83 lines
3.8 KiB
Python
83 lines
3.8 KiB
Python
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from datetime import UTC, datetime, timedelta
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from typing import Any
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from sqlalchemy import select
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from sqlalchemy.ext.asyncio import AsyncSession
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from app.model.memory import MemorySyncOutbox
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from app.service.graph_model import merge_node_clause, node_id, node_spec, relation_allowed
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from app.service.relationship_service import RelationshipService
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class GraphProjectionWorker:
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"""Projects approved domain events to Neo4j; callers provide durable dedup storage."""
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def __init__(
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self, relationships: RelationshipService, session: AsyncSession | None = None
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) -> None:
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self.relationships = relationships
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self.session = session
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self.processed_event_ids: set[str] = set()
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async def project(self, event_id: str, payload: dict[str, Any]) -> bool:
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if event_id in self.processed_event_ids:
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return False
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if self.session is not None:
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existing = await self.session.scalar(
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select(MemorySyncOutbox).where(MemorySyncOutbox.event_uuid == event_id)
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)
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if existing is not None and existing.status == "processed":
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return False
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relation = payload.get("relationship")
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if relation not in RelationshipService.ALLOWED_RELATIONSHIPS:
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raise ValueError("relationship is not allowed")
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# 节点按**类型**写标签与主属性：原先统一写 `:Entity {entity_id}`，而读服务查的是
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# `:Customer {customer_id}`，两侧从未对齐，写进去的关系永远读不出来。
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# 标签与属性名来自 `graph_model` 的受控常量，调用方传不进任意字符串。
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source_type = str(payload.get("source_type", "")).strip().lower()
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target_type = str(payload.get("target_type", "")).strip().lower()
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source = node_spec(source_type)
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target = node_spec(target_type)
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if not relation_allowed(relation, source_type, target_type):
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raise ValueError(
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f"relationship {relation} cannot connect {source_type} -> {target_type}"
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)
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query = (
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f"{merge_node_clause('a', source, 'source_id')} "
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f"{merge_node_clause('b', target, 'target_id')} "
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f"MERGE (a)-[r:{relation}]->(b) "
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"SET r.trace_id = $trace_id, r.confidence = $confidence, r.updated_at = $updated_at"
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)
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try:
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await self.relationships.driver.execute_query(
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query,
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source_id=node_id(source, payload["source_id"]),
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target_id=node_id(target, payload["target_id"]),
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trace_id=str(payload.get("trace_id", "")),
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confidence=float(payload.get("confidence", 0.0)),
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updated_at=datetime.now(UTC).replace(tzinfo=None).isoformat(),
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)
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except Exception as exc:
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if self.session is not None:
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record = await self.session.scalar(
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select(MemorySyncOutbox).where(MemorySyncOutbox.event_uuid == event_id)
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)
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if record is not None:
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record.retry_count += 1
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record.last_error = str(exc)[:500]
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record.status = "dead" if record.retry_count >= 5 else "pending"
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record.next_retry_at = datetime.now(UTC).replace(tzinfo=None) + timedelta(
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seconds=min(300, 2 ** record.retry_count)
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)
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await self.session.commit()
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raise
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self.processed_event_ids.add(event_id)
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if self.session is not None:
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record = await self.session.scalar(
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select(MemorySyncOutbox).where(MemorySyncOutbox.event_uuid == event_id)
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)
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if record is not None:
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record.status = "processed"
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await self.session.commit()
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return True
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