feat(api-core): add get_universe_domain helper to universe.py - #17799
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This pull request introduces helper functions get_universe_domain, get_default_mtls_endpoint, and get_api_endpoint in universe.py to handle universe domain resolution and mTLS endpoint conversion, along with corresponding unit tests. Feedback was provided to avoid using hardcoded magic numbers (-23 and -15) when slicing the host string in get_default_mtls_endpoint, suggesting dynamic calculation based on suffix lengths instead.
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daniel-sanche
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This PR refactors the generated client templates to utilize centralized endpoint routing and universe domain logic. * **Helper Relocation**: Moved `_get_default_mtls_endpoint`, `_get_api_endpoint`, and `_get_universe_domain` from generated client classes to the compatibility layer (`_compat.py`). * **Backward Compatibility**: Implemented these helpers locally in `_compat.py` to maintain compatibility with older `google-api-core` versions, laying groundwork for importing directly from `google.api_core.universe` (centralized in PR #17799) once the minimum dependency is bumped. * **Test Migration**: Moved unit tests for these routing functions from `test_%service.py.j2` to `test_compat.py.j2`. Towards: #17883
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Description
This PR consolidates and centralizes all universe-related configuration helpers and routing logic into
google/api_core/universe.py. This avoids pollutinggapic_v1with duplicate routing logic and keeps universe/endpoint utilities unified.Changes:
get_universe_domainthat accepts*potential_universesin order of preference.default_universea required keyword-only argument to align with other client helpers.determine_domainto wrapget_universe_domainto preserve backward compatibility.get_api_endpointandget_default_mtls_endpointfrom thegapic_v1.client_utilsnamespace intogoogle/api_core/universe.py.tests/unit/test_universe.py.