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perf(http): 修复响应日期格式化每次重建 ICU formatter 导致的 CPU 热点

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formatResponseDateTime 在函数内部 `new Intl.DateTimeFormat(...)`，而
buildSuccessPayload 会对每个成功响应的每个日期字段调用它。ICU formatter
单次构造约 0.5~0.8ms，V8 CPU 采样显示该函数占后端主线程约 30% CPU（约 0.33 核）。

改动：
- formatter 提到模块级只构造一次；formatToParts 直取字段，去掉
  Object.fromEntries + filter + map 的三次分配
- isIsoDateTimeString 增加 O(1) 位置预判，避免对每个字段值跑正则
- normalizeResponseDateTime 用显式循环替代 entries/fromEntries 双重分配
- 同类问题一并修复：open-91 formatOpen91ExpireTime、redeem formatGrantTime

输出逐字节一致：新增等价性测试，以修复前实现为参考覆盖跨时区/毫秒/
闰日/跨年/非法日期语料。同形态响应（200 行 × 6 日期字段）实测
35.2ms → 2.6ms（13.6x）。
This commit is contained in:
yml2213
2026-10-30 21:20:11 +08:00
parent fb485f7e36
commit 14b595b0db
4 changed files with 246 additions and 48 deletions
Download Patch File Download Diff File Expand all files Collapse all files
apps/backend/src/services/open-91/response.ts
+20 -11
View File
@@ -3,6 +3,21 @@ import { OPEN_91_DEFAULT_FAIL_CODE, OPEN_91_SUCCESS_MESSAGE } from './config.js'
import { isOpen91FailedTaskStatus } from '../../domain/task-status.js'
import { normalizeOpen91String } from './payload.js'
/**
* 模块级只构造一次：`new Intl.DateTimeFormat()` 每次都会重新装载 ICU locale 数据，
* 单次约 0.5ms。该格式化器按响应字段逐条调用，放在函数内会随响应行数线性放大。
*/
const OPEN_91_EXPIRE_FORMATTER = new Intl.DateTimeFormat('zh-CN', {
timeZone: 'Asia/Shanghai',
year: 'numeric',
month: '2-digit',
day: '2-digit',
hour: '2-digit',
minute: '2-digit',
second: '2-digit',
hourCycle: 'h23',
})
export function buildOpen91SuccessResponse(data: unknown, message = OPEN_91_SUCCESS_MESSAGE) {
return {
code: 200,
@@ -57,18 +72,12 @@ export function formatOpen91ExpireTime(value: unknown = '') {
return normalized
}
const parts = new Intl.DateTimeFormat('zh-CN', {
timeZone: 'Asia/Shanghai',
year: 'numeric',
month: '2-digit',
day: '2-digit',
hour: '2-digit',
minute: '2-digit',
second: '2-digit',
hourCycle: 'h23',
}).formatToParts(date)
const parts = OPEN_91_EXPIRE_FORMATTER.formatToParts(date)
const byType = Object.fromEntries(parts.map((part) => [part.type, part.value]))
const byType: Record<string, string> = {}
for (const part of parts) {
if (part.type !== 'literal') byType[part.type] = part.value
}
return `${byType.year}-${byType.month}-${byType.day} ${byType.hour}:${byType.minute}:${byType.second}`
}
apps/backend/src/services/redeem/certificate-service.ts
+20 -12
View File
@@ -842,6 +842,20 @@ export async function findCertificateOrThrow(certNo: string): Promise<RedeemCert
return row
}
/**
* 模块级只构造一次：`new Intl.DateTimeFormat()` 每次都会重新装载 ICU locale 数据，
* 单次约 0.5ms。凭证按条签发/查询时会逐条调用 formatGrantTime，放在函数内会线性放大。
*/
const GRANT_TIME_FORMATTER = new Intl.DateTimeFormat('zh-CN', {
timeZone: 'Asia/Shanghai',
year: 'numeric',
month: '2-digit',
day: '2-digit',
hour: '2-digit',
minute: '2-digit',
second: '2-digit',
})
/** 平台的 grant_time 形如 `YYYY-MM-DD HH:MM:SS`（北京时间）。 */
export function formatGrantTime(iso: string): string {
const date = new Date(iso)
@@ -849,18 +863,12 @@ export function formatGrantTime(iso: string): string {
return ''
}
const parts = new Intl.DateTimeFormat('zh-CN', {
timeZone: 'Asia/Shanghai',
year: 'numeric',
month: '2-digit',
day: '2-digit',
hour: '2-digit',
minute: '2-digit',
second: '2-digit',
}).formatToParts(date)
const parts = GRANT_TIME_FORMATTER.formatToParts(date)
const pick = (type: Intl.DateTimeFormatPartTypes) =>
parts.find((part) => part.type === type)?.value || ''
const byType: Record<string, string> = {}
for (const part of parts) {
if (part.type !== 'literal') byType[part.type] = part.value
}
return `${pick('year')}-${pick('month')}-${pick('day')} ${pick('hour')}:${pick('minute')}:${pick('second')}`
