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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 | 1x 1x 1x 1x 1x 1x 3x 3x 3x 1x 540x 360x 360x 360x 360x 540x 3x 3x 3x 177x 177x 177x 177x 177x 177x 177x 177x 540x 540x 1x | import { Readable } from 'stream'
import { PaginationList, PaginationListWithCount } from './apiTypes'
// eslint-disable-next-line no-unused-vars
type FetchPage<T> = (
pageno: number
) =>
| PaginationList<T>
| PromiseLike<PaginationList<T>>
| PaginationListWithCount<T>
| PromiseLike<PaginationListWithCount<T>>
export default class PaginationStream<T> extends Readable {
private _fetchPage: FetchPage<T>
private _nitems?: number
private _pageno = 0
private _items: T[] = []
private _itemsRead = 0
constructor(fetchPage: FetchPage<T>) {
super({ objectMode: true })
this._fetchPage = fetchPage
}
override async _read() {
if (this._items.length > 0) {
this._itemsRead++
process.nextTick(() => this.push(this._items.pop()))
return
}
if (this._nitems != null && this._itemsRead >= this._nitems) {
process.nextTick(() => this.push(null))
return
}
try {
const { items, ...rest } = await this._fetchPage(++this._pageno)
if ('count' in rest) {
this._nitems = rest.count
}
this._items = Array.from(items)
this._items.reverse()
this._read()
} catch (err) {
this.emit('error', err)
}
}
}
|