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fix(relay): keep bulk streaming from blocking client requests

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Negotiate downstream delivery credit and schedule response streams fairly before encryption. Bound queued output, preserve deltas and WebSocket close ordering, and retain legacy peer compatibility.

Validated with 81 relay tests, workspace type-check and lint, web build and mobile assets, and slow-link tests through the production relay. Confirmed on LTE by the maintainer.
This commit is contained in:
Bohdan Triapitsyn
2026-09-09 17:41:14 +03:00
parent 4d8148587c
commit af84735388
13 changed files with 761 additions and 58 deletions
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packages/web/server/lib/relay/e2ee.js
+10 -8
View File
@@ -252,11 +252,12 @@ const parseHandshakeMessage = (raw) => {
if (parsed.v !== RELAY_PROTOCOL_VERSION) return null;
// Unknown/missing capability flag = false = legacy behavior.
const batch = parsed.batch === true;
const flowControl = parsed.flowControl === true;
if (parsed.t === 'ready') {
return { t: 'ready', v: RELAY_PROTOCOL_VERSION, batch };
return { t: 'ready', v: RELAY_PROTOCOL_VERSION, batch, flowControl };
}
if (parsed.t === 'hello' && typeof parsed.nonce === 'string' && typeof parsed.clientPubJwk === 'object' && parsed.clientPubJwk !== null) {
return { t: 'hello', v: RELAY_PROTOCOL_VERSION, clientPubJwk: parsed.clientPubJwk, nonce: parsed.nonce, batch };
return { t: 'hello', v: RELAY_PROTOCOL_VERSION, clientPubJwk: parsed.clientPubJwk, nonce: parsed.nonce, batch, flowControl };
}
return null;
};
@@ -275,7 +276,7 @@ const failClosed = (reason) => ({
* { type: 'ignore' } — drop the frame
* { type: 'fail', closeCode, reason } — close the socket with closeCode
* @param {CryptoKey} hostEncPrivateKey long-lived ECDH private key
* @param {{ batch?: boolean }} [options] `batch` defaults true; set false to force legacy behavior
* @param {{ batch?: boolean, flowControl?: boolean }} [options] Capabilities default true.
*/
export const createHostHandshake = (hostEncPrivateKey, options = {}) => {
const localBatch = options.batch !== false;
@@ -321,15 +322,16 @@ export const createHostHandshake = (hostEncPrivateKey, options = {}) => {
acceptedClientKeyFingerprint = fingerprint;
// Batching runs only if both peers advertised it.
negotiatedBatch = localBatch && message.batch === true;
readyText = JSON.stringify(
negotiatedBatch
? { t: 'ready', v: RELAY_PROTOCOL_VERSION, batch: true }
: { t: 'ready', v: RELAY_PROTOCOL_VERSION },
);
const flowControl = options.flowControl !== false && message.flowControl === true;
const ready = { t: 'ready', v: RELAY_PROTOCOL_VERSION };
if (negotiatedBatch) ready.batch = true;
if (flowControl) ready.flowControl = true;
readyText = JSON.stringify(ready);
established = true;
return {
type: 'established',
batch: negotiatedBatch,
flowControl,
replyText: readyText,
channel: {
encryptor: createFrameEncryptor(keys.hostToClient),