ws.wamp.jawampa.transport.WampClientWebsocketHandler.java Source code

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Here is the source code for ws.wamp.jawampa.transport.WampClientWebsocketHandler.java

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/*
 * Copyright 2014 Matthias Einwag
 *
 * The jawampa authors license 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.
 */

package ws.wamp.jawampa.transport;

import ws.wamp.jawampa.WampError;

import com.fasterxml.jackson.databind.ObjectMapper;

import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker;
import io.netty.handler.codec.http.websocketx.WebSocketClientProtocolHandler;

public class WampClientWebsocketHandler extends ChannelInboundHandlerAdapter {

    final WebSocketClientHandshaker handshaker;
    final ObjectMapper objectMapper;

    Serialization serialization;

    public Serialization serialization() {
        return serialization;
    }

    public WampClientWebsocketHandler(WebSocketClientHandshaker handshaker, ObjectMapper objectMapper) {
        this.handshaker = handshaker;
        this.objectMapper = objectMapper;
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        ctx.fireChannelActive();
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        ctx.fireChannelInactive();
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        if (msg instanceof CloseWebSocketFrame) {
            //readState = ReadState.Closed;
            handshaker.close(ctx.channel(), (CloseWebSocketFrame) msg).addListener(ChannelFutureListener.CLOSE);
        } else {
            ctx.fireChannelRead(msg);
        }
    }

    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
        if (evt == WebSocketClientProtocolHandler.ClientHandshakeStateEvent.HANDSHAKE_COMPLETE) {
            // Handshake is completed
            String actualProtocol = handshaker.actualSubprotocol();
            if (actualProtocol.equals("wamp.2.json")) {
                serialization = Serialization.Json;
            }
            //            else if (actualProtocol.equals("wamp.2.msgpack")) {
            //                serialization = Serialization.MessagePack;
            //            }
            else { // We don't want that protocol
                throw new WampError("Invalid Websocket Protocol");
            }

            // Install the serializer and deserializer
            ctx.pipeline().addAfter(ctx.name(), "wamp-deserializer",
                    new WampDeserializationHandler(serialization, objectMapper));
            ctx.pipeline().addAfter(ctx.name(), "wamp-serializer",
                    new WampSerializationHandler(serialization, objectMapper));

            // Fire the connection established event
            ctx.fireUserEventTriggered(WampChannelEvents.WEBSOCKET_CONN_ESTABLISHED);

        } else {
            ctx.fireUserEventTriggered(evt);
        }
    }
}