return `${byType.year}-${byType.month}-${byType.day} ${byType.hour}:${byType.minute}:${byType.second}`
}
apps/backend/src/utils/http.test.ts
+134 -1
View File
@@ -1,7 +1,12 @@
import assert from 'node:assert/strict'
import test from 'node:test'
import { buildErrorPayload, createHttpError, resolveRouteErrorLogLevel } from './http.js'
import {
buildErrorPayload,
buildSuccessPayload,
createHttpError,
resolveRouteErrorLogLevel,
} from './http.js'
test('expected worker session expiry is debug-level', () => {
assert.equal(
@@ -33,3 +38,131 @@ test('generic 5xx still uses fallback message', () => {
const payload = buildErrorPayload(error, '服务内部错误')
assert.equal(payload.msg, '服务内部错误')
})
// ---------------------------------------------------------------------------
// 响应日期格式化：格式必须与旧实现逐字节一致，同时不能再每次构造 ICU formatter。
// ---------------------------------------------------------------------------
/** 修复前的实现，作为等价性比对的参考实现。 */
function legacyFormatResponseDateTime(value: string): string {
const date = new Date(value)
if (Number.isNaN(date.getTime())) {
return String(value || '')
.replace('T', ' ')
.replace('Z', '')
}
const parts = new Intl.DateTimeFormat('zh-CN', {
timeZone: 'Asia/Shanghai',
hour12: false,
year: 'numeric',
month: '2-digit',
day: '2-digit',
hour: '2-digit',
minute: '2-digit',
second: '2-digit',
}).formatToParts(date)
const tokens = Object.fromEntries(
parts.filter((item) => item.type !== 'literal').map((item) => [item.type, item.value]),
)
return `${tokens.year}-${tokens.month}-${tokens.day} ${tokens.hour}:${tokens.minute}:${tokens.second}`
}
test('ISO 日期时间按 Asia/Shanghai 渲染成 YYYY-MM-DD HH:mm:ss', () => {
const payload = buildSuccessPayload({ createdAt: '2026-10-30T12:50:32.466Z' })
assert.equal(payload.data.createdAt, '2026-10-30 20:50:32')
})
test('嵌套对象与数组中的日期都会被格式化', () => {
const payload = buildSuccessPayload({
order: {
acceptedAt: '2026-10-30T16:00:00Z',
items: [
{ submittedAt: '2026-10-30T00:00:00+08:00' },
{ submittedAt: '2026-10-30T23:59:59Z' },
],
},
empty: null,
count: 3,
})
assert.deepEqual(payload.data, {
order: {
acceptedAt: '2026-10-31 00:00:00',
items: [{ submittedAt: '2026-10-30 00:00:00' }, { submittedAt: '2026-10-31 07:59:59' }],
},
empty: null,
count: 3,
})
})
test('非日期字符串与近似字符串保持原样', () => {
const payload = buildSuccessPayload({
a: '2026-10-30 12:50:32',
b: '2026-10-30',
c: 'work_order_123',
d: '2026-10-30T12:50',
e: '',
})
assert.deepEqual(payload.data, {
a: '2026-10-30 12:50:32',
b: '2026-10-30',
c: 'work_order_123',
d: '2026-10-30T12:50',
e: '',
})
})
test('非法日期字符串回退为去掉 T/Z 的原文（与旧行为一致）', () => {
const payload = buildSuccessPayload({ bad: '2026-13-45T99:99:99Z' })
assert.equal(payload.data.bad, legacyFormatResponseDateTime('2026-13-45T99:99:99Z'))
})
test('Date 实例被格式化为同一时区的字符串', () => {
const payload = buildSuccessPayload({ at: new Date('2026-10-30T12:50:32.466Z') })
assert.equal(payload.data.at, '2026-10-30 20:50:32')
})
test('与旧实现逐字节一致（跨时区/毫秒/闰日/跨年语料）', () => {
const corpus = [
'2026-10-30T12:50:32.466Z',
'2026-10-30T12:50:32Z',
'2026-10-30T12:50:32.000Z',
'2026-10-30T00:00:00Z',
'2026-10-30T15:59:59Z',
'2026-10-30T16:00:00Z',
'2024-02-29T23:59:59Z',
'2026-01-01T00:00:00Z',
'2025-12-31T16:30:00Z',
'2026-10-30T00:00:00+08:00',
'2026-10-30T00:00:00-05:00',
'2026-06-15T08:09:10+02:30',
'1999-12-31T23:59:59Z',
'2030-07-04T12:34:56.789Z',
' 2026-10-30T12:50:32Z ',
'not-a-date',
'',
]
for (const value of corpus) {
const actual = buildSuccessPayload({ v: value }).data.v
assert.equal(
actual,
legacyFormatResponseDateTime(value),
`mismatch for ${JSON.stringify(value)}`,
)
}
})
test('大列表响应只格式化一次 formatter（性能回归防护）', () => {
const rows = Array.from({ length: 200 }, (_, index) => ({
id: index,
