Line Bot が返答してくれない

Question

実現したいこと

リクルートのA3RTのAPIを使い、LineBotでChatbotを作りたいです。 Flaskでローカルサーバーを立ち上げています。

開発環境

google colaboratory
Python3

問題

Lineのトーク画面から入力しても返答してくれない状態です。
LineBotの管理画面の検証を押すと、「ボットサーバーから200以外のHTTPステータスコードが返されました」と表示されます。

エラーメッセージ

* Serving Flask app "__main__" (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: off
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
 * Running on http://14e041c2bd1c.ngrok.io
 * Traffic stats available on http://127.0.0.1:4040
[2020-08-01 14:58:09,481] ERROR in app: Exception on /callback [POST]
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1952, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1821, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python3.6/dist-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1950, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1936, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "<ipython-input-12-42e9e79c3669>", line 20, in callback
    handler.handle(body, signature)
  File "/usr/local/lib/python3.6/dist-packages/linebot/webhook.py", line 260, in handle
    func(event)
  File "<ipython-input-12-42e9e79c3669>", line 29, in handle_message
    line_bot_api.reply_message(event.reply_token, TextSendMessage(text=ai_message))
NameError: name 'line_bot_api' is not defined
127.0.0.1 - - [01/Aug/2020 14:58:09] "POST /callback HTTP/1.1" 500 -

Line_bot.py

from flask import Flask, request, abort
from linebot import LineBotApi, WebhookHandler
from linebot.exceptions import InvalidSignatureError
from linebot.models import MessageEvent, TextMessage, TextSendMessage
import pya3rt
from flask_ngrok import run_with_ngrok

app = Flask(__name__)
run_with_ngrok(app)

linebot_api = LineBotApi('XXXXXXXXX')
handler = WebhookHandler('YYYYYYYYYY')

@app.route("/callback", methods=['POST'])
def callback():
  signature = request.headers["X-Line-Signature"]
  body = request.get_data(as_text=True)

  try:
    handler.handle(body, signature)
  except InvalidSignatureError:
    abort(400)

  return 'OK'

@handler.add(MessageEvent, message=TextMessage)
def handle_message(event):
  ai_message = talk_ai(event.message.text)
  line_bot_api.reply_message(event.reply_token, TextSendMessage(text=ai_message))


def talk_ai(word):
  apikey = "ZZZZZZZZZZZ"
  client = pya3rt.TalkClient(apikey)
  reply_message = client.talk(word)
  return reply_message['results'][0]['reply']
  #print(reply_message['results'][0]['reply'])<------------（１）


if __name__=='__main__':
  app.run()

試したこと１

Line_bot.pyのreturnを消し、printにし、Lineのトーク画面から入力すると返答してくれます。
(Line_bot.pyの（１）部分）

def talk_ai(word):
  apikey = "DZZHjQEgh66SSzPFIkKaIXWb3rU7Ompy"
  client = pya3rt.TalkClient(apikey)
  reply_message = client.talk(word)
  #return reply_message['results'][0]['reply']
  print(reply_message['results'][0]['reply'])

実行結果（「元気ですか？」と入力しました。）

 * Serving Flask app "__main__" (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: off
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
 * Running on http://42acd2e6eea4.ngrok.io
 * Traffic stats available on http://127.0.0.1:4040
[2020-08-05 04:40:09,586] ERROR in app: Exception on /callback [POST]
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1952, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1821, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python3.6/dist-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1950, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1936, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "<ipython-input-3-1cd27c4c45bc>", line 20, in callback
    handler.handle(body, signature)
  File "/usr/local/lib/python3.6/dist-packages/linebot/webhook.py", line 260, in handle
    func(event)
  File "<ipython-input-3-1cd27c4c45bc>", line 29, in handle_message
    line_bot_api.reply_message(event.reply_token, TextSendMessage(text=ai_message))
NameError: name 'line_bot_api' is not defined
127.0.0.1 - - [05/Aug/2020 04:40:09] "POST /callback HTTP/1.1" 500 -
あなたはどうですか?

試したこと２

A3RTとFlaskで問題が起こっていないか確認しました。

TalkAPI.py

import pya3rt

def talk_ai(word):
  apikey = "ZZZZZZZZZZZZ"
  client = pya3rt.TalkClient(apikey)
  reply_message = client.talk(word)
  print(reply_message['results'][0]['reply'])

talk_ai("好きな食べ物は？")

実行結果

何でも好きですよ

Flask.py

from flask import Flask
from flask_ngrok import run_with_ngrok

app = Flask(__name__)
run_with_ngrok(app)

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


if __name__=='__main__':
  app.run()

実行結果（http://60bc07bf2a27.ngrok.io/hello　でHello Worldと出力されていました。）

 Serving Flask app "__main__" (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: off
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
 * Running on http://60bc07bf2a27.ngrok.io
 * Traffic stats available on http://127.0.0.1:4040
127.0.0.1 - - [01/Aug/2020 12:17:04] "GET / HTTP/1.1" 404 -
127.0.0.1 - - [01/Aug/2020 12:17:04] "GET /favicon.ico HTTP/1.1" 404 -
127.0.0.1 - - [01/Aug/2020 12:17:43] "GET /hello HTTP/1.1" 200 -

pip

!pip install pya3rt
!pip install line-bot-sdk
!pip install flask-ngrok

Answer 1

NameError: name 'line_bot_api' is not defined

エラーメッセージの通り、line_bot_apiという変数が見つからないことが原因ですね。

linebot_api = LineBotApi('XXXXXXXXX')

ここで変数名をlinebot_api にしているのに、

line_bot_api.reply_message(event.reply_token, TextSendMessage(text=ai_message))

ここで、line_bot_api で使おうとしているのが原因だと思います。

ちなみにですが、エラーが出た時に、コードを変更して問題を確認する前にちゃんとエラー内容を確認した方が良いと思います。

まあ、シンプルな間違いでも自分で書いてるとなぜか気づけないということはよくありますが、、、

Comments

[Ling]

かなり初歩的な事でした。どうも難しく考えすぎて頭が凝り固まっていたようです。本当にありがとうございました。