// makeSignedAnnouncement creates a []byte that contains an encoded and signed
// host announcement for the given net address.
func makeSignedAnnouncement(na modules.NetAddress) ([]byte, error) {
sk, pk, err := crypto.GenerateKeyPair()
if err != nil {
return nil, err
}
spk := types.SiaPublicKey{
Algorithm: types.SignatureEd25519,
Key: pk[:],
}
return modules.CreateAnnouncement(na, spk, sk)
}
// announce creates an announcement transaction and submits it to the network.
func (h *Host) announce(addr modules.NetAddress) error {
// The wallet needs to be unlocked to add fees to the transaction, and the
// host needs to have an active unlock hash that renters can make payment
// to.
if !h.wallet.Unlocked() {
return errAnnWalletLocked
}
err := h.checkUnlockHash()
if err != nil {
return err
}
// Create the announcement that's going to be added to the arbitrary data
// field of the transaction.
signedAnnouncement, err := modules.CreateAnnouncement(addr, h.publicKey, h.secretKey)
if err != nil {
return err
}
// Create a transaction, with a fee, that contains the full announcement.
txnBuilder := h.wallet.StartTransaction()
_, fee := h.tpool.FeeEstimation()
fee = fee.Mul64(500) // Estimated txn size (in bytes) of a host announcement.
err = txnBuilder.FundSiacoins(fee)
if err != nil {
txnBuilder.Drop()
return err
}
_ = txnBuilder.AddMinerFee(fee)
_ = txnBuilder.AddArbitraryData(signedAnnouncement)
txnSet, err := txnBuilder.Sign(true)
if err != nil {
txnBuilder.Drop()
return err
}
// Add the transactions to the transaction pool.
err = h.tpool.AcceptTransactionSet(txnSet)
if err != nil {
txnBuilder.Drop()
return err
}
h.announced = true
h.log.Printf("INFO: Successfully announced as %v", addr)
return nil
}