// subscribe will add the given protocol client to the channel to subscribe to
func (b *PubSubBackend) subscribe(data interface{}, client server.ProtocolClient) error {
d, _ := data.([][]byte)
if len(d) < 1 {
return nil
} else {
for _, k := range d {
key := string(k)
if topic, ok := b.topics[key]; ok {
topic.Lock()
id := client.Address()
if _, ok = topic.clients[id]; !ok {
topic.clients[id] = empty
topic.size++
}
topic.Unlock()
} else {
topic := new(TopicChannel)
topic.clients = make(map[string]struct{})
topic.size = 1
topic.clients[client.Address()] = empty
b.topics[key] = topic
}
}
return nil
}
}
func (b *PubSubBackend) unsubscribe(data interface{}, client server.ProtocolClient) error {
d, _ := data.([][]byte)
if len(d) < 1 {
return nil
} else {
for _, k := range d {
key := string(k)
if topic, ok := b.topics[key]; ok {
topic.Lock()
id := client.Address()
if _, ok = topic.clients[id]; ok {
delete(topic.clients, id)
topic.size--
}
topic.Unlock()
}
}
return nil
}
}