airflow decorators 源码

airflow decorators 代码

文件路径：/airflow/www/decorators.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
#
# 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

import functools
import gzip
import logging
from io import BytesIO as IO
from itertools import chain
from typing import Callable, TypeVar, cast

import pendulum
from flask import after_this_request, g, request
from pendulum.parsing.exceptions import ParserError

from airflow.models import Log
from airflow.utils.session import create_session

T = TypeVar("T", bound=Callable)

logger = logging.getLogger(__name__)


def action_logging(f: T) -> T:
    """Decorator to log user actions"""

    @functools.wraps(f)
    def wrapper(*args, **kwargs):
        __tracebackhide__ = True  # Hide from pytest traceback.

        with create_session() as session:
            if g.user.is_anonymous:
                user = 'anonymous'
            else:
                user = g.user.username

            fields_skip_logging = {'csrf_token', '_csrf_token'}
            extra_fields = [
                (k, v)
                for k, v in chain(request.values.items(multi=True), request.view_args.items())
                if k not in fields_skip_logging
            ]

            params = {k: v for k, v in chain(request.values.items(), request.view_args.items())}

            log = Log(
                event=f.__name__,
                task_instance=None,
                owner=user,
                extra=str(extra_fields),
                task_id=params.get('task_id'),
                dag_id=params.get('dag_id'),
            )

            if 'execution_date' in request.values:
                execution_date_value = request.values.get('execution_date')
                try:
                    log.execution_date = pendulum.parse(execution_date_value, strict=False)
                except ParserError:
                    logger.exception(
                        "Failed to parse execution_date from the request: %s", execution_date_value
                    )

            session.add(log)

        return f(*args, **kwargs)

    return cast(T, wrapper)


def gzipped(f: T) -> T:
    """Decorator to make a view compressed"""

    @functools.wraps(f)
    def view_func(*args, **kwargs):
        @after_this_request
        def zipper(response):
            accept_encoding = request.headers.get('Accept-Encoding', '')

            if 'gzip' not in accept_encoding.lower():
                return response

            response.direct_passthrough = False

            if (
                response.status_code < 200
                or response.status_code >= 300
                or 'Content-Encoding' in response.headers
            ):
                return response
            gzip_buffer = IO()
            gzip_file = gzip.GzipFile(mode='wb', fileobj=gzip_buffer)
            gzip_file.write(response.data)
            gzip_file.close()

            response.data = gzip_buffer.getvalue()
            response.headers['Content-Encoding'] = 'gzip'
            response.headers['Vary'] = 'Accept-Encoding'
            response.headers['Content-Length'] = len(response.data)

            return response

        return f(*args, **kwargs)

    return cast(T, view_func)

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