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var aws = require('aws-sdk'), | |
Promise = require('bluebird'), | |
chalk = require('chalk'), | |
messageFactory = require('./factory'), | |
config = require('./config.json'); | |
var sqs = new Promise.promisifyAll(new aws.SQS({ | |
region: config.aws.region, | |
accessKeyId: config.aws.accessId, | |
secretAccessKey: config.aws.secretKey, | |
params: { | |
QueueUrl: config.aws.queueUrl | |
} | |
})); | |
(function pollQueueForMessages() { | |
console.log(chalk.yellow("Starting long-poll operation.")); | |
Promise.try(function() { | |
return sqs.receiveMessageAsync({ | |
WaitTimeSeconds: 20, | |
VisibilityTimeout: 10 | |
}); | |
}).then(function handleMessageResolve(data) { | |
var payload, message; | |
if(!data.Messages) { | |
throw workflowError("EmptyQueue", new Error("No messages to process")); | |
} | |
payload = JSON.parse(data.Messages[0].Body); | |
message = new messageFactory(data); | |
return Promise.try(function() { | |
return message.sendMessageAsync(data); | |
}).then(function() { | |
return sqs.deleteMessageAsync({ | |
ReceiptHandle: data.Messages[0].ReceiptHandle | |
}); | |
}).then(function handleDeleteResolve(data) { | |
console.log(chalk.green("Message deleted.")); | |
}).catch( | |
function handleError(error) { | |
switch (error.type) { | |
case "EmptyQueue": | |
console.log( chalk.cyan( "Expected Error:", error.message ) ); | |
break; | |
default: | |
console.log( chalk.red( "Unexpected Error:", error ) ); | |
break; | |
} | |
} | |
).finally(pollQueueForMessages); | |
})(); | |
function workflowError(type, error) { | |
error.type = type; | |
return(error); | |
} | |
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