Update server to punish clients

src/clientP2P/ClientDownload.java

@@ -126,8 +126,7 @@ public abstract class ClientDownload extends ServeErrors implements Runnable {
 			try {
 				sockList.get(rand.nextInt(sockList.size())).assignTask(offset);
 				offsetsPending.add(offset);
-				System.err.println("Assigned task "+ offset);
-				writeLog("Assigned task "+ offset, LogLevel.Info);
+				writeLog("Assigned task: #"+ offset, LogLevel.Info);
 			} catch(InterruptedException e) {
 				writeLog(e, LogLevel.Error);
 				throw new InternalError();
@@ -232,7 +231,6 @@ public abstract class ClientDownload extends ServeErrors implements Runnable {
 				writeLog(e, LogLevel.Error);
 				hash = new byte[0];
 			} catch (NotFound e) {
-				writeLog(e, LogLevel.Error);
 				hash = new byte[0];
 			} catch (LocalException e) {
 				writeLog(e, LogLevel.Error);
@@ -258,6 +256,7 @@ public abstract class ClientDownload extends ServeErrors implements Runnable {
 	 */
 	protected void purgeList() throws InternalError {
 		List<HostItem> blackList = new ArrayList<HostItem>();
+		writeLog("Potential peers (before purge): " + hostList.size(), LogLevel.Debug);
 		boolean first = false;
 		byte[] hashsum;
 		for(HostItem host: hostList) {
@@ -276,6 +275,7 @@ public abstract class ClientDownload extends ServeErrors implements Runnable {
 		for(HostItem host: blackList) {
 			hostList.remove(host);
 		}
+		writeLog("Peers (after purge): " + hostList.size(), LogLevel.Debug);
 		writeLog("Host list purge: done", LogLevel.Info);
 	}
 
@@ -368,17 +368,11 @@ public abstract class ClientDownload extends ServeErrors implements Runnable {
 	public void run() {
 		try {
 			init();
-			if (stop) {
-				writeLog("File is smaller than part max size.", LogLevel.Info);
-				closeHostItemSocket(hostList.get(0));
-			} else {
-				writeLog("File is bigger than part max size.", LogLevel.Info);
-				purgeList();
-				initThreads();
-				while(!stop) {
-					assignTasks();
-					checkTasksStatus();
-				}
+			purgeList();
+			initThreads();
+			while(!stop) {
+				assignTasks();
+				checkTasksStatus();
 			}
 			writeLog("Reassembling file parts.", LogLevel.Info);
 			reassembleFile();

src/clientP2P/ClientDownloadPart.java

@@ -8,6 +8,7 @@ import protocolP2P.ProtocolP2PPacket;
 import protocolP2P.Payload;
 import protocolP2P.LoadRequest;
 import protocolP2P.FilePart;
+import protocolP2P.Denied;
 import localException.InternalError;
 import localException.ProtocolError;
 import localException.TransmissionError;
@@ -203,7 +204,6 @@ public abstract class ClientDownloadPart extends ServeErrors implements Runnable
 				if (p == null) {
 					stop = true;
 				}
-
 				failed = downloadPart(p);
 				if (failed) {
 					System.err.println("Error: DownloadPart failed.");
@@ -224,7 +224,7 @@ public abstract class ClientDownloadPart extends ServeErrors implements Runnable
 	 * @return	ProtocolP2PPacketTCP used to send request
 	 */
 	protected ProtocolP2PPacket<?> reqPart(Long offset) {
-		writeLog("New request: " + offset, LogLevel.Info);
+		writeLog("New request: #" + offset, LogLevel.Info);
 		// maintain tracking of tasks
 		if (toDoTasks.contains(offset)) {
 			try {
@@ -279,6 +279,22 @@ public abstract class ClientDownloadPart extends ServeErrors implements Runnable
 		}
 		try {
 			Payload p = d.receiveResponse().getPayload();
+			if (p instanceof Denied) {
+				Denied denied = (Denied)p;
+				if (!denied.getFilename().equals(filename)) {
+					writeLog("wrong file deny response received: `" + denied.getFilename() + "`", LogLevel.Error);
+					return true;
+				}
+				Long offset = Long.valueOf(denied.getOffset());
+				if (pendingTasks.contains(offset)) {
+					pendingTasks.remove(offset);
+					toDoTasks.add(offset);
+					return false;
+				} else {
+					writeLog("wrong file offset deny received: " + offset, LogLevel.Error);
+					return true;
+				}
+			}
 			assert p instanceof FilePart : "This payload must be instance of FilePart";
 			if (!(p instanceof FilePart)) {
 				writeLog("cannot get size.", LogLevel.Error);

