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"""
Copyright (c) 2023 Proton AG
This file is part of Proton VPN.
Proton VPN is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Proton VPN is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with ProtonVPN. If not, see <https://www.gnu.org/licenses/>.
"""
from datetime import timedelta
from proton.vpn.core.refresher.scheduler import RunAgain
from proton.vpn.core.session_holder import SessionHolder
from proton.vpn.session import FeatureFlags
from proton.vpn import logging
from proton.session.exceptions import (
ProtonAPINotReachable, ProtonAPINotAvailable,
)
logger = logging.getLogger(__name__)
# pylint: disable=R0801
class FeatureFlagsRefresher:
"""
Service in charge of refreshing VPN client configuration data.
"""
def __init__(self, session_holder: SessionHolder):
self._session_holder = session_holder
@property
def _session(self):
return self._session_holder.session
@property
def initial_refresh_delay(self):
"""Returns the initial delay before the first refresh."""
return self._session.feature_flags.seconds_until_expiration
async def refresh(self) -> RunAgain:
"""Fetches the new features from the REST API."""
try:
feature_flags = await self._session.fetch_feature_flags()
next_refresh_delay = feature_flags.seconds_until_expiration
except (ProtonAPINotReachable, ProtonAPINotAvailable) as error:
logger.warning(f"Feature flag refresh failed: {error}")
next_refresh_delay = FeatureFlags.get_refresh_interval_in_seconds()
except Exception:
logger.error( # noqa: E501 # pylint: disable=line-too-long # nosemgrep: python.lang.best-practice.logging-error-without-handling.logging-error-without-handling
"Feature flag refresh failed unexpectedly."
"Stopping feature flag refresh."
)
raise
logger.info(
f"Next feature flag refresh scheduled in "
f"{timedelta(seconds=next_refresh_delay)}"
)
return RunAgain.after_seconds(next_refresh_delay)
|
