Include exceptions in the logs

Example/Diagnostics-Example/Supporting Files/Base.lproj/Main.storyboard

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="15505" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="16097" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
     <device id="retina6_1" orientation="portrait" appearance="light"/>
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="15510"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="16087"/>
         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
@@ -22,11 +22,29 @@
                                     <action selector="sendDiagnostics:" destination="BYZ-38-t0r" eventType="touchUpInside" id="9M3-6U-Ewz"/>
                                 </connections>
                             </button>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="WIU-ba-HLD">
+                                <rect key="frame" x="155.5" y="772" width="103" height="30"/>
+                                <state key="normal" title="Trigger a crash"/>
+                                <connections>
+                                    <action selector="crashTriggerButtonTapped:" destination="BYZ-38-t0r" eventType="touchUpInside" id="Uii-kB-MjN"/>
+                                </connections>
+                            </button>
+                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Trigger a crash to see how it ends up in the report" textAlignment="center" lineBreakMode="tailTruncation" numberOfLines="2" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="sdk-GT-eTr">
+                                <rect key="frame" x="60" y="730" width="294" height="34"/>
+                                <fontDescription key="fontDescription" style="UICTFontTextStyleFootnote"/>
+                                <nil key="textColor"/>
+                                <nil key="highlightedColor"/>
+                            </label>
                         </subviews>
                         <color key="backgroundColor" systemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
                         <constraints>
                             <constraint firstItem="BEa-uA-oUu" firstAttribute="centerY" secondItem="6Tk-OE-BBY" secondAttribute="centerY" id="8Dh-z9-7qe"/>
+                            <constraint firstItem="WIU-ba-HLD" firstAttribute="centerX" secondItem="6Tk-OE-BBY" secondAttribute="centerX" id="8jb-X9-Gt4"/>
+                            <constraint firstItem="WIU-ba-HLD" firstAttribute="top" secondItem="sdk-GT-eTr" secondAttribute="bottom" constant="8" id="BKG-65-OcU"/>
+                            <constraint firstItem="6Tk-OE-BBY" firstAttribute="bottom" secondItem="WIU-ba-HLD" secondAttribute="bottom" constant="60" id="Bfb-vo-yeh"/>
+                            <constraint firstItem="sdk-GT-eTr" firstAttribute="leading" secondItem="6Tk-OE-BBY" secondAttribute="leading" constant="60" id="JpG-Uu-CKP"/>
                             <constraint firstItem="BEa-uA-oUu" firstAttribute="centerX" secondItem="6Tk-OE-BBY" secondAttribute="centerX" id="gp0-3e-aM6"/>
+                            <constraint firstItem="6Tk-OE-BBY" firstAttribute="trailing" secondItem="sdk-GT-eTr" secondAttribute="trailing" constant="60" id="j3D-tG-nc3"/>
                         </constraints>
                         <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
                     </view>

Example/Diagnostics-Example/ViewController.swift

@@ -10,9 +10,9 @@ import UIKit
 import MessageUI
 import Diagnostics
 
-class ViewController: UIViewController {
+final class ViewController: UIViewController {
 
-    @IBAction func sendDiagnostics(_ sender: UIButton) {
+    @IBAction private func sendDiagnostics(_ sender: UIButton) {
         /// Create the report.
         var reporters = DiagnosticsReporter.DefaultReporter.allReporters
         reporters.insert(CustomReporter.self, at: 1)
@@ -37,6 +37,11 @@ class ViewController: UIViewController {
         present(mail, animated: true)
     }
 
+    @IBAction private func crashTriggerButtonTapped(_ sender: Any) {
+        /// Swift exceptions can't be catched yet, unfortunately.
+        let array = NSArray(array: ["Antoine", "Boris", "Kaira"])
+        print(array.object(at: 4)) // Classic index out of bounds crash
+    }
 }
 
 extension ViewController: MFMailComposeViewControllerDelegate {

Sources/DiagnosticsLogger.swift

@@ -82,23 +82,8 @@ public final class DiagnosticsLogger {
     }
 }
 
-// MARK: - Setup & Logging
+// MARK: - Setup
 extension DiagnosticsLogger {
-    /// Reads the log and converts it to a `Data` object.
-    func readLog() -> Data? {
-        guard isSetup else {
-            assertionFailure("Trying to read the log while not set up")
-            return nil
-        }
-
-        return queue.sync { try? Data(contentsOf: logFileLocation) }
-    }
-
-    /// Removes the log file. Should only be used for testing purposes.
-    func deleteLogs() throws {
-        guard FileManager.default.fileExists(atPath: logFileLocation.path) else { return }
-        try? FileManager.default.removeItem(atPath: logFileLocation.path)
-    }
 
     private func setup() throws {
         if !FileManager.default.fileExists(atPath: logFileLocation.path) {
@@ -113,11 +98,42 @@ extension DiagnosticsLogger {
         logFileHandle!.seekToEndOfFile()
         logSize = Int64(logFileHandle!.offsetInFile)
         setupPipe()
+        setupCrashMonitoring()
         isSetup = true
         startNewSession()
     }
 
-    internal func startNewSession() {
+    private func setupCrashMonitoring() {
+        NSSetUncaughtExceptionHandler { exception in
+            DiagnosticsLogger.logExceptionUsingCallStackSymbols(exception, description: "Uncaught Exception")
+        }
+    }
+
+    /// Creates a new log section with the current thread call stack symbols.
+    private static func logExceptionUsingCallStackSymbols(_ exception: NSException, description: String) {
+        let message = """
+
+        ---
+
+        🚨 CRASH:
+        Description: \(description)
+        Exception name: \(exception.name.rawValue)
+        Reason: \(exception.reason ?? "nil")
+
+            \(Thread.callStackSymbols.joined(separator: "\n"))
+
+        ---
+
+        """
+        standard.log(message)
+    }
+}
+
+// MARK: - Setup & Logging
+extension DiagnosticsLogger {
+
+    /// Creates a new section in the overall logs with data about the session start and system information.
+    func startNewSession() {
         queue.async { [unowned self] in
             let date = self.formatter.string(from: Date())
             let appVersion = "\(Bundle.appVersion) (\(Bundle.appBuildNumber))"
@@ -134,6 +150,22 @@ extension DiagnosticsLogger {
         }
     }
 
