372 lines
9.9 KiB
JavaScript
372 lines
9.9 KiB
JavaScript
'use strict';
|
|
|
|
Object.defineProperty(exports, "__esModule", {
|
|
value: true
|
|
});
|
|
|
|
var _child_process = require('child_process');
|
|
|
|
var _child_process2 = _interopRequireDefault(_child_process);
|
|
|
|
var _queue = require('neo-async/queue');
|
|
|
|
var _queue2 = _interopRequireDefault(_queue);
|
|
|
|
var _mapSeries = require('neo-async/mapSeries');
|
|
|
|
var _mapSeries2 = _interopRequireDefault(_mapSeries);
|
|
|
|
var _readBuffer = require('./readBuffer');
|
|
|
|
var _readBuffer2 = _interopRequireDefault(_readBuffer);
|
|
|
|
var _WorkerError = require('./WorkerError');
|
|
|
|
var _WorkerError2 = _interopRequireDefault(_WorkerError);
|
|
|
|
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
|
|
|
|
const workerPath = require.resolve('./worker'); /* eslint-disable no-console */
|
|
|
|
let workerId = 0;
|
|
|
|
class PoolWorker {
|
|
constructor(options, onJobDone) {
|
|
this.disposed = false;
|
|
this.nextJobId = 0;
|
|
this.jobs = Object.create(null);
|
|
this.activeJobs = 0;
|
|
this.onJobDone = onJobDone;
|
|
this.id = workerId;
|
|
workerId += 1;
|
|
this.worker = _child_process2.default.spawn(process.execPath, [].concat(options.nodeArgs || []).concat(workerPath, options.parallelJobs), {
|
|
detached: true,
|
|
stdio: ['ignore', 'pipe', 'pipe', 'pipe', 'pipe']
|
|
});
|
|
|
|
this.worker.unref();
|
|
|
|
// This prevents a problem where the worker stdio can be undefined
|
|
// when the kernel hits the limit of open files.
|
|
// More info can be found on: https://github.com/webpack-contrib/thread-loader/issues/2
|
|
if (!this.worker.stdio) {
|
|
throw new Error(`Failed to create the worker pool with workerId: ${workerId} and ${''}configuration: ${JSON.stringify(options)}. Please verify if you hit the OS open files limit.`);
|
|
}
|
|
|
|
const [,,, readPipe, writePipe] = this.worker.stdio;
|
|
this.readPipe = readPipe;
|
|
this.writePipe = writePipe;
|
|
this.listenStdOutAndErrFromWorker(this.worker.stdout, this.worker.stderr);
|
|
this.readNextMessage();
|
|
}
|
|
|
|
listenStdOutAndErrFromWorker(workerStdout, workerStderr) {
|
|
if (workerStdout) {
|
|
workerStdout.on('data', this.writeToStdout);
|
|
}
|
|
|
|
if (workerStderr) {
|
|
workerStderr.on('data', this.writeToStderr);
|
|
}
|
|
}
|
|
|
|
ignoreStdOutAndErrFromWorker(workerStdout, workerStderr) {
|
|
if (workerStdout) {
|
|
workerStdout.removeListener('data', this.writeToStdout);
|
|
}
|
|
|
|
if (workerStderr) {
|
|
workerStderr.removeListener('data', this.writeToStderr);
|
|
}
|
|
}
|
|
|
|
writeToStdout(data) {
|
|
if (!this.disposed) {
|
|
process.stdout.write(data);
|
|
}
|
|
}
|
|
|
|
writeToStderr(data) {
|
|
if (!this.disposed) {
|
|
process.stderr.write(data);
|
|
}
|
|
}
|
|
|
|
run(data, callback) {
|
|
const jobId = this.nextJobId;
|
|
this.nextJobId += 1;
|
|
this.jobs[jobId] = { data, callback };
|
|
this.activeJobs += 1;
|
|
this.writeJson({
|
|
type: 'job',
|
|
id: jobId,
|
|
data
|
|
});
|
|
}
|
|
|
|
warmup(requires) {
|
|
this.writeJson({
|
|
type: 'warmup',
|
|
requires
|
|
});
|
|
}
|
|
|
|
writeJson(data) {
|
|
const lengthBuffer = Buffer.alloc(4);
|
|
