XXMessengerClient - logging

XXMessengerClient

• Add MessengerSetLogLevel function.
• Add MessengerStartLogging function.
• Implement logging with swift-log package.

xx-messenger example

• Log using swift-log package.
• Bootstrap logging system with Pulse library.
• Start logging when creating AppEnvironment.

Sources/XXMessengerClient/Utils/LogMessage.swift

+import Foundation
+import Logging
+
+struct LogMessage: Equatable {
+  var level: Logger.Level
+  var text: String
+}
+
+extension LogMessage {
+  static func parse(_ string: String) -> LogMessage? {
+    let level: Logger.Level
+    let text: String
+    let pattern = #"([A-Z]+) (.*)"#
+    let regex = try! NSRegularExpression(pattern: pattern)
+    let stringRange = NSRange(location: 0, length: string.utf16.count)
+    if let match = regex.firstMatch(in: string, range: stringRange) {
+      var groups: [Int: String] = [:]
+      for rangeIndex in 1..<match.numberOfRanges {
+        let nsRange = match.range(at: rangeIndex)
+        if !NSEqualRanges(nsRange, NSMakeRange(NSNotFound, 0)) {
+          let group = (string as NSString).substring(with: nsRange)
+          groups[rangeIndex] = group
+        }
+      }
+      level = .fromString(groups[1])
+      text = groups[2] ?? string
+    } else {
+      level = .notice
+      text = string
+    }
+    return LogMessage(level: level, text: text)
+  }
+}
+
+private extension Logger.Level {
+  static func fromString(_ string: String?) -> Logger.Level {
+    switch string {
+    case "TRACE": return .trace
+    case "DEBUG": return .debug
+    case "INFO": return .info
+    case "WARN": return .warning
+    case "ERROR": return .error
+    case "CRITICAL": return .critical
+    case "FATAL": return .critical
+    default: return .notice
+    }
+  }
+}