denisstasyev / messenger-backend

TechnoTrack FullStack development course by Mail.Ru (Backend)

messenger-backend

This repository is only for Backend part of TechnoTrack FullStack development course by Mail.Ru.

Deployment

sudo apt update
sudo apt nginx python3 memcached
sudo apt install git -y
sudo apt install redis-server -y
sudo apt install python3-pip -y
sudo pip3 install virtualenv
sudo systemctl start memcached

git clone https://github.com/denisstasyev/messenger-backend.git
cd messenger-backend/
virtualenv venv
pip3 install -r requirements.txt
source venv/bin/activate

Change user from "denis" to your local user in ./routing_configs/nginx/messenger-backend.conf, change server_name to your (my: stasyev.chikenkiller.com)

sudo cp ./routing_configs/nginx/stasyev.chickenkiller.com /etc/nginx/sites-available
sudo ln -s /etc/nginx/sites-available/stasyev.chickenkiller.com /etc/nginx/sites-enabled
sudo rm /etc/nginx/sites-enabled/default
sudo systemctl restart nginx

mkdir instance
touch ./instance/production.cfg

flask db upgrade

In production.cfg add SQLALCHEMY_DATABASE_URI (better to use Postgresql), MAIL_PASSWORD and SECRET_KEY. Finally change in app/_init_.py line to:

app.config.from_pyfile("production.cfg", silent=True)

HTTPS via Certbot

sudo apt-get update
sudo apt-get install software-properties-common
sudo add-apt-repository universe
sudo add-apt-repository ppa:certbot/certbot
sudo apt-get update
sudo apt-get install certbot python-certbot-nginx -y

sudo certbot --nginx
sudo certbot renew --dry-run

Run

Run this project with commands:

cd messenger-backend/
source venv/bin/activate
gunicorn -c routing_configs/gunicorn/gunicorn.conf.py run:app

Some basics

Setup

To setup this project:

1. setup nginx in folder /configs;
2. create database:

sudo apt install postgresql
sudo -u postgres psql
    CREATE USER denis WITH ENCRYPTED PASSWORD 'your_password';
    CREATE DATABASE "messenger" OWNER denis;
    GRANT ALL PRIVILEGES ON DATABASE "messenger" TO denis;

3. setup database via migrations.

Database migrations

flask db init
flask db migrate -m "000_some_text"
flask db upgrade

In case of any migration problems:

DROP TABLE alembic_version;

Open database from Terminal

psql messenger-backend-development
SELECT * FROM users;

Flask-Manager + Flask-Migrate

You can use any migration commant via db postfix, for example:

python3 run.py db upgrade

Celery

Celery creates queue of asynchronous tasks. To enable asynchronous tasks run command below at the same time with Gunicorn command above:

celery -A app.celery worker --loglevel=INFO

For scheduled tasks run also Celery Beat:

celery -A app.celery beat --loglevel=INFO

To manage celery use Flower:

flower -A app.celery --port=5555

Memcached

sudo apt install memcached
sudo systemctl start memcached