com.uber.tchannel.handlers.InitRequestHandler.java Source code

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Here is the source code for com.uber.tchannel.handlers.InitRequestHandler.java

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/*
 * Copyright (c) 2015 Uber Technologies, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.uber.tchannel.handlers;

import com.uber.tchannel.channels.PeerManager;
import com.uber.tchannel.codecs.MessageCodec;
import com.uber.tchannel.codecs.TFrame;
import com.uber.tchannel.errors.ErrorType;
import com.uber.tchannel.frames.Frame;
import com.uber.tchannel.frames.InitFrame;
import com.uber.tchannel.frames.InitRequestFrame;
import com.uber.tchannel.frames.InitResponseFrame;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;

import static com.uber.tchannel.frames.ErrorFrame.sendError;

public class InitRequestHandler extends SimpleChannelInboundHandler<ByteBuf> {

    private final PeerManager peerManager;

    public InitRequestHandler(PeerManager peerManager) {
        this.peerManager = peerManager;
    }

    @Override
    public void messageReceived(ChannelHandlerContext ctx, ByteBuf buf) throws Exception {

        Frame frame = MessageCodec.decode(MessageCodec.decode(buf));

        switch (frame.getType()) {

        case InitRequest:

            InitRequestFrame initRequestFrameMessage = (InitRequestFrame) frame;

            if (initRequestFrameMessage.getVersion() == InitFrame.DEFAULT_VERSION) {

                InitResponseFrame initResponseFrame = new InitResponseFrame(initRequestFrameMessage.getId(),
                        InitFrame.DEFAULT_VERSION);

                initResponseFrame.setHostPort(this.peerManager.getHostPort());

                // TODO: figure out what to put here
                initResponseFrame.setProcessName("java-process");
                MessageCodec.write(ctx, initResponseFrame);
                ctx.pipeline().remove(this);
                peerManager.setIdentified(ctx.channel(), initRequestFrameMessage.getHeaders());

            } else {
                sendError(ErrorType.FatalProtocolError,
                        String.format("Expected Protocol version: %d, got version: %d", InitFrame.DEFAULT_VERSION,
                                initRequestFrameMessage.getVersion()),
                        frame.getId(), ctx);
            }

            break;

        default:
            sendError(ErrorType.FatalProtocolError, "The first frame should be an Init Request", frame.getId(),
                    ctx);
            break;
        }
    }
}