src/clientP2P/ClientManagement.java

@@ -26,6 +26,7 @@ import remoteException.NotFound;
 import remoteException.ProtocolRemoteError;
 import remoteException.VersionRemoteError;
 import remoteException.NotATracker;
+import remoteException.UnknownHost;
 import java.io.IOException;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
@@ -165,6 +166,9 @@ public abstract class ClientManagement extends ServeErrors implements Runnable {
 		} catch (NotATracker e) {
 			writeLog(e, LogLevel.Error);
 			throw new ProtocolError();
+		} catch (UnknownHost e) {
+			writeLog(e, LogLevel.Error);
+			throw new ProtocolError();
 		}
 	}
 
@@ -212,6 +216,7 @@ public abstract class ClientManagement extends ServeErrors implements Runnable {
 					throw new InternalError();
 				} else {
 					downLoader.sendRatioUpdate();
+					writeLog("Ratio updates sent.", LogLevel.Info);
 				}
 			} else {
 				throw new InternalError();

src/protocolP2P/DiscoverResponse.java

@@ -56,7 +56,7 @@ public class DiscoverResponse extends Payload {
 			int port = BytesArrayTools.readInt16Bits(packet, i);
 			i += 2;
 			String hostname = BytesArrayTools.readString(packet, i, "\n");
-			i += hostname.length();
+			i += hostname.length() + 1; // 1 for the "\n"
 			hostList.add(new HostItem(hostname, port));
 		}
 	}

src/protocolP2P/LoadRequest.java

@@ -72,7 +72,7 @@ public class LoadRequest extends Payload {
 		/* Read hostItem */
 		int portPosition = FILENAME_POSITION + size;
 		int hostnameStartPosition = portPosition + 2;
-		int hostnameSize = getPayloadSize(packet) - hostnameStartPosition;
+		int hostnameSize = getPayloadSize(packet) - hostnameStartPosition + PAYLOAD_START_POSITION;
 		hostItem = new HostItem(BytesArrayTools.readString(packet, hostnameStartPosition, hostnameSize), BytesArrayTools.readInt16Bits(packet, portPosition));
 	}
 

src/protocolP2P/ProtocolP2PPacket.java

@@ -12,6 +12,7 @@ import remoteException.ProtocolRemoteError;
 import remoteException.VersionRemoteError;
 import remoteException.EmptyFile;
 import remoteException.NotATracker;
+import remoteException.UnknownHost;
 import java.io.IOException;
 import tools.HostItem;
 
@@ -72,8 +73,9 @@ public abstract class ProtocolP2PPacket < T extends Payload>{
 	 * @throws	SizeError
 	 * @throws	IOException
 	 * @throws	SocketClosed
+	 * @throws	UnknownHost
 	 */
-	public abstract ProtocolP2PPacket<?> receiveResponse() throws EmptyFile, NotFound, NotATracker, EmptyDirectory, InternalRemoteError, VersionRemoteError, ProtocolRemoteError, TransmissionError, ProtocolError, VersionError, InternalError, SizeError, IOException, SocketClosed;
+	public abstract ProtocolP2PPacket<?> receiveResponse() throws EmptyFile, NotFound, NotATracker, EmptyDirectory, InternalRemoteError, VersionRemoteError, ProtocolRemoteError, TransmissionError, ProtocolError, VersionError, InternalError, SizeError, IOException, SocketClosed, UnknownHost;
 
