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Code Issues Releases Wiki Activity

Make PacketReader and PacketWriter nested classes

Browse source 
of XMPPTCPConnection.
This commit is contained in:
Florian Schmaus 2014-05-26 22:02:04 +02:00
parent 6fd4bb850e
commit ca4fbcf2b0
4 changed files with 546 additions and 683 deletions
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363
smack-tcp/src/main/java/org/jivesoftware/smack/tcp/PacketReader.java
View file

@ -1,363 +0,0 @@
/**
*
* Copyright 2003-2007 Jive Software.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jivesoftware.smack.tcp;
import java.io.IOException;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smack.parsing.ParsingExceptionCallback;
import org.jivesoftware.smack.parsing.UnparsablePacket;
import org.jivesoftware.smack.sasl.SASLMechanism.Challenge;
import org.jivesoftware.smack.sasl.SASLMechanism.SASLFailure;
import org.jivesoftware.smack.sasl.SASLMechanism.Success;
import org.jivesoftware.smack.util.PacketParserUtils;
import org.jivesoftware.smack.ConnectionConfiguration;
import org.jivesoftware.smack.SmackException;
import org.jivesoftware.smack.SmackException.NoResponseException;
import org.jivesoftware.smack.SmackException.SecurityRequiredException;
import org.jivesoftware.smack.XMPPException.StreamErrorException;
import org.xmlpull.v1.XmlPullParserFactory;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
/**
* Listens for XML traffic from the XMPP server and parses it into packet objects.
* The packet reader also invokes all packet listeners and collectors.<p>
*
* @see XMPPConnection#createPacketCollector
* @see XMPPConnection#addPacketListener
* @author Matt Tucker
*/
class PacketReader {
private Thread readerThread;
private XMPPTCPConnection connection;
private XmlPullParser parser;
/**
* Set to true if the last features stanza from the server has been parsed. A XMPP connection
* handshake can invoke multiple features stanzas, e.g. when TLS is activated a second feature
* stanza is send by the server. This is set to true once the last feature stanza has been
* parsed.
*/
private volatile boolean lastFeaturesParsed;
volatile boolean done;
protected PacketReader(final XMPPTCPConnection connection) throws SmackException {
this.connection = connection;
this.init();
}
/**
* Initializes the reader in order to be used. The reader is initialized during the
* first connection and when reconnecting due to an abruptly disconnection.
*
* @throws SmackException if the parser could not be reset.
*/
protected void init() throws SmackException {
done = false;
lastFeaturesParsed = false;
readerThread = new Thread() {
public void run() {
parsePackets(this);
}
};
readerThread.setName("Smack Packet Reader (" + connection.getConnectionCounter() + ")");
readerThread.setDaemon(true);
resetParser();
}
/**
* Starts the packet reader thread and returns once a connection to the server
* has been established or if the server's features could not be parsed within
* the connection's PacketReplyTimeout.
*
* @throws NoResponseException if the server fails to send an opening stream back
* within packetReplyTimeout.
* @throws IOException
*/
synchronized public void startup() throws NoResponseException, IOException {
readerThread.start();
try {
// Wait until either:
// - the servers last features stanza has been parsed
// - an exception is thrown while parsing
// - the timeout occurs
wait(connection.getPacketReplyTimeout());
}
catch (InterruptedException ie) {
// Ignore.
}
if (!lastFeaturesParsed) {
connection.throwConnectionExceptionOrNoResponse();
}
}
/**
* Shuts the packet reader down. This method simply sets the 'done' flag to true.
*/
public void shutdown() {
done = true;
}
/**
* Resets the parser using the latest connection's reader. Reseting the parser is necessary
* when the plain connection has been secured or when a new opening stream element is going
* to be sent by the server.
*
* @throws SmackException if the parser could not be reset.
*/
private void resetParser() throws SmackException {
try {
parser = XmlPullParserFactory.newInstance().newPullParser();
parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, true);
parser.setInput(connection.getReader());
}
catch (XmlPullParserException e) {
throw new SmackException(e);
}
}
/**
* Parse top-level packets in order to process them further.
*
* @param thread the thread that is being used by the reader to parse incoming packets.
*/
private void parsePackets(Thread thread) {
try {
int eventType = parser.getEventType();
do {
if (eventType == XmlPullParser.START_TAG) {
int parserDepth = parser.getDepth();
String name = parser.getName();
ParsingExceptionCallback callback = connection.getParsingExceptionCallback();
Packet packet;
try {
packet = PacketParserUtils.parseStanza(parser, connection);
} catch (Exception e) {
String content = PacketParserUtils.parseContentDepth(parser, parserDepth);
UnparsablePacket message = new UnparsablePacket(content, e);
if (callback != null) {
callback.handleUnparsablePacket(message);
}
continue;
}
if (packet != null) {
connection.processPacket(packet);
}
// We found an opening stream. Record information about it, then notify
// the connectionID lock so that the packet reader startup can finish.
