From 900bb5e845c3ad44defbd427cae3d44a4a43321f Mon Sep 17 00:00:00 2001
From: ivarlovlie <git@ivarlovlie.no>
Date: Sat, 25 Feb 2023 13:15:44 +0100
Subject: feat: Initial commit

---
 code/app/src/utilities/cache.ts | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 code/app/src/utilities/cache.ts

(limited to 'code/app/src/utilities/cache.ts')

diff --git a/code/app/src/utilities/cache.ts b/code/app/src/utilities/cache.ts
new file mode 100644
index 0000000..db9be9a
--- /dev/null
+++ b/code/app/src/utilities/cache.ts
@@ -0,0 +1,38 @@
+import { Temporal } from "temporal-polyfill";
+import { log_debug } from "$utilities/logger";
+
+let cache = {};
+
+export const CacheKeys = {
+    isAuthenticated: "isAuthenticated"
+}
+
+export async function cached_result_async<T>(key: string, staleAfterSeconds: number, get_result: any, forceRefresh: boolean = false) {
+    if (!cache[key]) {
+        cache[key] = {
+            l: 0,
+            c: undefined as T,
+        };
+    }
+    const staleEpoch = ((cache[key]?.l ?? 0) + staleAfterSeconds);
+    const isStale = forceRefresh || (staleEpoch < Temporal.Now.instant().epochSeconds);
+    if (isStale || !cache[key]?.c) {
+        cache[key].c = typeof get_result === "function" ? await get_result() : get_result;
+        cache[key].l = Temporal.Now.instant().epochSeconds;
+    }
+
+    log_debug("Ran cached_result_async", {
+        cacheKey: key,
+        isStale,
+        cache: cache[key],
+        staleEpoch,
+    });
+
+    return cache[key].c as T;
+}
+
+export function clear_cache_key(key: string) {
+    if (!key) throw new Error("No key was specified");
+    cache[key].c = undefined;
+    log_debug("Cleared cache with key: " + key);
+}
\ No newline at end of file
-- 
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