From 922330b9952cb89fbe0b82016dd2ca4a0606e5e1 Mon Sep 17 00:00:00 2001
From: Karl Heinz Struggl <karl.struggl@sentry.io>
Date: Thu, 30 Nov 2023 12:29:52 +0100
Subject: [PATCH] add File I/O perf issue (ui.load, manual action)

---
 EmpowerPlant/Base.lproj/Main.storyboard       | 12 ++++++++++--
 EmpowerPlant/EmpowerPlantViewController.swift |  9 +++++++++
 EmpowerPlant/ListAppViewController.swift      | 18 ++++++++++++++++++
 3 files changed, 37 insertions(+), 2 deletions(-)

diff --git a/EmpowerPlant/Base.lproj/Main.storyboard b/EmpowerPlant/Base.lproj/Main.storyboard
index 4c22f7b..481b5a5 100644
--- a/EmpowerPlant/Base.lproj/Main.storyboard
+++ b/EmpowerPlant/Base.lproj/Main.storyboard
@@ -69,7 +69,7 @@
                                         <rect key="frame" x="20" y="0.0" width="374" height="0.0"/>
                                     </progressView>
                                     <stackView opaque="NO" contentMode="scaleToFill" verticalCompressionResistancePriority="751" alignment="top" translatesAutoresizingMaskIntoConstraints="NO" id="CCo-Yo-I2U">
-                                        <rect key="frame" x="8" y="0.0" width="398" height="345"/>
+                                        <rect key="frame" x="8" y="0.0" width="398" height="379.5"/>
                                         <subviews>
                                             <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" alignment="center" translatesAutoresizingMaskIntoConstraints="NO" id="99H-zP-cDK">
                                                 <rect key="frame" x="0.0" y="0.0" width="199" height="310.5"/>
@@ -157,7 +157,7 @@
                                                 </subviews>
                                             </stackView>
                                             <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" alignment="center" translatesAutoresizingMaskIntoConstraints="NO" id="KlN-al-BhV">
-                                                <rect key="frame" x="199" y="0.0" width="199" height="345"/>
+                                                <rect key="frame" x="199" y="0.0" width="199" height="379.5"/>
                                                 <subviews>
                                                     <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="esb-g7-ouy">
                                                         <rect key="frame" x="34" y="0.0" width="131.5" height="34.5"/>
@@ -239,6 +239,14 @@
                                                             <action selector="jsonMainThread:" destination="VXN-aD-u60" eventType="touchUpInside" id="iM7-uu-pjl"/>
                                                         </connections>
                                                     </button>
+                                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="nuh-js-Myu">
+                                                        <rect key="frame" x="29.5" y="345" width="140.5" height="34.5"/>
+                                                        <state key="normal" title="Button"/>
+                                                        <buttonConfiguration key="configuration" style="plain" title="File I/O on main"/>
+                                                        <connections>
+                                                            <action selector="fileIoOnMainThread:" destination="VXN-aD-u60" eventType="touchUpInside" id="WuA-Fh-H1D"/>
+                                                        </connections>
+                                                    </button>
                                                 </subviews>
                                             </stackView>
                                         </subviews>
diff --git a/EmpowerPlant/EmpowerPlantViewController.swift b/EmpowerPlant/EmpowerPlantViewController.swift
index a9c09bd..2125e5d 100644
--- a/EmpowerPlant/EmpowerPlantViewController.swift
+++ b/EmpowerPlant/EmpowerPlantViewController.swift
@@ -50,6 +50,7 @@ class EmpowerPlantViewController: UIViewController {
         getAllProductsFromServer()
         getAllProductsFromDb()
         readCurrentDirectory()
+        performLongFileOperation()
         
         NotificationCenter.default.addObserver(forName: modifiedDBNotificationName, object: nil, queue: nil) { _ in
             self.getAllProductsFromDb()
@@ -61,6 +62,14 @@ class EmpowerPlantViewController: UIViewController {
         SentrySDK.reportFullyDisplayed()
     }
     
+    func performLongFileOperation() {
+        let longString = String(repeating: UUID().uuidString, count: 5_000_000)
+        let data = longString.data(using: .utf8)!
+        let filePath = FileManager.default.temporaryDirectory.appendingPathComponent("tmp" + UUID().uuidString)
+        try! data.write(to: filePath)
+        try! FileManager.default.removeItem(at: filePath)
+    }
+    
     func readCurrentDirectory() {
         let path = FileManager.default.currentDirectoryPath
         do {
diff --git a/EmpowerPlant/ListAppViewController.swift b/EmpowerPlant/ListAppViewController.swift
index 0134217..d1d32a7 100644
--- a/EmpowerPlant/ListAppViewController.swift
+++ b/EmpowerPlant/ListAppViewController.swift
@@ -290,6 +290,24 @@ class ListAppViewController: UIViewController {
         span.finish()
     }
     
+    @IBAction func fileIoOnMainThread(_ sender: Any) {
+        progressIndicator.isHidden = false
+        DispatchQueue.global(qos: .utility).async {
+            let longString = String(repeating: UUID().uuidString, count: 5_000_000)
+            let data = longString.data(using: .utf8)!
+            let filePath = FileManager.default.temporaryDirectory.appendingPathComponent("tmp" + UUID().uuidString)
+            DispatchQueue.main.async {
+                let transaction = SentrySDK.startTransaction(name: "test", operation: "fileio-on-main", bindToScope: true)
+                try! data.write(to: filePath)
+                transaction.finish()
+                self.progressIndicator.isHidden = true
+                DispatchQueue.global(qos: .utility).async {
+                    try! FileManager.default.removeItem(at: filePath)
+                }
+            }
+        }
+    }
+    
     // !!!: profiling doesn't correctly collect backtraces with this (armcknight 12 Oct 2023)
     func factorialRecursive(int x: BigInt) -> BigInt {
         if x == 0 { return 1 }