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

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Here is the source code for io.druid.storage.google.GoogleTaskLogs.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.api.client.http.InputStreamContent;
import com.google.common.base.Optional;
import com.google.common.io.ByteSource;
import com.google.inject.Inject;
import io.druid.java.util.common.logger.Logger;
import io.druid.tasklogs.TaskLogs;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.IOException;

public class GoogleTaskLogs implements TaskLogs {
    private static final Logger LOG = new Logger(GoogleTaskLogs.class);

    private final GoogleTaskLogsConfig config;
    private final GoogleStorage storage;

    @Inject
    public GoogleTaskLogs(GoogleTaskLogsConfig config, GoogleStorage storage) {
        this.config = config;
        this.storage = storage;
    }

    @Override
    public void pushTaskLog(final String taskid, final File logFile) throws IOException {
        final String taskKey = getTaskLogKey(taskid);
        LOG.info("Pushing task log %s to: %s", logFile, taskKey);

        FileInputStream fileSteam = new FileInputStream(logFile);

        InputStreamContent mediaContent = new InputStreamContent("text/plain", fileSteam);
        mediaContent.setLength(logFile.length());

        storage.insert(config.getBucket(), taskKey, mediaContent);
    }

    @Override
    public Optional<ByteSource> streamTaskLog(final String taskid, final long offset) throws IOException {
        final String taskKey = getTaskLogKey(taskid);

        try {
            if (!storage.exists(config.getBucket(), taskKey)) {
                return Optional.absent();
            }

            final long length = storage.size(config.getBucket(), taskKey);

            return Optional.<ByteSource>of(new ByteSource() {
                @Override
                public InputStream openStream() throws IOException {
                    try {
                        final long start;

                        if (offset > 0 && offset < length) {
                            start = offset;
                        } else if (offset < 0 && (-1 * offset) < length) {
                            start = length + offset;
                        } else {
                            start = 0;
                        }

                        InputStream stream = new GoogleByteSource(storage, config.getBucket(), taskKey)
                                .openStream();
                        stream.skip(start);

                        return stream;
                    } catch (Exception e) {
                        throw new IOException(e);
                    }
                }
            });
        } catch (IOException e) {
            throw new IOException(String.format("Failed to stream logs from: %s", taskKey), e);
        }
    }

    private String getTaskLogKey(String taskid) {
        return config.getPrefix() + "/" + taskid.replaceAll(":", "_");
    }

    @Override
    public void killAll() throws IOException {
        throw new UnsupportedOperationException("not implemented");
    }
}