| // Copyright 2016 The Tulsi Authors. All rights reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| import Foundation |
| import TulsiGenerator |
| |
| |
| /// Writes events to the console. |
| final class EventLogger { |
| private let verbose: Bool |
| private var observer: NSObjectProtocol? = nil |
| |
| init(verbose: Bool) { |
| self.verbose = verbose |
| } |
| |
| deinit { |
| if let observer = self.observer { |
| NotificationCenter.default.removeObserver(observer) |
| } |
| } |
| |
| func startLogging() { |
| observer = NotificationCenter.default.addObserver(forName: NSNotification.Name(rawValue: TulsiMessageNotification), |
| object: nil, |
| queue: nil) { |
| [weak self] (notification: Notification) in |
| guard let item = LogMessage(notification: notification), |
| let verbose = self?.verbose, verbose || item.level != .Info else { |
| return |
| } |
| |
| let level: String = item.level.rawValue |
| let details: String |
| if let itemDetails = item.details { |
| details = " \(itemDetails)" |
| } else { |
| details = "" |
| } |
| print("[\(level)] \(item.message)\(details)") |
| } |
| } |
| } |