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/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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 io.undertow.websockets.core;
import io.undertow.conduits.IdleTimeoutConduit;
import io.undertow.server.protocol.framed.AbstractFramedChannel;
import io.undertow.server.protocol.framed.AbstractFramedStreamSourceChannel;
import io.undertow.server.protocol.framed.FrameHeaderData;
import io.undertow.websockets.extensions.ExtensionFunction;
import org.xnio.ChannelExceptionHandler;
import org.xnio.ChannelListener;
import org.xnio.ChannelListeners;
import org.xnio.IoUtils;
import org.xnio.OptionMap;
import io.undertow.connector.ByteBufferPool;
import io.undertow.connector.PooledByteBuffer;
import org.xnio.StreamConnection;
import org.xnio.channels.StreamSinkChannel;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
/**
* A {@link org.xnio.channels.ConnectedChannel} which can be used to send and receive WebSocket Frames.
*
* @author Norman Maurer
* @author Stuart Douglas
*/
public abstract class WebSocketChannel extends AbstractFramedChannel {
private final boolean client;
private final WebSocketVersion version;
private final String wsUrl;
private volatile boolean closeFrameReceived;
private volatile boolean closeFrameSent;
/**
* If this is true then the web socket close was initiated by the remote peer
*/
private volatile boolean closeInitiatedByRemotePeer;
private volatile int closeCode = -1;
private volatile String closeReason;
private final String subProtocol;
protected final boolean extensionsSupported;
protected final ExtensionFunction extensionFunction;
protected final boolean hasReservedOpCode;
/**
* an incoming frame that has not been created yet
*/
private volatile PartialFrame partialFrame;
private final Map attributes = Collections.synchronizedMap(new HashMap());
protected StreamSourceFrameChannel fragmentedChannel;
/**
* Represents all web socket channels that are attached to the same endpoint.
*/
private final Set peerConnections;
/**
* Create a new {@link WebSocketChannel}
* 8
*
* @param connectedStreamChannel The {@link org.xnio.channels.ConnectedStreamChannel} over which the WebSocket Frames should get send and received.
* Be aware that it already must be "upgraded".
* @param bufferPool The {@link org.xnio.Pool} which will be used to acquire {@link java.nio.ByteBuffer}'s from.
* @param version The {@link WebSocketVersion} of the {@link WebSocketChannel}
* @param wsUrl The url for which the channel was created.
* @param client
* @param peerConnections The concurrent set that is used to track open connections associtated with an endpoint
*/
protected WebSocketChannel(final StreamConnection connectedStreamChannel, ByteBufferPool bufferPool, WebSocketVersion version, String wsUrl, String subProtocol, final boolean client, boolean extensionsSupported, final ExtensionFunction extensionFunction, Set peerConnections, OptionMap options) {
super(connectedStreamChannel, bufferPool, new WebSocketFramePriority(), null, options);
this.client = client;
this.version = version;
this.wsUrl = wsUrl;
this.extensionsSupported = extensionsSupported;
this.extensionFunction = extensionFunction;
this.hasReservedOpCode = extensionFunction.hasExtensionOpCode();
this.subProtocol = subProtocol;
this.peerConnections = peerConnections;
addCloseTask(new ChannelListener() {
@Override
public void handleEvent(WebSocketChannel channel) {
extensionFunction.dispose();
WebSocketChannel.this.peerConnections.remove(WebSocketChannel.this);
}
});
}
@Override
protected Collection> getReceivers() {
if(fragmentedChannel == null) {
return Collections.emptyList();
}
return Collections.>singleton(fragmentedChannel);
}
@Override
protected IdleTimeoutConduit createIdleTimeoutChannel(final StreamConnection connectedStreamChannel) {
return new IdleTimeoutConduit(connectedStreamChannel) {
@Override
protected void doClose() {
WebSockets.sendClose(CloseMessage.GOING_AWAY, null, WebSocketChannel.this, null);
}
};
}
@Override
protected boolean isLastFrameSent() {
return closeFrameSent;
}
@Override
protected boolean isLastFrameReceived() {