else if (name.equals("stream")) {
// Ensure the correct jabber:client namespace is being used.
if ("jabber:client".equals(parser.getNamespace(null))) {
// Get the connection id.
for (int i=0; i<parser.getAttributeCount(); i++) {
if (parser.getAttributeName(i).equals("id")) {
// Save the connectionID
connection.connectionID = parser.getAttributeValue(i);
}
else if (parser.getAttributeName(i).equals("from")) {
// Use the server name that the server says that it is.
connection.setServiceName(parser.getAttributeValue(i));
}
}
}
}
else if (name.equals("error")) {
throw new StreamErrorException(PacketParserUtils.parseStreamError(parser));
}
else if (name.equals("features")) {
parseFeatures(parser);
}
else if (name.equals("proceed")) {
// Secure the connection by negotiating TLS
connection.proceedTLSReceived();
// Reset the state of the parser since a new stream element is going
// to be sent by the server
resetParser();
}
else if (name.equals("failure")) {
String namespace = parser.getNamespace(null);
if ("urn:ietf:params:xml:ns:xmpp-tls".equals(namespace)) {
// TLS negotiation has failed. The server will close the connection
throw new Exception("TLS negotiation has failed");
}
else if ("http://jabber.org/protocol/compress".equals(namespace)) {
// Stream compression has been denied. This is a recoverable
// situation. It is still possible to authenticate and
// use the connection but using an uncompressed connection
connection.streamCompressionNegotiationDone();
}
else {
// SASL authentication has failed. The server may close the connection
// depending on the number of retries
final SASLFailure failure = PacketParserUtils.parseSASLFailure(parser);
connection.processPacket(failure);
connection.getSASLAuthentication().authenticationFailed(failure);
}
}
else if (name.equals("challenge")) {
// The server is challenging the SASL authentication made by the client
String challengeData = parser.nextText();
connection.processPacket(new Challenge(challengeData));
connection.getSASLAuthentication().challengeReceived(challengeData);
}
else if (name.equals("success")) {
connection.processPacket(new Success(parser.nextText()));
// We now need to bind a resource for the connection
// Open a new stream and wait for the response
connection.packetWriter.openStream();
// Reset the state of the parser since a new stream element is going
// to be sent by the server
resetParser();
// The SASL authentication with the server was successful. The next step
// will be to bind the resource
connection.getSASLAuthentication().authenticated();
}
else if (name.equals("compressed")) {
// Server confirmed that it's possible to use stream compression. Start
// stream compression
connection.startStreamCompression();
// Reset the state of the parser since a new stream element is going
// to be sent by the server
resetParser();
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("stream")) {
// Disconnect the connection
connection.disconnect();
}
}
eventType = parser.next();
} while (!done && eventType != XmlPullParser.END_DOCUMENT && thread == readerThread);
}
catch (Exception e) {
// The exception can be ignored if the the connection is 'done'
// or if the it was caused because the socket got closed
if (!(done || connection.isSocketClosed())) {
synchronized(this) {
this.notify();
}
// Close the connection and notify connection listeners of the
// error.
connection.notifyConnectionError(e);
}
}
}
private void parseFeatures(XmlPullParser parser) throws Exception {
boolean startTLSReceived = false;
boolean startTLSRequired = false;
boolean done = false;
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
if (parser.getName().equals("starttls")) {
startTLSReceived = true;
}
else if (parser.getName().equals("mechanisms")) {
// The server is reporting available SASL mechanisms. Store this information
// which will be used later while logging (i.e. authenticating) into
// the server
connection.getSASLAuthentication()
.setAvailableSASLMethods(PacketParserUtils.parseMechanisms(parser));
}
else if (parser.getName().equals("bind")) {
// The server requires the client to bind a resource to the stream
connection.serverRequiresBinding();
}
// Set the entity caps node for the server if one is send
// See http://xmpp.org/extensions/xep-0115.html#stream
else if (parser.getName().equals("c")) {
String node = parser.getAttributeValue(null, "node");
String ver = parser.getAttributeValue(null, "ver");
if (ver != null && node != null) {
String capsNode = node + "#" + ver;
// In order to avoid a dependency from smack to smackx
// we have to set the services caps node in the connection
// and not directly in the EntityCapsManager
connection.setServiceCapsNode(capsNode);
}
}
else if (parser.getName().equals("session")) {
// The server supports sessions
connection.serverSupportsSession();
}
else if (parser.getName().equals("ver")) {
if (parser.getNamespace().equals("urn:xmpp:features:rosterver")) {
connection.setRosterVersioningSupported();
}
}
else if (parser.getName().equals("compression")) {
// The server supports stream compression
connection.setAvailableCompressionMethods(PacketParserUtils.parseCompressionMethods(parser));
}
else if (parser.getName().equals("register")) {
connection.serverSupportsAccountCreation();
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("starttls")) {
// Confirm the server that we want to use TLS
connection.startTLSReceived(startTLSRequired);
}
else if (parser.getName().equals("required") && startTLSReceived) {
startTLSRequired = true;
}
else if (parser.getName().equals("features")) {
done = true;
}
}
}
// If TLS is required but the server doesn't offer it, disconnect
// from the server and throw an error. First check if we've already negotiated TLS
// and are secure, however (features get parsed a second time after TLS is established).
