src/backend/base/langflow/graph/graph/constants.py

from langflow.graph.schema import CHAT_COMPONENTS
from langflow.utils.lazy_load import LazyLoadDictBase


class Finish:
    def __bool__(self) -> bool:
        return True

    def __eq__(self, /, other):
        return isinstance(other, Finish)


def _import_vertex_types():
    from langflow.graph.vertex import types

    return types


class VertexTypesDict(LazyLoadDictBase):
    def __init__(self) -> None:
        self._all_types_dict = None
        self._types = _import_vertex_types

    @property
    def vertex_type_map(self):
        return self.all_types_dict

    def _build_dict(self):
        langchain_types_dict = self.get_type_dict()
        return {
            **langchain_types_dict,
            "Custom": ["Custom Tool", "Python Function"],
        }

    def get_type_dict(self):
        types = self._types()
        return {
            "CustomComponent": types.CustomComponentVertex,
            "Component": types.ComponentVertex,
            **dict.fromkeys(CHAT_COMPONENTS, types.InterfaceVertex),
        }

    def get_custom_component_vertex_type(self):
        return self._types().CustomComponentVertex


lazy_load_vertex_dict = VertexTypesDict()