io.netty.channel.socket.http.HttpTunnelClientPollHandler Maven / Gradle / Ivy

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/*
 * Copyright 2011 The Netty Project
 *
 * The Netty Project licenses 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 io.netty.channel.socket.http;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelStateEvent;
import io.netty.channel.Channels;
import io.netty.channel.MessageEvent;
import io.netty.channel.SimpleChannelHandler;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.HttpResponse;
import io.netty.logging.InternalLogger;
import io.netty.logging.InternalLoggerFactory;

/**
 * Pipeline component which controls the client poll loop to the server.
 */
class HttpTunnelClientPollHandler extends SimpleChannelHandler {

    public static final String NAME = "server2client";

    private static final InternalLogger LOG = InternalLoggerFactory
            .getInstance(HttpTunnelClientPollHandler.class);

    private String tunnelId;

    private final HttpTunnelClientWorkerOwner tunnelChannel;

    private long pollTime;

    public HttpTunnelClientPollHandler(HttpTunnelClientWorkerOwner tunnelChannel) {
        this.tunnelChannel = tunnelChannel;
    }

    public void setTunnelId(String tunnelId) {
        this.tunnelId = tunnelId;
    }

    @Override
    public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e)
            throws Exception {
        if (LOG.isDebugEnabled()) {
            LOG.debug("Poll channel for tunnel " + tunnelId + " established");
        }
        tunnelChannel.fullyEstablished();
        sendPoll(ctx);
    }

    @Override
    public void messageReceived(ChannelHandlerContext ctx, MessageEvent e)
            throws Exception {
        HttpResponse response = (HttpResponse) e.getMessage();

        if (HttpTunnelMessageUtils.isOKResponse(response)) {
            long rtTime = System.nanoTime() - pollTime;
            if (LOG.isDebugEnabled()) {
                LOG.debug("OK response received for poll on tunnel " +
                        tunnelId + " after " + rtTime + " ns");
            }
            tunnelChannel.onMessageReceived(response.getContent());
            sendPoll(ctx);
        } else {
            if (LOG.isWarnEnabled()) {
                LOG.warn("non-OK response received for poll on tunnel " +
                        tunnelId);
            }
        }
    }

    private void sendPoll(ChannelHandlerContext ctx) {
        pollTime = System.nanoTime();
        if (LOG.isDebugEnabled()) {
            LOG.debug("sending poll request for tunnel " + tunnelId);
        }
        HttpRequest request =
                HttpTunnelMessageUtils.createReceiveDataRequest(
                        tunnelChannel.getServerHostName(), tunnelId);
        Channels.write(ctx, Channels.future(ctx.getChannel()), request);
    }
}