iOSDC JAPAN 2017 Demo - Log.swift

Log.swift

import Foundation
import os.log
import Crashlytics

final class Log {
    private init() {}

    static func debug(message: String) {
        writeLog(message: message, level: .debug)
    }

    static func info(message: String) {
        writeLog(message: message, level: .info)
        CLSLogv("%@", getVaList([message]))
    }

    static func error(message: String) {
        writeLog(message: message, level: .error)
        CLSLogv("[Error] %@", getVaList([message]))
    }

    static func error(error: Error) {
        let message = String(reflecting: error)
        writeLog(message: message, level: .error)
        CLSLogv("[Error] %@", getVaList([message]))
    }

    static func fatal(message: String, file: String = #file, function: String = #function, line: Int = #line) {
        writeLog(message: message, level: .fatal)

        let fileName = file.components(separatedBy: "/").last ?? ""
        let error = NSError(
            domain: "\(fileName):\(function)",
            code: line,
            userInfo: ["message": message]
        )
        Crashlytics.sharedInstance().recordError(error)
        assertionFailure(message)
    }

    static func fatal(error: Error) {
        let message = String(reflecting: error)
        writeLog(message: message, level: .fatal)

        Crashlytics.sharedInstance().recordError(error as NSError)
        assertionFailure(message)
    }

    private static func writeLog(message: String, level: Level) {
        os_log("%@%@", log: .default, type: .debug, level.description, message)
    }

    private enum Level: CustomStringConvertible {
        case debug, info, error, fatal

        var description: String {
            switch self {
            case .debug: return "⚒"
            case .info: return "ℹ️"
            case .error: return "❗️"
            case .fatal: return "😱"
            }
        }
    }
}