| # 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. |
| |
| import logging |
| from collections.abc import Iterator |
| from datetime import datetime, timedelta |
| |
| from croniter import croniter |
| from pytz import timezone as pytz_timezone, UnknownTimeZoneError |
| |
| from superset import app |
| |
| logger = logging.getLogger(__name__) |
| |
| |
| def cron_schedule_window( |
| triggered_at: datetime, cron: str, timezone: str |
| ) -> Iterator[datetime]: |
| window_size = app.config["ALERT_REPORTS_CRON_WINDOW_SIZE"] |
| try: |
| tz = pytz_timezone(timezone) |
| except UnknownTimeZoneError: |
| # fallback to default timezone |
| tz = pytz_timezone("UTC") |
| logger.warning("Timezone %s was invalid. Falling back to 'UTC'", timezone) |
| utc = pytz_timezone("UTC") |
| # convert the current time to the user's local time for comparison |
| time_now = triggered_at.astimezone(tz) |
| start_at = time_now - timedelta(seconds=window_size / 2) |
| stop_at = time_now + timedelta(seconds=window_size / 2) |
| crons = croniter(cron, start_at) |
| for schedule in crons.all_next(datetime): |
| if schedule >= stop_at: |
| break |
| # convert schedule back to utc |
| yield schedule.astimezone(utc).replace(tzinfo=None) |