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sqs.js
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sqs.js
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var helper = require('./helper'),
Q = require('q');
var SQS = new helper.AWS.SQS(),
QUEUE_NAME = 'CS553',
TASK_LIST = [];
// NOTE : Get SQS Queue URL
function getQueueUrl(queueName, callback) {
var deferred = Q.defer();
var params = {
QueueName: queueName
};
SQS.getQueueUrl(params, function (err, data) {
if (err)
deferred.reject("ERROR : getQueueUrl() : " + err + err.stack);
else
deferred.resolve(data.QueueUrl);
});
return deferred.promise.nodeify(callback);
};
// NOTE : delete message on SQS queue (client) after reading the message
function deleteMessage(queueUrl, receiptHandle, callback) {
var deferred = Q.defer();
var params = {
QueueUrl: queueUrl,
/* required */
ReceiptHandle: receiptHandle /* required */
};
SQS.deleteMessage(params, function (err, data) {
if (err) deferred.reject("ERROR: deleteMessage() : " + err + err.stack);
else deferred.resolve(data);
});
return deferred.promise.nodeify(callback);
};
// NOTE: Create SQS Queue
exports.createQueue = function (queueName, callback) {
var deferred = Q.defer();
var params = {
QueueName: queueName
/* required */
};
SQS.createQueue(params, function (err, data) {
if (err) deferred.reject("ERROR: createQueue() : " + err + err.stack);
else deferred.resolve(data);
});
return deferred.promise.nodeify(callback);
};
// NOTE : Send message to SQS Queue; Returns 'MessageId'
exports.sendMessage = function (queueName, messageAttributes, message, callback) {
var deferred = Q.defer(),
queueName = queueName || QUEUE_NAME; //NOTE: use master queue for messaged from scheduler
var params = {
MessageBody: message,
/* required */
QueueUrl: '',
/* required */
DelaySeconds: 0,
MessageAttributes: messageAttributes
};
getQueueUrl(queueName).then(function (queueUrl) {
params.QueueUrl = queueUrl;
SQS.sendMessage(params, function (err, data) {
if (err) deferred.reject("ERROR: sendMessage() : " + err + err.stack);
else {
TASK_LIST.push(data.MessageId); // NOTE: MessageId being used as TaskId
deferred.resolve(data.MessageId);
}
});
}, function (error) {
deferred.reject(error);
});
return deferred.promise.nodeify(callback);
};
// NOTE : Receive message from SQS queue (client)
exports.receiveMessage = function (queueName, messageAttributes, callback) {
var deferred = Q.defer(),
queueName = queueName || QUEUE_NAME;
//console.log("Fetching messages from Queue : ", queueName);
var params = {
QueueUrl: '',
/* required */
AttributeNames: [
'Policy | VisibilityTimeout | MaximumMessageSize | MessageRetentionPeriod | ApproximateNumberOfMessages | ApproximateNumberOfMessagesNotVisible | CreatedTimestamp | LastModifiedTimestamp | QueueArn | ApproximateNumberOfMessagesDelayed | DelaySeconds | ReceiveMessageWaitTimeSeconds | RedrivePolicy'
],
MaxNumberOfMessages: 10,
MessageAttributeNames: messageAttributes,
VisibilityTimeout: 1,
WaitTimeSeconds: 1
};
getQueueUrl(queueName).then(function (queueUrl) {
params.QueueUrl = queueUrl;
SQS.receiveMessage(params, function (err, data) {
if (err) deferred.reject("ERROR: receiveMessage() : " + err + err.stack);
else {
if (data.Messages && data.Messages.length > 0) {
data.Messages.forEach(function (msg, i) {
deleteMessage(params.QueueUrl, msg.ReceiptHandle).then(function (data) {
console.log("Successfully deleted message : ", data);
});
});
}
deferred.resolve(data);
}
});
}, function (error) {
deferred.reject(error);
});
return deferred.promise.nodeify(callback);
};
// NOTE: Delete SQS Queue
exports.deleteQueue = function (queueName, callback) {
var deferred = Q.defer();
var params = {
QueueUrl: ''
/* required */
};
getQueueUrl(queueName).then(function (queueUrl) {
params.QueueUrl = queueUrl;
SQS.deleteQueue(params, function (err, data) {
if (err) deferred.reject("ERROR: deleteQueue() : " + err + err.stack);
else deferred.resolve(data);
});
}, function (error) {
deferred.reject(error);
});
return deferred.promise.nodeify(callback);
};
// NOTE: Get queueLength of a given queueName
exports.getQueueLength = function (queueName, callback) {
var deferred = Q.defer();
var params = {
QueueUrl: '',
/* required */
AttributeNames: ['ApproximateNumberOfMessages']
};
getQueueUrl(queueName).then(function (queueUrl) {
params.QueueUrl = queueUrl;
SQS.getQueueAttributes(params, function (err, data) {
if (err) deferred.reject("ERROR : getQueueLength() : " + err + err.stack);
else deferred.resolve(data.Attributes.ApproximateNumberOfMessages);
});
}, function (error) {
deferred.reject(error);
});
return deferred.promise.nodeify(callback);
};
// NOTE: Print Task List
exports.printTaskList = function () {
console.log("=======================================================");
console.log("TASK LIST (" + TASK_LIST.length + " tasks) :");
console.log("=======================================================");
TASK_LIST.forEach(function (taskId, i) {
console.log("Task " + (i + 1) + " : ", taskId);
});
console.log("=======================================================");
};