feat: use memory/fs/kv storage drivers for server details (#34)

server/cache-driver.ts

@@ -0,0 +1,40 @@
+import type { Driver } from 'unstorage'
+// @ts-expect-error unstorage needs to provide backwards-compatible subpath types
+import _memory from 'unstorage/drivers/memory'
+import { defineDriver } from 'unstorage'
+
+const memory = _memory as typeof import('unstorage/dist/drivers/memory')['default']
+
+export interface CacheDriverOptions {
+  driver: Driver
+}
+
+export default defineDriver((driver: Driver = memory()) => {
+  const memoryDriver = memory()
+  return {
+    ...driver,
+    async hasItem(key: string) {
+      if (await memoryDriver.hasItem(key))
+        return true
+
+      return driver.hasItem(key)
+    },
+    async setItem(key: string, value: any) {
+      await Promise.all([
+        memoryDriver.setItem(key, value),
+        driver.setItem?.(key, value),
+      ])
+    },
+    async getItem(key: string) {
+      let value = await memoryDriver.getItem(key)
+
+      if (value !== null)
+        return value
+
+      value = await driver.getItem(key)
+      memoryDriver.setItem(key, value)
+
+      return value
+    },
+  }
+})