feat: 初始提交

backend/app/services/llm_config_service.py

@@ -0,0 +1,41 @@
+from typing import Optional
+
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from ..models import LLMConfig
+from ..repositories.llm_config_repository import LLMConfigRepository
+from ..schemas.llm_config import LLMConfigCreate, LLMConfigRead
+
+
+class LLMConfigService:
+    """用户自定义 LLM 配置服务。"""
+
+    def __init__(self, session: AsyncSession):
+        self.session = session
+        self.repo = LLMConfigRepository(session)
+
+    async def upsert_config(self, user_id: int, payload: LLMConfigCreate) -> LLMConfigRead:
+        instance = await self.repo.get_by_user(user_id)
+        data = payload.model_dump(exclude_unset=True)
+        if "llm_provider_url" in data and data["llm_provider_url"] is not None:
+            # HttpUrl 类型在 sqlite 中无法直接写入，需要提前转为字符串
+            data["llm_provider_url"] = str(data["llm_provider_url"])
+        if instance:
+            await self.repo.update_fields(instance, **data)
+        else:
+            instance = LLMConfig(user_id=user_id, **data)
+            await self.repo.add(instance)
+        await self.session.commit()
+        return LLMConfigRead.model_validate(instance)
+
+    async def get_config(self, user_id: int) -> Optional[LLMConfigRead]:
+        instance = await self.repo.get_by_user(user_id)
+        return LLMConfigRead.model_validate(instance) if instance else None
+
+    async def delete_config(self, user_id: int) -> bool:
+        instance = await self.repo.get_by_user(user_id)
+        if not instance:
+            return False
+        await self.repo.delete(instance)
+        await self.session.commit()
+        return True