if (!connection.isSecureConnection()) {
if (!startTLSReceived && connection.getConfiguration().getSecurityMode() ==
ConnectionConfiguration.SecurityMode.required)
{
throw new SecurityRequiredException();
}
}
// Release the lock after TLS has been negotiated or we are not interested in TLS. If the
// server announced TLS and we choose to use it, by sending 'starttls', which the server
// replied with 'proceed', the server is required to send a new stream features element that
// "MUST NOT include the STARTTLS feature" (RFC6120 5.4.3.3. 5.). We are therefore save to
// release the connection lock once either TLS is disabled or we received a features stanza
// without starttls.
if (!startTLSReceived || connection.getConfiguration().getSecurityMode() ==
ConnectionConfiguration.SecurityMode.disabled)
{
lastFeaturesParsed = true;
// This synchronized block prevents this thread from calling notify() before the other
// thread had called wait() (it would cause an Exception if wait() hadn't been called)
synchronized (this) {
notify();
}
}
}
}

238
smack-tcp/src/main/java/org/jivesoftware/smack/tcp/PacketWriter.java
View file

@ -1,238 +0,0 @@
/**
*
* Copyright 2003-2007 Jive Software.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jivesoftware.smack.tcp;
import org.jivesoftware.smack.SmackException.NotConnectedException;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smack.util.ArrayBlockingQueueWithShutdown;
import java.io.IOException;
import java.io.Writer;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Writes packets to a XMPP server. Packets are sent using a dedicated thread. Packet
* interceptors can be registered to dynamically modify packets before they're actually
* sent. Packet listeners can be registered to listen for all outgoing packets.
*
* @see XMPPConnection#addPacketInterceptor
* @see XMPPConnection#addPacketSendingListener
*
* @author Matt Tucker
*/
class PacketWriter {
public static final int QUEUE_SIZE = 500;
private static final Logger LOGGER = Logger.getLogger(PacketWriter.class.getName());
private final XMPPTCPConnection connection;
private final ArrayBlockingQueueWithShutdown<Packet> queue = new ArrayBlockingQueueWithShutdown<Packet>(QUEUE_SIZE, true);
private Thread writerThread;
private Writer writer;
volatile boolean done;
AtomicBoolean shutdownDone = new AtomicBoolean(false);
/**
* Creates a new packet writer with the specified connection.
*
* @param connection the connection.
*/
protected PacketWriter(XMPPTCPConnection connection) {
this.connection = connection;
init();
}
/**
* Initializes the writer in order to be used. It is called at the first connection and also
* is invoked if the connection is disconnected by an error.
*/
protected void init() {
writer = connection.getWriter();
done = false;
shutdownDone.set(false);
queue.start();
writerThread = new Thread() {
public void run() {
writePackets(this);
}
};
writerThread.setName("Smack Packet Writer (" + connection.getConnectionCounter() + ")");
writerThread.setDaemon(true);
}
/**
* Sends the specified packet to the server.
*
* @param packet the packet to send.
* @throws NotConnectedException
*/
public void sendPacket(Packet packet) throws NotConnectedException {
if (done) {
throw new NotConnectedException();
}
try {
queue.put(packet);
}
catch (InterruptedException ie) {
throw new NotConnectedException();
}
}
/**
* Starts the packet writer thread and opens a connection to the server. The
* packet writer will continue writing packets until {@link #shutdown} or an
* error occurs.
*/
public void startup() {
writerThread.start();
}
void setWriter(Writer writer) {
this.writer = writer;
}
/**
* Shuts down the packet writer. Once this method has been called, no further
* packets will be written to the server.
*/
public void shutdown() {
done = true;
queue.shutdown();
synchronized(shutdownDone) {
if (!shutdownDone.get()) {
try {
shutdownDone.wait(connection.getPacketReplyTimeout());
}
catch (InterruptedException e) {
LOGGER.log(Level.WARNING, "shutdown", e);
}
}
}
}
/**
* Returns the next available packet from the queue for writing.
*
* @return the next packet for writing.
