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WebSocketClientProtocolHandshakeHandler.java
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WebSocketClientProtocolHandshakeHandler.java
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/*
* Copyright 2013 The Netty Project
*
* The Netty Project licenses this file to you 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:
*
* https://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.netty.handler.codec.http.websocketx;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.websocketx.WebSocketClientProtocolHandler.ClientHandshakeStateEvent;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.Promise;
import java.util.concurrent.TimeUnit;
import static io.netty.util.internal.ObjectUtil.checkPositive;
class WebSocketClientProtocolHandshakeHandler implements ChannelHandler {
private static final long DEFAULT_HANDSHAKE_TIMEOUT_MS = 10000L;
private final WebSocketClientHandshaker handshaker;
private final long handshakeTimeoutMillis;
private ChannelHandlerContext ctx;
private Promise<Void> handshakePromise;
WebSocketClientProtocolHandshakeHandler(WebSocketClientHandshaker handshaker) {
this(handshaker, DEFAULT_HANDSHAKE_TIMEOUT_MS);
}
WebSocketClientProtocolHandshakeHandler(WebSocketClientHandshaker handshaker, long handshakeTimeoutMillis) {
this.handshaker = handshaker;
this.handshakeTimeoutMillis = checkPositive(handshakeTimeoutMillis, "handshakeTimeoutMillis");
}
@Override
public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
this.ctx = ctx;
handshakePromise = ctx.newPromise();
}
@Override
public void channelActive(final ChannelHandlerContext ctx) throws Exception {
ctx.fireChannelActive();
handshaker.handshake(ctx.channel()).addListener(future -> {
if (future.isFailed()) {
handshakePromise.tryFailure(future.cause());
ctx.fireExceptionCaught(future.cause());
} else {
ctx.fireUserEventTriggered(
WebSocketClientProtocolHandler.ClientHandshakeStateEvent.HANDSHAKE_ISSUED);
}
});
applyHandshakeTimeout();
}
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
if (!handshakePromise.isDone()) {
handshakePromise.tryFailure(new WebSocketClientHandshakeException("channel closed with handshake " +
"in progress"));
}
ctx.fireChannelInactive();
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
if (!(msg instanceof FullHttpResponse)) {
ctx.fireChannelRead(msg);
return;
}
FullHttpResponse response = (FullHttpResponse) msg;
try {
if (!handshaker.isHandshakeComplete()) {
handshaker.finishHandshake(ctx.channel(), response);
handshakePromise.trySuccess(null);
ctx.fireUserEventTriggered(
WebSocketClientProtocolHandler.ClientHandshakeStateEvent.HANDSHAKE_COMPLETE);
ctx.pipeline().remove(this);
return;
}
throw new IllegalStateException("WebSocketClientHandshaker should have been non finished yet");
} finally {
response.release();
}
}
private void applyHandshakeTimeout() {
final Promise<Void> localHandshakePromise = handshakePromise;
if (handshakeTimeoutMillis <= 0 || localHandshakePromise.isDone()) {
return;
}
final Future<?> timeoutFuture = ctx.executor().schedule(() -> {
if (localHandshakePromise.isDone()) {
return;
}
if (localHandshakePromise.tryFailure(new WebSocketClientHandshakeException("handshake timed out"))) {
ctx.flush()
.fireUserEventTriggered(ClientHandshakeStateEvent.HANDSHAKE_TIMEOUT)
.close();
}
}, handshakeTimeoutMillis, TimeUnit.MILLISECONDS);
// Cancel the handshake timeout when handshake is finished.
localHandshakePromise.asFuture().addListener(f -> timeoutFuture.cancel());
}
/**
* This method is visible for testing.
*
* @return current handshake future
*/
Future<Void> getHandshakeFuture() {
return handshakePromise.asFuture();
}
}