manager consider whether ovpn interface is up

o_manager.py

@@ -284,7 +284,7 @@ class OManager:
         # n_down = 2
         weights = []
         for i in self.instances:
-            if i["op"].status != RUNNING:
+            if i["op"].status != RUNNING or (not i["op"].interface_up):
                 i["weight"] = 0
                 weights.append(i["weight"])
                 continue

openvpn.py

@@ -78,6 +78,7 @@ class Openvpn:
             self.loop = loop
         else:
             self.loop = asyncio.get_event_loop()
+        self.interface_up = False
         self.load_cfg(ovpn_config, env_config)
 
     def load_cfg(self, ovpn_config, env_config):
@@ -223,6 +224,7 @@ class Openvpn:
             for task in self.run_task:
                 task.cancel()
             self.run_task = []
+            self.interface_up = False
             if clear_folder:
                 self.clear_folder()
 
@@ -275,8 +277,11 @@ class Openvpn:
         """
         io_count = psutil.net_io_counters(pernic=True)
         if self.interface not in io_count:
+            self.interface_up = False
             logging.debug(f"interface {self.interface} is not ready.")
             return
+
+        self.monitor_interval = True
         io_count = io_count[self.interface]
         open(self.io_stat_fp, "a").write(
             f"{datetime.utcnow().timestamp()},{io_count.bytes_recv},{io_count.bytes_sent}\n")