*/
private Packet nextPacket() {
if (done) {
return null;
}
Packet packet = null;
try {
packet = queue.take();
}
catch (InterruptedException e) {
// Do nothing
}
return packet;
}
private void writePackets(Thread thisThread) {
try {
// Open the stream.
openStream();
// Write out packets from the queue.
while (!done && (writerThread == thisThread)) {
Packet packet = nextPacket();
if (packet != null) {
writer.write(packet.toXML().toString());
if (queue.isEmpty()) {
writer.flush();
}
}
}
// Flush out the rest of the queue. If the queue is extremely large, it's possible
// we won't have time to entirely flush it before the socket is forced closed
// by the shutdown process.
try {
while (!queue.isEmpty()) {
Packet packet = queue.remove();
writer.write(packet.toXML().toString());
}
writer.flush();
}
catch (Exception e) {
LOGGER.log(Level.WARNING, "Exception flushing queue during shutdown, ignore and continue", e);
}
// Delete the queue contents (hopefully nothing is left).
queue.clear();
// Close the stream.
try {
writer.write("</stream:stream>");
writer.flush();
}
catch (Exception e) {
LOGGER.log(Level.WARNING, "Exception writing closing stream element", e);
}
finally {
try {
writer.close();
}
catch (Exception e) {
// Do nothing
}
}
shutdownDone.set(true);
synchronized(shutdownDone) {
shutdownDone.notify();
}
}
catch (IOException ioe) {
// The exception can be ignored if the the connection is 'done'
// or if the it was caused because the socket got closed
if (!(done || connection.isSocketClosed())) {
shutdown();
connection.notifyConnectionError(ioe);
}
}
}
/**
* Sends to the server a new stream element. This operation may be requested several times
* so we need to encapsulate the logic in one place. This message will be sent while doing
* TLS, SASL and resource binding.
*
* @throws IOException If an error occurs while sending the stanza to the server.
*/
void openStream() throws IOException {
StringBuilder stream = new StringBuilder();
stream.append("<stream:stream");
stream.append(" to=\"").append(connection.getServiceName()).append("\"");
stream.append(" xmlns=\"jabber:client\"");
stream.append(" xmlns:stream=\"http://etherx.jabber.org/streams\"");
stream.append(" version=\"1.0\">");
writer.write(stream.toString());
writer.flush();
}
}

623
smack-tcp/src/main/java/org/jivesoftware/smack/tcp/XMPPTCPConnection.java
View file

@ -20,21 +20,31 @@ import org.jivesoftware.smack.AbstractXMPPConnection;
import org.jivesoftware.smack.ConnectionConfiguration;
import org.jivesoftware.smack.ConnectionCreationListener;
import org.jivesoftware.smack.ConnectionListener;
import org.jivesoftware.smack.SASLAuthentication;
import org.jivesoftware.smack.SmackConfiguration;
import org.jivesoftware.smack.SmackException;
import org.jivesoftware.smack.SmackException.AlreadyLoggedInException;
import org.jivesoftware.smack.SmackException.NoResponseException;
import org.jivesoftware.smack.SmackException.NotConnectedException;
import org.jivesoftware.smack.SmackException.ConnectionException;
import org.jivesoftware.smack.SmackException.SecurityRequiredException;
import org.jivesoftware.smack.XMPPException.StreamErrorException;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.compression.XMPPInputOutputStream;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smack.packet.Presence;
import org.jivesoftware.smack.parsing.ParsingExceptionCallback;
import org.jivesoftware.smack.parsing.UnparsablePacket;
import org.jivesoftware.smack.sasl.SASLMechanism.Challenge;
import org.jivesoftware.smack.sasl.SASLMechanism.SASLFailure;
import org.jivesoftware.smack.sasl.SASLMechanism.Success;
import org.jivesoftware.smack.util.ArrayBlockingQueueWithShutdown;
import org.jivesoftware.smack.util.PacketParserUtils;
import org.jivesoftware.smack.util.StringUtils;
import org.jivesoftware.smack.util.dns.HostAddress;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;
import javax.net.ssl.KeyManager;
import javax.net.ssl.KeyManagerFactory;
@ -54,7 +64,6 @@ import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import java.lang.reflect.Constructor;
@ -67,6 +76,7 @@ import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.logging.Level;
import java.util.logging.Logger;
@ -84,11 +94,12 @@ public class XMPPTCPConnection extends AbstractXMPPConnection {
/**
* The socket which is used for this connection.
*/
Socket socket;
private Socket socket;
String connectionID = null;
private String connectionID = null;
private String user = null;
private boolean connected = false;
// socketClosed is used concurrent
// by XMPPTCPConnection, PacketReader, PacketWriter
private volatile boolean socketClosed = false;
@ -98,8 +109,8 @@ public class XMPPTCPConnection extends AbstractXMPPConnection {
private ParsingExceptionCallback parsingExceptionCallback = SmackConfiguration.getDefaultParsingExceptionCallback();
PacketWriter packetWriter;
PacketReader packetReader;
private PacketWriter packetWriter;
private PacketReader packetReader;
/**
* Collection of available stream compression methods offered by the server.
