Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 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 | 1x 1x 1x 1x 1x 1x 3x 3x 3x 1x 93x 62x 62x 62x 62x 93x 3x 3x 3x 28x 28x 28x 28x 28x 28x 93x 93x 1x | import { Readable } from 'stream'
import { PaginationList } from './Transloadit'
type FetchPage<T> = (pageno: number) => PaginationList<T> | PromiseLike<PaginationList<T>>
export 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 { count, items } = await this._fetchPage(++this._pageno)
this._nitems = count
this._items = Array.from(items)
this._items.reverse()
this._read()
} catch (err) {
this.emit('error', err)
}
}
}
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