105 lines
2.7 KiB
Go
105 lines
2.7 KiB
Go
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package lnwire
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import (
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"io"
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"github.com/roasbeef/btcd/wire"
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)
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// UpdateFufillHTLC is sent by Alice to Bob when she wishes to settle a
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// particular HTLC referenced by its HTLCKey within a specific active channel
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// referenced by ChannelPoint. A subsequent CommitSig message will be sent by
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// Alice to "lock-in" the removal of the specified HTLC, possible containing a
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// batch signature covering several settled HTLC's.
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type UpdateFufillHTLC struct {
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// ChannelPoint references an active channel which holds the HTLC to be
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// settled.
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ChannelPoint wire.OutPoint
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// ID denotes the exact HTLC stage within the receiving node's
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// commitment transaction to be removed.
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ID uint64
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// PaymentPreimage is the R-value preimage required to fully settle an
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// HTLC.
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PaymentPreimage [32]byte
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}
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// NewUpdateFufillHTLC returns a new empty UpdateFufillHTLC.
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func NewUpdateFufillHTLC(chanPoint wire.OutPoint, id uint64,
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preimage [32]byte) *UpdateFufillHTLC {
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return &UpdateFufillHTLC{
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ChannelPoint: chanPoint,
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ID: id,
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PaymentPreimage: preimage,
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}
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}
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// A compile time check to ensure UpdateFufillHTLC implements the lnwire.Message
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// interface.
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var _ Message = (*UpdateFufillHTLC)(nil)
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// Decode deserializes a serialized UpdateFufillHTLC message 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 (c *UpdateFufillHTLC) Decode(r io.Reader, pver uint32) error {
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// ChannelPoint(8)
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// ID(8)
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// PaymentPreimage(32)
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err := readElements(r,
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&c.ChannelPoint,
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&c.ID,
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c.PaymentPreimage[:],
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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 UpdateFufillHTLC 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 *UpdateFufillHTLC) 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.ID,
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c.PaymentPreimage[:],
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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 *UpdateFufillHTLC) Command() uint32 {
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return CmdUpdateFufillHTLC
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}
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// MaxPayloadLength returns the maximum allowed payload size for a UpdateFufillHTLC
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// 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 *UpdateFufillHTLC) MaxPayloadLength(uint32) uint32 {
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// 36 + 8 + (32 * 15)
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return 524
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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 UpdateFufillHTLC are valid.
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//
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// This is part of the lnwire.Message interface.
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func (c *UpdateFufillHTLC) Validate() error {
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// We're good!
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return nil
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}
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