81 lines
2.2 KiB
Go
81 lines
2.2 KiB
Go
// Copyright (c) 2013-2014 Conformal Systems LLC.
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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 btcwire
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import (
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"io"
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)
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// MsgAlert implements the Message interface and defines a bitcoin alert
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// message.
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//
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// This is a signed message that provides notifications that the client should
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// display if the signature matches the key. bitcoind/bitcoin-qt only checks
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// against a signature from the core developers.
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type MsgAlert struct {
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// PayloadBlob is the alert payload serialized as a string so that the
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// version can change but the Alert can still be passed on by older
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// clients.
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PayloadBlob string
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// Signature is the ECDSA signature of the message.
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Signature string
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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 *MsgAlert) BtcDecode(r io.Reader, pver uint32) error {
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var err error
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msg.PayloadBlob, err = readVarString(r, pver)
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if err != nil {
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return err
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}
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msg.Signature, err = readVarString(r, pver)
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if err != nil {
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return err
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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 *MsgAlert) BtcEncode(w io.Writer, pver uint32) error {
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var err error
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err = writeVarString(w, pver, msg.PayloadBlob)
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if err != nil {
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return err
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}
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err = writeVarString(w, pver, msg.Signature)
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if err != nil {
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return err
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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 *MsgAlert) Command() string {
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return cmdAlert
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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 *MsgAlert) MaxPayloadLength(pver uint32) uint32 {
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// Since this can vary depending on the message, make it the max
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// size allowed.
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return maxMessagePayload
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}
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// NewMsgAlert returns a new bitcoin alert message that conforms to the Message
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// interface. See MsgAlert for details.
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func NewMsgAlert(payloadblob string, signature string) *MsgAlert {
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return &MsgAlert{
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PayloadBlob: payloadblob,
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Signature: signature,
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}
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}
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