"""跨平台文件锁实现（基于 filelock 库）"""
from pathlib import Path
from filelock import FileLock, Timeout
from ..file_manager import get_lock_file
class BackendLock:
"""后端单例文件锁"""
def __init__(self, project_root: Path):
self.lock_file = get_lock_file(project_root)
self._lock = FileLock(str(self.lock_file), timeout=0)
def acquire(self) -> bool:
"""尝试获取独占锁，成功返回 True"""
try:
self.lock_file.parent.mkdir(parents=True, exist_ok=True)
self._lock.acquire(blocking=False)
return True
except Timeout:
return False
def write_info(self, pid: int, port: int):
"""写入后端信息到锁文件中"""
self.lock_file.write_text(f"{pid}\n{port}\n")
def release(self):
"""释放锁并删除锁文件"""
try:
if self._lock.is_locked:
self._lock.release()
self.lock_file.unlink(missing_ok=True)
except Exception:
pass
