added login logic

src/login/loginDb.cpp

@@ -0,0 +1,38 @@
+#include "loginDb.hpp"
+#include "databasepool.h"
+#include <optional>
+
+using namespace sqlite_orm;
+
+namespace login {
+
+int createUser(const std::string& username, const std::string& password_hash){
+    if (username.empty() || password_hash.empty())
+        return -1;
+
+    int64_t id;
+    auto db = dbpool.acquire();
+
+    auto user = db->get_optional<User>(
+    where(c(&User::username) == username)
+    );
+
+    if (user.has_value()) {
+        id = user.value().id;
+    } else {
+        auto c = newUser(username, password_hash);
+        id = db->insert(c);
+    }
+    dbpool.release(db);
+    return id;
+}
+
+std::optional<User> getUser(const std::string& username){
+    auto db = dbpool.acquire();
+    auto user = db->get_optional<User>(
+        where(c(&User::username) == username)
+    );
+    dbpool.release(db);
+    return user;
+}
+}