com.spotify.ffwd.http.HttpProtocolServer.java Source code

Introduction

Here is the source code for com.spotify.ffwd.http.HttpProtocolServer.java

Source

/*-
 * -\-\-
 * FastForward HTTP Module
 * --
 * Copyright (C) 2016 - 2018 Spotify AB
 * --
 * 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 com.spotify.ffwd.http;

import com.google.inject.Inject;
import com.spotify.ffwd.protocol.ProtocolServer;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandler;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelInitializer;
import io.netty.handler.codec.DecoderException;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.HttpContentDecompressor;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpRequestDecoder;
import io.netty.handler.codec.http.HttpResponseEncoder;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http.HttpVersion;
import lombok.extern.slf4j.Slf4j;

/**
 * Decode individual frames, should only be used with UDP protocols.
 *
 * @author udoprog
 */
@Slf4j
public class HttpProtocolServer implements ProtocolServer {
    @Inject
    private ChannelInboundHandler handler;

    @Inject
    private HttpDecoder decoder;

    @Override
    public final ChannelInitializer<Channel> initializer() {
        return new ChannelInitializer<Channel>() {
            @Override
            protected void initChannel(Channel ch) throws Exception {
                final ChannelInboundHandlerAdapter exceptionHandler = new ChannelInboundHandlerAdapter() {
                    @Override
                    public void exceptionCaught(final ChannelHandlerContext ctx, final Throwable cause)
                            throws Exception {
                        if (cause instanceof HttpException) {
                            final HttpException e = (HttpException) cause;
                            sendResponse(ctx, e.getStatus());
                            return;
                        }

                        if (cause instanceof DecoderException) {
                            exceptionCaught(ctx, cause.getCause());
                            return;
                        }

                        log.error("error in pipeline: ", cause);
                        sendResponse(ctx, HttpResponseStatus.INTERNAL_SERVER_ERROR);
                    }
                };
                ch.pipeline().addLast(new HttpRequestDecoder(), new HttpContentDecompressor(),
                        new HttpObjectAggregator(Integer.MAX_VALUE), decoder, exceptionHandler, handler);
                ch.pipeline().addLast(new HttpResponseEncoder());
            }
        };
    }

    private void sendResponse(final ChannelHandlerContext ctx, final HttpResponseStatus status) {
        ctx.channel().writeAndFlush(new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, status))
                .addListener((ChannelFutureListener) future -> future.channel().close());
    }
}