All Downloads are FREE. Search and download functionalities are using the official Maven repository.
  • Log In
  • Register

    • com.tinkerpop.gremlin.driver.handler.WebSocketClientHandler Maven / Gradle / Ivy

    package com.tinkerpop.gremlin.driver.handler;

import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.websocketx.BinaryWebSocketFrame;
import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame;
import io.netty.handler.codec.http.websocketx.PongWebSocketFrame;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker;
import io.netty.handler.codec.http.websocketx.WebSocketFrame;
import io.netty.util.CharsetUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
* @author Stephen Mallette (http://stephen.genoprime.com)
*/
public class WebSocketClientHandler extends SimpleChannelInboundHandler {
    private static final Logger logger = LoggerFactory.getLogger(WebSocketClientHandler.class);
    private final WebSocketClientHandshaker handshaker;
    private ChannelPromise handshakeFuture;

    public WebSocketClientHandler(final WebSocketClientHandshaker handshaker) {
        this.handshaker = handshaker;
    }

    public ChannelFuture handshakeFuture() {
        return handshakeFuture;
    }

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

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

    @Override
    public void channelInactive(final ChannelHandlerContext ctx) throws Exception {
        //System.out.println("WebSocket Client disconnected!");
    }

    @Override
    protected void channelRead0(final ChannelHandlerContext ctx, final Object msg) throws Exception {
        final Channel ch = ctx.channel();
        if (!handshaker.isHandshakeComplete()) {
            // web socket client connected
            handshaker.finishHandshake(ch, (FullHttpResponse) msg);
            handshakeFuture.setSuccess();
            return;
        }

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

        // a close frame doesn't mean much here.  errors raised from closed channels will mark the host as dead
        final WebSocketFrame frame = (WebSocketFrame) msg;
        if (frame instanceof TextWebSocketFrame) {
            ctx.fireChannelRead(frame.retain(2));
        } else if (frame instanceof PongWebSocketFrame) {
        } else if (frame instanceof BinaryWebSocketFrame) {
            ctx.fireChannelRead(frame.retain(2));
        } else if (frame instanceof CloseWebSocketFrame)
            ch.close();

    }

    @Override
    public void exceptionCaught(final ChannelHandlerContext ctx, final Throwable cause) throws Exception {
        logger.warn("Exception caught during WebSocket processing - closing connection", cause);
        if (!handshakeFuture.isDone()) handshakeFuture.setFailure(cause);
        ctx.close();
    }
}
    
    
    
    

    




    
    
    © 2015 - 2025 Weber Informatics LLC | Privacy Policy