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import Dexie from 'dexie'
import { databaseId } from '@/store/main'
import type { Slide } from '@/types/slides'
import { LOCALSTORAGE_KEY_DISCARDED_DB } from '@/configs/storage'
export interface writingBoardImg {
id: string
dataURL: string
}
export interface Snapshot {
index: number
slides: Slide[]
}
const databaseNamePrefix = 'PPTist'
// 删除失效/过期的数据库
// 应用关闭时(关闭或刷新浏览器),会将其数据库ID记录在 localStorage 中,表示该ID指向的数据库已失效
// 当应用初始化时,检查当前所有数据库,将被记录失效的数据库删除
// 另外,距离初始化时间超过12小时的数据库也将被删除(这是为了防止出现因意外未被正确删除的库)
export const deleteDiscardedDB = async () => {
const now = new Date().getTime()
const localStorageDiscardedDB = localStorage.getItem(LOCALSTORAGE_KEY_DISCARDED_DB)
const localStorageDiscardedDBList: string[] = localStorageDiscardedDB ? JSON.parse(localStorageDiscardedDB) : []
const databaseNames = await Dexie.getDatabaseNames()
const discardedDBNames = databaseNames.filter(name => {
if (name.indexOf(databaseNamePrefix) === -1) return false
const [prefix, id, time] = name.split('_')
if (prefix !== databaseNamePrefix || !id || !time) return true
if (localStorageDiscardedDBList.includes(id)) return true
if (now - (+time) >= 1000 * 60 * 60 * 12) return true
return false
})
for (const name of discardedDBNames) Dexie.delete(name)
localStorage.removeItem(LOCALSTORAGE_KEY_DISCARDED_DB)
}
class PPTistDB extends Dexie {
public snapshots: Dexie.Table<Snapshot, number>
public writingBoardImgs: Dexie.Table<writingBoardImg, number>
public constructor() {
super(`${databaseNamePrefix}_${databaseId}_${new Date().getTime()}`)
this.version(1).stores({
snapshots: '++id',
writingBoardImgs: '++id',
})
this.snapshots = this.table('snapshots')
this.writingBoardImgs = this.table('writingBoardImgs')
}
}
export const db = new PPTistDB()