Moved backend code into its own subfolder

backend/src/db.rs

@@ -0,0 +1,50 @@
+pub mod devices;
+
+use include_dir::{Dir, include_dir};
+use log::{debug, error};
+use rusqlite::Connection;
+use rusqlite_migration::Migrations;
+use std::result::Result;
+use std::sync::LazyLock;
+
+use crate::settings;
+
+static MIGRATIONS_DIR: Dir = include_dir!("$CARGO_MANIFEST_DIR/database_migrations");
+
+// Define migrations. These are applied atomically.
+static MIGRATIONS: LazyLock<Migrations<'static>> =
+    LazyLock::new(|| Migrations::from_directory(&MIGRATIONS_DIR).unwrap());
+
+pub fn init_db() -> Result<Connection, String> {
+    if settings::CONFIG.database.path.is_empty() {
+        error!("Database path not set. Make sure to define database.path in your config file.");
+        Err(format!(
+            "Database path not set. Make sure to define database.path in your config file."
+        ))
+    } else {
+        debug!("Opening database at {}.", settings::CONFIG.database.path);
+
+        let database_path = settings::CONFIG.database.path.clone();
+
+        let mut conn = match Connection::open(database_path) {
+            Ok(value) => value,
+            Err(error) => {
+                error!("Error opening database (oott.db): {error}");
+                return Err(format!("Error opening database (oott.db): {error}"));
+            }
+        };
+
+        debug!("Database open, executing migrations if needed.");
+        // Update the database schema, atomically
+        match MIGRATIONS.to_latest(&mut conn) {
+            Ok(_) => {
+                debug!("Database up to date.");
+                Ok(conn)
+            }
+            Err(error) => {
+                error!("Error updating database: {error}");
+                Err(format!("Error updating database: {error}"))
+            }
+        }
+    }
+}