@ -193,6 +204,7 @@ public class XMPPTCPConnection extends AbstractXMPPConnection {
config.setCallbackHandler(callbackHandler);
}
@Override
public String getConnectionID() {
if (!isConnected()) {
return null;
@ -200,6 +212,7 @@ public class XMPPTCPConnection extends AbstractXMPPConnection {
return connectionID;
}
@Override
public String getUser() {
if (!isAuthenticated()) {
return null;
@ -335,22 +348,26 @@ public class XMPPTCPConnection extends AbstractXMPPConnection {
callConnectionAuthenticatedListener();
}
@Override
public boolean isConnected() {
return connected;
}
@Override
public boolean isSecureConnection() {
return isUsingTLS();
return usingTLS;
}
public boolean isSocketClosed() {
return socketClosed;
}
@Override
public boolean isAuthenticated() {
return authenticated;
}
@Override
public boolean isAnonymous() {
return anonymous;
}
@ -454,8 +471,8 @@ public class XMPPTCPConnection extends AbstractXMPPConnection {
try {
if (isFirstInitialization) {
packetWriter = new PacketWriter(this);
packetReader = new PacketReader(this);
packetWriter = new PacketWriter();
packetReader = new PacketReader();
// If debugging is enabled, we should start the thread that will listen for
// all packets and then log them.
@ -534,16 +551,6 @@ public class XMPPTCPConnection extends AbstractXMPPConnection {
* TLS code below
**********************************************/
/**
* Returns true if the connection to the server has successfully negotiated TLS. Once TLS
* has been negotiatied the connection has been secured.
*
* @return true if the connection to the server has successfully negotiated TLS.
*/
public boolean isUsingTLS() {
return usingTLS;
}
/**
* Notification message saying that the server supports TLS so confirm the server that we
* want to secure the connection.
@ -551,7 +558,7 @@ public class XMPPTCPConnection extends AbstractXMPPConnection {
* @param required true when the server indicates that TLS is required.
* @throws IOException if an exception occurs.
*/
void startTLSReceived(boolean required) throws IOException {
private void startTLSReceived(boolean required) throws IOException {
if (required && config.getSecurityMode() ==
ConnectionConfiguration.SecurityMode.disabled) {
notifyConnectionError(new IllegalStateException(
@ -574,7 +581,7 @@ public class XMPPTCPConnection extends AbstractXMPPConnection {
*
* @throws Exception if an exception occurs.
*/
void proceedTLSReceived() throws Exception {
private void proceedTLSReceived() throws Exception {
SSLContext context = this.config.getCustomSSLContext();
KeyStore ks = null;
KeyManager[] kms = null;
@ -679,7 +686,7 @@ public class XMPPTCPConnection extends AbstractXMPPConnection {
*
* @param methods compression methods offered by the server.
*/
void setAvailableCompressionMethods(Collection<String> methods) {
private void setAvailableCompressionMethods(Collection<String> methods) {
compressionMethods = methods;
}
@ -700,6 +707,7 @@ public class XMPPTCPConnection extends AbstractXMPPConnection {
return null;
}
@Override
public boolean isUsingCompression() {
return compressionHandler != null && serverAckdCompression;
}
@ -759,7 +767,7 @@ public class XMPPTCPConnection extends AbstractXMPPConnection {
*
* @throws IOException if there is an exception starting stream compression.
*/
void startStreamCompression() throws IOException {
private void startStreamCompression() throws IOException {
serverAckdCompression = true;
// Initialize the reader and writer with the new secured version
initReaderAndWriter();
@ -776,7 +784,7 @@ public class XMPPTCPConnection extends AbstractXMPPConnection {
* Notifies the XMPP connection that stream compression negotiation is done so that the
* connection process can proceed.
*/
void streamCompressionNegotiationDone() {
private void streamCompressionNegotiationDone() {
synchronized (compressionLock) {
compressionLock.notify();
}
@ -824,7 +832,7 @@ public class XMPPTCPConnection extends AbstractXMPPConnection {
*
* @param e the exception that causes the connection close event.
*/
synchronized void notifyConnectionError(Exception e) {
private synchronized void notifyConnectionError(Exception e) {
// Listeners were already notified of the exception, return right here.
if ((packetReader == null || packetReader.done) &&
(packetWriter == null || packetWriter.done)) return;
@ -836,61 +844,6 @@ public class XMPPTCPConnection extends AbstractXMPPConnection {
callConnectionClosedOnErrorListener(e);
}
@Override
protected void processPacket(Packet packet) {
super.processPacket(packet);
}
@Override
protected Reader getReader() {
return super.getReader();
}
@Override
protected Writer getWriter() {
return super.getWriter();
}
@Override
protected void throwConnectionExceptionOrNoResponse() throws IOException, NoResponseException {
super.throwConnectionExceptionOrNoResponse();
}
@Override
protected void setServiceName(String serviceName) {
super.setServiceName(serviceName);
}
@Override
protected void serverRequiresBinding() {
super.serverRequiresBinding();
}
@Override
protected void setServiceCapsNode(String node) {
super.setServiceCapsNode(node);
}
@Override
protected void serverSupportsSession() {
super.serverSupportsSession();
}
@Override
protected void setRosterVersioningSupported() {
super.setRosterVersioningSupported();
}
@Override
protected void serverSupportsAccountCreation() {
super.serverSupportsAccountCreation();
}
@Override
protected SASLAuthentication getSASLAuthentication() {
return super.getSASLAuthentication();
}
/**
* Sends a notification indicating that the connection was reconnected successfully.
