app.py

# You can find this code for Chainlit python streaming here (https://docs.chainlit.io/concepts/streaming/python)

# OpenAI Chat completion
import os
from openai import AsyncOpenAI  # importing openai for API usage
import chainlit as cl  # importing chainlit for our app
from chainlit.prompt import Prompt, PromptMessage  # importing prompt tools
from chainlit.playground.providers import ChatOpenAI  # importing ChatOpenAI tools
from dotenv import load_dotenv
from src.retrieval_lib import initialize_index, load_pdf_to_text, split_text, load_text_to_index, query_index, create_answer_prompt, generate_answer
from uuid import uuid4

load_dotenv()

os.environ["LANGCHAIN_TRACING_V2"] = "true"
os.environ["LANGCHAIN_PROJECT"] = f"fcb2b - {uuid4().hex[0:8]}"

retriever = initialize_index()

@cl.on_chat_start  # marks a function that will be executed at the start of a user session
async def start_chat():
    settings = {
        "model": "gpt-3.5-turbo",
        "temperature": 0,
        "max_tokens": 500,
        "top_p": 1,
        "frequency_penalty": 0,
        "presence_penalty": 0,
    }
    cl.user_session.set("settings", settings)


@cl.on_message  # marks a function that should be run each time the chatbot receives a message from a user
async def main(message: cl.Message):
    settings = cl.user_session.get("settings")

    client = AsyncOpenAI()

    print(message.content)

    query = message.content
    retrieved_docs = query_index(retriever, query)
    print("retrieved_docs: \n", len(retrieved_docs))
    answer_prompt = create_answer_prompt()
    print("answer_prompt: \n", answer_prompt)
    result = generate_answer(retriever, answer_prompt, query)
    print("result: \n", result["response"].content)

    msg = cl.Message(content="")

    msg.content = result["response"].content

    # Send and close the message stream
    await msg.send()