simplify postgres and sqlite database initialization, remove psqlinit.sh (#331 )

Before this change, uninitialized databases would be initialized with the old
schema and then migrated to the latest version. After this change, unintialized
databases are initizialized with the latest database schema immediately, without
having to run any of the migrations. This change has no effect on existing
databases.

Before this change, Postgres database initialization was done manually using
utils/psqlinit.sh. This is inconsistent with SQLite, which the bot initializes
itself. It also requires shell access to the server running the Postgres
instance, which means it cannot be used on managed Postgres instances. After
this change, the bot initializes Postgres databases as it does with SQLite, and
utils/psqlinit.sh has been removed as it is now unecessary.

2022-11-26 15:31:00 -06:00

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PostgreSQL

Here are some instructions for setting up PostgreSQL for use with esmBot.

1. Install PostgreSQL.

=== "Debian/Ubuntu" sh sudo apt-get install postgresql postgresql-client === "Fedora/RHEL" sh sudo dnf install postgresql postgresql-server === "Alpine" sh doas apk add postgresql === "Arch/Manjaro" sh sudo pacman -S postgresql

2. (Optional) Tune PostgreSQL.

PGTune is a useful tool for generating configuration files for your PostgreSQL database. It is highly recommended that you generate a config using this tool as it can increase stability and performance.

3. Create the bot user and database.

When you install PostgreSQL, it'll create a new user on your system that acts as the "superuser" of the database. You'll need to run Postgres commands as this user; however, you can run a command as that user without switching to it by using sudo.

First, you'll need to create a user that the bot can interact with as well as the database itself:

sudo su - postgres -c "createuser esmbot"
sudo su - postgres -c "createdb esmbot"

Then, launch the PostgreSQL shell for the next few commands:

sudo -u postgres psql

If you want to give the user a password, you can do so like this:

ALTER USER esmbot WITH PASSWORD 'new_password';

Once you're inside the shell, you'll need to make sure the bot owns the database and has permissions:

ALTER DATABASE esmbot OWNER TO esmbot;

You're done!

Troubleshooting

If you get an error like error: permission denied for table counts when attempting to run the bot, try running these commands in the PostgreSQL shell:

\c esmbot
GRANT ALL PRIVILEGES ON guilds TO esmbot;
GRANT ALL PRIVILEGES ON counts TO esmbot;
GRANT ALL PRIVILEGES ON tags TO esmbot;
\q

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