 	/** Receive a request, subclasses must overwrite this constructor.
 	 * @param socket	socket used to get the request

src/protocolP2P/ProtocolP2PPacketTCP.java

@@ -12,6 +12,7 @@ import remoteException.NotFound;
 import remoteException.ProtocolRemoteError;
 import remoteException.VersionRemoteError;
 import remoteException.EmptyFile;
+import remoteException.UnknownHost;
 import tools.HostItem;
 import protocolP2P.Payload;
 import protocolP2P.RequestResponseCode;
@@ -212,8 +213,9 @@ public class ProtocolP2PPacketTCP < T extends Payload > extends ProtocolP2PPacke
 	 * @throws	SizeError
 	 * @throws	IOException
 	 * @throws	SocketClosed
+	 * @throws	UnknownHost
 	 */
-	public ProtocolP2PPacket<?> receiveResponse() throws EmptyFile, NotFound, NotATracker, EmptyDirectory, InternalRemoteError, VersionRemoteError, ProtocolRemoteError, TransmissionError, ProtocolError, VersionError, InternalError, SizeError, IOException, SocketClosed {
+	public ProtocolP2PPacket<?> receiveResponse() throws EmptyFile, NotFound, NotATracker, EmptyDirectory, InternalRemoteError, VersionRemoteError, ProtocolRemoteError, TransmissionError, ProtocolError, VersionError, InternalError, SizeError, IOException, SocketClosed, UnknownHost {
 		assert requestSocket != null : "Cannot receive response because request packet not sent.";
 		if (requestSocket == null) {
 			throw new InternalError();
@@ -253,6 +255,8 @@ public class ProtocolP2PPacketTCP < T extends Payload > extends ProtocolP2PPacke
 					throw new EmptyFile();
 				case NOT_A_TRACKER:
 					throw new NotATracker();
+				case UNKNOWN_HOST:
+					throw new UnknownHost();
 				default :
 					return (ProtocolP2PPacket)p;
 			}

src/protocolP2P/ProtocolP2PPacketUDP.java

@@ -12,6 +12,7 @@ import remoteException.NotFound;
 import remoteException.ProtocolRemoteError;
 import remoteException.VersionRemoteError;
 import remoteException.EmptyFile;
+import remoteException.UnknownHost;
 import tools.BytesArrayTools;
 import tools.HostItem;
 import protocolP2P.Payload;
@@ -207,8 +208,9 @@ public class ProtocolP2PPacketUDP < T extends Payload> extends ProtocolP2PPacket
 	 * @throws	InternalError
 	 * @throws	SizeError
 	 * @throws	IOException
+	 * @throws	UnknownHost
 	 */
-	public ProtocolP2PPacket<?> receiveResponse() throws EmptyFile, NotFound, NotATracker, EmptyDirectory, InternalRemoteError, VersionRemoteError, ProtocolRemoteError, TransmissionError, ProtocolError, VersionError, InternalError, SizeError, IOException {
+	public ProtocolP2PPacket<?> receiveResponse() throws EmptyFile, NotFound, NotATracker, EmptyDirectory, InternalRemoteError, VersionRemoteError, ProtocolRemoteError, TransmissionError, ProtocolError, VersionError, InternalError, SizeError, IOException, UnknownHost {
 		assert requestSocket != null : "Cannot receive response because request packet not sent.";
 		if (requestSocket == null) {
 			throw new InternalError();
@@ -237,6 +239,8 @@ public class ProtocolP2PPacketUDP < T extends Payload> extends ProtocolP2PPacket
 					throw new EmptyFile();
 				case NOT_A_TRACKER:
 					throw new NotATracker();
+				case UNKNOWN_HOST:
+					throw new UnknownHost();
 				default :
 					return (ProtocolP2PPacket)p;
 			}

