// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0

package memberlist

// AliveDelegate is used to involve a client in processing
// a node "alive" message. When a node joins, either through
// a UDP gossip or TCP push/pull, we update the state of
// that node via an alive message. This can be used to filter
// a node out and prevent it from being considered a peer
// using application specific logic.
type AliveDelegate interface {
	// NotifyAlive is invoked when a message about a live
	// node is received from the network.  Returning a non-nil
	// error prevents the node from being considered a peer.
	NotifyAlive(peer *Node) error
}