const messageBuffer = Buffer.from(JSON.stringify(data), 'utf-8');
|
|
lengthBuffer.writeInt32BE(messageBuffer.length, 0);
|
|
this.writePipe.write(lengthBuffer);
|
|
this.writePipe.write(messageBuffer);
|
|
}
|
|
|
|
writeEnd() {
|
|
const lengthBuffer = Buffer.alloc(4);
|
|
lengthBuffer.writeInt32BE(0, 0);
|
|
this.writePipe.write(lengthBuffer);
|
|
}
|
|
|
|
readNextMessage() {
|
|
this.state = 'read length';
|
|
this.readBuffer(4, (lengthReadError, lengthBuffer) => {
|
|
if (lengthReadError) {
|
|
console.error(`Failed to communicate with worker (read length) ${lengthReadError}`);
|
|
return;
|
|
}
|
|
this.state = 'length read';
|
|
const length = lengthBuffer.readInt32BE(0);
|
|
|
|
this.state = 'read message';
|
|
this.readBuffer(length, (messageError, messageBuffer) => {
|
|
if (messageError) {
|
|
console.error(`Failed to communicate with worker (read message) ${messageError}`);
|
|
return;
|
|
}
|
|
this.state = 'message read';
|
|
const messageString = messageBuffer.toString('utf-8');
|
|
const message = JSON.parse(messageString);
|
|
this.state = 'process message';
|
|
this.onWorkerMessage(message, err => {
|
|
if (err) {
|
|
console.error(`Failed to communicate with worker (process message) ${err}`);
|
|
return;
|
|
}
|
|
this.state = 'soon next';
|
|
setImmediate(() => this.readNextMessage());
|
|
});
|
|
});
|
|
});
|
|
}
|
|
|
|
onWorkerMessage(message, finalCallback) {
|
|
const { type, id } = message;
|
|
switch (type) {
|
|
case 'job':
|
|
{
|
|
const { data, error, result } = message;
|
|
(0, _mapSeries2.default)(data, (length, callback) => this.readBuffer(length, callback), (eachErr, buffers) => {
|
|
const { callback: jobCallback } = this.jobs[id];
|
|
const callback = (err, arg) => {
|
|
if (jobCallback) {
|
|
delete this.jobs[id];
|
|
this.activeJobs -= 1;
|
|
this.onJobDone();
|
|
if (err) {
|
|
jobCallback(err instanceof Error ? err : new Error(err), arg);
|
|
} else {
|
|
jobCallback(null, arg);
|
|
}
|
|
}
|
|
finalCallback();
|
|
};
|
|
if (eachErr) {
|
|
callback(eachErr);
|
|
return;
|
|
}
|
|
let bufferPosition = 0;
|
|
if (result.result) {
|
|
result.result = result.result.map(r => {
|
|
if (r.buffer) {
|
|
const buffer = buffers[bufferPosition];
|
|
bufferPosition += 1;
|
|
if (r.string) {
|
|
return buffer.toString('utf-8');
|
|
}
|
|
return buffer;
|
|
}
|
|
return r.data;
|
|
});
|
|
}
|
|
if (error) {
|
|
callback(this.fromErrorObj(error), result);
|
|
return;
|
|
}
|
|
callback(null, result);
|
|
});
|
|
break;
|
|
}
|
|
case 'resolve':
|
|
{
|
|
const { context, request, questionId } = message;
|
|
const { data } = this.jobs[id];
|
|
data.resolve(context, request, (error, result) => {
|
|
this.writeJson({
|
|
type: 'result',
|
|
id: questionId,
|
|
error: error ? {
|
|
message: error.message,
|
|
details: error.details,
|
|
missing: error.missing
|
|
} : null,
|
|
result
|
|
});
|
|
});
|
|
finalCallback();
|
|
break;
|
|
}
|
|
case 'emitWarning':
|
|
{
|
|
const { data } = message;
|
|
const { data: jobData } = this.jobs[id];
|
|
jobData.emitWarning(this.fromErrorObj(data));
|
|
finalCallback();
|
|
break;
|
|
}
|
|
case 'emitError':
|
|
{
|
|
const { data } = message;
|
|
const { data: jobData } = this.jobs[id];
