Sresht / lect11-starter

Set up React

0. cd ~/environment && git clone https://github.com/Sresht/lect11-starter/ && cd lect11-starter
1. Install your stuff!
   a) npm install
   b) pip install flask-socketio
   c) pip install eventlet
   d) npm install -g webpack
   e) npm install --save-dev webpack
   f) npm install socket.io-client --save
   ⚠️ ⚠️ ⚠️ If you see any error messages, make sure you use sudo pip or sudo npm. If it says "pip cannot be found", run which pip and use sudo [path to pip from which pip] install ⚠️ ⚠️ ⚠️
2. If you already have psql set up, SKIP THE REST OF THE STEPS AND JUST DO THE FOLLOWING COMMAND:
   sudo service postgresql start
3. Copy your sql.env file into your new directory.

Getting PSQL to work with Python

1. Update yum: sudo yum update, and enter yes to all prompts
2. Upgrade pip: sudo /usr/local/bin/pip install --upgrade pip
3. Get psycopg2: sudo /usr/local/bin/pip install psycopg2-binary
4. Get SQLAlchemy: sudo /usr/local/bin/pip install Flask-SQLAlchemy==2.1

Setting up PSQL

1. Install PostGreSQL: sudo yum install postgresql postgresql-server postgresql-devel postgresql-contrib postgresql-docs
   Enter yes to all prompts.
2. Initialize PSQL database: sudo service postgresql initdb
3. Start PSQL: sudo service postgresql start
4. Make a new superuser: sudo -u postgres createuser --superuser $USER
   ⚠️ ⚠️ ⚠️ If you get an error saying "could not change directory", that's okay! It worked! ⚠️ ⚠️ ⚠️
5. Make a new database: sudo -u postgres createdb $USER
   ⚠️ ⚠️ ⚠️ If you get an error saying "could not change directory", that's okay! It worked! ⚠️ ⚠️ ⚠️
6. Make sure your user shows up:
   a) psql
   b) \du look for ec2-user as a user
   c) \l look for ec2-user as a database
7. Make a new user:
   a) psql (if you already quit out of psql)

   REPLACE THE [VALUES] IN THIS COMMAND! Type this with a new (short) unique password.

   b) I recommend 4-5 characters - it doesn't have to be very secure. Remember this password!
   create user [some_username_here] superuser password '[some_unique_new_password_here]';
   c) \q to quit out of sql
8. cd into lect11 and make a new file called sql.env and add SQL_USER= and SQL_PASSWORD= in it
9. Fill in those values with the values you put in 7. b)

Enabling read/write from SQLAlchemy

There's a special file that you need to enable your db admin password to work for:

1. Open the file in vim: sudo vim /var/lib/pgsql9/data/pg_hba.conf If that doesn't work: sudo vim $(psql -c "show hba_file;" | grep pg_hba.conf)
2. Replace all values of ident with md5 in Vim: :%s/ident/md5/g
3. After changing those lines, run sudo service postgresql restart
4. Ensure that sql.env has the username/password of the superuser you created!
5. Run your code!
   a) npm run watch. If prompted to install webpack-cli, type "yes"
   b) In a new terminal, python app.py
   c) Preview Running Application (might have to clear your cache by doing a hard refresh)