Merge branch 'main' into openapi-update-e3d37e33f5d6f3db5d80d5d602d7772843d043867c57c3e0ed3dd0af80aeec77

lib/instrument-middleware.js

@@ -0,0 +1,19 @@
+const path = require('path')
+const statsd = require('./statsd')
+
+module.exports = function instrumentMiddleware (relativePath) {
+  // Requires the file as if it were being required from '../middleware/index.js'.
+  // This is a little wonky, but let's us write `app.use(instrument(path))` and
+  // maintain the name of the file, instead of hard-coding it for each middleware.
+  const middleware = require(path.resolve(__dirname, '../middleware', relativePath))
+
+  // Check if the middleware is an async function, to use the appropriate timer
+  const isAsyncFunction = middleware.constructor.name === 'AsyncFunction'
+
+  // Add a tag so we can see all middleware together
+  const tags = { middleware: path.basename(relativePath) }
+
+  return isAsyncFunction
+    ? statsd.asyncTimer(middleware, 'middleware', tags)
+    : statsd.timer(middleware, 'middleware', tags)
+}