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| 1 | +import { afterEach, describe, expect, it, vi } from "vitest"; |
| 2 | +import { DiscordEntityCache } from "./entity-cache.js"; |
| 3 | +import type { RequestClient } from "./rest.js"; |
| 4 | +import type { StructureClient } from "./structures.js"; |
| 5 | + |
| 6 | +function makeCache(opts: { ttlMs?: number; maxEntries?: number; sweepIntervalMs?: number }) { |
| 7 | +let getCalls = 0; |
| 8 | +const rest = { |
| 9 | +get: async (route: string) => { |
| 10 | +getCalls += 1; |
| 11 | +const id = route.split("/").pop() ?? "x"; |
| 12 | +return { id }; |
| 13 | +}, |
| 14 | +} as unknown as RequestClient; |
| 15 | +const client = {} as StructureClient; |
| 16 | +const cache = new DiscordEntityCache({ client, rest, ...opts }); |
| 17 | +return { cache, getCalls: () => getCalls }; |
| 18 | +} |
| 19 | + |
| 20 | +describe("DiscordEntityCache eviction", () => { |
| 21 | +afterEach(() => { |
| 22 | +vi.useRealTimers(); |
| 23 | +}); |
| 24 | + |
| 25 | +it("caps entries by dropping oldest on insert past maxEntries", async () => { |
| 26 | +const { cache } = makeCache({ ttlMs: 60_000, maxEntries: 3 }); |
| 27 | + |
| 28 | +await cache.fetchUser("u1"); |
| 29 | +await cache.fetchUser("u2"); |
| 30 | +await cache.fetchUser("u3"); |
| 31 | +expect(cache.size).toBe(3); |
| 32 | + |
| 33 | +await cache.fetchUser("u4"); |
| 34 | +expect(cache.size).toBe(3); |
| 35 | +}); |
| 36 | + |
| 37 | +it("sweeps expired entries on insert when sweep interval has elapsed", async () => { |
| 38 | +vi.useFakeTimers(); |
| 39 | +vi.setSystemTime(new Date("2026-01-01T00:00:00Z")); |
| 40 | +const { cache } = makeCache({ ttlMs: 1, sweepIntervalMs: 0, maxEntries: 1000 }); |
| 41 | + |
| 42 | +await cache.fetchUser("u1"); |
| 43 | +await cache.fetchUser("u2"); |
| 44 | +expect(cache.size).toBe(2); |
| 45 | + |
| 46 | +vi.advanceTimersByTime(5); |
| 47 | + |
| 48 | +await cache.fetchUser("u3"); |
| 49 | +expect(cache.size).toBe(1); |
| 50 | +}); |
| 51 | + |
| 52 | +it("does not sweep before sweep interval elapses", async () => { |
| 53 | +vi.useFakeTimers(); |
| 54 | +vi.setSystemTime(new Date("2026-01-01T00:00:00Z")); |
| 55 | +const { cache } = makeCache({ |
| 56 | +ttlMs: 1, |
| 57 | +sweepIntervalMs: 60_000, |
| 58 | +maxEntries: 1000, |
| 59 | +}); |
| 60 | + |
| 61 | +await cache.fetchUser("u1"); |
| 62 | +await cache.fetchUser("u2"); |
| 63 | +vi.advanceTimersByTime(5); |
| 64 | +await cache.fetchUser("u3"); |
| 65 | + |
| 66 | +expect(cache.size).toBe(3); |
| 67 | +}); |
| 68 | + |
| 69 | +it("does not write when ttl is 0", async () => { |
| 70 | +const { cache } = makeCache({ ttlMs: 0 }); |
| 71 | + |
| 72 | +await cache.fetchUser("u1"); |
| 73 | +await cache.fetchUser("u2"); |
| 74 | + |
| 75 | +expect(cache.size).toBe(0); |
| 76 | +}); |
| 77 | +}); |
