33 lines
873 B
JavaScript
33 lines
873 B
JavaScript
// Throttle network requests to be a good citizen and not issue an HTTP request on every keystroke
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import { PromiseThrottler } from './PromiseThrottler.js'
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const promiseThrottler = new PromiseThrottler(200) // Mastodon FE also uses 200ms
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export class RequestThrottler {
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constructor (fetcher) {
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this._canceled = false
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this._controller = typeof AbortController === 'function' && new AbortController()
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this._fetcher = fetcher
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}
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async request () {
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if (this._canceled) {
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throw new Error('canceled')
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}
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await promiseThrottler.next()
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if (this._canceled) {
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throw new Error('canceled')
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}
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const signal = this._controller && this._controller.signal
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return this._fetcher(signal)
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}
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cancel () {
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this._canceled = true
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if (this._controller) {
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this._controller.abort()
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this._controller = null
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}
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}
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}
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