adding network_map_data: compute Routers field

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

management/internals/network_map_db/pgsql/networks.go

@@ -0,0 +1,52 @@
+package networkmap_pgsql
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/jackc/pgx/v5"
+)
+
+const (
+	GetNetworksQuery = `
+	select id, public_id
+	from networks where account_id=$1
+	`
+)
+
+func (pg *PgStore) GetNetworks(ctx context.Context, accountId string) ([]network, error) {
+	c, err := pg.Pool.Acquire(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return GetNetworksViaPgxConnection(ctx, c.Conn(), accountId)
+}
+
+func GetNetworksViaPgxConnection(ctx context.Context, con *pgx.Conn, accountId string) ([]network, error) {
+	rows, err := con.Query(ctx, GetGroupsQuery, accountId)
+	if err != nil {
+		return nil, err
+	}
+	return pgx.CollectRows(rows, pgx.RowToStructByName[network])
+}
+
+func GetNetworkXIDToPublicIdMapViaPgxConnection(ctx context.Context, con *pgx.Conn, accountId string) (map[string]string, error) {
+	networks, err := GetNetworksViaPgxConnection(ctx, con, accountId)
+	if err != nil {
+		return nil, err
+	}
+
+	toret := make(map[string]string)
+	for _, n := range networks {
+		if n.PublicID.Valid {
+			toret[n.ID] = n.PublicID.String
+		}
+	}
+
+	return toret, nil
+}
+
+type network struct {
+	ID       string
+	PublicID sql.NullString
+}