return closeFrameReceived;
}
@Override
protected void markReadsBroken(Throwable cause) {
super.markReadsBroken(cause);
}
@Override
protected void lastDataRead() {
if(!closeFrameReceived && !closeFrameSent) {
//the peer has likely already gone away, but try and send a close frame anyway
//this will likely just result in the write() failing an immediate connection termination
//which is what we want
closeFrameReceived = true; //not strictly true, but the read side is gone
try {
sendClose();
} catch (IOException e) {
IoUtils.safeClose(this);
}
}
}
protected boolean isReadsBroken() {
return super.isReadsBroken();
}
@Override
protected FrameHeaderData parseFrame(ByteBuffer data) throws IOException {
if (partialFrame == null) {
partialFrame = receiveFrame();
}
try {
partialFrame.handle(data);
} catch (WebSocketException e) {
//the data was corrupt
//send a close message
WebSockets.sendClose(new CloseMessage(CloseMessage.WRONG_CODE, e.getMessage()).toByteBuffer(), this, null);
markReadsBroken(e);
if (WebSocketLogger.REQUEST_LOGGER.isDebugEnabled()) {
WebSocketLogger.REQUEST_LOGGER.debugf(e, "receive failed due to Exception");
}
throw new IOException(e);
}
if (partialFrame.isDone()) {
PartialFrame p = this.partialFrame;
this.partialFrame = null;
return p;
}
return null;
}
/**
* Create a new {@link io.undertow.websockets.core.StreamSourceFrameChannel} which can be used to read the data of the received Frame
*
* @return channel A {@link io.undertow.websockets.core.StreamSourceFrameChannel} will be used to read a Frame from.
* This will return {@code null} if the right {@link io.undertow.websockets.core.StreamSourceFrameChannel} could not be detected with the given
* buffer and so more data is needed.
*/
protected abstract PartialFrame receiveFrame();
@Override
protected StreamSourceFrameChannel createChannel(FrameHeaderData frameHeaderData, PooledByteBuffer frameData) {
PartialFrame partialFrame = (PartialFrame) frameHeaderData;
StreamSourceFrameChannel channel = partialFrame.getChannel(frameData);
if (channel.getType() == WebSocketFrameType.CLOSE) {
if(!closeFrameSent) {
closeInitiatedByRemotePeer = true;
}
closeFrameReceived = true;
}
return channel;
}
public final boolean setAttribute(String key, Object value) {
if (value == null) {
return attributes.remove(key) != null;
} else {
return attributes.put(key, value) == null;
}
}
public final Object getAttribute(String key) {
return attributes.get(key);
}
/**
* Returns {@code true} if extensions are supported by this WebSocket Channel.
*/
public boolean areExtensionsSupported() {
return extensionsSupported;
}
@Override
protected void handleBrokenSourceChannel(Throwable e) {
if (e instanceof UnsupportedEncodingException) {
getFramePriority().immediateCloseFrame();
WebSockets.sendClose(new CloseMessage(CloseMessage.MSG_CONTAINS_INVALID_DATA, e.getMessage()).toByteBuffer(), this, null);
} else if (e instanceof WebSocketInvalidCloseCodeException) {
WebSockets.sendClose(new CloseMessage(CloseMessage.WRONG_CODE, e.getMessage()).toByteBuffer(), this, null);
} else if (e instanceof WebSocketFrameCorruptedException) {
getFramePriority().immediateCloseFrame();
WebSockets.sendClose(new CloseMessage(CloseMessage.WRONG_CODE, e.getMessage()).toByteBuffer(), this, null);
}
}
@Override
protected void handleBrokenSinkChannel(Throwable e) {
}
/**
* Returns an unmodifiable {@link Set} of the selected subprotocols if any.
*/
@Deprecated
public Set getSubProtocols() {
return Collections.singleton(subProtocol);
}
public String getSubProtocol() {
return subProtocol;
}
public boolean isCloseFrameReceived() {
return closeFrameReceived;
}
public boolean isCloseFrameSent() {
return closeFrameSent;
}
/**
* Get the request URI scheme. Normally this is one of {@code ws} or {@code wss}.
*
* @return the request URI scheme
*/
public String getRequestScheme() {
if (getUrl().startsWith("wss:")) {
return "wss";
} else {
return "ws";
}
}
/**
* Return {@code true} if this is handled via WebSocket Secure.
*/
public boolean isSecure() {
return "wss".equals(getRequestScheme());
}
/**
* Return the URL of the WebSocket endpoint.
