sql-streaming-sqs/src/main/java/org/apache/spark/sql/streaming/sqs/InstanceProfileCredentialsProviderWithRetries.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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 org.apache.spark.sql.streaming.sqs;


import com.amazonaws.AmazonClientException;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.InstanceProfileCredentialsProvider;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class InstanceProfileCredentialsProviderWithRetries
        extends InstanceProfileCredentialsProvider {

    private static final Log LOG = LogFactory.getLog(
            InstanceProfileCredentialsProviderWithRetries.class);

    public AWSCredentials getCredentials() {
        int retries = 10;
        int sleep = 500;
        while(retries > 0) {
            try {
                return super.getCredentials();
            }
            catch (RuntimeException re) {
                LOG.error("Got an exception while fetching credentials " + re);
                --retries;
                try {
                    Thread.sleep(sleep);
                } catch (InterruptedException ie) {
                    // Do nothing
                }
                if (sleep < 10000) {
                    sleep *= 2;
                }
            }
            catch (Error error) {
                LOG.error("Got an exception while fetching credentials " + error);
                --retries;
                try {
                    Thread.sleep(sleep);
                } catch (InterruptedException ie) {
                    // Do nothing
                }
                if (sleep < 10000) {
                    sleep *= 2;
                }
            }
        }
        throw new AmazonClientException("Unable to load credentials.");
    }
}