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quic: buffer stalls, as maxdata updates do not triggern an update of writeDesired sizes
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上游 issue 正文
ngtcp2 has no callback to inform us about an arrived maxdata frame.
If the buffering is only external and not within ngtcp2, this can cause a stall.
The equivalent for maxstreamdata is already addressed in https://github.com/nodejs/node/pull/64768 , as here ngtcp2 provides a callback.
Here is a reproduction code, based on the test of @pimterry for the PR of maxstreamdata:
```
// Flags: --experimental-quic --experimental-stream-iter --no-warnings
// Test: Quic maxdata updates on http/3
// Client sends a body that precisely fills the session window size,
// and verifies that it is data transfer is not stalled.
import { hasQuic, skip } from '../common/index.mjs';
import { readFile } from 'node:fs/promises';
import { setTimeout as sleep } from 'node:timers/promises';
if (!hasQuic) {
skip('QUIC is not enabled');
}
const { listen, connect } = await import('node:quic');
const { createPrivateKey } = await import('node:crypto');
const { drainableProtocol } = await import('stream/iter');
const keys = 'test/fixtures/keys';
const key = createPrivateKey(await readFile(`${keys}/agent1-key.pem`));
const cert = await readFile(`${keys}/agent1-cert.pem`);
const WINDOW = 4096;
// Fills the window exactly:
// considers all framing including some initial session capsules
const BODY = WINDOW - 38;
let letServerRead;
const serverMayRead = new Promise((resolve) => { letServerRead = resolve; });
const endpoint = await listen((session) => {
session.onstream = async (stream) => {
await serverMayRead;
// eslint-disable-next-line no-unused-vars
for await (const _ of stream) { /* reading extends the window */ }
};
}, {
sni: { '*': { keys: [key], certs: [cert] } },
transportParams: {
initialMaxStreamDataBidiRemote: 1024 * 1024, // make sure maxstreamdata does not block
initialMaxData: WINDOW,
},
onheaders() { this.sendHeaders({ ':status': '200' }); },
});
const session = await connect(endpoint.address, {
servername: 'localhost',
verifyPeer: 'manual',
});
a…
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