--- /dev/null
+package be.nikiroo.utils.serial.server;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.lang.reflect.Array;
+import java.net.Socket;
+import java.net.UnknownHostException;
+
+import be.nikiroo.utils.StringUtils;
+import be.nikiroo.utils.TraceHandler;
+import be.nikiroo.utils.Version;
+import be.nikiroo.utils.serial.Importer;
+
+/**
+ * This class implements a simple server that can bridge two other
+ * {@link Server}s.
+ * <p>
+ * It can, of course, inspect the data that goes through it (by default, it
+ * prints traces of the data).
+ * <p>
+ * Note: this {@link ServerBridge} has to be discarded after use (cannot be
+ * started twice).
+ *
+ * @author niki
+ */
+public class ServerBridge extends Server {
+ private final String forwardToHost;
+ private final int forwardToPort;
+ private final String forwardToKey;
+
+ /**
+ * Create a new server that will start listening on the network when
+ * {@link ServerBridge#start()} is called.
+ *
+ * @param port
+ * the port to listen on, or 0 to assign any unallocated port
+ * found (which can later on be queried via
+ * {@link ServerBridge#getPort()}
+ * @param key
+ * an optional key to encrypt all the communications (if NULL,
+ * everything will be sent in clear text)
+ * @param forwardToHost
+ * the host server to forward the calls to
+ * @param forwardToPort
+ * the host port to forward the calls to
+ * @param forwardToKey
+ * an optional key to encrypt all the communications (if NULL,
+ * everything will be sent in clear text)
+ *
+ * @throws IOException
+ * in case of I/O error
+ * @throws UnknownHostException
+ * if the IP address of the host could not be determined
+ * @throws IllegalArgumentException
+ * if the port parameter is outside the specified range of valid
+ * port values, which is between 0 and 65535, inclusive
+ */
+ public ServerBridge(int port, String key, String forwardToHost,
+ int forwardToPort, String forwardToKey) throws IOException {
+ super(port, key);
+ this.forwardToHost = forwardToHost;
+ this.forwardToPort = forwardToPort;
+ this.forwardToKey = forwardToKey;
+ }
+
+ /**
+ * Create a new server that will start listening on the network when
+ * {@link ServerBridge#start()} is called.
+ *
+ * @param name
+ * the server name (only used for debug info and traces)
+ * @param port
+ * the port to listen on
+ * @param key
+ * an optional key to encrypt all the communications (if NULL,
+ * everything will be sent in clear text)
+ * @param forwardToHost
+ * the host server to forward the calls to
+ * @param forwardToPort
+ * the host port to forward the calls to
+ * @param forwardToKey
+ * an optional key to encrypt all the communications (if NULL,
+ * everything will be sent in clear text) use an SSL connection
+ * for the forward server or not
+ *
+ * @throws IOException
+ * in case of I/O error
+ * @throws UnknownHostException
+ * if the IP address of the host could not be determined
+ * @throws IllegalArgumentException
+ * if the port parameter is outside the specified range of valid
+ * port values, which is between 0 and 65535, inclusive
+ */
+ public ServerBridge(String name, int port, String key,
+ String forwardToHost, int forwardToPort, String forwardToKey)
+ throws IOException {
+ super(name, port, key);
+ this.forwardToHost = forwardToHost;
+ this.forwardToPort = forwardToPort;
+ this.forwardToKey = forwardToKey;
+ }
+
+ /**
+ * The traces handler for this {@link Server}.
+ * <p>
+ * The trace levels are handled as follow:
+ * <ul>
+ * <li>1: it will only print basic IN/OUT messages with length</li>
+ * <li>2: it will try to interpret it as an object (SLOW) and print the
+ * object class if possible</li>
+ * <li>3: it will try to print the {@link Object#toString()} value, or the
+ * data if it is not an object</li>
+ * <li>4: it will also print the unzipped serialised value if it is an
+ * object</li>
+ * </ul>
+ *
+ * @param tracer
+ * the new traces handler
+ */
+ @Override
+ public void setTraceHandler(TraceHandler tracer) {
+ super.setTraceHandler(tracer);
+ }
+
+ @Override
+ protected ConnectActionServer createConnectActionServer(Socket s) {
+ // Bad impl, not up to date (should work, but not efficient)
+ return new ConnectActionServerString(s, key) {
+ @Override
+ public void action(Version clientVersion) throws Exception {
+ onClientContact(clientVersion);
+ final ConnectActionServerString bridge = this;
+
+ try {
+ new ConnectActionClientString(forwardToHost, forwardToPort,
+ forwardToKey) {
+ @Override
+ public void action(Version serverVersion)
+ throws Exception {
+ onServerContact(serverVersion);
+
+ for (String fromClient = bridge.rec(); fromClient != null; fromClient = bridge
+ .rec()) {
+ onRec(fromClient);
+ String fromServer = send(fromClient);
+ onSend(fromServer);
+ bridge.send(fromServer);
+ }
+
+ getTraceHandler().trace("=== DONE", 1);
+ getTraceHandler().trace("", 1);
+ }
+
+ @Override
+ protected void onError(Exception e) {
+ ServerBridge.this.onError(e);
+ }
+ }.connect();
+ } catch (Exception e) {
+ ServerBridge.this.onError(e);
+ }
+ }
+ };
+ }
+
+ /**
+ * This is the method that is called each time a client contact us.
