user usecases & repository methods

internal/repository/postgresql/user.go

@@ -1 +1,47 @@
 package postgresql
+
+import (
+	"context"
+	"fmt"
+
+	"gitea.computernetthings.ru/yash/crypto_alert_bot/internal/entities"
+)
+
+const saveUserQuery = "insert into users(telegram_id) values ($1) returning id"
+
+func (p *Postgresql) SaveUser(ctx context.Context, user *entities.User) (entities.UserID, error) {
+	var id entities.UserID
+
+	err := p.db.QueryRow(ctx, saveUserQuery, user.TelegramID).Scan(&id)
+	if err != nil {
+		return "", fmt.Errorf("failed to exec saveUserQuery: %w", err)
+	}
+
+	return id, nil
+}
+
+const getUserByIDQuery = "select id, telegram_id from users where id = $1"
+
+func (p *Postgresql) UserByID(ctx context.Context, id entities.UserID) (*entities.User, error) {
+	var user entities.User
+
+	err := p.db.QueryRow(ctx, getUserByIDQuery, id).Scan(&user.ID, &user.TelegramID)
+	if err != nil {
+		return nil, fmt.Errorf("failed to exec getUserByIDQuery: %w", err)
+	}
+
+	return &user, nil
+}
+
+const getUserByTelegramIDQuery = "select id, telegram_id from users where telegram_id = $1"
+
+func (p *Postgresql) UserByTelegramID(ctx context.Context, tgID entities.TelegramID) (*entities.User, error) {
+	var user entities.User
+
+	err := p.db.QueryRow(ctx, getUserByTelegramIDQuery, tgID).Scan(&user.ID, &user.TelegramID)
+	if err != nil {
+		return nil, fmt.Errorf("failed to exec getUserByTelegramIDQuery: %w", err)
+	}
+
+	return &user, nil
+}