lnd.xprv/lnwire/close_request.go

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package lnwire
import (
"fmt"
"github.com/roasbeef/btcd/btcec"
"github.com/roasbeef/btcd/wire"
"github.com/roasbeef/btcutil"
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"io"
)
// CloseRequest is sent by either side in order to initiate the cooperative
// closure of a channel. This message is rather sparse as both side implicitly
// know to craft a transaction sending the settled funds of both parties to the
// final delivery addresses negotiated during the funding workflow.
//
// NOTE: The requester is able to only send a signature to initiate the
// cooperative channel closure as all transactions are assembled observing
// BIP 69 which defines a cannonical ordering for input/outputs. Therefore,
// both sides are able to arrive at an identical closure transaction as they
// know the order of the inputs/outputs.
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type CloseRequest struct {
// ChannelPoint serves to identify which channel is to be closed.
ChannelPoint *wire.OutPoint
// RequesterCloseSig is the signature of the requester for the fully
// assembled closing transaction.
RequesterCloseSig *btcec.Signature
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// Fee is the required fee-per-KB the closing transaction must have.
// It is recommended that a "sufficient" fee be paid in order to achieve
// timely channel closure.
// TODO(roasbeef): if initiator always pays fees, then no longer needed.
Fee btcutil.Amount
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}
// NewCloseRequest creates a new CloseRequest.
func NewCloseRequest(cp *wire.OutPoint, sig *btcec.Signature) *CloseRequest {
// TODO(roasbeef): update once fees aren't hardcoded
return &CloseRequest{
ChannelPoint: cp,
RequesterCloseSig: sig,
}
}
// A compile time check to ensure CloseRequest implements the lnwire.Message
// interface.
var _ Message = (*CloseRequest)(nil)
// Decode deserializes a serialized CloseRequest stored in the passed io.Reader
// observing the specified protocol version.
//
// This is part of the lnwire.Message interface.
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func (c *CloseRequest) Decode(r io.Reader, pver uint32) error {
// ChannelPoint (8)
// RequesterCloseSig (73)
// First byte length then sig
// Fee (8)
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err := readElements(r,
&c.ChannelPoint,
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&c.RequesterCloseSig,
&c.Fee)
if err != nil {
return err
}
return nil
}
// Encode serializes the target CloseRequest into the passed io.Writer observing
// the protocol version specified.
//
// This is part of the lnwire.Message interface.
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func (c *CloseRequest) Encode(w io.Writer, pver uint32) error {
// ChannelID
// RequesterCloseSig
// Fee
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err := writeElements(w,
c.ChannelPoint,
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c.RequesterCloseSig,
c.Fee)
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.
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func (c *CloseRequest) Command() uint32 {
return CmdCloseRequest
}
// MaxPayloadLength returns the maximum allowed payload size for this message
// observing the specified protocol version.
//
// This is part of the lnwire.Message interface.
func (c *CloseRequest) MaxPayloadLength(pver uint32) uint32 {
// 36 + 73 + 8
return 117
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}
// Validate performs any necessary sanity checks to ensure all fields present
// on the CloseRequest are valid.
//
// This is part of the lnwire.Message interface.
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func (c *CloseRequest) Validate() error {
// Fee must be greater than 0.
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if c.Fee < 0 {
return fmt.Errorf("Fee must be greater than zero.")
}
// We're good!
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return nil
}
// String returns the string representation of the target CloseRequest.
//
// This is part of the lnwire.Message interface.
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func (c *CloseRequest) String() string {
var serializedSig []byte
if c.RequesterCloseSig != nil && c.RequesterCloseSig.R != nil {
serializedSig = c.RequesterCloseSig.Serialize()
}
return fmt.Sprintf("\n--- Begin CloseRequest ---\n") +
fmt.Sprintf("ChannelPoint:\t\t%v\n", c.ChannelPoint) +
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fmt.Sprintf("CloseSig\t\t%x\n", serializedSig) +
fmt.Sprintf("Fee:\t\t\t%d\n", c.Fee) +
fmt.Sprintf("--- End CloseRequest ---\n")
}