|
|
jobData.emitError(this.fromErrorObj(data));
|
|
finalCallback();
|
|
break;
|
|
}
|
|
default:
|
|
{
|
|
console.error(`Unexpected worker message ${type} in WorkerPool.`);
|
|
finalCallback();
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
fromErrorObj(arg) {
|
|
let obj;
|
|
if (typeof arg === 'string') {
|
|
obj = { message: arg };
|
|
} else {
|
|
obj = arg;
|
|
}
|
|
return new _WorkerError2.default(obj, this.id);
|
|
}
|
|
|
|
readBuffer(length, callback) {
|
|
(0, _readBuffer2.default)(this.readPipe, length, callback);
|
|
}
|
|
|
|
dispose() {
|
|
if (!this.disposed) {
|
|
this.disposed = true;
|
|
this.ignoreStdOutAndErrFromWorker(this.worker.stdout, this.worker.stderr);
|
|
this.writeEnd();
|
|
}
|
|
}
|
|
}
|
|
|
|
class WorkerPool {
|
|
constructor(options) {
|
|
this.options = options || {};
|
|
this.numberOfWorkers = options.numberOfWorkers;
|
|
this.poolTimeout = options.poolTimeout;
|
|
this.workerNodeArgs = options.workerNodeArgs;
|
|
this.workerParallelJobs = options.workerParallelJobs;
|
|
this.workers = new Set();
|
|
this.activeJobs = 0;
|
|
this.timeout = null;
|
|
this.poolQueue = (0, _queue2.default)(this.distributeJob.bind(this), options.poolParallelJobs);
|
|
this.terminated = false;
|
|
|
|
this.setupLifeCycle();
|
|
}
|
|
|
|
isAbleToRun() {
|
|
return !this.terminated;
|
|
}
|
|
|
|
terminate() {
|
|
if (this.terminated) {
|
|
return;
|
|
}
|
|
|
|
this.terminated = true;
|
|
this.poolQueue.kill();
|
|
this.disposeWorkers(true);
|
|
}
|
|
|
|
setupLifeCycle() {
|
|
process.on('exit', () => {
|
|
this.terminate();
|
|
});
|
|
}
|
|
|
|
run(data, callback) {
|
|
if (this.timeout) {
|
|
clearTimeout(this.timeout);
|
|
this.timeout = null;
|
|
}
|
|
this.activeJobs += 1;
|
|
this.poolQueue.push(data, callback);
|
|
}
|
|
|
|
distributeJob(data, callback) {
|
|
// use worker with the fewest jobs
|
|
let bestWorker;
|
|
for (const worker of this.workers) {
|
|
if (!bestWorker || worker.activeJobs < bestWorker.activeJobs) {
|
|
bestWorker = worker;
|
|
}
|
|
}
|
|
if (bestWorker && (bestWorker.activeJobs === 0 || this.workers.size >= this.numberOfWorkers)) {
|
|
bestWorker.run(data, callback);
|
|
return;
|
|
}
|
|
const newWorker = this.createWorker();
|
|
newWorker.run(data, callback);
|
|
}
|
|
|
|
createWorker() {
|
|
// spin up a new worker
|
|
const newWorker = new PoolWorker({
|
|
nodeArgs: this.workerNodeArgs,
|
|
parallelJobs: this.workerParallelJobs
|
|
}, () => this.onJobDone());
|
|
this.workers.add(newWorker);
|
|
return newWorker;
|
|
}
|
|
|
|
warmup(requires) {
|
|
while (this.workers.size < this.numberOfWorkers) {
|
|
this.createWorker().warmup(requires);
|
|
}
|
|
}
|
|
|
|
onJobDone() {
|
|
this.activeJobs -= 1;
|
|
if (this.activeJobs === 0 && isFinite(this.poolTimeout)) {
|
|
this.timeout = setTimeout(() => this.disposeWorkers(), this.poolTimeout);
|
|
}
|
|
}
|
|
|
|
disposeWorkers(fromTerminate) {
|
|
if (!this.options.poolRespawn && !fromTerminate) {
|
|
this.terminate();
|
|
return;
|
|
}
|
|
|
|
if (this.activeJobs === 0 || fromTerminate) {
|
|
for (const worker of this.workers) {
|
|
worker.dispose();
|
|
}
|
|
this.workers.clear();
|
|
}
|
|
}
|
|
}
|
|
exports.default = WorkerPool; |