[VertexAI] Add version info to the rest calls

[a-maurice]

Description

Provide details of the change, and generalize the change in the PR title above.

Adds the correct version info to the rest request headers. This uses reflection to get the information, since the properties are either internal or private, which prevents easier access.

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Testing

Describe how you've tested these changes.

Running locally

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Type of Change

Place an x the applicable box:

• Bug fix. Add the issue # below if applicable.
• New feature. A non-breaking change which adds functionality.
• Other, such as a build process or documentation change.

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[gemini-code-assist]

Hello @a-maurice, 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!

Summary of Changes

This pull request adds version information to the REST request headers for the VertexAI C# library. It uses reflection to access the internal Firebase.VersionInfo.SdkVersion property and includes it in the x-goog-api-client header. Additionally, if data collection is enabled, the Firebase App ID and version are added to the headers.

Highlights

• Version Info: Adds the Firebase SDK version to the x-goog-api-client header.
• Data Collection Headers: Adds X-Firebase-AppId and X-Firebase-AppVersion headers when data collection is enabled.
• Reflection: Uses reflection to access internal Firebase properties.

Changelog

Click here to see the changelog

• vertexai/src/GenerativeModel.cs
  • Added code to retrieve the Firebase SDK version using FirebaseInterops.GetVersionInfoSdkVersion().
  • Added the version to the x-goog-api-client header.
  • Conditionally added X-Firebase-AppId and X-Firebase-AppVersion headers based on the IsDataCollectionDefaultEnabled property.
• vertexai/src/Internal/FirebaseInterops.cs
  • Added InitializeAppReflection() to cache the IsDataCollectionDefaultEnabled property.
  • Added GetIsDataCollectionDefaultEnabled() to retrieve the value of the IsDataCollectionDefaultEnabled property.
  • Added GetVersionInfoSdkVersion() to retrieve the Firebase SDK version using reflection.
  • Initialized InitializeAppReflection() in the static constructor.
• vertexai/src/LiveGenerativeModel.cs
  • Added code to retrieve the Firebase SDK version using FirebaseInterops.GetVersionInfoSdkVersion().
  • Added the version to the x-goog-api-client header.
  • Conditionally added X-Firebase-AppId and X-Firebase-AppVersion headers based on the IsDataCollectionDefaultEnabled property.

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Through reflection's art,
Version's secret we impart,
Headers now complete,
Data's gentle beat,
SDK's tale, a brand new start.

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[gemini-code-assist]

Code Review

The pull request adds version information to the REST request headers, which is a valuable addition for tracking and debugging purposes. The implementation uses reflection to access the version information, which is necessary due to the properties being internal or private. The changes look good overall, but there are a few areas that could be improved.

Summary of Findings

• Error Handling in Reflection: The reflection logic includes error handling, but it could be more robust. Consider logging more detailed information about the exceptions encountered during reflection to aid in debugging.
• Redundancy in Version Retrieval: The version retrieval logic is duplicated in GenerativeModel.cs and LiveGenerativeModel.cs. Consider creating a shared method or constant to avoid redundancy.
• Potential NullReferenceException: In FirebaseInterops.GetIsDataCollectionDefaultEnabled, there's a potential for a NullReferenceException if _dataCollectionProperty is null. Adding a null check before accessing its GetValue method would improve robustness.

Merge Readiness

The pull request is almost ready for merging. Addressing the comments regarding error handling, redundancy, and potential NullReferenceException would improve the code quality and robustness. I am unable to directly approve this pull request, and recommend that others review and approve this code before merging.

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