Add graph DB lock to shared storage system

• Introduced new graph_db_lock
• Added detailed lock debugging output

lightrag/kg/shared_storage.py

@@ -7,11 +7,17 @@ from typing import Any, Dict, Optional, Union, TypeVar, Generic
 
 
 # Define a direct print function for critical logs that must be visible in all processes
-def direct_log(message, level="INFO"):
+def direct_log(message, level="INFO", enable_output: bool = True):
     """
     Log a message directly to stderr to ensure visibility in all processes,
     including the Gunicorn master process.
+    
+    Args:
+        message: The message to log
+        level: Log level (default: "INFO")
+        enable_output: Whether to actually output the log (default: True)
     """
+    if enable_output:
         print(f"{level}: {message}", file=sys.stderr, flush=True)
 
 
@@ -32,55 +38,88 @@ _update_flags: Optional[Dict[str, bool]] = None  # namespace -> updated
 _storage_lock: Optional[LockType] = None
 _internal_lock: Optional[LockType] = None
 _pipeline_status_lock: Optional[LockType] = None
+_graph_db_lock: Optional[LockType] = None
 
 
 class UnifiedLock(Generic[T]):
     """Provide a unified lock interface type for asyncio.Lock and multiprocessing.Lock"""
 
-    def __init__(self, lock: Union[ProcessLock, asyncio.Lock], is_async: bool):
+    def __init__(self, lock: Union[ProcessLock, asyncio.Lock], is_async: bool, name: str = "unnamed", enable_logging: bool = True):
         self._lock = lock
         self._is_async = is_async
+        self._pid = os.getpid()  # for debug only
+        self._name = name  # for debug only
+        self._enable_logging = enable_logging  # for debug only
 
     async def __aenter__(self) -> "UnifiedLock[T]":
+        try:
+            direct_log(f"== Lock == Process {self._pid}: Acquiring lock '{self._name}' (async={self._is_async})", enable_output=self._enable_logging)
             if self._is_async:
                 await self._lock.acquire()
             else:
                 self._lock.acquire()
+            direct_log(f"== Lock == Process {self._pid}: Lock '{self._name}' acquired (async={self._is_async})", enable_output=self._enable_logging)
             return self
+        except Exception as e:
+            direct_log(f"== Lock == Process {self._pid}: Failed to acquire lock '{self._name}': {e}", level="ERROR", enable_output=self._enable_logging)
+            raise
 
     async def __aexit__(self, exc_type, exc_val, exc_tb):
+        try:
+            direct_log(f"== Lock == Process {self._pid}: Releasing lock '{self._name}' (async={self._is_async})", enable_output=self._enable_logging)
             if self._is_async:
                 self._lock.release()
             else:
                 self._lock.release()
+            direct_log(f"== Lock == Process {self._pid}: Lock '{self._name}' released (async={self._is_async})", enable_output=self._enable_logging)
+        except Exception as e:
+            direct_log(f"== Lock == Process {self._pid}: Failed to release lock '{self._name}': {e}", level="ERROR", enable_output=self._enable_logging)
+            raise
 
     def __enter__(self) -> "UnifiedLock[T]":
         """For backward compatibility"""
+        try:
             if self._is_async:
                 raise RuntimeError("Use 'async with' for shared_storage lock")
+            direct_log(f"== Lock == Process {self._pid}: Acquiring lock '{self._name}' (sync)", enable_output=self._enable_logging)
             self._lock.acquire()
+            direct_log(f"== Lock == Process {self._pid}: Lock '{self._name}' acquired (sync)", enable_output=self._enable_logging)
             return self
+        except Exception as e:
+            direct_log(f"== Lock == Process {self._pid}: Failed to acquire lock '{self._name}' (sync): {e}", level="ERROR", enable_output=self._enable_logging)
+            raise
 
     def __exit__(self, exc_type, exc_val, exc_tb):
         """For backward compatibility"""
+        try:
             if self._is_async:
                 raise RuntimeError("Use 'async with' for shared_storage lock")
+            direct_log(f"== Lock == Process {self._pid}: Releasing lock '{self._name}' (sync)", enable_output=self._enable_logging)
             self._lock.release()
+            direct_log(f"== Lock == Process {self._pid}: Lock '{self._name}' released (sync)", enable_output=self._enable_logging)
+        except Exception as e:
+            direct_log(f"== Lock == Process {self._pid}: Failed to release lock '{self._name}' (sync): {e}", level="ERROR", enable_output=self._enable_logging)
+            raise
 
 
-def get_internal_lock() -> UnifiedLock:
+def get_internal_lock(enable_logging: bool = False) -> UnifiedLock:
     """return unified storage lock for data consistency"""
-    return UnifiedLock(lock=_internal_lock, is_async=not is_multiprocess)
+    return UnifiedLock(lock=_internal_lock, is_async=not is_multiprocess, name="internal_lock", enable_logging=enable_logging)
 
 
-def get_storage_lock() -> UnifiedLock:
+def get_storage_lock(enable_logging: bool = False) -> UnifiedLock:
     """return unified storage lock for data consistency"""
-    return UnifiedLock(lock=_storage_lock, is_async=not is_multiprocess)
+    return UnifiedLock(lock=_storage_lock, is_async=not is_multiprocess, name="storage_lock", enable_logging=enable_logging)
 
 
-def get_pipeline_status_lock() -> UnifiedLock:
+def get_pipeline_status_lock(enable_logging: bool = False) -> UnifiedLock:
     """return unified storage lock for data consistency"""
-    return UnifiedLock(lock=_pipeline_status_lock, is_async=not is_multiprocess)
+    return UnifiedLock(lock=_pipeline_status_lock, is_async=not is_multiprocess, name="pipeline_status_lock", enable_logging=enable_logging)
+
+
+def get_graph_db_lock(enable_logging: bool = False) -> UnifiedLock:
+    """return unified graph database lock for ensuring atomic operations"""
+    return UnifiedLock(lock=_graph_db_lock, is_async=not is_multiprocess, name="graph_db_lock", enable_logging=enable_logging)
 
 
 def initialize_share_data(workers: int = 1):
@@ -108,6 +147,7 @@ def initialize_share_data(workers: int = 1):
         _storage_lock, \
         _internal_lock, \
         _pipeline_status_lock, \
+        _graph_db_lock, \
         _shared_dicts, \
         _init_flags, \
         _initialized, \
@@ -128,6 +168,7 @@ def initialize_share_data(workers: int = 1):
         _internal_lock = _manager.Lock()
         _storage_lock = _manager.Lock()
         _pipeline_status_lock = _manager.Lock()
+        _graph_db_lock = _manager.Lock()
         _shared_dicts = _manager.dict()
         _init_flags = _manager.dict()
         _update_flags = _manager.dict()
@@ -139,6 +180,7 @@ def initialize_share_data(workers: int = 1):
         _internal_lock = asyncio.Lock()
         _storage_lock = asyncio.Lock()
         _pipeline_status_lock = asyncio.Lock()
+        _graph_db_lock = asyncio.Lock()
         _shared_dicts = {}
         _init_flags = {}
         _update_flags = {}
@@ -304,6 +346,7 @@ def finalize_share_data():
         _storage_lock, \
         _internal_lock, \
         _pipeline_status_lock, \
+        _graph_db_lock, \
         _shared_dicts, \
         _init_flags, \
         _initialized, \
@@ -369,6 +412,7 @@ def finalize_share_data():
     _storage_lock = None
     _internal_lock = None
     _pipeline_status_lock = None
+    _graph_db_lock = None
     _update_flags = None
 
     direct_log(f"Process {os.getpid()} storage data finalization complete")