Add lazy store

examples/api/src/views/Store.svelte

@@ -1,5 +1,5 @@
 <script>
-  import { Store } from "@tauri-apps/plugin-store";
+  import { LazyStore } from "@tauri-apps/plugin-store";
   import { onMount } from "svelte";
 
   export let onMessage;
@@ -7,11 +7,10 @@
   let key;
   let value;
 
-  const store = new Store("cache.json");
+  const store = new LazyStore("cache.json");
   let cache = {};
 
   onMount(async () => {
-    await store.load();
     const values = await store.entries();
     for (const [key, value] of values) {
       cache[key] = value;
@@ -19,16 +18,14 @@
     cache = cache;
   });
 
-  function write(key, value) {
-    store
-      .set(key, value)
-      .then(() => store.get(key))
-      .then((v) => {
-        cache[key] = v;
-        cache = cache;
-      })
-      .then(() => store.save())
-      .catch(onMessage);
+  async function write(key, value) {
+    try {
+      await store.set(key, value);
+      const v = await store.get(key);
+      cache[key] = v;
+    } catch (error) {
+      onMessage(error);
+    }
   }
 </script>
 

plugins/store/api-iife.js

@@ -1 +1 @@
-if("__TAURI__"in window){var __TAURI_PLUGIN_STORE__=function(e){"use strict";var t,r;function a(e,t=!1){return window.__TAURI_INTERNALS__.transformCallback(e,t)}async function i(e,t={},r){return window.__TAURI_INTERNALS__.invoke(e,t,r)}"function"==typeof SuppressedError&&SuppressedError;class n{get rid(){return function(e,t,r,a){if("a"===r&&!a)throw new TypeError("Private accessor was defined without a getter");if("function"==typeof t?e!==t||!a:!t.has(e))throw new TypeError("Cannot read private member from an object whose class did not declare it");return"m"===r?a:"a"===r?a.call(e):a?a.value:t.get(e)}(this,t,"f")}constructor(e){t.set(this,void 0),function(e,t,r,a,i){if("function"==typeof t?e!==t||!i:!t.has(e))throw new TypeError("Cannot write private member to an object whose class did not declare it");t.set(e,r)}(this,t,e)}async close(){return i("plugin:resources|close",{rid:this.rid})}}async function s(e,t,r){const n={kind:"Any"};return i("plugin:event|listen",{event:e,target:n,handler:a(t)}).then((t=>async()=>async function(e,t){await i("plugin:event|unlisten",{event:e,eventId:t})}(e,t)))}t=new WeakMap,function(e){e.WINDOW_RESIZED="tauri://resize",e.WINDOW_MOVED="tauri://move",e.WINDOW_CLOSE_REQUESTED="tauri://close-requested",e.WINDOW_DESTROYED="tauri://destroyed",e.WINDOW_FOCUS="tauri://focus",e.WINDOW_BLUR="tauri://blur",e.WINDOW_SCALE_FACTOR_CHANGED="tauri://scale-change",e.WINDOW_THEME_CHANGED="tauri://theme-changed",e.WINDOW_CREATED="tauri://window-created",e.WEBVIEW_CREATED="tauri://webview-created",e.DRAG_ENTER="tauri://drag-enter",e.DRAG_OVER="tauri://drag-over",e.DRAG_DROP="tauri://drag-drop",e.DRAG_LEAVE="tauri://drag-leave"}(r||(r={}));class o extends n{constructor(e,t){super(e),this.path=t}async set(e,t){await i("plugin:store|set",{rid:this.rid,key:e,value:t})}async get(e){return await i("plugin:store|get",{rid:this.rid,key:e})}async has(e){return await i("plugin:store|has",{rid:this.rid,key:e})}async delete(e){return await i("plugin:store|delete",{rid:this.rid,key:e})}async clear(){await i("plugin:store|clear",{rid:this.rid})}async reset(){await i("plugin:store|reset",{rid:this.rid})}async keys(){return await i("plugin:store|keys",{rid:this.rid})}async values(){return await i("plugin:store|values",{rid:this.rid})}async entries(){return await i("plugin:store|entries",{rid:this.rid})}async length(){return await i("plugin:store|length",{rid:this.rid})}async load(){await i("plugin:store|load",{rid:this.rid})}async save(){await i("plugin:store|save",{rid:this.rid})}async onKeyChange(e,t){return await s("store://change",(r=>{r.payload.path===this.path&&r.payload.key===e&&t(r.payload.value)}))}async onChange(e){return await s("store://change",(t=>{t.payload.path===this.path&&e(t.payload.key,t.payload.value)}))}}return e.Store=o,e.createStore=async function(e,t){const r=await i("plugin:store|create_store",{path:e,...t});return new o(r,e)},e.getStore=async function(e){const t=await i("plugin:store|get_store");return t?new o(t,e):void 0},e}({});Object.defineProperty(window.__TAURI__,"store",{value:__TAURI_PLUGIN_STORE__})}
