[Update] 修改coco错误提示

coco/connection.py

@@ -37,12 +37,16 @@ class SSHConnection:
         ssh = paramiko.SSHClient()
         ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
         sock = None
+        error = ''
 
         if not system_user.password and not system_user.private_key:
             self.get_system_user_auth(system_user)
 
         if asset.domain:
             sock = self.get_proxy_sock_v2(asset)
+            if not sock:
+                error = 'Connect gateway failed;'
+                logger.error(error)
 
         try:
             try:
@@ -81,9 +85,9 @@ class SSHConnection:
                 system_user.username, asset.ip, asset.port,
                 password_short, key_fingerprint,
             ))
-            return None, None, str(e)
+            return None, None, error + '\n' + str(e)
         except (socket.error, TimeoutError) as e:
-            return None, None, str(e)
+            return None, None, error + '\n' + str(e)
         return ssh, sock, None
 
     def get_transport(self, asset, system_user):

coco/httpd/elfinder/connector.py

@@ -136,6 +136,7 @@ class ElFinderConnector:
             return cmd
         else:
             self.response['error'] = 'No valid command found'
+            return None, None
 
     def run(self, request):
         """ Main entry point for running commands. Attemps to run a command