/* TrackerClient - Class that informs a tracker and gets new peers.
Copyright (C) 2003 Mark J. Wielaard
This file is part of Snark.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
package org.klomp.snark;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.Random;
import java.util.Set;
import net.i2p.I2PAppContext;
import net.i2p.data.DataHelper;
import net.i2p.data.Hash;
import net.i2p.util.ConvertToHash;
import net.i2p.util.I2PAppThread;
import net.i2p.util.Log;
import net.i2p.util.SimpleTimer2;
import org.klomp.snark.bencode.InvalidBEncodingException;
import org.klomp.snark.dht.DHT;
/**
* Informs metainfo tracker of events and gets new peers for peer
* coordinator.
*
* start() creates a thread and starts it.
* At the end of each run, a TimedEvent is queued on the SimpleTimer2 queue.
* The TimedEvent creates a new thread and starts it, so it does not
* clog SimpleTimer2.
*
* The thread runs one pass through the trackers, the PEX, and the DHT,
* then queues a new TimedEvent and exits.
*
* Thus there are only threads that are actively announcing, not one thread per torrent forever.
*
* start() may be called again after halt().
*
* @author Mark Wielaard (mark@klomp.org)
*/
public class TrackerClient implements Runnable {
private final Log _log;
private static final String NO_EVENT = "";
private static final String STARTED_EVENT = "started";
private static final String COMPLETED_EVENT = "completed";
private static final String STOPPED_EVENT = "stopped";
private static final String NOT_REGISTERED = "torrent not registered"; //bytemonsoon
/** this is our equivalent to router.utorrent.com for bootstrap */
private static final String DEFAULT_BACKUP_TRACKER = "http://tracker.welterde.i2p/a";
private final static int SLEEP = 5; // 5 minutes.
private final static int DELAY_MIN = 2000; // 2 secs.
private final static int DELAY_RAND = 6*1000;
private final static int MAX_REGISTER_FAILS = 10; // * INITIAL_SLEEP = 15m to register
private final static int INITIAL_SLEEP = 90*1000;
private final static int MAX_CONSEC_FAILS = 5; // slow down after this
private final static int LONG_SLEEP = 30*60*1000; // sleep a while after lots of fails
private final static long MIN_TRACKER_ANNOUNCE_INTERVAL = 15*60*1000;
private final static long MIN_DHT_ANNOUNCE_INTERVAL = 10*60*1000;
private final I2PSnarkUtil _util;
private final MetaInfo meta;
private final String infoHash;
private final String peerID;
private final String additionalTrackerURL;
private final PeerCoordinator coordinator;
private final Snark snark;
private final int port;
private final String _threadName;
private volatile boolean stop = true;
private volatile boolean started;
private volatile boolean _initialized;
private volatile int _runCount;
// running thread so it can be interrupted
private volatile Thread _thread;
// queued event so it can be cancelled
private volatile SimpleTimer2.TimedEvent _event;
// these 2 used in loop()
private volatile boolean runStarted;
private volatile int consecutiveFails;
private boolean completed;
private volatile boolean _fastUnannounce;
private long lastDHTAnnounce;
private final List<TCTracker> trackers;
private final List<TCTracker> backupTrackers;
/**
* Call start() to start it.
*
* @param meta null if in magnet mode
* @param additionalTrackerURL may be null, from the ?tr= param in magnet mode, otherwise ignored
*/
public TrackerClient(I2PSnarkUtil util, MetaInfo meta, String additionalTrackerURL,
PeerCoordinator coordinator, Snark snark)
{
super();
// Set unique name.
String id = urlencode(snark.getID());
_threadName = "TrackerClient " + id.substring(id.length() - 12);
_util = util;
_log = util.getContext().logManager().getLog(TrackerClient.class);
this.meta = meta;
this.additionalTrackerURL = additionalTrackerURL;
this.coordinator = coordinator;
this.snark = snark;
this.port = 6881; //(port == -1) ? 9 : port;
this.infoHash = urlencode(snark.getInfoHash());
this.peerID = urlencode(snark.getID());
this.trackers = new ArrayList(2);
this.backupTrackers = new ArrayList(2);
}
public synchronized void start() {
if (!stop) {
if (_log.shouldLog(Log.WARN))
_log.warn("Already started: " + _threadName);
return;
}
stop = false;
consecutiveFails = 0;
runStarted = false;
_fastUnannounce = false;
_thread = new I2PAppThread(this, _threadName + " #" + (++_runCount), true);
_thread.start();
started = true;
}
public boolean halted() { return stop; }
public boolean started() { return started; }
/**
* Interrupts this Thread to stop it.