+if("__TAURI__"in window){var __TAURI_PLUGIN_STORE__=function(t){"use strict";var e,a;function r(t,e=!1){return window.__TAURI_INTERNALS__.transformCallback(t,e)}async function s(t,e={},a){return window.__TAURI_INTERNALS__.invoke(t,e,a)}"function"==typeof SuppressedError&&SuppressedError;class i{get rid(){return function(t,e,a,r){if("a"===a&&!r)throw new TypeError("Private accessor was defined without a getter");if("function"==typeof e?t!==e||!r:!e.has(t))throw new TypeError("Cannot read private member from an object whose class did not declare it");return"m"===a?r:"a"===a?r.call(t):r?r.value:e.get(t)}(this,e,"f")}constructor(t){e.set(this,void 0),function(t,e,a,r,s){if("function"==typeof e?t!==e||!s:!e.has(t))throw new TypeError("Cannot write private member to an object whose class did not declare it");e.set(t,a)}(this,e,t)}async close(){return s("plugin:resources|close",{rid:this.rid})}}async function n(t,e,a){const i={kind:"Any"};return s("plugin:event|listen",{event:t,target:i,handler:r(e)}).then((e=>async()=>async function(t,e){await s("plugin:event|unlisten",{event:t,eventId:e})}(t,e)))}async function o(t,e){return await u.createStore(t,e)}async function c(t){return await u.getStore(t)}e=new WeakMap,function(t){t.WINDOW_RESIZED="tauri://resize",t.WINDOW_MOVED="tauri://move",t.WINDOW_CLOSE_REQUESTED="tauri://close-requested",t.WINDOW_DESTROYED="tauri://destroyed",t.WINDOW_FOCUS="tauri://focus",t.WINDOW_BLUR="tauri://blur",t.WINDOW_SCALE_FACTOR_CHANGED="tauri://scale-change",t.WINDOW_THEME_CHANGED="tauri://theme-changed",t.WINDOW_CREATED="tauri://window-created",t.WEBVIEW_CREATED="tauri://webview-created",t.DRAG_ENTER="tauri://drag-enter",t.DRAG_OVER="tauri://drag-over",t.DRAG_DROP="tauri://drag-drop",t.DRAG_LEAVE="tauri://drag-leave"}(a||(a={}));class u extends i{constructor(t,e){super(t),this.path=e}static async createStore(t,e){const a=await s("plugin:store|create_store",{path:t,...e});return new u(a,t)}static async getStore(t){const e=await s("plugin:store|get_store");return e?new u(e,t):void 0}async set(t,e){await s("plugin:store|set",{rid:this.rid,key:t,value:e})}async get(t){return await s("plugin:store|get",{rid:this.rid,key:t})}async has(t){return await s("plugin:store|has",{rid:this.rid,key:t})}async delete(t){return await s("plugin:store|delete",{rid:this.rid,key:t})}async clear(){await s("plugin:store|clear",{rid:this.rid})}async reset(){await s("plugin:store|reset",{rid:this.rid})}async keys(){return await s("plugin:store|keys",{rid:this.rid})}async values(){return await s("plugin:store|values",{rid:this.rid})}async entries(){return await s("plugin:store|entries",{rid:this.rid})}async length(){return await s("plugin:store|length",{rid:this.rid})}async load(){await s("plugin:store|load",{rid:this.rid})}async save(){await s("plugin:store|save",{rid:this.rid})}async onKeyChange(t,e){return await n("store://change",(a=>{a.payload.path===this.path&&a.payload.key===t&&e(a.payload.value)}))}async onChange(t){return await n("store://change",(e=>{e.payload.path===this.path&&t(e.payload.key,e.payload.value)}))}}return t.LazyStore=class{constructor(t,e){this.path=t,this.options=e}get store(){return this._store||(this._store=o(this.path,this.options).catch((async()=>await c(this.path)))),this._store}async set(t,e){return(await this.store).set(t,e)}async get(t){return(await this.store).get(t)}async has(t){return(await this.store).has(t)}async delete(t){return(await this.store).delete(t)}async clear(){await(await this.store).clear()}async reset(){await(await this.store).reset()}async keys(){return(await this.store).keys()}async values(){return(await this.store).values()}async entries(){return(await this.store).entries()}async length(){return(await this.store).length()}async load(){await(await this.store).load()}async save(){await(await this.store).save()}async onKeyChange(t,e){return(await this.store).onKeyChange(t,e)}async onChange(t){return(await this.store).onChange(t)}async close(){this._store&&await(await this._store).close()}},t.Store=u,t.createStore=o,t.getStore=c,t}({});Object.defineProperty(window.__TAURI__,"store",{value:__TAURI_PLUGIN_STORE__})}

