kaxil commented on code in PR #45727:
URL: https://github.com/apache/airflow/pull/45727#discussion_r1920476405
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task_sdk/src/airflow/sdk/execution_time/context.py:
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@@ -163,6 +174,114 @@ def __eq__(self, other: object) -> bool:
return True
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+class AssetAliasEvent:
+ """Representation of asset event to be triggered by an asset alias."""
+
+ source_alias_name: str
+ dest_asset_key: AssetUniqueKey
+ extra: dict[str, Any]
+
+
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+class OutletEventAccessor:
+ """Wrapper to access an outlet asset event in template."""
+
+ key: BaseAssetUniqueKey
+ extra: dict[str, Any] = attrs.Factory(dict)
+ asset_alias_events: list[AssetAliasEvent] = attrs.field(factory=list)
+
+ def add(self, asset: Asset, extra: dict[str, Any] | None = None) -> None:
+ """Add an AssetEvent to an existing Asset."""
+ if not isinstance(self.key, AssetAliasUniqueKey):
+ return
+
+ asset_alias_name = self.key.name
+ event = AssetAliasEvent(
+ source_alias_name=asset_alias_name,
+ dest_asset_key=AssetUniqueKey.from_asset(asset),
+ extra=extra or {},
+ )
+ self.asset_alias_events.append(event)
+
+
+def _get_asset(name: str | None = None, uri: str | None = None) -> Asset:
+ from airflow.sdk.definitions.asset import Asset
+ from airflow.sdk.execution_time.comms import ErrorResponse,
GetAssetByName, GetAssetByUri
+ from airflow.sdk.execution_time.task_runner import SUPERVISOR_COMMS
+
+ if name:
+ SUPERVISOR_COMMS.send_request(log=log, msg=GetAssetByName(name=name))
+ elif uri:
+ SUPERVISOR_COMMS.send_request(log=log, msg=GetAssetByUri(uri=uri))
+ else:
+ raise ValueError("Either name or uri must be provided")
+
+ msg = SUPERVISOR_COMMS.get_message()
+ if isinstance(msg, ErrorResponse):
+ raise AirflowRuntimeError(msg)
+
+ if TYPE_CHECKING:
+ assert isinstance(msg, AssetResult)
+ return Asset(**msg.model_dump(exclude={"type"}))
+
+
+class OutletEventAccessors(Mapping[Union[Asset, AssetAlias],
OutletEventAccessor]):
Review Comment:
It is because now we can reference an Asset without requiring original
`Asset` object using `Asset.ref` / `AssetRef` example:
`Asset.ref(name="inlet_asset_1")` for
[AIP-75](https://cwiki.apache.org/confluence/display/AIRFLOW/AIP-75+New+Asset-Centric+Syntax):
Was added in https://github.com/apache/airflow/pull/41325 & enhanced in
https://github.com/apache/airflow/pull/45028
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