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//
// Logging.swift
// MullvadVPN
//
// Created by pronebird on 02/08/2020.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
import Foundation
@_exported import Logging
import MullvadTypes
private enum LoggerOutput {
case fileOutput(_ fileOutput: LogFileOutputStream)
case osLogOutput(_ subsystem: String)
}
public struct LoggerBuilder {
private(set) var logRotationErrors: [Error] = []
private var outputs: [LoggerOutput] = []
public var metadata: Logger.Metadata = [:]
public var logLevel: Logger.Level = .debug
public var header: String
public init(header: String) {
self.header = header
}
public mutating func addFileOutput(fileURL: URL) {
let logsDirectoryURL = fileURL.deletingLastPathComponent()
try? FileManager.default.createDirectory(
at: logsDirectoryURL,
withIntermediateDirectories: false,
attributes: nil
)
do {
try LogRotation.rotateLogs(
logDirectory: logsDirectoryURL,
options: LogRotation.Options(
storageSizeLimit: 2_000_000, // 2 MB
oldestAllowedDate: Date(timeIntervalSinceNow: -Duration.days(7).timeInterval)
))
} catch {
logRotationErrors.append(error)
}
outputs.append(.fileOutput(LogFileOutputStream(fileURL: fileURL, header: header)))
}
public mutating func addOSLogOutput(subsystem: String) {
outputs.append(.osLogOutput(subsystem))
}
public func install() {
LoggingSystem.bootstrap { label -> LogHandler in
let logHandlers: [LogHandler] = outputs.map { output in
switch output {
case let .fileOutput(stream):
return CustomFormatLogHandler(label: label, streams: [stream])
case let .osLogOutput(subsystem):
return OSLogHandler(subsystem: subsystem, category: label)
}
}
if logHandlers.isEmpty {
return SwiftLogNoOpLogHandler()
} else {
var multiplex = MultiplexLogHandler(logHandlers)
multiplex.metadata = metadata
multiplex.logLevel = logLevel
return multiplex
}
}
if !logRotationErrors.isEmpty {
let rotationLogger = Logger(label: "LogRotation")
for error in logRotationErrors {
rotationLogger.error(error: error, message: error.localizedDescription)
}
}
}
}
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