refactor: update GDA source and tool to use Cloud Go SDK

[wangauone]

Description

Refactor GDA source and tool to use Cloud Go SDK to simplify the implementation, given the SDK has included the recent changes.

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[gemini-code-assist]

Summary of Changes

Hello @wangauone, 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 significantly refactors the Gemini Data Analytics (GDA) integration by transitioning from a custom HTTP client implementation to the official Cloud Go SDK. This change streamlines the codebase, enhances maintainability, and ensures direct compatibility with the latest GDA API definitions through the SDK's protobuf structures. The refactoring simplifies how requests are constructed and responses are handled, making the GDA source and tool more robust and easier to manage.

Highlights

• SDK Adoption: The Gemini Data Analytics (GDA) source and tool have been refactored to utilize the official Cloud Go SDK, specifically cloud.google.com/go/geminidataanalytics.
• Code Simplification: Manual HTTP client creation, request marshalling, and response unmarshalling logic have been removed, replaced by the SDK's client and protobuf message types.
• Dependency Update: The go.mod file has been updated to reflect the new version of the GDA SDK, moving from v0.3.0 to v0.5.0.
• API Request/Response Standardization: Custom Go structs previously defining GDA API request and response bodies have been removed, with the implementation now directly using the protobuf types provided by the SDK.
• Testing Refinement: Test suites have been updated to align with the SDK-based implementation, replacing HTTP server mocks with a fakeSource that directly interacts with SDK protobufs.

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Ignored Files

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  • go.sum

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[gemini-code-assist]

Code Review

This pull request is a great refactoring that updates the Gemini Data Analytics (GDA) source and tool to use the official Cloud Go SDK. This change significantly simplifies the implementation by removing manual HTTP request handling and replacing it with SDK calls. The code is now cleaner, more maintainable, and less prone to errors. The tests have also been updated to reflect these changes and are now more robust as they are decoupled from the transport layer details. I've found a couple of minor opportunities to improve error handling consistency, but overall, this is a high-quality contribution.