* @param fast if true, limit the life of the unannounce threads
*/
public synchronized void halt(boolean fast) {
boolean wasStopped = stop;
if (wasStopped) {
if (_log.shouldLog(Log.WARN))
_log.warn("Already stopped: " + _threadName);
} else {
if (_log.shouldLog(Log.WARN))
_log.warn("Stopping: " + _threadName);
stop = true;
}
SimpleTimer2.TimedEvent e = _event;
if (e != null) {
if (_log.shouldLog(Log.DEBUG))
_log.debug("Cancelling next announce " + _threadName);
e.cancel();
_event = null;
}
Thread t = _thread;
if (t != null) {
if (_log.shouldLog(Log.DEBUG))
_log.debug("Interrupting " + t.getName());
t.interrupt();
}
_fastUnannounce = true;
if (!wasStopped)
unannounce();
}
private void queueLoop(long delay) {
_event = new Runner(delay);
}
private class Runner extends SimpleTimer2.TimedEvent {
public Runner(long delay) {
super(_util.getContext().simpleTimer2(), delay);
}
public void timeReached() {
_event = null;
_thread = new I2PAppThread(TrackerClient.this, _threadName + " #" + (++_runCount), true);
_thread.start();
}
}
private boolean verifyConnected() {
while (!stop && !_util.connected()) {
boolean ok = _util.connect();
if (!ok) {
try { Thread.sleep(30*1000); } catch (InterruptedException ie) {}
}
}
return !stop && _util.connected();
}
/**
* Setup the first time only,
* then one pass (usually) through the trackers, PEX, and DHT.
* This will take several seconds to several minutes.
*/
public void run() {
long begin = _util.getContext().clock().now();
if (_log.shouldLog(Log.DEBUG))
_log.debug("Start " + Thread.currentThread().getName());
try {
if (!_initialized) {
setup();
}
if (trackers.isEmpty() && _util.getDHT() == null) {
stop = true;
this.snark.addMessage(_util.getString("No valid trackers for {0} - enable opentrackers or DHT?",
this.snark.getBaseName()));
_log.error("No valid trackers for " + this.snark.getBaseName());
this.snark.stopTorrent();
return;
}
if (!_initialized) {
_initialized = true;
// FIXME only when starting everybody at once, not for a single torrent
long delay = _util.getContext().random().nextInt(30*1000);
try {
Thread.sleep(delay);
} catch (InterruptedException ie) {}
}
loop();
} finally {
// don't hold ref
_thread = null;
if (_log.shouldLog(Log.DEBUG))
_log.debug("Finish " + Thread.currentThread().getName() +
" after " + DataHelper.formatDuration(_util.getContext().clock().now() - begin));
}
}
/**
* Do this one time only (not every time it is started).
* @since 0.9.1
*/
private void setup() {
// Construct the list of trackers for this torrent,
// starting with the primary one listed in the metainfo,
// followed by the secondary open trackers
// It's painful, but try to make sure if an open tracker is also
// the primary tracker, that we don't add it twice.
