feat: init and define database ops as interfaces to support multiple DBs

db/db-core/src/ops.rs

@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2022  Aravinth Manivannan <realaravinth@batsense.net>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+//! meta operations like migration and connecting to a database
+use crate::dev::*;
+
+/// Database operations trait(migrations, pool creation and fetching connection from pool)
+pub trait DBOps: GetConnection + Migrate {}
+
+/// Get database connection
+#[async_trait]
+pub trait GetConnection {
+    /// database connection type
+    type Conn;
+    /// database specific error-type
+    /// get connection from connection pool
+    async fn get_conn(&self) -> DBResult<Self::Conn>;
+}
+
+/// Create databse connection
+#[async_trait]
+pub trait Connect {
+    /// database specific pool-type
+    type Pool: MCDatabase;
+    /// database specific error-type
+    /// create connection pool
+    async fn connect(self) -> DBResult<Self::Pool>;
+}
+
+/// database migrations
+#[async_trait]
+pub trait Migrate: MCDatabase {
+    /// database specific error-type
+    /// run migrations
+    async fn migrate(&self) -> DBResult<()>;
+}