reactor.ipc.netty.http.server.HttpServerWSOperations.java Source code

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Here is the source code for reactor.ipc.netty.http.server.HttpServerWSOperations.java

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/*
 * 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.server;

import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import java.util.function.BiConsumer;

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.DefaultFullHttpRequest;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.netty.handler.codec.http.HttpRequest;
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.WebSocketServerHandshaker;
import io.netty.handler.codec.http.websocketx.WebSocketServerHandshakerFactory;
import io.netty.util.ReferenceCountUtil;
import reactor.ipc.netty.NettyPipeline;
import reactor.ipc.netty.http.HttpOperations;
import reactor.ipc.netty.http.websocket.WebsocketInbound;
import reactor.ipc.netty.http.websocket.WebsocketOutbound;

/**
 * Conversion between Netty types  and Reactor types ({@link HttpOperations}
 *
 * @author Stephane Maldini
 */
final class HttpServerWSOperations extends HttpServerOperations
        implements WebsocketInbound, WebsocketOutbound, BiConsumer<Void, Throwable> {

    final WebSocketServerHandshaker handshaker;
    final ChannelPromise handshakerResult;

    volatile int closeSent;

    public HttpServerWSOperations(String wsUrl, String protocols, HttpServerOperations replaced) {
        super(replaced.channel(), replaced);

        Channel channel = replaced.channel();

        // Handshake
        WebSocketServerHandshakerFactory wsFactory = new WebSocketServerHandshakerFactory(wsUrl, protocols, true);
        handshaker = wsFactory.newHandshaker(replaced.nettyRequest);
        if (handshaker == null) {
            WebSocketServerHandshakerFactory.sendUnsupportedVersionResponse(channel);
            handshakerResult = null;
        } else {
            removeHandler(NettyPipeline.HttpServerHandler);

            handshakerResult = channel.newPromise();
            HttpRequest request = new DefaultFullHttpRequest(replaced.version(), replaced.method(), replaced.uri());

            request.headers().set(replaced.nettyRequest.headers());

            handshaker.handshake(channel, request,
                    replaced.nettyResponse.headers().remove(HttpHeaderNames.TRANSFER_ENCODING), handshakerResult)
                    .addListener(f -> ignoreChannelPersistence());
        }
    }

    @Override
    public void onInboundNext(ChannelHandlerContext ctx, Object frame) {
        if (frame instanceof CloseWebSocketFrame && ((CloseWebSocketFrame) frame).isFinalFragment()) {
            if (log.isDebugEnabled()) {
                log.debug("CloseWebSocketFrame detected. Closing Websocket");
            }
            CloseWebSocketFrame close = (CloseWebSocketFrame) frame;
            sendClose(new CloseWebSocketFrame(true, close.rsv(), close.content().retain()),
                    f -> onHandlerTerminate());
            return;
        }
        if (frame instanceof PingWebSocketFrame) {
            ctx.writeAndFlush(new PongWebSocketFrame(((PingWebSocketFrame) frame).content().retain()));
            ctx.read();
            return;
        }
        super.onInboundNext(ctx, frame);
    }

    @Override
    protected void onOutboundComplete() {
    }

    @Override
    public void accept(Void aVoid, Throwable throwable) {
        if (throwable == null) {
            if (channel().isOpen()) {
                sendClose(null, f -> onHandlerTerminate());
            }
        } else {
            onOutboundError(throwable);
        }
    }

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

    void sendClose(CloseWebSocketFrame frame, ChannelFutureListener listener) {
        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);
            if (listener != null) {
                f.addListener(listener);
            }
            return;
        }
        ReferenceCountUtil.retain(frame);
    }

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

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