RustRusotoRocket_DataAccessTrait

data.rs

// to block and await
use futures::executor::block_on;

// Would allow us to swap out implementations for testing or to change persistence layer
trait UserCrud {
    fn get_user(&self, id: String) -> Result<User, &'static str>;
    fn delete_user(&self, id: String) -> Result<bool, &'static str>;
    fn save_user(&self, user: User) -> Result<bool, &'static str>;
}

// Has everything we need to know about our dynamo implementation
struct DynamoUserCrud {
    table_name: String,
    client: DynamoDbClient,
}

// Actually implement the trait for our dynamo struct
impl UserCrud for DynamoUserCrud {
    fn get_user(&self, id: String) -> Result<User, &'static str> {
        block_on(dynamo_get_user(&self.client, self.table_name.to_string(), id))
    }
    fn delete_user(&self, id: String) -> Result<bool, &'static str> {
        block_on(dynamo_delete_user(&self.client, self.table_name.to_string(), id))
    }
    fn save_user(&self, user: User) -> Result<bool, &'static str> {
        block_on(dynamo_save_user(&self.client, self.table_name.to_string(), user))
    }
}