Reworked the database code to make use of the ? operator.

backend/src/api.rs

@@ -123,14 +123,19 @@ impl<'r> FromRequest<'r> for schema::User {
         let id = token.claims.uid;
 
         let conn = req.guard::<DbConn>().await.unwrap();
-        return Outcome::Success(schema::get_user(conn, id).await);
+        return match schema::get_user(conn, id).await {
+            Ok(o) => Outcome::Success(o),
+            Err(_) => Outcome::Forward(())
+        }
     }
 }
 
 #[get("/gamenights")]
 pub async fn gamenights(conn: DbConn, _user: schema::User) -> ApiResponseVariant {
-    let gamenights = schema::get_all_gamenights(conn).await;
+    match schema::get_all_gamenights(conn).await {
-    ApiResponseVariant::Value(json!(ApiResponse::gamenight_response(gamenights)))
+        Ok(gamenights) => ApiResponseVariant::Value(json!(ApiResponse::gamenight_response(gamenights))),
+        Err(error) => ApiResponseVariant::Value(json!(ApiResponse::error(error.to_string())))
+    }
 }
 
 #[get("/gamenights", rank = 2)]

backend/src/schema.rs

@@ -71,6 +71,18 @@ pub enum DatabaseError {
     Query(String),
 }
 
+impl From<diesel::result::Error> for DatabaseError {
+    fn from(error: diesel::result::Error) -> Self { 
+        Self::Query(error.to_string())
+    }
+}
+
+impl From<password_hash::Error> for DatabaseError {
+    fn from(error: password_hash::Error) -> Self {
+        Self::Hash(error)
+    }
+}
+
 impl std::fmt::Display for DatabaseError {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::result::Result<(), std::fmt::Error> {
         match self {
@@ -80,55 +92,44 @@ impl std::fmt::Display for DatabaseError {
     }
 }
 
-pub async fn get_all_gamenights(conn: DbConn) -> Vec<GameNight> {
+pub async fn get_all_gamenights(conn: DbConn) -> Result<Vec<GameNight>, DatabaseError> {
-    conn.run(|c| gamenight::table.load::<GameNight>(c).unwrap())
+    Ok(conn.run(|c| 
-        .await
+        gamenight::table.load::<GameNight>(c)
+    ).await?)
 }
 
-pub async fn insert_gamenight(conn: DbConn, new_gamenight: GameNightNoId) -> Result<(), DatabaseError> {
+pub async fn insert_gamenight(conn: DbConn, new_gamenight: GameNightNoId) -> Result<usize, DatabaseError> {
-    let insert_result = conn.run(|c| {
+    Ok(conn.run(|c|
         diesel::insert_into(gamenight::table)
             .values(new_gamenight)
             .execute(c)
-    })
+    ).await?)
-    .await;
-    
-    match insert_result {
-        Err(e) => Err(DatabaseError::Query(e.to_string())),
-        _ => Ok(()),
-    }
 }
 
 pub async fn get_gamenight(conn: &DbConn, game_id: i32) -> Result<GameNight, DatabaseError> {
-    conn.run(move |c| {
+    Ok(conn.run(move |c|
-        match gamenight::table.find(game_id).first(c) {
+        gamenight::table.find(game_id).first(c)
-            Ok(gamenight) => Ok(gamenight),
+    ).await?)
-            Err(error) => Err(DatabaseError::Query(error.to_string()))
-        }
-    }).await
 }
 
-pub async fn delete_gamenight(conn: &DbConn, game_id: i32) -> Result<(), DatabaseError> {
+pub async fn delete_gamenight(conn: &DbConn, game_id: i32) -> Result<usize, DatabaseError> {
-    conn.run(move |c| {
+    Ok(conn.run(move |c|
-        match diesel::delete(gamenight::table.filter(gamenight::id.eq(game_id))).execute(c) {
+        diesel::delete(
-            Ok(_) => Ok(()),
+            gamenight::table.filter(
-            Err(error) => Err(DatabaseError::Query(error.to_string()))
+                gamenight::id.eq(game_id)
-        }
+            )
-    }).await
+        ).execute(c) 
+    ).await?)
 }
 
