Source code for storey.steps.foreach

# Copyright 2020 Iguazio
#
# Licensed 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
#
# 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 storey.flow import _UnaryFunctionFlow


class ForEach(_UnaryFunctionFlow):
    """Applies given function on each event in the stream, passes original event downstream."""

    async def _do_internal(self, element, fn_result):
        self._user_fn_output_to_event(element, fn_result)
        await self._do_downstream(element)