// todo: check for b32 matches as well
String primary = null;
if (meta != null)
primary = meta.getAnnounce();
else if (additionalTrackerURL != null)
primary = additionalTrackerURL;
Set<Hash> trackerHashes = new HashSet(8);
// primary tracker
if (primary != null) {
if (isNewValidTracker(trackerHashes, primary)) {
trackers.add(new TCTracker(primary, true));
if (_log.shouldLog(Log.DEBUG))
_log.debug("Announce: [" + primary + "] infoHash: " + infoHash);
} else {
if (_log.shouldLog(Log.WARN))
_log.warn("Skipping invalid or non-i2p announce: " + primary);
}
} else {
_log.warn("No primary announce");
}
// announce list
if (meta != null && !meta.isPrivate()) {
List<List<String>> list = meta.getAnnounceList();
if (list != null) {
for (List<String> llist : list) {
for (String url : llist) {
if (!isNewValidTracker(trackerHashes, url))
continue;
trackers.add(new TCTracker(url, trackers.isEmpty()));
if (_log.shouldLog(Log.DEBUG))
_log.debug("Additional announce (list): [" + url + "] for infoHash: " + infoHash);
}
}
}
}
// configured open trackers
if (meta == null || !meta.isPrivate()) {
List<String> tlist = _util.getOpenTrackers();
for (int i = 0; i < tlist.size(); i++) {
String url = tlist.get(i);
if (!isNewValidTracker(trackerHashes, url))
continue;
// opentrackers are primary if we don't have primary
trackers.add(new TCTracker(url, trackers.isEmpty()));
if (_log.shouldLog(Log.DEBUG))
_log.debug("Additional announce: [" + url + "] for infoHash: " + infoHash);
}
}
// backup trackers if DHT needs bootstrapping
if (trackers.isEmpty() && (meta == null || !meta.isPrivate())) {
List<String> tlist = _util.getBackupTrackers();
for (int i = 0; i < tlist.size(); i++) {
String url = tlist.get(i);
if (!isNewValidTracker(trackerHashes, url))
continue;
backupTrackers.add(new TCTracker(url, false));
if (_log.shouldLog(Log.DEBUG))
_log.debug("Backup announce: [" + url + "] for infoHash: " + infoHash);
}
if (backupTrackers.isEmpty()) {
backupTrackers.add(new TCTracker(DEFAULT_BACKUP_TRACKER, false));
}
}
this.completed = coordinator.getLeft() == 0;
}
/**
* @param existing the ones we already know about
* @param ann an announce URL non-null
* @return true if ann is valid and new; adds to existing if returns true
* @since 0.9.5
*/
private boolean isNewValidTracker(Set<Hash> existing, String ann) {
Hash h = getHostHash(ann);
if (h == null) {
_log.error("Bad announce URL: [" + ann + ']');
return false;
}
boolean rv = existing.add(h);
if (!rv) {
if (_log.shouldLog(Log.INFO))
_log.info("Dup announce URL: [" + ann + ']');
}
return rv;
}
/**
* Announce to all the trackers, get peers from PEX and DHT, then queue up a SimpleTimer2 event.
* This will take several seconds to several minutes.
* @since 0.9.1
*/
private void loop() {
try
{
// normally this will only go once, then call queueLoop() and return
while(!stop)
{
if (!verifyConnected()) {
stop = true;
return;
}
// Local DHT tracker announce
DHT dht = _util.getDHT();
if (dht != null && (meta == null || !meta.isPrivate()))
dht.announce(snark.getInfoHash());
int maxSeenPeers = 0;
if (!trackers.isEmpty())
maxSeenPeers = getPeersFromTrackers(trackers);
int p = getPeersFromPEX();
if (p > maxSeenPeers)
maxSeenPeers = p;
p = getPeersFromDHT();
if (p > maxSeenPeers)
maxSeenPeers = p;
// backup if DHT needs bootstrapping
if (trackers.isEmpty() && !backupTrackers.isEmpty() && dht != null && dht.size() < 16) {
p = getPeersFromTrackers(backupTrackers);
if (p > maxSeenPeers)
maxSeenPeers = p;
}
// we could try and total the unique peers but that's too hard for now
snark.setTrackerSeenPeers(maxSeenPeers);
if (stop)
return;
try {
// Sleep some minutes...
// Sleep the minimum interval for all the trackers, but 60s minimum
int delay;
Random r = _util.getContext().random();
int random = r.nextInt(120*1000);
if (completed && runStarted)
delay = 3*SLEEP*60*1000 + random;
else if (snark.getTrackerProblems() != null && ++consecutiveFails < MAX_CONSEC_FAILS)
delay = INITIAL_SLEEP;
else if ((!runStarted) && _runCount < MAX_CONSEC_FAILS)
delay = INITIAL_SLEEP;
else
// sleep a while, when we wake up we will contact only the trackers whose intervals have passed
delay = SLEEP*60*1000 + random;
if (delay > 20*1000) {
// put ourselves on SimpleTimer2
if (_log.shouldLog(Log.DEBUG))
_log.debug("Requeueing in " + DataHelper.formatDuration(delay) + ": " + Thread.currentThread().getName());
queueLoop(delay);
return;
} else if (delay > 0) {
Thread.sleep(delay);
}
} catch(InterruptedException interrupt) {}
} // *** end of while loop
} // try
catch (Throwable t)
{
_log.error("TrackerClient: " + t, t);
if (t instanceof OutOfMemoryError)
throw (OutOfMemoryError)t;
}
}
/**
* @return max peers seen
*/
private int getPeersFromTrackers(List<TCTracker> trckrs) {
long uploaded = coordinator.getUploaded();
long downloaded = coordinator.getDownloaded();
long left = coordinator.getLeft(); // -1 in magnet mode
// First time we got a complete download?
