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Module

std/io/reader_from_stream_reader.ts

The Deno Standard Library
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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.
import { Buffer } from "./buffer.ts";import { writeAll } from "./write_all.ts";import type { Reader } from "./types.ts";
/** * Create a {@linkcode Reader} from a {@linkcode ReadableStreamDefaultReader}. * * @example * ```ts * import { copy } from "https://deno.land/std@$STD_VERSION/io/copy.ts"; * import { readerFromStreamReader } from "https://deno.land/std@$STD_VERSION/io/reader_from_stream_reader.ts"; * * const res = await fetch("https://deno.land"); * using file = await Deno.open("./deno.land.html", { create: true, write: true }); * * const reader = readerFromStreamReader(res.body!.getReader()); * await copy(reader, file); * ``` */export function readerFromStreamReader( streamReader: ReadableStreamDefaultReader<Uint8Array>,): Reader { const buffer = new Buffer();
return { async read(p: Uint8Array): Promise<number | null> { if (buffer.empty()) { const res = await streamReader.read(); if (res.done) { return null; // EOF }
await writeAll(buffer, res.value); }
return buffer.read(p); }, };}