275 lines
7.9 KiB
JavaScript
275 lines
7.9 KiB
JavaScript
'use strict';
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var jsonfile = require('jsonfile');
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var lxc = require('../lxc');
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var doapi = require('../doapi')();
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var settings = require('./workers.json');
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var tagPrefix = settings.tagPrefix || 'clwV';
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var workers = (function(){
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// works array constructor. This will hold the works(order by creation) and all
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// the methods interacting with the workers.
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// base array that will be the workers objects.
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var workers = [];
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// persistent settings object
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// .image is the currently used Digital Ocean snap shot ID
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// .lastSnapShotId is the previous ID used Digital Ocean snap shot
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// .version is the current worker version
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// .size is the base Droplet size for worker creation
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// .min is the minimum amount of workers that should exist
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// .max is the maximum amount of works that ca exist
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// .minAvail is the amount of empty workers there should be
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workers.settings = settings;
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// How many droplets are currently in the process of being created. It takes
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// about 3 minutes to create a worker.
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workers.currentCreating = 0;
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workers.create = function(){
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// manages the creation of a work from first call to all runners seeded
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// dont create more workers then the settings file allows
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if(workers.currentCreating > workers.settings.max ) return false;
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workers.currentCreating++;
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doapi.dropletToActive({
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name: 'clw'+workers.settings.version+'-'+(Math.random()*100).toString().slice(-4),
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image: workers.settings.image,
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size: workers.settings.size,
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onCreate: function(data){
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doapi.dropletSetTag(tagPrefix+workers.settings.version, data.droplet.id);
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},
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onActive: function(worker, args){
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workers.startRunners({
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worker: workers.makeWorkerObj(worker),
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onStart: function(runner, args){
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workers.push(args.worker);
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doapi.domianAddRecord({
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domain: "codeland.us",
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type: "A",
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name: "*."+worker.name+".workers",
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data: worker.publicIP
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});
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args.onStart = function(){};
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},
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onDone: function(args){
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console.log("Seeded runners on", worker.name);
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workers.currentCreating--;
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}
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});
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}
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});
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};
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workers.makeWorkerObj = function(worker){
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// Create object for each worker.
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worker.networks.v4.forEach(function(value){
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worker[value.type+'IP'] = value.ip_address;
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});
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worker.availrunners = [];
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worker.ip = worker.publicIP;
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worker.usedrunners = 0;
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worker.index = workers.length;
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worker.getRunner = function(){
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if(this.availrunners.length === 0) return false;
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// console.log('getting runner from ', worker.name, ' avail length ', this.availrunners.length);
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var runner = this.availrunners.pop();
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this.usedrunners++;
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runnerTimeout(runner);
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return runner;
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}
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return worker;
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};
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workers.__workersId = function(argument){
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// create array of all current worker Digital Ocean ID
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return workers.map(function(item){
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return item.id;
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});
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};
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workers.destroy = function(worker){
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// todo: If worker is passed, check for it in the workers array and
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// remove it if found.
