feat(librariangen): add bazel package

[meltsufin]

Based on https://github.com/googleapis/google-cloud-go/tree/main/internal/librariangen/bazel with adaptation for Java.

[gemini-code-assist]

Summary of Changes

Hello @meltsufin, 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 capability to parse Bazel BUILD.bazel files, specifically focusing on java_gapic_library rules. This allows the librariangen tool to dynamically read and interpret configuration parameters directly from Bazel build definitions, such as service YAML paths and transport types. The change aims to streamline the generation process for Java GAPIC clients by integrating Bazel's declarative configuration into the generation workflow, ensuring that the generated clients adhere to the specified build settings.

Highlights

• New Bazel Package: Introduced a new bazel package within internal/librariangen to handle Bazel-specific configurations.
• Bazel BUILD File Parsing: Added functionality to parse BUILD.bazel files, specifically targeting java_gapic_library rules to extract relevant configuration parameters.
• Configuration Extraction: The parser extracts key attributes such as grpc_service_config, service_yaml, transport, and rest_numeric_enums from the java_gapic_library rule.
• Configuration Validation: Implemented validation logic for the extracted configuration, ensuring that necessary fields like serviceYAML are present when a GAPIC client is to be generated.
• Comprehensive Testing: Included a dedicated test file (parser_test.go) with various test cases covering successful parsing, handling of different attribute formats, configuration validation, and scenarios where no GAPIC library is defined.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.81%. Comparing base (598de06) to head (4b8f854).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3940      +/-   ##
==========================================
- Coverage   94.02%   93.81%   -0.22%     
==========================================
  Files           4        5       +1     
  Lines         134      194      +60     
==========================================
+ Hits          126      182      +56     
- Misses          6        9       +3     
- Partials        2        3       +1     

Flag	Coverage Δ
librariangen	93.81% <ø> (-0.22%)	⬇️

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[gemini-code-assist]

Code Review

This pull request introduces a new Bazel configuration parser for librariangen, specifically for java_gapic_library rules. The implementation uses regular expressions to extract configuration values, which is a pragmatic approach for this use case. The changes are well-tested. My review includes suggestions to improve performance by pre-compiling and caching regular expressions, to use the slog logging library more idiomatically, and to enhance the structure of tests for clearer reporting.

[meltsufin]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces a new Bazel parser for librariangen to extract configuration from BUILD.bazel files. The implementation is a good start, but my review focuses on improving the robustness and concurrency safety of the parsing logic. I've suggested changes to handle different quoting styles in Bazel files, make boolean parsing more resilient to prevent silent failures, and fix a race condition in the regular expression caching mechanism.

[sonarqubecloud]

Quality Gate passed for 'gapic-generator-java-root'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sonarqubecloud]

Quality Gate passed for 'java_showcase_integration_tests'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud