Create user repository

rotom_core/Cargo.toml

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+[package]
+name = "rotom_core"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+async-trait = "0.1.85"

rotom_core/src/lib.rs

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+pub mod repository;

rotom_core/src/repository/mod.rs

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+use user_repository::UserRepository;
+
+pub mod user_repository;
+
+#[async_trait::async_trait]
+pub trait RepositoryProvider {
+    type BackendError: std::error::Error;
+
+    type Repository<'a>: Repository<BackendError = <Self as RepositoryProvider>::BackendError> + Send + Sync
+    where
+        Self: 'a;
+
+    async fn get(&self) -> Result<Self::Repository<'_>, Self::BackendError>;
+}
+
+pub trait Repository
+where
+    Self: UserRepository<BackendError = <Self as Repository>::BackendError>,
+{
+    type BackendError: std::error::Error;
+}

rotom_core/src/repository/user_repository.rs

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+#[async_trait::async_trait]
+pub trait UserRepository {
+    type BackendError: std::error::Error;
+
+    async fn user(&mut self, id: i32) -> Result<Option<User>, Self::BackendError>;
+
+    async fn insert_user(&mut self, new_user: NewUser) -> Result<User, Self::BackendError>;
+
+    async fn update_user(&mut self, user: User) -> Result<Option<User>, Self::BackendError>;
+
+    async fn remove_user(&mut self, id: i32) -> Result<Option<User>, Self::BackendError>;
+}
+
+pub struct User {
+    pub id: i32,
+    pub discord_user_id: u64,
+    pub pokemon_go_code: Option<String>,
+    pub pokemon_pocket_code: Option<String>,
+    pub switch_code: Option<String>,
+}
+
+pub struct NewUser {
+    pub discord_user_id: u64,
+    pub pokemon_go_code: Option<String>,
+    pub pokemon_pocket_code: Option<String>,
+    pub switch_code: Option<String>,
+}