feat: add user agent to embeddings generation

[averikitsch]

Description

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impact, along with a summary of the solution

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🛠️ Fixes #<issue_number_goes_here>

[gemini-code-assist]

Summary of Changes

Hello @averikitsch, 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 introduces a new feature to automatically include a user agent string in HTTP requests made by the Gemini embedding model. This enhancement improves the traceability and observability of API calls by providing client-side identification, which can be crucial for monitoring and debugging purposes.

Highlights

• User Agent Integration: Implemented the retrieval of a user agent string from the context and configured it as an HTTP header for requests made by the Gemini embedding model client.
• Enhanced Observability: This change allows for better identification and tracking of requests originating from the embedding model, aiding in debugging and analytics.
• Test Coverage: Added new unit tests to ensure the correct behavior of the Initialize method, specifically verifying user agent handling and error scenarios.

Changelog

• internal/embeddingmodels/gemini/gemini.go
  • Imported the net/http package.
  • Retrieved the user agent string from the context using util.UserAgentFromContext.
  • Configured the User-Agent HTTP header in the genai.HTTPOptions for the Gemini client.
• internal/embeddingmodels/gemini/gemini_test.go
  • Added TestInitialize function to test the Initialize method.
  • Included a sub-test to verify that Initialize fails when no user agent is present in the context.
  • Included a sub-test to verify that Initialize succeeds when a user agent is present in the context.

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[gemini-code-assist]

Code Review

This pull request adds the user agent to the Gemini embedding model initialization. The changes look good and are accompanied by tests. I have a couple of suggestions to improve error handling and make the tests more robust.

[averikitsch]

/gemini review

[gemini-code-assist]

Code Review

This pull request adds a User-Agent header to requests made by the Gemini embedding model client. The change correctly retrieves the user agent from the context and adds it to the HTTP options. My feedback focuses on improving the error handling by properly wrapping the error when the user agent cannot be retrieved from the context, which is a best practice for error management in Go.