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Only Workflows own streams and only Activities and clients read them in this release, so the rest raises StreamUnsupportedError with a clear message.
Here a later kind is refused with StreamUnsupportedError, so the decode test from p2d now expects that error instead of the interim ValueError.
# Conflicts: # temporalio/contrib/streams/__init__.py # tests/contrib/streams/test_outside_handles.py # tests/contrib/streams/test_topics_refs.py
A ref of a later release that arrives as Workflow input failed while it decoded, which fails the Workflow Task on every retry.
The handles and the writer were rewritten over Core, so the refusals of other owner kinds and of a Workflow read move onto the new code.
# Conflicts: # temporalio/contrib/streams/_handles.py # temporalio/contrib/streams/_workflow.py
Both branches touched the import block, and the merge kept P3c's, which lost the imports the Local Activity case uses.
moetemp
marked this pull request as draft
October 12, 2026 06:58
2 of 3 tasks
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What changed?
This PR raises
StreamUnsupportedErrorfor stream owners and readers outside this release.workflow_reader()always raisesStreamUnsupportedError.StreamRefof any kind decodes. Opening a handle on a kind other than"workflow"raises, and so doesactivity_handle()in an Activity with no Workflow.Why?
Only Workflow-owned streams ship, and Workflow consumption is out of scope (DD-2). A ref that fails to decode would fail a Workflow Task on every retry when it comes in as input. So the check runs where a handle opens.
How did you test it?
Link to a test plan if any -
tests/contrib/streams/test_unsupported_owners.pyandtest_topics_refs.py, on the dev server.