vue-django/src/utils/user_storage.js

个人实验项目, 本框架的目标是借鉴并超越django admin的自动化思想, 实现UI前端的极简快速定制开发

/**
 * Created by denishuang on 2020/4/21.
 */

import low from 'lowdb'
import LocalStorage from 'lowdb/adapters/LocalStorage'

export function Cache (key, db) {
    return {
        db,
        save (v) {
            try {
                db.set(key, v).write()
            } catch (e) {
                alert(e.toString())
            }
        },
        read (k) {
            return db.get(k || key).value()
        },
        destroy () {
            console.log('destroy', key)
            try {
                db.unset(key).write()
            } catch (e) {
                alert(e.toString())
            }
        }
    }
}

export function BCache (key, db) {
    function changeKey (k) {
        let ps = k.split('.')
        ps[2] = ps[2].replace(/^n/, '')
        return ps.join('.')
    }

    let cache = Cache(key, db)
    return {
        ...cache,
        read (k) {
            return cache.read(k) || JSON.parse(localStorage.getItem(changeKey(k || key)))
        }
    }
}

export default BCache

export function UserStorage (key) {
    if (key === undefined) {
        key = 'userStore'
    }
    if (Number.isInteger(key)) {
        key = `userStore${key}`
    }
    let adapter = new LocalStorage(key)
    let db = low(adapter)
    return {
        db,
        newCache: function (key) {
            return BCache(key, db)
        }
    }
}