Initial commit.

backend/infrastructure/src/common/database_connection.rs

@@ -0,0 +1,34 @@
+use rusqlite::Connection as RusqliteConnection;
+use std::env;
+use std::path::Path;
+use diesel::{Connection, SqliteConnection};
+
+pub struct DatabaseConnection {
+    pub connection: RusqliteConnection,
+    pub diesel_connection: SqliteConnection,
+    pub database_has_been_created: bool,
+}
+
+impl DatabaseConnection {
+    pub fn init() -> Self {
+        let sqlite_database_name = env::var("SQLITE_DATABASE_NAME").expect("SQLITE_DATABASE_NAME must be set.");
+
+        let database_existed_before_connection_initialisation = does_database_exist(&sqlite_database_name);
+
+        let connection = RusqliteConnection::open(sqlite_database_name.clone())
+            .expect("Unable to connect to SQLite database…");
+
+        let diesel_connection = SqliteConnection::establish(&sqlite_database_name.clone())
+            .unwrap_or_else(|_| panic!("Error connecting to {}", sqlite_database_name.clone()));
+
+        Self {
+            connection,
+            diesel_connection,
+            database_has_been_created: !database_existed_before_connection_initialisation
+        }
+    }
+}
+
+fn does_database_exist(database_name: &String) -> bool {
+    Path::new(database_name).exists()
+}

backend/infrastructure/src/common/database_initialisation.rs

@@ -0,0 +1,30 @@
+use std::sync::{Arc, Mutex};
+use rusqlite::{Connection, Error};
+
+pub fn initialise_database_tables(connection: &Arc<Mutex<Connection>>) -> Result<(), Error> {
+    connection.lock()
+        .unwrap()
+        .execute_batch(
+            "
+            BEGIN;
+            CREATE TABLE IF NOT EXISTS configuration (
+                    id TEXT PRIMARY KEY,
+                    initialisation_code VARCHAR
+            );
+            CREATE TABLE IF NOT EXISTS system_resources (
+                id TEXT PRIMARY KEY,
+                datetime INTEGER NOT NULL,
+                cpu_usage INTEGER NOT NULL,
+                total_memory INTEGER NOT NULL,
+                used_memory INTEGER NOT NULL
+            );
+            CREATE TABLE IF NOT EXISTS \"user\" (
+                id TEXT PRIMARY KEY,
+                username VARCHAR NOT NULL,
+                encrypted_password VARCHAR NOT NULL
+            );
+            COMMIT;
+            "
+        )?;
+    Ok(())
+}

backend/infrastructure/src/common/mod.rs

@@ -0,0 +1,2 @@
+pub mod database_connection;
+pub mod database_initialisation;