f6b3c25f95
This commit modifies the Message interface to convert the Command method to a MsgType method that uses a new set of message type for all the defined messages. These new messages types nearly exactly match the message types used within the current draft of the BOLT specifications.
145 lines
3.5 KiB
Go
145 lines
3.5 KiB
Go
package lnwire
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import (
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"bytes"
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"io"
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"github.com/roasbeef/btcd/btcec"
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)
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// ChannelAnnouncement message is used to announce the existence of a channel
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// between two peers in the overlay, which is propagated by the discovery
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// service over broadcast handler.
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type ChannelAnnouncement struct {
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// This signatures are used by nodes in order to create cross
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// references between node's channel and node. Requiring both nodes
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// to sign indicates they are both willing to route other payments via
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// this node.
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NodeSig1 *btcec.Signature
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NodeSig2 *btcec.Signature
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// This signatures are used by nodes in order to create cross
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// references between node's channel and node. Requiring the bitcoin
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// signatures proves they control the channel.
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BitcoinSig1 *btcec.Signature
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BitcoinSig2 *btcec.Signature
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// ShortChannelID is the unique description of the funding transaction.
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ShortChannelID ShortChannelID
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// The public keys of the two nodes who are operating the channel, such
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// that is NodeID1 the numerically-lesser than NodeID2 (ascending
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// numerical order).
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NodeID1 *btcec.PublicKey
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NodeID2 *btcec.PublicKey
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// Public keys which corresponds to the keys which was declared in
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// multisig funding transaction output.
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BitcoinKey1 *btcec.PublicKey
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BitcoinKey2 *btcec.PublicKey
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}
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// A compile time check to ensure ChannelAnnouncement implements the
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// lnwire.Message interface.
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var _ Message = (*ChannelAnnouncement)(nil)
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// Decode deserializes a serialized ChannelAnnouncement stored in the passed
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// io.Reader observing the specified protocol version.
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//
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// This is part of the lnwire.Message interface.
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func (a *ChannelAnnouncement) Decode(r io.Reader, pver uint32) error {
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return readElements(r,
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&a.NodeSig1,
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&a.NodeSig2,
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&a.ShortChannelID,
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&a.BitcoinSig1,
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&a.BitcoinSig2,
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&a.NodeID1,
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&a.NodeID2,
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&a.BitcoinKey1,
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&a.BitcoinKey2,
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)
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}
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// Encode serializes the target ChannelAnnouncement into the passed io.Writer
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// observing the protocol version specified.
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//
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// This is part of the lnwire.Message interface.
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func (a *ChannelAnnouncement) Encode(w io.Writer, pver uint32) error {
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return writeElements(w,
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a.NodeSig1,
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a.NodeSig2,
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a.ShortChannelID,
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a.BitcoinSig1,
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a.BitcoinSig2,
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a.NodeID1,
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a.NodeID2,
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a.BitcoinKey1,
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a.BitcoinKey2,
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)
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}
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// MsgType returns the integer uniquely identifying this message type on the
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// wire.
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//
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// This is part of the lnwire.Message interface.
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func (a *ChannelAnnouncement) MsgType() MessageType {
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return MsgChannelAnnouncement
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}
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// MaxPayloadLength returns the maximum allowed payload size for this message
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// observing the specified protocol version.
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//
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// This is part of the lnwire.Message interface.
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func (a *ChannelAnnouncement) MaxPayloadLength(pver uint32) uint32 {
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var length uint32
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// NodeSig1 - 64 bytes
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length += 64
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// NodeSig2 - 64 bytes
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length += 64
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// ShortChannelID - 8 bytes
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length += 8
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// BitcoinSig1 - 64 bytes
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length += 64
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// BitcoinSig2 - 64 bytes
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length += 64
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// NodeID1 - 33 bytes
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length += 33
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// NodeID2 - 33 bytes
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length += 33
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// BitcoinKey1 - 33 bytes
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length += 33
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// BitcoinKey2 - 33 bytes
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length += 33
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return length
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}
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// DataToSign is used to retrieve part of the announcement message which
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// should be signed.
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func (a *ChannelAnnouncement) DataToSign() ([]byte, error) {
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// We should not include the signatures itself.
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var w bytes.Buffer
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err := writeElements(&w,
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a.ShortChannelID,
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a.NodeID1,
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a.NodeID2,
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a.BitcoinKey1,
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a.BitcoinKey2,
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)
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if err != nil {
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return nil, err
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}
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return w.Bytes(), nil
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}
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