// NewBFTCoSiProtocol returns a new bftcosi struct
func NewBFTCoSiProtocol(n *onet.TreeNodeInstance, verify VerificationFunction) (*ProtocolBFTCoSi, error) {
// initialize the bftcosi node/protocol-instance
bft := &ProtocolBFTCoSi{
TreeNodeInstance: n,
collectStructs: collectStructs{
prepare: cosi.NewCosi(n.Suite(), n.Private(), n.Roster().Publics()),
commit: cosi.NewCosi(n.Suite(), n.Private(), n.Roster().Publics()),
},
verifyChan: make(chan bool),
VerificationFunction: verify,
threshold: (len(n.Tree().List()) + 1) * 2 / 3,
Msg: make([]byte, 0),
Data: make([]byte, 0),
}
idx, _ := n.Roster().Search(bft.ServerIdentity().ID)
bft.index = idx
// Registering channels.
err := bft.RegisterChannels(&bft.announceChan,
&bft.challengePrepareChan, &bft.challengeCommitChan,
&bft.commitChan, &bft.responseChan)
if err != nil {
return nil, err
}
n.OnDoneCallback(bft.nodeDone)
return bft, nil
}
// NewProtocol returns a ProtocolCosi with the node set with the right channels.
// Use this function like this:
// ```
// round := NewRound****()
// fn := func(n *onet.Node) onet.ProtocolInstance {
// pc := NewProtocolCosi(round,n)
// return pc
// }
// onet.RegisterNewProtocolName("cothority",fn)
// ```
func NewProtocol(node *onet.TreeNodeInstance) (onet.ProtocolInstance, error) {
var err error
// XXX just need to take care to take the global list of cosigners once we
// do the exception stuff
publics := make([]abstract.Point, len(node.Roster().List))
for i, e := range node.Roster().List {
publics[i] = e.Public
}
c := &CoSi{
cosi: cosi.NewCosi(node.Suite(), node.Private(), publics),
TreeNodeInstance: node,
done: make(chan bool),
tempCommitLock: new(sync.Mutex),
tempResponseLock: new(sync.Mutex),
}
// Register the channels we want to register and listens on
if err := node.RegisterChannel(&c.announce); err != nil {
return c, err
}
if err := node.RegisterChannel(&c.commit); err != nil {
return c, err
}
if err := node.RegisterChannel(&c.challenge); err != nil {
return c, err
}
if err := node.RegisterChannel(&c.response); err != nil {
return c, err
}
return c, err
}