airflow parameters 源码

airflow parameters 代码

文件路径：/airflow/api_connexion/parameters.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

from datetime import datetime
from functools import wraps
from typing import Any, Callable, Container, TypeVar, cast

from pendulum.parsing import ParserError
from sqlalchemy import text
from sqlalchemy.orm.query import Query

from airflow.api_connexion.exceptions import BadRequest
from airflow.configuration import conf
from airflow.utils import timezone


def validate_istimezone(value: datetime) -> None:
    """Validates that a datetime is not naive"""
    if not value.tzinfo:
        raise BadRequest("Invalid datetime format", detail="Naive datetime is disallowed")


def format_datetime(value: str) -> datetime:
    """
    Datetime format parser for args since connexion doesn't parse datetimes
    https://github.com/zalando/connexion/issues/476

    This should only be used within connection views because it raises 400
    """
    value = value.strip()
    if value[-1] != 'Z':
        value = value.replace(" ", '+')
    try:
        return timezone.parse(value)
    except (ParserError, TypeError) as err:
        raise BadRequest("Incorrect datetime argument", detail=str(err))


def check_limit(value: int) -> int:
    """
    This checks the limit passed to view and raises BadRequest if
    limit exceed user configured value
    """
    max_val = conf.getint("api", "maximum_page_limit")  # user configured max page limit
    fallback = conf.getint("api", "fallback_page_limit")

    if value > max_val:
        return max_val
    if value == 0:
        return fallback
    if value < 0:
        raise BadRequest("Page limit must be a positive integer")
    return value


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


def format_parameters(params_formatters: dict[str, Callable[[Any], Any]]) -> Callable[[T], T]:
    """
    Decorator factory that create decorator that convert parameters using given formatters.

    Using it allows you to separate parameter formatting from endpoint logic.

    :param params_formatters: Map of key name and formatter function
    """

    def format_parameters_decorator(func: T) -> T:
        @wraps(func)
        def wrapped_function(*args, **kwargs):
            for key, formatter in params_formatters.items():
                if key in kwargs:
                    kwargs[key] = formatter(kwargs[key])
            return func(*args, **kwargs)

        return cast(T, wrapped_function)

    return format_parameters_decorator


def apply_sorting(
    query: Query,
    order_by: str,
    to_replace: dict[str, str] | None = None,
    allowed_attrs: Container[str] | None = None,
) -> Query:
    """Apply sorting to query"""
    lstriped_orderby = order_by.lstrip('-')
    if allowed_attrs and lstriped_orderby not in allowed_attrs:
        raise BadRequest(
            detail=f"Ordering with '{lstriped_orderby}' is disallowed or "
            f"the attribute does not exist on the model"
        )
    if to_replace:
        lstriped_orderby = to_replace.get(lstriped_orderby, lstriped_orderby)
    if order_by[0] == "-":
        order_by = f"{lstriped_orderby} desc"
    else:
        order_by = f"{lstriped_orderby} asc"
    return query.order_by(text(order_by))

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