netty.WebSocketServer.java Source code

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Here is the source code for netty.WebSocketServer.java

Source

package netty;
/*
 * 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 astro.backend.server.GameServer;
import com.fasterxml.jackson.databind.ObjectMapper;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslContextBuilder;
import io.netty.handler.ssl.util.SelfSignedCertificate;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import javax.net.ssl.SSLException;
import java.security.cert.CertificateException;

/**
 * A HTTP server which serves Web Socket requests at:
 * <p>
 * http://localhost:8080/websocket
 * <p>
 * Open your browser at http://localhost:8080/, then the demo page will be loaded and a Web Socket connection will be
 * made automatically.
 * <p>
 * This server illustrates support for the different web socket specification versions and will work with:
 * <p>
 * <ul>
 * <li>Safari 5+ (draft-ietf-hybi-thewebsocketprotocol-00)
 * <li>Chrome 6-13 (draft-ietf-hybi-thewebsocketprotocol-00)
 * <li>Chrome 14+ (draft-ietf-hybi-thewebsocketprotocol-10)
 * <li>Chrome 16+ (RFC 6455 aka draft-ietf-hybi-thewebsocketprotocol-17)
 * <li>Firefox 7+ (draft-ietf-hybi-thewebsocketprotocol-10)
 * <li>Firefox 11+ (RFC 6455 aka draft-ietf-hybi-thewebsocketprotocol-17)
 * </ul>
 */
public final class WebSocketServer {

    private static final boolean SSL = System.getProperty("ssl") != null;
    private static final int PORT = Integer.parseInt(System.getProperty("port", SSL ? "8443" : "8080"));
    private static final Logger logger = LogManager.getLogger();

    public void startServer(GameServer gameServer, ObjectMapper objectMapper) {
        // Configure SSL.

        SslContext sslCtx;
        if (SSL) {
            try {
                SelfSignedCertificate ssc = null;

                ssc = new SelfSignedCertificate();

                sslCtx = SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey()).build();
            } catch (CertificateException | SSLException e) {
                logger.error("failed to set up ssl ", e);
                sslCtx = null;
            }

        } else {
            sslCtx = null;
        }

        EventLoopGroup bossGroup = new NioEventLoopGroup(1);
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap b = new ServerBootstrap();
            b.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class)
                    .handler(new LoggingHandler(LogLevel.INFO))
                    .childHandler(new WebSocketServerInitializer(sslCtx, gameServer, objectMapper));

            Channel ch = b.bind(PORT).sync().channel();

            System.out.println("Open your web browser and navigate to " + (SSL ? "https" : "http") + "://127.0.0.1:"
                    + PORT + '/');

            ch.closeFuture().sync();
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        } finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }
}