spark.network.netty.FileServerHandler.java Source code

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Here is the source code for spark.network.netty.FileServerHandler.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 spark.network.netty;

import java.io.File;
import java.io.FileInputStream;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundMessageHandlerAdapter;
import io.netty.channel.DefaultFileRegion;

class FileServerHandler extends ChannelInboundMessageHandlerAdapter<String> {

    PathResolver pResolver;

    public FileServerHandler(PathResolver pResolver) {
        this.pResolver = pResolver;
    }

    @Override
    public void messageReceived(ChannelHandlerContext ctx, String blockId) {
        String path = pResolver.getAbsolutePath(blockId);
        // if getFilePath returns null, close the channel
        if (path == null) {
            //ctx.close();
            return;
        }
        File file = new File(path);
        if (file.exists()) {
            if (!file.isFile()) {
                //logger.info("Not a file : " + file.getAbsolutePath());
                ctx.write(new FileHeader(0, blockId).buffer());
                ctx.flush();
                return;
            }
            long length = file.length();
            if (length > Integer.MAX_VALUE || length <= 0) {
                //logger.info("too large file : " + file.getAbsolutePath() + " of size "+ length);
                ctx.write(new FileHeader(0, blockId).buffer());
                ctx.flush();
                return;
            }
            int len = new Long(length).intValue();
            //logger.info("Sending block "+blockId+" filelen = "+len);
            //logger.info("header = "+ (new FileHeader(len, blockId)).buffer());
            ctx.write((new FileHeader(len, blockId)).buffer());
            try {
                ctx.sendFile(new DefaultFileRegion(new FileInputStream(file).getChannel(), 0, file.length()));
            } catch (Exception e) {
                //logger.warning("Exception when sending file : " + file.getAbsolutePath());
                e.printStackTrace();
            }
        } else {
            //logger.warning("File not found: " + file.getAbsolutePath());
            ctx.write(new FileHeader(0, blockId).buffer());
        }
        ctx.flush();
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        cause.printStackTrace();
        ctx.close();
    }
}