TK
98 lines
2.2 KiB
Swift
98 lines
2.2 KiB
Swift
//
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// Logger.swift
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// PacketTunnel
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//
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// Created by Jerry Bool on 2022/12/6.
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//
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import Foundation
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class Logger {
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static let ENABLE_LOGGING = true
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static var vpnLogFile: URL? = {
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FileManager.default.vpnLogFile?.truncate()
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}()
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static func log(_ message: String, to: URL?) {
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guard ENABLE_LOGGING,
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let url = to,
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let data = message.trimmingCharacters(in: .whitespacesAndNewlines).appending("\n").data(using: .utf8),
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let fh = try? FileHandle(forUpdating: url)
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else {
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return
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}
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defer {
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fh.closeFile()
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}
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fh.seekToEndOfFile()
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fh.write(data)
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}
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private static var logFsObject: DispatchSourceFileSystemObject? {
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didSet {
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oldValue?.cancel()
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}
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}
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private static var logText = ""
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static func tailFile(_ url: URL?, _ update: ((_ logText: String) -> Void)? = nil) {
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// Stop and remove the previous watched content.
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// (Will implicitely call #stop through `didSet` hook!)
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logFsObject = nil
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guard let url = url,
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let fh = try? FileHandle(forReadingFrom: url)
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else {
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return
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}
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let ui = {
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let data = fh.readDataToEndOfFile()
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if let content = String(data: data, encoding: .utf8) {
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logText.append(content)
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update?(logText)
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}
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}
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logText = ""
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ui()
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logFsObject = DispatchSource.makeFileSystemObjectSource(
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fileDescriptor: fh.fileDescriptor,
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eventMask: [.extend, .delete, .link],
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queue: .main)
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logFsObject?.setEventHandler {
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guard let data = logFsObject?.data else {
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return
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}
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if data.contains(.delete) || data.contains(.link) {
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DispatchQueue.main.async {
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tailFile(url, update)
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}
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}
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if data.contains(.extend) {
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ui()
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}
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}
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logFsObject?.setCancelHandler {
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try? fh.close()
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logText = ""
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}
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logFsObject?.resume()
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}
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}
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