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https://github.com/MBombeck/HealthLog.git
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Marc-André Bombeck
06251d7219
A background job opens one wide event for its whole run, and the per-request memo cached the operator switches, module availability, module preferences, provider presence and consent kinds on it. The nightly status passes loop over every candidate inside that one event, so a switch turned off mid-run did not stop the remaining users, and the wire re-check read the same cached answer. memoizePerRequest takes a freshInBackground option; every input that decides whether AI work may run sets it, so a background caller reads them on every call while a request still reads them once.
94 lines
3.6 KiB
TypeScript
94 lines
3.6 KiB
TypeScript
/**
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* v1.4.33 — per-request memoisation carrier.
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*
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* Multiple gated routes share the same in-process request lifecycle
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* (api-handler wraps every handler in `eventStorage.run(builder, …)`),
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* yet the gate helpers and snapshot builders re-read the same row on
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* every call. The Coach drawer opening fires five fetches in parallel,
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* each of which resolves the AI capabilities —
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* five separate `SELECT` against `AppSettings.singleton` for the same
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* value within the same wall-clock millisecond.
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*
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* This helper attaches a request-scoped `Map<string, Promise<unknown>>`
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* to the active `WideEventBuilder` from `@/lib/logging/context`. Same
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* key inside one request = one compute; different requests get
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* independent caches; outside any request (e.g. tests with no event
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* context) the factory runs every time so behaviour is unchanged.
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*
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* The cache is keyed by string. Callers compose composite keys (e.g.
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* `"assistant-flags"` or `"coach-snapshot:${userId}:${windowKey}"`).
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* The cache is intentionally weak: it lives on the event builder
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* itself via a `WeakMap`, so it goes away as soon as the request
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* finishes and the builder is collected.
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*/
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import { getEvent } from "@/lib/logging/context";
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import type { WideEventBuilder } from "@/lib/logging/event-builder";
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const REQUEST_CACHES = new WeakMap<WideEventBuilder, Map<string, unknown>>();
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function getCache(builder: WideEventBuilder): Map<string, unknown> {
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let cache = REQUEST_CACHES.get(builder);
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if (!cache) {
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cache = new Map<string, unknown>();
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REQUEST_CACHES.set(builder, cache);
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}
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return cache;
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}
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export interface MemoizeOptions {
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/**
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* Read afresh on every call inside a background event.
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*
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* A request is short and acts for one record, so one read of the operator's
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* switches serves all of it. A background job opens one wide event for its
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* whole run, and a nightly pass loops over every user inside it: a cached
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* switch, module map, provider presence or consent set would be the answer
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* from the start of the run, served to every later user and to the wire
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* re-check, so turning the Assistant off at 02:05 would not stop the pass
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* that began at 02:00. Every input that decides whether AI work may run
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* sets this.
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*/
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freshInBackground?: boolean;
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}
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/**
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* Memoise `factory()` for the lifetime of the current request. Returns
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* the factory's result directly when no event context is active so
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* unit tests and background jobs that don't enter `eventStorage.run()`
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* keep their existing semantics.
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*
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* The cached value is the Promise itself, so concurrent callers within
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* the same request await one outstanding compute instead of starting
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* their own — important for the gate-cascade pattern where five
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* mounts resolve the same capabilities in parallel.
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*/
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export function memoizePerRequest<T>(
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key: string,
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factory: () => Promise<T>,
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options: MemoizeOptions = {},
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): Promise<T> {
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const event = getEvent();
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if (!event) {
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return factory();
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}
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if (options.freshInBackground && event.getKind() === "background") {
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return factory();
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}
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const cache = getCache(event);
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const existing = cache.get(key);
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if (existing !== undefined) {
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return existing as Promise<T>;
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}
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const promise = factory();
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cache.set(key, promise);
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// If the factory rejects, evict so a retry on the same key inside
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// this request gets a fresh attempt. Cached failures inside a single
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// request would mask real recovery (e.g. transient DB hiccup).
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promise.catch(() => {
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if (cache.get(key) === promise) {
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cache.delete(key);
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}
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});
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return promise;
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}
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