Implement basic rate limiting for webide autoreload magic

lib/tfw/components/directory_monitor.py

@@ -1,3 +1,4 @@
+from time import time
 from watchdog.observers import Observer
 from watchdog.events import FileSystemEventHandler
 
@@ -8,21 +9,32 @@ log = logging.getLogger(__name__)
 
 
 class WebideReloadEventHandler(FileSystemEventHandler):
-    def __init__(self):
+    def __init__(self, rate_per_second):
         super().__init__()
         self.uplink = ServerUplinkConnector()
 
+        self.min_interval = 1 / float(rate_per_second)
+        self.last_call = time()
+
     def on_modified(self, event):
+        if self.limit_rate(): return
+
         log.debug(event)
         anchor = 'anchor_webide'
         self.uplink.send(anchor, {'anchor': anchor,
                                   'data': {'command': 'reload'}})
 
+    def limit_rate(self):   #TODO: pls review me :3
+        since_last_call = time() - self.last_call
+        to_next_call = self.min_interval - since_last_call
+        self.last_call = time()
+        return to_next_call > 0
+
 
 class DirectoryMonitor:
     def __init__(self, directory):
         self.observer = Observer()
-        self.observer.schedule(WebideReloadEventHandler(), directory, recursive=True)
+        self.observer.schedule(WebideReloadEventHandler(rate_per_second=5), directory, recursive=True)
 
     def watch(self):
         self.observer.start()