http: trace http client by perf_hooks

Author: theanarkh

lib/_http_client.js

@@ -57,7 +57,7 @@ const Agent = require('_http_agent');
 const { Buffer } = require('buffer');
 const { defaultTriggerAsyncIdScope } = require('internal/async_hooks');
 const { URL, urlToHttpOptions, searchParamsSymbol } = require('internal/url');
-const { kOutHeaders, kNeedDrain } = require('internal/http');
+const { kOutHeaders, kNeedDrain, emitStatistics } = require('internal/http');
 const { connResetException, codes } = require('internal/errors');
 const {
   ERR_HTTP_HEADERS_SENT,
@@ -75,6 +75,12 @@ const {
   DTRACE_HTTP_CLIENT_RESPONSE
 } = require('internal/dtrace');
 
+const {
+  hasObserver,
+} = require('internal/perf/observe');
+
+const kClientRequestStatistics = Symbol('ClientRequestStatistics');
+
 const { addAbortSignal, finished } = require('stream');
 
 let debug = require('internal/util/debuglog').debuglog('http', (fn) => {
@@ -337,6 +343,12 @@ ObjectSetPrototypeOf(ClientRequest, OutgoingMessage);
 ClientRequest.prototype._finish = function _finish() {
   DTRACE_HTTP_CLIENT_REQUEST(this, this.socket);
   FunctionPrototypeCall(OutgoingMessage.prototype._finish, this);
+  if (hasObserver('http')) {
+    this[kClientRequestStatistics] = {
+      startTime: process.hrtime(),
+      type: 'HttpClient'
+    };
+  }
 };
 
 ClientRequest.prototype._implicitHeader = function _implicitHeader() {
@@ -604,6 +616,7 @@ function parserOnIncomingClient(res, shouldKeepAlive) {
   }
 
   DTRACE_HTTP_CLIENT_RESPONSE(socket, req);
+  emitStatistics(req[kClientRequestStatistics]);
   req.res = res;
   res.req = req;
 

lib/_http_server.js

@@ -193,7 +193,8 @@ function ServerResponse(req) {
 
   if (hasObserver('http')) {
     this[kServerResponseStatistics] = {
-      startTime: process.hrtime()
+      startTime: process.hrtime(),
+      type: 'HttpRequest'
     };
   }
 }

lib/internal/http.js

@@ -38,7 +38,7 @@ function emitStatistics(statistics) {
   const startTime = statistics.startTime;
   const diff = process.hrtime(startTime);
   const entry = new InternalPerformanceEntry(
-    'HttpRequest',
+    statistics.type,
     'http',
     startTime[0] * 1000 + startTime[1] / 1e6,
     diff[0] * 1000 + diff[1] / 1e6,