adding buildPrivateServiceCandidates

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

management/internals/network_map_db/pgsql/domain.go

@@ -0,0 +1,38 @@
+package networkmap_pgsql
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/jackc/pgx/v5"
+)
+
+const (
+	GetDomainsQuery = `
+	select domain, target_cluster
+	from domains
+	where account_id=$1
+	`
+)
+
+func (pg *PgStore) GetDomains(ctx context.Context, accountId string) ([]domain, error) {
+	c, err := pg.Pool.Acquire(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return GetDomainsViaPgxConnection(ctx, c.Conn(), accountId)
+}
+
+func GetDomainsViaPgxConnection(ctx context.Context, conn *pgx.Conn, accountId string) ([]domain, error) {
+	rows, err := conn.Query(ctx, GetDomainsQuery, accountId)
+	if err != nil {
+		return nil, err
+	}
+
+	return pgx.CollectRows(rows, pgx.RowToStructByName[domain])
+}
+
+type domain struct {
+	Domain        sql.NullString
+	TargetCluster sql.NullString
+}