allow custom storer interface

README.md

@@ -23,19 +23,32 @@ yarn add @BolajiOlajide/now-playing
 import { NowPlaying, Providers } from '@BolajiOlajide/now-playing'
 
 const np = new NowPlaying(Providers.SPOTIFY, {
-  useCache: false, // default is true
-  cacheDuration: 30000, // in milliseconds
+  useCache: false, // (optional) default is true
+  cacheDuration: 30000, // (optional) in milliseconds
   streamerArgs: {
     clientId: 'foo',
     clientSecret: 'bar',
     refreshToken: 'baz',
   },
+  storer: // (optional) custom
 })
 ```
 
 ### Storage
 
-Data is stored in memory. This is to reduce overhead. We plan to expose the `IStorer` interface later to allow you to use your own storage mechanism.
+We default to inmemory storage for saving information gotten via the API, (e.g Access tokens, Song data e.t.c).
+However you can pass in your own custom storage object, provided it satisfies the `IStorer` interface.
+
+```ts
+interface IStorer {
+  set<T>(key: string, value: T, duration: number): void
+  get<T>(key: string): T | undefined
+  delete(key: string): boolean
+  has(key: string): boolean
+  clear(): void
+  pruneExpiredEntries(): void
+}
+```
 
 ### Providers
 

src/main.ts

@@ -46,7 +46,7 @@ export class NowPlaying {
 
       // We only support in memory storage for now, if there's a need we can
       // support more storage mechanism.
-      this.storer = this.getStorer()
+      this.storer = args.storer || this.getStorer()
       this.streamer = this.getStreamer()
     } catch (err: unknown) {
       if (err instanceof ZodError) {

src/schema.ts

@@ -1,4 +1,5 @@
 import { z } from 'zod'
+import type { IStorer } from './storage'
 
 export enum Providers {
   SPOTIFY = 'SPOTIFY',
@@ -10,6 +11,25 @@ export const providerSchema = z.nativeEnum(Providers)
 export const BaseNowPlayingArgsSchema = z.object({
   useCache: z.boolean().optional(),
   cacheDuration: z.number().optional(),
+  storer: z
+    .custom<IStorer>(
+      (data: unknown): data is IStorer => {
+        return (
+          typeof data === 'object' &&
+          data !== null &&
+          typeof (data as IStorer).set === 'function' &&
+          typeof (data as IStorer).get === 'function' &&
+          typeof (data as IStorer).delete === 'function' &&
+          typeof (data as IStorer).has === 'function' &&
+          typeof (data as IStorer).clear === 'function' &&
+          typeof (data as IStorer).pruneExpiredEntries === 'function'
+        )
+      },
+      {
+        message: 'Object does not implement IStorer interface',
+      }
+    )
+    .optional(),
 })
 export type BaseNowPlayingArgs = z.infer<typeof BaseNowPlayingArgsSchema>