feat: allow the runner to automatically create a session if AutoCreateSession is enabled.

[hanorik]

This change introduces an AutoCreateSession configuration option to the Runner. When enabled, the Runner.Run method will automatically create a new session if the requested session ID is not found, instead of returning an error. This aligns the behavior with the Python ADK. Also added TestRunner_AutoCreateSession test to verify expected behavior across four scenarios.

[gemini-code-assist]

Summary of Changes

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This pull request enhances the Runner's session management by introducing an AutoCreateSession configuration. When enabled, the Runner.Run method will now automatically provision a new session if the specified session ID does not exist, rather than returning an error. This change aligns the Runner's behavior with the existing Python ADK, improving consistency and user experience by reducing boilerplate for session initialization.

Highlights

• New Configuration Option: Introduced an AutoCreateSession boolean field to the runner.Config struct, allowing users to configure automatic session creation.
• Automatic Session Creation Logic: Implemented logic within the Runner.Run method to automatically create a new session if AutoCreateSession is enabled and the requested session ID is not found, aligning behavior with the Python ADK.
• Comprehensive Testing: Added a new test suite, TestRunner_AutoCreateSession, which covers four distinct scenarios to thoroughly validate the new automatic session creation functionality.

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Changelog

• runner/runner.go
  • Added AutoCreateSession boolean field to Config struct.
  • Initialized autoCreateSession field in New function.
  • Added autoCreateSession boolean field to Runner struct.
  • Modified Run method to check autoCreateSession and create a new session if Get fails and the option is enabled.
• runner/runner_test.go
  • Added TestRunner_AutoCreateSession function to test the AutoCreateSession functionality with four distinct test cases.

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[gemini-code-assist]

Code Review

This pull request introduces an AutoCreateSession option to the Runner. The implementation correctly adds the configuration and a new field to the Runner struct. The core logic in Runner.Run is updated to create a session if it doesn't exist when this option is enabled. The accompanying test TestRunner_AutoCreateSession is well-written and covers the expected scenarios.

I have two points of feedback. First, a minor style inconsistency in a comment. Second, and more importantly, a potential issue in the error handling logic for session creation. The current implementation could attempt to create a session on any error from sessionService.Get, not just when a session is not found, which could mask other problems. Please see my detailed comments.