feat(transformations): add Fabric OneLake external data sources API#2713
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feat(transformations): add Fabric OneLake external data sources API#2713Khyat-Cognite wants to merge 5 commits into
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Adds client.transformations.external_data_sources as a new sub-resource under TransformationsAPI, enabling users to register, list, verify, and delete Fabric OneLake external data sources for use in transforms. OneLake sources are read-only — transforms read from OneLake tables via ext_onelake() SQL but writing back to OneLake is not supported. New public surface: - ExternalDataSourceWrite.onelake() factory for creating sources - client.transformations.external_data_sources.upsert() - client.transformations.external_data_sources.list() - client.transformations.external_data_sources.delete() - client.transformations.external_data_sources.verify_usability() - TransformationsExternalDataSourcesAcl capability class (READ/WRITE) Implementation follows the existing schedules/notifications sub-resource pattern: three-layer Core/Read/Write data class hierarchy, WriteList companion, sync wrapper generated from the async API, and autospec mock support in CogniteClientMock. Integration tests are local-only (require work/jetfire-backend/.env with Fabric credentials) and skip automatically in CI.
…ourcesAcl The /usability endpoint requires USE ACL on the backend — grants Spark driver access to verify credentials without granting full WRITE.
Align sync codegen hashes, docs stubs, list mixins, and HTTP mocks with jetfire external_data API behavior; fix Fabric integration env var names. Co-authored-by: Cursor <cursoragent@cursor.com>
Remove unpublished api-docs URLs from docstrings, apply ruff formatting, reorder data class exports, and refresh sync codegen hash. Co-authored-by: Cursor <cursoragent@cursor.com>
Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## master #2713 +/- ##
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+ Coverage 93.09% 93.61% +0.52%
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Files 490 509 +19
Lines 49869 51509 +1640
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+ Hits 46424 48220 +1796
+ Misses 3445 3289 -156
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External data classes are documented on transformations_external_data.rst; keeping the automodule in transformations.rst caused 23 Sphinx duplicate object warnings that fail linkcheck. Co-authored-by: Cursor <cursoragent@cursor.com>
This was referenced Jul 9, 2026
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Summary
client.transformations.external_data_sourcessub-resource withupsert(),list(),delete(), andverify_usability()methodsext_onelake()SQL; writing to OneLake is not supportedschedules/notificationssub-resource pattern: Core/Read/Write data class hierarchy, WriteList companion, sync wrapper, autospec mock supportTransformationsExternalDataSourcesAcl(READ/WRITE actions) to capabilitiesNew public surface
Files changed
cognite/client/data_classes/transformations/external_data.py— new data classescognite/client/_api/transformations/external_data.py— async APIcognite/client/_sync_api/transformations/external_data.py— sync wrappercognite/client/data_classes/capabilities.py—TransformationsExternalDataSourcesAclcognite/client/testing.py— mock spec for both async and sync clientsdocs/source/transformations_external_data.rst— Sphinx docs.envis absent)Test plan
pytest tests/tests_unit/test_data_classes/test_transformations/test_external_data.py tests/tests_unit/test_api/test_transformation_external_data.py -vpython -c "from cognite.client.data_classes import ExternalDataSource, ExternalDataSourceWrite"python -c "from cognite.client.testing import CogniteClientMock; m = CogniteClientMock(); print(m.transformations.external_data_sources)"python -c "from cognite.client.data_classes.capabilities import TransformationsExternalDataSourcesAcl"work/jetfire-backend/.env):pytest tests/tests_integration/test_api/test_transformations/test_external_data.py -vNotes
work/jetfire-backend/.envis absent. Adding Fabric credentials to SDK CI secrets is future work.dataSetIdvsdatasetIdcasing should be verified at integration test time (see architecture notes in the implementation)._capability_name = "transformationsExternalDataSourcesAcl"should be verified against the backend IAM configuration.poetry/ruffunavailable locally).