*
* @return url The URL of the endpoint
*/
public String getUrl() {
return wsUrl;
}
/**
* Return the {@link WebSocketVersion} which is used
*
* @return version The {@link WebSocketVersion} which is in use
*/
public WebSocketVersion getVersion() {
return version;
}
/**
* Get the source address of the WebSocket Channel.
*
* @return the source address of the WebSocket Channel
*/
public InetSocketAddress getSourceAddress() {
return getPeerAddress(InetSocketAddress.class);
}
/**
* Get the destination address of the WebSocket Channel.
*
* @return the destination address of the WebSocket Channel
*/
public InetSocketAddress getDestinationAddress() {
return getLocalAddress(InetSocketAddress.class);
}
public boolean isClient() {
return client;
}
/**
* Returns a new {@link StreamSinkFrameChannel} for sending the given {@link WebSocketFrameType} with the given payload.
* If this method is called multiple times, subsequent {@link StreamSinkFrameChannel}'s will not be writable until all previous frames
* were completely written.
*
* @param type The {@link WebSocketFrameType} for which a {@link StreamSinkChannel} should be created
*/
public final StreamSinkFrameChannel send(WebSocketFrameType type) throws IOException {
if(closeFrameSent || (closeFrameReceived && type != WebSocketFrameType.CLOSE)) {
throw WebSocketMessages.MESSAGES.channelClosed();
}
if (isWritesBroken()) {
throw WebSocketMessages.MESSAGES.streamIsBroken();
}
StreamSinkFrameChannel ch = createStreamSinkChannel(type);
getFramePriority().addToOrderQueue(ch);
if (type == WebSocketFrameType.CLOSE) {
closeFrameSent = true;
}
return ch;
}
/**
* Send a Close frame without a payload
*/
public void sendClose() throws IOException {
closeReason = "";
closeCode = CloseMessage.NORMAL_CLOSURE;
StreamSinkFrameChannel closeChannel = send(WebSocketFrameType.CLOSE);
closeChannel.shutdownWrites();
if (!closeChannel.flush()) {
closeChannel.getWriteSetter().set(ChannelListeners.flushingChannelListener(
null, new ChannelExceptionHandler() {
@Override
public void handleException(final StreamSinkChannel channel, final IOException exception) {
IoUtils.safeClose(WebSocketChannel.this);
}
}
));
closeChannel.resumeWrites();
}
}
/**
* Create a new StreamSinkFrameChannel which can be used to send a WebSocket Frame of the type {@link WebSocketFrameType}.
*
* @param type The {@link WebSocketFrameType} of the WebSocketFrame which will be send over this {@link StreamSinkFrameChannel}
*/
protected abstract StreamSinkFrameChannel createStreamSinkChannel(WebSocketFrameType type);
protected WebSocketFramePriority getFramePriority() {
return (WebSocketFramePriority) super.getFramePriority();
}
/**
* Returns all 'peer' web socket connections that were created from the same endpoint.
*
*
* @return all 'peer' web socket connections
*/
public Set getPeerConnections() {
return Collections.unmodifiableSet(peerConnections);
}
/**
* If this is true the session is being closed because the remote peer sent a close frame
* @return true if the remote peer closed the connection
*/
public boolean isCloseInitiatedByRemotePeer() {
return closeInitiatedByRemotePeer;
}
/**
* Interface that represents a frame channel that is in the process of being created
*/
public interface PartialFrame extends FrameHeaderData {
/**
* @return The channel, or null if the channel is not available yet
*/
StreamSourceFrameChannel getChannel(final PooledByteBuffer data);
/**
* Handles the data, any remaining data will be pushed back
*/
void handle(ByteBuffer data) throws WebSocketException;
/**
* @return true if the channel is available
*/
boolean isDone();
}
/**
*
* @return The close reason
*/
public String getCloseReason() {
return closeReason;
}
public void setCloseReason(String closeReason) {
this.closeReason = closeReason;
}
/**
*
* @return The close code
*/
public int getCloseCode() {
return closeCode;
}
public void setCloseCode(int closeCode) {
this.closeCode = closeCode;
}
public ExtensionFunction getExtensionFunction() {
return extensionFunction;
}
}
