Error: RuntimeError: The session is unavailable because no secret key was set. Set the secret

I'm trying to deploy my flask application on Ubuntu 20.04 using Nginx and Gunicorn. It's been working smoothly when I run FLASK_APP=run.py and then gunicorn -w 9 run=app. However when I setup the configuration files for gunicorn and a config.py I was only able to access the home page but every other route results in an Internal Sever Error. I set my log file to /var/log/app_name/app_name.err.log. The error reported in the logs is raise RuntimeError( RuntimeError: The session is unavailable because no secret key was set. Set the secret_key on the application to something unique and secret. .

Here is a copy of my config.py which is inside my application module where routes.py,models.py and forms.py are.

import os
import json

with open('/etc/scheye_config.json') as config_file:
config = json.load(config_file)


class Config:
   SECRET_KEY = config.get('SECRET_KEY')
   SQL_ALCHEMY_DATABASE_URI = config.get('SQL_ALCHEMY_DATABASE_URI')
   MAIL_SERVER = config.get('MAIL_SERVER')
   MAIL_PORT = 587
   MAIL_USE_TLS = True
   MAIL_USERNAME = config.get('EMAIL_USER')
   MAIL_PASSWORD = config.get('APPLICATION_PASS')

As you can see I'm importing the settings from my json.config file whose code is shown below. The location for the json file is /etc/app_name.json.

{

"SECRET_KEY": "mysecretkey",
"SQLALCHEMY_DATABASE_URI": "database_uri",
"EMAIL_USER": "[email protected]",
"APPLICATION_PASS": "application_password",
"MAIL_SERVER": "smtp.servermail.com"
 }

In my init.py also has almost the same configurations only that I use environment variables. Here's a copy of the init.py.

import os
from flask import Flask
from sqlalchemy.orm import backref
from flask_sqlalchemy import SQLAlchemy
from flask_bcrypt import Bcrypt
from flask_login import LoginManager, login_manager
from flask_mail import Mail


from sqlalchemy import create_engine

app = Flask(__name__)

app.config['SECRET_KEY'] = os.environ.get('SECRET_KEY')

# configuring the database using SQLAlchemy
ENV = 'dev'
if ENV == 'dev':
   app.debug=True
   app.config['SQLALCHEMY_DATABASE_URI'] = os.environ.get('SQLALCHEMY_DATABASE_URI')
else:
    app.debug=False
    app.config['SQLALCHEMY_DATABASE_URI'] = os.environ.get('SQLALCHEMY_DATABASE_URI')
    app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False

db = SQLAlchemy(app)
bcrypt = Bcrypt(app)
login_manager= LoginManager(app)
login_manager.login_view='login' #
login_manager.login_message_category='info' #styling the message returned
app.config['MAIL_SERVER'] = os.environ.get('MAIL_SERVER')
app.config['MAIL_PORT'] = 587
app.config['MAIL_USE_TLS'] = True
app.config['MAIL_USERNAME']= os.environ.get('EMAIL_USER')
app.config['MAIL_PASSWORD']= os.environ.get('APPLICATION_PASS')

#initializing our extension
mail = Mail(app)

engine = create_engine('database_uri')
connection = engine.raw_connection()
cursor = connection.cursor()

from app_name import routes

I have intentionally set my SQLALCHEMY_DATABASE_URI in order to continue testing the app before creating a production database.

I've gone through Configuration Handling in the flask documentation 2.2x and tried possible solutions but to no success. Being quite new to deployment I fear the answer is quite obvious and the source of the error is in the numerous configuration files. If anyone understands what the issue is I would highly appreciate his/her help.

CodePudding user response：

in init.py you do not use your config module

try loading your base config, after app = Flask(__name__)

app.config.from_object('config.Config')

but if you haven't SECRET_KEY in env vars then SECRET_KEY will None again then remove app.config['SECRET_KEY'] = os.environ.get('SECRET_KEY')

or use it in Config class for SECRET_KEY definition as:

class Config:
    SECRET_KEY = os.environ.get('SECRET_KEY', config.get('SECRET_KEY'))