baseimage-tutorial-framework/lib/tfw/components/directory_monitor.py

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# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
# All Rights Reserved. See LICENSE file for details.
from functools import wraps
from watchdog.events import FileSystemEventHandler as FileSystemWatchdogEventHandler
from tfw.networking import Scope
from tfw.event_handlers import TFWServerUplinkConnector
from tfw.decorators.rate_limiter import RateLimiter
from tfw.mixins.observer_mixin import ObserverMixin
from tfw.config.logs import logging
LOG = logging.getLogger(__name__)
class DirectoryMonitor(ObserverMixin):
def __init__(self, ide_key, directories):
self.eventhandler = IdeReloadWatchdogEventHandler(ide_key)
for directory in directories:
self.observer.schedule(self.eventhandler, directory, recursive=True)
self.pause, self.resume = self.eventhandler.pause, self.eventhandler.resume
@property
def ignore(self):
return self.eventhandler.ignore
@ignore.setter
def ignore(self, value):
self.eventhandler.ignore = value if value >= 0 else 0
@property
def pauser(self):
return DirectoryMonitor.Pauser(self)
class Pauser:
def __init__(self, directory_monitor):
self.directorymonitor = directory_monitor
def __enter__(self):
self.directorymonitor.pause()
def __exit__(self, exc_type, exc_val, exc_tb):
self.directorymonitor.resume()
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class IdeReloadWatchdogEventHandler(FileSystemWatchdogEventHandler):
def __init__(self, ide_key):
super().__init__()
self.ide_key = ide_key
self.uplink = TFWServerUplinkConnector()
self._paused = False
self.ignore = 0
def pause(self):
self._paused = True
def resume(self):
self._paused = False
@RateLimiter(rate_per_second=2)
def on_modified(self, event):
if self._paused:
return
if self.ignore > 0:
self.ignore = self.ignore - 1
return
LOG.debug(event)
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self.uplink.send_message({
'key': self.ide_key,
'data': {'command': 'reload'}
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}, Scope.WEBSOCKET)
def with_monitor_paused(fun):
@wraps(fun)
def wrapper(self, *args, **kwargs):
if self.monitor:
with self.monitor.pauser:
return fun(self, *args, **kwargs)
return fun(self, *args, **kwargs)
return wrapper