Stage changes to implement postgres DB as well as initialise its state

migrations/20211105005738_create_subscriptions_table.sql

@@ -0,0 +1,8 @@
+-- Create Subscriptions Table
+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

@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+set -x
+set -eo pipefail
+
+if ! [ -x "$(command -v psql)" ]; then
+	echo >&2 "Error: `psql` is not installed."
+	echo >&2 "Use:"
+	echo >&2 "		sudo apt update && sudo apt install postgresql-client"
+	echo >&2 "to install it."
+	exit 1
+fi
+
+if ! [ -x "$(command -v sqlx)" ]; then
+	echo >&2 "Error: `sqlx` is not installed."
+	echo >&2 "Use:"
+	echo >&2 "		sudo apt install build-essentials pkg-config openssl libssl-dev"
+	echo >&2 "		cargo install --version=0.5.7 sqlx-cli --no-default-features --features postgres"
+	echo >&2 "to install it."
+	exit 1
+fi
+
+DB_USER=${POSTGRES_USER:=postgres}
+DB_PASSWORD="${POSTGRES_PASSWORD:=password}"
+DB_NAME="${POSTGRES_DB:=newsletter}"
+DB_PORT="${POSTGRES_PORT:=5432}"
+
+# Allow to skip Docker installation if Postgres is already running
+if [[ -z "${SKIP_DOCKER}" ]]
+then
+	docker run \
+		--name postgres-db \
+		-e POSTGRES_USER=${DB_USER} \
+		-e POSTGRES_PASSWORD=${DB_PASSWORD} \
+		-e POSTGRES_DB=${DB_NAME} \
+		-p "${DB_PORT}":5432 \
+		-d postgres \
+		postgres -N 1000
+fi
+
+export PGPASSWORD="${DB_PASSWORD}"
+until psql -h "localhost" -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 anad running on port ${DB_PORT} - running migrations."
+
+export DATABASE_URL=postgres://${DB_USER}:${DB_PASSWORD}@localhost:${DB_PORT}/${DB_NAME}
+sqlx database create
+sqlx migrate run
+
+>&2 echo "Postgres has been migrated. Jobs Complete."