plugins/store/guest-js/index.ts

@@ -32,26 +32,110 @@ export async function createStore(
   path: string,
   options?: StoreOptions
 ): Promise<Store> {
-  const resourceId = await invoke<number>('plugin:store|create_store', {
-    path,
-    ...options
-  })
-  return new Store(resourceId, path)
+  return await Store.createStore(path, options)
 }
 
 /**
  * @param path: Path of the store in the rust side
  */
 export async function getStore(path: string): Promise<Store | undefined> {
-  const resourceId = await invoke<number | null>('plugin:store|get_store')
-  return resourceId ? new Store(resourceId, path) : undefined
+  return await Store.getStore(path)
+}
+
+/**
+ * A lazy loaded key-value store persisted by the backend layer.
+ *
+ * Note that the options are not applied if someone else already created the store
+ */
+export class LazyStore implements IStore {
+  private _store?: Promise<Store>
+  constructor(
+    private readonly path: string,
+    private readonly options?: StoreOptions
+  ) {}
+
+  public get store(): Promise<Store> {
+    if (!this._store) {
+      this._store = createStore(this.path, this.options).catch(
+        async () => (await getStore(this.path))!
+      )
+    }
+    return this._store
+  }
+
+  async set(key: string, value: unknown): Promise<void> {
+    return (await this.store).set(key, value)
+  }
+
+  async get<T>(key: string): Promise<T | null> {
+    return (await this.store).get<T>(key)
+  }
+
+  async has(key: string): Promise<boolean> {
+    return (await this.store).has(key)
+  }
+
+  async delete(key: string): Promise<boolean> {
+    return (await this.store).delete(key)
+  }
+
+  async clear(): Promise<void> {
+    await (await this.store).clear()
+  }
+
+  async reset(): Promise<void> {
+    await (await this.store).reset()
+  }
+
+  async keys(): Promise<string[]> {
+    return (await this.store).keys()
+  }
+
+  async values<T>(): Promise<T[]> {
+    return (await this.store).values<T>()
+  }
+
+  async entries<T>(): Promise<Array<[key: string, value: T]>> {
+    return (await this.store).entries<T>()
+  }
+
+  async length(): Promise<number> {
+    return (await this.store).length()
+  }
+
+  async load(): Promise<void> {
+    await (await this.store).load()
+  }
+
+  async save(): Promise<void> {
+    await (await this.store).save()
+  }
+
+  async onKeyChange<T>(
+    key: string,
+    cb: (value: T | null) => void
+  ): Promise<UnlistenFn> {
+    return (await this.store).onKeyChange<T>(key, cb)
+  }
+
+  async onChange<T>(
+    cb: (key: string, value: T | null) => void
+  ): Promise<UnlistenFn> {
+    return (await this.store).onChange<T>(cb)
+  }
+
+  async close(): Promise<void> {
+    if (this._store) {
+      await (await this._store).close()
+    }
+  }
 }
 
 /**
  * A key-value store persisted by the backend layer.
  */
-export class Store extends Resource {
-  constructor(
+export class Store extends Resource implements IStore {
+  private constructor(
     rid: number,
     private readonly path: string
   ) {
@@ -59,12 +143,30 @@ export class Store extends Resource {
   }
 
