feat: enhance execute method to support mcp_tool_id and mcp_source parameters

--bug=1060726 --user=刘瑞斌 【工具】应用中引用的MCP没删除后，在应用对话界面依然可以调用MCP的工具 https://www.tapd.cn/62980211/s/1759963

Author: liuruibin

apps/application/flow/step_node/mcp_node/i_mcp_node.py

@@ -9,16 +9,12 @@
 
 
 class McpNodeSerializer(serializers.Serializer):
-    mcp_servers = serializers.JSONField(required=True,
-                                        label=_("Mcp servers"))
-
-    mcp_server = serializers.CharField(required=True,
-                                       label=_("Mcp server"))
-
+    mcp_servers = serializers.JSONField(required=True, label=_("Mcp servers"))
+    mcp_server = serializers.CharField(required=True, label=_("Mcp server"))
     mcp_tool = serializers.CharField(required=True, label=_("Mcp tool"))
-
-    tool_params = serializers.DictField(required=True,
-                                        label=_("Tool parameters"))
+    mcp_tool_id = serializers.UUIDField(required=False, label=_("Mcp tool"), allow_null=True)
+    mcp_source = serializers.CharField(required=False, label=_("Mcp source"), allow_blank=True, allow_null=True)
+    tool_params = serializers.DictField(required=True, label=_("Tool parameters"))
 
 
 class IMcpNode(INode):
@@ -30,5 +26,5 @@ def get_node_params_serializer_class(self) -> Type[serializers.Serializer]:
     def _run(self):
         return self.execute(**self.node_params_serializer.data, **self.flow_params_serializer.data)
 
-    def execute(self, mcp_servers, mcp_server, mcp_tool, tool_params, **kwargs) -> NodeResult:
+    def execute(self, mcp_servers, mcp_server, mcp_tool, mcp_tool_id, mcp_source, tool_params, **kwargs) -> NodeResult:
         pass

apps/application/flow/step_node/mcp_node/impl/base_mcp_node.py

@@ -3,10 +3,12 @@
 import json
 from typing import List
 
+from django.db.models import QuerySet
 from langchain_mcp_adapters.client import MultiServerMCPClient
 
 from application.flow.i_step_node import NodeResult
 from application.flow.step_node.mcp_node.i_mcp_node import IMcpNode
+from tools.models import Tool
 
 
 class BaseMcpNode(IMcpNode):
@@ -15,10 +17,20 @@ def save_context(self, details, workflow_manage):
         self.context['tool_params'] = details.get('tool_params')
         self.context['mcp_tool'] = details.get('mcp_tool')
 
-    def execute(self, mcp_servers, mcp_server, mcp_tool, tool_params, **kwargs) -> NodeResult:
-        servers = json.loads(mcp_servers)
-        params = json.loads(json.dumps(tool_params))
-        params = self.handle_variables(params)
+    def execute(self, mcp_servers, mcp_server, mcp_tool, mcp_tool_id, mcp_source, tool_params,**kwargs) -> NodeResult:
+        if mcp_source == 'referencing':
+            if not mcp_tool_id:
+                raise ValueError("MCP tool ID is required when mcp_source is 'referencing'.")
+            tool = QuerySet(Tool).filter(id=mcp_tool_id).first()
+            if not tool:
+                raise ValueError(f"Tool with ID {mcp_tool_id} not found.")
+            servers = json.loads(tool.code)
+            params = json.loads(json.dumps(tool_params))
+            params = self.handle_variables(params)
+        else:
+            servers = json.loads(mcp_servers)
+            params = json.loads(json.dumps(tool_params))
+            params = self.handle_variables(params)
 
         async def call_tool(t, a):
             client = MultiServerMCPClient(servers)