Track and stop site connected greenlets on delete

src/util/GreenletManager.py

@@ -0,0 +1,23 @@
+import gevent
+
+
+class GreenletManager:
+    def __init__(self):
+        self.greenlets = set()
+
+    def spawnLater(self, *args, **kwargs):
+        greenlet = gevent.spawn_later(*args, **kwargs)
+        greenlet.link(lambda greenlet: self.greenlets.remove(greenlet))
+        self.greenlets.add(greenlet)
+        return greenlet
+
+    def spawn(self, *args, **kwargs):
+        greenlet = gevent.spawn(*args, **kwargs)
+        greenlet.link(lambda greenlet: self.greenlets.remove(greenlet))
+        self.greenlets.add(greenlet)
+        return greenlet
+
+    def stopGreenlets(self, reason="Stopping greenlets"):
+        num = len(self.greenlets)
+        gevent.killall(list(self.greenlets))
+        return num