src/serverP2P/RatioWatcher.java

@@ -0,0 +1,177 @@
+package serverP2P;
+import tools.Logger;
+import tools.LogLevel;
+import tools.HostItem;
+import java.util.Map;
+import java.util.HashMap;
+import java.io.IOException;
+import exception.RemoteException;
+import exception.LocalException;
+import protocolP2P.RatioRequest;
+import protocolP2P.RatioResponse;
+import protocolP2P.Payload;
+import protocolP2P.ProtocolP2PPacket;
+import remoteException.UnknownHost;
+import remoteException.NotATracker;
+import localException.InternalError;
+
+/** Class allowing to keep the tracker informed about ratios
+ * @author	Louis Royer
+ * @author	Flavien Haas
+ * @author	JS Auge
+ * @version	1.0
+ */
+public abstract class RatioWatcher implements Runnable {
+	final static double punishmentFactor = 1.2;
+	protected Logger logger;
+	protected volatile boolean stop;
+	protected long time;
+	protected boolean force;
+	protected HostItem tracker;
+	protected Thread thread;
+	protected Map<HostItem, Double> cachePunishmentProbability = new HashMap<>();
+	protected boolean lock;
+
+
+	/** Constructor
+	 * @param logger	Logger
+	 * @param millis	Time interval before recheck
+	 * @param tracker	HostItem for the tracker
+	 */
+	public RatioWatcher(Logger logger, long millis, HostItem tracker) {
+		assert logger != null : "Logger is null";
+		assert tracker != null : "Tracker is null";
+		this.logger = logger;
+		time = millis;
+		this.tracker = tracker;
+		lock = false;
+	}
+
+
+	/** Runnable implementation */
+	public void run() {
+		writeLog("Ratio watcher started : delay " + time + " milliseconds.", LogLevel.Info);
+		while(!stop) {
+			try {
+				clean();
+				Thread.sleep(time);
+			} catch(InterruptedException e) {
+				writeLog("Ratio watcher interrupted", LogLevel.Info);
+				setStop();
+			}
+		}
+	}
+
+	/** Invalidate the cache by cleaning all hashmaps
+	 * @throws InterruptedException
+	 */
+	protected synchronized void clean() throws InterruptedException{
+		while(lock) {
+			this.wait();
+		}
+		lock = true;
+		cachePunishmentProbability.clear();
+		lock = false;
+		this.notifyAll();
+	}
+		
+
+	/** Get Up-ratio for an applications
+	 * @param application	HostItem of the application
+	 * @return	Punishment Probability
+	 * @throws	UnknownHost
+	 */
+	protected synchronized double getPunishmentProbability(HostItem application) throws InternalError, UnknownHost {
+		try {
+			while(lock) {
+				this.wait();
+			}
+			lock = true;
+			if (!cachePunishmentProbability.containsKey(application)) {
+				// update if not in cache
+				try {
+					ProtocolP2PPacket<?> p = createProtocolP2PPacket(new RatioRequest(application));
+					p.sendRequest(getTrackerSocket());
+					Payload resp = p.receiveResponse().getPayload();
+					if (!(resp instanceof RatioResponse)) {
+						throw new InternalError();
+					}
+					RatioResponse rresp = (RatioResponse)resp;
+					if (!rresp.getHostItem().equals(application)) {
+						writeLog("Ratio response host is not the expected one. Expected : "
+							+ application + ". Received : " + rresp.getHostItem(), LogLevel.Debug);
+						throw new InternalError();
+					}
+					long up = rresp.getTotalUp();
+					long down = rresp.getTotalDown();
+					assert punishmentFactor > 1 : "The punishment factor must be greater than 1";
+					if (down == 0 || (punishmentFactor * up) >= down) {
+						cachePunishmentProbability.put(application, Double.valueOf(0));
+					} else {
+						cachePunishmentProbability.put(application, Double.valueOf((down - up)/(down * punishmentFactor)));
+					}
+				} catch (UnknownHost e) {
+					throw e;
+				} catch (IOException e) {
+					throw new InternalError();
+				} catch (LocalException e) {
+					writeLog(e, LogLevel.Error);
+					throw new InternalError();
+				} catch (RemoteException e) {
+					writeLog(e, LogLevel.Error);
+					throw new InternalError();
+				}
+			}
+			double ret = cachePunishmentProbability.get(application);
+			lock = false;
+			this.notifyAll();
+			return ret;
+		} catch (InterruptedException e) {
+		throw new InternalError();
+		}
+	}
+	
+	/** Ask the thread to stop
+	 */
+	public void setStop() {
+		stop = true;
+		if (thread != null) {
+			thread.interrupt();
+		}
+	}
+
+	/** Implementation of writeLog
+	 * @param text	Text to log
+	 * @param logLevel	level of logging
+	 */
+	protected abstract void writeLog(String text, LogLevel logLevel);
+
+	/** Implementation of writeLog
+	 * @param e	exception to log
+	 * @param logLevel	level of logging
+	 */
+	protected abstract void writeLog(Exception e, LogLevel logLevel);
+
+	/** Set thread
+	 * @param thread Thread
+	 */
+	public void setThread(Thread thread) {
+		this.thread = thread;
+	}
+
+	/** Create packets
+	 * @param payload	Payload
+	 */
+	protected abstract < T extends Payload > ProtocolP2PPacket<?> createProtocolP2PPacket(T payload);
+
+	/** Tracker socket getter
+	 * @return tracker socket
+	 */
+	protected abstract Object getTrackerSocket();
+
+	/** Closes tracker socket
+	 */
+	protected abstract void closeTrackerSocket();
+
+
+}

