Check link node

api/s5_pipes.py

@@ -94,6 +94,8 @@ def _set_pipe(name: str, id: str, key: str, key_type: str, value: str, optional:
 def set_pipe_node1(name: str, id: str, node1: str) -> ChangeSet:
     if not is_node(name, node1):
         return ChangeSet()
+    if get_pipe_node2(name, id) == node1:
+        return ChangeSet()
 
     return _set_pipe(name, id, 'node1', 'str', str(node1))
 
@@ -101,6 +103,8 @@ def set_pipe_node1(name: str, id: str, node1: str) -> ChangeSet:
 def set_pipe_node2(name: str, id: str, node2: str) -> ChangeSet:
     if not is_node(name, node2):
         return ChangeSet()
+    if get_pipe_node1(name, id) == node2:
+        return ChangeSet()
 
     return _set_pipe(name, id, 'node2', 'str', str(node2))