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Refactor Neo4JStorage methods for robustness and clarity.

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- Add error handling and resource cleanup
- Improve method documentation
- Optimize result consumption
This commit is contained in:
yangdx
2025-03-08 10:19:20 +08:00
parent fcb04e47e5
commit 84222b8b76
1 changed files with 255 additions and 157 deletions
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180
lightrag/kg/neo4j_impl.py
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@@ -163,13 +163,14 @@ class Neo4JStorage(BaseGraphStorage):
}
async def close(self):
"""Close the Neo4j driver and release all resources"""
if self._driver:
await self._driver.close()
self._driver = None
async def __aexit__(self, exc_type, exc, tb):
if self._driver:
await self._driver.close()
"""Ensure driver is closed when context manager exits"""
await self.close()
async def index_done_callback(self) -> None:
# Noe4J handles persistence automatically
@@ -187,25 +188,58 @@ class Neo4JStorage(BaseGraphStorage):
return clean_label
async def has_node(self, node_id: str) -> bool:
"""
Check if a node with the given label exists in the database
Args:
node_id: Label of the node to check
Returns:
bool: True if node exists, False otherwise
Raises:
ValueError: If node_id is invalid
Exception: If there is an error executing the query
"""
entity_name_label = await self._ensure_label(node_id)
async with self._driver.session(
database=self._DATABASE, default_access_mode="READ"
) as session:
query = (
f"MATCH (n:`{entity_name_label}`) RETURN count(n) > 0 AS node_exists"
)
try:
query = f"MATCH (n:`{entity_name_label}`) RETURN count(n) > 0 AS node_exists"
result = await session.run(query)
single_result = await result.single()
await result.consume() # Ensure result is fully consumed
return single_result["node_exists"]
except Exception as e:
logger.error(
f"Error checking node existence for {entity_name_label}: {str(e)}"
)
await result.consume() # Ensure results are consumed even on error
raise
async def has_edge(self, source_node_id: str, target_node_id: str) -> bool:
entity_name_label_source = source_node_id.strip('"')
entity_name_label_target = target_node_id.strip('"')
"""
Check if an edge exists between two nodes
Args:
source_node_id: Label of the source node
target_node_id: Label of the target node
Returns:
bool: True if edge exists, False otherwise
Raises:
ValueError: If either node_id is invalid
Exception: If there is an error executing the query
"""
entity_name_label_source = await self._ensure_label(source_node_id)
entity_name_label_target = await self._ensure_label(target_node_id)
async with self._driver.session(
database=self._DATABASE, default_access_mode="READ"
) as session:
try:
query = (
f"MATCH (a:`{entity_name_label_source}`)-[r]-(b:`{entity_name_label_target}`) "
"RETURN COUNT(r) > 0 AS edgeExists"
@@ -214,6 +248,12 @@ class Neo4JStorage(BaseGraphStorage):
single_result = await result.single()
await result.consume() # Ensure result is fully consumed
return single_result["edgeExists"]
except Exception as e:
logger.error(
f"Error checking edge existence between {entity_name_label_source} and {entity_name_label_target}: {str(e)}"
)
await result.consume() # Ensure results are consumed even on error
raise
async def get_node(self, node_id: str) -> dict[str, str] | None:
"""Get node by its label identifier.
@@ -224,17 +264,23 @@ class Neo4JStorage(BaseGraphStorage):
Returns:
dict: Node properties if found
None: If node not found
Raises:
ValueError: If node_id is invalid
Exception: If there is an error executing the query
"""
entity_name_label = await self._ensure_label(node_id)
async with self._driver.session(
database=self._DATABASE, default_access_mode="READ"
) as session:
entity_name_label = await self._ensure_label(node_id)
try:
query = f"MATCH (n:`{entity_name_label}`) RETURN n"
result = await session.run(query)
try:
records = await result.fetch(
2
) # Get up to 2 records to check for duplicates
await result.consume() # Ensure result is fully consumed
if len(records) > 1:
logger.warning(
f"Multiple nodes found with label '{entity_name_label}'. Using first node."
@@ -247,6 +293,11 @@ class Neo4JStorage(BaseGraphStorage):
)
return node_dict
return None
finally:
await result.consume() # Ensure result is fully consumed
except Exception as e:
logger.error(f"Error getting node for {entity_name_label}: {str(e)}")
raise
async def node_degree(self, node_id: str) -> int:
"""Get the degree (number of relationships) of a node with the given label.
