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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
/** Create a `Writer` from a `WritableStreamDefaultReader`. */
export function writerFromStreamWriter(
streamWriter: WritableStreamDefaultWriter<Uint8Array>,
): Deno.Writer {
return {
async write(p: Uint8Array): Promise<number> {
await streamWriter.ready;
await streamWriter.write(p);
return p.length;
},
};
}
/** Create a `Reader` from a `ReadableStreamDefaultReader`. */
export function readerFromStreamReader(
streamReader: ReadableStreamDefaultReader<Uint8Array>,
): Deno.Reader {
const buffer = new Deno.Buffer();
return {
async read(p: Uint8Array): Promise<number | null> {
if (buffer.empty()) {
const res = await streamReader.read();
if (res.done) {
return null; // EOF
}
await Deno.writeAll(buffer, res.value);
}
return buffer.read(p);
},
};
}
/** Create a `WritableStream` from a `Writer`. */
export function writableStreamFromWriter(
writer: Deno.Writer,
): WritableStream<Uint8Array> {
return new WritableStream({
async write(chunk) {
await Deno.writeAll(writer, chunk);
},
});
}
/** Create a `ReadableStream` from an `AsyncIterator`. */
export function readableStreamFromAsyncIterator<T>(
iterator: AsyncIterableIterator<T>,
): ReadableStream<T> {
return new ReadableStream({
async pull(controller) {
const { value, done } = await iterator.next();
if (done) {
controller.close();
} else {
controller.enqueue(value);
}
},
});
}
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