lnd.xprv/watchtower/wtdb/tower.go
2019-03-15 02:30:09 -07:00

66 lines
1.8 KiB
Go

package wtdb
import (
"net"
"sync"
"github.com/btcsuite/btcd/btcec"
"github.com/lightningnetwork/lnd/lnwire"
)
// Tower holds the necessary components required to connect to a remote tower.
// Communication is handled by brontide, and requires both a public key and an
// address.
type Tower struct {
// ID is a unique ID for this record assigned by the database.
ID uint64
// IdentityKey is the public key of the remote node, used to
// authenticate the brontide transport.
IdentityKey *btcec.PublicKey
// Addresses is a list of possible addresses to reach the tower.
Addresses []net.Addr
mu sync.RWMutex
}
// AddAddress adds the given address to the tower's in-memory list of addresses.
// If the address's string is already present, the Tower will be left
// unmodified. Otherwise, the adddress is prepended to the beginning of the
// Tower's addresses, on the assumption that it is fresher than the others.
func (t *Tower) AddAddress(addr net.Addr) {
t.mu.Lock()
defer t.mu.Unlock()
// Ensure we don't add a duplicate address.
addrStr := addr.String()
for _, existingAddr := range t.Addresses {
if existingAddr.String() == addrStr {
return
}
}
// Add this address to the front of the list, on the assumption that it
// is a fresher address and will be tried first.
t.Addresses = append([]net.Addr{addr}, t.Addresses...)
}
// LNAddrs generates a list of lnwire.NetAddress from a Tower instance's
// addresses. This can be used to have a client try multiple addresses for the
// same Tower.
func (t *Tower) LNAddrs() []*lnwire.NetAddress {
t.mu.RLock()
defer t.mu.RUnlock()
addrs := make([]*lnwire.NetAddress, 0, len(t.Addresses))
for _, addr := range t.Addresses {
addrs = append(addrs, &lnwire.NetAddress{
IdentityKey: t.IdentityKey,
Address: addr,
})
}
return addrs
}