Austin McKinley
54 lines
1.3 KiB
TypeScript
54 lines
1.3 KiB
TypeScript
import {performance} from 'node:perf_hooks'
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import {ErrorRequestHandler, Request, RequestHandler, Response} from 'express'
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import {httpLogger} from '../logger.js'
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const SLOW_REQUEST_THRESHOLD_MS = 1000
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export type Handler = (req: Request, res: Response) => Awaited<void>
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export const handler = (runHandler: Handler): RequestHandler => {
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return async (req, res, next) => {
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try {
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await runHandler(req, res)
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} catch (err) {
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next(err)
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}
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}
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}
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export const observedHandler = (
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operation: string,
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runHandler: Handler,
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): RequestHandler => {
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return handler(async (req, res) => {
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const startedAt = performance.now()
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try {
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await runHandler(req, res)
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} finally {
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const durationMs = Math.round(performance.now() - startedAt)
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if (durationMs >= SLOW_REQUEST_THRESHOLD_MS) {
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httpLogger.warn(
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{
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durationMs,
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method: req.method,
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operation,
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requestTraceId: req.get('x-amzn-trace-id'),
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statusCode: res.statusCode,
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},
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'slow request',
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)
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}
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}
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})
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}
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export const errorHandler: ErrorRequestHandler = (err, _req, res, next) => {
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httpLogger.error({err}, 'request error')
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if (res.headersSent) {
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return next(err)
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}
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return res.status(500).end('server error')
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}
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