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Logging.swift
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Logging.swift
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// Credit for much of this class: https://steipete.com/posts/logging-in-swift/
import Foundation
import os
import OSLog
protocol LogWriter {
func log(_ message: String, withSensitiveInfo privateInfo: String?, level: OSLogType)
func logCrashAndSetFlag(error: Error)
}
@available(iOS 15, *)
protocol LogReader {
func fetchLogs() -> [String]
}
final class Logging {
private let logger: Logger
private let subsystem = Bundle.main.bundleIdentifier!
init(for category: String = "") {
self.logger = Logger(subsystem: subsystem, category: category)
}
}
extension Logging: LogWriter {
func log(
_ message: String,
withSensitiveInfo privateInfo: String? = nil,
level: OSLogType = .default
) {
if let privateInfo = privateInfo {
logger.log(level: level, "\(message): \(privateInfo, privacy: .sensitive)")
} else {
logger.log(level: level, "\(message)")
}
}
func logCrashAndSetFlag(error: Error) {
let errorDescription = error.localizedDescription
UserDefaults.shared.set(true, forKey: WFDefaults.didHaveFatalError)
UserDefaults.shared.set(errorDescription, forKey: WFDefaults.fatalErrorDescription)
logger.log(level: .error, "\(errorDescription)")
fatalError(errorDescription)
}
}
extension Logging: LogReader {
@available(iOS 15, *)
func fetchLogs() -> [String] {
var logs: [String] = []
do {
let osLog = try getLogEntries()
for logEntry in osLog {
let formattedEntry = formatEntry(logEntry)
logs.append(formattedEntry)
}
} catch {
logs.append("Could not fetch logs")
}
return logs
}
@available(iOS 15, *)
private func getLogEntries() throws -> [OSLogEntryLog] {
let logStore = try OSLogStore(scope: .currentProcessIdentifier)
let oneHourAgo = logStore.position(date: Date().addingTimeInterval(-3600))
let allEntries = try Array(logStore.__entriesEnumerator(position: oneHourAgo, predicate: nil))
return allEntries
.compactMap { $0 as? OSLogEntryLog }
.filter { $0.subsystem == subsystem }
}
@available(iOS 15, *)
private func formatEntry(_ logEntry: OSLogEntryLog) -> String {
/// The desired format is:
/// `date [process/category] LEVEL: composedMessage (threadIdentifier)`
var level: String = ""
switch logEntry.level {
case .debug:
level = "DEBUG"
case .info:
level = "INFO"
case .notice:
level = "NOTICE"
case .error:
level = "ERROR"
case .fault:
level = "FAULT"
default:
level = "UNDEFINED"
}
// swiftlint:disable:next line_length
return "\(logEntry.date) [\(logEntry.process)/\(logEntry.category)] \(level): \(logEntry.composedMessage) (\(logEntry.threadIdentifier))"
}
}

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