chore: adding duration logs for virus scan file download

src/app/modules/submission/submission.service.ts

@@ -33,6 +33,7 @@ import {
   ParsedClearFormFieldResponse,
 } from '../../../types/api'
 import { aws as AwsConfig } from '../../config/config'
+// import { statsdClient } from '../../config/datadog-statsd-client'
 import { createLoggerWithLabel } from '../../config/logger'
 import getPendingSubmissionModel from '../../models/pending_submission.server.model'
 import getSubmissionModel, {
@@ -385,6 +386,7 @@ export const downloadCleanFile = (cleanFileKey: string, versionId: string) => {
     })
     .createReadStream()
 
+  const timeDownloadStart = Date.now()
   logger.info({
     message: 'File download from S3 has started',
     meta: logMeta,
@@ -401,6 +403,12 @@ export const downloadCleanFile = (cleanFileKey: string, versionId: string) => {
         })
         resolve(buffer)
       })
+      const timeDownloadEnd = Date.now()
+
+      logger.info({
+        message: 'Duration of file download from S3',
+        meta: { ...logMeta, time: timeDownloadEnd - timeDownloadStart },
+      })
 
       readStream.on('error', (error) => {
         reject(error)
@@ -418,6 +426,14 @@ export const downloadCleanFile = (cleanFileKey: string, versionId: string) => {
   )
 }
 
+// statsdClient.distribution(
+//   'formsg.submissions.virusScanFile.duration',
+//   duration,
+//   {
+//     rating: `${rating}`,
+//   },
+// )
+
 /**
  * Helper function to trigger virus scanning and download clean file.
  * @param response quarantined attachment response from storage submissions v2.1+.