ࡱ> M Rbjbj== .WWMl&&&&&&&:|7|7|7|7L7:>888888>88  $ҙ -!&88888-9&&88N9998&8&8989< 9$CM&&8|8 LҺ:B1|78"d0199::&&&&Internet Programming with Java Course 1.10 @8<5@: 07@01>B:0 =0 Forward AJ@2J@ Multithreaded Forward Server with Load Balancing and Failover Features  Multithreaded Forward Server Implementation  Nakov Forward Server /** * Nakov TCP Socket Forward Server - freeware * Version 1.0 - March, 2002 * (c) 2001 by Svetlin Nakov - http://www.nakov.com * * Short decription: Nakov Forward Server is designed to forward (redirect) TCP * connections from a client to a server choosen from a servers list. When a client * is connected to Nakov Forward Server, a new connection is opened to some of the * specified destination servers and all the traffic from destination server to * Nakov Forward Server is redirected to the client and also all the traffic from * the client to Nakov Forward Server is redirected to destination server. That * way Nakov Forward Server makes transparent redirection of TCP connections. * The data transfer schema is the following: * * CLIENT <--> NAKOV_FORWARD_SERVER <--> DESTINATION_SERVER * * Clients and Destination Servers communicate only with Nakov Forward Server. * * Nakov Forward Server supports failt tolerance. When some of the servers in the * list fail to respond to TCP connect request (dead server), Nakov Forward Server * tries the next server in the list until it finds alive server. All dead servers * are checked if they are alive through some time interval and when some server * becomes available, it is added to alive list. When no server is alive, no * connection will be established. * * Nakov Forward Server supports also load balancing features. If load balancing * is enabled, when a client connection is accepted, Nakov Forward Server will * redirect the client to the least loaded server from the servers list. We consider * the server which hast minimal alive connections established by Nakov Forward * Server is least loaded. * * What we gain when we use Nakov Proxy Server? * - Destination server does not know the real IP of the client. It thinks * that the IP of Nakov Forward Server is its client. Thus we can use a server * licensed for one IP address on several machines simultaneously. * - Nakov Forward Server can run on a port number that is allowed by the * firewall and forward to a port number that is not allowed by firewall. Thus, * started on a server in a local network, it can give access to some disabled * by the firewall services. * - Nakov Forward Server can give access to multiple clients to some service * that is allowed only for some fixed IP address when started on the machine * with this IP. * - Fault Tolerance (failover) of Nakov Forward Server helps to avoid faults * when some of the servers die. Of course there is special hardware for this, but * it has high price. Instead you can use Nakov Forward Server (that is free). * If you setup several Nakov Forward Servers configured to use the same set of * destination servers and if you configure your routers to use redirect traffic * to both servers, you will obtain a stable fault tolerance system. In such a * system you have guarantee that crash of any of the servers (including some of * the Nakov Forward Servers) will not stop the service that these servers provide. * Of course the destination servers should run in a cluster and replicate their * sessions. * - Load balancing helps to avoid overloading of the servers by distributing * the clients between them. Of course this should be done by special hardware * called "load balancer", but if we don't have such hardware, we can still use * this technology. When we use load balancing, all the servers in the list should * be running in a cluster and there should be no matter what of the servers the * client is connected to. The servers should communicate each other and replicate * their session data. * * NakovForwardServer.properties configuration file contains all the settings of * Nakov Forward Server. The only mandatory field is "Servers" * Destination servers should be in following format: * Servers = server1:port1, server2:port2, server3:port3, ... * For example: * Servers = 192.168.0.22:80, rakiya:80, 192.168.0.23:80, www.nakov.com:80 * Nakov Forward Server listening port should be in format: * ListeningPort = some_port (in range 1-65535) * Using load balancing algorithm is specified by following line: * LoadBalancing = Yes/No * Check alive interval through which all dead threads should be re-checked if * they are alive is specified by following