workerpool/dist/workerpool.min.js

Offload tasks to a pool of workers on node.js and in the browser

/*! For license information please see workerpool.min.js.LICENSE.txt */
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e?this.script=e||null:(this.script=null,n=e),this.workers=[],this.tasks=[],n=n||{},this.forkArgs=Object.freeze(n.forkArgs||[]),this.forkOpts=Object.freeze(n.forkOpts||{}),this.workerOpts=Object.freeze(n.workerOpts||{}),this.workerThreadOpts=Object.freeze(n.workerThreadOpts||{}),this.debugPortStart=n.debugPortStart||43210,this.nodeWorker=n.nodeWorker,this.workerType=n.workerType||n.nodeWorker||"auto",this.maxQueueSize=n.maxQueueSize||1/0,this.workerTerminateTimeout=n.workerTerminateTimeout||1e3,this.onCreateWorker=n.onCreateWorker||function(){return null},this.onTerminateWorker=n.onTerminateWorker||function(){return null},this.emitStdStreams=n.emitStdStreams||!1,n&&"maxWorkers"in n?(!function(e){if(!u(e)||!a(e)||e<1)throw new TypeError("Option maxWorkers must be an integer number >= 1")}(n.maxWorkers),this.maxWorkers=n.maxWorkers):this.maxWorkers=Math.max((t.cpus||4)-1,1),n&&"minWorkers"in n&&("max"===n.minWorkers?this.minWorkers=this.maxWorkers:(!function(e){if(!u(e)||!a(e)||e<0)throw new TypeError("Option minWorkers must be an integer number >= 0")}(n.minWorkers),this.minWorkers=n.minWorkers,this.maxWorkers=Math.max(this.minWorkers,this.maxWorkers)),this._ensureMinWorkers()),this._boundNext=this._next.bind(this),"thread"===this.workerType&&r.ensureWorkerThreads()}function u(e){return"number"==typeof e}function a(e){return Math.round(e)==e}return i.prototype.exec=function(r,t,n){if(t&&!Array.isArray(t))throw new TypeError('Array expected as argument "params"');if("string"==typeof r){var o=e.defer();if(this.tasks.length>=this.maxQueueSize)throw new Error("Max queue size of "+this.maxQueueSize+" reached");var i=this.tasks,s={method:r,params:t,resolver:o,timeout:null,options:n};i.push(s);var u=o.promise.timeout;return o.promise.timeout=function(e){return-1!==i.indexOf(s)?(s.timeout=e,o.promise):u.call(o.promise,e)},this._next(),o.promise}if("function"==typeof r)return this.exec("run",[String(r),t],n);throw new TypeError('Function or string expected as argument "method"')},i.prototype.proxy=function(){if(arguments.length>0)throw new Error("No arguments expected");var e=this;return this.exec("methods").then((function(r){var t={};return r.forEach((function(r){t[r]=function(){return e.exec(r,Array.prototype.slice.call(arguments))}})),t}))},i.prototype._next=function(){if(this.tasks.length>0){var e=this._getWorker();if(e){var r=this,t=this.tasks.shift();if(t.resolver.promise.pending){var n=e.exec(t.method,t.params,t.resolver,t.options).then(r._boundNext).catch((function(){if(e.terminated)return r._removeWorker(e)})).then((function(){r._next()}));"number"==typeof t.timeout&&n.timeout(t.timeout)}else r._next()}}},i.prototype._getWorker=function(){for(var e=this.workers,r=0;r<e.length;r++){var t=e[r];if(!1===t.busy())return t}return e.length<this.maxWorkers?(t=this._createWorkerHandler(),e.push(t),t):null},i.prototype._removeWorker=function(r){var t=this;return n.releasePort(r.debugPort),this._removeWorkerFromList(r),this._ensureMinWorkers(),new e((function(e,n){r.terminate(!1,(function(o){t.onTerminateWorker({forkArgs:r.forkArgs,forkOpts:r.forkOpts,workerThreadOpts:r.workerThreadOpts,script:r.script}),o?n(o):e(r)}))}))},i.prototype._removeWorkerFromList=function(e){var r=this.workers.indexOf(e);-1!==r&&this.workers.splice(r,1)},i.prototype.terminate=function(r,t){var o=this;this.tasks.forEach((function(e){e.resolver.reject(new Error("Pool terminated"))})),this.tasks.length=0;var i=function(e){n.releasePort(e.debugPort),this._removeWorkerFromList(e)}.bind(this),s=[];return this.workers.slice().forEach((function(e){var n=e.terminateAndNotify(r,t).then(i).always((function(){o.onTerminateWorker({forkArgs:e.forkArgs,forkOpts:e.forkOpts,workerThreadOpts:e.workerThreadOpts,script:e.script})}));s.push(n)})),e.all(s)},i.prototype.stats=function(){var e=this.workers.length,r=this.workers.filter((function(e){return e.busy()})).length;return{totalWorkers:e,busyWorkers:r,idleWorkers:e-r,pendingTasks:this.tasks.length,activeTasks:r}},i.prototype._ensureMinWorkers=function(){if(this.minWorkers)for(var e=this.workers.length;e<this.minWorkers;e++)this.workers.push(this._createWorkerHandler())},i.prototype._createWorkerHandler=function(){var