impl(bigtable): generate AsyncPingAndWarm method

[scotthart]

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[gemini-code-assist]

Summary of Changes

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This pull request integrates the AsyncPingAndWarm method into the Google Cloud Bigtable C++ client library. The changes involve updating the service definition, implementing the asynchronous method across the core stub and its various internal decorators, and ensuring proper handling of authentication, channel management, logging, metadata, and tracing. This enhancement provides clients with a new asynchronous capability to interact with Bigtable instances for ping and warm operations.

Highlights

• New Async Method: Introduced the AsyncPingAndWarm method across the Bigtable client library, enabling asynchronous ping and warm operations.
• Service Configuration Update: Updated the generator_config.textproto to include PingAndWarm in the list of services, allowing for its generation.
• Decorator Pattern Implementation: Implemented the AsyncPingAndWarm method in various internal decorator classes, including authentication, channel refresh, logging, metadata, and round-robin decorators, ensuring consistent behavior and feature integration.
• Metadata Routing: Added metadata routing logic for AsyncPingAndWarm to correctly handle name and app_profile_id parameters.
• Tracing Integration: Integrated OpenTelemetry tracing for the new AsyncPingAndWarm method to provide observability.
• Testing Support: Added a mock method for AsyncPingAndWarm in the testing framework to facilitate unit and integration testing.

Changelog

• generator/generator_config.textproto
  • Added "PingAndWarm" to the list of services.
• google/cloud/bigtable/internal/bigtable_auth_decorator.cc
  • Implemented the AsyncPingAndWarm method with authentication logic.
• google/cloud/bigtable/internal/bigtable_auth_decorator.h
  • Declared the AsyncPingAndWarm method in the BigtableAuth class.
• google/cloud/bigtable/internal/bigtable_channel_refresh.cc
  • Implemented the AsyncPingAndWarm method for channel refresh.
• google/cloud/bigtable/internal/bigtable_channel_refresh.h
  • Declared the AsyncPingAndWarm method in the BigtableChannelRefresh class.
• google/cloud/bigtable/internal/bigtable_logging_decorator.cc
  • Implemented the AsyncPingAndWarm method with logging.
• google/cloud/bigtable/internal/bigtable_logging_decorator.h
  • Declared the AsyncPingAndWarm method in the BigtableLogging class.
• google/cloud/bigtable/internal/bigtable_metadata_decorator.cc
  • Implemented the AsyncPingAndWarm method with metadata routing for name and app_profile_id.
• google/cloud/bigtable/internal/bigtable_metadata_decorator.h
  • Declared the AsyncPingAndWarm method in the BigtableMetadata class.
• google/cloud/bigtable/internal/bigtable_round_robin_decorator.cc
  • Implemented the AsyncPingAndWarm method for round-robin distribution.
• google/cloud/bigtable/internal/bigtable_round_robin_decorator.h
  • Declared the AsyncPingAndWarm method in the BigtableRoundRobin class.
• google/cloud/bigtable/internal/bigtable_stub.cc
  • Implemented the default AsyncPingAndWarm method.
• google/cloud/bigtable/internal/bigtable_stub.h
  • Declared the virtual AsyncPingAndWarm method in BigtableStub and DefaultBigtableStub.
• google/cloud/bigtable/internal/bigtable_tracing_stub.cc
  • Implemented the AsyncPingAndWarm method with OpenTelemetry tracing.
• google/cloud/bigtable/internal/bigtable_tracing_stub.h
  • Declared the AsyncPingAndWarm method in the BigtableTracingStub class.
• google/cloud/bigtable/testing/mock_bigtable_stub.h
  • Added a mock declaration for the AsyncPingAndWarm method.

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[gemini-code-assist]

Code Review

This pull request implements the AsyncPingAndWarm method for the Bigtable service. The changes are mostly generated code, stemming from an update to the generator configuration. I've reviewed the generated code across all the stub decorators (auth, channel refresh, logging, metadata, round-robin, and tracing), as well as the base stub implementation and the mock stub for testing. The implementation is consistent with the existing asynchronous methods in the codebase and appears to be correct. No issues were found.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.63%. Comparing base (ced8a7c) to head (e58a71c).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...loud/bigtable/internal/bigtable_channel_refresh.cc	0.00%	3 Missing ⚠️
google/cloud/bigtable/testing/mock_bigtable_stub.h	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16026      +/-   ##
==========================================
- Coverage   92.63%   92.63%   -0.01%     
==========================================
  Files        2333     2333              
  Lines      214631   214635       +4     
==========================================
+ Hits       198827   198829       +2     
- Misses      15804    15806       +2     

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