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'use strict'
const DEFAULT_OPTIONS = {
workerOptions : {}
, maxCallsPerWorker : Infinity
, maxConcurrentWorkers : (require('os').cpus() || { length: 1 }).length
, maxConcurrentCallsPerWorker : 10
, maxConcurrentCalls : Infinity
, maxCallTime : Infinity // exceed this and the whole worker is terminated
, maxRetries : Infinity
, forcedKillTime : 100
, autoStart : false
, onChild : function() {}
}
const fork = require('./fork')
, TimeoutError = require('errno').create('TimeoutError')
, ProcessTerminatedError = require('errno').create('ProcessTerminatedError')
, MaxConcurrentCallsError = require('errno').create('MaxConcurrentCallsError')
function Farm (options, path) {
this.options = Object.assign({}, DEFAULT_OPTIONS, options)
this.path = path
this.activeCalls = 0
}
// make a handle to pass back in the form of an external API
Farm.prototype.mkhandle = function (method) {
return function () {
let args = Array.prototype.slice.call(arguments)
if (this.activeCalls + this.callQueue.length >= this.options.maxConcurrentCalls) {
let err = new MaxConcurrentCallsError('Too many concurrent calls (active: ' + this.activeCalls + ', queued: ' + this.callQueue.length + ')')
if (typeof args[args.length - 1] == 'function')
return process.nextTick(args[args.length - 1].bind(null, err))
throw err
}
this.addCall({
method : method
, callback : args.pop()
, args : args
, retries : 0
})
}.bind(this)
}
// a constructor of sorts
Farm.prototype.setup = function (methods) {
let iface
if (!methods) { // single-function export
iface = this.mkhandle()
} else { // multiple functions on the export
iface = {}
methods.forEach(function (m) {
iface[m] = this.mkhandle(m)
}.bind(this))
}
this.searchStart = -1
this.childId = -1
this.children = {}
this.activeChildren = 0
this.callQueue = []
if (this.options.autoStart) {
while (this.activeChildren < this.options.maxConcurrentWorkers)
this.startChild()
}
return iface
}
// when a child exits, check if there are any outstanding jobs and requeue them
Farm.prototype.onExit = function (childId) {
// delay this to give any sends a chance to finish
setTimeout(function () {
let doQueue = false
if (this.children[childId] && this.children[childId].activeCalls) {
this.children[childId].calls.forEach(function (call, i) {
if (!call) return
else if (call.retries >= this.options.maxRetries) {
this.receive({
idx : i
, child : childId
, args : [ new ProcessTerminatedError('cancel after ' + call.retries + ' retries!') ]
})
} else {
call.retries++
this.callQueue.unshift(call)
doQueue = true
}
}.bind(this))
}
this.stopChild(childId)
doQueue && this.processQueue()
}.bind(this), 10)
}
// start a new worker
Farm.prototype.startChild = function () {
this.childId++
let forked = fork(this.path, this.options.workerOptions)
, id = this.childId
, c = {
send : forked.send
, child : forked.child
, calls : []
, activeCalls : 0
, exitCode : null
}
this.options.onChild(forked.child);
forked.child.on('message', function(data) {
if (data.owner !== 'farm') {
return;
}
this.receive(data);
}.bind(this))
forked.child.once('exit', function (code) {
c.exitCode = code
this.onExit(id)
}.bind(this))
this.activeChildren++
this.children[id] = c
}
// stop a worker, identified by id
Farm.prototype.stopChild = function (childId) {
let child = this.children[childId]
if (child) {
child.send({owner: 'farm', event: 'die'})
setTimeout(function () {
if (child.exitCode === null)
child.child.kill('SIGKILL')
}, this.options.forcedKillTime).unref()
;delete this.children[childId]
this.activeChildren--
}
}
// called from a child process, the data contains information needed to
// look up the child and the original call so we can invoke the callback
Farm.prototype.receive = function (data) {
let idx = data.idx
, childId = data.child
, args = data.args
, child = this.children[childId]
, call
if (!child) {
return console.error(
'Worker Farm: Received message for unknown child. '
+ 'This is likely as a result of premature child death, '
+ 'the operation will have been re-queued.'
)
}
call = child.calls[idx]
if (!call) {
return console.error(
'Worker Farm: Received message for unknown index for existing child. '
+ 'This should not happen!'
