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