@byterygon/workerr
Version:
Workerr is a lightweight library that simplifies working with Web Workers in JavaScript. It provides a more intuitive way to handle parallel tasks by using Promises, along with a built-in worker pool to efficiently manage worker instances. With strong Typ
2 lines (1 loc) • 21.7 kB
JavaScript
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z,R,A,W,j,D,P,F,x,H,I,q,O,U,v,Le,Ee,xe,_e,Pe,K,Z,ee,V,Ie,Y;class Qe extends $e{constructor(e){var n,s;super();L(this,v);L(this,z);L(this,R);L(this,A,0);L(this,W);L(this,j);L(this,D,0);L(this,P);L(this,F);L(this,x);L(this,H);L(this,I,0);L(this,q);L(this,O);L(this,U);_(this,"timeout");if(e={carryoverConcurrencyCount:!1,intervalCap:Number.POSITIVE_INFINITY,interval:0,concurrency:Number.POSITIVE_INFINITY,autoStart:!0,queueClass:Ue,...e},!(typeof e.intervalCap=="number"&&e.intervalCap>=1))throw new TypeError(`Expected \`intervalCap\` to be a number from 1 and up, got \`${((n=e.intervalCap)==null?void 0:n.toString())??""}\` (${typeof e.intervalCap})`);if(e.interval===void 0||!(Number.isFinite(e.interval)&&e.interval>=0))throw new TypeError(`Expected \`interval\` to be a finite number >= 0, got \`${((s=e.interval)==null?void 0:s.toString())??""}\` (${typeof e.interval})`);w(this,z,e.carryoverConcurrencyCount),w(this,R,e.intervalCap===Number.POSITIVE_INFINITY||e.interval===0),w(this,W,e.intervalCap),w(this,j,e.interval),w(this,x,new e.queueClass),w(this,H,e.queueClass),this.concurrency=e.concurrency,this.timeout=e.timeout,w(this,U,e.throwOnTimeout===!0),w(this,O,e.autoStart===!1)}get concurrency(){return u(this,q)}set concurrency(e){if(!(typeof e=="number"&&e>=1))throw new TypeError(`Expected \`concurrency\` to be a number from 1 and up, got \`${e}\` (${typeof e})`);w(this,q,e),E(this,v,V).call(this)}async add(e,n={}){return n={timeout:this.timeout,throwOnTimeout:u(this,U),...n},new Promise((s,o)=>{u(this,x).enqueue(async()=>{var i;Q(this,I)._++,Q(this,A)._++;try{(i=n.signal)==null||i.throwIfAborted();let a=e({signal:n.signal});n.timeout&&(a=De(Promise.resolve(a),{milliseconds:n.timeout})),n.signal&&(a=Promise.race([a,E(this,v,Ie).call(this,n.signal)]));const h=await a;s(h),this.emit("completed",h)}catch(a){if(a instanceof 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u(this,R)||u(this,A)<u(this,W)},Ee=function(){return u(this,I)<u(this,q)},xe=function(){Q(this,I)._--,E(this,v,K).call(this),this.emit("next")},_e=function(){E(this,v,ee).call(this),E(this,v,Z).call(this),w(this,F,void 0)},Pe=function(){const e=Date.now();if(u(this,P)===void 0){const n=u(this,D)-e;if(n<0)w(this,A,u(this,z)?u(this,I):0);else return u(this,F)===void 0&&w(this,F,setTimeout(()=>{E(this,v,_e).call(this)},n)),!0}return!1},K=function(){if(u(this,x).size===0)return u(this,P)&&clearInterval(u(this,P)),w(this,P,void 0),this.emit("empty"),u(this,I)===0&&this.emit("idle"),!1;if(!u(this,O)){const e=!u(this,v,Pe);if(u(this,v,Le)&&u(this,v,Ee)){const n=u(this,x).dequeue();return n?(this.emit("active"),n(),e&&E(this,v,Z).call(this),!0):!1}}return!1},Z=function(){u(this,R)||u(this,P)!