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sendaddresses.go
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/
sendaddresses.go
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package addressexchange
import (
"math/rand"
"github.com/kaspaclassic/caspad/app/appmessage"
"github.com/kaspaclassic/caspad/infrastructure/network/addressmanager"
"github.com/kaspaclassic/caspad/infrastructure/network/netadapter/router"
)
// SendAddressesContext is the interface for the context needed for the SendAddresses flow.
type SendAddressesContext interface {
AddressManager() *addressmanager.AddressManager
}
// SendAddresses sends addresses to a peer that requests it.
func SendAddresses(context SendAddressesContext, incomingRoute *router.Route, outgoingRoute *router.Route) error {
for {
_, err := incomingRoute.Dequeue()
if err != nil {
return err
}
addresses := context.AddressManager().Addresses()
msgAddresses := appmessage.NewMsgAddresses(shuffleAddresses(addresses))
err = outgoingRoute.Enqueue(msgAddresses)
if err != nil {
return err
}
}
}
// shuffleAddresses randomizes the given addresses sent if there are more than the maximum allowed in one message.
func shuffleAddresses(addresses []*appmessage.NetAddress) []*appmessage.NetAddress {
addressCount := len(addresses)
if addressCount < appmessage.MaxAddressesPerMsg {
return addresses
}
shuffleAddresses := make([]*appmessage.NetAddress, addressCount)
copy(shuffleAddresses, addresses)
rand.Shuffle(addressCount, func(i, j int) {
shuffleAddresses[i], shuffleAddresses[j] = shuffleAddresses[j], shuffleAddresses[i]
})
// Truncate it to the maximum size.
shuffleAddresses = shuffleAddresses[:appmessage.MaxAddressesPerMsg]
return shuffleAddresses
}