io.druid.storage.s3.FileSessionCredentialsProvider.java Source code

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Here is the source code for io.druid.storage.s3.FileSessionCredentialsProvider.java

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/*
 * Druid - a distributed column store.
 * Copyright (C) 2012, 2013  Metamarkets Group Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package io.druid.storage.s3;

import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AWSCredentialsProvider;
import com.amazonaws.auth.AWSSessionCredentials;
import com.google.common.util.concurrent.ThreadFactoryBuilder;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

public class FileSessionCredentialsProvider implements AWSCredentialsProvider {
    private final String sessionCredentials;
    private volatile String sessionToken;
    private volatile String accessKey;
    private volatile String secretKey;

    private final ScheduledExecutorService scheduler = Executors
            .newSingleThreadScheduledExecutor(new ThreadFactoryBuilder()
                    .setNameFormat("FileSessionCredentialsProviderRefresh-%d").setDaemon(true).build());

    public FileSessionCredentialsProvider(String sessionCredentials) {
        this.sessionCredentials = sessionCredentials;
        refresh();

        scheduler.scheduleAtFixedRate(new Runnable() {
            @Override
            public void run() {
                refresh();
            }
        }, 1, 1, TimeUnit.HOURS); // refresh every hour
    }

    @Override
    public AWSCredentials getCredentials() {
        return new AWSSessionCredentials() {
            @Override
            public String getSessionToken() {
                return sessionToken;
            }

            @Override
            public String getAWSAccessKeyId() {
                return accessKey;
            }

            @Override
            public String getAWSSecretKey() {
                return secretKey;
            }
        };
    }

    @Override
    public void refresh() {
        try {
            Properties props = new Properties();
            InputStream is = new FileInputStream(new File(sessionCredentials));
            props.load(is);
            is.close();

            sessionToken = props.getProperty("sessionToken");
            accessKey = props.getProperty("accessKey");
            secretKey = props.getProperty("secretKey");
        } catch (IOException e) {
            throw new RuntimeException("cannot refresh AWS credentials", e);
        }
    }
}