6dcefac868
With this commit a revocation message now carries 3 items: 1. A pre-image revoking the lowest unrevoked commitment transaction in the commitment chain. 2. A new key which extends the current revocation window by 1. This key is to be used for new commitment transactions. 3. A new hash which also extends the current revocation window by 1. This hash is to be used for new HTLC revocation hashes.
136 lines
3.9 KiB
Go
136 lines
3.9 KiB
Go
package lnwire
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import (
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"fmt"
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"github.com/roasbeef/btcd/btcec"
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"github.com/roasbeef/btcd/wire"
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"github.com/roasbeef/btcutil"
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"io"
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)
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// CloseRequest is sent by either side in order to initiate the cooperative
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// closure of a channel. This message is rather sparse as both side implicitly
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// know to craft a transaction sending the settled funds of both parties to the
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// final delivery addresses negotiated during the funding workflow.
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//
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// NOTE: The requester is able to only send a signature to initiate the
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// cooperative channel closure as all transactions are assembled observing
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// BIP 69 which defines a cannonical ordering for input/outputs. Therefore,
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// both sides are able to arrive at an identical closure transaction as they
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// know the order of the inputs/outputs.
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type CloseRequest struct {
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// ChannelPoint serves to identify which channel is to be closed.
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ChannelPoint *wire.OutPoint
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// RequesterCloseSig is the signature of the requester for the fully
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// assembled closing transaction.
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RequesterCloseSig *btcec.Signature
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// Fee is the required fee-per-KB the closing transaction must have.
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// It is recommended that a "sufficient" fee be paid in order to achieve
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// timely channel closure.
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// TODO(roasbeef): if initiator always pays fees, then no longer needed.
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Fee btcutil.Amount
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}
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// NewCloseRequest creates a new CloseRequest.
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func NewCloseRequest(cp *wire.OutPoint, sig *btcec.Signature) *CloseRequest {
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// TODO(roasbeef): update once fees aren't hardcoded
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return &CloseRequest{
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ChannelPoint: cp,
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RequesterCloseSig: sig,
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}
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}
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// A compile time check to ensure CloseRequest implements the lnwire.Message
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// interface.
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var _ Message = (*CloseRequest)(nil)
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// Decode deserializes a serialized CloseRequest stored in the passed io.Reader
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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 (c *CloseRequest) Decode(r io.Reader, pver uint32) error {
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// ChannelPoint (8)
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// RequesterCloseSig (73)
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// First byte length then sig
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// Fee (8)
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err := readElements(r,
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&c.ChannelPoint,
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&c.RequesterCloseSig,
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&c.Fee)
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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 CloseRequest into the passed io.Writer observing
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// 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 *CloseRequest) Encode(w io.Writer, pver uint32) error {
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// ChannelID
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// RequesterCloseSig
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// Fee
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err := writeElements(w,
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c.ChannelPoint,
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c.RequesterCloseSig,
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c.Fee)
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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 *CloseRequest) Command() uint32 {
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return CmdCloseRequest
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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 (c *CloseRequest) MaxPayloadLength(pver uint32) uint32 {
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// 36 + 73 + 8
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return 117
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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 CloseRequest are valid.
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//
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// This is part of the lnwire.Message interface.
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func (c *CloseRequest) Validate() error {
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// Fee must be greater than 0.
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if c.Fee < 0 {
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return fmt.Errorf("Fee must be greater than zero.")
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}
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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 CloseRequest.
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//
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// This is part of the lnwire.Message interface.
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func (c *CloseRequest) String() string {
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var serializedSig []byte
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if c.RequesterCloseSig != nil && c.RequesterCloseSig.R != nil {
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serializedSig = c.RequesterCloseSig.Serialize()
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}
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return fmt.Sprintf("\n--- Begin CloseRequest ---\n") +
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fmt.Sprintf("ChannelPoint:\t\t%v\n", c.ChannelPoint) +
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fmt.Sprintf("CloseSig\t\t%x\n", serializedSig) +
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fmt.Sprintf("Fee:\t\t\t%d\n", c.Fee) +
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fmt.Sprintf("--- End CloseRequest ---\n")
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}
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