fix: retornando erro 503 com origem correta por banco

app/api/routes.py

@@ -1,6 +1,7 @@
 from typing import List, Dict, Any
 
-from fastapi import APIRouter, Depends
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.exc import SQLAlchemyError
 from sqlalchemy.orm import Session
 
 from app.api.schemas import (
@@ -32,6 +33,22 @@ def get_db():
     finally:
         db.close()
 
+
+def _db_error_detail(exc: SQLAlchemyError) -> str:
+    text = str(exc).lower()
+
+    # Heuristica para identificar falhas no MySQL (base ficticia).
+    mysql_markers = ("mysql", "pymysql", "(2003", "mock", "3306")
+    if any(marker in text for marker in mysql_markers):
+        return "Servico temporariamente indisponivel: banco MySQL (dados ficticios) inacessivel."
+
+    # Heuristica para identificar falhas no PostgreSQL (tools).
+    pg_markers = ("postgres", "psycopg", "postgresql", "5432", "tools")
+    if any(marker in text for marker in pg_markers):
+        return "Servico temporariamente indisponivel: banco PostgreSQL (tools) inacessivel."
+
+    return "Servico temporariamente indisponivel: erro de acesso ao banco de dados."
+
 '''
 # Removido momentaniamente para teste do Vertex IA
 @router.post("/chat", response_model=ChatResponse)
@@ -45,33 +62,48 @@ async def chat(request: ChatRequest, db: Session = Depends(get_db)):
 '''
 @router.post("/chat", response_model=ChatResponse)
 async def chat(request: ChatRequest, db: Session = Depends(get_db)):
-    service = OrquestradorService(db)
-
-    result = await service.handle_message(
-        message=request.message
-    )
-
-    return ChatResponse(response=result)
+    try:
+        service = OrquestradorService(db)
+        result = await service.handle_message(message=request.message)
+        return ChatResponse(response=result)
+    except SQLAlchemyError as exc:
+        raise HTTPException(
+            status_code=503,
+            detail=_db_error_detail(exc),
+        )
+    except ValueError as exc:
+        # Erros de configuracao de Vertex (regiao/projeto/modelo)
+        raise HTTPException(status_code=500, detail=f"Configuracao invalida do Vertex AI: {exc}")
+    except RuntimeError as exc:
+        raise HTTPException(status_code=503, detail=f"Falha temporaria no LLM/Vertex AI: {exc}")
 
 
 @router.post("/mock/consultar-estoque")
 async def consultar_estoque_endpoint(
     body: ConsultarEstoqueRequest,
 ) -> List[Dict[str, Any]]:
-    return await consultar_estoque(
-        preco_max=body.preco_max,
-        categoria=body.categoria,
-    )
+    try:
+        return await consultar_estoque(
+            preco_max=body.preco_max,
+            categoria=body.categoria,
+            ordenar_preco=body.ordenar_preco,
+            limite=body.limite,
+        )
+    except SQLAlchemyError as exc:
+        raise HTTPException(status_code=503, detail=_db_error_detail(exc))
 
 
 @router.post("/mock/validar-cliente-venda")
 async def validar_cliente_venda_endpoint(
     body: ValidarClienteVendaRequest,
 ) -> Dict[str, Any]:
-    return await validar_cliente_venda(
-        cpf=body.cpf,
-        valor_veiculo=body.valor_veiculo,
-    )
+    try:
+        return await validar_cliente_venda(
+            cpf=body.cpf,
+            valor_veiculo=body.valor_veiculo,
+        )
+    except SQLAlchemyError as exc:
+        raise HTTPException(status_code=503, detail=_db_error_detail(exc))
 
 
 @router.post("/mock/avaliar-veiculo-troca")
@@ -89,17 +121,23 @@ async def avaliar_veiculo_troca_endpoint(
 async def agendar_revisao_endpoint(
     body: AgendarRevisaoRequest,
 ) -> Dict[str, Any]:
-    return await agendar_revisao(
-        placa=body.placa,
-        data_hora=body.data_hora,
-    )
+    try:
+        return await agendar_revisao(
+            placa=body.placa,
+            data_hora=body.data_hora,
+        )
+    except SQLAlchemyError as exc:
+        raise HTTPException(status_code=503, detail=_db_error_detail(exc))
 
 
 @router.post("/mock/cancelar-pedido")
 async def cancelar_pedido_endpoint(
     body: CancelarPedidoRequest,
 ) -> Dict[str, Any]:
-    return await cancelar_pedido(
-        numero_pedido=body.numero_pedido,
-        motivo=body.motivo,
-    )
+    try:
+        return await cancelar_pedido(
+            numero_pedido=body.numero_pedido,
+            motivo=body.motivo,
+        )
+    except SQLAlchemyError as exc:
+        raise HTTPException(status_code=503, detail=_db_error_detail(exc))