*/
@ -907,4 +860,514 @@ public class XMPPTCPConnection extends AbstractXMPPConnection {
}
}
}
protected class PacketReader {
private Thread readerThread;
private XmlPullParser parser;
/**
* Set to true if the last features stanza from the server has been parsed. A XMPP connection
* handshake can invoke multiple features stanzas, e.g. when TLS is activated a second feature
* stanza is send by the server. This is set to true once the last feature stanza has been
* parsed.
*/
private volatile boolean lastFeaturesParsed;
private volatile boolean done;
PacketReader() throws SmackException {
this.init();
}
/**
* Initializes the reader in order to be used. The reader is initialized during the
* first connection and when reconnecting due to an abruptly disconnection.
*
* @throws SmackException if the parser could not be reset.
*/
void init() throws SmackException {
done = false;
lastFeaturesParsed = false;
readerThread = new Thread() {
public void run() {
parsePackets(this);
}
};
readerThread.setName("Smack Packet Reader (" + getConnectionCounter() + ")");
readerThread.setDaemon(true);
resetParser();
}
/**
* Starts the packet reader thread and returns once a connection to the server
* has been established or if the server's features could not be parsed within
* the connection's PacketReplyTimeout.
*
* @throws NoResponseException if the server fails to send an opening stream back
* within packetReplyTimeout.
* @throws IOException
*/
synchronized void startup() throws NoResponseException, IOException {
readerThread.start();
try {
// Wait until either:
// - the servers last features stanza has been parsed
// - an exception is thrown while parsing
// - the timeout occurs
wait(getPacketReplyTimeout());
}
catch (InterruptedException ie) {
// Ignore.
}
if (!lastFeaturesParsed) {
throwConnectionExceptionOrNoResponse();
}
}
/**
* Shuts the packet reader down. This method simply sets the 'done' flag to true.
*/
void shutdown() {
done = true;
}
/**
* Resets the parser using the latest connection's reader. Reseting the parser is necessary
* when the plain connection has been secured or when a new opening stream element is going
* to be sent by the server.
*
* @throws SmackException if the parser could not be reset.
*/
private void resetParser() throws SmackException {
try {
parser = XmlPullParserFactory.newInstance().newPullParser();
parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, true);
parser.setInput(getReader());
}
catch (XmlPullParserException e) {
throw new SmackException(e);
}
}
/**
* Parse top-level packets in order to process them further.
*
* @param thread the thread that is being used by the reader to parse incoming packets.
*/
private void parsePackets(Thread thread) {
try {
int eventType = parser.getEventType();
do {
if (eventType == XmlPullParser.START_TAG) {
int parserDepth = parser.getDepth();
String name = parser.getName();
ParsingExceptionCallback callback = getParsingExceptionCallback();
Packet packet;
try {
packet = PacketParserUtils.parseStanza(parser, XMPPTCPConnection.this);
} catch (Exception e) {
String content = PacketParserUtils.parseContentDepth(parser, parserDepth);
UnparsablePacket message = new UnparsablePacket(content, e);
if (callback != null) {
callback.handleUnparsablePacket(message);
}
continue;
}
if (packet != null) {
processPacket(packet);
}
// We found an opening stream. Record information about it, then notify
// the connectionID lock so that the packet reader startup can finish.
else if (name.equals("stream")) {
// Ensure the correct jabber:client namespace is being used.
if ("jabber:client".equals(parser.getNamespace(null))) {
// Get the connection id.
for (int i=0; i<parser.getAttributeCount(); i++) {
if (parser.getAttributeName(i).equals("id")) {
// Save the connectionID
connectionID = parser.getAttributeValue(i);
}
else if (parser.getAttributeName(i).equals("from")) {
// Use the server name that the server says that it is.
