mixpanel-swift/Sources/FileLogging.swift

//
//  FileLogging.swift
//  MPLogger
//
//  Created by Sam Green on 7/8/16.
//  Copyright © 2016 Mixpanel. All rights reserved.
//

import Foundation

/// Logs all messages to a file
class FileLogging: MixpanelLogging {
  private let fileHandle: FileHandle

  init(path: String) {
    if let handle = FileHandle(forWritingAtPath: path) {
      fileHandle = handle
    } else {
      fileHandle = FileHandle.standardError
    }

    // Move to the end of the file so we can append messages
    fileHandle.seekToEndOfFile()
  }

  deinit {
    // Ensure we close the file handle to clear the resources
    fileHandle.closeFile()
  }

  func addMessage(message: MixpanelLogMessage) {
    let string =
      "File: \(message.file) - Func: \(message.function) - "
      + "Level: \(message.level.rawValue) - Message: \(message.text)"
    if let data = string.data(using: String.Encoding.utf8) {
      // Write the message as data to the file
      fileHandle.write(data)
    }
  }
}