[management] network map from nmap data type (#6919)

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

management/internals/network_map_db/pgsql/group.go

@@ -0,0 +1,64 @@
+package networkmap_pgsql
+
+import (
+	"context"
+	"database/sql"
+	"encoding/json"
+	"reflect"
+
+	"github.com/jackc/pgx/v5"
+	networkmapdb "github.com/netbirdio/netbird/management/internals/network_map_db"
+	"github.com/netbirdio/netbird/shared/management/networkmap/nmdata"
+)
+
+const (
+	GetGroupsQuery = `
+	select id, name, public_id, resources,
+	(
+	  select array_agg(group_peers.peer_id)
+      from group_peers
+	  where group_peers.group_id = groups.id and group_peers.account_id=$1
+	) as peers
+	from groups where account_id=$1
+	`
+)
+
+// we also return a resource-to-group index.
+// an alternative is to add json indexes, query this directly. Not sure how expensive
+// json indexes are. TODO (dmitri) verify and maybe change the implementation here.
+func (pgc *PgStoreConn) GetGroups(ctx context.Context, accountId string) ([]nmdata.Group, map[string]map[string]any, error) {
+	rows, err := pgc.Conn.Query(ctx, GetGroupsQuery, accountId)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	groups, err := pgx.CollectRows(rows, pgx.RowToStructByName[group])
+	toret := make([]nmdata.Group, 0, len(groups))
+	resourceToGroupIdx := make(map[string]map[string]any)
+
+	for _, g := range groups {
+		dg := nmdata.Group{}
+		err := networkmapdb.FromSqlTypesToSharedTypes(
+			reflect.ValueOf(&g), reflect.ValueOf(&dg))
+		if err != nil {
+			return nil, nil, err
+		}
+		toret = append(toret, dg)
+		for _, resource := range dg.Resources {
+			if _, ok := resourceToGroupIdx[resource.ID]; !ok {
+				resourceToGroupIdx[resource.ID] = make(map[string]any)
+			}
+			resourceToGroupIdx[resource.ID][g.ID] = struct{}{}
+		}
+	}
+
+	return toret, resourceToGroupIdx, err
+}
+
+type group struct {
+	ID        string
+	Name      sql.NullString
+	PublicID  sql.NullString
+	Resources json.RawMessage
+	Peers     []string
+}