e=this.onCreateWorker({forkArgs:this.forkArgs,forkOpts:this.forkOpts,workerOpts:this.workerOpts,workerThreadOpts:this.workerThreadOpts,script:this.script})||{};return new r(e.script||this.script,{forkArgs:e.forkArgs||this.forkArgs,forkOpts:e.forkOpts||this.forkOpts,workerOpts:e.workerOpts||this.workerOpts,workerThreadOpts:e.workerThreadOpts||this.workerThreadOpts,debugPort:n.nextAvailableStartingAt(this.debugPortStart),workerType:this.workerType,workerTerminateTimeout:this.workerTerminateTimeout,emitStdStreams:this.emitStdStreams})},y=i}var E,j,W,_={};function S(){if(j)return E;return j=1,E=function(e,r){this.message=e,this.transfer=r}}function P(){return W||(W=1,function(e){var r=S(),t=s().Promise,n="__workerpool-cleanup__",o={exit:function(){}},i={addAbortListener:function(e){o.abortListeners.push(e)},emit:o.emit};if("undefined"!=typeof self&&"function"==typeof postMessage&&"function"==typeof addEventListener)o.on=function(e,r){addEventListener(e,(function(e){r(e.data)}))},o.send=function(e,r){r?postMessage(e,r):postMessage(e)};else{if("undefined"==typeof process)throw new Error("Script must be executed as a worker");var u;try{u=require("worker_threads")}catch(e){if("object"!==d(e)||null===e||"MODULE_NOT_FOUND"!==e.code)throw e}if(u&&null!==u.parentPort){var a=u.parentPort;o.send=a.postMessage.bind(a),o.on=a.on.bind(a),o.exit=process.exit.bind(process)}else o.on=process.on.bind(process),o.send=function(e){process.send(e)},o.on("disconnect",(function(){process.exit(1)})),o.exit=process.exit.bind(process)}function c(e){return Object.getOwnPropertyNames(e).reduce((function(r,t){return Object.defineProperty(r,t,{value:e[t],enumerable:!0})}),{})}function f(e){return e&&"function"==typeof e.then&&"function"==typeof e.catch}o.methods={},o.methods.run=function(e,r){var t=new Function("return ("+e+").apply(this, arguments);");return t.worker=i,t.apply(t,r)},o.methods.methods=function(){return Object.keys(o.methods)},o.terminationHandler=void 0,o.abortListenerTimeout=1e3,o.abortListeners=[],o.terminateAndExit=function(e){var r=function(){o.exit(e)};if(!o.terminationHandler)return r();var n=o.terminationHandler(e);return f(n)?(n.then(r,r),n):(r(),new t((function(e,r){r(new Error("Worker terminating"))})))},o.cleanup=function(e){if(!o.abortListeners.length)return o.send({id:e,method:n,error:c(new Error("Worker terminating"))}),new t((function(e){e()}));var r,i=o.abortListeners.map((function(e){return e()})),s=new t((function(e,t){r=setTimeout((function(){t(new Error("Timeout occured waiting for abort handler, killing worker"))}),o.abortListenerTimeout)})),u=t.all(i).then((function(){clearTimeout(r),o.abortListeners.length||(o.abortListeners=[])}),(function(){clearTimeout(r),o.exit()}));return new t((function(e,r){u.then(e,r),s.then(e,r)})).then((function(){o.send({id:e,method:n,error:null})}),(function(r){o.send({id:e,method:n,error:r?c(r):null})}))};var p=null;o.on("message",(function(e){if("__workerpool-terminate__"===e)return o.terminateAndExit(0);if(e.method===n)return o.cleanup(e.id);try{var t=o.methods[e.method];if(!t)throw new Error('Unknown method "'+e.method+'"');p=e.id;var i=t.apply(t,e.params);f(i)?i.then((function(t){t instanceof r?o.send({id:e.id,result:t.message,error:null},t.transfer):o.send({id:e.id,result:t,error:null}),p=null})).catch((function(r){o.send({id:e.id,result:null,error:c(r)}),p=null})):(i instanceof r?o.send({id:e.id,result:i.message,error:null},i.transfer):o.send({id:e.id,result:i,error:null}),p=null)}catch(r){o.send({id:e.id,result:null,error:c(r)})}})),o.register=function(e,r){if(e)for(var t in e)e.hasOwnProperty(t)&&(o.methods[t]=e[t],o.methods[t].worker=i);r&&(o.terminationHandler=r.onTerminate,o.abortListenerTimeout=r.abortListenerTimeout||1e3),o.send("ready")},o.emit=function(e){if(p){if(e instanceof r)return void o.send({id:p,isEvent:!0,payload:e.message},e.transfer);o.send({id:p,isEvent:!0,payload:e})}},e.add=o.register,e.emit=o.emit}(_)),_}var A=o.platform,L=o.isMainThread,M=o.cpus;var N=r.pool=function(e,r){return new(x())(e,r)};var U=r.worker=function(e,r){P().add(e,r)};var C=r.workerEmit=function(e){P().emit(e)},H=s().Promise,q=r.Promise=H,F=r.Transfer=S(),z=r.platform=A,D=r.isMainThread=L,I=r.cpus=M;e.Promise=q,e.Transfer=F,e.cpus=I,e.default=r,e.isMainThread=D,e.platform=z,e.pool=N,e.worker=U,e.workerEmit=C,Object.defineProperty(e,"__esModule",{value:!0})}));
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