setServiceName(parser.getAttributeValue(i));
}
}
}
}
else if (name.equals("error")) {
throw new StreamErrorException(PacketParserUtils.parseStreamError(parser));
}
else if (name.equals("features")) {
parseFeatures(parser);
}
else if (name.equals("proceed")) {
// Secure the connection by negotiating TLS
proceedTLSReceived();
// Reset the state of the parser since a new stream element is going
// to be sent by the server
resetParser();
}
else if (name.equals("failure")) {
String namespace = parser.getNamespace(null);
if ("urn:ietf:params:xml:ns:xmpp-tls".equals(namespace)) {
// TLS negotiation has failed. The server will close the connection
throw new Exception("TLS negotiation has failed");
}
else if ("http://jabber.org/protocol/compress".equals(namespace)) {
// Stream compression has been denied. This is a recoverable
// situation. It is still possible to authenticate and
// use the connection but using an uncompressed connection
streamCompressionNegotiationDone();
}
else {
// SASL authentication has failed. The server may close the connection
// depending on the number of retries
final SASLFailure failure = PacketParserUtils.parseSASLFailure(parser);
processPacket(failure);
getSASLAuthentication().authenticationFailed(failure);
}
}
else if (name.equals("challenge")) {
// The server is challenging the SASL authentication made by the client
String challengeData = parser.nextText();
processPacket(new Challenge(challengeData));
getSASLAuthentication().challengeReceived(challengeData);
}
else if (name.equals("success")) {
processPacket(new Success(parser.nextText()));
// We now need to bind a resource for the connection
// Open a new stream and wait for the response
packetWriter.openStream();
// Reset the state of the parser since a new stream element is going
// to be sent by the server
resetParser();
// The SASL authentication with the server was successful. The next step
// will be to bind the resource
getSASLAuthentication().authenticated();
}
else if (name.equals("compressed")) {
// Server confirmed that it's possible to use stream compression. Start
// stream compression
startStreamCompression();
// Reset the state of the parser since a new stream element is going
// to be sent by the server
resetParser();
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("stream")) {
// Disconnect the connection
disconnect();
}
}
eventType = parser.next();
} while (!done && eventType != XmlPullParser.END_DOCUMENT && thread == readerThread);
}
catch (Exception e) {
// The exception can be ignored if the the connection is 'done'
// or if the it was caused because the socket got closed
if (!(done || isSocketClosed())) {
synchronized(this) {
this.notify();
}
// Close the connection and notify connection listeners of the
// error.
notifyConnectionError(e);
}
}
}
private void parseFeatures(XmlPullParser parser) throws Exception {
boolean startTLSReceived = false;
boolean startTLSRequired = false;
boolean done = false;
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
if (parser.getName().equals("starttls")) {
startTLSReceived = true;
}
else if (parser.getName().equals("mechanisms")) {
// The server is reporting available SASL mechanisms. Store this information
// which will be used later while logging (i.e. authenticating) into
// the server
getSASLAuthentication().setAvailableSASLMethods(
PacketParserUtils.parseMechanisms(parser));
}
else if (parser.getName().equals("bind")) {
// The server requires the client to bind a resource to the stream
serverRequiresBinding();
}
// Set the entity caps node for the server if one is send
// See http://xmpp.org/extensions/xep-0115.html#stream
else if (parser.getName().equals("c")) {
String node = parser.getAttributeValue(null, "node");
String ver = parser.getAttributeValue(null, "ver");
if (ver != null && node != null) {
String capsNode = node + "#" + ver;
// In order to avoid a dependency from smack to smackx
// we have to set the services caps node in the connection
// and not directly in the EntityCapsManager
setServiceCapsNode(capsNode);
}
}
else if (parser.getName().equals("session")) {
// The server supports sessions
serverSupportsSession();
}
else if (parser.getName().equals("ver")) {
if (parser.getNamespace().equals("urn:xmpp:features:rosterver")) {
setRosterVersioningSupported();
}
}
else if (parser.getName().equals("compression")) {
// The server supports stream compression
setAvailableCompressionMethods(PacketParserUtils.parseCompressionMethods(parser));
}
else if (parser.getName().equals("register")) {
serverSupportsAccountCreation();
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("starttls")) {
// Confirm the server that we want to use TLS
startTLSReceived(startTLSRequired);
}
else if (parser.getName().equals("required") && startTLSReceived) {
startTLSRequired = true;
}
else if (parser.getName().equals("features")) {
done = true;
}
}
}
// If TLS is required but the server doesn't offer it, disconnect
// from the server and throw an error. First check if we've already negotiated TLS
// and are secure, however (features get parsed a second time after TLS is established).
if (!isSecureConnection()) {
if (!startTLSReceived
&& getConfiguration().getSecurityMode() == ConnectionConfiguration.SecurityMode.required)
{
throw new SecurityRequiredException();
}
}
// Release the lock after TLS has been negotiated or we are not interested in TLS. If the
// server announced TLS and we choose to use it, by sending 'starttls', which the server
// replied with 'proceed', the server is required to send a new stream features element that
// "MUST NOT include the STARTTLS feature" (RFC6120 5.4.3.3. 5.). We are therefore save to
// release the connection lock once either TLS is disabled or we received a features stanza
// without starttls.
if (!startTLSReceived
|| getConfiguration().getSecurityMode() == ConnectionConfiguration.SecurityMode.disabled)
{
lastFeaturesParsed = true;
// This synchronized block prevents this thread from calling notify() before the other
// thread had called wait() (it would cause an Exception if wait() hadn't been called)
synchronized (this) {
notify();
}
}
}
}
protected class PacketWriter {
public static final int QUEUE_SIZE = 500;
private final ArrayBlockingQueueWithShutdown<Packet> queue = new ArrayBlockingQueueWithShutdown<Packet>(QUEUE_SIZE, true);
private Thread writerThread;
private Writer writer;
private volatile boolean done;
protected AtomicBoolean shutdownDone = new AtomicBoolean(false);
/**
* Creates a new packet writer with the specified connection.