==void 0||(w(this,P,setInterval(()=>{E(this,v,ee).call(this)},u(this,j))),w(this,D,Date.now()+u(this,j)))},ee=function(){u(this,A)===0&&u(this,I)===0&&u(this,P)&&(clearInterval(u(this,P)),w(this,P,void 0)),w(this,A,u(this,z)?u(this,I):0),E(this,v,V).call(this)},V=function(){for(;E(this,v,K).call(this););},Ie=async function(e){return new Promise((n,s)=>{e.addEventListener("abort",()=>{s(e.reason)},{once:!0})})},Y=async function(e,n){return new Promise(s=>{const o=()=>{n&&!n()||(this.off(e,o),s())};this.on(e,o)})};class re{constructor(t){_(this,"worker");_(this,"taskQueue");_(this,"concurrency");_(this,"context");_(this,"eventEmitter",new ge);_(this,"readyPromise");_(this,"ready",!1);_(this,"terminated",!1);try{this.worker=t.worker(),this.context=t.context??{},this.concurrency=t.concurrency||1/0,Number.isFinite(this.concurrency)&&this.concurrency>=1&&(this.taskQueue=new Qe({concurrency:this.concurrency})),this.readyPromise=new Promise((e,n)=>{const s=setTimeout(()=>{n(new Error("Cannot initialized worker"))},5e3),o=i=>{switch(i.data.messageType){case"initialization:start":clearTimeout(s);break;case"initialization:error":this.eventEmitter.emit("error",i.data.messagePayload),n(i.data.messagePayload),this.worker.removeEventListener("message",o);break;case"initialization:complete":this.ready=!0,this.postMessage({messageType:"initialization:ack",messagePayload:void 0}),this.updateContext(()=>this.context),this.worker.removeEventListener("message",o),this.eventEmitter.emit("ready"),e(!0);break}};this.worker.addEventListener("message",o)})}catch(e){throw e}}static create(t){return new re(t)}postMessage(t,e){this.worker.postMessage({...t,messageId:t.messageId??X(),timestamp:t.timestamp??Date.now()},e)}async awaitReady(){await this.readyPromise}async updateContext(t){if(this.terminated)throw new Error("Workerr had been terminated");this.context=t(this.context),this.postMessage({messageType:"context:update",messagePayload:this.context})}_invoke(t,e,n){return new Promise(async(s,o)=>{var f;await this.awaitReady;const i=X();let a,h;if(n!=null&&n.abortSignal){const p=new MessageChannel;a=p.port1,h=p.port2}const c=p=>{const m=p.target;a==null||a.postMessage(m.reason)};(f=n==null?void 0:n.abortSignal)==null||f.addEventListener("abort",c,{once:!0});const l=p=>{var g;let m=p.data;if((m.messageType==="excecute:error"||m.messageType==="excecute:response")&&m.messagePayload.messageId===i){switch(m.messageType){case"excecute:response":this.worker.removeEventListener("message",l),s(m.messagePayload.result);break;case"excecute:error":{this.worker.removeEventListener("message",l),o(m.messagePayload.error);break}}(g=n==null?void 0:n.abortSignal)==null||g.removeEventListener("abort",c),a==null||a.close()}};this.worker.addEventListener("message",l),this.postMessage({messageType:"excecute:start",messagePayload:{cmd:t,params:e,abortSignalChannelPort:h},messageId:i},{transfer:[...(n==null?void 0:n.transfer)??[],...h?[h]:[]]})})}async invoke(t,e,n){if(this.terminated)throw new Error("Workerr had been terminated");return this.taskQueue?this.taskQueue.add(({signal:s})=>this._invoke(t,e,{...n,abortSignal:s}),{signal:n==null?void 0:n.abortSignal}):this._invoke(t,e,n)}addListener(t,e){if(this.terminated)throw new Error("Workerr had been terminated");this.eventEmitter.addListener(t,e)}removeListener(t,e){if(this.terminated)throw new Error("Workerr had been terminated");this.eventEmitter.removeListener(t,e)}removeAllListeners(t){if(this.terminated)throw new Error("Workerr had been terminated");this.eventEmitter.removeAllListeners(t)}terminate(){this.worker.terminate(),this.removeAllListeners()}}exports.CommandBuilder=ke;exports.Workerr=N;exports.WorkerrController=re;