Network Logger

NetworkLogger.swift

import Foundation

public protocol NetworkLoggable {
  func log<T: CustomStringConvertible>(
    label: String,
    value: T?,
    level: NetworkLogger,
    function: StaticString,
    line: UInt,
    file: String
  )
}

extension NetworkLoggable {
  public func log<T: CustomStringConvertible>(
    label: String,
    value: T?,
    level: NetworkLogger,
    function: StaticString,
    line: UInt,
    file: String
  ) {
    #if DEBUG
    let fileName = ((file as NSString).lastPathComponent as NSString).deletingPathExtension
    let thread = Thread.isMainThread ? "MAIN" : "BG"
    let threadID = String(format: "%x", pthread_mach_thread_np(pthread_self()))
    let value = value?.description ?? "nil"
    print("[\(Date().logTimeStamp)] [\(fileName):\(line)] [\(function)] [\(thread):\(threadID)] [\(label): \(value)]")
    #endif
  }
}

fileprivate extension Date {
  var logTimeStamp: String {
    let formatter = DateFormatter()
    formatter.dateFormat = "HH:mm:ss.SSS"
    return formatter.string(from: self)
  }
}

struct StandardLogger: NetworkLoggable { }

public struct NetworkLogger {
  public static var logger: NetworkLoggable = StandardLogger()
  public var verbosity: Int
  public func log<T: CustomStringConvertible>(
    label: String,
    value: @autoclosure () -> T?,
    level: NetworkLogger,
    function: StaticString = #function,
    line: UInt = #line,
    file: String = #file
  ) {
    guard level.verbosity <= verbosity else { return }
    NetworkLogger.logger.log(label: label, value: value(), level: level, function: function, line: line, file: file)
  }
}

extension NetworkLogger {
  static let debug = NetworkLogger(verbosity: 6)
  static let info = NetworkLogger(verbosity: 5)
  static let notice = NetworkLogger(verbosity: 4)
  static let warning = NetworkLogger(verbosity: 3)
  static let error = NetworkLogger(verbosity: 2)
  static let critical = NetworkLogger(verbosity: 1)
  static let none = NetworkLogger(verbosity: 0)
}