*/
PacketWriter() {
init();
}
/**
* Initializes the writer in order to be used. It is called at the first connection and also
* is invoked if the connection is disconnected by an error.
*/
void init() {
writer = getWriter();
done = false;
shutdownDone.set(false);
queue.start();
writerThread = new Thread() {
public void run() {
writePackets(this);
}
};
writerThread.setName("Smack Packet Writer (" + getConnectionCounter() + ")");
writerThread.setDaemon(true);
}
/**
* Sends the specified packet to the server.
*
* @param packet the packet to send.
* @throws NotConnectedException
*/
public void sendPacket(Packet packet) throws NotConnectedException {
if (done) {
throw new NotConnectedException();
}
try {
queue.put(packet);
}
catch (InterruptedException ie) {
throw new NotConnectedException();
}
}
/**
* Starts the packet writer thread and opens a connection to the server. The
* packet writer will continue writing packets until {@link #shutdown} or an
* error occurs.
*/
void startup() {
writerThread.start();
}
void setWriter(Writer writer) {
this.writer = writer;
}
/**
* Shuts down the packet writer. Once this method has been called, no further
* packets will be written to the server.
*/
void shutdown() {
done = true;
queue.shutdown();
synchronized(shutdownDone) {
if (!shutdownDone.get()) {
try {
shutdownDone.wait(getPacketReplyTimeout());
}
catch (InterruptedException e) {
LOGGER.log(Level.WARNING, "shutdown", e);
}
}
}
}
/**
* Returns the next available packet from the queue for writing.
*
* @return the next packet for writing.
*/
private Packet nextPacket() {
if (done) {
return null;
}
Packet packet = null;
try {
packet = queue.take();
}
catch (InterruptedException e) {
// Do nothing
}
return packet;
}
private void writePackets(Thread thisThread) {
try {
// Open the stream.
openStream();
// Write out packets from the queue.
while (!done && (writerThread == thisThread)) {
Packet packet = nextPacket();
if (packet != null) {
writer.write(packet.toXML().toString());
if (queue.isEmpty()) {
writer.flush();
}
}
}
// Flush out the rest of the queue. If the queue is extremely large, it's possible
// we won't have time to entirely flush it before the socket is forced closed
// by the shutdown process.
try {
while (!queue.isEmpty()) {
Packet packet = queue.remove();
writer.write(packet.toXML().toString());
}
writer.flush();
}
catch (Exception e) {
LOGGER.log(Level.WARNING, "Exception flushing queue during shutdown, ignore and continue", e);
}
// Delete the queue contents (hopefully nothing is left).
queue.clear();
// Close the stream.
try {
writer.write("</stream:stream>");
writer.flush();
}
catch (Exception e) {
LOGGER.log(Level.WARNING, "Exception writing closing stream element", e);
}
finally {
try {
writer.close();
}
catch (Exception e) {
// Do nothing
}
}
shutdownDone.set(true);
synchronized(shutdownDone) {
shutdownDone.notify();
}
}
catch (IOException ioe) {
// The exception can be ignored if the the connection is 'done'
// or if the it was caused because the socket got closed
if (!(done || isSocketClosed())) {
shutdown();
notifyConnectionError(ioe);
}
}
}
/**
* Sends to the server a new stream element. This operation may be requested several times
* so we need to encapsulate the logic in one place. This message will be sent while doing
* TLS, SASL and resource binding.
*
* @throws IOException If an error occurs while sending the stanza to the server.
*/
void openStream() throws IOException {
StringBuilder stream = new StringBuilder();
stream.append("<stream:stream");
stream.append(" to=\"").append(getServiceName()).append("\"");
stream.append(" xmlns=\"jabber:client\"");
stream.append(" xmlns:stream=\"http://etherx.jabber.org/streams\"");
stream.append(" version=\"1.0\">");
writer.write(stream.toString());
writer.flush();
}
}
}

5
smack-tcp/src/test/java/org/jivesoftware/smack/tcp/PacketWriterTest.java
View file

@ -23,6 +23,7 @@ import java.util.concurrent.CyclicBarrier;
import org.jivesoftware.smack.SmackException.NotConnectedException;
import org.jivesoftware.smack.packet.Message;
import org.jivesoftware.smack.tcp.XMPPTCPConnection.PacketWriter;
import org.junit.Test;
import static org.junit.Assert.fail;
@ -44,11 +45,11 @@ public class PacketWriterTest {
@Test
public void shouldBlockAndUnblockTest() throws InterruptedException, BrokenBarrierException, NotConnectedException {
XMPPTCPConnection connection = new XMPPTCPConnection("foobar.com");
final PacketWriter pw = new PacketWriter(connection);
final PacketWriter pw = connection.new PacketWriter();
pw.setWriter(new BlockingStringWriter());
pw.startup();
for (int i = 0; i < PacketWriter.QUEUE_SIZE; i++) {
for (int i = 0; i < XMPPTCPConnection.PacketWriter.QUEUE_SIZE; i++) {
pw.sendPacket(new Message());
}