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

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from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler
from tfw.networking.event_handlers.server_connector import ServerUplinkConnector
2018-02-13 16:56:01 +00:00
from tfw.components.decorators import RateLimiter
from tfw.config.logs import logging
log = logging.getLogger(__name__)
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.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()
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
@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)
key = 'webide'
self.uplink.send(key, {'data': {'command': 'reload'}})