Merge branch '10-run-diesel-database-migrations-automatically' into 'main'

Run Diesel database migrations automatically

Closes #10

See merge request libretunes/libretunes!4

src/build.rs

@@ -6,4 +6,6 @@ fn main() {
         "cargo:rustc-cfg=target=\"{}\"",
         std::env::var("TARGET").unwrap()
     );
+
+    println!("cargo:rerun-if-changed=migrations");
 }

src/database.rs

@@ -13,6 +13,12 @@ use diesel::{
     r2d2::Pool,
 };
 
+use diesel_migrations::{
+    embed_migrations,
+    EmbeddedMigrations,
+    MigrationHarness,
+};
+
 // See https://leward.eu/notes-on-diesel-a-rust-orm/
 
 // Define some types to make it easier to work with Diesel
@@ -95,5 +101,15 @@ pub fn get_db_conn() -> PgPooledConn {
     DB_POOL.get().expect("Failed to get a database connection from the pool.")
 }
 
+/// Embedded database migrations into the binary
+const DB_MIGRATIONS: EmbeddedMigrations =  embed_migrations!();
+
+/// Run any pending migrations in the database
+/// Always safe to call, as it will only run migrations that have not already been run
+pub fn migrate() {
+    let db_con = &mut get_db_conn();
+    db_con.run_pending_migrations(DB_MIGRATIONS).expect("Could not run database migrations");
+}
+
 }
 }

src/main.rs

@@ -8,6 +8,9 @@ extern crate openssl;
 #[macro_use]
 extern crate diesel;
 
+#[cfg(feature = "ssr")]
+extern crate diesel_migrations;
+
 #[cfg(feature = "ssr")]
 #[actix_web::main]
 async fn main() -> std::io::Result<()> {
@@ -19,6 +22,9 @@ async fn main() -> std::io::Result<()> {
     use dotenv::dotenv;
     dotenv().ok();
 
+    // Bring the database up to date
+    libretunes::database::migrate();
+    
     let session_secret_key = if let Ok(key) = std::env::var("SESSION_SECRET_KEY") {
         Key::from(key.as_bytes())
     } else {