From b69a1f599afd9cdb267b1cfef07d27bf56b8f604 Mon Sep 17 00:00:00 2001
From: Nolan Lawson <nolan@nolanlawson.com>
Date: Thu, 25 May 2017 05:09:55 -0700
Subject: [PATCH] Add improved performance marks for development mode (#3297)

---
 app/javascript/mastodon/main.js        |  5 ++++-
 app/javascript/mastodon/performance.js | 24 ++++++++++++++++++++++++
 config/webpack/loaders/mark.js         |  8 ++++++++
 package.json                           |  2 ++
 yarn.lock                              |  8 ++++++++
 5 files changed, 46 insertions(+), 1 deletion(-)
 create mode 100644 app/javascript/mastodon/performance.js
 create mode 100644 config/webpack/loaders/mark.js

diff --git a/app/javascript/mastodon/main.js b/app/javascript/mastodon/main.js
index d11cb85219..44148fa92c 100644
--- a/app/javascript/mastodon/main.js
+++ b/app/javascript/mastodon/main.js
@@ -1,3 +1,5 @@
+const perf = require('./performance');
+
 // allow override variables here
 require.context('../../assets/stylesheets/', false, /variables.*\.scss$/);
 
@@ -14,10 +16,10 @@ function onDomContentLoaded(callback) {
 }
 
 function main() {
+  perf.start('main()');
   const Mastodon = require('mastodon/containers/mastodon').default;
   const React = require('react');
   const ReactDOM = require('react-dom');
-  window.Perf = require('react-addons-perf');
 
   require.context('../images/', true);
 
@@ -29,6 +31,7 @@ function main() {
     const props = JSON.parse(mountNode.getAttribute('data-props'));
 
     ReactDOM.render(<Mastodon {...props} />, mountNode);
+    perf.stop('main()');
   });
 }
 
diff --git a/app/javascript/mastodon/performance.js b/app/javascript/mastodon/performance.js
new file mode 100644
index 0000000000..64fd47bb3c
--- /dev/null
+++ b/app/javascript/mastodon/performance.js
@@ -0,0 +1,24 @@
+//
+// Tools for performance debugging, only enabled in development mode.
+// Open up Chrome Dev Tools, then Timeline, then User Timing to see output.
+// Also see config/webpack/loaders/mark.js for the webpack loader marks.
+//
+
+let marky;
+
+if (process.env.NODE_ENV === 'development') {
+  marky = require('marky');
+  require('react-addons-perf').start();
+}
+
+export function start(name) {
+  if (process.env.NODE_ENV === 'development') {
+    marky.mark(name);
+  }
+}
+
+export function stop(name) {
+  if (process.env.NODE_ENV === 'development') {
+    marky.stop(name);
+  }
+}
diff --git a/config/webpack/loaders/mark.js b/config/webpack/loaders/mark.js
new file mode 100644
index 0000000000..e62a526b02
--- /dev/null
+++ b/config/webpack/loaders/mark.js
@@ -0,0 +1,8 @@
+if (process.env.NODE_ENV === 'production') {
+  module.exports = {};
+} else {
+  module.exports = {
+    test: /\.js$/,
+    loader: 'mark-loader',
+  };
+}
diff --git a/package.json b/package.json
index 7a2d1d38c2..edded55c6d 100644
--- a/package.json
+++ b/package.json
@@ -60,6 +60,8 @@
     "is-nan": "^1.2.1",
     "js-yaml": "^3.8.3",
     "lodash": "^4.17.4",
+    "mark-loader": "^0.1.6",
+    "marky": "^1.2.0",
     "mkdirp": "^0.5.1",
     "node-sass": "^4.5.2",
     "npmlog": "^4.0.2",
diff --git a/yarn.lock b/yarn.lock
index a45352c538..31ba0ee6fe 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4018,6 +4018,14 @@ map-obj@^1.0.0, map-obj@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/map-obj/-/map-obj-1.0.1.tgz#d933ceb9205d82bdcf4886f6742bdc2b4dea146d"
 
+mark-loader@^0.1.6:
+  version "0.1.6"
+  resolved "https://registry.yarnpkg.com/mark-loader/-/mark-loader-0.1.6.tgz#0abb477dca7421d70e20128ff6489f5cae8676d5"
+
+marky@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/marky/-/marky-1.2.0.tgz#9617ed647bbbea8f45d19526da33dec70606df42"
+
 math-expression-evaluator@^1.2.14:
   version "1.2.14"
   resolved "https://registry.yarnpkg.com/math-expression-evaluator/-/math-expression-evaluator-1.2.14.tgz#39511771ed9602405fba9affff17eb4d2a3843ab"