+    /// Reads the log and converts it to a `Data` object.
+    func readLog() -> Data? {
+        guard isSetup else {
+            assertionFailure("Trying to read the log while not set up")
+            return nil
+        }
+
+        return queue.sync { try? Data(contentsOf: logFileLocation) }
+    }
+
+    /// Removes the log file. Should only be used for testing purposes.
+    func deleteLogs() throws {
+        guard FileManager.default.fileExists(atPath: logFileLocation.path) else { return }
+        try? FileManager.default.removeItem(atPath: logFileLocation.path)
+    }
+
     private func log(message: String, file: String = #file, function: String = #function, line: UInt = #line) {
         guard isSetup else { return assertionFailure("Trying to log a message while not set up") }
 

Sources/DiagnosticsReporter.swift

@@ -103,7 +103,7 @@ extension DiagnosticsReporter {
     static func style() -> HTML {
         /// To add Swift Package Manager support we're adding the CSS directly here. This is because we can't add resources to packages in SPM.
         return """
-        <style>body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol";-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:1em;line-height:1.3em;margin:50px 50px 20px;color:#17181a}h1{margin:10px 0 20px;font-weight:400}h3{display:block;font-weight:400;font-size:20px;margin:0 0 10px}p{font-size:14px;margin:0 0 10px;display:block}p:last-child,ul:last-child{margin-bottom:0}pre{overflow:scroll}.container{display:flex;justify-content:space-between;flex-direction:row-reverse;max-width:960px;margin:0 auto}.main-content{width:calc(100% - 190px)}.nav-container{width:180px}.nav-container nav{position:fixed;border-radius:4px}.nav-container nav ul{margin:0}.nav-container nav ul li{margin-bottom:5px;display:block}.nav-container nav ul li:last-child{margin-bottom:0}.nav-container nav ul li a{font-size:14px;color:#444;text-decoration:none}.nav-container nav ul li a:hover{color:#000;text-decoration:underline}.chapter{position:relative;margin-bottom:20px;padding-bottom:20px;border-bottom:1px solid #ccc}.chapter:last-child{border-bottom:0}.chapter .anchor{position:absolute;top:-20px}table th{text-align:left;padding:0 5px 0 0;font-weight:500}table td,table th{font-size:14px}footer{text-align:center;font-size:14px}footer a{color:#111}.footer-logo{width:20px;display:inline-block;vertical-align:middle}@media(max-width:768px){body{margin:20px}.container{margin:0}header h1{font-size:24px}.main-content{width:100%}.nav-container{display:none}table td,table th{display:block}table td{margin-bottom:5px}}@media (prefers-color-scheme:dark){body{background:#111;color:#f7f7f7}.chapter{border-bottom-color:rgba(255,255,255,.3)}.nav-container nav ul li a{color:rgba(255,255,255,.6)}.nav-container nav ul li a:hover{color:#fff}footer a{color:rgba(255,255,255,.85)}footer a:hover{color:#fff}.footer-logo path{fill:#f7f7f7}}</style>
+        <style>body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol";-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:1em;line-height:1.3em;margin:50px 50px 20px;color:#17181a}h1{margin:10px 0 20px;font-weight:400}h3{display:block;font-weight:400;font-size:20px;margin:0 0 10px}p{font-size:14px;margin:0 0 10px;display:block}p:last-child,ul:last-child{margin-bottom:0}pre{overflow:scroll}.container{display:flex;justify-content:space-between;flex-direction:row-reverse;margin:0 auto}.main-content{width:calc(100% - 190px)}.nav-container{width:180px}.nav-container nav{position:fixed;border-radius:4px}.nav-container nav ul{margin:0}.nav-container nav ul li{margin-bottom:5px;display:block}.nav-container nav ul li:last-child{margin-bottom:0}.nav-container nav ul li a{font-size:14px;color:#444;text-decoration:none}.nav-container nav ul li a:hover{color:#000;text-decoration:underline}.chapter{position:relative;margin-bottom:20px;padding-bottom:20px;border-bottom:1px solid #ccc}.chapter:last-child{border-bottom:0}.chapter .anchor{position:absolute;top:-20px}table th{text-align:left;padding:0 5px 0 0;font-weight:500}table td,table th{font-size:14px}footer{text-align:center;font-size:14px}footer a{color:#111}.footer-logo{width:20px;display:inline-block;vertical-align:middle}@media(max-width:768px){body{margin:20px}.container{margin:0}header h1{font-size:24px}.main-content{width:100%}.nav-container{display:none}table td,table th{display:block}table td{margin-bottom:5px}}@media (prefers-color-scheme:dark){body{background:#111;color:#f7f7f7}.chapter{border-bottom-color:rgba(255,255,255,.3)}.nav-container nav ul li a{color:rgba(255,255,255,.6)}.nav-container nav ul li a:hover{color:#fff}footer a{color:rgba(255,255,255,.85)}footer a:hover{color:#fff}.footer-logo path{fill:#f7f7f7}}</style>
         """
     }
 

Sources/style.css

@@ -44,7 +44,6 @@ pre {
   display: flex;
   justify-content: space-between;
   flex-direction: row-reverse;
-  max-width: 960px;
   margin: 0 auto;
 }