airflow branch 源码
airflow branch 代码
文件路径：/airflow/operators/branch.py
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"""Branching operators"""
from __future__ import annotations
from typing import Iterable
from airflow.models.baseoperator import BaseOperator
from airflow.models.skipmixin import SkipMixin
from airflow.utils.context import Context
class BaseBranchOperator(BaseOperator, SkipMixin):
"""
This is a base class for creating operators with branching functionality,
similarly to BranchPythonOperator.
Users should subclass this operator and implement the function
`choose_branch(self, context)`. This should run whatever business logic
is needed to determine the branch, and return either the task_id for
a single task (as a str) or a list of task_ids.
The operator will continue with the returned task_id(s), and all other
tasks directly downstream of this operator will be skipped.
"""
def choose_branch(self, context: Context) -> str | Iterable[str]:
"""
Subclasses should implement this, running whatever logic is
necessary to choose a branch and returning a task_id or list of
task_ids.
:param context: Context dictionary as passed to execute()
"""
raise NotImplementedError
def execute(self, context: Context):
branches_to_execute = self.choose_branch(context)
self.skip_all_except(context['ti'], branches_to_execute)
return branches_to_execute
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