   /**
-   * Inserts a key-value pair into the store.
+   * @param path: Path to save the store in `app_data_dir`
+   * @param options: Store configuration options
    *
-   * @param key
-   * @param value
-   * @returns
+   * @throws If a store at that path already exists
    */
+  static async createStore(
+    path: string,
+    options?: StoreOptions
+  ): Promise<Store> {
+    const resourceId = await invoke<number>('plugin:store|create_store', {
+      path,
+      ...options
+    })
+    return new Store(resourceId, path)
+  }
+
+  /**
+   * @param path: Path of the store in the rust side
+   */
+  static async getStore(path: string): Promise<Store | undefined> {
+    const resourceId = await invoke<number | null>('plugin:store|get_store')
+    return resourceId ? new Store(resourceId, path) : undefined
+  }
+
   async set(key: string, value: unknown): Promise<void> {
     await invoke('plugin:store|set', {
       rid: this.rid,
@@ -73,12 +175,6 @@ export class Store extends Resource {
     })
   }
 
-  /**
-   * Returns the value for the given `key` or `null` the key does not exist.
-   *
-   * @param key
-   * @returns
-   */
   async get<T>(key: string): Promise<T | null> {
     return await invoke('plugin:store|get', {
       rid: this.rid,
@@ -86,12 +182,6 @@ export class Store extends Resource {
     })
   }
 
-  /**
-   * Returns `true` if the given `key` exists in the store.
-   *
-   * @param key
-   * @returns
-   */
   async has(key: string): Promise<boolean> {
     return await invoke('plugin:store|has', {
       rid: this.rid,
@@ -99,12 +189,6 @@ export class Store extends Resource {
     })
   }
 
-  /**
-   * Removes a key-value pair from the store.
-   *
-   * @param key
-   * @returns
-   */
   async delete(key: string): Promise<boolean> {
     return await invoke('plugin:store|delete', {
       rid: this.rid,
@@ -112,93 +196,38 @@ export class Store extends Resource {
     })
   }
 
-  /**
-   * Clears the store, removing all key-value pairs.
-   *
-   * Note: To clear the storage and reset it to it's `default` value, use `reset` instead.
-   * @returns
-   */
   async clear(): Promise<void> {
     await invoke('plugin:store|clear', { rid: this.rid })
   }
 
-  /**
-   * Resets the store to it's `default` value.
-   *
-   * If no default value has been set, this method behaves identical to `clear`.
-   * @returns
-   */
   async reset(): Promise<void> {
     await invoke('plugin:store|reset', { rid: this.rid })
   }
 
-  /**
-   * Returns a list of all key in the store.
-   *
-   * @returns
-   */
   async keys(): Promise<string[]> {
     return await invoke('plugin:store|keys', { rid: this.rid })
   }
 
-  /**
-   * Returns a list of all values in the store.
-   *
-   * @returns
-   */
   async values<T>(): Promise<T[]> {
     return await invoke('plugin:store|values', { rid: this.rid })
   }
 
-  /**
-   * Returns a list of all entries in the store.
-   *
-   * @returns
-   */
   async entries<T>(): Promise<Array<[key: string, value: T]>> {
     return await invoke('plugin:store|entries', { rid: this.rid })
   }
 
-  /**
-   * Returns the number of key-value pairs in the store.
-   *
-   * @returns
-   */
   async length(): Promise<number> {
     return await invoke('plugin:store|length', { rid: this.rid })
   }
 
-  /**
-   * Attempts to load the on-disk state at the stores `path` into memory.
-   *
-   * This method is useful if the on-disk state was edited by the user and you want to synchronize the changes.
-   *
-   * Note: This method does not emit change events.
-   * @returns
-   */
   async load(): Promise<void> {
     await invoke('plugin:store|load', { rid: this.rid })
   }
 
-  /**
-   * Saves the store to disk at the stores `path`.
-   *
-   * As the store is only persisted to disk before the apps exit, changes might be lost in a crash.
-   * This method lets you persist the store to disk whenever you deem necessary.
-   * @returns
-   */
   async save(): Promise<void> {
     await invoke('plugin:store|save', { rid: this.rid })
   }
 
