feat: added db transactions abstraction; cleaned up user registration; repos adapted new abstraction: all repos now support transactions, if present in ctx

internal/domain/registration.go

@@ -0,0 +1,49 @@
+package domain
+
+import (
+	"context"
+	"log/slog"
+)
+
+type RegistrationService struct {
+	tx            Transactor
+	UserService   *UserService
+	InviteService *InviteService
+}
+
+func NewRegistrationService(tx Transactor, u *UserService, i *InviteService) *RegistrationService {
+	return &RegistrationService{tx: tx, UserService: u, InviteService: i}
+}
+
+func (s *RegistrationService) Register(ctx context.Context, inviteCode string, email string, username string, password string) (*User, error) {
+	invite, err := s.InviteService.GetInvite(ctx, inviteCode)
+	if err != nil {
+		slog.ErrorContext(ctx, "failed to get invite", slog.Any("error", err))
+		return nil, err
+	}
+
+	var user *User
+	err = s.tx.WithinTx(ctx, func(ctx context.Context) error {
+		user, err = s.UserService.CreateUser(ctx, email, username, password)
+		if err != nil {
+			slog.ErrorContext(ctx, "failed to create user", slog.Any("error", err))
+			return err
+		}
+
+		err = s.InviteService.ConsumeInvite(ctx, invite.ID, user.ID)
+		if err != nil {
+			slog.ErrorContext(ctx, "failed to consume invite", slog.Any("error", err))
+			return err
+		}
+
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	slog.InfoContext(ctx, "user registration complete",
+		slog.String("user_id", user.ID),
+		slog.String("invite_id", invite.ID))
+	return user, nil
+}