src/serverP2P/RatioWatcherTCP.java

@@ -0,0 +1,66 @@
+package serverP2P;
+import tools.Logger;
+import tools.LogLevel;
+import protocolP2P.ProtocolP2PPacket;
+import protocolP2P.ProtocolP2PPacketTCP;
+import protocolP2P.Payload;
+import tools.HostItem;
+import serverP2P.RatioWatcher;
+
+/** Class allowing to keep the tracker informed about file list (TCP impl.)
+ * @author	Louis Royer
+ * @author	Flavien Haas
+ * @author	JS Auge
+ * @version	1.0
+ */
+public class RatioWatcherTCP extends RatioWatcher {
+
+	/** Constructor
+	 * @param logger	Logger
+	 * @param millis	Time interval before recheck
+	 * @param tracker	HostItem for the tracker
+	 */
+	public RatioWatcherTCP(Logger logger, long millis, HostItem tracker) {
+		super(logger, millis, tracker);
+		assert logger != null : "Logger is null";
+		assert tracker != null : "Tracker is null";
+	}
+
+	/** Implementation of writeLog
+	 * @param text	Text to log
+	 * @param logLevel	level of logging
+	 */
+	protected void writeLog(String text, LogLevel logLevel) {
+		logger.writeTCP(text, logLevel);
+	}
+
+	/** Implementation of writeLog
+	 * @param e	exception to log
+	 * @param logLevel	level of logging
+	 */
+	protected void writeLog(Exception e, LogLevel logLevel) {
+		logger.writeTCP(e, logLevel);
+	}
+
+	/** Create packets
+	 * @param payload	Payload
+	 */
+	protected < T extends Payload > ProtocolP2PPacket<T> createProtocolP2PPacket(T payload) {
+		return (ProtocolP2PPacket<T>)new ProtocolP2PPacketTCP<T>(payload);
+	}
+
+	/** Tracker socket getter
+	 * @return tracker socket
+	 */
+	protected Object getTrackerSocket() {
+		return tracker.getTCPSocket();
+	}
+
+	/** Closes tracker socket
+	 */
+	protected void closeTrackerSocket() {
+		tracker.closeTCPSocket();
+	}
+
+
+}

src/serverP2P/RatioWatcherUDP.java

@@ -0,0 +1,64 @@
+package serverP2P;
+import tools.Logger;
+import tools.LogLevel;
+import protocolP2P.ProtocolP2PPacket;
+import protocolP2P.ProtocolP2PPacketUDP;
+import protocolP2P.Payload;
+import tools.HostItem;
+import serverP2P.RatioWatcher;
+
+/** Class allowing to keep the tracker informed about file list (UDP impl.)
+ * @author	Louis Royer
+ * @author	Flavien Haas
+ * @author	JS Auge
+ * @version	1.0
+ */
+public class RatioWatcherUDP extends RatioWatcher {
+
+	/** Constructor
+	 * @param logger	Logger
+	 * @param millis	Time interval before recheck
+	 * @param tracker	HostItem for the tracker
+	 */
+	public RatioWatcherUDP(Logger logger, long millis, HostItem tracker) {
+		super(logger, millis, tracker);
+		assert logger != null : "Logger is null";
+		assert tracker != null : "Tracker is null";
+	}
+
+	/** Implementation of writeLog
+	 * @param text	Text to log
+	 * @param logLevel	level of logging
+	 */
+	protected void writeLog(String text, LogLevel logLevel) {
+		logger.writeUDP(text, logLevel);
+	}
+
+	/** Implementation of writeLog
+	 * @param e	exception to log
+	 * @param logLevel	level of logging
+	 */
+	protected void writeLog(Exception e, LogLevel logLevel) {
+		logger.writeUDP(e, logLevel);
+	}
+
+	/** Create packets
+	 * @param payload	Payload
+	 */
+	protected < T extends Payload > ProtocolP2PPacket<T> createProtocolP2PPacket(T payload) {
+		return (ProtocolP2PPacket<T>)new ProtocolP2PPacketUDP<T>(payload);
+	}
+
+	/** Tracker socket getter
+	 * @return tracker socket
+	 */
+	protected Object getTrackerSocket() {
+		return tracker.getUDPSocket();
+	}
+
+	/** Closes tracker socket
+	 */
+	protected void closeTrackerSocket() {
+		tracker.closeUDPSocket();
+	}
+}

