lnd.xprv/lnwire/htlc_settlerequest.go

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package lnwire
import (
"fmt"
"io"
"github.com/roasbeef/btcd/wire"
)
// HTLCSettleRequest is sent by Alice to Bob when she wishes to settle a
// particular HTLC referenced by its HTLCKey within a specific active channel
// referenced by ChannelPoint. The message allows multiple hash preimages to be
// presented in order to support N-of-M HTLC contracts. A subsequent
// CommitSignature message will be sent by Alice to "lock-in" the removal of the
// specified HTLC, possible containing a batch signature covering several settled
// HTLC's.
type HTLCSettleRequest struct {
// ChannelPoint references an active channel which holds the HTLC to be
// settled.
ChannelPoint *wire.OutPoint
// HTLCKey denotes the exact HTLC stage within the receiving node's
// commitment transaction to be removed.
// TODO(roasbeef): rename to LogIndex
HTLCKey HTLCKey
// RedemptionProofs are the R-value preimages required to fully settle
// an HTLC. The number of preimages in the slice will depend on the
// specific ContractType of the referenced HTLC.
RedemptionProofs [][32]byte
}
// NewHTLCSettleRequest returns a new empty HTLCSettleRequest.
func NewHTLCSettleRequest(chanPoint *wire.OutPoint, key HTLCKey,
redemptionProofs [][32]byte) *HTLCSettleRequest {
return &HTLCSettleRequest{
ChannelPoint: chanPoint,
HTLCKey: key,
RedemptionProofs: redemptionProofs,
}
}
// A compile time check to ensure HTLCSettleRequest implements the lnwire.Message
// interface.
var _ Message = (*HTLCSettleRequest)(nil)
// Decode deserializes a serialized HTLCSettleRequest message stored in the passed
// io.Reader observing the specified protocol version.
//
// This is part of the lnwire.Message interface.
func (c *HTLCSettleRequest) Decode(r io.Reader, pver uint32) error {
// ChannelPoint(8)
// HTLCKey(8)
// RedemptionProofs(N*32)
err := readElements(r,
&c.ChannelPoint,
&c.HTLCKey,
&c.RedemptionProofs,
)
if err != nil {
return err
}
return nil
}
// Encode serializes the target HTLCSettleRequest into the passed io.Writer
// observing the protocol version specified.
//
// This is part of the lnwire.Message interface.
func (c *HTLCSettleRequest) Encode(w io.Writer, pver uint32) error {
err := writeElements(w,
c.ChannelPoint,
c.HTLCKey,
c.RedemptionProofs,
)
if err != nil {
return err
}
return nil
}
// Command returns the integer uniquely identifying this message type on the
// wire.
//
// This is part of the lnwire.Message interface.
func (c *HTLCSettleRequest) Command() uint32 {
return CmdHTLCSettleRequest
}
// MaxPayloadLength returns the maximum allowed payload size for a HTLCSettleRequest
// complete message observing the specified protocol version.
//
// This is part of the lnwire.Message interface.
func (c *HTLCSettleRequest) MaxPayloadLength(uint32) uint32 {
// 36 + 8 + (32 * 15)
return 524
}
// Validate performs any necessary sanity checks to ensure all fields present
// on the HTLCSettleRequest are valid.
//
// This is part of the lnwire.Message interface.
func (c *HTLCSettleRequest) Validate() error {
// We're good!
return nil
}
// String returns the string representation of the target HTLCSettleRequest.
//
// This is part of the lnwire.Message interface.
func (c *HTLCSettleRequest) String() string {
var redemptionProofs string
for i, rh := range c.RedemptionProofs {
redemptionProofs += fmt.Sprintf("\n\tSlice\t%d\n", i)
redemptionProofs += fmt.Sprintf("\t\tRedemption Proof: %x\n", rh)
}
return fmt.Sprintf("\n--- Begin HTLCSettleRequest ---\n") +
fmt.Sprintf("ChannelPoint:\t%v\n", c.ChannelPoint) +
fmt.Sprintf("HTLCKey:\t%d\n", c.HTLCKey) +
fmt.Sprintf("RedemptionHashes:") +
redemptionProofs +
fmt.Sprintf("--- End HTLCSettleRequest ---\n")
}