func (b GraphBuilderCentralized) Rcv(msg bh.Msg, ctx bh.RcvContext) error {
dict := ctx.Dict(GraphDict)
var link nom.Link
switch dm := msg.Data().(type) {
case nom.LinkAdded:
link = nom.Link(dm)
case nom.LinkDeleted:
link = nom.Link(dm)
default:
return fmt.Errorf("GraphBuilderCentralized: unsupported message type %v",
msg.Type())
}
nf, _ := nom.ParsePortUID(link.From)
nt, _ := nom.ParsePortUID(link.To)
if nf == nt {
return fmt.Errorf("%v is a loop", link)
}
k := string(nf)
links := make(map[nom.UID][]nom.Link)
if v, err := dict.Get(k); err == nil {
links = v.(map[nom.UID][]nom.Link)
}
links[nt.UID()] = append(links[nt.UID()], link)
return dict.Put(k, links)
}
func (h flowHandler) Rcv(msg bh.Msg, ctx bh.RcvContext) error {
switch data := msg.Data().(type) {
case nom.FlowEntryAdded:
return confirmFlowEntryForPath(nom.FlowEntry(data.Flow), ctx)
case nom.FlowEntryDeleted:
return delFlowEntryFromPath(nom.FlowEntry(data.Flow), ctx)
}
return fmt.Errorf("flowHandler: unsupported message %v", msg.Type())
}