chore: copy db init script from chat app

.vscode/settings.json

@@ -3,6 +3,7 @@
     "bbur",
     "disp",
     "GLHF",
+    "isready",
     "timespan",
     "zeroize"
   ],

scripts/init_db.sh

@@ -0,0 +1,77 @@
+#!/usr/bin/env bash
+# set -x # Only turn on if debugging otherwise it just seems annoying
+set -eo pipefail
+
+if ! [ -x "$(command -v sqlx)" ]; then
+  echo >&2 "Error: sqlx is not installed."
+  echo >&2 "Use:"
+  echo >&2 "    cargo install --version='~0.8' sqlx-cli --no-default-features --features rustls,postgres"
+  echo >&2 "to install it."
+  exit 1
+fi
+
+# Check if a custom parameter has been set, otherwise use default values
+DB_PORT="${DB_PORT:=5432}"
+SUPERUSER="${SUPERUSER:=postgres}"
+SUPERUSER_PWD="${SUPERUSER_PWD:=password}"
+APP_USER="${APP_USER:=db_user}"
+APP_USER_PWD="${APP_USER_PWD:=password}"
+APP_DB_NAME="${APP_DB_NAME:=bazooka_bot}"
+
+# Allow to skip Docker if a Postgres database is already running
+if [[ -z "${SKIP_DOCKER}" ]]
+then
+  # if a postgres container is running, print instructions to kill it and exit
+  RUNNING_POSTGRES_CONTAINER=$(docker ps --filter 'name=postgres' --format '{{.ID}}')
+  if [[ -n $RUNNING_POSTGRES_CONTAINER ]]; then
+    echo >&2 "there is a postgres container already running, kill it with"
+    echo >&2 "    docker kill ${RUNNING_POSTGRES_CONTAINER}"
+    exit 1
+  fi
+  CONTAINER_NAME="postgres_$(date '+%s')"
+  # Launch postgres using Docker
+  echo "Container ID is:"
+  docker run \
+      --env POSTGRES_USER=${SUPERUSER} \
+      --env POSTGRES_PASSWORD=${SUPERUSER_PWD} \
+      --health-cmd="pg_isready -U ${SUPERUSER} || exit 1" \
+      --health-interval=1s \
+      --health-timeout=5s \
+      --health-retries=5 \
+      --publish "${DB_PORT}":5432 \
+      --detach \
+      --name "${CONTAINER_NAME}" \
+      postgres -N 1000
+      # ^ Increased maximum number of connections for testing purposes
+
+  max_retries=120
+  until [ \
+    "$(docker inspect -f "{{.State.Health.Status}}" ${CONTAINER_NAME})" == \
+    "healthy" \
+  ]; do     
+    >&2 echo "Postgres is still unavailable - sleeping ($max_retries attempts left)"
+    if [ $max_retries -lt 1 ];  then
+        >&2 echo "Exceeded attempts to connect to DB"
+        exit 1
+    fi
+    sleep 1
+    ((max_retries--))
+  done
+
+  # Create the application user
+  CREATE_QUERY="CREATE USER ${APP_USER} WITH PASSWORD '${APP_USER_PWD}';"
+  docker exec -it "${CONTAINER_NAME}" psql -U "${SUPERUSER}" -c "${CREATE_QUERY}"
+
+  # Grant create db privileges to the app user
+  GRANT_QUERY="ALTER USER ${APP_USER} CREATEDB;"
+  docker exec -it "${CONTAINER_NAME}" psql -U "${SUPERUSER}" -c "${GRANT_QUERY}"
+fi
+
+>&2 echo "Postgres is up and running on port ${DB_PORT} - running migrations now!"
+
+# Create the application database
+export DATABASE_URL=postgres://${APP_USER}:${APP_USER_PWD}@localhost:${DB_PORT}/${APP_DB_NAME}
+sqlx database create
+sqlx migrate run --source migrations_pg
+
+>&2 echo "Postgres has been migrated, ready to go!"