Update vertex_ai_session_service.py

[yeesian]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @yeesian, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the internal API client initialization within the Vertex AI session service. The change simplifies how the underlying API client is obtained, moving from an indirect access through a wrapper client to a direct instantiation of the base client. This improves clarity and potentially efficiency in client management.

Highlights

• API Client Instantiation: The _get_api_client method in vertex_ai_session_service.py has been updated to directly instantiate genai.client.BaseApiClient instead of genai.Client()._api_client. This change streamlines the client creation process by using the base client directly.

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[gemini-code-assist]

Code Review

This pull request refactors the API client instantiation in vertex_ai_session_service.py to avoid using a private _api_client attribute. This is a good improvement for maintainability. My review includes a suggestion to further improve the method by also removing another private attribute access, if possible.

[gemini-code-assist]

This change to use genai.client.BaseApiClient directly is a good improvement for maintainability. To make this even more robust, consider passing http_options to the BaseApiClient constructor. This would allow removing the subsequent modification of the private _http_options attribute, making the code cleaner and less coupled to the library's internal implementation.

[yeesian]

This is meant for testing purposes, and not for merging