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message_handler_set.go
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/
message_handler_set.go
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// Copyright (C) 2021-2023 Chronicle Labs, Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package sets
import pubsub "github.com/libp2p/go-libp2p-pubsub"
// MessageHandler can ba implemented by type that supports handling the PubSub
// system messages.
type MessageHandler interface {
// Published is called when new message is published.
Published(topic string, msg []byte)
// Received is called when new message is received.
Received(topic string, msg *pubsub.Message, result pubsub.ValidationResult)
}
// MessageHandlerSet stores multiple instances of the MessageHandler interface.
type MessageHandlerSet struct {
messageHandler []MessageHandler
}
// NewMessageHandlerSet creates new instance of the MessageHandlerSet.
func NewMessageHandlerSet() *MessageHandlerSet {
return &MessageHandlerSet{}
}
// Add adds new MessageHandler to the set.
func (n *MessageHandlerSet) Add(messageHandler ...MessageHandler) {
n.messageHandler = append(n.messageHandler, messageHandler...)
}
// Published invokes all registered handlers.
func (n *MessageHandlerSet) Published(topic string, msg []byte) {
for _, messageHandler := range n.messageHandler {
messageHandler.Published(topic, msg)
}
}
// Received invokes all registered handlers.
func (n *MessageHandlerSet) Received(topic string, msg *pubsub.Message, result pubsub.ValidationResult) {
for _, messageHandler := range n.messageHandler {
messageHandler.Received(topic, msg, result)
}
}
var _ MessageHandler = (*MessageHandlerSet)(nil)