handle network.interface being None when network is disconnected

gui/qt/network_dialog.py

@@ -50,18 +50,16 @@ class NetworkDialog(QDialog):
             else:
                 status = _("Not connected")
 
-            if interface.is_connected:
+            if network.is_connected():
                 status += "\n" + _("Main server:") + " %s"%(interface.host) 
             else:
                 status += "\n" + _("Disconnected from main server")
                 
-
-            server = interface.server
         else:
             import random
             status = _("Please choose a server.") + "\n" + _("Select 'Cancel' if you are offline.")
-            server = interface.server
 
+        server = network.default_server
         self.servers = network.get_servers()
 
 
@@ -148,7 +146,7 @@ class NetworkDialog(QDialog):
         if not self.config.is_modifiable('proxy'):
             for w in [self.proxy_host, self.proxy_port, self.proxy_mode]: w.setEnabled(False)
 
-        proxy_config = interface.proxy if interface.proxy else { "mode":"none", "host":"localhost", "port":"8080"}
+        proxy_config = network.proxy if network.proxy else { "mode":"none", "host":"localhost", "port":"8080"}
         self.proxy_mode.setCurrentIndex(self.proxy_mode.findText(str(proxy_config.get("mode").upper())))
         self.proxy_host.setText(proxy_config.get("host"))
         self.proxy_port.setText(proxy_config.get("port"))

lib/blockchain.py

@@ -92,7 +92,11 @@ class Blockchain(threading.Thread):
                     print_error("error", i.server)
                     # todo: dismiss that server
 
-            h = self.servers_height.get(self.network.interface.server)
+            if self.network.is_connected():
+                h = self.servers_height.get(self.network.interface.server)
+            else:
+                h = None
+
             if h is not None and h < height - 1:
                 print_error( "Server is lagging", height, h)
                 if self.config.get('auto_cycle'):

lib/network.py

@@ -166,6 +166,11 @@ class Network(threading.Thread):
             return self.interface.is_connected
 
 
+    def wait_until_connected(self):
+        while not self.interface:
+            time.sleep(1)
+        self.interface.connect_event.wait()
+
     def set_proxy(self, proxy):
         self.proxy = proxy
 
@@ -175,7 +180,9 @@ class Network(threading.Thread):
             return
 
         # stop the interface in order to terminate subscriptions
-        self.interface.stop() 
+        if self.interface:
+            self.interface.stop() 
+
         # notify gui
         self.trigger_callback('disconnecting')
         # start interface

lib/wallet.py

@@ -1510,12 +1510,12 @@ class WalletSynchronizer(threading.Thread):
             self.running = True
 
         while self.is_running():
-            interface = self.network.interface
-            if not interface.is_connected:
+            
+            if not self.network.is_connected():
                 print_error("synchronizer: waiting for interface")
-                interface.connect_event.wait()
+                self.network.wait_until_connected()
                 
-            self.run_interface(interface)
+            self.run_interface(self.network.interface)
 
 
     def run_interface(self, interface):