add ValidatorData field to Message

Useful for passing data from the validation to the application.

pubsub.go

@@ -151,6 +151,7 @@ type PubSubRouter interface {
 type Message struct {
 	*pb.Message
 	ReceivedFrom peer.ID
+	VaidatorData interface{}
 }
 
 func (m *Message) GetFrom() peer.ID {
@@ -688,7 +689,7 @@ func (p *PubSub) handleIncomingRPC(rpc *RPC) {
 			continue
 		}
 
-		msg := &Message{pmsg, rpc.from}
+		msg := &Message{pmsg, rpc.from, nil}
 		p.pushMsg(msg)
 	}
 

topic.go

@@ -167,7 +167,7 @@ func (t *Topic) Publish(ctx context.Context, data []byte, opts ...PubOpt) error
 	}
 
 	select {
-	case t.p.publish <- &Message{m, id}:
+	case t.p.publish <- &Message{m, id, nil}:
 	case <-t.p.ctx.Done():
 		return t.p.ctx.Err()
 	}