Java tutorial
/* ************************************************************************ # # DivConq # # http://divconq.com/ # # Copyright: # Copyright 2014 eTimeline, LLC. All rights reserved. # # License: # See the license.txt file in the project's top-level directory for details. # # Authors: # * Andy White # ************************************************************************ */ package divconq.web; import io.netty.bootstrap.ServerBootstrap; import io.netty.channel.Channel; import io.netty.channel.ChannelFuture; import io.netty.channel.ChannelInitializer; import io.netty.channel.ChannelOption; import io.netty.channel.ChannelPipeline; import io.netty.channel.socket.SocketChannel; import io.netty.channel.socket.nio.NioServerSocketChannel; import io.netty.handler.codec.http.HttpRequestDecoder; import io.netty.handler.codec.http.HttpResponseEncoder; import io.netty.handler.stream.ChunkedWriteHandler; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.locks.ReentrantLock; import divconq.hub.Hub; import divconq.hub.HubEvents; import divconq.log.Logger; import divconq.mod.ModuleBase; import divconq.util.StringUtil; import divconq.web.http.ServerHandler; import divconq.web.http.SniHandler; import divconq.xml.XElement; //TODO integrate streaming - http://code.google.com/p/red5/ public class WebModule extends ModuleBase { protected ConcurrentHashMap<Integer, Channel> activelisteners = new ConcurrentHashMap<>(); protected ReentrantLock listenlock = new ReentrantLock(); protected WebSiteManager siteman = new WebSiteManager(); @Override public void start() { // prepare the web site manager from settings in module config this.siteman.start(this, this.config); // private hub then go online ASAP //if (!Hub.instance.getResources().isGateway()) // this.goOnline(); Hub.instance.subscribeToEvent(HubEvents.Connected, e -> this.goOnline()); Hub.instance.subscribeToEvent(HubEvents.Booted, e -> this.goOffline()); } public void goOnline() { this.listenlock.lock(); try { // don't try if already in online mode if (this.activelisteners.size() > 0) return; // typically we should have an extension, unless we are supporting RPC only // TODO if (WebSiteManager.instance.getDefaultExtension() == null) // log.warn(0, "No default extension for web server"); for (final XElement httpconfig : this.config.selectAll("HttpListener")) { final boolean secure = "True".equals(httpconfig.getAttribute("Secure")); int httpport = (int) StringUtil.parseInt(httpconfig.getAttribute("Port"), secure ? 443 : 80); // ------------------------------------------------- // message port // ------------------------------------------------- ServerBootstrap b = new ServerBootstrap(); // TODO consider using shared EventLoopGroup // http://normanmaurer.me/presentations/2014-facebook-eng-netty/slides.html#25.0 b.group(Hub.instance.getEventLoopGroup()).channel(NioServerSocketChannel.class) .option(ChannelOption.ALLOCATOR, Hub.instance.getBufferAllocator()) //.option(ChannelOption.SO_BACKLOG, 125) // this is probably not needed but serves as note to research .option(ChannelOption.TCP_NODELAY, true) .childHandler(new ChannelInitializer<SocketChannel>() { @Override protected void initChannel(SocketChannel ch) throws Exception { ChannelPipeline pipeline = ch.pipeline(); if (secure) { SniHandler ssl = new SniHandler(WebModule.this.siteman); //SslHandler ssl = new SslHandler(WebModule.this.siteman.findSslContextFactory("root").getServerEngine()); pipeline.addLast("ssl", ssl); } //pipeline.addLast("codec-http", new HttpServerCodec()); //pipeline.addLast("aggregator", new HttpObjectAggregator(65536)); pipeline.addLast("decoder", new HttpRequestDecoder(4096, 8192, 262144)); pipeline.addLast("encoder", new HttpResponseEncoder()); pipeline.addLast("chunkedWriter", new ChunkedWriteHandler()); // TODO maybe - but currently we selectively compress files which is more efficient // this can also be a cached & compressed response that way //pipeline.addLast("deflater", new HttpContentCompressor()); pipeline.addLast("handler", new ServerHandler(httpconfig, WebModule.this.siteman)); } }); try { // must wait here, both to keep the activelisteners listeners up to date // but also to make sure we don't release connectLock too soon ChannelFuture bfuture = b.bind(httpport).sync(); if (bfuture.isSuccess()) { Logger.info("Web Server listening - now listening for HTTP on TCP port " + httpport); this.activelisteners.put(httpport, bfuture.channel()); } else Logger.error("Web Server unable to bind: " + bfuture.cause()); } catch (InterruptedException x) { Logger.error("Web Server interrupted while binding: " + x); } catch (Exception x) { Logger.error("Web Server errored while binding: " + x); } } } finally { this.listenlock.unlock(); } this.siteman.online(); //for (IWebExtension ext : WebSiteManager.instance.extensions.values()) // ext.online(); } public void goOffline() { this.listenlock.lock(); try { // we don't want to listen anymore for (final Integer port : this.activelisteners.keySet()) { // tear down message port Channel ch = this.activelisteners.remove(port); try { // must wait here, both to keep the activelisteners listeners up to date // but also to make sure we don't release connectLock too soon ChannelFuture bfuture = ch.close().sync(); if (bfuture.isSuccess()) Logger.info("Web Server unbound"); else Logger.error("Web Server unable to unbind: " + bfuture.cause()); } catch (InterruptedException x) { Logger.error("Web Server unable to unbind: " + x); } } } finally { this.listenlock.unlock(); } } @Override public void stop() { this.goOffline(); } }