import forage from "localforage";
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import type { LocalForage, ProxyStorage, ExpiresData } from "./types.d";
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class StorageProxy implements ProxyStorage {
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protected storage: LocalForage;
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constructor(storageModel) {
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this.storage = storageModel;
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this.storage.config({
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// 首选IndexedDB作为第一驱动，不支持IndexedDB会自动降级到localStorage（WebSQL被弃用，详情看https://developer.chrome.com/blog/deprecating-web-sql）
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driver: [this.storage.INDEXEDDB, this.storage.LOCALSTORAGE],
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name: "pure-admin"
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});
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}
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/**
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* @description 将对应键名的数据保存到离线仓库
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* @param k 键名
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* @param v 键值
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* @param m 缓存时间（单位`分`，默认`0`分钟，永久缓存）
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*/
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public async setItem<T>(k: string, v: T, m = 0): Promise<T> {
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return new Promise((resolve, reject) => {
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this.storage
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.setItem(k, {
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data: v,
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expires: m ? new Date().getTime() + m * 60 * 1000 : 0
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})
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.then(value => {
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resolve(value.data);
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})
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.catch(err => {
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reject(err);
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});
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});
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}
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/**
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* @description 从离线仓库中获取对应键名的值
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* @param k 键名
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*/
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public async getItem<T>(k: string): Promise<T> {
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return new Promise((resolve, reject) => {
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this.storage
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.getItem(k)
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.then((value: ExpiresData<T>) => {
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value && (value.expires > new Date().getTime() || value.expires === 0)
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? resolve(value.data)
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: resolve(null);
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})
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.catch(err => {
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reject(err);
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});
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});
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}
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/**
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* @description 从离线仓库中删除对应键名的值
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* @param k 键名
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*/
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public async removeItem(k: string) {
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return new Promise<void>((resolve, reject) => {
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this.storage
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.removeItem(k)
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.then(() => {
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resolve();
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})
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.catch(err => {
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reject(err);
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});
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});
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}
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/**
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* @description 从离线仓库中删除所有的键名，重置数据库
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*/
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public async clear() {
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return new Promise<void>((resolve, reject) => {
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this.storage
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.clear()
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.then(() => {
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resolve();
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})
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.catch(err => {
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reject(err);
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});
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});
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}
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/**
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* @description 获取数据仓库中所有的key
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*/
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public async keys() {
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return new Promise<string[]>((resolve, reject) => {
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this.storage
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.keys()
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.then(keys => {
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resolve(keys);
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})
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.catch(err => {
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reject(err);
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});
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});
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}
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}
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/**
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* 二次封装 [localforage](https://localforage.docschina.org/) 支持设置过期时间，提供完整的类型提示
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*/
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export const localForage = () => new StorageProxy(forage);
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