server: implement getuser

server/api/db.go

@@ -10,13 +10,15 @@ import (
 	"github.com/jackc/pgx/v5"
 )
 
+var ErrUserNotFound = errors.New("db: user not found")
+
 func dbGetUser(id string) (*User, error) {
 	query := `SELECT id, name, password FROM users WHERE id = $1`
 	var user User
 	err := db.Pool.QueryRow(context.Background(), query, id).Scan(&user.ID, &user.Name, &user.Password)
 	if errors.Is(err, pgx.ErrNoRows) {
 		slog.Debug("db: user not found", "userid", id)
-		return nil, errors.New("user not found")
+		return nil, ErrUserNotFound
 	} else if err != nil {
 		slog.Error("db: failed to query user", "error", err)
 		return nil, fmt.Errorf("failed to query user")
@@ -32,7 +34,7 @@ func dbGetUserByName(username string) (*User, error) {
 	err := db.Pool.QueryRow(context.Background(), query, username).Scan(&user.ID, &user.Name, &user.Password)
 	if errors.Is(err, pgx.ErrNoRows) {
 		slog.Debug("db: user not found", "username", username)
-		return nil, errors.New("user not found")
+		return nil, ErrUserNotFound
 	} else if err != nil {
 		slog.Error("db: failed to query user", "error", err)
 		return nil, fmt.Errorf("failed to query user")