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client.js
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client.js
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var fs = require('fs'),
Q = require('q'),
io = require('socket.io-client'),
_ = require('underscore'),
SQS = require('./sqs');
var argv = require('optimist')
.usage('Usage: $0 -s [IP_ADDRESS]:[PORT] -w [WORKLOAD_FILE]')
.demand(['s', 'w'])
.alias('s', 'scheduler')
.describe('s', 'Task Scheduler')
.alias('w', 'workload')
.describe('w', 'Workload File')
.argv;
var schedulerAddress, startTime, endTime;
if (validateAddress(argv.scheduler)) {
schedulerAddress = "http://" + argv.scheduler;
} else {
console.log("Please enter a valid IP address and port ! : [IP_ADDRESS]:[PORT] => ", argv.scheduler);
process.exit();
}
var socket = io(schedulerAddress),
TASK_LIST = [];
if (!fs.existsSync(argv.workload)) {
console.log("File does not exist ! : " + argv.workload);
process.exit();
}
socket.on('connect', function () {
console.log("Connected to Scheduler @ ", socket.io.uri);
socket.on('disconnect', function () {
console.log("Scheduler went down ! Sorry, I am going down too !");
TASK_LIST.length = 0;
process.exit();
});
socket.on('taskSubmit', function (taskId) {
TASK_LIST.push(taskId);
console.log("Received taskId : ", taskId);
});
socket.on('taskResult', function (taskResult) {
if (taskResult.Messages && taskResult.Messages.length > 0) {
taskResult.Messages.forEach(function (task, i) {
if (_.contains(TASK_LIST, task.MessageAttributes.taskId.StringValue)) {
console.log("=======TASK-ID:" + task.MessageAttributes.taskId.StringValue + "=======");
console.log("Task Result : ", task.Body);
console.log("==========================================================");
TASK_LIST = _.without(TASK_LIST, task.MessageAttributes.taskId.StringValue);
if (TASK_LIST.length == 0) {
endTime = Date.now();
console.log("Successfully processed all tasks in " + (endTime - startTime) / 1000 + " seconds !");
process.exit();
}
} else {
console.log("CAUTION : Received task result which does not belong to me !", task);
}
});
}
});
socket.on('READY', function () {
// NOTE: Read workload file
fs.readFile(argv.workload, function (err, data) {
var buffer = new Buffer(data),
tasks = buffer.toString().split('\n');
startTime = Date.now();
// NOTE: Submit tasks to scheduler
tasks.forEach(function (task) {
submitTask(task);
});
});
});
});
function submitTask(task) {
socket.emit('taskSubmit', task);
}
// NOTE: check if address is valid (ip:port)
function validateAddress(entry) {
var ip_port = entry.split(":");
var blocks = ip_port[0].split(".");
if (ip_port.length < 2)
return false;
if(blocks.length === 4) {
return blocks.every(function(block) {
return parseInt(block,10) >=0 && parseInt(block,10) <= 255;
});
}
return false;
}
process.on("SIGINT", function () {
console.log('Exiting Client !');
endTime = Date.now();
console.log("Successfully processed all tasks in " + (endTime - startTime) / 1000 + " seconds !");
process.exit();
});
/*// NOTE: Read workload file
fs.readFile('./workload.txt', function (err, data) {
var buffer = new Buffer(data),
tasks = buffer.toString().split('\n');
var promises = [];
// NOTE: Send SQS message for each task
tasks.forEach(function (task) {
promises.push(SQS.sendMessage(task));
});
Q.all(promises).then(function (tasks) {
console.log("Messages Sent !\n", tasks);
SQS.printTaskList();
}, console.error);
// NOTE: Open socket connection to server and keep waiting
// Divide this app into client and scheduler
});*/