {
completed = true;
event = COMPLETED_EVENT;
} else event = NO_EVENT;
// Only do a request when necessary.
if (event == COMPLETED_EVENT
|| coordinator.needPeers()
|| System.currentTimeMillis() > lastRequestTime + interval) {
try {
TrackerInfo info =
doRequest(announce, infoHash, peerID, uploaded, downloaded, left, event);
Iterator it = info.getPeers().iterator();
while (it.hasNext()) coordinator.addPeer((Peer) it.next());
} catch (IOException ioe) {
// Probably not fatal (if it doesn't last to long...)
Snark.debug(
"WARNING: Could not contact tracker at '" + announce + "': " + ioe, Snark.WARNING);
}
}
}
} catch (Throwable t) {
Snark.debug("TrackerClient: " + t, Snark.ERROR);
t.printStackTrace();
} finally {
try {
TrackerInfo info =
doRequest(announce, infoHash, peerID, uploaded, downloaded, left, STOPPED_EVENT);
} catch (IOException ioe) {
/* ignored */
}
}
}