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feat(streams): buffer pull only once data has been written #3982

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feat(streams): buffer pull only once data has been written #3982

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22b2a66
buffer pull only once data has been written
crowlKats Dec 18, 2023
eeec967
handle constructor set data
crowlKats Dec 18, 2023
a213222
fix
crowlKats Dec 18, 2023
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22 changes: 19 additions & 3 deletions streams/buffer.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -24,9 +24,16 @@ const DEFAULT_CHUNK_SIZE = 16_640;
export class Buffer {
#buf: Uint8Array; // contents are the bytes buf[off : len(buf)]
#off = 0; // read at buf[off], write at buf[buf.byteLength]
#startedPromise = Promise.withResolvers();
#startedBool = false;
#readable: ReadableStream<Uint8Array> = new ReadableStream({
type: "bytes",
pull: (controller) => {
pull: async (controller) => {
if (!this.#startedBool) {
await this.#startedPromise.promise;
this.#startedBool = true;
}

const view = new Uint8Array(controller.byobRequest!.view!.buffer);
if (this.empty()) {
// Buffer is empty, reset to recover space.
Expand All @@ -37,7 +44,9 @@ export class Buffer {
}
const nread = copy(this.#buf.subarray(this.#off), view);
this.#off += nread;
controller.byobRequest!.respond(nread);
if (nread !== 0) {
controller.byobRequest!.respond(nread);
}
},
autoAllocateChunkSize: DEFAULT_CHUNK_SIZE,
});
Expand All @@ -51,6 +60,7 @@ export class Buffer {
write: (chunk) => {
const m = this.#grow(chunk.byteLength);
copy(chunk, this.#buf, m);
this.#startedPromise.resolve(undefined);
},
});

Expand All @@ -61,7 +71,13 @@ export class Buffer {

/** Constructs a new instance. */
constructor(ab?: ArrayBufferLike | ArrayLike<number>) {
this.#buf = ab === undefined ? new Uint8Array(0) : new Uint8Array(ab);
if (ab === undefined) {
this.#buf = new Uint8Array(0);
} else {
this.#buf = new Uint8Array(ab);
this.#startedBool = true;
this.#startedPromise.resolve(undefined);
}
}

/** Returns a slice holding the unread portion of the buffer.
Expand Down