package watchtower import ( "fmt" "net" "time" "github.com/btcsuite/btcd/btcec" "github.com/btcsuite/btcd/wire" "github.com/btcsuite/btcutil" "github.com/lightningnetwork/lnd/tor" "github.com/lightningnetwork/lnd/watchtower/lookout" ) const ( // DefaultPeerPort is the default server port to which clients can // connect. DefaultPeerPort = 9911 // DefaultReadTimeout is the default timeout after which the tower will // hang up on a client if nothing is received. DefaultReadTimeout = 15 * time.Second // DefaultWriteTimeout is the default timeout after which the tower will // hang up on a client if it is unable to send a message. DefaultWriteTimeout = 15 * time.Second ) var ( // DefaultPeerPortStr is the default server port as a string. DefaultPeerPortStr = fmt.Sprintf(":%d", DefaultPeerPort) ) // Config defines the resources and parameters used to configure a Watchtower. // All nil-able elements with the Config must be set in order for the Watchtower // to function properly. type Config struct { // BlockFetcher supports the ability to fetch blocks from the network by // hash. BlockFetcher lookout.BlockFetcher // DB provides access to persistent storage of sessions and state // updates uploaded by watchtower clients, and the ability to query for // breach hints when receiving new blocks. DB DB // EpochRegistrar supports the ability to register for events // corresponding to newly created blocks. EpochRegistrar lookout.EpochRegistrar // Net specifies the network type that the watchtower will use to listen // for client connections. Either a clear net or Tor are supported. Net tor.Net // NewAddress is used to generate reward addresses, where a cut of // successfully sent funds can be received. NewAddress func() (btcutil.Address, error) // NodePrivKey is private key to be used in accepting new brontide // connections. NodePrivKey *btcec.PrivateKey // PublishTx provides the ability to send a signed transaction to the // network. // // TODO(conner): replace with lnwallet.WalletController interface to // have stronger guarantees wrt. returned error types. PublishTx func(*wire.MsgTx) error // ListenAddrs specifies which address to which clients may connect. ListenAddrs []net.Addr // ReadTimeout specifies how long a client may go without sending a // message. ReadTimeout time.Duration // WriteTimeout specifies how long a client may go without reading a // message from the other end, if the connection has stopped buffering // the server's replies. WriteTimeout time.Duration }