add net protect api methods

fix #8015

node/impl/net/protect.go

@@ -0,0 +1,35 @@
+package net
+
+import (
+	"context"
+
+	"github.com/libp2p/go-libp2p-core/peer"
+)
+
+const apiProtectTag = "api"
+
+func (a *NetAPI) NetProtectAdd(ctx context.Context, peers []peer.ID) error {
+	for _, p := range peers {
+		a.Host.ConnManager().Protect(p, apiProtectTag)
+	}
+
+	return nil
+}
+
+func (a *NetAPI) NetProtectRemove(ctx context.Context, peers []peer.ID) error {
+	for _, p := range peers {
+		a.Host.ConnManager().Unprotect(p, apiProtectTag)
+	}
+
+	return nil
+}
+
+func (a *NetAPI) NetProtectList(ctx context.Context) (result []peer.ID, err error) {
+	for _, conn := range a.Host.Network().Conns() {
+		if a.Host.ConnManager().IsProtected(conn.RemotePeer(), apiProtectTag) {
+			result = append(result, conn.RemotePeer())
+		}
+	}
+
+	return
+}