173 lines
6.9 KiB
Java
173 lines
6.9 KiB
Java
/*
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* Copyright 2014 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.benchmarkserver;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.Unpooled;
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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.SimpleChannelInboundHandler;
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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.HttpHeaderNames;
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import io.netty.handler.codec.http.HttpUtil;
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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.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 static io.netty.handler.codec.http.HttpHeaderNames.CONNECTION;
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import static io.netty.handler.codec.http.HttpHeaderValues.CLOSE;
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import static io.netty.handler.codec.http.HttpHeaderValues.KEEP_ALIVE;
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import static io.netty.handler.codec.http.HttpMethod.GET;
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import static io.netty.handler.codec.http.HttpResponseStatus.BAD_REQUEST;
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import static io.netty.handler.codec.http.HttpResponseStatus.FORBIDDEN;
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import static io.netty.handler.codec.http.HttpResponseStatus.OK;
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import static io.netty.handler.codec.http.HttpResponseStatus.NOT_FOUND;
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import static io.netty.handler.codec.http.HttpVersion.HTTP_1_0;
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import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
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/**
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* Handles handshakes and messages
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*/
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public class WebSocketServerHandler extends SimpleChannelInboundHandler<Object> {
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private static final String WEBSOCKET_PATH = "/websocket";
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private WebSocketServerHandshaker handshaker;
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@Override
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public void messageReceived(ChannelHandlerContext ctx, Object msg) {
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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) {
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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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// Handle a bad request.
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if (!req.decoderResult().isSuccess()) {
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sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, BAD_REQUEST, Unpooled.EMPTY_BUFFER));
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return;
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}
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// Allow only GET methods.
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if (!GET.equals(req.method())) {
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sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, FORBIDDEN, Unpooled.EMPTY_BUFFER));
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return;
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}
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// Send the demo page and favicon.ico
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if ("/".equals(req.uri())) {
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ByteBuf content = WebSocketServerBenchmarkPage.getContent(getWebSocketLocation(req));
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FullHttpResponse res = new DefaultFullHttpResponse(HTTP_1_1, OK, content);
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res.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/html; charset=UTF-8");
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HttpUtil.setContentLength(res, content.readableBytes());
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sendHttpResponse(ctx, req, res);
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return;
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}
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if ("/favicon.ico".equals(req.uri())) {
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FullHttpResponse res = new DefaultFullHttpResponse(HTTP_1_1, NOT_FOUND, Unpooled.EMPTY_BUFFER);
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sendHttpResponse(ctx, req, res);
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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, true, 5 * 1024 * 1024);
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handshaker = wsFactory.newHandshaker(req);
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if (handshaker == null) {
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WebSocketServerHandshakerFactory.sendUnsupportedVersionResponse(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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// Check for closing frame
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if (frame instanceof CloseWebSocketFrame) {
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handshaker.close(ctx.channel(), (CloseWebSocketFrame) frame.retain());
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return;
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}
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if (frame instanceof PingWebSocketFrame) {
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ctx.write(new PongWebSocketFrame(frame.content().retain()));
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return;
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}
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if (frame instanceof TextWebSocketFrame) {
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// Echo the frame
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ctx.write(frame.retain());
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return;
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}
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if (frame instanceof BinaryWebSocketFrame) {
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// Echo the frame
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ctx.write(frame.retain());
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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.status().code() != 200) {
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ByteBuf buf = Unpooled.copiedBuffer(res.status().toString(), CharsetUtil.UTF_8);
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res.content().writeBytes(buf);
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buf.release();
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HttpUtil.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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if (!HttpUtil.isKeepAlive(req) || res.status().code() != 200) {
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// Tell the client we're going to close the connection.
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res.headers().set(CONNECTION, CLOSE);
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ctx.writeAndFlush(res).addListener(ChannelFutureListener.CLOSE);
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} else {
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if (req.protocolVersion().equals(HTTP_1_0)) {
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res.headers().set(CONNECTION, KEEP_ALIVE);
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}
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ctx.writeAndFlush(res);
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}
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
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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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String location = req.headers().get(HttpHeaderNames.HOST) + WEBSOCKET_PATH;
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if (WebSocketServer.SSL) {
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return "wss://" + location;
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} else {
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return "ws://" + location;
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}
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}
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}
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