line: * CheckAliveInterval = time_interval (in milliseconds) */ import java.util.ArrayList; import java.net.ServerSocket; import java.net.Socket; import java.net.InetAddress; import java.io.IOException; import java.io.FileInputStream; import java.util.Properties; import java.util.StringTokenizer; public class NakovForwardServer { private static final boolean ENABLE_LOGGING = true; public static final String SETTINGS_FILE_NAME = "NakovForwardServer.properties"; private ServerDescription[] mServersList = null; private int mListeningTcpPort = 2001; private boolean mUseLoadBalancingAlgorithm = true; private long mCheckAliveIntervalMs = 5*1000; /** * ServerDescription descripts a server (server hostname/IP, server port, * is the server alive at last check, how many clients are connected to it, etc.) */ class ServerDescription { public String host; public int port; public int clientsConectedCount = 0; public boolean isAlive = true; public ServerDescription(String host, int port) { this.host = host; this.port = port; } } /** * @return an array of ServerDescription - all destination servers. */ public ServerDescription[] getServersList() { return mServersList; } /** * @return the time interval (in milliseconds) through which all dead servers * should be re-checked if they are alive (a server is alive if accepts * client connections on the specified port, otherwise is dead). */ public long getCheckAliveIntervalMs() { return mCheckAliveIntervalMs; } /** * @return true if load balancing algorithm is enabled. */ public boolean isLoadBalancingEnabled() { return mUseLoadBalancingAlgorithm; } /** * Reads the Nakov Forward Server configuration file "NakovForwardServer.properties" * and load user preferences. This method is called once during the server startup. */ public void readSettings() throws Exception { // Read properties file in a Property object Properties props = new Properties(); props.load(new FileInputStream(SETTINGS_FILE_NAME)); // Read and parse the server list String serversProperty = props.getProperty("Servers"); if (serversProperty == null ) throw new Exception("The server list can not be empty."); try { ArrayList servers = new ArrayList(); StringTokenizer stServers = new StringTokenizer(serversProperty,","); while (stServers.hasMoreTokens()) { String serverAndPort = stServers.nextToken().trim(); StringTokenizer stServerPort = new StringTokenizer(serverAndPort,": "); String host = stServerPort.nextToken(); int port = Integer.parseInt(stServerPort.nextToken()); servers.add(new ServerDescription(host,port)); } mServersList = (ServerDescription[]) servers.toArray(new ServerDescription[] {}); } catch (Exception e) { throw new Exception("Invalid server list format : " + serversProperty); } if (mServersList.length == 0) throw new Exception("The server list can not be empty."); // Read server's listening port number try { mListeningTcpPort = Integer.parseInt(props.getProperty("ListeningPort")); } catch (Exception e) { log("Server listening port not specified. Using default port : " + mListeningTcpPort); } // Read load balancing property try { String loadBalancing = props.getProperty("LoadBalancing").toLowerCase(); mUseLoadBalancingAlgorithm = (loadBalancing.equals("yes") || loadBalancing.equals("true") || loadBalancing.equals("1") || loadBalancing.equals("enable") || loadBalancing.equals("enabled")); } catch (Exception e) { log("LoadBalancing property is not specified. Using default value : " + mUseLoadBalancingAlgorithm); } // Read the check alive interval try { mCheckAliveIntervalMs = Integer.parseInt(props.getProperty("CheckAliveInterval")); } catch (Exception e) { log("Check alive interval is not specified. Using default value : " + mCheckAliveIntervalMs + " ms."); } } /** * Starts a thread that re-checks all dead threads if they are alive * through mCheckAliveIntervalMs millisoconds */ private void startCheckAliveThread() { CheckAliveThread checkAliveThread = new CheckAliveThread(this); checkAliveThread.setDaemon(true); checkAliveThread.start(); } /** * Starts the forward server - binds on a given port and starts serving */ public void startForwardServer() throws Exception { // Bind server on given TCP port ServerSocket serverSocket; try { serverSocket = new ServerSocket(mListeningTcpPort); } catch (IOException ioe) { throw new IOException("Unable to bind to port " + mListeningTcpPort); } log("Nakov Forward Server started on TCP port " + mListeningTcpPort + "."); log("All TCP connections to " + InetAddress.getLocalHost().getHostAddress() + ":" + mListeningTcpPort + " will be forwarded