io.druid.storage.azure.AzureTaskLogs.java Source code

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Here is the source code for io.druid.storage.azure.AzureTaskLogs.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.storage.azure;

import com.google.common.base.Optional;
import com.google.common.base.Throwables;
import com.google.common.io.ByteSource;
import com.google.inject.Inject;
import com.metamx.common.logger.Logger;
import com.microsoft.azure.storage.StorageException;
import io.druid.tasklogs.TaskLogs;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URISyntaxException;
import java.util.concurrent.Callable;

public class AzureTaskLogs implements TaskLogs {

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

    private final AzureTaskLogsConfig config;
    private final AzureStorage azureStorage;

    @Inject
    public AzureTaskLogs(AzureTaskLogsConfig config, AzureStorage azureStorage) {
        this.config = config;
        this.azureStorage = azureStorage;
    }

    @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);

        try {
            AzureUtils.retryAzureOperation(new Callable<Void>() {
                @Override
                public Void call() throws Exception {
                    azureStorage.uploadBlob(logFile, config.getContainer(), taskKey);
                    return null;
                }
            }, config.getMaxTries());
        } catch (Exception e) {
            throw Throwables.propagate(e);
        }
    }

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

        try {
            if (!azureStorage.getBlobExists(container, taskKey))
                return Optional.absent();

            return Optional.<ByteSource>of(new ByteSource() {
                @Override
                public InputStream openStream() throws IOException {
                    try {
                        final long start;
                        final long length = azureStorage.getBlobLength(container, taskKey);

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

                        InputStream stream = azureStorage.getBlobInputStream(container, taskKey);
                        stream.skip(start);

                        return stream;

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

    private String getTaskLogKey(String taskid) {
        return String.format("%s/%s/log", config.getPrefix(), taskid);
    }
}