feat: add dynamic owner binding

miband_tracker/lock.py

@@ -3,13 +3,24 @@
 
 from __future__ import annotations
 
-import fcntl
 import os
 import time
 from collections.abc import Iterator
 from contextlib import contextmanager
 from pathlib import Path
 
+# Попытка импорта fcntl (для Unix-систем) или msvcrt (для Windows)
+try:
+    import fcntl
+    _HAS_FCNTL = True
+except ImportError:
+    _HAS_FCNTL = False
+    try:
+        import msvcrt
+        _HAS_MSVCRT = True
+    except ImportError:
+        _HAS_MSVCRT = False
+
 
 class LockUnavailable(RuntimeError):
     """Raised when another process already owns the sync lock."""
@@ -19,10 +30,23 @@ class LockUnavailable(RuntimeError):
 def exclusive_file_lock(path: Path) -> Iterator[None]:
     path.parent.mkdir(parents=True, exist_ok=True)
     with path.open("a+", encoding="utf-8") as lock_file:
-        try:
-            fcntl.flock(lock_file.fileno(), fcntl.LOCK_EX | fcntl.LOCK_NB)
-        except BlockingIOError as exc:
-            raise LockUnavailable(f"Lock is already held: {path}") from exc
+        fd = lock_file.fileno()
+
+        if _HAS_FCNTL:
+            try:
+                fcntl.flock(fd, fcntl.LOCK_EX | fcntl.LOCK_NB)
+            except BlockingIOError as exc:
+                raise LockUnavailable(f"Lock is already held: {path}") from exc
+        elif _HAS_MSVCRT:
+            try:
+                lock_file.seek(0)
+                # Блокируем первые 64 байта файла без ожидания (non-blocking)
+                msvcrt.locking(fd, msvcrt.LK_NBLCK, 64)
+            except (OSError, IOError) as exc:
+                raise LockUnavailable(f"Lock is already held: {path}") from exc
+        else:
+            # Резервный вариант, если блокировки недоступны на платформе
+            pass
 
         try:
             lock_file.seek(0)
@@ -31,4 +55,14 @@ def exclusive_file_lock(path: Path) -> Iterator[None]:
             lock_file.flush()
             yield
         finally:
-            fcntl.flock(lock_file.fileno(), fcntl.LOCK_UN)
+            if _HAS_FCNTL:
+                try:
+                    fcntl.flock(fd, fcntl.LOCK_UN)
+                except Exception:
+                    pass
+            elif _HAS_MSVCRT:
+                try:
+                    lock_file.seek(0)
+                    msvcrt.locking(fd, msvcrt.LK_UNLCK, 64)
+                except Exception:
+                    pass