a50ee01626
Creates diff-cache.ts module with generic DiffCache<T> class (TTL, prefix invalidation, env-var configuration) and exports phaseMetaCache / fileDiffCache singletons. Wires cache into getPhaseReviewDiff via getHeadCommitHash on BranchManager. Adds 6 unit tests for DiffCache and 5 integration tests verifying cache hit/miss behaviour, prefix invalidation, and NOT_FOUND guard. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
49 lines
1.4 KiB
TypeScript
49 lines
1.4 KiB
TypeScript
/**
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* DiffCache — in-memory TTL cache for git diff results.
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*
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* Keyed by `phaseId:headHash` (or `phaseId:headHash:filePath` for per-file diffs).
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* TTL defaults to 5 minutes, configurable via REVIEW_DIFF_CACHE_TTL_MS env var.
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* Prefix-based invalidation clears all entries for a phase when a new commit lands.
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*/
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interface CacheEntry<T> {
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value: T;
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expiresAt: number;
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}
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export class DiffCache<T> {
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private store = new Map<string, CacheEntry<T>>();
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private ttlMs: number;
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constructor(ttlMs: number) {
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this.ttlMs = ttlMs;
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}
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get(key: string): T | undefined {
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const entry = this.store.get(key);
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if (!entry) return undefined;
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if (Date.now() > entry.expiresAt) {
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this.store.delete(key);
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return undefined;
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}
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return entry.value;
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}
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set(key: string, value: T): void {
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this.store.set(key, { value, expiresAt: Date.now() + this.ttlMs });
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}
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invalidateByPrefix(prefix: string): void {
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for (const key of this.store.keys()) {
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if (key.startsWith(prefix)) this.store.delete(key);
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}
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}
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}
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const TTL = parseInt(process.env.REVIEW_DIFF_CACHE_TTL_MS ?? '300000', 10);
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// Typed as unknown here; the actual type constraint is enforced at call sites
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// in phase.ts where PhaseMetaResponse / FileDiffResponse are inferred.
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export const phaseMetaCache = new DiffCache<unknown>(TTL);
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export const fileDiffCache = new DiffCache<unknown>(TTL);
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