lbcd/msgalert.go

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2013-05-08 21:31:00 +02:00
// Copyright (c) 2013 Conformal Systems LLC.
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package btcwire
import (
"io"
)
// MsgAlert implements the Message interface and defines a bitcoin alert
// message.
//
// This is a signed message that provides notifications that the client should
// display if the signature matches the key. bitcoind/bitcoin-qt only checks
// against a signature from the core developers.
type MsgAlert struct {
// PayloadBlob is the alert payload serialized as a string so that the
// version can change but the Alert can still be passed on by older
// clients.
PayloadBlob string
// Signature is the ECDSA signature of the message.
Signature string
}
// BtcDecode decodes r using the bitcoin protocol encoding into the receiver.
// This is part of the Message interface implementation.
func (msg *MsgAlert) BtcDecode(r io.Reader, pver uint32) error {
var err error
msg.PayloadBlob, err = readVarString(r, pver)
if err != nil {
return err
}
msg.Signature, err = readVarString(r, pver)
if err != nil {
return err
}
return nil
}
// BtcEncode encodes the receiver to w using the bitcoin protocol encoding.
// This is part of the Message interface implementation.
func (msg *MsgAlert) BtcEncode(w io.Writer, pver uint32) error {
var err error
err = writeVarString(w, pver, msg.PayloadBlob)
if err != nil {
return err
}
err = writeVarString(w, pver, msg.Signature)
if err != nil {
return err
}
return nil
}
// Command returns the protocol command string for the message. This is part
// of the Message interface implementation.
func (msg *MsgAlert) Command() string {
return cmdAlert
}
// MaxPayloadLength returns the maximum length the payload can be for the
// receiver. This is part of the Message interface implementation.
func (msg *MsgAlert) MaxPayloadLength(pver uint32) uint32 {
// Since this can vary depending on the message, make it the max
// size allowed.
return maxMessagePayload
}
// NewMsgAlert returns a new bitcoin alert message that conforms to the Message
// interface. See MsgAlert for details.
func NewMsgAlert(payloadblob string, signature string) *MsgAlert {
return &MsgAlert{
PayloadBlob: payloadblob,
Signature: signature,
}
}