fix: set up creators

src/backend/langflow/graph/base.py

@@ -5,9 +5,8 @@
 
 from copy import deepcopy
 import types
-from typing import Any, Dict, List, Optional, Union
-from langflow.utils import payload
-from langflow.interface.listing import ALL_TYPES_DICT, ALL_TOOLS_NAMES, TOOLS_DICT
+from typing import Any, Dict, List
+from langflow.interface.listing import ALL_TYPES_DICT, TOOLS_DICT
 from langflow.interface import loading
 
 

src/backend/langflow/interface/agents/base.py

@@ -26,3 +26,6 @@ class AgentCreator(LangChainTypeCreator):
             for agent in self.type_to_loader_dict.values()
             if agent.__name__ in settings.agents or settings.dev
         ]
+
+
+agent_creator = AgentCreator()

src/backend/langflow/interface/base.py

@@ -1,4 +1,4 @@
-from typing import Dict, List
+from typing import Any, Dict, List, Optional
 from pydantic import BaseModel
 from abc import ABC, abstractmethod
 from langflow.template.template import Template, Field, FrontendNode
@@ -16,23 +16,25 @@ class LangChainTypeCreator(BaseModel, ABC):
         pass
 
     @abstractmethod
-    def get_signature(self, name: str) -> Dict:
+    def get_signature(self, name: str) -> Optional[Dict[Any, Any]]:
         pass
 
     @abstractmethod
     def to_list(self) -> List[str]:
         pass
 
-    def to_dict(self):
-        result = {self.type_name: {}}  # type: Dict
+    def to_dict(self) -> Dict:
+        result: Dict = {self.type_name: {}}
 
         for name in self.to_list():
-            result[self.type_name][name] = self.get_signature(name)
+            result[self.type_name][name] = self.frontend_node(name).to_dict()
 
         return result
 
     def frontend_node(self, name) -> FrontendNode:
         signature = self.get_signature(name)
+        if signature is None:
+            raise ValueError(f"{name} not found")
         fields = [
             Field(
                 name=key,

src/backend/langflow/interface/chains/base.py

@@ -1,7 +1,5 @@
 from typing import Dict, List
 from langflow.interface.base import LangChainTypeCreator
-from langflow.interface.signature import get_chain_signature
-from langflow.template.template import Field, FrontendNode, Template
 from langflow.utils.util import build_template_from_function
 from langflow.settings import settings
 from langchain.chains import loading as chains_loading
@@ -33,3 +31,6 @@ class ChainCreator(LangChainTypeCreator):
                 or settings.dev
             )
         ]
+
+
+chain_creator = ChainCreator()

src/backend/langflow/interface/custom_types.py

@@ -1,5 +1,5 @@
 from typing import Callable, Optional
-from langchain import LLMChain, PromptTemplate
+from langchain import LLMChain
 from langchain.agents import AgentExecutor, ZeroShotAgent
 from langflow.utils import validate
 from pydantic import BaseModel, validator
@@ -64,6 +64,12 @@ class JsonAgent(BaseModel):
             prompt=prompt,
         )
         agent = ZeroShotAgent(llm_chain=llm_chain, allowed_tools=tool_names)
-        return AgentExecutor.from_agent_and_tools(
+        self.agent_executor = AgentExecutor.from_agent_and_tools(
             agent=agent, tools=tools, verbose=True
         )
+
+    def __call__(self, *args, **kwargs):
+        return self.agent_executor(*args, **kwargs)
+
+    def run(self, *args, **kwargs):
+        return self.agent_executor.run(*args, **kwargs)

src/backend/langflow/interface/llms/base.py

@@ -25,3 +25,6 @@ class LLMCreator(LangChainTypeCreator):
             for llm in self.type_to_loader_dict.values()
             if llm.__name__ in settings.llms or settings.dev
         ]
+
+
+llm_creator = LLMCreator()

src/backend/langflow/interface/memories/base.py

@@ -25,3 +25,6 @@ class MemoryCreator(LangChainTypeCreator):
             for memory in self.type_to_loader_dict.values()
             if memory.__name__ in settings.memories or settings.dev
         ]
+
+
+memory_creator = MemoryCreator()

src/backend/langflow/interface/prompts/base.py

@@ -30,3 +30,6 @@ class PromptCreator(LangChainTypeCreator):
             or settings.dev
         ]
         return library_prompts + list(custom_prompts.keys())
+
+
+prompt_creator = PromptCreator()

src/backend/langflow/interface/tools/base.py

@@ -18,7 +18,7 @@ class ToolCreator(LangChainTypeCreator):
 
     @property
     def type_to_loader_dict(self) -> Dict:
-        return ALL_TOOLS_NAMES
+        return util.get_tools_dict()
 
     def get_signature(self, name: str) -> Dict | None:
         """Get the signature of a tool."""
@@ -26,7 +26,7 @@ class ToolCreator(LangChainTypeCreator):
         NODE_INPUTS = ["llm", "func"]
         base_classes = ["Tool"]
         all_tools = {}
-        for tool in ALL_TOOLS_NAMES:
+        for tool in self.type_to_loader_dict.keys():
             if tool_params := util.get_tool_params(util.get_tool_by_name(tool)):
                 tool_name = tool_params.get("name") or str(tool)
                 all_tools[tool_name] = {"type": tool, "params": tool_params}
@@ -126,3 +126,6 @@ class ToolCreator(LangChainTypeCreator):
         # Add Tool
         custom_tools = customs.get_custom_nodes("tools")
         return tools + list(custom_tools.keys())
+
+
+tool_creator = ToolCreator()

src/backend/langflow/interface/types.py

@@ -1,12 +1,9 @@
-from langflow.interface.agents import AgentCreator
-from langflow.interface.listing import list_type
-from langflow.interface.llms import LLMCreator
-from langflow.interface.memories.base import MemoryCreator
-from langflow.interface.prompts import PromptCreator
-from langflow.interface.signature import get_signature
-from langchain import chains
-from langflow.interface.chains import ChainCreator
-from langflow.interface.tools import ToolCreator
+from langflow.interface.agents.base import agent_creator
+from langflow.interface.llms.base import llm_creator
+from langflow.interface.memories.base import memory_creator
+from langflow.interface.prompts.base import prompt_creator
+from langflow.interface.chains.base import chain_creator
+from langflow.interface.tools.base import tool_creator
 
 
 def get_type_list():
@@ -23,12 +20,6 @@ def get_type_list():
 
 def build_langchain_types_dict():
     """Build a dictionary of all langchain types"""
-    chain_creator = ChainCreator()
-    agent_creator = AgentCreator()
-    prompt_creator = PromptCreator()
-    tool_creator = ToolCreator()
-    llm_creator = LLMCreator()
-    memory_creator = MemoryCreator()
 
     all_types = {}