Java tutorial
/** * Copyright 2012 Ronen Hamias, Anton Kharenko * * Licensed 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.scalecube.socketio.pipeline; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.net.SocketAddress; import java.util.List; import io.netty.channel.ChannelHandler; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.ChannelInboundHandlerAdapter; import io.netty.handler.codec.http.FullHttpRequest; import io.netty.handler.codec.http.HttpMethod; import io.netty.handler.codec.http.QueryStringDecoder; import io.netty.util.ReferenceCountUtil; import io.scalecube.socketio.TransportType; import io.scalecube.socketio.packets.ConnectPacket; import io.scalecube.socketio.packets.Packet; import io.scalecube.socketio.serialization.PacketFramer; @ChannelHandler.Sharable public class XHRPollingHandler extends ChannelInboundHandlerAdapter { private final Logger log = LoggerFactory.getLogger(getClass()); private final String connectPath; private final String remoteAddressHeader; public XHRPollingHandler(final String handshakePath, final String remoteAddressHeader) { this.connectPath = handshakePath + TransportType.XHR_POLLING.getName(); this.remoteAddressHeader = remoteAddressHeader; } @Override public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { // ? if (msg instanceof FullHttpRequest) { final FullHttpRequest req = (FullHttpRequest) msg; final HttpMethod requestMethod = req.getMethod(); final QueryStringDecoder queryDecoder = new QueryStringDecoder(req.getUri()); final String requestPath = queryDecoder.path(); if (requestPath.startsWith(connectPath)) { if (log.isDebugEnabled()) log.debug("Received HTTP XHR-Polling request: {} {} from channel: {}", requestMethod, requestPath, ctx.channel()); final String sessionId = PipelineUtils.getSessionId(requestPath); final String origin = PipelineUtils.getOrigin(req); if (HttpMethod.GET.equals(requestMethod)) { SocketAddress clientIp = PipelineUtils.getHeaderClientIPParamValue(req, remoteAddressHeader); // Process polling request from client final ConnectPacket packet = new ConnectPacket(sessionId, origin); packet.setTransportType(TransportType.XHR_POLLING); packet.setRemoteAddress(clientIp); ctx.fireChannelRead(packet); } else if (HttpMethod.POST.equals(requestMethod)) { // Process message request from client List<Packet> packets = PacketFramer.decodePacketsFrame(req.content()); for (Packet packet : packets) { packet.setSessionId(sessionId); packet.setOrigin(origin); ctx.fireChannelRead(packet); } } else { log.warn("Can't process HTTP XHR-Polling request. Unknown request method: {} from channel: {}", requestMethod, ctx.channel()); } ReferenceCountUtil.release(msg); return; } } ctx.fireChannelRead(msg); } }