String event;
if (!completed && left == 0)
{
completed = true;
event = COMPLETED_EVENT;
}
else
event = NO_EVENT;
// *** loop once for each tracker
int maxSeenPeers = 0;
for (TCTracker tr : trckrs) {
if ((!stop) && (!tr.stop) &&
(completed || coordinator.needOutboundPeers() || !tr.started) &&
(event.equals(COMPLETED_EVENT) || System.currentTimeMillis() > tr.lastRequestTime + tr.interval))
{
try
{
if (!tr.started)
event = STARTED_EVENT;
TrackerInfo info = doRequest(tr, infoHash, peerID,
uploaded, downloaded, left,
event);
snark.setTrackerProblems(null);
tr.trackerProblems = null;
tr.registerFails = 0;
tr.consecutiveFails = 0;
if (tr.isPrimary)
consecutiveFails = 0;
runStarted = true;
tr.started = true;
Set<Peer> peers = info.getPeers();
tr.seenPeers = info.getPeerCount();
if (snark.getTrackerSeenPeers() < tr.seenPeers) // update rising number quickly
snark.setTrackerSeenPeers(tr.seenPeers);
// pass everybody over to our tracker
DHT dht = _util.getDHT();
if (dht != null) {
for (Peer peer : peers) {
dht.announce(snark.getInfoHash(), peer.getPeerID().getDestHash());
}
}
if (coordinator.needOutboundPeers()) {
// we only want to talk to new people if we need things
// from them (duh)
List<Peer> ordered = new ArrayList(peers);
Random r = _util.getContext().random();
Collections.shuffle(ordered, r);
Iterator<Peer> it = ordered.iterator();
while ((!stop) && it.hasNext() && coordinator.needOutboundPeers()) {
Peer cur = it.next();
// FIXME if id == us || dest == us continue;
// only delay if we actually make an attempt to add peer
if(coordinator.addPeer(cur) && it.hasNext()) {
int delay = r.nextInt(DELAY_RAND) + DELAY_MIN;
try { Thread.sleep(delay); } catch (InterruptedException ie) {}
}
}
}
}
catch (IOException ioe)
{
// Probably not fatal (if it doesn't last to long...)
if (_log.shouldLog(Log.WARN))
_log.warn
("WARNING: Could not contact tracker at '"
+ tr.announce + "': " + ioe);
tr.trackerProblems = ioe.getMessage();
// don't show secondary tracker problems to the user
if (tr.isPrimary)
snark.setTrackerProblems(tr.trackerProblems);
if (tr.trackerProblems.toLowerCase(Locale.US).startsWith(NOT_REGISTERED)) {
// Give a guy some time to register it if using opentrackers too
//if (trckrs.size() == 1) {
// stop = true;
// snark.stopTorrent();
//} else { // hopefully each on the opentrackers list is really open
if (tr.registerFails++ > MAX_REGISTER_FAILS)
tr.stop = true;
//
}
if (++tr.consecutiveFails == MAX_CONSEC_FAILS) {
tr.seenPeers = 0;
if (tr.interval < LONG_SLEEP)
tr.interval = LONG_SLEEP; // slow down
}
}
} else {
if (_log.shouldLog(Log.INFO))
_log.info("Not announcing to " + tr.announce + " last announce was " +
new Date(tr.lastRequestTime) + " interval is " + DataHelper.formatDuration(tr.interval));
}
if ((!tr.stop) && maxSeenPeers < tr.seenPeers)
maxSeenPeers = tr.seenPeers;
} // *** end of trackers loop here
return maxSeenPeers;
}
/**
* @return max peers seen
*/
private int getPeersFromPEX() {
// Get peers from PEX
int rv = 0;
if (coordinator.needOutboundPeers() && (meta == null || !meta.isPrivate()) && !stop) {
Set<PeerID> pids = coordinator.getPEXPeers();
if (!pids.isEmpty()) {
if (_log.shouldLog(Log.INFO))
_log.info("Got " + pids.size() + " from PEX");
List<Peer> peers = new ArrayList(pids.size());
for (PeerID pID : pids) {
peers.add(new Peer(pID, snark.getID(), snark.getInfoHash(), snark.getMetaInfo()));
}
Random r = _util.getContext().random();
Collections.shuffle(peers, r);
Iterator<Peer> it = peers.iterator();
while ((!stop) && it.hasNext() && coordinator.needOutboundPeers()) {
Peer cur = it.next();
