cf91d181fb
Signed-off-by: James M Snell <jasnell@gmail.com> Assisted-by: Opencode:Opus 4.6 PR-URL: https://github.com/nodejs/node/pull/62876 Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Filip Skokan <panva.ip@gmail.com> Reviewed-By: Paolo Insogna <paolo@cowtech.it> Reviewed-By: Robert Nagy <ronagy@icloud.com>
58 lines
1.8 KiB
JavaScript
58 lines
1.8 KiB
JavaScript
// Flags: --experimental-quic --experimental-stream-iter --no-warnings
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// Test: slow consumer applies backpressure.
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// With a small flow control window and a large body, the sender
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// blocks waiting for the receiver to extend the window. The transfer
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// completes when the receiver reads the data.
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import { hasQuic, skip, mustCall, mustCallAtLeast } from '../common/index.mjs';
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import assert from 'node:assert';
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const { ok, strictEqual } = assert;
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if (!hasQuic) {
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skip('QUIC is not enabled');
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}
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const { listen, connect } = await import('../common/quic.mjs');
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const { bytes } = await import('stream/iter');
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const dataLength = 4096;
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const serverDone = Promise.withResolvers();
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const serverEndpoint = await listen(mustCall((serverSession) => {
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serverSession.onstream = mustCall(async (stream) => {
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const received = await bytes(stream);
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strictEqual(received.byteLength, dataLength);
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stream.writer.endSync();
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await stream.closed;
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serverSession.close();
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serverDone.resolve();
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});
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}), {
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// Small stream window forces the sender to block repeatedly.
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transportParams: { initialMaxStreamDataBidiRemote: 256 },
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});
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const clientSession = await connect(serverEndpoint.address);
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await clientSession.opened;
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let blockedCount = 0;
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const stream = await clientSession.createBidirectionalStream();
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// The actual number of blocks can vary on a range of factors. We're
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// only validating that blocking occurs at least once.
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stream.onblocked = mustCallAtLeast(() => {
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blockedCount++;
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}, 1);
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stream.setBody(new Uint8Array(dataLength));
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for await (const _ of stream) { /* drain */ } // eslint-disable-line no-unused-vars
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await Promise.all([stream.closed, serverDone.promise]);
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// The sender should have been blocked multiple times.
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ok(blockedCount > 0, `Expected blocking, got ${blockedCount}`);
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await clientSession.closed;
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await serverEndpoint.close();
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