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Add child workflow versioning overrides - #1944
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tconley1428
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@VegetarianOrc got you, rebase is needed. |
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Summary
Port temporalio/sdk-go#2707 to the Python SDK.
versioning_overridetoworkflow.start_child_workflowandworkflow.execute_child_workflow, including all overloads,ChildWorkflowConfig, and outbound interceptor propagation.common.OneTimeVersioningOverridefor routing an execution to a target deployment version until a workflow task completes there.exceptions.InvalidVersioningOverrideErrorwhen a child start fails because of an invalid override, following the existing Python child-start exception convention.Child workflow overrides require Temporal Server 1.32 or newer.
Validation
poe build-develop— passed.poe formatandpoe lint— passed, including Pyright, mypy, BasedPyright, formatting/import checks, and docstyle.poe test -s -n 0 tests/test_workflow.py tests/test_workflow_exports.py tests/test_common.py tests/worker/test_child_workflow_versioning.py tests/worker/test_worker.py::test_child_workflows_can_use_versioning_override— 52 passed.poe test -s -n 0 tests/worker/test_child_workflow_versioning.py tests/worker/test_workflow.py -k child— 25 passed, including 9 existing child-workflow regression tests.git diff --check— passed.Note
Medium Risk
Changes worker deployment routing for child workflows and depends on server 1.32 behavior; misconfigured overrides can fail child starts or route to unexpected build IDs, though the API is explicitly experimental.
Overview
Adds experimental child workflow versioning overrides so parents can pass
versioning_overridetoworkflow.start_child_workflowandworkflow.execute_child_workflow(includingChildWorkflowConfigand outbound interceptor input). The override takes precedence over versioning inherited from the parent and is serialized on the start-child command; Temporal Server 1.32+ is required.Introduces
common.OneTimeVersioningOverride, which routes tasks to a target deployment version until the first workflow task completes on that version, then clears the override (distinct from pinning). Nexus/proto helpers decode the newone_timeoverride shape.When the server rejects a child start for an invalid override, the worker maps the failure to
exceptions.InvalidVersioningOverrideError. Changelog and tests cover command encoding, failure mapping, Nexus round-trip, and deployment routing integration.Reviewed by Cursor Bugbot for commit 3bdf07f. Bugbot is set up for automated code reviews on this repo. Configure here.