better cache

site/tests/cache-wrapper.test.ts

@@ -0,0 +1,40 @@
+import { describe, expect, it } from "vitest";
+
+import { createMemoryCache } from "../src/lib/cache/memory-cache";
+import { cachedCompute } from "../src/lib/cache/memoize";
+
+function sleep(ms: number) {
+  return new Promise((r) => setTimeout(r, ms));
+}
+
+describe("cache wrapper", () => {
+  it("set/get JSON and expires by TTL", async () => {
+    const cache = createMemoryCache(1);
+    await cache.setJson("k", { a: 1 }, 1);
+
+    const v1 = await cache.getJson<{ a: number }>("k");
+    expect(v1).toEqual({ a: 1 });
+
+    await sleep(1100);
+    const v2 = await cache.getJson("k");
+    expect(v2).toBeUndefined();
+  });
+
+  it("cachedCompute hits on second call within TTL", async () => {
+    const cache = createMemoryCache(60);
+    let calls = 0;
+    const compute = async () => {
+      calls++;
+      return { ok: true, n: calls };
+    };
+
+    const r1 = await cachedCompute(cache, "x", compute, 60);
+    const r2 = await cachedCompute(cache, "x", compute, 60);
+
+    expect(r1.cached).toBe(false);
+    expect(r2.cached).toBe(true);
+    expect(calls).toBe(1);
+    expect(r2.value).toEqual(r1.value);
+  });
+});
+