Improve VPN status reporting and recovery

2026-10-13 06:53:52 +03:00
parent fdb15ae462
commit 7a716b4c9c
188 changed files with 6953 additions and 1911 deletions
@@ -0,0 +1,38 @@
+import Foundation
+
+/// One current file and one bounded archive. The owning process serializes writes.
+struct BoundedLog {
+    let url: URL
+    var maxBytes = 5 * 1024 * 1024
+
+    func append(_ line: String) throws {
+        let files = FileManager.default
+        try files.createDirectory(at: url.deletingLastPathComponent(), withIntermediateDirectories: true)
+        if !files.fileExists(atPath: url.path) {
+            guard files.createFile(atPath: url.path, contents: nil, attributes: [.posixPermissions: 0o600]) else {
+                throw CocoaError(.fileWriteUnknown)
+            }
+        }
+        try files.setAttributes([.posixPermissions: 0o600], ofItemAtPath: url.path)
+        let handle = try FileHandle(forUpdating: url)
+        defer { try? handle.close() }
+        let size = try handle.seekToEnd()
+        let data = Data(line.utf8).suffix(maxBytes)
+        let archive = url.appendingPathExtension("1")
+        var archiveSize: UInt64 = 0
+        if files.fileExists(atPath: archive.path) {
+            try files.setAttributes([.posixPermissions: 0o600], ofItemAtPath: archive.path)
+            archiveSize = (try files.attributesOfItem(atPath: archive.path)[.size] as? NSNumber)?.uint64Value ?? 0
+        }
+        if size + UInt64(data.count) > UInt64(maxBytes) || archiveSize > UInt64(maxBytes) {
+            try handle.seek(toOffset: size > UInt64(maxBytes) ? size - UInt64(maxBytes) : 0)
+            let tail = try handle.read(upToCount: maxBytes) ?? Data()
+            guard files.createFile(atPath: archive.path, contents: tail, attributes: [.posixPermissions: 0o600]) else {
+                throw CocoaError(.fileWriteUnknown)
+            }
+            try handle.truncate(atOffset: 0)
+            try handle.seek(toOffset: 0)
+        }
+        try handle.write(contentsOf: data)
+    }
+}