514760f529
This commit changes the cooperative channel close workflow to comply with the latest spec. This adds steps to handle and send shutdown messages as well as moving responsibility for sending the channel close message from the initiator to the responder.
82 lines
2.3 KiB
Go
82 lines
2.3 KiB
Go
package lnwire
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import (
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"io"
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)
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// Shutdown is sent by either side in order to initiate the cooperative closure
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// of a channel. This message is sparse as both sides implicitly have the
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// information necessary to construct a transaction that will send the settled
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// funds of both parties to the final delivery addresses negotiated during the
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// funding workflow.
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type Shutdown struct {
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// ChannelID serves to identify which channel is to be closed.
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ChannelID ChannelID
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// Address is the script to which the channel funds will be paid.
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Address DeliveryAddress
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}
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// DeliveryAddress is used to communicate the address to which funds from a
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// closed channel should be sent. The address can be a p2wsh, p2pkh, p2sh or
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// p2wpkh.
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type DeliveryAddress []byte
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// NewShutdown creates a new Shutdown message.
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func NewShutdown(cid ChannelID, addr DeliveryAddress) *Shutdown {
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return &Shutdown{
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ChannelID: cid,
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Address: addr,
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}
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}
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// A compile-time check to ensure Shutdown implements the lnwire.Message
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// interface.
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var _ Message = (*Shutdown)(nil)
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// Decode deserializes a serialized Shutdown 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 (s *Shutdown) Decode(r io.Reader, pver uint32) error {
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return readElements(r, &s.ChannelID, &s.Address)
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}
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// Encode serializes the target Shutdown 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 (s *Shutdown) Encode(w io.Writer, pver uint32) error {
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return writeElements(w, s.ChannelID, s.Address)
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}
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// MsgType 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 (s *Shutdown) MsgType() MessageType {
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return MsgShutdown
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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 (s *Shutdown) MaxPayloadLength(pver uint32) uint32 {
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var length uint32
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// ChannelID - 32bytes
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length += 32
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// Len - 2 bytes
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length += 2
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// ScriptPubKey - 34 bytes for pay to witness script hash
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length += 34
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// NOTE: pay to pubkey hash is 25 bytes, pay to script hash is 22
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// bytes, and pay to witness pubkey hash is 22 bytes in length.
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return length
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}
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