app.py

# ------------------------------------------------------------------------------------
# A simple recipe extractor chatbot that extracts recipes from URLs using the OpenAI API.
# To run it, you'll need an OpenAI API key.
# To get one, follow the instructions at https://platform.openai.com/docs/quickstart
# ------------------------------------------------------------------------------------
import os

from openai import AsyncOpenAI
from utils import recipe_prompt, scrape_page_with_url

from shiny.express import ui

# Provide your API key here (or set the environment variable)
llm = AsyncOpenAI(api_key=os.environ.get("OPENAI_API_KEY"))

# Set some Shiny page options
ui.page_opts(
    title="Recipe Extractor Chat",
    fillable=True,
    fillable_mobile=True,
)

# Initialize the chat (with a system prompt and starting message)
chat = ui.Chat(
    id="chat",
    messages=[
        {"role": "system", "content": recipe_prompt},
        {
            "role": "assistant",
            "content": "Hello! I'm a recipe extractor. Please enter a URL to a recipe page. For example, <https://www.thechunkychef.com/epic-dry-rubbed-baked-chicken-wings/>",
        },
    ],
)

chat.ui(placeholder="Enter a recipe URL...")


# A function to transform user input
# Note that, if an exception occurs, the function will return a message to the user
# "short-circuiting" the conversation and asking the user to try again.
@chat.transform_user_input
async def try_scrape_page(input: str) -> str | None:
    try:
        return await scrape_page_with_url(input)
    except Exception:
        await chat.append_message(
            "I'm sorry, I couldn't extract content from that URL. Please try again. "
        )
        return None


@chat.on_user_submit
async def _():
    response = await llm.chat.completions.create(
        model="gpt-4o",
        messages=chat.messages(format="openai"),
        temperature=0,
        stream=True,
    )
    await chat.append_message_stream(response)


app = App(app_ui, server)