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msggetcfcheckpt.go
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msggetcfcheckpt.go
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// Copyright (c) 2018 The btcsuite developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package wire
import (
"io"
"github.com/utreexo/utreexod/chaincfg/chainhash"
)
// MsgGetCFCheckpt is a request for filter headers at evenly spaced intervals
// throughout the blockchain history. It allows to set the FilterType field to
// get headers in the chain of basic (0x00) or extended (0x01) headers.
type MsgGetCFCheckpt struct {
FilterType FilterType
StopHash chainhash.Hash
}
// BtcDecode decodes r using the bitcoin protocol encoding into the receiver.
// This is part of the Message interface implementation.
func (msg *MsgGetCFCheckpt) BtcDecode(r io.Reader, pver uint32, _ MessageEncoding) error {
err := readElement(r, &msg.FilterType)
if err != nil {
return err
}
return readElement(r, &msg.StopHash)
}
// BtcEncode encodes the receiver to w using the bitcoin protocol encoding.
// This is part of the Message interface implementation.
func (msg *MsgGetCFCheckpt) BtcEncode(w io.Writer, pver uint32, _ MessageEncoding) error {
err := writeElement(w, msg.FilterType)
if err != nil {
return err
}
return writeElement(w, &msg.StopHash)
}
// Command returns the protocol command string for the message. This is part
// of the Message interface implementation.
func (msg *MsgGetCFCheckpt) Command() string {
return CmdGetCFCheckpt
}
// MaxPayloadLength returns the maximum length the payload can be for the
// receiver. This is part of the Message interface implementation.
func (msg *MsgGetCFCheckpt) MaxPayloadLength(pver uint32) uint32 {
// Filter type + uint32 + block hash
return 1 + chainhash.HashSize
}
// NewMsgGetCFCheckpt returns a new bitcoin getcfcheckpt message that conforms
// to the Message interface using the passed parameters and defaults for the
// remaining fields.
func NewMsgGetCFCheckpt(filterType FilterType, stopHash *chainhash.Hash) *MsgGetCFCheckpt {
return &MsgGetCFCheckpt{
FilterType: filterType,
StopHash: *stopHash,
}
}