Add XCom read access to callback supervisor comms channel#66611
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seanghaeli wants to merge 1 commit intoapache:mainfrom
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Add XCom read access to callback supervisor comms channel#66611seanghaeli wants to merge 1 commit intoapache:mainfrom
seanghaeli wants to merge 1 commit intoapache:mainfrom
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Callbacks running inside the CallbackSubprocess can now read XCom values via the same supervisor IPC mechanism used for Connections and Variables. The caller must supply explicit dag_id, run_id, and task_id since callbacks have no implicit task context. This adds GetXCom to the CallbackToSupervisor union and routes it through a new shared handle_get_xcom handler in request_handlers.py. Only read access (GetXCom) is exposed; SetXCom and DeleteXCom remain out of scope for callbacks.
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Add read-only XCom access to the callback supervisor IPC channel, allowing
callbacks to fetch XCom values from upstream tasks via the same mechanism
used for Connections and Variables.
Motivation
PR #65269 added Connection, Variable, and MaskSecret comms channels to the
callback supervisor. XCom was deferred because it requires explicit dag_id,
run_id, and task_id (callbacks have no implicit task context). This PR adds
that missing piece.
Changes
GetXComto theCallbackToSupervisorunion typehandle_get_xcomshared handler inrequest_handlers.pyGetXCommessages inCallbackSubprocess._handle_requestOnly read access (GetXCom) is exposed. SetXCom and DeleteXCom remain out of
scope for callbacks since they should not be producing XCom values.
related: #65269
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