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82 lines
2.3 KiB
Go
82 lines
2.3 KiB
Go
// Copyright (c) 2017 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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// MaxGetCFiltersReqRange the maximum number of filters that may be requested in
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// a getcfheaders message.
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const MaxGetCFiltersReqRange = 1000
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// MsgGetCFilters implements the Message interface and represents a bitcoin
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// getcfilters message. It is used to request committed filters for a range of
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// blocks.
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type MsgGetCFilters struct {
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FilterType FilterType
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StartHeight uint32
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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 *MsgGetCFilters) 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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err = readElement(r, &msg.StartHeight)
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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 *MsgGetCFilters) 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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err = writeElement(w, &msg.StartHeight)
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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 *MsgGetCFilters) Command() string {
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return CmdGetCFilters
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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 *MsgGetCFilters) MaxPayloadLength(pver uint32) uint32 {
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// Filter type + uint32 + block hash
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return 1 + 4 + chainhash.HashSize
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}
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// NewMsgGetCFilters returns a new bitcoin getcfilters message that conforms to
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// the Message interface using the passed parameters and defaults for the
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// remaining fields.
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func NewMsgGetCFilters(filterType FilterType, startHeight uint32,
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stopHash *chainhash.Hash) *MsgGetCFilters {
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return &MsgGetCFilters{
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FilterType: filterType,
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StartHeight: startHeight,
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StopHash: *stopHash,
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}
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}
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