io.druid.firehose.s3.StaticS3FirehoseFactory.java Source code

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Here is the source code for io.druid.firehose.s3.StaticS3FirehoseFactory.java

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/*
 * Druid - a distributed column store.
 * Copyright 2012 - 2015 Metamarkets Group Inc.
 *
 * 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.druid.firehose.s3;

import com.fasterxml.jackson.annotation.JacksonInject;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.base.Charsets;
import com.google.common.base.Preconditions;
import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.metamx.common.CompressionUtils;
import com.metamx.common.logger.Logger;
import io.druid.data.input.Firehose;
import io.druid.data.input.FirehoseFactory;
import io.druid.data.input.impl.FileIteratingFirehose;
import io.druid.data.input.impl.StringInputRowParser;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.LineIterator;
import org.jets3t.service.impl.rest.httpclient.RestS3Service;
import org.jets3t.service.model.S3Bucket;
import org.jets3t.service.model.S3Object;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URI;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.zip.GZIPInputStream;

/**
 * Builds firehoses that read from a predefined list of S3 objects and then dry up.
 */
public class StaticS3FirehoseFactory implements FirehoseFactory<StringInputRowParser> {
    private static final Logger log = new Logger(StaticS3FirehoseFactory.class);

    private final RestS3Service s3Client;
    private final List<URI> uris;

    @JsonCreator
    public StaticS3FirehoseFactory(@JacksonInject("s3Client") RestS3Service s3Client,
            @JsonProperty("uris") List<URI> uris) {
        this.s3Client = s3Client;
        this.uris = ImmutableList.copyOf(uris);

        for (final URI inputURI : uris) {
            Preconditions.checkArgument(inputURI.getScheme().equals("s3"), "input uri scheme == s3 (%s)", inputURI);
        }
    }

    @JsonProperty
    public List<URI> getUris() {
        return uris;
    }

    @Override
    public Firehose connect(StringInputRowParser firehoseParser) throws IOException {
        Preconditions.checkNotNull(s3Client, "null s3Client");

        final LinkedList<URI> objectQueue = Lists.newLinkedList(uris);

        return new FileIteratingFirehose(new Iterator<LineIterator>() {
            @Override
            public boolean hasNext() {
                return !objectQueue.isEmpty();
            }

            @Override
            public LineIterator next() {
                final URI nextURI = objectQueue.poll();

                final String s3Bucket = nextURI.getAuthority();
                final S3Object s3Object = new S3Object(
                        nextURI.getPath().startsWith("/") ? nextURI.getPath().substring(1) : nextURI.getPath());

                log.info("Reading from bucket[%s] object[%s] (%s)", s3Bucket, s3Object.getKey(), nextURI);

                try {
                    final InputStream innerInputStream = s3Client
                            .getObject(new S3Bucket(s3Bucket), s3Object.getKey()).getDataInputStream();

                    final InputStream outerInputStream = s3Object.getKey().endsWith(".gz")
                            ? CompressionUtils.gzipInputStream(innerInputStream)
                            : innerInputStream;

                    return IOUtils.lineIterator(
                            new BufferedReader(new InputStreamReader(outerInputStream, Charsets.UTF_8)));
                } catch (Exception e) {
                    log.error(e, "Exception reading from bucket[%s] object[%s]", s3Bucket, s3Object.getKey());

                    throw Throwables.propagate(e);
                }
            }

            @Override
            public void remove() {
                throw new UnsupportedOperationException();
            }
        }, firehoseParser);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        StaticS3FirehoseFactory factory = (StaticS3FirehoseFactory) o;

        return !(uris != null ? !uris.equals(factory.uris) : factory.uris != null);

    }

    @Override
    public int hashCode() {
        return uris != null ? uris.hashCode() : 0;
    }
}