reactor.ipc.netty.http.client.HttpClientWSOperations.java Source code

Introduction

Here is the source code for reactor.ipc.netty.http.client.HttpClientWSOperations.java

Source

/*
 * Copyright (c) 2011-2016 Pivotal Software Inc, All Rights Reserved.
 *
 * Licensed 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 reactor.ipc.netty.http.client;

import java.net.URI;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import java.util.function.BiConsumer;
import java.util.function.BiFunction;

import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpRequestEncoder;
import io.netty.handler.codec.http.HttpUtil;
import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame;
import io.netty.handler.codec.http.websocketx.PingWebSocketFrame;
import io.netty.handler.codec.http.websocketx.PongWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker;
import io.netty.handler.codec.http.websocketx.WebSocketClientHandshakerFactory;
import io.netty.handler.codec.http.websocketx.WebSocketVersion;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Mono;
import reactor.ipc.netty.NettyPipeline;
import reactor.ipc.netty.http.websocket.WebsocketInbound;
import reactor.ipc.netty.http.websocket.WebsocketOutbound;

/**
 * @author Stephane Maldini
 */
final class HttpClientWSOperations extends HttpClientOperations
        implements WebsocketInbound, WebsocketOutbound, BiConsumer<Void, Throwable> {

    final WebSocketClientHandshaker handshaker;
    final ChannelPromise handshakerResult;

    volatile int closeSent;

    HttpClientWSOperations(URI currentURI, String protocols, HttpClientOperations replaced) {
        super(replaced.channel(), replaced);

        Channel channel = channel();

        handshaker = WebSocketClientHandshakerFactory.newHandshaker(currentURI, WebSocketVersion.V13, protocols,
                true, replaced.requestHeaders().remove(HttpHeaderNames.HOST));

        handshakerResult = channel.newPromise();

        String handlerName = channel.pipeline().context(HttpRequestEncoder.class).name();

        if (!handlerName.equals(NettyPipeline.HttpEncoder)) {
            channel.pipeline().remove(handlerName);
        }
        handshaker.handshake(channel).addListener(f -> {
            ignoreChannelPersistence();
            channel.read();
        });
    }

    @Override
    public boolean isWebsocket() {
        return true;
    }

    @Override
    @SuppressWarnings("unchecked")
    public void onInboundNext(ChannelHandlerContext ctx, Object msg) {
        if (msg instanceof FullHttpResponse) {
            channel().pipeline().remove(HttpObjectAggregator.class);
            FullHttpResponse response = (FullHttpResponse) msg;

            setNettyResponse(response);

            if (checkResponseCode(response)) {

                if (!handshaker.isHandshakeComplete()) {
                    handshaker.finishHandshake(channel(), response);
                }

                parentContext().fireContextActive(this);
                handshakerResult.trySuccess();
            }
            return;
        }
        if (msg instanceof PingWebSocketFrame) {
            channel().writeAndFlush(new PongWebSocketFrame(((PingWebSocketFrame) msg).content().retain()));
            ctx.read();
            return;
        }
        if (msg instanceof CloseWebSocketFrame && ((CloseWebSocketFrame) msg).isFinalFragment()) {
            if (log.isDebugEnabled()) {
                log.debug("CloseWebSocketFrame detected. Closing Websocket");
            }

            CloseWebSocketFrame close = (CloseWebSocketFrame) msg;
            sendClose(new CloseWebSocketFrame(true, close.rsv(), close.content().retain()));
        } else {
            super.onInboundNext(ctx, msg);
        }
    }

    @Override
    public WebsocketInbound receiveWebsocket() {
        return this;
    }

    @Override
    protected void onInboundCancel() {
        if (log.isDebugEnabled()) {
            log.debug("Cancelling Websocket inbound. Closing Websocket");
        }
        sendClose(null);
    }

    @Override
    protected void onOutboundComplete() {
    }

    @Override
    protected void onOutboundError(Throwable err) {
        if (channel().isOpen()) {
            sendClose(new CloseWebSocketFrame(1002, "Client internal error"));
        }
    }

    void sendClose(CloseWebSocketFrame frame) {
        if (frame != null && !frame.isFinalFragment()) {
            channel().writeAndFlush(frame);
            return;
        }
        if (CLOSE_SENT.getAndSet(this, 1) == 0) {
            ChannelFuture f = channel().writeAndFlush(frame == null ? new CloseWebSocketFrame() : frame);
            f.addListener(ChannelFutureListener.CLOSE);
        }
    }

    @Override
    public void accept(Void aVoid, Throwable throwable) {
        if (log.isDebugEnabled()) {
            log.debug("Handler terminated. Closing Websocket");
        }
        if (throwable == null) {
            if (channel().isOpen()) {
                sendClose(null);
            }
        } else {
            onOutboundError(throwable);
        }
    }

    static final AtomicIntegerFieldUpdater<HttpClientWSOperations> CLOSE_SENT = AtomicIntegerFieldUpdater
            .newUpdater(HttpClientWSOperations.class, "closeSent");
}