io.termd.core.http.netty.TtyWebSocketFrameHandler.java Source code

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Here is the source code for io.termd.core.http.netty.TtyWebSocketFrameHandler.java

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/*
 * Copyright 2015 Julien Viet
 *
 * 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.termd.core.http.netty;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.group.ChannelGroup;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
import io.termd.core.http.HttpTtyConnection;
import io.termd.core.tty.TtyConnection;

import java.util.concurrent.TimeUnit;
import java.util.function.Consumer;

/**
 * @author <a href="mailto:julien@julienviet.com">Julien Viet</a>
 */
public class TtyWebSocketFrameHandler extends SimpleChannelInboundHandler<TextWebSocketFrame> {

    private final ChannelGroup group;
    private final Consumer<TtyConnection> handler;
    private ChannelHandlerContext context;
    private HttpTtyConnection conn;

    public TtyWebSocketFrameHandler(ChannelGroup group, Consumer<TtyConnection> handler) {
        this.group = group;
        this.handler = handler;
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        super.channelActive(ctx);
        context = ctx;
    }

    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
        if (evt == WebSocketServerProtocolHandler.ServerHandshakeStateEvent.HANDSHAKE_COMPLETE) {
            ctx.pipeline().remove(HttpRequestHandler.class);
            group.add(ctx.channel());
            conn = new HttpTtyConnection() {
                @Override
                protected void write(byte[] buffer) {
                    ByteBuf byteBuf = Unpooled.buffer();
                    byteBuf.writeBytes(buffer);
                    context.writeAndFlush(new TextWebSocketFrame(byteBuf));
                }

                @Override
                public void schedule(Runnable task, long delay, TimeUnit unit) {
                    context.executor().schedule(task, delay, unit);
                }

                @Override
                public void execute(Runnable task) {
                    context.executor().execute(task);
                }

                @Override
                public void close() {
                    context.close();
                }
            };
            handler.accept(conn);
        } else {
            super.userEventTriggered(ctx, evt);
        }
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        HttpTtyConnection tmp = conn;
        context = null;
        conn = null;
        if (tmp != null) {
            Consumer<Void> closeHandler = tmp.getCloseHandler();
            if (closeHandler != null) {
                closeHandler.accept(null);
            }
        }
    }

    public void channelRead0(ChannelHandlerContext ctx, TextWebSocketFrame msg) throws Exception {
        conn.writeToDecoder(msg.text());
    }
}