airflow outputs 源码
airflow outputs 代码
文件路径：/airflow/mypy/plugin/outputs.py
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
from __future__ import annotations
from typing import Callable
from mypy.plugin import AttributeContext, MethodContext, Plugin
from mypy.types import AnyType, Type, TypeOfAny
OUTPUT_PROPERTIES = {
"airflow.models.baseoperator.BaseOperator.output",
"airflow.models.mappedoperator.MappedOperator.output",
}
TASK_CALL_FUNCTIONS = {
"airflow.decorators.base.Task.__call__",
}
class OperatorOutputPlugin(Plugin):
"""Plugin to convert XComArg to the runtime type.
This allows us to pass an *XComArg* to a downstream task, such as::
@task
def f(a: str) -> int:
return len(a)
f(op.output) # "op" is an operator instance.
f(g()) # "g" is a taskflow task.
where the *a* argument of ``f`` should accept a *str* at runtime, but can be
provided with an *XComArg* in the DAG.
In the long run, it is probably a good idea to make *XComArg* a generic that
carries information about the task's return type, and build the entire XCom
mechanism into the type checker. But Python's type system is still limiting
in this regard now, and (using the above example) we yet to have a good way
to convert ``f``'s argument list from ``[str]`` to ``[XComArg[str] | str]``.
Perhaps *ParamSpec* will be extended enough one day to accommodate this.
"""
@staticmethod
def _treat_as_any(context: AttributeContext | MethodContext) -> Type:
"""Pretend *XComArg* is actually *typing.Any*."""
return AnyType(TypeOfAny.special_form, line=context.context.line, column=context.context.column)
def get_attribute_hook(self, fullname: str) -> Callable[[AttributeContext], Type] | None:
if fullname not in OUTPUT_PROPERTIES:
return None
return self._treat_as_any
def get_method_hook(self, fullname: str) -> Callable[[MethodContext], Type] | None:
if fullname not in TASK_CALL_FUNCTIONS:
return None
return self._treat_as_any
def plugin(version: str):
return OperatorOutputPlugin
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