Can't setup a webhook for a telegram bot

问题

I'm trying make a simple telegram bot in Google App Engine.

When I open the console in GAE, and enter the following, the webhook gets set up just fine

curl -F "url=https://example.appspot.com:8443/<token>"  -F "certificate=@certificate.pem" 
      https://api.telegram.org/bot<token>/setWebhook

But when I run this python script in GAE (of course, having deleted the previous webhook), the webhook doesn't get set up. I couldn't figure out what did I do wrong.

import sys
import os
import time
from flask import Flask, request
import telegram

# CONFIG
TOKEN    = '<token>'
HOST     = 'example.appspot.com' # Same FQDN used when generating SSL Cert
PORT     = 8443
CERT     = "certificate.pem"
CERT_KEY = "key.pem"


bot = telegram.Bot(TOKEN)
app = Flask(__name__)


@app.route('/')
def hello():
    return 'Hello World!'


@app.route('/' + TOKEN, methods=['POST','GET'])
def webhook():
    update = telegram.Update.de_json( request.get_json(force = True), bot )
    chat_id = update.message.chat.id
    bot.sendMessage(chat_id = chat_id, text = 'Hello, there')

    return 'OK'


def setwebhook():
    bot.setWebhook(url = "https://%s:%s/%s" % (HOST, PORT, TOKEN), certificate = open(CERT, 'rb'))


if __name__ == '__main__':
    context = (CERT, CERT_KEY)
    setwebhook()
    time.sleep(5)
    app.run(host = '0.0.0.0', port = PORT, ssl_context = context, debug = True)

The app.yaml file is as follows:

runtime: python27
api_version: 1
threadsafe: yes

- url: .*
  script: main.app

libraries:
- name: webapp2
  version: "2.5.2"
- name: ssl
  version: latest

EDIT: I changed the app.yaml file as follows but I still can't set up a webhook. It now gives me "502 bad gateway nginx" error

runtime: python
env: flex
entrypoint: gunicorn -b :8443 main:app
threadsafe: true

runtime_config:
  python_version: 2

回答1:

Your app.yaml indicates a standard GAE environment, where a Flask application is referenced solely through the app variable and its handlers/routes. The if __name__ == '__main__': section may not even execute. From Creating a request handler for your Flask app:

3. Add this line to create an instance of the Flask class and assign it to a variable called app:

   appengine/standard/flask/tutorial/main.py

   app = Flask(__name__)
   

But you're attempting to run it as a standalone script - which only works locally for a flexible GAE environment app. From Hello World code review:

appengine/flexible/hello_world/main.py

...
if __name__ == '__main__':
    # This is used when running locally. Gunicorn is used to run the
    # application on Google App Engine. See entrypoint in app.yaml.
    app.run(host='127.0.0.1', port=8080, debug=True)

If you do want to run it this way you need to reconfigure you app as a flexible environment one.

Potentially of interest: How to tell if a Google App Engine documentation page applies to the standard or the flexible environment

来源：https://stackoverflow.com/questions/49370552/cant-setup-a-webhook-for-a-telegram-bot