Remove message history

src/reviewllama/llm.py

@@ -1,13 +1,10 @@
 from dataclasses import dataclass
 from typing import Any
 
-from langchain_community.chat_message_histories import ChatMessageHistory
-from langchain_core.chat_history import BaseChatMessageHistory
 from langchain_core.messages import BaseMessage
 from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
 from langchain_core.runnables import RunnableLambda
 from langchain_core.runnables.base import RunnableSerializable
-from langchain_core.runnables.history import RunnableWithMessageHistory
 from langchain_core.runnables.passthrough import RunnablePassthrough
 from langchain_core.vectorstores import VectorStoreRetriever
 from langchain_ollama import ChatOllama
@@ -19,15 +16,7 @@ from .configs import OllamaConfig
 
 @dataclass(frozen=True)
 class ChatClient:
-    chain: RunnableWithMessageHistory
-    message_history: dict[str, BaseChatMessageHistory]
-
-    def get_last_response_or_none(self, session_id: str = "default"):
-        try:
-            messages = self.message_history[session_id].messages
-            return messages[-1] if messages else None
-        except (KeyError, IndexError):
-            return None
+    chain: RunnableSerializable
 
 
 def create_chat_chain(
@@ -43,7 +32,6 @@ def create_chat_chain(
     prompt = ChatPromptTemplate.from_messages(
         [
             ("system", config.system_prompt),
-            MessagesPlaceholder("history"),
             ("human", "Context\n{context}\n\nQuestion:\n{input}"),
         ]
     )
@@ -61,29 +49,11 @@ def create_chat_chain(
     )
 
 
-def get_session_history(
-    session_id: str, message_history: dict[str, BaseChatMessageHistory]
-) -> BaseChatMessageHistory:
-    """Get or create chat message history for a session."""
-    if session_id not in message_history:
-        message_history[session_id] = ChatMessageHistory()
-    return message_history[session_id]
-
-
 def create_chat_client(config: OllamaConfig):
     base_chain = create_chat_chain(config)
-    message_history = {}
-
-    chain_with_history = RunnableWithMessageHistory(
-        base_chain,
-        lambda session_id: get_session_history(session_id, message_history),
-        input_messages_key="input",
-        history_messages_key="history",
-    )
 
     return ChatClient(
-        chain=chain_with_history,
-        message_history=message_history,
+        chain=base_chain,
     )