+ */
+ protected void onClientContact(Version clientVersion) {
+ getTraceHandler().trace(">>> CLIENT " + clientVersion);
+ }
+
+ /**
+ * This is the method that is called each time a client contact us.
+ */
+ protected void onServerContact(Version serverVersion) {
+ getTraceHandler().trace("<<< SERVER " + serverVersion);
+ getTraceHandler().trace("");
+ }
+
+ /**
+ * This is the method that is called each time a client contact us.
+ *
+ * @param data
+ * the data sent by the client
+ */
+ protected void onRec(String data) {
+ trace(">>> CLIENT", data);
+ }
+
+ /**
+ * This is the method that is called each time the forwarded server contact
+ * us.
+ *
+ * @param data
+ * the data sent by the client
+ */
+ protected void onSend(String data) {
+ trace("<<< SERVER", data);
+ }
+
+ @Override
+ protected ConnectActionClient getConnectionToMe()
+ throws UnknownHostException, IOException {
+ return new ConnectActionClientString(new Socket((String) null,
+ getPort()), key);
+ }
+
+ @Override
+ public void run() {
+ getTraceHandler().trace(
+ getName() + ": will forward to " + forwardToHost + ":"
+ + forwardToPort + " ("
+ + (forwardToKey != null ? "encrypted" : "plain text")
+ + ")");
+ super.run();
+ }
+
+ /**
+ * Trace the data with the given prefix.
+ *
+ * @param prefix
+ * the prefix (client, server, version...)
+ * @param data
+ * the data to trace
+ */
+ private void trace(String prefix, String data) {
+ int size = data == null ? 0 : data.length();
+ String ssize = StringUtils.formatNumber(size) + "bytes";
+
+ getTraceHandler().trace(prefix + ": " + ssize, 1);
+
+ if (getTraceHandler().getTraceLevel() >= 2) {
+ try {
+ while (data.startsWith("ZIP:") || data.startsWith("B64:")) {
+ if (data.startsWith("ZIP:")) {
+ data = StringUtils.unzip64s(data.substring(4));
+ } else if (data.startsWith("B64:")) {
+ data = StringUtils.unzip64s(data.substring(4));
+ }
+ }
+
+ InputStream stream = new ByteArrayInputStream(
+ StringUtils.getBytes(data));
+ try {
+ Object obj = new Importer().read(stream).getValue();
+ if (obj == null) {
+ getTraceHandler().trace("NULL", 2);
+ getTraceHandler().trace("NULL", 3);
+ getTraceHandler().trace("NULL", 4);
+ } else {
+ if (obj.getClass().isArray()) {
+ getTraceHandler().trace(
+ "(" + obj.getClass() + ") with "
+ + Array.getLength(obj)
+ + "element(s)", 3);
+ } else {
+ getTraceHandler().trace("(" + obj.getClass() + ")",
+ 2);
+ }
+ getTraceHandler().trace("" + obj.toString(), 3);
+ getTraceHandler().trace(data, 4);
+ }
+ } finally {
+ stream.close();
+ }
+ } catch (NoSuchMethodException e) {
+ getTraceHandler().trace("(not an object)", 2);
+ getTraceHandler().trace(data, 3);
+ getTraceHandler().trace("", 4);
+ } catch (NoSuchFieldException e) {
+ getTraceHandler().trace(
+ "(incompatible: " + e.getMessage() + ")", 2);
+ getTraceHandler().trace(data, 3);
+ getTraceHandler().trace("", 4);
+ } catch (ClassNotFoundException e) {
+ getTraceHandler().trace(
+ "(unknown object: " + e.getMessage() + ")", 2);
+ getTraceHandler().trace(data, 3);
+ getTraceHandler().trace("", 4);
+ } catch (Exception e) {
+ getTraceHandler().trace(
+ "(decode error: " + e.getMessage() + ")", 2);
+ getTraceHandler().trace(data, 3);
+ getTraceHandler().trace("", 4);
+ }
+
+ getTraceHandler().trace("", 2);
+ }
+ }
+}
git://git.nikiroo.be / fanfix.git / blobdiff