Add ChatAdapter class to utils/chat.py

src/backend/langflow/utils/chat.py

@@ -0,0 +1,23 @@
+from typing import Any, Callable, Optional, Union
+
+from langchain_core.prompts import PromptTemplate as LCPromptTemplate
+from langflow.utils.prompt import GenericPromptTemplate
+from llama_index.prompts import PromptTemplate as LIPromptTemplate
+
+PromptTemplate = Union[LCPromptTemplate, LIPromptTemplate]
+
+
+class ChatAdapter:
+    def __init__(self, func: Callable, inputs: list[str], output_key: str, prompt: Optional[PromptTemplate] = None):
+        self.func = func
+        self.input_keys = inputs
+        self.output_keys = output_key
+        self.prompt = prompt
+
+    @classmethod
+    def from_prompt_template(cls, prompt_template: PromptTemplate, func: Callable):
+        prompt = GenericPromptTemplate(prompt_template)
+        return cls(func, prompt.input_keys, prompt_template)
+
+    def __call__(self, inputs: dict, callbacks: Optional[Any] = None) -> dict:
+        return self.func(inputs, callbacks)