Database initialization

During startup, an empty data.db is generated if it doesnt exist. This will then be
migrated.

src/error.rs

@@ -40,6 +40,15 @@ impl Error {
     }
 }
 
+impl From<std::io::Error> for Error {
+    fn from(source: std::io::Error) -> Self {
+        Self {
+            code: ErrorCode::Internal,
+            message: source.to_string(),
+        }
+    }
+}
+
 impl From<&str> for Error {
     fn from(s: &str) -> Self {
         Error {

src/main.rs

@@ -1,3 +1,5 @@
+use std::path::Path;
+
 use actix_web::{get, web, App, HttpResponse, HttpServer};
 use rust_embed::RustEmbed;
 use sea_orm::{Database, DatabaseConnection};
@@ -71,6 +73,12 @@ async fn dist(path: web::Path<String>) -> HttpResponse {
 
 #[instrument]
 async fn setup_database() -> error::Result<DatabaseConnection> {
+    let db_fname = "data.db";
+
+    if !Path::new(db_fname).exists() {
+        std::fs::File::create(db_fname)?;
+    }
+
     let pool = sqlx::SqlitePool::connect("sqlite://data.db").await?;
     sqlx::migrate!("./migrations").run(&pool).await?;
     tracing::info!("Database migrated");