better cache

site/src/lib/cache/index.ts

@@ -0,0 +1,28 @@
+import type { CacheLogFn, CacheStore } from "./redis-cache";
+import {
+  createRedisCache,
+  resolveDefaultTtlSecondsFromEnv,
+  resolveRedisUrlFromEnv,
+} from "./redis-cache";
+import { createNoopCache } from "./noop-cache";
+
+export async function createCacheFromEnv(
+  env: NodeJS.ProcessEnv,
+  opts?: { namespace?: string; log?: CacheLogFn },
+): Promise<CacheStore> {
+  const url = resolveRedisUrlFromEnv(env);
+  if (!url) return createNoopCache(opts?.log);
+
+  try {
+    return await createRedisCache({
+      url,
+      defaultTtlSeconds: resolveDefaultTtlSecondsFromEnv(env),
+      namespace: opts?.namespace,
+      log: opts?.log,
+    });
+  } catch (e) {
+    opts?.log?.(`cache: disabled (redis connect failed: ${String(e)})`);
+    return createNoopCache(opts?.log);
+  }
+}
+