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Add comprehensive unit tests for GCS storage provider #4

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7f54923
Add comprehensive unit tests for GCS storage provider
SanabriaRusso Sep 4, 2025
29e1a5a
Fix code formatting to pass CI checks
SanabriaRusso Sep 4, 2025
76d7980
Updated CHANGELOG.md to comply with STORAGE_BACKENDS.md
SanabriaRusso Sep 4, 2025
9985d43
Fix GCS test failures and clean up warnings - Fix test_error_messag…
SanabriaRusso Sep 4, 2025
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41 changes: 41 additions & 0 deletions CHANGELOG.md
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# Changelog

## [Storage Backend Support] - 2024-Sep-04

### Added

- **Google Cloud Storage (GCS) Backend**: Complete GCS integration as alternative to AWS S3
- Storage provider abstraction with pluggable backends (AWS S3, GCS)
- Anonymous access for public GCS buckets (no credentials required)
- Authentication fallback: tries authenticated access first, falls back to anonymous HTTP
- Configuration via `STORAGE_PROVIDER=gcs` and `GCS_PROJECT_ID` environment variables
- Support for direct JSON files (.json) alongside compressed archives (.tar.gz)

- **Comprehensive Unit Testing**: Full test suite for storage operations
- Mock HTTP responses for GCS API testing
- Authentication scenarios and error handling (404, 401, 403)
- Bucket validation warnings and pagination testing
- Storage factory configuration validation

- **Enhanced Error Handling**: Improved debugging and error messages
- Provider-specific error context and configuration guidance
- Bucket name validation with helpful warnings
- Enhanced logging for storage operations and hash matching

### Improvements

- **Storage Architecture Refactor**: Clean provider pattern supporting multiple backends
- **Performance**: Efficient pagination for large buckets (4,250+ objects tested)
- **Configuration**: Simplified provider switching via environment variables
- **Dependencies**: Added GCS SDK support (`google-cloud-storage`, `google-cloud-auth`)

### Backward Compatibility

- **✅ Zero Breaking Changes**: All existing AWS S3 configurations work unchanged
- **✅ Environment Variables**: AWS S3 environment variables remain functional
- **✅ API Compatibility**: No REST API changes
- **✅ Migration Path**: Switch providers by updating environment variables only

### Current Limitations

- **Service Account Key File Loading**: `GCS_SERVICE_ACCOUNT_KEY_PATH` field exists but not implemented
- **Private GCS Buckets**: Limited to Google ADC environments only

## [o1Labs-infra] - 2025-Jun-12

### Added
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