src/serverP2P/ServerManagement.java

@@ -1,5 +1,6 @@
 package serverP2P;
 import serverP2P.FileWatcher;
+import serverP2P.RatioWatcher;
 import tools.Logger;
 import tools.LogLevel;
 import tools.HostItem;
@@ -16,14 +17,18 @@ import protocolP2P.HashAlgorithm;
 import protocolP2P.Unregister;
 import protocolP2P.SizeRequest;
 import protocolP2P.SizeResponse;
+import protocolP2P.Denied;
 import java.nio.file.Paths;
 import java.nio.file.Files;
 import java.io.File;
 import java.util.Arrays;
 import java.util.Map;
 import java.util.HashMap;
+import java.util.Random;
 import java.io.IOException;
 import exception.LocalException;
+import localException.InternalError;
+import remoteException.UnknownHost;
 
 /** Implementation of P2P-JAVA-PROJECT VERSION 1.0 protocol.
  * @author	Louis Royer
@@ -39,6 +44,8 @@ public abstract class ServerManagement extends ServeErrors implements Runnable {
 	protected String baseDirectory;
 	protected HostItem server;
 	protected HostItem tracker;
+	protected Random punisher = new Random();
+	protected RatioWatcher ratioWatcher;
 
 	/** Constructor */
 	public ServerManagement(String baseDirectory, HostItem server, HostItem tracker, Logger logger) {
@@ -58,6 +65,7 @@ public abstract class ServerManagement extends ServeErrors implements Runnable {
 	public void setStop() {
 		stop = true;
 		fileListWatcher.setStop();
+		ratioWatcher.setStop();
 		sendUnregisterRequest();
 		closeSocket();
 	}
@@ -145,27 +153,48 @@ public abstract class ServerManagement extends ServeErrors implements Runnable {
 			long offset = ((LoadRequest)p).getOffset();
 			long maxSizePartialContent = ((LoadRequest)p).getMaxSizePartialContent();
 			try {
-				byte[] fullLoad = Files.readAllBytes(Paths.get(baseDirectory + filename));
-				long sizeToSend = 0;
-				if (fullLoad.length - offset < maxSizePartialContent) {
-					writeLog("Sending last partialContent", LogLevel.Debug);
-					sizeToSend = fullLoad.length - offset;
-				} else {
-					sizeToSend = maxSizePartialContent;
-				}
-				writeLog("maxSizePartialContent: " + maxSizePartialContent, LogLevel.Debug);
-				writeLog("Sending " + filename + " from " + offset + " to " + (offset + sizeToSend), LogLevel.Debug);
-				byte[] load = Arrays.copyOfRange(fullLoad, (int)offset, (int)(offset + sizeToSend));
 				String[] fileList = fileListWatcher.getFileList();
 				if (Arrays.binarySearch(fileList, filename) >= 0) {
 					try {
-						if (load.length == 0) {
-							sendEmptyFile(pd);
+						double proba = ratioWatcher.getPunishmentProbability(((LoadRequest)p).getHostItem());
+						if (punisher.nextDouble() <= proba) {
+							writeLog("Sending punishment", LogLevel.Debug);
+							pd.sendResponse(createProtocolP2PPacket(new Denied(filename, offset)));
 						} else {
-							pd.sendResponse(createProtocolP2PPacket((Payload)(new FilePart(filename, offset, load))));
+							byte[] fullLoad = Files.readAllBytes(Paths.get(baseDirectory + filename));
+							long sizeToSend = 0;
+							if (fullLoad.length - offset < maxSizePartialContent) {
+								writeLog("Sending last partialContent", LogLevel.Debug);
+								sizeToSend = fullLoad.length - offset;
+							} else {
+								sizeToSend = maxSizePartialContent;
+							}
+							writeLog("maxSizePartialContent: " + maxSizePartialContent, LogLevel.Debug);
+							writeLog("Sending " + filename + " from " + offset + " to " + (offset + sizeToSend), LogLevel.Debug);
+							byte[] load = Arrays.copyOfRange(fullLoad, (int)offset, (int)(offset + sizeToSend));
+							try {
+								if (load.length == 0) {
+									sendEmptyFile(pd);
+								} else {
+									pd.sendResponse(createProtocolP2PPacket((Payload)(new FilePart(filename, offset, load))));
+								}
+							} catch (Exception e2) {
+								writeLog(e2, LogLevel.Error);
+							}
 						}
-					} catch (Exception e2) {
-						writeLog(e2, LogLevel.Error);
+					} catch (InternalError e) {
+						writeLog("InternalError", LogLevel.Debug);
+						writeLog(e, LogLevel.Debug);
+						sendInternalError(pd);
+						return;
+					} catch (UnknownHost e) {
+						writeLog("Unknown host: " + ((LoadRequest)p).getHostItem(), LogLevel.Debug);
+						writeLog(e, LogLevel.Debug);
+						sendInternalError(pd);
+						return;
+					} catch(LocalException e) {
+						sendInternalError(pd);
+						return;
 					}
 				} else {
 					writeLog("File requested not found: `" + filename + "` " + Arrays.binarySearch(fileList, filename), LogLevel.Debug);

src/serverP2P/ServerManagementTCP.java

@@ -82,6 +82,10 @@ public class ServerManagementTCP extends ServerManagement {
 		Thread flwt = new Thread(fileListWatcher);
 		flwt.start();
 		fileListWatcher.setThread(flwt);
+		ratioWatcher = (RatioWatcher)new RatioWatcherTCP(logger, 10000, tracker);
+		Thread rwt = new Thread(ratioWatcher);
+		rwt.start();
+		ratioWatcher.setThread(rwt);
 		while(!stop) {
 			try {
 				Socket s = socket.accept();

src/serverP2P/ServerManagementUDP.java

@@ -77,6 +77,10 @@ public class ServerManagementUDP extends ServerManagement {
 		Thread flwt = new Thread(fileListWatcher);
 		flwt.start();
 		fileListWatcher.setThread(flwt);
+		ratioWatcher = (RatioWatcher)new RatioWatcherUDP(logger, 10000, tracker);
+		Thread rwt = new Thread(ratioWatcher);
+		rwt.start();
+		ratioWatcher.setThread(rwt);
 		while(!stop) {
 			try {
 				ProtocolP2PPacketUDP<?> pd = new ProtocolP2PPacketUDP<>((Object)socket);

src/tools/HostItem.java

@@ -128,7 +128,7 @@ public class HostItem {
 		boolean result = false;
 		if (other instanceof HostItem) {
 			HostItem that = (HostItem) other;
-			result = this.getHostname() == that.getHostname() && this.getPort() == that.getPort();
+			result = this.getHostname().equals(that.getHostname()) && this.getPort() == that.getPort();
 		}
 		return result;
 	}

src/tracker/TrackerManagement.java

@@ -79,8 +79,14 @@ public abstract class TrackerManagement extends ServeErrors implements Runnable
 			sendInternalError(pd);
 		} else {
 			HostItem host = ((RatioRequest)p).getHostItem();
+			writeLog("Ratio request for host " + host, LogLevel.Debug);
 			try {
 				if (!hostList.contains(host)) {
+					String l = "";
+					for (HostItem h: hostList) {
+						l += h + " ";
+					}
+					writeLog(host + " is not in hostlist [ " + l + "]", LogLevel.Debug);
 					pd.sendResponse(createProtocolP2PPacket(new Payload(RequestResponseCode.UNKNOWN_HOST)));
 				} else {
 					pd.sendResponse(createProtocolP2PPacket(new RatioResponse(host,