ae00fff14a
This implements the wire protocol encoding portion of a new sendheaders message as described by BIP0130. It purpose is to request that a peer sends header commands instead of inv commands when announcing new blocks. This includes a protocol version bump to 70012 and a wire version bump to 0.4.0. Note that this does not implement logic to handle the command in btcd, rather it only makes the command available at the wire protocol level. A future commit which honors the command and therefore provides full BIP0130 support is still required.
60 lines
1.9 KiB
Go
60 lines
1.9 KiB
Go
// Copyright (c) 2016 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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"fmt"
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"io"
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)
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// MsgSendHeaders implements the Message interface and represents a bitcoin
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// sendheaders message. It is used to request the peer send block headers
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// rather than inventory vectors.
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//
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// This message has no payload and was not added until protocol versions
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// starting with SendHeadersVersion.
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type MsgSendHeaders struct{}
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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 *MsgSendHeaders) BtcDecode(r io.Reader, pver uint32) error {
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if pver < SendHeadersVersion {
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str := fmt.Sprintf("sendheaders message invalid for protocol "+
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"version %d", pver)
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return messageError("MsgSendHeaders.BtcDecode", str)
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}
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return nil
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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 *MsgSendHeaders) BtcEncode(w io.Writer, pver uint32) error {
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if pver < SendHeadersVersion {
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str := fmt.Sprintf("sendheaders message invalid for protocol "+
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"version %d", pver)
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return messageError("MsgSendHeaders.BtcEncode", str)
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}
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return nil
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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 *MsgSendHeaders) Command() string {
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return CmdSendHeaders
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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 *MsgSendHeaders) MaxPayloadLength(pver uint32) uint32 {
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return 0
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}
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// NewMsgSendHeaders returns a new bitcoin sendheaders message that conforms to
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// the Message interface. See MsgSendHeaders for details.
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func NewMsgSendHeaders() *MsgSendHeaders {
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return &MsgSendHeaders{}
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}
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