to the following servers:"); for (int i=0; i dest server out" and * "dest server in <--> client out", waits until one of these threads stop * due to read/write failure or connection closure. Closes opened connections. */ public void run() { try { mClientHostPort = mClientSocket.getInetAddress().getHostAddress() + ":" + mClientSocket.getPort(); // Create a new socket connection to one of the servers from the list mServerSocket = createServerSocket(); if (mServerSocket == null) { // If all the servers are down System.out.println("Can not establish connection for client " + mClientHostPort + ". All the servers are down."); try { mClientSocket.close(); } catch (IOException e) {} return; } // Obtain input and output streams of server and client InputStream clientIn = mClientSocket.getInputStream(); OutputStream clientOut = mClientSocket.getOutputStream(); InputStream serverIn = mServerSocket.getInputStream(); OutputStream serverOut = mServerSocket.getOutputStream(); mServerHostPort = mServer.host + ":" + mServer.port; mNakovForwardServer.log("TCP Forwarding " + mClientHostPort + " <--> " + mServerHostPort + " started."); // Start forwarding of socket data between server and client ForwardThread clientForward = new ForwardThread(this, clientIn, serverOut); ForwardThread serverForward = new ForwardThread(this, serverIn, clientOut); mBothConnectionsAreAlive = true; clientForward.start(); serverForward.start(); } catch (IOException ioe) { ioe.printStackTrace(); } } /** * connectionBroken() method is called by forwarding child threads to notify * this thread (their parent thread) that one of the connections (server or client) * is broken (a read/write failure occured). This method disconnects both server * and client sockets causing both threads to stop forwarding. */ public synchronized void connectionBroken() { if (mBothConnectionsAreAlive) { // One of the connections is broken. Close the other connection // and stop forwarding // Closing these socket connections will close their input/output streams // and that way will stop the threads that read from these streams try { mServerSocket.close(); } catch (IOException e) {} try { mClientSocket.close(); } catch (IOException e) {} mBothConnectionsAreAlive = false; mServer.clientsConectedCount--; mNakovForwardServer.log("TCP Forwarding " + mClientHostPort + " <--> " + mServerHostPort + " stopped."); } } /** * @return a new socket connected to some of the servers in the destination * servers list. Sequentially a connection to the least loaded server from * the list is tried to be established. If connecting to some alive server * fail, this server it marked as dead and next alive server is tried. If all * the servers are dead, null is returned. Thus if at least one server is alive, * a connection will be established (of course after some delay) and the system * will not fail (it is fault tolerant). Dead servers can be marked as alive if * revived, but this is done later by check alive thread. */ private Socket createServerSocket() throws IOException { while (true) { mServer = getServerWithMinimalLoad(); if (mServer == null) // All the servers are down return null; try { Socket socket = new Socket(mServer.host, mServer.port); mServer.clientsConectedCount++; return socket; } catch (IOException ioe) { mServer.isAlive = false; } } } /** * @return the least loaded alive server from the server list if load balancing * is enabled or first alive server from the list if load balancing algorithm is * disabled or null if all the servers in the list are dead. */ private NakovForwardServer.ServerDescription getServerWithMinimalLoad() { NakovForwardServer.ServerDescription minLoadServer = null; NakovForwardServer.ServerDescription[] servers = mNakovForwardServer.getServersList(); for (int i=0; i exit the thread mOutputStream.write(buffer, 0, bytesRead); } } catch (IOException e) { // Read/write failed --> connection is broken --> exit the thread } // Notify parent thread that the connection is broken and forwarding should stop mParent.connectionBroken(); } } /** * CheckAliveThread checks all dead servers in the server list and updates the * list when some dead server becomes alive. Checking is done on a beforehand * specified time itrervals. A server is considered alive if it accepts client * connections on the specified port. */ import java.io.IOException; import java.net.Socket; public class CheckAliveThread extends Thread { private NakovForwardServer mNakovForwardServer = null; /** * Creates a check alive thread. 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