io.druid.firehose.oss.StaticOSSFirehoseFactory.java Source code

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Here is the source code for io.druid.firehose.oss.StaticOSSFirehoseFactory.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.oss;

import com.aliyun.oss.OSSClient;
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 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;

/**
 * Builds firehoses that read from a predefined list of S3 objects and then dry up.
 */
public class StaticOSSFirehoseFactory implements FirehoseFactory<StringInputRowParser> {

    private static final Logger log = new Logger(StaticOSSFirehoseFactory.class);

    private final OSSClient ossClient;
    private final List<URI> uris;

    @JsonCreator
    public StaticOSSFirehoseFactory(@JacksonInject("ossClient") OSSClient ossClient,
            @JsonProperty("uris") List<URI> uris) {
        this.ossClient = ossClient;
        this.uris = ImmutableList.copyOf(uris);

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

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

    @Override
    public Firehose connect(StringInputRowParser firehoseParser) throws IOException {

        Preconditions.checkNotNull(ossClient, "null ossClient");

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

                log.info("reading from bucket[%s] object[%s] (%s)", bucket, key, nextURI);

                try {
                    final InputStream innerInputStream = ossClient.getObject(bucket, key).getObjectContent();

                    final InputStream outerInputStream = key.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]", bucket, key);

                    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;
        }

        StaticOSSFirehoseFactory factory = (StaticOSSFirehoseFactory) o;

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

    }

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