Java tutorial
package com.ociweb.pronghorn.adapter.netty.impl; /* * Copyright 2012 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. */ import static io.netty.handler.codec.http.HttpMethod.GET; import static io.netty.handler.codec.http.HttpResponseStatus.BAD_REQUEST; import static io.netty.handler.codec.http.HttpResponseStatus.FORBIDDEN; import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1; import java.io.File; import java.io.IOException; import java.text.ParseException; import com.ociweb.pronghorn.adapter.netty.WebSocketServerStage; import io.netty.buffer.ByteBuf; import io.netty.buffer.Unpooled; import io.netty.channel.ChannelFuture; import io.netty.channel.ChannelFutureListener; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.SimpleChannelInboundHandler; import io.netty.handler.codec.http.DefaultFullHttpResponse; import io.netty.handler.codec.http.FullHttpRequest; import io.netty.handler.codec.http.FullHttpResponse; import io.netty.handler.codec.http.HttpHeaderNames; import io.netty.handler.codec.http.HttpUtil; import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame; import io.netty.handler.codec.http.websocketx.PingWebSocketFrame; import io.netty.handler.codec.http.websocketx.PongWebSocketFrame; import io.netty.handler.codec.http.websocketx.TextWebSocketFrame; import io.netty.handler.codec.http.websocketx.WebSocketFrame; import io.netty.handler.codec.http.websocketx.WebSocketServerHandshaker; import io.netty.handler.codec.http.websocketx.WebSocketServerHandshakerFactory; import io.netty.util.CharsetUtil; import io.netty.util.concurrent.GenericFutureListener; import io.netty.util.internal.SystemPropertyUtil; /** * Handles handshakes and messages */ public class WebSocketServerHandler extends SimpleChannelInboundHandler<Object> { private static final String WEBSOCKET_PATH = "/websocket"; private WebSocketServerHandshaker handshaker; @Override public void channelRead0(ChannelHandlerContext ctx, Object msg) { if (msg instanceof FullHttpRequest) { handleHttpRequest(ctx, (FullHttpRequest) msg); } else if (msg instanceof WebSocketFrame) { handleWebSocketFrame(ctx, (WebSocketFrame) msg); } } @Override public void channelReadComplete(ChannelHandlerContext ctx) { ctx.flush(); } private void handleHttpRequest(ChannelHandlerContext ctx, FullHttpRequest req) { // Handle a bad request. if (!req.decoderResult().isSuccess()) { sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, BAD_REQUEST)); return; } // Allow only GET methods. if (req.method() != GET) { sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, FORBIDDEN)); return; } String path = HttpStaticFileServerHandler.sanitizeUri(req.uri(), SystemPropertyUtil.get("user.dir")); System.out.println("path:" + path); if (null != path) { File file = new File(path); if (file.exists() && !file.isHidden()) { try { HttpStaticFileServerHandler.sendFile(ctx, req, file); } catch (ParseException e) { throw new RuntimeException(e); } catch (IOException e) { throw new RuntimeException(e); } return; } } // Handshake WebSocketServerHandshakerFactory wsFactory = new WebSocketServerHandshakerFactory(getWebSocketLocation(req), null, true); handshaker = wsFactory.newHandshaker(req); if (handshaker == null) { WebSocketServerHandshakerFactory.sendUnsupportedVersionResponse(ctx.channel()); } else { GenericFutureListener<ChannelFuture> webSocketIsOpen = new GenericFutureListener<ChannelFuture>() { @Override public void operationComplete(ChannelFuture future) throws Exception { System.out.println("UpgradedWebSocket for id " + future.channel().id().asShortText() + " ||| " + future.channel().id().asLongText() + " thread " + Thread.currentThread().getId()); } }; handshaker.handshake(ctx.channel(), req).addListener(webSocketIsOpen); } } private void handleWebSocketFrame(ChannelHandlerContext ctx, WebSocketFrame frame) { // Check for closing frame if (frame instanceof CloseWebSocketFrame) { handshaker.close(ctx.channel(), (CloseWebSocketFrame) frame.retain()); return; } if (frame instanceof PingWebSocketFrame) { ctx.channel().write(new PongWebSocketFrame(frame.content().retain())); return; } if (!(frame instanceof TextWebSocketFrame)) { throw new UnsupportedOperationException( String.format("%s frame types not supported", frame.getClass().getName())); } // Send the uppercase string back. TextWebSocketFrame frame2 = (TextWebSocketFrame) frame; String request = frame2.text(); Thread t = Thread.currentThread(); System.err.printf("%s received %s%n thread %d ", ctx.channel(), request, t.getId()); /////////////////// //Do your work here /////////////////// ctx.channel().write(new TextWebSocketFrame(request.toUpperCase())); } private static void sendHttpResponse(ChannelHandlerContext ctx, FullHttpRequest req, FullHttpResponse res) { // Generate an error page if response getStatus code is not OK (200). if (res.status().code() != 200) { ByteBuf buf = Unpooled.copiedBuffer(res.status().toString(), CharsetUtil.UTF_8); res.content().writeBytes(buf); buf.release(); HttpUtil.setContentLength(res, res.content().readableBytes()); } // Send the response and close the connection if necessary. ChannelFuture f = ctx.channel().writeAndFlush(res); if (!HttpUtil.isKeepAlive(req) || res.status().code() != 200) { f.addListener(ChannelFutureListener.CLOSE); } } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) { cause.printStackTrace(); ctx.close(); } private static String getWebSocketLocation(FullHttpRequest req) { String location = req.headers().get(HttpHeaderNames.HOST) + WEBSOCKET_PATH; if (WebSocketServerStage.SSL) { return "wss://" + location; } else { return "ws://" + location; } } }