chore(wren-ai-service): sql2answer-minor-update (#691)

* allow auto-refresh

* update var name

* leave comment for vertex ai model support

wren-ai-service/pyproject.toml

@@ -30,6 +30,7 @@ sqlglot = "==25.18.0"
 cachetools = "==5.5.0"
 pyyaml = "==6.0.2"
 pydantic-settings = "==2.5.2"
+google-auth = "==2.35.0"
 
 [tool.poetry.group.dev.dependencies]
 pre-commit = "==3.7.1"

wren-ai-service/src/providers/llm/openai.py

@@ -3,6 +3,8 @@
 from typing import Any, Callable, Dict, List, Optional, Union
 
 import backoff
+import google.auth
+import google.auth.transport.requests
 import openai
 import orjson
 from haystack import component
@@ -57,6 +59,29 @@ def __init__(
             base_url=api_base_url,
         )
 
+        # check if the model is actually Vertex AI model
+        # currently we support Vertex AI through openai api compatible way
+        # in the near future, we might use litellm instead, so we can more easily support different kinds of llm providers
+        # this is workaround as of now
+        self._vertexai_creds = None
+        if model.startswith("google/"):
+            self._vertexai_creds, _ = google.auth.default(
+                scopes=["https://www.googleapis.com/auth/cloud-platform"]
+            )
+
+    def __getattr__(self, name: str) -> Any:
+        # dealing with auto-refreshing expired credential for Vertex AI model
+        # https://cloud.google.com/vertex-ai/generative-ai/docs/multimodal/call-vertex-using-openai-library#refresh_your_credentials
+        if self._vertexai_creds and not self._vertexai_creds.valid:
+            auth_req = google.auth.transport.requests.Request()
+            self._vertexai_creds.refresh(auth_req)
+
+            if not self._vertexai_creds.valid:
+                raise RuntimeError("Unable to refresh auth")
+
+            self.client.api_key = self._vertexai_creds.token
+        return getattr(self.client, name)
+
     @component.output_types(replies=List[str], meta=List[Dict[str, Any]])
     @backoff.on_exception(backoff.expo, openai.RateLimitError, max_time=60, max_tries=3)
     async def run(
@@ -151,11 +176,11 @@ def get_generator(
     ):
         if self._api_base == LLM_OPENAI_API_BASE:
             logger.info(
-                f"Creating OpenAI generator with model kwargs: {self._model_kwargs}"
+                f"Creating OpenAI generator {self._generation_model} with model kwargs: {self._model_kwargs}"
             )
         else:
             logger.info(
-                f"Creating OpenAI API-compatible generator with model kwargs: {self._model_kwargs}"
+                f"Creating OpenAI API-compatible generator {self._generation_model} with model kwargs: {self._model_kwargs}"
             )
 
         return AsyncGenerator(