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    • io.higgs.ws.client.WebSocketClientHandler Maven / Gradle / Ivy

    package io.higgs.ws.client;

import io.higgs.events.Events;
import io.netty.channel.*;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.websocketx.*;
import io.netty.util.CharsetUtil;

import static io.higgs.ws.client.WebSocketEvent.*;

/**
 * @author Courtney Robinson 
 */
public class WebSocketClientHandler extends SimpleChannelInboundHandler {

    protected final Events events;
    private final WebSocketClientHandshaker handshaker;
    private ChannelPromise handshakeFuture;

    public WebSocketClientHandler(WebSocketClientHandshaker handshaker, Events events) {
        this.handshaker = handshaker;
        this.events = events;
    }

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        handshakeFuture = ctx.newPromise();
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        handshaker.handshake(ctx.channel());
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        events.emit(DISCONNECT, ctx);
    }

    @Override
    public void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception {
        Channel ch = ctx.channel();
        if (!handshaker.isHandshakeComplete()) {
            handshaker.finishHandshake(ch, (FullHttpResponse) msg);
            events.emit(CONNECT, ctx);
            handshakeFuture.setSuccess();
            return;
        }

        if (msg instanceof FullHttpResponse) {
            FullHttpResponse response = (FullHttpResponse) msg;
            throw new Exception("Unexpected FullHttpResponse (getStatus=" + response.getStatus() + ", content="
                    + response.content().toString(CharsetUtil.UTF_8) + ')');
        }

        WebSocketFrame frame = (WebSocketFrame) msg;
        if (frame instanceof TextWebSocketFrame) {
            //emit frame as first param in case of a function since they only accept the first param emitted
            events.emit(MESSAGE, new WebSocketMessage(((TextWebSocketFrame) frame).text()), ctx);
        } else if (frame instanceof PongWebSocketFrame) {
            events.emit(PONG, ctx, frame);
        } else if (frame instanceof CloseWebSocketFrame) {
            ch.close();
        }
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        if (!handshakeFuture.isDone()) {
            handshakeFuture.setFailure(cause);
        }
        events.emit(ERROR, ctx, cause);
        ctx.close();
    }
}
    
    
    
    

    




    
    
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