if (coordinator.addPeer(cur) && it.hasNext()) {
int delay = r.nextInt(DELAY_RAND) + DELAY_MIN;
try { Thread.sleep(delay); } catch (InterruptedException ie) {}
}
}
rv = pids.size();
pids.clear();
}
} else {
if (_log.shouldLog(Log.INFO))
_log.info("Not getting PEX peers");
}
return rv;
}
/**
* @return max peers seen
*/
private int getPeersFromDHT() {
// Get peers from DHT
// FIXME this needs to be in its own thread
int rv = 0;
DHT dht = _util.getDHT();
if (dht != null && (meta == null || !meta.isPrivate()) && (!stop) &&
_util.getContext().clock().now() > lastDHTAnnounce + MIN_DHT_ANNOUNCE_INTERVAL) {
int numwant;
if (!coordinator.needOutboundPeers())
numwant = 1;
else
numwant = _util.getMaxConnections();
Collection<Hash> hashes = dht.getPeers(snark.getInfoHash(), numwant, 2*60*1000);
if (!hashes.isEmpty()) {
runStarted = true;
lastDHTAnnounce = _util.getContext().clock().now();
rv = hashes.size();
}
if (_log.shouldLog(Log.INFO))
_log.info("Got " + hashes + " from DHT");
// announce ourselves while the token is still good
// FIXME this needs to be in its own thread
if (!stop) {
// announce only to the 1 closest
int good = dht.announce(snark.getInfoHash(), 1, 5*60*1000);
if (_log.shouldLog(Log.INFO))
_log.info("Sent " + good + " good announces to DHT");
}
// now try these peers
if ((!stop) && !hashes.isEmpty()) {
List<Peer> peers = new ArrayList(hashes.size());
for (Hash h : hashes) {
try {
PeerID pID = new PeerID(h.getData(), _util);
peers.add(new Peer(pID, snark.getID(), snark.getInfoHash(), snark.getMetaInfo()));
} catch (InvalidBEncodingException ibe) {}
}
Random r = _util.getContext().random();
Collections.shuffle(peers, r);
Iterator<Peer> it = peers.iterator();
while ((!stop) && it.hasNext() && coordinator.needOutboundPeers()) {
Peer cur = it.next();
if (coordinator.addPeer(cur) && it.hasNext()) {
int delay = r.nextInt(DELAY_RAND) + DELAY_MIN;
try { Thread.sleep(delay); } catch (InterruptedException ie) {}
}
}
}
} else {
if (_log.shouldLog(Log.INFO))
_log.info("Not getting DHT peers");
}
return rv;
}
/**
* Creates a thread for each tracker in parallel if tunnel is still open
* @since 0.9.1
*/
private void unannounce() {
// Local DHT tracker unannounce
DHT dht = _util.getDHT();
if (dht != null)
dht.unannounce(snark.getInfoHash());
int i = 0;
for (TCTracker tr : trackers) {
if (_util.connected() &&
tr.started && (!tr.stop) && tr.trackerProblems == null) {
try {
(new I2PAppThread(new Unannouncer(tr), _threadName + " U" + (++i), true)).start();
} catch (OutOfMemoryError oom) {
// probably ran out of threads, ignore
tr.reset();
}
} else {
tr.reset();
}
}
}
/**
* Send "stopped" to a single tracker
* @since 0.9.1
*/
private class Unannouncer implements Runnable {
private final TCTracker tr;
public Unannouncer(TCTracker tr) {
this.tr = tr;
}
public void run() {
if (_log.shouldLog(Log.DEBUG))
_log.debug("Running unannounce " + _threadName + " to " + tr.announce);
long uploaded = coordinator.getUploaded();
long downloaded = coordinator.getDownloaded();
long left = coordinator.getLeft();
try
{
// Don't try to restart I2CP connection just to say goodbye
if (_util.connected()) {
if (tr.started && (!tr.stop) && tr.trackerProblems == null)
doRequest(tr, infoHash, peerID, uploaded,
downloaded, left, STOPPED_EVENT);
}
}
catch(IOException ioe) { /* ignored */ }
tr.reset();
}
}
private TrackerInfo doRequest(TCTracker tr, String infoHash,
String peerID, long uploaded,
long downloaded, long left, String event)
throws IOException
{
StringBuilder buf = new StringBuilder(512);
buf.append(tr.announce);
if (tr.announce.contains("?"))
