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update_fee.go
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update_fee.go
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package lnwire
import (
"bytes"
"io"
)
// UpdateFee is the message the channel initiator sends to the other peer if
// the channel commitment fee needs to be updated.
type UpdateFee struct {
// ChanID is the channel that this UpdateFee is meant for.
ChanID ChannelID
// FeePerKw is the fee-per-kw on commit transactions that the sender of
// this message wants to use for this channel.
//
// TODO(halseth): make SatPerKWeight when fee estimation is moved to
// own package. Currently this will cause an import cycle.
FeePerKw uint32
// ExtraData is the set of data that was appended to this message to
// fill out the full maximum transport message size. These fields can
// be used to specify optional data such as custom TLV fields.
ExtraData ExtraOpaqueData
}
// NewUpdateFee creates a new UpdateFee message.
func NewUpdateFee(chanID ChannelID, feePerKw uint32) *UpdateFee {
return &UpdateFee{
ChanID: chanID,
FeePerKw: feePerKw,
}
}
// A compile time check to ensure UpdateFee implements the lnwire.Message
// interface.
var _ Message = (*UpdateFee)(nil)
// Decode deserializes a serialized UpdateFee message stored in the passed
// io.Reader observing the specified protocol version.
//
// This is part of the lnwire.Message interface.
func (c *UpdateFee) Decode(r io.Reader, pver uint32) error {
return ReadElements(r,
&c.ChanID,
&c.FeePerKw,
&c.ExtraData,
)
}
// Encode serializes the target UpdateFee into the passed io.Writer
// observing the protocol version specified.
//
// This is part of the lnwire.Message interface.
func (c *UpdateFee) Encode(w *bytes.Buffer, pver uint32) error {
if err := WriteChannelID(w, c.ChanID); err != nil {
return err
}
if err := WriteUint32(w, c.FeePerKw); err != nil {
return err
}
return WriteBytes(w, c.ExtraData)
}
// MsgType returns the integer uniquely identifying this message type on the
// wire.
//
// This is part of the lnwire.Message interface.
func (c *UpdateFee) MsgType() MessageType {
return MsgUpdateFee
}
// TargetChanID returns the channel id of the link for which this message is
// intended.
//
// NOTE: Part of peer.LinkUpdater interface.
func (c *UpdateFee) TargetChanID() ChannelID {
return c.ChanID
}