webdetector/ts/index.ts

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import * as plugins from './webdetector.plugins';
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import {throttleTime } from 'rxjs/operators';
export interface IWebDetectorOptions {
checkOnlineUrl: string;
}
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export class WebDetector {
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options: IWebDetectorOptions;
private onlineObservableIntake = new plugins.smartrx.ObservableIntake();
onlineObservable = this.onlineObservableIntake.observable.pipe(throttleTime(10000));
latestState: 'online' | 'offline' = 'online';
constructor(optionsArg: IWebDetectorOptions) {
this.options = optionsArg;
}
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/**
*
*/
async isOnline() {
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let reachesInternet: boolean = false;
const controller = new AbortController();
const fetchPromise = fetch(this.options.checkOnlineUrl, { signal: controller.signal });
const timeout = setTimeout(() => {
controller.abort();
}, 1000);
await fetchPromise.then(async response => {
reachesInternet = true
}).catch(err => {
// console.log(`request to ${this.options.checkOnlineUrl} failed}`)
});
const latestLocalState = (() => {
if(reachesInternet) {
return 'online'
} else {
return 'offline'
}
})();
if(latestLocalState !== this.latestState) {
this.onlineObservableIntake.push(this.latestState);
}
this.latestState = latestLocalState;
return reachesInternet;
}
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async startPeriodicChecks() {
while (true) {
await this.isOnline();
await plugins.smartdelay.delayFor(3000);
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}
}
}