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Elixir implementation of a LangChain style framework that lets Elixir projects integrate with and leverage LLMs.
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lib/chat_models/chat_model.ex
defmodule LangChain.ChatModels.ChatModel do
require Logger
alias LangChain.Message
alias LangChain.MessageDelta
alias LangChain.Function
alias LangChain.LangChainError
alias LangChain.Utils
@type call_response ::
{:ok, Message.t() | [Message.t()] | [MessageDelta.t()]} | {:error, LangChainError.t()}
@type tool :: Function.t()
@type tools :: [tool()]
@type t :: Ecto.Schema.t()
@callback call(
t(),
String.t() | [Message.t()],
[LangChain.Function.t()]
) :: call_response()
@callback retry_on_fallback?(LangChainError.t()) :: boolean()
@callback serialize_config(t()) :: %{String.t() => any()}
@callback restore_from_map(%{String.t() => any()}) :: {:ok, struct()} | {:error, String.t()}
@doc """
Create a serializable map from a ChatModel's current configuration that can
later be restored.
"""
def serialize_config(%chat_module{} = model) do
# plucks the module from the struct and, because of the behaviour, assumes
# the module defines a `serialize_config/1` function that is executed.
chat_module.serialize_config(model)
end
@doc """
Restore a ChatModel from a serialized config map.
"""
@spec restore_from_map(nil | %{String.t() => any()}) :: {:ok, struct()} | {:error, String.t()}
def restore_from_map(nil), do: {:error, "No data to restore"}
def restore_from_map(%{"module" => module_name} = data) do
case Utils.module_from_name(module_name) do
{:ok, module} ->
module.restore_from_map(data)
{:error, _reason} = error ->
error
end
end
end