-  /**
-   * Listen to changes on a store key.
-   * @param key
-   * @param cb
-   * @returns A promise resolving to a function to unlisten to the event.
-   *
-   * @since 2.0.0
-   */
   async onKeyChange<T>(
     key: string,
     cb: (value: T | null) => void
@@ -210,13 +239,6 @@ export class Store extends Resource {
     })
   }
 
-  /**
-   * Listen to changes on the store.
-   * @param cb
-   * @returns A promise resolving to a function to unlisten to the event.
-   *
-   * @since 2.0.0
-   */
   async onChange<T>(
     cb: (key: string, value: T | null) => void
   ): Promise<UnlistenFn> {
@@ -227,3 +249,129 @@ export class Store extends Resource {
     })
   }
 }
+
+interface IStore {
+  /**
+   * Inserts a key-value pair into the store.
+   *
+   * @param key
+   * @param value
+   * @returns
+   */
+  set(key: string, value: unknown): Promise<void>
+
+  /**
+   * Returns the value for the given `key` or `null` if the key does not exist.
+   *
+   * @param key
+   * @returns
+   */
+  get<T>(key: string): Promise<T | null>
+
+  /**
+   * Returns `true` if the given `key` exists in the store.
+   *
+   * @param key
+   * @returns
+   */
+  has(key: string): Promise<boolean>
+
+  /**
+   * Removes a key-value pair from the store.
+   *
+   * @param key
+   * @returns
+   */
+  delete(key: string): Promise<boolean>
+
+  /**
+   * Clears the store, removing all key-value pairs.
+   *
+   * Note: To clear the storage and reset it to its `default` value, use `reset` instead.
+   * @returns
+   */
+  clear(): Promise<void>
+
+  /**
+   * Resets the store to its `default` value.
+   *
+   * If no default value has been set, this method behaves identical to `clear`.
+   * @returns
+   */
+  reset(): Promise<void>
+
+  /**
+   * Returns a list of all keys in the store.
+   *
+   * @returns
+   */
+  keys(): Promise<string[]>
+
+  /**
+   * Returns a list of all values in the store.
+   *
+   * @returns
+   */
+  values<T>(): Promise<T[]>
+
+  /**
+   * Returns a list of all entries in the store.
+   *
+   * @returns
+   */
+  entries<T>(): Promise<Array<[key: string, value: T]>>
+
+  /**
+   * Returns the number of key-value pairs in the store.
+   *
+   * @returns
+   */
+  length(): Promise<number>
+
+  /**
+   * Attempts to load the on-disk state at the store's `path` into memory.
+   *
+   * This method is useful if the on-disk state was edited by the user and you want to synchronize the changes.
+   *
+   * Note: This method does not emit change events.
+   * @returns
+   */
+  load(): Promise<void>
+
+  /**
+   * Saves the store to disk at the store's `path`.
+   *
+   * As the store is only persisted to disk before the app's exit, changes might be lost in a crash.
+   * This method lets you persist the store to disk whenever you deem necessary.
+   * @returns
+   */
+  save(): Promise<void>
+
+  /**
+   * Listen to changes on a store key.
+   * @param key
+   * @param cb
+   * @returns A promise resolving to a function to unlisten to the event.
+   *
+   * @since 2.0.0
+   */
+  onKeyChange<T>(
+    key: string,
+    cb: (value: T | null) => void
+  ): Promise<UnlistenFn>
+
+  /**
+   * Listen to changes on the store.
+   * @param cb
+   * @returns A promise resolving to a function to unlisten to the event.
+   *
+   * @since 2.0.0
+   */
+  onChange<T>(cb: (key: string, value: T | null) => void): Promise<UnlistenFn>
+
+  /**
+   * Close the store and cleans up this resource from memory.
+   * **You should not call any method on this object anymore and should drop any reference to it.**
+   */
+  close(): Promise<void>
+}

plugins/store/src/store.rs

@@ -463,6 +463,9 @@ impl<R: Runtime> Store<R> {
         self.store.lock().unwrap().save()
     }
 
+    /// Removes the store from the resource table,
+    /// this doesn't remove other references of the same store held by you,
+    /// and the store is only truely closed once all reference held by you are also dropped
     pub fn close_store(self) {
         let store = self.store.lock().unwrap();
         let app = store.app.clone();