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

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from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler
from os.path import exists, isdir
from tfw.networking.event_handlers.server_connector import ServerUplinkConnector
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from tfw.components.decorators import RateLimiter
from tfw.event_handler_base import TriggerlessEventHandler
from tfw.config.logs import logging
log = logging.getLogger(__name__)
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class WebideReloadEventHandler(FileSystemEventHandler):
def __init__(self):
super().__init__()
self.uplink = ServerUplinkConnector()
self._paused = False
self.ignore = 0
def pause(self):
self._paused = True
def resume(self):
self._paused = False
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@RateLimiter(rate_per_second=5)
def on_modified(self, event):
if self._paused: return
if self.ignore > 0:
self.ignore = self.ignore - 1
return
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log.debug(event)
key = 'webide'
self.uplink.send(key, {'data': {'command': 'reload'}})
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class DirectoryMonitor:
def __init__(self, directory):
self.observer = Observer()
self.eventhandler = WebideReloadEventHandler()
self.observer.schedule(self.eventhandler, directory, recursive=True)
self.pause, self.resume = self.eventhandler.pause, self.eventhandler.resume
def watch(self):
self.observer.start()
def stop(self):
self.observer.stop()
self.observer.join()
@property
def ignore(self):
return self.eventhandler.ignore
@ignore.setter
def ignore(self, value):
self.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()
class DirectoryMonitoringEventHandler(TriggerlessEventHandler):
def __init__(self, key, directory):
super().__init__(key)
self._directory = directory
self._monitor = None
self.reload_monitor()
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self.commands = {'pause': self.pause,
'resume': self.resume,
'ignore': self.ignore,
'selectdir': self.selectdir}
@property
def directory(self):
return self._directory
@directory.setter
def directory(self, directory):
if not exists(directory) or not isdir(directory): raise EnvironmentError('No such directory!')
self._directory = directory
@property
def monitor(self):
return self._monitor
def reload_monitor(self):
if self._monitor:
try: self._monitor.stop()
except KeyError: logging.debug('Working directory was removed ignoring...')
self._monitor = DirectoryMonitor(self._directory)
self._monitor.watch() # This runs on a separate thread
def handle_event(self, key, message):
try:
message['data'] = self.commands[message['data']['command']](message['data'])
return message
except KeyError:
log.error('IGNORING MESSAGE: Invalid message received: {}'.format(message))
def pause(self, data):
self.monitor.pause()
return data
def resume(self, data):
self.monitor.resume()
return data
def ignore(self, data):
self.monitor.ignore += data['ignore']
return data
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def selectdir(self, data):
try:
self.directory = data['directory']
self.reload_monitor()
return data
except EnvironmentError:
log.error('DirManagingEH failed to switch directory!')
def cleanup(self):
self.monitor.stop()