io.druid.storage.google.GoogleDataSegmentPuller.java Source code

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Here is the source code for io.druid.storage.google.GoogleDataSegmentPuller.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.storage.google;

import com.google.common.base.Predicate;
import com.google.inject.Inject;
import io.druid.java.util.common.CompressionUtils;
import io.druid.java.util.common.FileUtils;
import io.druid.java.util.common.ISE;
import io.druid.java.util.common.MapUtils;
import io.druid.java.util.common.logger.Logger;
import io.druid.segment.loading.DataSegmentPuller;
import io.druid.segment.loading.SegmentLoadingException;
import io.druid.segment.loading.URIDataPuller;
import io.druid.timeline.DataSegment;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.util.Map;

public class GoogleDataSegmentPuller implements DataSegmentPuller, URIDataPuller {
    private static final Logger LOG = new Logger(GoogleDataSegmentPuller.class);

    private final GoogleStorage storage;

    @Inject
    public GoogleDataSegmentPuller(final GoogleStorage storage) {
        this.storage = storage;
    }

    @Override
    public void getSegmentFiles(final DataSegment segment, final File outDir) throws SegmentLoadingException {
        final Map<String, Object> loadSpec = segment.getLoadSpec();
        final String bucket = MapUtils.getString(loadSpec, "bucket");
        final String path = MapUtils.getString(loadSpec, "path");

        getSegmentFiles(bucket, path, outDir);
    }

    public FileUtils.FileCopyResult getSegmentFiles(final String bucket, final String path, File outDir)
            throws SegmentLoadingException {
        LOG.info("Pulling index at path[%s] to outDir[%s]", bucket, path, outDir.getAbsolutePath());

        prepareOutDir(outDir);

        try {
            final GoogleByteSource byteSource = new GoogleByteSource(storage, bucket, path);
            final FileUtils.FileCopyResult result = CompressionUtils.unzip(byteSource, outDir,
                    GoogleUtils.GOOGLE_RETRY, true);
            LOG.info("Loaded %d bytes from [%s] to [%s]", result.size(), path, outDir.getAbsolutePath());
            return result;
        } catch (Exception e) {
            try {
                org.apache.commons.io.FileUtils.deleteDirectory(outDir);
            } catch (IOException ioe) {
                LOG.warn(ioe, "Failed to remove output directory [%s] for segment pulled from [%s]",
                        outDir.getAbsolutePath(), path);
            }
            throw new SegmentLoadingException(e, e.getMessage());
        }
    }

    // Needs to be public for the tests.
    public void prepareOutDir(final File outDir) throws ISE {
        if (!outDir.exists()) {
            outDir.mkdirs();
        }

        if (!outDir.isDirectory()) {
            throw new ISE("outDir[%s] must be a directory.", outDir);
        }
    }

    @Override
    public InputStream getInputStream(URI uri) throws IOException {
        String path = uri.getPath();
        if (path.startsWith("/")) {
            path = path.substring(1);
        }
        return storage.get(uri.getHost(), path);
    }

    @Override
    public String getVersion(URI uri) throws IOException {
        String path = uri.getPath();
        if (path.startsWith("/")) {
            path = path.substring(1);
        }
        return storage.version(uri.getHost(), path);
    }

    @Override
    public Predicate<Throwable> shouldRetryPredicate() {
        return new Predicate<Throwable>() {
            @Override
            public boolean apply(Throwable e) {
                if (e == null) {
                    return false;
                }
                if (GoogleUtils.GOOGLE_RETRY.apply(e)) {
                    return true;
                }
                // Look all the way down the cause chain, just in case something wraps it deep.
                return apply(e.getCause());
            }
        };
    }
}