feat: implement a SimpleRequestContextBuilder for building RequestContext

[yumosx]

implement a SimpleRequestContextBuilder for building RequestContext

ref #18

[gemini-code-assist]

Summary of Changes

Hello @yumosx, 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 SimpleRequestContextBuilder in the a2asrv package, designed to streamline the creation and population of RequestContext objects. It enhances the RequestContextBuilder interface to include error handling and provides robust mechanisms for managing task and context IDs, including fetching and validating related tasks from a TaskStore.

Highlights

• Enhanced RequestContextBuilder Interface: The Build method of the RequestContextBuilder interface now returns an error, allowing for better error propagation during context construction.
• Introduction of SimpleRequestContextBuilder: A new concrete implementation, SimpleRequestContextBuilder, is added to facilitate the creation of RequestContext instances, with options to populate related tasks.
• Robust RequestContext Creation: A new NewRequestContext function is introduced to handle the generation of TaskID and ContextID for new requests, or to validate existing ones, ensuring consistency.
• Related Task Management: The SimpleRequestContextBuilder can fetch and validate referenced tasks from a TaskStore, ensuring that only non-terminal related tasks are included in the RequestContext.
• Utility for Terminal Task States: A helper function IsTerminalStates is added to identify if a given a2a.TaskState represents a terminal state, used in validating referenced tasks.
• IDE Configuration Ignored: The .gitignore file has been updated to include .idea directories, preventing IDE-specific files from being committed.

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[gemini-code-assist]

Code Review

This pull request introduces a SimpleRequestContextBuilder for creating RequestContext instances. The implementation is a good start, but there are a few key areas that need attention. I've identified a potential logic issue in how terminal task states are determined, some areas where error handling could be more specific, and a case of input parameter mutation that could lead to side effects. Most importantly, the new functionality lacks unit tests, which is critical for ensuring its correctness and robustness. My detailed comments provide suggestions for addressing these points.

[gemini-code-assist]

The IsTerminalStates function includes a2a.TaskStateInputRequired as a terminal state. Typically, a state requiring input means the task is paused and waiting for more information to proceed, rather than being in a final, unchangeable state. Including it here might lead to incorrect behavior where tasks waiting for input are treated as completed or failed. Please consider removing TaskStateInputRequired from this check.

Suggested change

	state == a2a.TaskStateUnknown ||
	state == a2a.TaskStateInputRequired
	state == a2a.TaskStateUnknown

[gemini-code-assist]

This pull request introduces significant new logic in SimpleRequestContextBuilder and NewRequestContext, including error handling, ID generation, and interaction with a TaskStore. However, no unit tests have been added to verify this functionality. Please add comprehensive tests covering success paths, error conditions (e.g., task not found, task in terminal state), and edge cases to ensure the new code is robust and correct.

[gemini-code-assist]

The error message "bad task id" is a bit generic. For better debugging, consider making it more specific to indicate that the task ID from the request message doesn't match the provided task's ID.

Suggested change

	return RequestContext{}, errors.New("bad task id")
	return RequestContext{}, errors.New("request message task ID does not match provided task ID")

[gemini-code-assist]

This error message "bad task id" is generic and misleading, as it's checking the ContextID. It would be more helpful if it specified that the context ID from the request message doesn't match the provided task's context ID.

Suggested change

	return RequestContext{}, errors.New("bad task id")
	return RequestContext{}, errors.New("request message context ID does not match provided task context ID")

[gemini-code-assist]

This function modifies the request parameter by updating request.Message.TaskID and request.Message.ContextID. Modifying input parameters can lead to unexpected side effects for the caller. It's generally better to treat input parameters as immutable. Consider creating a copy of request.Message if it needs to be modified, or at least clearly document this behavior in the function's comment.