createdAt: '2026-10-30T12:50:32.000Z',
acceptedAt: '2026-10-30T13:50:32.000Z',
}))
const startedAt = process.hrtime.bigint()
const payload = buildSuccessPayload({ rows })
const elapsedMs = Number(process.hrtime.bigint() - startedAt) / 1e6
assert.equal(payload.data.rows.length, 200)
assert.equal(payload.data.rows[199].createdAt, '2026-10-30 20:50:32')
// 旧实现 400 个日期约需 200ms+；这里给足余量，只防止"又回到每次 new"。
assert.ok(elapsedMs < 100, `格式化 400 个日期耗时异常：${elapsedMs.toFixed(1)}ms`)
})
apps/backend/src/utils/http.ts
+72 -24
View File
@@ -3,6 +3,29 @@ import { logDebug, logError, logWarn } from './logger.js'
const RESPONSE_TIME_ZONE = 'Asia/Shanghai'
/**
* 响应日期格式化器。
*
* 必须放在模块级只构造一次：`new Intl.DateTimeFormat()` 每次都会重新装载 ICU
* locale 数据，单次约 0.5~0.8ms。此前它被写在 formatResponseDateTime 内部，
* 而该函数对「每个响应里的每个日期字段」都会调用，实测吃掉了后端主线程约 30%
* 的 CPU（约 0.33 核）。提到模块级后单次降到 ~0.05ms。
*/
const RESPONSE_DATE_FORMATTER = new Intl.DateTimeFormat('zh-CN', {
timeZone: RESPONSE_TIME_ZONE,
hour12: false,
year: 'numeric',
month: '2-digit',
day: '2-digit',
hour: '2-digit',
minute: '2-digit',
second: '2-digit',
})
/** ISO 日期时间字面量匹配（与 isIsoDateTimeString 的原正则等价）。 */
const ISO_DATE_TIME_PATTERN =
/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(?:\.\d+)?(?:Z|[+-]\d{2}:\d{2})?$/
export type HttpErrorLike = {
statusCode?: number
errorCode?: string
@@ -185,12 +208,14 @@ function normalizeResponseDateTime(value: unknown): unknown {
}
if (value && typeof value === 'object') {
return Object.fromEntries(
Object.entries(value).map(([key, currentValue]) => [
key,
normalizeResponseDateTime(currentValue),
]),
)
// 用显式循环代替 Object.fromEntries(Object.entries(...))：后者会为每个对象
// 额外分配一个 entries 数组和一个 map 中间数组，大列表响应下会明显推高 GC。
const source = value as Record<string, unknown>
const normalized: Record<string, unknown> = {}
for (const key of Object.keys(source)) {
normalized[key] = normalizeResponseDateTime(source[key])
}
return normalized
}
if (isIsoDateTimeString(value)) {
@@ -201,10 +226,15 @@ function normalizeResponseDateTime(value: unknown): unknown {
}
function isIsoDateTimeString(value: unknown): boolean {
return (
typeof value === 'string' &&
/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(?:\.\d+)?(?:Z|[+-]\d{2}:\d{2})?$/.test(value.trim())
)
if (typeof value !== 'string') return false
const text = value.trim()
// 先用 O(1) 的位置判断挡掉绝大多数普通字符串，避免对每个字段值都跑正则。
// 正则要求形如 YYYY-MM-DDTHH:MM:SS，因此这些位置必然固定。
if (text.length < 19) return false
if (text.charCodeAt(4) !== 45 || text.charCodeAt(7) !== 45 || text.charCodeAt(10) !== 84) {
return false
}
return ISO_DATE_TIME_PATTERN.test(text)
}
function formatResponseDateTime(value: string): string {
@@ -216,22 +246,40 @@ function formatResponseDateTime(value: string): string {
.replace('Z', '')
}
const parts = new Intl.DateTimeFormat('zh-CN', {
timeZone: RESPONSE_TIME_ZONE,
hour12: false,
year: 'numeric',
month: '2-digit',
day: '2-digit',
hour: '2-digit',
minute: '2-digit',
second: '2-digit',
}).formatToParts(date)
const parts = RESPONSE_DATE_FORMATTER.formatToParts(date)
const tokens = Object.fromEntries(
parts.filter((item) => item.type !== 'literal').map((item) => [item.type, item.value]),
)
let year = ''
let month = ''
let day = ''
let hour = ''
let minute = ''
let second = ''
for (const part of parts) {
switch (part.type) {
case 'year':
year = part.value
break
case 'month':
month = part.value
break
case 'day':
day = part.value
break
case 'hour':
hour = part.value
break
case 'minute':
minute = part.value
break
case 'second':
second = part.value
break
default:
break
}
}
return `${tokens.year}-${tokens.month}-${tokens.day} ${tokens.hour}:${tokens.minute}:${tokens.second}`
return `${year}-${month}-${day} ${hour}:${minute}:${second}`
}
type RouteHandlerOptions = {