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fix: Improve timeout handling during event loop lag #3418

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fix: Improve timeout handling during event loop lag #3418

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db66601
fix: Improve timeout handling during event loop lag
ronag Jul 24, 2024
afe3d6e
fixup
ronag Jul 24, 2024
cd0e6c0
Merge branch 'main' into event-loop-lag
metcoder95 Aug 12, 2024
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14 changes: 14 additions & 0 deletions lib/dispatcher/client-h1.js
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Original file line number Diff line number Diff line change
Expand Up @@ -158,6 +158,7 @@ class Parser {

this.bytesRead = 0

this.timeoutDeadline = 0
this.keepAlive = ''
this.contentLength = ''
this.connection = ''
Expand All @@ -170,6 +171,8 @@ class Parser {
timers.clearTimeout(this.timeout)
if (value) {
this.timeout = timers.setTimeout(onParserTimeout, value, this)
this.timeoutDeadline = this.timeoutValue ? Date.now() + this.timeoutValue : 0

// istanbul ignore else: only for jest
if (this.timeout.unref) {
this.timeout.unref()
Expand All @@ -182,10 +185,17 @@ class Parser {
// istanbul ignore else: only for jest
if (this.timeout.refresh) {
this.timeout.refresh()
this.timeoutDeadline = this.timeoutValue ? Date.now() + this.timeoutValue : 0
}
}
}

updateTimeout () {
if (this.timeoutDeadline && this.timeoutDeadline < Date.now()) {
onParserTimeout(this)
}
Comment on lines +194 to +196
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@ronag ronag Jul 24, 2024 •
edited
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This will call Date.now() quite often... which is not optimal performance-wise. However, I don't see a smart way around it without using a worker as the point is to detect event loop lag before dispatching further events.

}

resume () {
if (this.socket.destroyed || !this.paused) {
return
Expand Down Expand Up @@ -615,6 +625,8 @@ class Parser {
function onParserTimeout (parser) {
const { socket, timeoutType, client } = parser

parser.timeoutDeadline = 0

/* istanbul ignore else */
if (timeoutType === TIMEOUT_HEADERS) {
if (!socket[kWriting] || socket.writableNeedDrain || client[kRunning] > 1) {
Expand Down Expand Up @@ -815,6 +827,8 @@ function resumeH1 (client) {
socket[kParser].setTimeout(headersTimeout, TIMEOUT_HEADERS)
}
}

socket[kParser].updateTimeout()
}
}

Expand Down
4 changes: 2 additions & 2 deletions lib/util/timers.js
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Original file line number Diff line number Diff line change
Expand Up @@ -2,13 +2,13 @@

const TICK_MS = 499

let fastNow = Date.now()
let fastNow = 0
let fastNowTimeout

const fastTimers = []

function onTimeout () {
fastNow = Date.now()
fastNow += TICK_MS

let len = fastTimers.length
let idx = 0
Expand Down