chore(flagd): refine typing by adding types-grpcio

[gruebel]

This PR

• type changes are all internal

[gemini-code-assist]

Summary of Changes

Hello @gruebel, 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 focuses on refining the type annotations and overall type safety within the flagd Python provider, particularly for its gRPC interactions. By integrating types-grpcio and introducing explicit type definitions for gRPC call arguments, the changes aim to make the codebase more robust and easier to maintain through improved static analysis. Additionally, internal method overloads have been added to provide more precise type information for flag resolution logic.

Highlights

• Enhanced Type Safety for gRPC: The flagd provider now includes types-grpcio as a development dependency, significantly improving type checking for gRPC-related code. This addition allows for more robust static analysis and reduces potential runtime errors.
• Refactored gRPC Channel Creation: The grpc.secure_channel calls have been refactored to explicitly pass credentials and options as named arguments, moving away from dictionary unpacking. This change enhances type inference and code readability.
• New TypedDict for gRPC Call Arguments: A new GrpcMultiCallableArgs TypedDict has been introduced to define the expected arguments for gRPC multi-callable methods, such as EventStream and SyncFlags. This provides clearer type hints for gRPC method parameters.
• Improved _resolve Method Type Overloads: The _resolve method in grpc.py now utilizes typing.overload decorators to provide more precise type hints for its return values, depending on the default_value type. This improves the accuracy of type checking for flag resolution.
• Mypy Dependency Update: The mypy development dependency has been updated to version 1.18.0 in the root pyproject.toml, ensuring compatibility with the latest type checking features and improvements.

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[codecov]

Codecov Report

❌ Patch coverage is 96.15385% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 94.56%. Comparing base (fe8130a) to head (14c85b5).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../flagd/resolvers/process/connector/grpc_watcher.py	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #308      +/-   ##
==========================================
+ Coverage   94.41%   94.56%   +0.15%     
==========================================
  Files          21       22       +1     
  Lines        1057     1068      +11     
==========================================
+ Hits          998     1010      +12     
+ Misses         59       58       -1     

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[gemini-code-assist]

Code Review

This pull request effectively refines the typing within the flagd provider by introducing types-grpcio. This allows for stricter type checking of gRPC calls, which is a great improvement for code quality and maintainability. The changes, including removing the grpc.* ignore from mypy configuration and adding typing.overload to the _resolve method, are well-executed. The refactoring of grpc.secure_channel calls also enhances readability. I've included a couple of minor suggestions to make the initialization of gRPC call arguments more concise.