io.druid.firehose.google.StaticGoogleBlobStoreFirehoseFactory.java Source code

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Here is the source code for io.druid.firehose.google.StaticGoogleBlobStoreFirehoseFactory.java

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/*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Metamarkets 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 io.druid.firehose.google;

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 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 io.druid.java.util.common.CompressionUtils;
import io.druid.java.util.common.logger.Logger;
import io.druid.storage.google.GoogleByteSource;
import io.druid.storage.google.GoogleStorage;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.LineIterator;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

public class StaticGoogleBlobStoreFirehoseFactory implements FirehoseFactory<StringInputRowParser> {
    private static final Logger LOG = new Logger(StaticGoogleBlobStoreFirehoseFactory.class);

    private final GoogleStorage storage;
    private final List<GoogleBlob> blobs;

    @JsonCreator
    public StaticGoogleBlobStoreFirehoseFactory(@JacksonInject GoogleStorage storage,
            @JsonProperty("blobs") GoogleBlob[] blobs) {
        this.storage = storage;
        this.blobs = ImmutableList.copyOf(blobs);
    }

    @JsonProperty
    public List<GoogleBlob> getBlobs() {
        return blobs;
    }

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

        final LinkedList<GoogleBlob> objectQueue = Lists.newLinkedList(blobs);

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

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

                final String bucket = nextURI.getBucket();
                final String path = nextURI.getPath().startsWith("/") ? nextURI.getPath().substring(1)
                        : nextURI.getPath();

                try {
                    final InputStream innerInputStream = new GoogleByteSource(storage, bucket, path).openStream();

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

                    return IOUtils.lineIterator(
                            new BufferedReader(new InputStreamReader(outerInputStream, Charsets.UTF_8)));
                } catch (Exception e) {
                    LOG.error(e, "Exception opening bucket[%s] blob[%s]", bucket, path);

                    throw Throwables.propagate(e);
                }
            }

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