-pub async fn insert_user(conn: DbConn, new_user: Register) -> Result<(), DatabaseError> {
+pub async fn insert_user(conn: DbConn, new_user: Register) -> Result<usize, DatabaseError> {
     let salt = SaltString::generate(&mut OsRng);
 
     let argon2 = Argon2::default();
 
-    let password_hash = match argon2.hash_password(new_user.password.as_bytes(), &salt) {
+    let password_hash = argon2.hash_password(new_user.password.as_bytes(), &salt)?.to_string();
-        Ok(hash) => hash.to_string(),
-        Err(error) => return Err(DatabaseError::Hash(error)),
-    };
 
-    let user_insert_result = conn
+    Ok(conn.run(move |c| {
-        .run(move |c| {
         c.transaction(|| {
             diesel::insert_into(user::table)
                 .values((
@@ -138,66 +139,43 @@ pub async fn insert_user(conn: DbConn, new_user: Register) -> Result<(), Databas
                 ))
                 .execute(c)?;
 
-                let ids: Vec<i32> = match user::table
+            let id: i32 = user::table
                 .filter(
                     user::username
                         .eq(&new_user.username)
                         .and(user::email.eq(&new_user.email)),
                 )
                 .select(user::id)
-                    .get_results(c)
+                .first(c)?;
-                {
-                    Ok(id) => id,
-                    Err(e) => return Err(e),
-                };
 
             diesel::insert_into(pwd::table)
-                    .values((pwd::user_id.eq(ids[0]), pwd::password.eq(&password_hash)))
+                .values((pwd::user_id.eq(id), pwd::password.eq(&password_hash)))
                 .execute(c)
         })
     })
-        .await;
+    .await?)
-
-    match user_insert_result {
-        Err(e) => Err(DatabaseError::Query(e.to_string())),
-        _ => Ok(()),
-    }
 }
 
 pub async fn login(conn: DbConn, login: Login) -> Result<LoginResult, DatabaseError> {
     conn.run(move |c| -> Result<LoginResult, DatabaseError> {
-        let id: i32 = match user::table
+        let id: i32 = user::table
             .filter(user::username.eq(&login.username))
             .or_filter(user::email.eq(&login.username))
             .select(user::id)
-            .first(c)
+            .first(c)?;
-        {
-            Ok(id) => id,
-            Err(error) => return Err(DatabaseError::Query(error.to_string())),
-        };
 
-        let pwd: String = match pwd::table
+        let pwd: String = pwd::table
             .filter(pwd::user_id.eq(id))
             .select(pwd::password)
-            .first(c)
+            .first(c)?;
-        {
-            Ok(pwd) => pwd,
-            Err(error) => return Err(DatabaseError::Query(error.to_string())),
-        };
 
-        let parsed_hash = match PasswordHash::new(&pwd) {
+        let parsed_hash = PasswordHash::new(&pwd)?;
-            Ok(hash) => hash,
-            Err(error) => return Err(DatabaseError::Hash(error)),
-        };
 
         if Argon2::default()
             .verify_password(&login.password.as_bytes(), &parsed_hash)
             .is_ok()
         {
-            let user: User = match user::table.find(id).first(c) {
+            let user: User = user::table.find(id).first(c)?;
-                Ok(user) => user,
-                Err(error) => return Err(DatabaseError::Query(error.to_string()))
-            };
 
             Ok(LoginResult {
                 result: true,
@@ -213,9 +191,9 @@ pub async fn login(conn: DbConn, login: Login) -> Result<LoginResult, DatabaseEr
     .await
 }
 
-pub async fn get_user(conn: DbConn, id: i32) -> User {
+pub async fn get_user(conn: DbConn, id: i32) -> Result<User, DatabaseError> {
-    conn.run(move |c| user::table.filter(user::id.eq(id)).first(c).unwrap())
+    Ok(conn.run(move |c| user::table.filter(user::id.eq(id)).first(c))
-        .await
+        .await?)
 }
 
 pub fn unique_username(