adding buildPrivateServiceCandidates

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

management/internals/network_map_db/pgsql/service.go

@@ -0,0 +1,41 @@
+package networkmap_pgsql
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/jackc/pgx/v5"
+)
+
+const (
+	GetServicesQuery = `
+	select enabled, private, array (select json_array_elements_text(access_groups::json)) as access_groups, proxy_cluster, domain
+	from services
+	where account_id=$1
+	`
+)
+
+func (pg *PgStore) GetPrivateServices(ctx context.Context, accountId string) ([]service, error) {
+	c, err := pg.Pool.Acquire(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return GetPrivateServicesViaPgxConnection(ctx, c.Conn(), accountId)
+}
+
+func GetPrivateServicesViaPgxConnection(ctx context.Context, conn *pgx.Conn, accountId string) ([]service, error) {
+	rows, err := conn.Query(ctx, GetServicesQuery, accountId)
+	if err != nil {
+		return nil, err
+	}
+
+	return pgx.CollectRows(rows, pgx.RowToStructByName[service])
+}
+
+type service struct {
+	Enabled      sql.NullBool
+	Private      sql.NullBool
+	AccessGroups []string
+	ProxyCluster sql.NullString
+	Domain       sql.NullString
+}