fix: limit idevice log file size

StikDebug/App/AppBootstrapper.swift

@@ -9,6 +9,7 @@ import UIKit
 
 enum AppBootstrapper {
     static func configure() {
+        IdeviceLogFileManager.shared.prepareForLogging()
         registerDefaultSettings()
         startConfiguredKeepAliveServices()
         applyDocumentPickerCopyWorkaround()

StikDebug/Device/JITEnableContext.swift

@@ -82,11 +82,7 @@ final class JITEnableContext {
     var handshakeHandle: OpaquePointer? { handshake }
 
     private init() {
-        let logURL = FileManager.default
+        var path = Array(IdeviceLogFileManager.logURL.path.utf8CString)
-            .urls(for: .documentDirectory, in: .userDomainMask)[0]
-            .appendingPathComponent("idevice_log.txt")
-
-        var path = Array(logURL.path.utf8CString)
         path.withUnsafeMutableBufferPointer { buffer in
             _ = idevice_init_logger(Info, Debug, buffer.baseAddress)
         }

StikDebug/Services/IdeviceLogFileManager.swift

@@ -0,0 +1,66 @@
+//
+//  IdeviceLogFileManager.swift
+//  StikDebug
+//
+
+import Foundation
+
+final class IdeviceLogFileManager {
+    static let shared = IdeviceLogFileManager()
+    static let logURL = URL.documentsDirectory.appendingPathComponent("idevice_log.txt")
+
+    private static let maximumSize: UInt64 = 20 * 1024 * 1024
+    private static let retainedSize: UInt64 = 10 * 1024 * 1024
+    private static let checkInterval: TimeInterval = 5
+
+    private let queue = DispatchQueue(label: "com.stik.ideviceLogFile", qos: .utility)
+    private var timer: DispatchSourceTimer?
+
+    private init() {}
+
+    func prepareForLogging() {
+        compactIfNeeded()
+
+        queue.async {
+            guard self.timer == nil else { return }
+
+            let timer = DispatchSource.makeTimerSource(queue: self.queue)
+            timer.schedule(deadline: .now() + Self.checkInterval, repeating: Self.checkInterval)
+            timer.setEventHandler { [weak self] in
+                self?.compactIfNeeded()
+            }
+            self.timer = timer
+            timer.resume()
+        }
+    }
+
+    private func compactIfNeeded() {
+        let fileManager = FileManager.default
+        guard let attributes = try? fileManager.attributesOfItem(atPath: Self.logURL.path),
+              let fileSize = attributes[.size] as? NSNumber,
+              fileSize.uint64Value > Self.maximumSize,
+              let handle = try? FileHandle(forUpdating: Self.logURL) else {
+            return
+        }
+
+        defer { try? handle.close() }
+
+        do {
+            let endOffset = try handle.seekToEnd()
+            let startOffset = endOffset > Self.retainedSize ? endOffset - Self.retainedSize : 0
+            try handle.seek(toOffset: startOffset)
+            var recentData = try handle.readToEnd() ?? Data()
+
+            if startOffset > 0, let newlineIndex = recentData.firstIndex(of: 0x0A) {
+                recentData.removeSubrange(recentData.startIndex...newlineIndex)
+            }
+
+            try handle.truncate(atOffset: 0)
+            try handle.seek(toOffset: 0)
+            try handle.write(contentsOf: recentData)
+            try handle.synchronize()
+        } catch {
+            return
+        }
+    }
+}

StikDebug/Views/ConsoleLogsView.swift

@@ -266,7 +266,7 @@ struct ConsoleLogsView: View {
 
     @ViewBuilder
     private var exportMenuOption: some View {
-        let logURL: URL = URL.documentsDirectory.appendingPathComponent("idevice_log.txt")
+        let logURL = IdeviceLogFileManager.logURL
         if FileManager.default.fileExists(atPath: logURL.path) {
             ShareLink(
                 item: logURL,
@@ -309,7 +309,7 @@ struct ConsoleLogsView: View {
         guard !isLoadingLogs else { return }
         isLoadingLogs = true
 
-        let logPath = URL.documentsDirectory.appendingPathComponent("idevice_log.txt").path
+        let logPath = IdeviceLogFileManager.logURL.path
 
         guard FileManager.default.fileExists(atPath: logPath) else {
             await MainActor.run {
@@ -368,7 +368,7 @@ struct ConsoleLogsView: View {
         guard !isLoadingLogs else { return }
         isLoadingLogs = true
 
-        let logPath = URL.documentsDirectory.appendingPathComponent("idevice_log.txt").path
+        let logPath = IdeviceLogFileManager.logURL.path
         let previousCount = lastProcessedLineCount
 
         guard FileManager.default.fileExists(atPath: logPath) else {