// Handles the load balancing event of a topio.
func (o *Overlay) handleBalance(msg *proto.Message, topicId *big.Int, prevHop *big.Int) (bool, error) {
sid := topicId.String()
// Fetch the topic or report not found
o.lock.RLock()
top, ok := o.topics[sid]
topName := o.names[sid]
o.lock.RUnlock()
if !ok {
// No error, but not handled either
return false, nil
}
// Fetch the recipient and either forward or deliver
node, err := top.Balance(prevHop)
if err != nil {
return true, err
}
// If it's a remote node, forward
if node.Cmp(o.pastry.Self()) != 0 {
o.fwdBalance(node, msg)
return true, nil
}
// Remove all carrier headers and decrypt
head := msg.Head.Meta.(*header)
msg.Head.Meta = head.Meta
if err := msg.Decrypt(); err != nil {
return true, err
}
// Deliver to the application on the specific topic
o.app.HandleBalance(head.Sender, topName, msg)
return true, nil
}
// Handles the receiving of a direct message and delivers the contents upstream.
func (o *Overlay) handleDirect(msg *proto.Message) error {
// Remove all scribe headers and decrypt contents
head := msg.Head.Meta.(*header)
msg.Head.Meta = head.Meta
if err := msg.Decrypt(); err != nil {
return err
}
// Deliver the message upstream
o.app.HandleDirect(head.Sender, msg)
return nil
}