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firestar5683
00364fd645
Separate Galaxy authentication and local access policy from web presentation. Co-authored-by: Danny <dannyirwin31@yahoo.com> Co-authored-by: Prabhaav Pillai <prabhaav@msu.edu> Co-authored-by: dirwin31 <83434411+dirwin31@users.noreply.github.com> Co-authored-by: firestarsdog <229254897+firestarsdog@users.noreply.github.com>
25 lines
1.2 KiB
JavaScript
25 lines
1.2 KiB
JavaScript
// Shared background synchronization. Reads never replay a user's mutation.
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export class PollTimer {
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constructor({ read, interval = 10000, later = (fn, ms) => setTimeout(fn, ms), cancel = id => clearTimeout(id) }) {
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Object.assign(this, { read, interval, later, cancel })
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this.active = false
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this.generation = 0
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this.timer = null
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}
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start() { this.stop(); this.active = true; this.schedule() }
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stop() { this.generation++; this.active = false; this.cancel(this.timer); this.timer = null }
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schedule() {
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if (!this.active || this.timer !== null) return
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const generation = this.generation
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this.timer = this.later(async () => {
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if (!this.active || generation !== this.generation) return
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this.timer = null
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try { if (typeof document === "undefined" || !document.hidden) await this.read() }
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finally { if (generation === this.generation) this.schedule() }
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}, this.interval)
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}
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}
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export const connectionError = (error, fallback = "Galaxy could not connect. Reconnecting automatically…") =>
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error instanceof TypeError || error?.name === "NetworkError" || error?.name === "AbortError" || error?.name === "TimeoutError" ? fallback : error?.message || fallback
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