53 lines
2.2 KiB
TypeScript
53 lines
2.2 KiB
TypeScript
// 未成功保存到服务器的内容暂存在 IndexedDB，供下次启动时恢复
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export interface Draft {
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path: string
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content: string
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// 本地修改所基于的服务器版本；新建文件时为空字符串
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baseRev: string
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updatedAt: number
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}
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let dbPromise: Promise<IDBDatabase> | undefined
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function db(): Promise<IDBDatabase> {
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dbPromise ??= new Promise((resolve, reject) => {
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const req = indexedDB.open('rawmark', 1)
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req.onupgradeneeded = () => req.result.createObjectStore('drafts', { keyPath: 'path' })
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req.onsuccess = () => resolve(req.result)
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req.onerror = () => reject(req.error)
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})
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return dbPromise
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}
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async function tx<T>(mode: IDBTransactionMode, fn: (store: IDBObjectStore) => IDBRequest<T>): Promise<T> {
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const transaction = (await db()).transaction('drafts', mode)
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return new Promise((resolve, reject) => {
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const req = fn(transaction.objectStore('drafts'))
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transaction.oncomplete = () => resolve(req.result)
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transaction.onabort = () => reject(transaction.error ?? new Error('本地草稿事务已中止'))
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req.onerror = () => reject(req.error)
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})
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}
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export const drafts = {
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put: (d: Draft) => tx('readwrite', s => s.put(d)),
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delete: (path: string) => tx('readwrite', s => s.delete(path)),
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all: () => tx<Draft[]>('readonly', s => s.getAll()),
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async move(from: string, to: string): Promise<void> {
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const transaction = (await db()).transaction('drafts', 'readwrite')
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return new Promise((resolve, reject) => {
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const store = transaction.objectStore('drafts')
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const request: IDBRequest<Draft[]> = store.getAll()
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request.onsuccess = () => {
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const moving = request.result.filter(draft => draft.path === from || draft.path.startsWith(`${from}/`))
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for (const draft of moving) store.delete(draft.path)
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// add 遇到目标路径已有草稿时中止整个事务，不能覆盖另一份未保存内容。
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for (const draft of moving) store.add({ ...draft, path: to + draft.path.slice(from.length) })
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}
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transaction.oncomplete = () => resolve()
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transaction.onabort = () => reject(new Error('迁移本地草稿事务失败', { cause: transaction.error }))
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})
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},
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}
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