func (a *AsPathPrependAction) apply(path *table.Path) *table.Path {
var asn uint32
if a.useLeftMost {
asns := path.GetAsSeqList()
if len(asns) == 0 {
log.WithFields(log.Fields{
"Topic": "Policy",
"Type": "AsPathPrepend Action",
}).Error("aspath length is zero.")
return path
}
asn = asns[0]
log.WithFields(log.Fields{
"Topic": "Policy",
"Type": "AsPathPrepend Action",
"LastAs": asn,
"Repeat": a.repeat,
}).Debug("use last AS.")
} else {
asn = a.asn
}
path.PrependAsn(asn, a.repeat)
return path
}