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var worker = worker || workers.pop();
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return doapi.dropletDestroy(worker.id, function(body) {
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console.log('Deleted worker', worker.name);
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});
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};
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workers.destroyByTag = function(tag){
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// Delete works that with
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tag = tag || tagPrefix + workers.settings.version;
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let currentIDs = workers.__workersId();
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let deleteDroplets = function(droplets){
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if(droplets.length === 0) return true;
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let droplet = droplets.pop();
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if(~currentIDs.indexOf(droplet.id)) return deleteDroplets(droplets);
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doapi.dropletDestroy(droplet.id, function(body){
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setTimeout(deleteDroplets, 1000, droplets);
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if(!droplets.length) console.log(`Finished deleting workers tagged ${tag}.`);
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});
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}
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doapi.dropletsByTag(tag, function(data){
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data = JSON.parse(data);
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console.log(`Deleting ${data['droplets'].length} workers tagged ${tag}. Workers`,
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data['droplets'].map(function(item){
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return item.name+' | '+item.id;
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})
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);
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deleteDroplets(data['droplets']);
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});
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};
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workers.startRunners = function(args){
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// console.log('starting runners on', args.worker.name, args.worker.ip)
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// dont make runners on out dated workers
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if(!args.worker || workers.settings.image > args.worker.image.id){
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console.log(`Blocked outdated worker(${args.worker.image.id}), current image ${workers.settings.image}.`)
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return ;
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}
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// percent of used RAM to stop runner creation
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args.stopPercent = args.stopPercent || 80;
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args.onStart = args.onStart || function(){};
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args.onDone = args.onDone || function(){};
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ramPercentUsed(args.worker.ip, function(usedMemPercent){
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if(usedMemPercent > args.stopPercent ){
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console.log('using', String(usedMemPercent).trim(),
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'percent memory, stopping runner creation!', args.worker.availrunners.length,
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'created on ', args.worker.name
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);
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args.onDone(args);
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return ;
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}
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var name = 'crunner-'+(Math.random()*100).toString().slice(-4);
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// console.log('Free ram check passed!')
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lxc.startEphemeral(name, 'crunner0', args.worker.ip, function(data){
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if(!data.ip) return setTimeout(workers.startRunners, 0, args);
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// console.log('started runner on', args.worker.name)
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var runner = {
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ip: data.ip,
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name: name,
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worker: args.worker,
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label: args.worker.name + ':' + name
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};
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args.onStart(runner, args);
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args.worker.availrunners.push(runner);
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setTimeout(workers.startRunners, 0, args);
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});
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});
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};
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workers.checkForZombies = function(){
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// check to make sure all works are used or usable.
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let zombies = 0;
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for(let worker of workers){
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console.log(`Checking if ${worker.name} is a zombie worker.`);
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// if a runner has no available runners and no used runners, its a
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// zombie. This should happen when a newer image ID has been added
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// and old workers slowly lose there usefulness.
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if(worker.availrunners.length === 0 && worker.usedrunners === 0){
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workers.splice(workers.indexOf(worker), 1);
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console.log(`Zombie! Worker ${worker.name}, destroying.`);
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workers.destroy(worker);
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zombies++;
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}
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}
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return zombies;
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};
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workers.checkBalance = function(){
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console.log(`Checking balance.`);
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workers.checkForZombies();
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// if there are workers being created, stop scale up and down check
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if(workers.currentCreating+workers.length < workers.settings.min) null;
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else if(workers.currentCreating)
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return console.log(`Killing balance, workers are being created.`);
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// hold amount of workers with no used runners
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var lastMinAval = 0;
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// check to make sure the `workers.settings.minAvail` have free runners
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for(let worker of workers.slice(-workers.settings.minAvail)){
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if(worker.usedrunners === 0){
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lastMinAval++;
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}else{
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// no need to keep counting, workers need to be created
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break;
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}
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}
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if(lastMinAval > workers.settings.minAvail){
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// Remove workers if there are more then the settings states
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console.log(
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`Last ${workers.settings.minAvail} workers not used, killing last worker`,
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'lastMinAval:', lastMinAval,
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'minAvail:', workers.settings.minAvail,
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'workers:', workers.length
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);
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return workers.destroy();
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} else if(lastMinAval < workers.settings.minAvail){
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// creates workers if the settings file demands it
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console.log(
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'last 3 workers have no free runners, starting worker',
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'lastMinAval:', lastMinAval,
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'minAvail:', workers.settings.minAvail,
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'workers:', workers.length
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);
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return workers.create();
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}
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};
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workers.settingsSave = function(){
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// save the live settings file to disk
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jsonfile.writeFile('./workers.json', workers.settings, {spaces: 2}, function(err) {
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console.error(err);
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});
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};
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workers.add = function(newWorkers){
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newWorkers.forEach(function(worker){
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workers.push(worker);
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});
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};
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// make sure Digital Ocean has a tag for the current worker version
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doapi.tagCreate(tagPrefix+workers.settings.version);
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return workers;
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})();
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module.exports = workers; |