func messageToHex(msg wire.Message) (string, error) {
	var buf bytes.Buffer
	if err := msg.BtcEncode(&buf, 70002); err != nil {
		return "", fmt.Errorf(fmt.Sprintf("Failed to encode msg of type %T", msg))
	}
	return hex.EncodeToString(buf.Bytes()), nil
}

// messageSummary returns a human-readable string which summarizes a message.
// Not all messages have or need a summary.  This is used for debug logging.
func messageSummary(msg wire.Message) string {
	switch msg := msg.(type) {
	case *wire.MsgVersion:
		return fmt.Sprintf("agent %s, pver %d, block %d",
			msg.UserAgent, msg.ProtocolVersion, msg.LastBlock)

	case *wire.MsgVerAck:
		// No summary.

	case *wire.MsgGetAddr:
		// No summary.

	case *wire.MsgAddr:
		return fmt.Sprintf("%d addr", len(msg.AddrList))

	case *wire.MsgPing:
		// No summary - perhaps add nonce.

	case *wire.MsgPong:
		// No summary - perhaps add nonce.

	case *wire.MsgAlert:
		// No summary.

	case *wire.MsgMemPool:
		// No summary.

	case *wire.MsgTx:
		hash, _ := msg.TxSha()
		return fmt.Sprintf("hash %s, %d inputs, %d outputs, lock %s",
			hash, len(msg.TxIn), len(msg.TxOut),
			formatLockTime(msg.LockTime))

	case *wire.MsgBlock:
		header := &msg.Header
		hash, _ := msg.BlockSha()
		return fmt.Sprintf("hash %s, ver %d, %d tx, %s", hash,
			header.Version, len(msg.Transactions), header.Timestamp)

	case *wire.MsgInv:
		return invSummary(msg.InvList)

	case *wire.MsgNotFound:
		return invSummary(msg.InvList)

	case *wire.MsgGetData:
		return invSummary(msg.InvList)

	case *wire.MsgGetBlocks:
		return locatorSummary(msg.BlockLocatorHashes, &msg.HashStop)

	case *wire.MsgGetHeaders:
		return locatorSummary(msg.BlockLocatorHashes, &msg.HashStop)

	case *wire.MsgHeaders:
		return fmt.Sprintf("num %d", len(msg.Headers))

	case *wire.MsgReject:
		// Ensure the variable length strings don't contain any
		// characters which are even remotely dangerous such as HTML
		// control characters, etc.  Also limit them to sane length for
		// logging.
		rejCommand := sanitizeString(msg.Cmd, wire.CommandSize)
		rejReason := sanitizeString(msg.Reason, maxRejectReasonLen)
		summary := fmt.Sprintf("cmd %v, code %v, reason %v", rejCommand,
			msg.Code, rejReason)
		if rejCommand == wire.CmdBlock || rejCommand == wire.CmdTx {
			summary += fmt.Sprintf(", hash %v", msg.Hash)
		}
		return summary
	}

	// No summary for other messages.
	return ""
}