mirror of
https://github.com/yattee/yattee.git
synced 2026-10-30 08:27:17 +00:00
9412ca916c
Performance Logging (Developer settings) logs a resource sample every 5s in the foreground and background: CPU by area and thread, wakeups, GPU, memory, disk, activity counters as rates (mpv property updates, player time publishes, renders, saves, network, images, CloudKit events, log entries, main run-loop wakeups), SwiftUI body evaluations of the player views, and app/player/battery context. Each foreground/background transition logs a summary of the period. MetricKit metrics and diagnostics (CPU exceptions, hangs) are logged whenever logging is on. Background diagnostics (iOS) log lifecycle, audio session and power events with an app/player/render snapshot and a heartbeat that detects suspension gaps and main-thread stalls. Logs are persisted per session in Caches/Logs and the previous session is included in exports, so logs survive the app being swiped away.
95 lines
3.6 KiB
Swift
95 lines
3.6 KiB
Swift
//
|
|
// LogFileStore.swift
|
|
// Yattee
|
|
//
|
|
// Persists log entries to disk so a session's logs survive the app being
|
|
// killed and can be exported on the next launch.
|
|
//
|
|
|
|
import Foundation
|
|
|
|
/// Appends log entries to a per-session file in Caches/Logs.
|
|
///
|
|
/// The first use in a process rotates the last session's file to
|
|
/// `previous-session.log`, so the export after a relaunch still contains the
|
|
/// session that was killed. All file access happens on a private serial queue.
|
|
final class LogFileStore: @unchecked Sendable {
|
|
static let shared = LogFileStore()
|
|
|
|
/// Stop writing a session once it reaches this size.
|
|
private static let maxSessionBytes = 25 * 1024 * 1024
|
|
|
|
private let queue = DispatchQueue(label: "stream.yattee.logfile", qos: .utility)
|
|
private let currentURL: URL
|
|
private let previousURL: URL
|
|
private var handle: FileHandle?
|
|
private var bytesWritten = 0
|
|
private var reachedLimit = false
|
|
|
|
private let formatter: DateFormatter = {
|
|
let formatter = DateFormatter()
|
|
formatter.locale = Locale(identifier: "en_US_POSIX")
|
|
formatter.dateFormat = "yyyy-MM-dd HH:mm:ss.SSS"
|
|
return formatter
|
|
}()
|
|
|
|
private init() {
|
|
let directory = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask)[0]
|
|
.appendingPathComponent("Logs", isDirectory: true)
|
|
currentURL = directory.appendingPathComponent("current-session.log")
|
|
previousURL = directory.appendingPathComponent("previous-session.log")
|
|
|
|
queue.async { [self] in
|
|
let fileManager = FileManager.default
|
|
try? fileManager.createDirectory(at: directory, withIntermediateDirectories: true)
|
|
if fileManager.fileExists(atPath: currentURL.path) {
|
|
try? fileManager.removeItem(at: previousURL)
|
|
try? fileManager.moveItem(at: currentURL, to: previousURL)
|
|
}
|
|
fileManager.createFile(atPath: currentURL.path, contents: nil)
|
|
handle = try? FileHandle(forWritingTo: currentURL)
|
|
write("Session started: pid \(ProcessInfo.processInfo.processIdentifier), "
|
|
+ "\(Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String ?? "?") "
|
|
+ "(\(Bundle.main.infoDictionary?["CFBundleVersion"] as? String ?? "?"))\n")
|
|
}
|
|
}
|
|
|
|
func append(_ entry: LogEntry) {
|
|
queue.async { [self] in
|
|
let details = entry.details.map { "\n Details: \($0)" } ?? ""
|
|
write("[\(formatter.string(from: entry.timestamp))] [\(entry.level.rawValue.uppercased())] "
|
|
+ "[\(entry.category.rawValue)] \(entry.message)\(details)\n")
|
|
}
|
|
}
|
|
|
|
/// The previous session's log, or nil when there is none.
|
|
func previousSessionText() -> String? {
|
|
queue.sync {
|
|
guard let data = try? Data(contentsOf: previousURL) else { return nil }
|
|
return String(decoding: data, as: UTF8.self)
|
|
}
|
|
}
|
|
|
|
func clear() {
|
|
queue.async { [self] in
|
|
try? FileManager.default.removeItem(at: previousURL)
|
|
try? handle?.truncate(atOffset: 0)
|
|
bytesWritten = 0
|
|
reachedLimit = false
|
|
}
|
|
}
|
|
|
|
/// Must be called on `queue`.
|
|
private func write(_ line: String) {
|
|
guard let handle, !reachedLimit else { return }
|
|
let data = Data(line.utf8)
|
|
if bytesWritten + data.count > Self.maxSessionBytes {
|
|
reachedLimit = true
|
|
try? handle.write(contentsOf: Data("--- log size limit reached, further entries not written ---\n".utf8))
|
|
return
|
|
}
|
|
try? handle.write(contentsOf: data)
|
|
bytesWritten += data.count
|
|
}
|
|
}
|