118 lines
3.3 KiB
TypeScript
118 lines
3.3 KiB
TypeScript
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import TypeTools, { TYPES } from './type-tools';
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class StorageData {
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data: any;
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type: string;
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timeout: number;
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constructor(data: any, type: string, timeout: number) {
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this.data = data;
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this.type = type;
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this.timeout = timeout;
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}
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/**
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* 判断缓存是否过期
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*/
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isExpired(): boolean {
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if (!this.timeout) return false;
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return new Date().getTime() > this.timeout;
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}
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getData(): any {
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if(this.type === TYPES.DATE){
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return new Date(parseInt(this.data));
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}else if(this.type== TYPES.OBJ || this.type== TYPES.ARRAY){
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return JSON.parse(this.data);
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}else if(this.type== TYPES.REGEXP){
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return new RegExp(this.data.pattern, this.data.flags);
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}else if(this.type== TYPES.BOOLEAN){
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return this.data === 'true';
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}else if(this.type== TYPES.NUMBER){
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return new Number(this.data);
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}else if(this.type== TYPES.STRING){
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return this.data;
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}
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return this.data;
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}
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static fromData(data: any,timeout?: number): StorageData {
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if(timeout==undefined) timeout = new Date().getTime() + 600000; // Default timeout to 10 minutes from now
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let type = TypeTools.parseType(data);
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if(type === TYPES.UNKNOWN ||type== TYPES.FUNCTION || type== TYPES.JSON){
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throw new Error('错误的数据类型，不能保存');
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}
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let sdata = data;
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if(type === TYPES.DATE){
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sdata = data.getTime();
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}else if(type== TYPES.OBJ || type== TYPES.ARRAY){
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sdata = JSON.stringify(data);
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}else if(type== TYPES.REGEXP){
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sdata = JSON.stringify({
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pattern: data.pattern,
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flags: data.flags
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});
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}
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return new StorageData(sdata,type,timeout);
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}
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static fromJSON(json: string): StorageData {
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const data = JSON.parse(json);
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return new StorageData(data.data,data.type,parseInt(data.timeout));
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}
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}
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const TStorage = {
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TIME:{SECOND:1000,MINUTE:60000,HOUR:3600000,DAY:86400000},
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timeOf(type: number,total:number): number {
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return type*total;
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},
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set(key: string, data: any, timeout: number = 0) {
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const storageData = StorageData.fromData(data,timeout);
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localStorage.setItem(key, JSON.stringify(storageData));
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},
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get(key: string,timeout?:number) {
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const sData = localStorage.getItem(key);
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if (sData) {
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const data = StorageData.fromJSON(sData);
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if (data.isExpired()) {
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if(timeout && timeout > 0){
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data.timeout = new Date().getTime() + timeout;
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localStorage.setItem(key,JSON.stringify(data));
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}else{
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localStorage.removeItem(key);
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return null;
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}
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}
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return data.getData();
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}
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return null;
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}
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}
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export async function cache<T>(key:string, timeout: number = 0, promise: Promise<T>):Promise<T>{
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return new Promise((resolve, reject) => {
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const cachedData = TStorage.get(key,timeout);
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if (cachedData!=undefined) {
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resolve(cachedData);
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} else {
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promise.then((data) => {
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TStorage.set(key, data, timeout);
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resolve(data);
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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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export default TStorage;
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