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jsync.io is a non-blocking, event-driven networking framework for Java
There is a newer version: 1.10.13
/*
 * Copyright (c) 2011-2013 The original author or authors
 * ------------------------------------------------------
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Apache License v2.0 which accompanies this distribution.
 *
 *     The Eclipse Public License is available at
 *     http://www.eclipse.org/legal/epl-v10.html
 *
 *     The Apache License v2.0 is available at
 *     http://www.opensource.org/licenses/apache2.0.php
 *
 * You may elect to redistribute this code under either of these licenses.
 */
package io.jsync.http.impl;

import io.jsync.http.WebSocketFrame.FrameType;
import io.jsync.http.impl.ws.DefaultWebSocketFrame;
import io.jsync.http.impl.ws.WebSocketFrameInternal;
import io.jsync.impl.AsyncInternal;
import io.jsync.impl.DefaultContext;
import io.jsync.net.impl.AsyncHandler;
import io.jsync.net.impl.ConnectionBase;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.buffer.ByteBufHolder;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.handler.codec.DecoderResult;
import io.netty.handler.codec.http.DefaultHttpContent;
import io.netty.handler.codec.http.HttpContent;
import io.netty.handler.codec.http.HttpObject;
import io.netty.handler.codec.http.LastHttpContent;
import io.netty.handler.codec.http.websocketx.*;

import java.util.Map;

import static io.jsync.http.WebSocketFrame.FrameType.*;

/**
 * @author Norman Maurer
 */
public abstract class AsyncHttpHandler extends AsyncHandler {
    private final AsyncInternal async;

    protected AsyncHttpHandler(AsyncInternal async, Map connectionMap) {
        super(async, connectionMap);
        this.async = async;
    }

    private static ByteBuf safeBuffer(ByteBufHolder holder, ByteBufAllocator allocator) {
        return safeBuffer(holder.content(), allocator);
    }

    @Override
    protected void channelRead(final C connection, final DefaultContext context, final ChannelHandlerContext chctx, final Object msg) throws Exception {
        if (msg instanceof HttpObject) {
            DecoderResult result = ((HttpObject) msg).getDecoderResult();
            if (result.isFailure()) {
                chctx.pipeline().fireExceptionCaught(result.cause());
                return;
            }
        }
        if (connection != null) {
            // we are reading from the channel
            Channel ch = chctx.channel();
            // We need to do this since it's possible the server is being used from a worker context
            if (context.isOnCorrectWorker(ch.eventLoop())) {
                try {
                    async.setContext(context);
                    doMessageReceived(connection, chctx, msg);
                } catch (Throwable t) {
                    context.reportException(t);
                }
            } else {
                context.execute(new Runnable() {
                    public void run() {
                        try {
                            doMessageReceived(connection, chctx, msg);
                        } catch (Throwable t) {
                            context.reportException(t);
                        }
                    }
                });
            }
        } else {
            try {
                doMessageReceived(connection, chctx, msg);
            } catch (Throwable t) {
                chctx.pipeline().fireExceptionCaught(t);
            }
        }
    }

    @Override
    protected Object safeObject(Object msg, ByteBufAllocator allocator) throws Exception {
        if (msg instanceof HttpContent) {
            HttpContent content = (HttpContent) msg;
            ByteBuf buf = content.content();
            if (buf != Unpooled.EMPTY_BUFFER && buf.isDirect()) {
                ByteBuf newBuf = safeBuffer(content, allocator);
                if (msg instanceof LastHttpContent) {
                    LastHttpContent last = (LastHttpContent) msg;
                    return new AssembledLastHttpContent(newBuf, last.trailingHeaders(), last.getDecoderResult());
                } else {
                    return new DefaultHttpContent(newBuf);
                }
            }
        } else if (msg instanceof WebSocketFrame) {
            ByteBuf payload = safeBuffer((WebSocketFrame) msg, allocator);
            boolean isFinal = ((WebSocketFrame) msg).isFinalFragment();
            FrameType frameType;
            if (msg instanceof BinaryWebSocketFrame) {
                frameType = BINARY;
            } else if (msg instanceof CloseWebSocketFrame) {
                frameType = CLOSE;
            } else if (msg instanceof PingWebSocketFrame) {
                frameType = PING;
            } else if (msg instanceof PongWebSocketFrame) {
                frameType = PONG;
            } else if (msg instanceof TextWebSocketFrame) {
                frameType = TEXT;
            } else if (msg instanceof ContinuationWebSocketFrame) {
                frameType = CONTINUATION;
            } else {
                throw new IllegalStateException("Unsupported websocket msg " + msg);
            }
            return new DefaultWebSocketFrame(frameType, payload, isFinal);
        }
        return msg;
    }


    @Override
    public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
        if (msg instanceof WebSocketFrameInternal) {
            WebSocketFrameInternal frame = (WebSocketFrameInternal) msg;
            ByteBuf buf = frame.getBinaryData();
            if (buf != Unpooled.EMPTY_BUFFER) {
                buf = safeBuffer(buf, ctx.alloc());
            }
            switch (frame.type()) {
                case BINARY:
                    msg = new BinaryWebSocketFrame(buf);
                    break;
                case TEXT:
                    msg = new TextWebSocketFrame(buf);
                    break;
                case CLOSE:
                    msg = new CloseWebSocketFrame(true, 0, buf);
                    break;
                case CONTINUATION:
                    msg = new ContinuationWebSocketFrame(buf);
                    break;
                case PONG:
                    msg = new PongWebSocketFrame(buf);
                    break;
                case PING:
                    msg = new PingWebSocketFrame(buf);
                    break;
                default:
                    throw new IllegalStateException("Unsupported websocket msg " + msg);
            }
        }
        ctx.write(msg, promise);
    }

    protected abstract void doMessageReceived(C connection, ChannelHandlerContext ctx, Object msg) throws Exception;

}