fix(database): handle errors in config parsin or database creation

Showing the user a backtrace can be pretty confusing, so just printing
a nice error message makes errors easier to understand for end users.

fixes #121

src/database.rs

@@ -198,6 +198,11 @@ impl Database {
     pub async fn load_or_create(config: &Config) -> Result<Arc<TokioRwLock<Self>>> {
         Self::check_sled_or_sqlite_db(&config)?;
 
+        if !Path::new(&config.database_path).exists() {
+            std::fs::create_dir_all(&config.database_path)
+                .map_err(|_| Error::BadConfig("Database folder doesn't exists and couldn't be created (e.g. due to missing permissions). Please create the database folder yourself."))?;
+        }
+
         let builder = Engine::open(&config)?;
 
         if config.max_request_size < 1024 {

src/main.rs

@@ -199,16 +199,27 @@ async fn main() {
 
     std::env::set_var("RUST_LOG", "warn");
 
-    let config = raw_config
+    let config = match raw_config.extract::<Config>() {
-        .extract::<Config>()
+        Ok(s) => s,
-        .expect("It looks like your config is invalid. Please take a look at the error");
+        Err(e) => {
+            eprintln!("It looks like your config is invalid. The following error occured while parsing it: {}", e);
+            std::process::exit(1);
+        }
+    };
 
     let start = async {
         config.warn_deprecated();
 
-        let db = Database::load_or_create(&config)
+        let db = match Database::load_or_create(&config).await {
-            .await
+            Ok(db) => db,
-            .expect("config is valid");
+            Err(e) => {
+                eprintln!(
+                    "The database couldn't be loaded or created. The following error occured: {}",
+                    e
+                );
+                std::process::exit(1);
+            }
+        };
 
         let rocket = setup_rocket(raw_config, Arc::clone(&db))
             .ignite()