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| import * as fs from 'fs-extra';
import * as path from 'path';
import * as crypto from 'crypto';
class Store<T extends Record<string, any> = Record<string, unknown>> {
private _dirName: string;
private _fileName: string;
private _useDot: boolean = true;
private _fileEnc?: {
iv: Buffer;
key: Buffer;
algo: crypto.CipherGCMTypes;
};
private _json: T = {} as T;
constructor(opts: {
dirName: string;
fileName: string;
useDot?: boolean;
fileEncKey?: string;
}) {
this._dirName = opts.dirName;
this._fileName = opts.fileName;
if (typeof opts.useDot === 'boolean') {
this._useDot = opts.useDot;
}
if (opts.fileEncKey) {
const iv = crypto.randomBytes(16);
const key = crypto.pbkdf2Sync(opts.fileEncKey, iv, 10000, 32, 'sha512');
this._fileEnc = {
algo: 'aes-256-gcm',
key, iv
};
}
const filepath = path.join(this._dirName, this._fileName);
if (fs.existsSync(filepath)) {
try {
if (opts.fileEncKey) {
const _buf = fs.readFileSync(filepath);
const _iv = _buf.slice(0, 16);
const _key = crypto.pbkdf2Sync(opts.fileEncKey, _iv, 10000, 32, 'sha512');
const _authTag = _buf.slice(-16);
const decipher = crypto.createDecipheriv(this._fileEnc!.algo, _key, _iv);
decipher.setAuthTag(_authTag);
this._json = JSON.parse(Buffer.concat([decipher.update(_buf.slice(16, -16)), decipher.final()]).toString('utf-8'));
} else {
this._json = JSON.parse(fs.readFileSync(filepath, {
encoding: 'utf8'
}));
}
} catch (_) { }
} else {
if (!fs.existsSync(this._dirName)) {
fs.ensureDirSync(this._dirName);
}
}
}
data(format: 'string' | 'format-string'): string;
data(format?: 'object'): T;
data(format?: 'string' | 'format-string' | 'object') {
switch (format) {
case 'string':
return JSON.stringify(this._json);
case 'format-string':
return JSON.stringify(this._json, undefined, 4);
case 'object':
default:
return this._json;
}
}
get<K extends keyof T>(key: K) {
return this._json[key] || {} as T[K];
}
set<K extends keyof T>(key: K, value: T[K]) {
if (this._useDot) {
const sp = key.toString().split('.');
if (sp.length === 1) {
this._json[key] = value;
} else if (sp.length > 1) {
let obj: any = this._json;
for (let k of sp.slice(0, -1)) {
if (!(obj[k] && typeof obj[k] === 'object')) {
obj[k] = {};
}
obj = obj[k];
}
obj[sp[sp.length - 1]] = value;
}
} else {
this._json[key] = value;
}
if (this._fileEnc) {
const cipher = crypto.createCipheriv(this._fileEnc.algo, this._fileEnc.key, this._fileEnc.iv);
const writeBuffer = Buffer.concat([this._fileEnc.iv, cipher.update(Buffer.from(this.data('string'))), cipher.final(), cipher.getAuthTag()]);
fs.writeFileSync(path.join(this._dirName, this._fileName), writeBuffer);
} else {
fs.writeFileSync(path.join(this._dirName, this._fileName), JSON.stringify(this._json, undefined, 4));
}
}
clear(delFile = false) {
this._json = {} as T;
if (delFile) {
const filepath = path.join(this._dirName, this._fileName);
if (fs.existsSync(filepath)) {
fs.unlinkSync(filepath);
}
}
}
}
const s = new Store({
dirName: __dirname,
fileName: 'store.dat',
fileEncKey: '123456'
});
const count = 20;
let sum = 0;
for (let i = 0; i < count; i++) {
const t = Date.now();
for (let i = 0; i < 1000; i++) {
s.set('a.b.c', 'ccc');
}
sum += Date.now() - t;
}
console.log(`${sum / count}ms`);
|