/*
* Copyright 2014 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:
*
* 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.netty.example.http.websocketx.client;
import io.netty.bootstrap.
Bootstrap;
import io.netty.buffer.
Unpooled;
import io.netty.channel.
Channel;
import io.netty.channel.
ChannelInitializer;
import io.netty.channel.
ChannelPipeline;
import io.netty.channel.
EventLoopGroup;
import io.netty.channel.nio.
NioEventLoopGroup;
import io.netty.channel.socket.
SocketChannel;
import io.netty.channel.socket.nio.
NioSocketChannel;
import io.netty.handler.codec.http.
DefaultHttpHeaders;
import io.netty.handler.codec.http.
HttpClientCodec;
import io.netty.handler.codec.http.
HttpObjectAggregator;
import io.netty.handler.codec.http.websocketx.
CloseWebSocketFrame;
import io.netty.handler.codec.http.websocketx.
PingWebSocketFrame;
import io.netty.handler.codec.http.websocketx.
TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.
WebSocketClientHandshakerFactory;
import io.netty.handler.codec.http.websocketx.
WebSocketFrame;
import io.netty.handler.codec.http.websocketx.
WebSocketVersion;
import io.netty.handler.codec.http.websocketx.extensions.compression.
WebSocketClientCompressionHandler;
import io.netty.handler.ssl.
SslContext;
import io.netty.handler.ssl.
SslContextBuilder;
import io.netty.handler.ssl.util.
InsecureTrustManagerFactory;
import java.io.
BufferedReader;
import java.io.
InputStreamReader;
import java.net.
URI;
/**
* This is an example of a WebSocket client.
* <p>
* In order to run this example you need a compatible WebSocket server.
* Therefore you can either start the WebSocket server from the examples
* by running {@link io.netty.example.http.websocketx.server.WebSocketServer}
* or connect to an existing WebSocket server such as
* <a href="http://www.websocket.org/echo.html">ws://echo.websocket.org</a>.
* <p>
* The client will attempt to connect to the URI passed to it as the first argument.
* You don't have to specify any arguments if you want to connect to the example WebSocket server,
* as this is the default.
*/
public final class
WebSocketClient {
static final
String URL =
System.
getProperty("url", "ws://127.0.0.1:8080/websocket");
public static void
main(
String[]
args) throws
Exception {
URI uri = new
URI(
URL);
String scheme =
uri.
getScheme() == null? "ws" :
uri.
getScheme();
final
String host =
uri.
getHost() == null? "127.0.0.1" :
uri.
getHost();
final int
port;
if (
uri.
getPort() == -1) {
if ("ws".
equalsIgnoreCase(
scheme)) {
port = 80;
} else if ("wss".
equalsIgnoreCase(
scheme)) {
port = 443;
} else {
port = -1;
}
} else {
port =
uri.
getPort();
}
if (!"ws".
equalsIgnoreCase(
scheme) && !"wss".
equalsIgnoreCase(
scheme)) {
System.
err.
println("Only WS(S) is supported.");
return;
}
final boolean
ssl = "wss".
equalsIgnoreCase(
scheme);
final
SslContext sslCtx;
if (
ssl) {
sslCtx =
SslContextBuilder.
forClient()
.
trustManager(
InsecureTrustManagerFactory.
INSTANCE).
build();
} else {
sslCtx = null;
}
EventLoopGroup group = new
NioEventLoopGroup();
try {
// Connect with V13 (RFC 6455 aka HyBi-17). You can change it to V08 or V00.
// If you change it to V00, ping is not supported and remember to change
// HttpResponseDecoder to WebSocketHttpResponseDecoder in the pipeline.
final
WebSocketClientHandler handler =
new
WebSocketClientHandler(
WebSocketClientHandshakerFactory.
newHandshaker(
uri,
WebSocketVersion.
V13, null, true, new
DefaultHttpHeaders()));
Bootstrap b = new
Bootstrap();
b.
group(
group)
.
channel(
NioSocketChannel.class)
.
handler(new
ChannelInitializer<
SocketChannel>() {
@
Override
protected void
initChannel(
SocketChannel ch) {
ChannelPipeline p =
ch.
pipeline();
if (
sslCtx != null) {
p.
addLast(
sslCtx.
newHandler(
ch.
alloc(),
host,
port));
}
p.
addLast(
new
HttpClientCodec(),
new
HttpObjectAggregator(8192),
WebSocketClientCompressionHandler.
INSTANCE,
handler);
}
});
Channel ch =
b.
connect(
uri.
getHost(),
port).
sync().
channel();
handler.
handshakeFuture().
sync();
BufferedReader console = new
BufferedReader(new
InputStreamReader(
System.
in));
while (true) {
String msg =
console.
readLine();
if (
msg == null) {
break;
} else if ("bye".
equals(
msg.
toLowerCase())) {
ch.
writeAndFlush(new
CloseWebSocketFrame());
ch.
closeFuture().
sync();
break;
} else if ("ping".
equals(
msg.
toLowerCase())) {
WebSocketFrame frame = new
PingWebSocketFrame(
Unpooled.
wrappedBuffer(new byte[] { 8, 1, 8, 1 }));
ch.
writeAndFlush(
frame);
} else {
WebSocketFrame frame = new
TextWebSocketFrame(
msg);
ch.
writeAndFlush(
frame);
}
}
} finally {
group.
shutdownGracefully();
}
}
}