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import time
from defence360agent.contracts import config
from defence360agent.contracts.messages import MessageType
from defence360agent.contracts.plugins import (
MessageSink,
MessageSource,
expect,
)
from defence360agent.utils import recurring_check, Scope
POLLING_INTERVAL = config.int_from_envvar("READ_CONFIG_POLLING_INTERVAL", 30)
class ConfigWatcher(MessageSink, MessageSource):
"""Send ConfigUpdate message on [root's] config update.
The config update is detected by polling config file's
modification time.
"""
SCOPE = Scope.AV
def __init__(self):
self._config = config.ConfigFile()
self._last_notify_time = 0
self._sink = None
self._task = None
async def create_sink(self, loop):
"plugins.MessageSink method"
@expect(MessageType.ConfigUpdate)
async def on_config_update_message(self, message):
# update the time, to avoid sending duplicate ConfigUpdate
# messages after the "config update" command
self._last_notify_time = message["timestamp"]
async def create_source(self, loop, sink):
self._sink = sink
self._task = loop.create_task(self._check_config())
async def shutdown(self):
if self._task is not None:
t, self._task = self._task, None
t.cancel()
await t
self._sink = None
@recurring_check(POLLING_INTERVAL)
async def _check_config(self):
if config.any_layer_modified_since(self._last_notify_time):
# notify about the update
message = MessageType.ConfigUpdate(
conf=self._config, timestamp=time.time()
)
await self._sink.process_message(message)
# update the time here, in case ConfigUpdate might stuck
# in the queue for longer than the polling interval
self._last_notify_time = message["timestamp"]