)
}
if (this.options.maxCallTime !== Infinity)
clearTimeout(call.timer)
if (args[0] && args[0].$error == '$error') {
let e = args[0]
switch (e.type) {
case 'TypeError': args[0] = new TypeError(e.message); break
case 'RangeError': args[0] = new RangeError(e.message); break
case 'EvalError': args[0] = new EvalError(e.message); break
case 'ReferenceError': args[0] = new ReferenceError(e.message); break
case 'SyntaxError': args[0] = new SyntaxError(e.message); break
case 'URIError': args[0] = new URIError(e.message); break
default: args[0] = new Error(e.message)
}
args[0].type = e.type
args[0].stack = e.stack
// Copy any custom properties to pass it on.
Object.keys(e).forEach(function(key) {
args[0][key] = e[key];
});
}
process.nextTick(function () {
call.callback.apply(null, args)
})
;delete child.calls[idx]
child.activeCalls--
this.activeCalls--
if (child.calls.length >= this.options.maxCallsPerWorker
&& !Object.keys(child.calls).length) {
// this child has finished its run, kill it
this.stopChild(childId)
}
// allow any outstanding calls to be processed
this.processQueue()
}
Farm.prototype.childTimeout = function (childId) {
let child = this.children[childId]
, i
if (!child)
return
for (i in child.calls) {
this.receive({
idx : i
, child : childId
, args : [ new TimeoutError('worker call timed out!') ]
})
}
this.stopChild(childId)
}
// send a call to a worker, identified by id
Farm.prototype.send = function (childId, call) {
let child = this.children[childId]
, idx = child.calls.length
child.calls.push(call)
child.activeCalls++
this.activeCalls++
child.send({
owner : 'farm'
, idx : idx
, child : childId
, method : call.method
, args : call.args
})
if (this.options.maxCallTime !== Infinity) {
call.timer =
setTimeout(this.childTimeout.bind(this, childId), this.options.maxCallTime)
}
}
// a list of active worker ids, in order, but the starting offset is
// shifted each time this method is called, so we work our way through
// all workers when handing out jobs
Farm.prototype.childKeys = function () {
let cka = Object.keys(this.children)
, cks
if (this.searchStart >= cka.length - 1)
this.searchStart = 0
else
this.searchStart++
cks = cka.splice(0, this.searchStart)
return cka.concat(cks)
}
// Calls are added to a queue, this processes the queue and is called
// whenever there might be a chance to send more calls to the workers.
// The various options all impact on when we're able to send calls,
// they may need to be kept in a queue until a worker is ready.
Farm.prototype.processQueue = function () {
let cka, i = 0, childId
if (!this.callQueue.length)
return this.ending && this.end()
if (this.activeChildren < this.options.maxConcurrentWorkers)
this.startChild()
for (cka = this.childKeys(); i < cka.length; i++) {
childId = +cka[i]
if (this.children[childId].activeCalls < this.options.maxConcurrentCallsPerWorker
&& this.children[childId].calls.length < this.options.maxCallsPerWorker) {
this.send(childId, this.callQueue.shift())
if (!this.callQueue.length)
return this.ending && this.end()
} /*else {
console.log(
, this.children[childId].activeCalls < this.options.maxConcurrentCallsPerWorker
, this.children[childId].calls.length < this.options.maxCallsPerWorker
, this.children[childId].calls.length , this.options.maxCallsPerWorker)
}*/
}
if (this.ending)
this.end()
}
// add a new call to the call queue, then trigger a process of the queue
Farm.prototype.addCall = function (call) {
if (this.ending)
return this.end() // don't add anything new to the queue
this.callQueue.push(call)
this.processQueue()
}
// kills child workers when they're all done
Farm.prototype.end = function (callback) {
let complete = true
if (this.ending === false)
return
if (callback)
this.ending = callback
else if (this.ending == null)
this.ending = true
Object.keys(this.children).forEach(function (child) {
if (!this.children[child])
return
if (!this.children[child].activeCalls)
this.stopChild(child)
else
complete = false
}.bind(this))
if (complete && typeof this.ending == 'function') {
process.nextTick(function () {
this.ending()
this.ending = false
}.bind(this))
}
}
module.exports = Farm
module.exports.TimeoutError = TimeoutError