79 lines
2.4 KiB
Go
79 lines
2.4 KiB
Go
// Copyright (c) 2013-2015 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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// MsgPong implements the Message interface and represents a bitcoin pong
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// message which is used primarily to confirm that a connection is still valid
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// in response to a bitcoin ping message (MsgPing).
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//
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// This message was not added until protocol versions AFTER BIP0031Version.
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type MsgPong struct {
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// Unique value associated with message that is used to identify
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// specific ping message.
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Nonce uint64
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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 *MsgPong) BtcDecode(r io.Reader, pver uint32, enc MessageEncoding) error {
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// NOTE: <= is not a mistake here. The BIP0031 was defined as AFTER
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// the version unlike most others.
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if pver <= BIP0031Version {
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str := fmt.Sprintf("pong message invalid for protocol "+
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"version %d", pver)
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return messageError("MsgPong.BtcDecode", str)
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}
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return readElement(r, &msg.Nonce)
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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 *MsgPong) BtcEncode(w io.Writer, pver uint32, enc MessageEncoding) error {
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// NOTE: <= is not a mistake here. The BIP0031 was defined as AFTER
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// the version unlike most others.
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if pver <= BIP0031Version {
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str := fmt.Sprintf("pong message invalid for protocol "+
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"version %d", pver)
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return messageError("MsgPong.BtcEncode", str)
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}
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return writeElement(w, msg.Nonce)
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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 *MsgPong) Command() string {
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return CmdPong
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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 *MsgPong) MaxPayloadLength(pver uint32) uint32 {
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plen := uint32(0)
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// The pong message did not exist for BIP0031Version and earlier.
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// NOTE: > is not a mistake here. The BIP0031 was defined as AFTER
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// the version unlike most others.
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if pver > BIP0031Version {
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// Nonce 8 bytes.
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plen += 8
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}
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return plen
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}
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// NewMsgPong returns a new bitcoin pong message that conforms to the Message
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// interface. See MsgPong for details.
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func NewMsgPong(nonce uint64) *MsgPong {
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return &MsgPong{
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Nonce: nonce,
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}
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}
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