Log slow Blink database operations (#11505)

bskylink/src/routes/util.ts

@@ -1,7 +1,11 @@
+import {performance} from 'node:perf_hooks'
+
 import {ErrorRequestHandler, Request, RequestHandler, Response} from 'express'
 
 import {httpLogger} from '../logger.js'
 
+const SLOW_REQUEST_THRESHOLD_MS = 1000
+
 export type Handler = (req: Request, res: Response) => Awaited<void>
 
 export const handler = (runHandler: Handler): RequestHandler => {
@@ -14,6 +18,32 @@ export const handler = (runHandler: Handler): RequestHandler => {
   }
 }
 
+export const observedHandler = (
+  operation: string,
+  runHandler: Handler,
+): RequestHandler => {
+  return handler(async (req, res) => {
+    const startedAt = performance.now()
+    try {
+      await runHandler(req, res)
+    } finally {
+      const durationMs = Math.round(performance.now() - startedAt)
+      if (durationMs >= SLOW_REQUEST_THRESHOLD_MS) {
+        httpLogger.warn(
+          {
+            durationMs,
+            method: req.method,
+            operation,
+            requestTraceId: req.get('x-amzn-trace-id'),
+            statusCode: res.statusCode,
+          },
+          'slow request',
+        )
+      }
+    }
+  })
+}
+
 export const errorHandler: ErrorRequestHandler = (err, _req, res, next) => {
   httpLogger.error({err}, 'request error')
   if (res.headersSent) {