fabric-discovery-plugin/provider/src/main/java/org/onap/ccsdk/sli/plugins/fabricdiscovery/WebSocketClient.java

   1 /*
   2  * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.onap.ccsdk.sli.plugins.fabricdiscovery;
   9
  10 import io.netty.bootstrap.Bootstrap;
  11 import io.netty.buffer.Unpooled;
  12 import io.netty.channel.Channel;
  13 import io.netty.channel.ChannelInitializer;
  14 import io.netty.channel.ChannelPipeline;
  15 import io.netty.channel.EventLoopGroup;
  16 import io.netty.channel.nio.NioEventLoopGroup;
  17 import io.netty.channel.socket.SocketChannel;
  18 import io.netty.channel.socket.nio.NioSocketChannel;
  19 import io.netty.handler.codec.http.HttpClientCodec;
  20 import io.netty.handler.codec.http.HttpObjectAggregator;
  21 import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame;
  22 import io.netty.handler.codec.http.websocketx.PingWebSocketFrame;
  23 import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
  24 import io.netty.handler.codec.http.websocketx.WebSocketClientHandshakerFactory;
  25 import io.netty.handler.codec.http.websocketx.WebSocketVersion;
  26 import java.net.URI;
  27 import org.slf4j.Logger;
  28 import org.slf4j.LoggerFactory;
  29
  30 public class WebSocketClient {
  31
  32     private static final Logger LOG = LoggerFactory.getLogger(WebSocketClient.class);
  33
  34     private final URI uri;
  35     private final Bootstrap bootstrap = new Bootstrap();
  36     private final WebSocketClientHandler clientHandler;
  37     private Channel clientChannel;
  38     private final EventLoopGroup group = new NioEventLoopGroup();
  39
  40     public WebSocketClient(final URI uri, final IClientMessageCallback clientMessageCallback) {
  41         this.uri = uri;
  42         clientHandler = new WebSocketClientHandler(WebSocketClientHandshakerFactory.newHandshaker(uri,
  43                 WebSocketVersion.V13, null, false, null), clientMessageCallback);
  44         // last null could be replaced with DefaultHttpHeaders
  45         initialize();
  46     }
  47
  48     public void initialize() {
  49
  50         String protocol = uri.getScheme();
  51         if (!"ws".equals(protocol)) {
  52             throw new IllegalArgumentException("Unsupported protocol: " + protocol);
  53         }
  54
  55         bootstrap.group(group).channel(NioSocketChannel.class).handler(new ChannelInitializer<SocketChannel>() {
  56             @Override
  57             public void initChannel(final SocketChannel ch) throws Exception {
  58                 ChannelPipeline pipeline = ch.pipeline();
  59                 pipeline.addLast("http-codec", new HttpClientCodec());
  60                 pipeline.addLast("aggregator", new HttpObjectAggregator(8192));
  61                 pipeline.addLast("ws-handler", clientHandler);
  62             }
  63         });
  64     }
  65
  66     public void connect() throws InterruptedException {
  67         LOG.info("WebSocket Client connecting");
  68         clientChannel = bootstrap.connect(uri.getHost(), uri.getPort()).sync().channel();
  69         clientHandler.handshakeFuture().sync();
  70     }
  71
  72     public void writeAndFlush(final String message) {
  73         clientChannel.writeAndFlush(new TextWebSocketFrame(message));
  74     }
  75
  76     public void writeAndFlush(final Object message) {
  77         clientChannel.writeAndFlush(message);
  78     }
  79
  80     public void ping() {
  81         clientChannel.writeAndFlush(new PingWebSocketFrame(Unpooled.copiedBuffer(new byte[] { 1, 2, 3, 4, 5, 6 })));
  82     }
  83
  84     public void close(final String reasonText) throws InterruptedException {
  85         CloseWebSocketFrame closeWebSocketFrame = new CloseWebSocketFrame(1000, reasonText);
  86         clientChannel.writeAndFlush(closeWebSocketFrame);
  87
  88         // WebSocketClientHandler will close the connection when the server
  89         // responds to the CloseWebSocketFrame.
  90         clientChannel.closeFuture().sync();
  91         group.shutdownGracefully();
  92     }
  93 }