feat: api data layer

src/data/api/cache.ts

@@ -0,0 +1,51 @@
+import { browser } from "$app/environment";
+
+import { dev_log } from "$lib/utils";
+
+const CACHE_KEY_PREFIX = "revanced_api_cache_l1";
+const L1_CACHE_VALIDITY = 5 * 60 * 1000; // 5 minutes
+
+function l1_key_name(endpoint: string) {
+  return `${CACHE_KEY_PREFIX}:${endpoint}`;
+}
+
+// Get item from the cache
+export function get(endpoint: string) {
+  if (!browser) {
+    return null;
+  }
+
+  const key_name = l1_key_name(endpoint);
+  const ls_data: { valid_until: number; data: any } | null = JSON.parse(localStorage.getItem(key_name));
+
+  if (ls_data === null || ls_data.valid_until <= Date.now()) {
+    dev_log("Cache", `missed "${endpoint}"`);
+    localStorage.removeItem(key_name);
+    return null;
+  }
+
+
+  dev_log("Cache", `hit "${endpoint}"`);
+  return ls_data.data;
+}
+
+// Update the cache
+export function update(endpoint: string, data: any) {
+  if (!browser) {
+    return;
+  }
+
+  localStorage.setItem(l1_key_name(endpoint), JSON.stringify({
+    data,
+    valid_until: Date.now() + L1_CACHE_VALIDITY
+  }));
+}
+
+// Clear the cache
+export function clear() {
+  for (const key of Object.keys(localStorage)) {
+    if (key.startsWith(CACHE_KEY_PREFIX)) {
+      localStorage.removeItem(key);
+    }
+  }
+}