139 lines
4.6 KiB
Go
139 lines
4.6 KiB
Go
package lnwire
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import (
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"fmt"
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"io"
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"github.com/roasbeef/btcd/btcec"
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"github.com/roasbeef/btcd/wire"
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)
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// CommitRevocation is sent by either side once a CommitSignature message has
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// been received, and validated. This message serves to revoke the prior
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// commitment transaction, which was the most up to date version until a
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// CommitSignature message referencing the specified ChannelPoint was received.
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// Additionally, this message also piggyback's the next revocation hash that
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// Alice should use when constructing the Bob's version of the next commitment
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// transaction (which would be done before sending a CommitSignature message).
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// This piggybacking allows Alice to send the next CommitSignature message
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// modifying Bob's commitment transaction without first asking for a revocation
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// hash initially.
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// TODO(roasbeef): update docs everywhere
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type CommitRevocation struct {
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// ChannelPoint uniquely identifies to which currently active channel this
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// CommitRevocation applies to.
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ChannelPoint *wire.OutPoint
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// Revocation is the pre-image to the revocation hash of the now prior
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// commitment transaction.
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//
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// If the received revocation is the all zeroes hash ('0' * 32), then
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// this CommitRevocation is being sent in order to build up the
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// sender's initial revocation window (IRW). In this case, the
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// CommitRevocation should be added to the receiver's queue of unused
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// revocations to be used to construct future commitment transactions.
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Revocation [32]byte
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// NextRevocationKey is the next revocation key which should be added
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// to the queue of unused revocation keys for the remote peer. This key
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// will be used within the revocation clause for any new commitment
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// transactions created for the remote peer.
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NextRevocationKey *btcec.PublicKey
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// NextRevocationHash is the next revocation hash which should be added
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// to the queue on unused revocation hashes for the remote peer. This
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// revocation hash will be used within any HTLC's included within this
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// next commitment transaction.
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NextRevocationHash [32]byte
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}
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// NewCommitRevocation creates a new CommitRevocation message.
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func NewCommitRevocation() *CommitRevocation {
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return &CommitRevocation{}
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}
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// A compile time check to ensure CommitRevocation implements the lnwire.Message
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// interface.
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var _ Message = (*CommitRevocation)(nil)
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// Decode deserializes a serialized CommitRevocation message stored in the
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// passed 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 (c *CommitRevocation) Decode(r io.Reader, pver uint32) error {
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// ChannelPoint (8)
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// Revocation (32)
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// NextRevocationKey (33)
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// NextRevocationHash (32)
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err := readElements(r,
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&c.ChannelPoint,
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&c.Revocation,
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&c.NextRevocationKey,
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&c.NextRevocationHash,
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)
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if err != nil {
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return err
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}
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return nil
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}
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// Encode serializes the target CommitRevocation 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 (c *CommitRevocation) Encode(w io.Writer, pver uint32) error {
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err := writeElements(w,
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c.ChannelPoint,
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c.Revocation,
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c.NextRevocationKey,
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c.NextRevocationHash,
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)
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if err != nil {
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return err
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}
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return nil
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}
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// Command 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 (c *CommitRevocation) Command() uint32 {
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return CmdCommitRevocation
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}
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// MaxPayloadLength returns the maximum allowed payload size for a
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// CommitRevocation complete message 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 (c *CommitRevocation) MaxPayloadLength(uint32) uint32 {
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// 36 + 32 + 33 + 32
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return 133
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}
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// Validate performs any necessary sanity checks to ensure all fields present
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// on the CommitRevocation are valid.
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//
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// This is part of the lnwire.Message interface.
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func (c *CommitRevocation) Validate() error {
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// We're good!
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return nil
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}
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// String returns the string representation of the target CommitRevocation.
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//
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// This is part of the lnwire.Message interface.
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// TODO(roasbeef): remote all String() methods...spew should be used instead.
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func (c *CommitRevocation) String() string {
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keySer := c.NextRevocationKey.SerializeCompressed()
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return fmt.Sprintf("\n--- Begin CommitRevocation ---\n") +
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fmt.Sprintf("ChannelPoint:\t%v\n", c.ChannelPoint) +
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fmt.Sprintf("Revocation:\t%x\n", c.Revocation) +
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fmt.Sprintf("NextRevocationKey:\t%x\n", keySer) +
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fmt.Sprintf("NextRevocationHash:\t%x\n", c.NextRevocationHash) +
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fmt.Sprintf("--- End CommitRevocation ---\n")
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}
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