io.werval.server.netty.SubProtocolSwitchHandler.java Source code

Introduction

Here is the source code for io.werval.server.netty.SubProtocolSwitchHandler.java

Source

/*
 * Copyright (c) 2013-2014 the original author or authors
 *
 * 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 io.werval.server.netty;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.group.ChannelGroup;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.websocketx.WebSocketFrame;
import io.werval.spi.ApplicationSPI;
import io.werval.spi.dev.DevShellSPI;
import io.werval.spi.server.HttpServerHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static io.werval.runtime.ConfigKeys.WERVAL_HTTP_REQUESTS_BODY_DISK_THRESHOLD;
import static io.werval.runtime.ConfigKeys.WERVAL_HTTP_REQUESTS_BODY_MAX_SIZE;

/**
 * Distinguish HttpRequests and WebSocketFrames and setup the pipeline accordingly.
 */
public class SubProtocolSwitchHandler extends SimpleChannelInboundHandler<Object> {
    private static final Logger LOG = LoggerFactory.getLogger(SubProtocolSwitchHandler.class);
    private final ChannelGroup allChannels;
    private final ApplicationSPI app;
    private final DevShellSPI devSpi;
    private final HttpServerHelper helper = new HttpServerHelper();

    public SubProtocolSwitchHandler(ChannelGroup allChannels, ApplicationSPI app, DevShellSPI devSpi) {
        super();
        this.allChannels = allChannels;
        this.app = app;
        this.devSpi = devSpi;
    }

    @Override
    public void channelActive(ChannelHandlerContext context) {
        allChannels.add(context.channel());
    }

    @Override
    protected void channelRead0(ChannelHandlerContext context, Object message) throws Exception {
        if (message instanceof HttpRequest) {
            HttpRequest request = (HttpRequest) message;
            LOG.trace("Switching to plain HTTP protocol");
            ChannelPipeline pipeline = context.pipeline();

            int maxBodySize = app.config().intNumber(WERVAL_HTTP_REQUESTS_BODY_MAX_SIZE);
            int diskThreshold = app.config().intNumber(WERVAL_HTTP_REQUESTS_BODY_DISK_THRESHOLD);
            pipeline.addLast("http-aggregator",
                    new HttpRequestAggregator(helper, app.events(), maxBodySize, diskThreshold, app.tmpdir()));
            pipeline.addLast("werval-http", new WervalHttpHandler(app, devSpi));

            pipeline.remove(this);

            context.fireChannelRead(request);
        } else if (message instanceof WebSocketFrame) {
            WebSocketFrame frame = (WebSocketFrame) message;
            LOG.trace("Switching to WebSocket protocol");
            ChannelPipeline pipeline = context.pipeline();

            pipeline.addLast("werval-websocket", new WervalSocketHandler(app, devSpi));

            pipeline.remove(this);

            frame.retain(); // TODO Check this
            context.fireChannelRead(frame);
        } else {
            LOG.warn("Received a message of an unknown type ({}), channel will be closed.", message.getClass());
            context.channel().close();
        }
    }
}