lnd.xprv/lnwire/announcement_signatures.go

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package lnwire
import (
"io"
"github.com/roasbeef/btcd/btcec"
)
// AnnounceSignatures this is a direct message between two endpoints of a
// channel and serves as an opt-in mechanism to allow the announcement of
// the channel to the rest of the network. It contains the necessary
// signatures by the sender to construct the channel announcement message.
type AnnounceSignatures struct {
// ChannelID is the unique description of the funding transaction.
// Channel id is better for users and debugging and short channel id is
// used for quick test on existence of the particular utxo inside the
// block chain, because it contains information about block.
ChannelID ChannelID
// ShortChannelID is the unique description of the funding
// transaction. It is constructed with the most significant 3 bytes
// as the block height, the next 3 bytes indicating the transaction
// index within the block, and the least significant two bytes
// indicating the output index which pays to the channel.
ShortChannelID ShortChannelID
// NodeSignature is the signature which contains the signed announce
// channel message, by this signature we proof that we posses of the
// node pub key and creating the reference node_key -> bitcoin_key.
NodeSignature *btcec.Signature
// BitcoinSignature is the signature which contains the signed node
// public key, by this signature we proof that we posses of the
// bitcoin key and and creating the reverse reference bitcoin_key ->
// node_key.
BitcoinSignature *btcec.Signature
}
// A compile time check to ensure AnnounceSignatures implements the
// lnwire.Message interface.
var _ Message = (*AnnounceSignatures)(nil)
// Decode deserializes a serialized AnnounceSignatures stored in the passed
// io.Reader observing the specified protocol version.
//
// This is part of the lnwire.Message interface.
func (a *AnnounceSignatures) Decode(r io.Reader, pver uint32) error {
return readElements(r,
&a.ChannelID,
&a.ShortChannelID,
&a.NodeSignature,
&a.BitcoinSignature,
)
}
// Encode serializes the target AnnounceSignatures into the passed io.Writer
// observing the protocol version specified.
//
// This is part of the lnwire.Message interface.
func (a *AnnounceSignatures) Encode(w io.Writer, pver uint32) error {
return writeElements(w,
a.ChannelID,
a.ShortChannelID,
a.NodeSignature,
a.BitcoinSignature,
)
}
// MsgType returns the integer uniquely identifying this message type on the
// wire.
//
// This is part of the lnwire.Message interface.
func (a *AnnounceSignatures) MsgType() MessageType {
return MsgAnnounceSignatures
}
// MaxPayloadLength returns the maximum allowed payload size for this message
// observing the specified protocol version.
//
// This is part of the lnwire.Message interface.
func (a *AnnounceSignatures) MaxPayloadLength(pver uint32) uint32 {
var length uint32
// ChannelID - 36 bytes
length += 36
// ShortChannelID - 8 bytes
length += 8
// NodeSignatures - 64 bytes
length += 64
// BitcoinSignatures - 64 bytes
length += 64
return length
}