IndiTheo opened a new pull request, #76110:
URL: https://github.com/apache/airflow/pull/76110
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Continuation of: https://github.com/apache/airflow/pull/61643
## Summary
Adds a `callback` key to the callback context that carries a `CallbackMeta`
named tuple, letting shared callbacks tell whether they were triggered at the
DAG level or the task level.
- New `CallbackSource` str enum (`"dag"` / `"task"`) and `CallbackMeta`
named tuple in `airflow.sdk.definitions.context`
- Injects `context["callback"] = CallbackMeta(source=...)` in all four
callback invocation paths
- The `Context` TypedDict field is `NotRequired` because it is only set
during callback execution, not during normal task template rendering
- Both classes are exported from `airflow.sdk` for user access
### Usage example
```python
from airflow.sdk import CallbackMeta, CallbackSource
def my_callback(context):
if context["callback"].source == CallbackSource.DAG:
notify_team(f"DAG run finished: {context['reason']}")
else:
notify_team(f"Task {context['ti'].task_id} finished")
```
Using a `CallbackMeta` named tuple (instead of a bare enum) makes it easy to
add more metadata fields in the future without breaking existing callbacks.
* closes: https://github.com/apache/airflow/issues/61119
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