cooperation/db/lowdb.js

用于多人合作模化开发

const path = require('path');
const fs = require('fs-extra');
const low = require('lowdb');
const FileAsync = require('lowdb/adapters/FileAsync');
const Cryptr = require("cryptr");
const log = require('cooperation/util/log');
const cryptr = new Cryptr('Zoolon');

const NAME = path.basename(__filename, '.js');

const dbStory = new Map();

function conn({dev = false, dbs = []} = {}) {
    dbs.forEach(v => {
        let name = path.basename(v, '.db');
        if (dbStory.has(name)) {
            log("名为" + name + "数据库链接已建立", "WARN");
            return;
        }
        try {
            //自动初始化
            fs.ensureFileSync(v);
            //获取加密连接
            let cryptrImpl = dev ? {} : {
                //实现加密接口
                serialize: data => cryptr.encrypt(JSON.stringify(data)),
                //实现解密接口
                deserialize: data => JSON.parse(cryptr.decrypt(data))
            };

            low(new FileAsync(v, cryptrImpl)).then(db => dbStory.set(name, db));
            console.log(NAME + ":使用了 " + v + " 数据库文件");
        } catch (e) {
            log("数据库连接异常！", "ERROR");
        }
    });
}

module.exports = {
    conn,
    use: name => dbStory.get(name)
};