allow specifying some protected peers in the config file

node/modules/lp2p/libp2p.go

@@ -63,9 +63,17 @@ func genLibp2pKey() (crypto.PrivKey, error) {
 
 // Misc options
 
-func ConnectionManager(low, high int, grace time.Duration) func() (opts Libp2pOpts, err error) {
-	return func() (opts Libp2pOpts, err error) {
+func ConnectionManager(low, high int, grace time.Duration, protected []string) func() (opts Libp2pOpts, err error) {
+	return func() (Libp2pOpts, error) {
 		cm := connmgr.NewConnManager(low, high, grace)
+		for _, p := range protected {
+			pid, err := peer.IDFromString(p)
+			if err != nil {
+				return nil, xerrors.Errorf("failed to parse peer ID in protected peers array: %w", err)
+			}
+
+			cm.Protect(pid, "config-prot")
+		}
 		opts.Opts = append(opts.Opts, libp2p.ConnectionManager(cm))
 		return
 	}