Hank
3397e3e3ec
Backend (Fastify + TS): FluentForms webhook -> NocoDB row + QR + MailerSend email; PIN auth; scan/lookup/redeem with per-code serialization; reusable QR codes with count-based check-in; admin search. App (Expo, one codebase): Android APK + iPhone PWA. Login, camera scanner (native + web barcode-detector split), green/red overlay with sound + haptics, admin lookup/redeem. Session token persisted per device. Ops: multi-stage Dockerfile serving API + PWA same-origin, compose bound to 127.0.0.1; Forgejo Actions runner + tag-triggered signed APK build for Obtainium. Docs in README.md and INSTALL.md. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
48 lines
1.5 KiB
TypeScript
48 lines
1.5 KiB
TypeScript
/**
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* Per-key serialization. NocoDB has no atomic increment, so all read-modify-write
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* operations for a given ticket code must run one at a time. Operations on
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* different codes run concurrently.
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*
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* IMPORTANT: correctness depends on a SINGLE backend instance. Never scale this
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* service to multiple replicas — the queue is in-process only.
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*/
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export class RedeemQueue {
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private chains = new Map<string, Promise<unknown>>();
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private readonly timeoutMs: number;
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constructor(timeoutMs = 10_000) {
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this.timeoutMs = timeoutMs;
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}
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/** Run `fn` after any in-flight op for `key` completes. */
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run<T>(key: string, fn: () => Promise<T>): Promise<T> {
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const prior = this.chains.get(key) ?? Promise.resolve();
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// Chain regardless of whether the prior op resolved or rejected.
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const next = prior.catch(() => undefined).then(() => this.withTimeout(fn));
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this.chains.set(key, next);
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// Clean up the map entry once this is the tail of the chain.
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next.finally(() => {
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if (this.chains.get(key) === next) this.chains.delete(key);
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}).catch(() => undefined);
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return next;
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}
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private withTimeout<T>(fn: () => Promise<T>): Promise<T> {
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return new Promise<T>((resolve, reject) => {
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const timer = setTimeout(
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() => reject(new Error("redeem operation timed out")),
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this.timeoutMs,
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);
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fn().then(
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(v) => {
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clearTimeout(timer);
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resolve(v);
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},
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(e) => {
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clearTimeout(timer);
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reject(e);
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},
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);
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});
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}
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}
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