Azure Web App Deployment with Bot Framework: Resolving 'Failed to Find Attribute 'app'' Error

Question

I've deployed a Python codebase with the Bot Framework on Azure Web App, and I'm encountering an error: "Failed to find attribute 'app' in 'app'." The code for starting the application follows the standard Microsoft Code example.

Here's a snippet of the code:

import sys
import traceback
from datetime import datetime
from http import HTTPStatus

from aiohttp import web
from aiohttp.web import Request, Response, json_response
from botbuilder.core import (
    BotFrameworkAdapterSettings,
    TurnContext,
    BotFrameworkAdapter,
)
from botbuilder.core.integration import aiohttp_error_middleware
from botbuilder.schema import Activity, ActivityTypes

from bot import MyBot
from config import DefaultConfig
from openaibot.openaibot import OpenAIBot

CONFIG = DefaultConfig()

# Create adapter.
# See https://aka.ms/about-bot-adapter to learn more about how bots work.
SETTINGS = BotFrameworkAdapterSettings(CONFIG.APP_ID, CONFIG.APP_PASSWORD)
ADAPTER = BotFrameworkAdapter(SETTINGS)


# Catch-all for errors.
async def on_error(context: TurnContext, error: Exception):
    # This check writes out errors to console log .vs. app insights.
    # NOTE: In production environment, you should consider logging this to Azure
    #       application insights.
    print(f"\n [on_turn_error] unhandled error: {error}", file=sys.stderr)
    traceback.print_exc()

    # Send a message to the user
    await context.send_activity("The bot encountered an error or bug.")
    await context.send_activity(
        "To continue to run this bot, please fix the bot source code."
    )
    # Send a trace activity if we're talking to the Bot Framework Emulator
    if context.activity.channel_id == "emulator":
        # Create a trace activity that contains the error object
        trace_activity = Activity(
            label="TurnError",
            name="on_turn_error Trace",
            timestamp=datetime.utcnow(),
            type=ActivityTypes.trace,
            value=f"{error}",
            value_type="https://www.botframework.com/schemas/error",
        )
        # Send a trace activity, which will be displayed in Bot Framework Emulator
        await context.send_activity(trace_activity)


ADAPTER.on_turn_error = on_error

# Create the Bot
#BOT = MyBot()
OAIBOT = OpenAIBot(CONFIG)
BOT = MyBot(OAIBOT)



# Listen for incoming requests on /api/messages
async def messages(req: Request) -> Response:
    # Main bot message handler.
    if "application/json" in req.headers["Content-Type"]:
        body = await req.json()
    else:
        return  Response(status=415) 

    activity = Activity().deserialize(body)
    auth_header = req.headers["Authorization"] if "Authorization" in req.headers else ""

    response = await ADAPTER.process_activity(activity, auth_header, BOT.on_turn)
    if response:
        return json_response(data=response.body, status=response.status)
    return Response(status=201)


#####
APP = web.Application(middlewares=[aiohttp_error_middleware])
APP.router.add_post("/api/messages", messages)

if __name__ == "__main__":
    try:
        web.run_app(APP, host="localhost", port=CONFIG.PORT)
    except Exception as error:
        raise error

The error seems to be related to the web.run_app section. I'm not sure why the 'app' attribute is not found.

Any insights or suggestions on what might be causing this issue? Is there something specific I need to configure differently when deploying to Azure Web App? I'd appreciate any help or guidance on resolving this problem.

Answer 1

Posting my comments as an answer is a benefit for the community.

After successful deployment to the Azure Web app, You should add this in the Startup command > Configuration > General settings > Startup Command > python3 -m aiohttp.web -H 0.0.0.0 -P 8000 app:init_func in the Azure Web app as below.