feat(devops): database init and 1st migration

migrations/20240424184922_create_subscriptions_table.sql

@@ -0,0 +1,8 @@
+-- Add migration script here
+CREATE TABLE subscriptions(
+  id uuid NOT NULL,
+  PRIMARY KEY (id),
+  email TEXT NOT NULL UNIQUE,
+  name TEXT NOT NULL,
+  subscribed_at timestamptz NOT NULL
+);

scripts/init_db.sh

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+#!/usr/bin/env bash
+
+set -x
+set -eo pipefail
+
+# check for sqlx and psql first
+if ! [ -x "$(command -v psql)" ]; then
+  echo >&2 "Error: psql is not installed."
+  exit 1
+fi
+
+if ! [ -x "$(command -v sqlx)" ]; then
+  echo >&2 "Error: sqlx is not installed."
+  echo >&2 "Use:"
+  echo >&2 "    cargo install --version='~0.7' sqlx-cli \
+    --no-default-features --features rustls,postgres"
+  echo >&2 "to install it."
+  exit 1
+fi
+
+# Check if a custom user has been set, otherwise default to 'postgres'
+DB_USER="${POSTGRES_USER:=postgres}"
+
+# Check if a custom password has been set, otherwise default to 'password'
+DB_PASSWORD="${POSTGRES_PASSWORD:=password}"
+
+# Check if a custom database name has been set, otherwise default to 'newsletter'
+DB_NAME="${POSTGRES_DB:=newsletter}"
+
+# Check if a custom port has been set, otherwise default to '5432'
+DB_PORT="${POSTGRES_PORT:=5432}"
+
+# Check if a custom host has been set, otherwise default to 'localhost'
+DB_HOST="${POSTGRES_HOST:=localhost}"
+
+# Launch postgres using Docker
+# Allow to skip Docker if a dockerized Postgres database is already running
+if [[ -z "${SKIP_DOCKER}" ]]
+then
+  docker run \
+    -e POSTGRES_USER=${DB_USER} \
+    -e POSTGRES_PASSWORD=${DB_PASSWORD} \
+    -e POSTGRES_DB=${DB_NAME} \
+    -p "${DB_PORT}":5432 \
+    -d postgres \
+    postgres -N 1000
+    # ^ Increased maximum number of connections for testing purposes
+fi
+
+# Keep pinging Postgres until it's ready to accept commands
+export PGPASSWORD="${DB_PASSWORD}"
+
+until psql -h "${DB_HOST}" -U "${DB_USER}" -p "${DB_PORT}" -d "postgres" -c '\q'; do
+  >&2 echo "Postgres is still unavailable - sleeping"
+  sleep 1
+done
+
+>&2 echo "Postgres is up and running on port ${DB_PORT}!"
+
+DATABASE_URL=postgres://${DB_USER}:${DB_PASSWORD}@${DB_HOST}:${DB_PORT}/${DB_NAME}
+
+export DATABASE_URL
+
+sqlx database create
+
+sqlx migrate run
+>&2 echo "Postgres has been migrated, ready to go!"