buf.append('&');
else
buf.append('?');
buf.append("info_hash=").append(infoHash)
.append("&peer_id=").append(peerID)
.append("&port=").append(port)
.append("&ip=" ).append(_util.getOurIPString()).append(".i2p")
.append("&uploaded=").append(uploaded)
.append("&downloaded=").append(downloaded)
.append("&left=");
// What do we send for left in magnet mode? Can we omit it?
if (left >= 0)
buf.append(left);
else
buf.append('1');
buf.append("&compact=1"); // NOTE: opentracker will return 400 for &compact alone
if (! event.equals(NO_EVENT))
buf.append("&event=").append(event);
buf.append("&numwant=");
boolean small = left == 0 || event.equals(STOPPED_EVENT) || !coordinator.needOutboundPeers();
if (small)
buf.append('0');
else
buf.append(_util.getMaxConnections());
String s = buf.toString();
if (_log.shouldLog(Log.INFO))
_log.info("Sending TrackerClient request: " + s);
tr.lastRequestTime = System.currentTimeMillis();
// Don't wait for a response to stopped when shutting down
boolean fast = _fastUnannounce && event.equals(STOPPED_EVENT);
byte[] fetched = _util.get(s, true, fast ? -1 : 0, small ? 128 : 1024, small ? 1024 : 8*1024);
if (fetched == null) {
throw new IOException("Error fetching " + s);
}
InputStream in = new ByteArrayInputStream(fetched);
TrackerInfo info = new TrackerInfo(in, snark.getID(),
snark.getInfoHash(), snark.getMetaInfo(), _util);
if (_log.shouldLog(Log.INFO))
_log.info("TrackerClient response: " + info);
String failure = info.getFailureReason();
if (failure != null)
throw new IOException(failure);
tr.interval = Math.max(MIN_TRACKER_ANNOUNCE_INTERVAL, info.getInterval() * 1000l);
return info;
}
/**
* Very lazy byte[] to URL encoder. Just encodes almost everything, even
* some "normal" chars.
* By not encoding about 1/4 of the chars, we make random data like hashes about 16% smaller.
*
* RFC1738: 0-9a-zA-Z$-_.+!*'(),
* Us: 0-9a-zA-Z
*
*/
public static String urlencode(byte[] bs)
{
StringBuilder sb = new StringBuilder(bs.length*3);
for (int i = 0; i < bs.length; i++)
{
int c = bs[i] & 0xFF;
if ((c >= '0' && c <= '9') ||
(c >= 'A' && c <= 'Z') ||
(c >= 'a' && c <= 'z')) {
sb.append((char)c);
} else {
sb.append('%');
if (c < 16)
sb.append('0');
sb.append(Integer.toHexString(c));
}
}
return sb.toString();
}
/**
* @param ann an announce URL
* @return true for i2p hosts only
* @since 0.7.12
*/
public static boolean isValidAnnounce(String ann) {
URL url;
try {
url = new URL(ann);
} catch (MalformedURLException mue) {
return false;
}
return url.getProtocol().equals("http") &&
(url.getHost().endsWith(".i2p") || url.getHost().equals("i2p")) &&
url.getPort() < 0;
}
/**
* @param ann an announce URL non-null
* @return a Hash for i2p hosts only, null otherwise
* @since 0.9.5
*/
private static Hash getHostHash(String ann) {
URL url;
try {
url = new URL(ann);
} catch (MalformedURLException mue) {
return null;
}
if (url.getPort() >= 0 || !url.getProtocol().equals("http"))
return null;
String host = url.getHost();
if (host.endsWith(".i2p"))
return ConvertToHash.getHash(host);
if (host.equals("i2p")) {
String path = url.getPath();
if (path == null || path.length() < 517 ||
!path.startsWith("/"))
return null;
String[] parts = path.substring(1).split("/?&;", 2);
return ConvertToHash.getHash(parts[0]);
}
return null;
}
private static class TCTracker
{
final String announce;
final boolean isPrimary;
long interval;
long lastRequestTime;
String trackerProblems;
boolean stop;
boolean started;
int registerFails;
int consecutiveFails;
int seenPeers;
public TCTracker(String a, boolean p)
{
announce = a;
isPrimary = p;
interval = INITIAL_SLEEP;
}
/**
* Call before restarting
* @since 0.9.1
*/
public void reset() {
lastRequestTime = 0;
trackerProblems = null;
stop = false;
started = false;
registerFails = 0;
consecutiveFails = 0;
seenPeers = 0;
}
}
}