@@ -258,23 +309,30 @@ class Neo4JStorage(BaseGraphStorage):
Returns:
int: The number of relationships the node has, or 0 if no node found
Raises:
ValueError: If node_id is invalid
Exception: If there is an error executing the query
"""
entity_name_label = node_id.strip('"')
entity_name_label = await self._ensure_label(node_id)
async with self._driver.session(
database=self._DATABASE, default_access_mode="READ"
) as session:
try:
query = f"""
MATCH (n:`{entity_name_label}`)
OPTIONAL MATCH (n)-[r]-()
RETURN n, COUNT(r) AS degree
"""
result = await session.run(query)
try:
records = await result.fetch(100)
await result.consume() # Ensure result is fully consumed
if not records:
logger.warning(f"No node found with label '{entity_name_label}'")
logger.warning(
f"No node found with label '{entity_name_label}'"
)
return 0
if len(records) > 1:
@@ -287,10 +345,27 @@ class Neo4JStorage(BaseGraphStorage):
f"{inspect.currentframe().f_code.co_name}:query:{query}:result:{degree}"
)
return degree
finally:
await result.consume() # Ensure result is fully consumed
except Exception as e:
logger.error(
f"Error getting node degree for {entity_name_label}: {str(e)}"
)
raise
async def edge_degree(self, src_id: str, tgt_id: str) -> int:
entity_name_label_source = src_id.strip('"')
entity_name_label_target = tgt_id.strip('"')
"""Get the total degree (sum of relationships) of two nodes.
Args:
src_id: Label of the source node
tgt_id: Label of the target node
Returns:
int: Sum of the degrees of both nodes
"""
entity_name_label_source = await self._ensure_label(src_id)
entity_name_label_target = await self._ensure_label(tgt_id)
src_degree = await self.node_degree(entity_name_label_source)
trg_degree = await self.node_degree(entity_name_label_target)
@@ -299,17 +374,27 @@ class Neo4JStorage(BaseGraphStorage):
trg_degree = 0 if trg_degree is None else trg_degree
degrees = int(src_degree) + int(trg_degree)
logger.debug(
f"{inspect.currentframe().f_code.co_name}:query:src_Degree+trg_degree:result:{degrees}"
)
return degrees
async def get_edge(
self, source_node_id: str, target_node_id: str
) -> dict[str, str] | None:
"""Get edge properties between two nodes.
Args:
source_node_id: Label of the source node
target_node_id: Label of the target node
Returns:
dict: Edge properties if found, default properties if not found or on error
Raises:
ValueError: If either node_id is invalid
Exception: If there is an error executing the query
"""
try:
entity_name_label_source = source_node_id.strip('"')
entity_name_label_target = target_node_id.strip('"')
entity_name_label_source = await self._ensure_label(source_node_id)
entity_name_label_target = await self._ensure_label(target_node_id)
async with self._driver.session(
database=self._DATABASE, default_access_mode="READ"
@@ -320,8 +405,10 @@ class Neo4JStorage(BaseGraphStorage):
"""
result = await session.run(query)
records = await result.fetch(2) # Get up to 2 records to check for duplicates
await result.consume() # Ensure result is fully consumed before processing records
try:
records = await result.fetch(
2
) # Get up to 2 records to check for duplicates
if len(records) > 1:
logger.warning(
@@ -358,9 +445,9 @@ class Neo4JStorage(BaseGraphStorage):
# Return default edge properties on error
return {
"weight": 0.0,
"source_id": None,
"description": None,
"keywords": None,
"source_id": None,
}
logger.debug(
@@ -369,39 +456,47 @@ class Neo4JStorage(BaseGraphStorage):
# Return default edge properties when no edge found
return {
"weight": 0.0,
"source_id": None,
"description": None,
"keywords": None,
"source_id": None,
}
finally:
await result.consume() # Ensure result is fully consumed
except Exception as e:
logger.error(
f"Error in get_edge between {source_node_id} and {target_node_id}: {str(e)}"
)
# Return default edge properties on error
return {
"weight": 0.0,
"description": None,
"keywords": None,
"source_id": None,
}
raise
async def get_node_edges(self, source_node_id: str) -> list[tuple[str, str]] | None:
node_label = source_node_id.strip('"')
"""Retrieves all edges (relationships) for a particular node identified by its label.
Args:
source_node_id: Label of the node to get edges for
Returns:
list[tuple[str, str]]: List of (source_label, target_label) tuples representing edges
None: If no edges found
Raises:
ValueError: If source_node_id is invalid
Exception: If there is an error executing the query
"""
Retrieves all edges (relationships) for a particular node identified by its label.
:return: List of dictionaries containing edge information
"""
try:
node_label = await self._ensure_label(source_node_id)
query = f"""MATCH (n:`{node_label}`)
OPTIONAL MATCH (n)-[r]-(connected)
RETURN n, r, connected"""
async with self._driver.session(
database=self._DATABASE, default_access_mode="READ"
) as session:
try:
results = await session.run(query)
edges = []
try:
async for record in results:
source_node = record["n"]
connected_node = record["connected"]
@@ -417,12 +512,16 @@ class Neo4JStorage(BaseGraphStorage):
if source_label and target_label:
edges.append((source_label, target_label))
finally:
await (
results.consume()
) # Ensure results are consumed even if processing fails
return edges
await results.consume() # Ensure results are consumed
return edges if edges else None
except Exception as e:
logger.error(f"Error getting edges for node {node_label}: {str(e)}")
await results.consume() # Ensure results are consumed even on error
raise
except Exception as e:
logger.error(f"Error in get_node_edges for {source_node_id}: {str(e)}")
raise
@retry(
stop=stop_after_attempt(3),
@@ -838,7 +937,6 @@ class Neo4JStorage(BaseGraphStorage):
RETURN DISTINCT label
ORDER BY label
"""
result = await session.run(query)
labels = []
try: