fix: proper requests mapping

[cristipufu]

No description provided.

[cristipufu]

/help review

[cristipufu]

/ai generated [2846679021]

Code Review for PR #84: "fix: proper requests mapping"

Files Changed

1. pyproject.toml

• Version bump from 0.0.76 to 0.0.77.

2. src/uipath_mcp/_cli/_runtime/_session.py

• Substantial changes to the session server logic, specifically around how request/response mapping is handled for JSON-RPC messages.

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Review

Good Practices & Improvements

1. Request/Response Mapping

   • The PR introduces a dictionary _active_requests to map message IDs to request IDs, which is a significant improvement for tracking and correlating requests and responses in asynchronous communication.
   • The logic for handling responses now checks if a response message can be mapped to a specific request ID, and only falls back to the last known request ID if no mapping is found. This is a robust approach for handling out-of-order or concurrent requests.

2. Helper Methods

   • The addition of _is_request, _is_response, and _get_message_id methods improves code readability and maintainability by encapsulating type checks and ID extraction.

3. Error Handling

   • Error handling remains consistent, with clear logging and exception raising for server errors (HTTP 5xx).

4. Code Organization

   • The refactoring of message queue handling (removing the tuple (message, request_id) in favor of just message) simplifies the queue logic and reduces potential for mismatches.

Potential Issues & Suggestions

1. Type Annotations

   • _last_request_id is initialized as None but not typed. It would be clearer to annotate it as Optional[str] for better type safety and readability.

2. Thread Safety

   • The _active_requests dictionary is accessed from asynchronous contexts. While Python's dict is not thread-safe, in asyncio single-threaded event loops this is generally safe, but if the code ever runs in a multi-threaded context, this could be a source of bugs. Consider documenting this assumption.

3. Fallback to Last Request ID

   • When a response message does not have a mapping in _active_requests, the code falls back to _last_request_id. This could potentially lead to mismatches if multiple requests are in flight. If possible, log a warning when this fallback occurs to aid debugging.

4. Docstrings

   • The new helper methods have minimal docstrings. Consider expanding them to clarify their purpose, especially for future maintainers.

5. Unit Tests

   • There is no indication of new or updated tests for this logic. Given the complexity of request/response mapping, tests for concurrent requests, out-of-order responses, and fallback scenarios would be valuable.

6. Minor: Logging

   • When a mapping is not found and fallback is used, a debug or warning log would help trace potential issues in production.

Summary

• The changes are a clear improvement for robust request/response mapping in an asynchronous JSON-RPC context.
• The code is more maintainable and less error-prone, but would benefit from explicit type annotations, additional logging, and expanded tests.
• No breaking changes are apparent, and the version bump is appropriate.

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Recommendation:
Approve with minor suggestions for type annotation, logging, and tests. No blocking issues found.

[cristipufu]

/help summarize

[cristipufu]

/ai generated [2846717142]

Summary of PR #84 ("fix: proper requests mapping")

• Updates the session server logic in src/uipath_mcp/_cli/_runtime/_session.py to improve how JSON-RPC requests and responses are mapped.
• Introduces a dictionary to track active requests by message ID, ensuring responses are correctly matched to their originating requests.
• Refactors helper methods for identifying and extracting message IDs, improving code clarity.
• Simplifies the message queue by storing only messages (not message/request ID tuples).
• Bumps the package version in pyproject.toml from 0.0.76 to 0.0.77.
• No new tests or documentation changes are included.

[cristipufu]

/help test

[cristipufu]

/ai generated [2846719464]

Based on the changes in src/uipath_mcp/_cli/_runtime/_session.py, here are detailed test suggestions to ensure the new request/response mapping logic works as intended:

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1. Test: Request/Response Mapping

• Goal: Ensure that when multiple requests are sent, responses are correctly matched to their originating requests using the _active_requests mapping.
• How:
  • Simulate sending two or more requests with different IDs.
  • Simulate receiving responses with matching IDs in any order.
  • Assert that each response is routed using the correct request_id and that the mapping is cleaned up after use.

2. Test: Fallback to Last Request ID

• Goal: Verify that if a response arrives with an ID not present in _active_requests, the system falls back to _last_request_id.
• How:
  • Simulate a response with an unknown ID.
  • Assert that _send_message is called with _last_request_id.

3. Test: Mapping Cleanup

• Goal: Ensure that after a response is processed, its entry is removed from _active_requests.
• How:
  • Send a request, receive a response, and check that the mapping for that ID no longer exists.

4. Test: Helper Methods

• Goal: Validate the correctness of _is_request, _is_response, and _get_message_id.
• How:
  • Pass various message types (request, response, error, unrelated) and assert correct identification and ID extraction.

5. Test: Message Queue Handling

• Goal: Ensure that the message queue only contains messages (not tuples) and that messages are processed in the correct order.
• How:
  • Enqueue several messages and assert that they are dequeued and sent as expected.

6. Test: Concurrent Requests

• Goal: Simulate concurrent requests and out-of-order responses to ensure mapping logic is robust.
• How:
  • Send multiple requests, receive responses in a different order, and assert correct routing.

7. Test: Error Handling

• Goal: Ensure that server errors (HTTP 5xx) raise exceptions as expected.
• How:
  • Mock the API client to return 5xx responses and assert that exceptions are raised.

8. Test: Logging (Optional)

• Goal: If logging is important for debugging, ensure that appropriate log messages are emitted when falling back to _last_request_id or when errors occur.

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Note:
Mocking of the UiPath API client and the message types (types.JSONRPCMessage, etc.) will be necessary for isolated unit tests. Consider using pytest and unittest.mock for these tests.

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Summary:
These tests will help ensure the new request/response mapping logic is robust, correct, and maintainable.