/*
* Copyright 2012 Amazon Technologies, 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://aws.amazon.com/apache2.0
*
* This file 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 com.amazonaws.services.glacier.transfer;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.amazonaws.AmazonClientException;
import com.amazonaws.ClientConfiguration;
import com.amazonaws.auth.AWSCredentialsProvider;
import com.amazonaws.auth.policy.Policy;
import com.amazonaws.auth.policy.Principal;
import com.amazonaws.auth.policy.Resource;
import com.amazonaws.auth.policy.Statement;
import com.amazonaws.auth.policy.Statement.Effect;
import com.amazonaws.auth.policy.actions.SQSActions;
import com.amazonaws.auth.policy.conditions.ConditionFactory;
import com.amazonaws.services.glacier.model.StatusCode;
import com.amazonaws.services.sns.AmazonSNSClient;
import com.amazonaws.services.sns.model.CreateTopicRequest;
import com.amazonaws.services.sns.model.DeleteTopicRequest;
import com.amazonaws.services.sns.model.SubscribeRequest;
import com.amazonaws.services.sqs.AmazonSQSClient;
import com.amazonaws.services.sqs.model.CreateQueueRequest;
import com.amazonaws.services.sqs.model.DeleteMessageRequest;
import com.amazonaws.services.sqs.model.DeleteQueueRequest;
import com.amazonaws.services.sqs.model.GetQueueAttributesRequest;
import com.amazonaws.services.sqs.model.Message;
import com.amazonaws.services.sqs.model.ReceiveMessageRequest;
import com.amazonaws.services.sqs.model.SetQueueAttributesRequest;
import com.amazonaws.util.BinaryUtils;
import com.amazonaws.util.json.JSONException;
import com.amazonaws.util.json.JSONObject;
/**
* Utility for monitoring the status of an Amazon Glacier job, through Amazon
* SNS/SQS.
*/
public class JobStatusMonitor {
private AmazonSQSClient sqs;
private AmazonSNSClient sns;
private String queueUrl;
private String topicArn;
private static final Log log = LogFactory.getLog(JobStatusMonitor.class);
public JobStatusMonitor(AWSCredentialsProvider credentialsProvider, ClientConfiguration clientConfiguration) {
sqs = new AmazonSQSClient(credentialsProvider, clientConfiguration);
sns = new AmazonSNSClient(credentialsProvider, clientConfiguration);
setupQueueAndTopic();
}
/**
* Constructs a JobStatusMonitor that will use the specified clients for
* polling archive download job status.
*
* @param sqs
* The client for working with Amazon SQS when polling archive
* retrieval job status.
* @param sns
* The client for working with Amazon SNS when polling archive
* retrieval job status.
*/
public JobStatusMonitor(AmazonSQSClient sqs, AmazonSNSClient sns) {
this.sqs = sqs;
this.sns = sns;
setupQueueAndTopic();
}
public String getTopicArn() {
return topicArn;
}
public void shutdown() {
try {
sqs.deleteQueue(new DeleteQueueRequest(queueUrl));
} catch (Exception e) {
log.warn("Unable to delete queue: " + queueUrl, e);
}
try {
sns.deleteTopic(new DeleteTopicRequest(topicArn));
} catch (Exception e) {
log.warn("Unable to delete topic: " + topicArn, e);
}
}
// Poll the SQS queue to see if we've received a message about the job completion yet
public void waitForJobToComplete(String jobId) {
while (true) {
List<Message> messages = sqs.receiveMessage(new ReceiveMessageRequest(queueUrl)).getMessages();
for (Message message : messages) {
String messageBody = message.getBody();
if (!messageBody.startsWith("{")) {
messageBody = new String(BinaryUtils.fromBase64(messageBody));
}
try {
JSONObject json = new JSONObject(messageBody);
String jsonMessage = json.getString("Message").replace("\\\"", "\"");
json = new JSONObject(jsonMessage);
String messageJobId = json.getString("JobId");
String messageStatus = json.getString("StatusMessage");
// Don't process this message if it wasn't the job we were looking for
if (!jobId.equals(messageJobId)) continue;
try {
if (StatusCode.Succeeded.toString().equals(messageStatus)) return;
if (StatusCode.Failed.toString().equals(messageStatus)) {
throw new AmazonClientException("Archive retrieval failed");
}
} finally {
deleteMessage(message);
}
} catch (JSONException e) {
throw new AmazonClientException("Unable to parse status message: " + messageBody, e);
}
}
sleep(1000 * 30);
}
}
private void sleep(long milliseconds) {
try {
Thread.sleep(milliseconds);
} catch (InterruptedException ie) {
throw new AmazonClientException("Archive download interrupted", ie);
}
}
private void deleteMessage(Message message) {
try {
sqs.deleteMessage(new DeleteMessageRequest(queueUrl, message.getReceiptHandle()));
} catch (Exception e) {}
}
private void setupQueueAndTopic() {
String queueName = "glacier-archive-transfer-" + System.currentTimeMillis();
String topicName = "glacier-archive-transfer-" + System.currentTimeMillis();
queueUrl = sqs.createQueue(new CreateQueueRequest(queueName)).getQueueUrl();
topicArn = sns.createTopic(new CreateTopicRequest(topicName)).getTopicArn();
String queueARN = sqs.getQueueAttributes(new GetQueueAttributesRequest(queueUrl).withAttributeNames("QueueArn")).getAttributes().get("QueueArn");
Policy sqsPolicy =
new Policy().withStatements(
new Statement(Effect.Allow)
.withPrincipals(Principal.AllUsers)
.withActions(SQSActions.SendMessage)
.withResources(new Resource(queueARN))
.withConditions(ConditionFactory.newSourceArnCondition(topicArn)));
sqs.setQueueAttributes(new SetQueueAttributesRequest(queueUrl, newAttributes("Policy", sqsPolicy.toJson())));
sns.subscribe(new SubscribeRequest(topicArn, "sqs", queueARN));
}
private Map<String, String> newAttributes(String... keyValuePairs) {
if (keyValuePairs.length % 2 != 0)
throw new IllegalArgumentException("Incorrect number of arguments passed. Input must be specified as: key, value, key, value, ...");
Map<String, String> map = new HashMap<String, String>();
for (int i = 0; i < keyValuePairs.length; i += 2) {
String key = keyValuePairs[i];
String value = keyValuePairs[i+1];
map.put(key, value);
}
return map;
}
}