Messenger example - logging

• Add Pulse tool for in-app logging
• Log auth handler errors
• Log message listener errors

Examples/xx-messenger/Sources/AppCore/Logger/Logger.swift

+import Foundation
+import Pulse
+import XCTestDynamicOverlay
+
+public struct Logger {
+  public enum Message: Equatable {
+    case error(NSError)
+  }
+
+  public var run: (Message, String, String, UInt) -> Void
+
+  public func callAsFunction(
+    _ msg: Message,
+    file: String = #file,
+    function: String = #function,
+    line: UInt = #line
+  ) {
+    run(msg, file, function, line)
+  }
+}
+
+extension Logger {
+  public static func live() -> Logger {
+    Logger { msg, file, function, line in
+      switch msg {
+      case .error(let error):
+        LoggerStore.shared.storeMessage(
+          label: "xx-messenger",
+          level: .error,
+          message: error.localizedDescription,
+          metadata: [:],
+          file: file,
+          function: function,
+          line: line
+        )
+      }
+    }
+  }
+}
+
+extension Logger {
+  public static let unimplemented = Logger(
+    run: XCTUnimplemented("\(Self.self).error")
+  )
+}