Include history to improve query if required.

common/langchain/EveAIHistoryRetriever.py

@@ -0,0 +1,44 @@
+from langchain_core.retrievers import BaseRetriever
+from sqlalchemy import asc
+from sqlalchemy.exc import SQLAlchemyError
+from pydantic import BaseModel, Field
+from typing import Any, Dict
+from flask import current_app
+
+from common.extensions import db
+from common.models.interaction import ChatSession, Interaction
+from common.utils.datetime_utils import get_date_in_timezone
+
+
+class EveAIHistoryRetriever(BaseRetriever):
+    model_variables: Dict[str, Any] = Field(...)
+    session_id: str = Field(...)
+
+    def __init__(self, model_variables: Dict[str, Any], session_id: str):
+        super().__init__()
+        self.model_variables = model_variables
+        self.session_id = session_id
+
+    def _get_relevant_documents(self, query: str):
+        current_app.logger.debug(f'Retrieving history of interactions for query: {query}')
+
+        try:
+            query_obj = (
+                db.session.query(Interaction)
+                .join(ChatSession, Interaction.chat_session_id == ChatSession.id)
+                .filter(ChatSession.session_id == self.session_id)
+                .order_by(asc(Interaction.id))
+            )
+
+            interactions = query_obj.all()
+
+            result = []
+            for interaction in interactions:
+                result.append(f'HUMAN:\n{interaction.detailed_question}\n\nAI: \n{interaction.answer}\n\n')
+
+        except SQLAlchemyError as e:
+            current_app.logger.error(f'Error retrieving history of interactions: {e}')
+            db.session.rollback()
+            return []
+
+        return result