subservient
Version:
The easiest way to multithread in node.js
204 lines (203 loc) • 8.56 kB
JavaScript
;
var __extends = (this && this.__extends) || (function () {
var extendStatics = function (d, b) {
extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
return extendStatics(d, b);
};
return function (d, b) {
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (_) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.WorkerInterface = void 0;
var events_1 = require("events");
var worker_threads_1 = require("worker_threads");
var uuid_1 = require("uuid");
var log = require('debug')('subservient:workerMaster');
var WorkerInterface = /** @class */ (function (_super) {
__extends(WorkerInterface, _super);
function WorkerInterface(file, idleTime) {
var _this = _super.call(this) || this;
_this.lock_ = '';
_this.idleTime = 0;
_this.interface = undefined;
_this.commandQueue = [];
_this.idleTime = idleTime || 0;
_this.worker = new worker_threads_1.Worker(file, {
workerData: {
idleTime: _this.idleTime,
},
});
_this.lastUnlock = Date.now();
_this.id = uuid_1.v1();
_this.worker.on('message', function (value) { return _this.processMessage(value); });
_this.sendCommand('getExposed', {})
.then(function (data) {
_this.interface = data;
_this.emit('interfaceReady');
})
.catch(function (e) {
throw e;
});
return _this;
}
WorkerInterface.prototype.sendCommand = function (command, args, opts) {
var _this = this;
return new Promise(function (resolve, reject) {
var id = uuid_1.v1();
log('sending command', command, ':', id);
_this.commandQueue.push({ command: command, id: id });
_this.worker.postMessage({
command: command,
id: id,
arguments: args,
});
_this.worker.once('error', function (e) {
console.log('worker threw', e);
});
if (opts === null || opts === void 0 ? void 0 : opts.noAwait)
return resolve();
_this.once(id + 'Resolved', function (err, msg) {
if (err)
reject(err);
else
resolve(msg);
});
});
};
WorkerInterface.prototype.processMessage = function (msg) {
log('received', msg);
var idx = 0;
var command = this.commandQueue.find(function (c, i) {
if (c.id === msg.id) {
idx = i;
return true;
}
else
return false;
});
log('task queue', this.commandQueue);
if (!command)
return; // Ignore if the message cannot be matched to a command
this.commandQueue.splice(idx, 1);
this.emit(command.id + 'Resolved', msg.err, msg.res);
};
WorkerInterface.prototype.computeInterface = function () {
var _this = this;
return this.interface
.map(function (k) { return [
k,
function () {
var args = [];
for (var _i = 0; _i < arguments.length; _i++) {
args[_i] = arguments[_i];
}
return new Promise(function (resolve, reject) {
_this.sendCommand('runMethod', { name: k, params: args })
.then(function (data) {
resolve(data);
_this.unlock(_this.lock_);
})
.catch(function (e) {
reject(e);
_this.unlock(_this.lock_);
});
});
},
]; })
.reduce(function (a, v) {
a[v[0]] = v[1];
return a;
}, {});
};
WorkerInterface.prototype.getInterface = function () {
var _this = this;
return new Promise(function (resolve, reject) {
if (_this.interface)
return resolve(_this.computeInterface());
_this.once('interfaceReady', function () {
resolve(_this.computeInterface());
});
});
};
WorkerInterface.prototype.isIdle = function () {
return !this.lock_;
};
WorkerInterface.prototype.lock = function () {
var _this = this;
return new Promise(function (resolve) {
_this.emit('lock');
var lock = uuid_1.v1();
_this.lock_ = lock;
setTimeout(function () {
if (_this.lock_ === lock)
return resolve(lock);
resolve('');
}, 20);
});
};
WorkerInterface.prototype.unlock = function (l) {
if (this.lock_ === l) {
this.lock_ = '';
this.lastUnlock = Date.now();
this.emit('unlock', this);
}
};
WorkerInterface.prototype.isOverDue = function () {
return this.idleTime && this.isIdle() ? this.lastUnlock + this.idleTime > Date.now() : false;
};
WorkerInterface.prototype.end = function () {
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_a) {
switch (_a.label) {
case 0: return [4 /*yield*/, this.sendCommand('end', {}, { noAwait: true })];
case 1:
_a.sent();
return [2 /*return*/];
}
});
});
};
return WorkerInterface;
}(events_1.EventEmitter));
exports.WorkerInterface = WorkerInterface;