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//
// LogStreamerViewController.swift
// MullvadVPN
//
// Created by pronebird on 17/08/2020.
// Copyright © 2020 Mullvad VPN AB. All rights reserved.
//
#if DEBUG
import Foundation
import UIKit
import Logging
class LogStreamerViewController: UIViewController, UITextViewDelegate {
private let textView = UITextView()
private let streamer: LogStreamer<UTF8>
private let logEntryParser = LogEntryParser()
private var currentTextColor: UIColor?
private let timestampFormatter: DateFormatter = {
let formatter = DateFormatter()
formatter.dateFormat = "HH:mm:ss.SSS"
return formatter
}()
private var autoScrollButtonItem: UIBarButtonItem {
return UIBarButtonItem(barButtonSystemItem: autoScroll ? .pause : .play, target: self, action: #selector(handleToggleAutoscroll(_:)))
}
private var dismissButtonItem: UIBarButtonItem {
return UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(handleDismissButton(_:)))
}
var autoScroll: Bool = true {
didSet {
updateAutoScrollBarItem()
handleAutoScroll()
}
}
init(fileURLs: [URL]) {
streamer = LogStreamer(fileURLs: fileURLs)
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
// MARK: - View lifecycle
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.title = NSLocalizedString("App logs", comment: "")
navigationItem.leftBarButtonItem = autoScrollButtonItem
navigationItem.rightBarButtonItem = dismissButtonItem
addSubviews()
startStreamer()
}
// MARK: - UITextViewDelegate
func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
let translation = scrollView.panGestureRecognizer.translation(in: scrollView.superview)
// Disable autoscroll if user scrolled up
if translation.y > 0 {
autoScroll = false
} else if translation.y < 0 {
// Enable autoscroll if user scrolled to the bottom of the view
let maxScrollY = scrollView.contentSize.height - scrollView.frame.height
if targetContentOffset.pointee.y >= maxScrollY {
autoScroll = true
}
}
}
func scrollViewShouldScrollToTop(_ scrollView: UIScrollView) -> Bool {
// Disable autoscroll when user requested scroll to top
autoScroll = false
return true
}
// MARK: - Private
private func addSubviews() {
textView.translatesAutoresizingMaskIntoConstraints = false
textView.isEditable = false
if #available(iOS 13.0, *) {
textView.font = UIFont.monospacedSystemFont(ofSize: UIFont.systemFontSize, weight: .regular)
} else {
textView.font = UIFont(name: "Courier", size: UIFont.systemFontSize)
}
textView.delegate = self
view.addSubview(textView)
NSLayoutConstraint.activate([
textView.topAnchor.constraint(equalTo: view.topAnchor),
textView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
textView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
textView.bottomAnchor.constraint(equalTo: view.bottomAnchor)
])
}
private func startStreamer() {
self.streamer.start { [weak self] (str) in
guard let self = self else { return }
DispatchQueue.main.async {
// Try parsing the entry
let entry = self.logEntryParser.parse(str)
// Since the log streamer sends the log file line-by-line, it's possible that only a
// part of a multiline message is captured at first.
let message = entry.map { (entry) -> String in
// Reformat the log entry date
let timestamp = self.timestampFormatter.string(from: entry.timestamp)
return "\(timestamp) \(entry.module) \(entry.message)\n"
} ?? "\(str)\n"
// Compute the range for replacing the text color
let start = self.textView.text.utf16.count
let end = start + message.utf16.count
let textRange = NSRange(start..<end)
self.textView.insertText(message)
self.handleAutoScroll()
// Update the current log entry color
if let logLevel = entry?.level {
self.currentTextColor = self.textColor(for: logLevel)
}
// Apply the color attribute to the inserted text
if let textColor = self.currentTextColor {
self.textView.textStorage.addAttributes([.foregroundColor: textColor], range: textRange)
}
}
}
}
private func handleAutoScroll() {
if autoScroll && !textView.isTracking && (!textView.isDragging || textView.isDecelerating) {
scrollToBottom()
}
}
private func scrollToBottom() {
let textRange = NSRange(..<textView.text.endIndex, in: textView.text)
textView.scrollRangeToVisible(textRange)
}
private func updateAutoScrollBarItem() {
navigationItem.leftBarButtonItem = autoScrollButtonItem
}
private func textColor(for logLevel: Logger.Level) -> UIColor {
switch logLevel {
case .debug, .trace:
return .lightGray
case .error, .critical:
return .red
case .info, .notice:
return .blue
case .warning:
return .orange
}
}
// MARK: - Actions
@objc func handleDismissButton(_ sender: Any) {
dismiss(animated: true)
}
@objc func handleToggleAutoscroll(_ sender: Any) {
autoScroll = !autoScroll
}
}
#endif
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