// Balances a message to one of the subscribed nodes.
func (o *Overlay) Balance(topic string, msg *proto.Message) error {
if err := msg.Encrypt(); err != nil {
return err
}
o.sendBalance(pastry.Resolve(topic), msg)
return nil
}
// Removes the subscription from topic.
func (o *Overlay) Unsubscribe(topic string) error {
// Resolve the topic id
id := pastry.Resolve(topic)
sid := id.String()
// Remove the topic name mapping
o.lock.Lock()
delete(o.names, sid)
o.lock.Unlock()
// Remove the scribe subscription
return o.handleUnsubscribe(o.pastry.Self(), id)
}
// Subscribes to the specified scribe topic.
func (o *Overlay) Subscribe(topic string) error {
// Resolve the topic id
id := pastry.Resolve(topic)
sid := id.String()
// Make sure we can map the id back to the textual name
o.lock.RLock()
_, ok := o.names[sid]
o.lock.RUnlock()
if !ok {
o.lock.Lock()
o.names[sid] = topic
o.lock.Unlock()
}
// Subscribe the local node to the topic
return o.handleSubscribe(o.pastry.Self(), id)
}