b57d9f307f
- write() now accepts a ChannelPromise and returns ChannelFuture as most users expected. It makes the user's life much easier because it is now much easier to get notified when a specific message has been written. - flush() does not create a ChannelPromise nor returns ChannelFuture. It is now similar to what read() looks like.
143 lines
5.8 KiB
Java
143 lines
5.8 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.example.http.websocketx.autobahn;
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import io.netty.buffer.Unpooled;
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import io.netty.channel.ChannelFuture;
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import io.netty.channel.ChannelFutureListener;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.ChannelInboundHandlerAdapter;
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import io.netty.handler.codec.http.DefaultFullHttpResponse;
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import io.netty.handler.codec.http.FullHttpRequest;
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import io.netty.handler.codec.http.FullHttpResponse;
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import io.netty.handler.codec.http.HttpHeaders;
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import io.netty.handler.codec.http.websocketx.BinaryWebSocketFrame;
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import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame;
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import io.netty.handler.codec.http.websocketx.ContinuationWebSocketFrame;
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import io.netty.handler.codec.http.websocketx.PingWebSocketFrame;
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import io.netty.handler.codec.http.websocketx.PongWebSocketFrame;
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import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
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import io.netty.handler.codec.http.websocketx.WebSocketFrame;
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import io.netty.handler.codec.http.websocketx.WebSocketServerHandshaker;
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import io.netty.handler.codec.http.websocketx.WebSocketServerHandshakerFactory;
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import io.netty.util.CharsetUtil;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import static io.netty.handler.codec.http.HttpHeaders.*;
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import static io.netty.handler.codec.http.HttpMethod.*;
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import static io.netty.handler.codec.http.HttpResponseStatus.*;
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import static io.netty.handler.codec.http.HttpVersion.*;
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/**
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* Handles handshakes and messages
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*/
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public class AutobahnServerHandler extends ChannelInboundHandlerAdapter {
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private static final Logger logger = Logger.getLogger(AutobahnServerHandler.class.getName());
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private WebSocketServerHandshaker handshaker;
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@Override
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public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
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if (msg instanceof FullHttpRequest) {
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handleHttpRequest(ctx, (FullHttpRequest) msg);
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} else if (msg instanceof WebSocketFrame) {
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handleWebSocketFrame(ctx, (WebSocketFrame) msg);
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}
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}
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@Override
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public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
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ctx.flush();
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}
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private void handleHttpRequest(ChannelHandlerContext ctx, FullHttpRequest req)
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throws Exception {
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// Handle a bad request.
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if (!req.getDecoderResult().isSuccess()) {
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sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, BAD_REQUEST));
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return;
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}
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// Allow only GET methods.
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if (req.getMethod() != GET) {
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sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, FORBIDDEN));
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return;
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}
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// Handshake
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WebSocketServerHandshakerFactory wsFactory = new WebSocketServerHandshakerFactory(
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getWebSocketLocation(req), null, false, Integer.MAX_VALUE);
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handshaker = wsFactory.newHandshaker(req);
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if (handshaker == null) {
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WebSocketServerHandshakerFactory.sendUnsupportedWebSocketVersionResponse(ctx.channel());
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} else {
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handshaker.handshake(ctx.channel(), req);
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}
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}
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private void handleWebSocketFrame(ChannelHandlerContext ctx, WebSocketFrame frame) {
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if (logger.isLoggable(Level.FINE)) {
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logger.fine(String.format(
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"Channel %s received %s", ctx.channel().hashCode(), frame.getClass().getSimpleName()));
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}
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if (frame instanceof CloseWebSocketFrame) {
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handshaker.close(ctx.channel(), (CloseWebSocketFrame) frame);
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} else if (frame instanceof PingWebSocketFrame) {
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ctx.write(new PongWebSocketFrame(frame.isFinalFragment(), frame.rsv(), frame.content()));
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} else if (frame instanceof TextWebSocketFrame) {
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ctx.write(frame);
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} else if (frame instanceof BinaryWebSocketFrame) {
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ctx.write(frame);
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} else if (frame instanceof ContinuationWebSocketFrame) {
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ctx.write(frame);
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} else if (frame instanceof PongWebSocketFrame) {
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frame.release();
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// Ignore
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} else {
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throw new UnsupportedOperationException(String.format("%s frame types not supported", frame.getClass()
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.getName()));
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}
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}
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private static void sendHttpResponse(
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ChannelHandlerContext ctx, FullHttpRequest req, FullHttpResponse res) {
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// Generate an error page if response getStatus code is not OK (200).
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if (res.getStatus().code() != 200) {
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res.content().writeBytes(Unpooled.copiedBuffer(res.getStatus().toString(), CharsetUtil.UTF_8));
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setContentLength(res, res.content().readableBytes());
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}
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// Send the response and close the connection if necessary.
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ChannelFuture f = ctx.channel().writeAndFlush(res);
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if (!isKeepAlive(req) || res.getStatus().code() != 200) {
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f.addListener(ChannelFutureListener.CLOSE);
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}
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
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cause.printStackTrace();
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ctx.close();
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}
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private static String getWebSocketLocation(FullHttpRequest req) {
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return "ws://" + req.headers().get(HttpHeaders.Names.HOST);
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}
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}
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