How to use the fabric-protos.token function in fabric-protos

logger.debug('sendTokenCommandToPeer - Start');

	let targets = peers;
	if (!Array.isArray(peers)) {
		targets = [peers];
	}

	let commandResponse = null;
	let error = null;

	for (const peer of targets) {
		try {
			// send to one peer, if peer returns response, check error and return
			logger.debug('calling sendTokenCommand for peer %s', peer.getUrl());
			const signedCommandResponse = await peer.sendTokenCommand(signedCommand, timeout);
			commandResponse = fabprotos.token.CommandResponse.decode(signedCommandResponse.response);
			logger.debug('received command response: %s', commandResponse);
		} catch (err) {
			// peer didn't return response, so loop back to next peer
			error = err;
			logger.error('caught error when sending token command to peer (%s): %s', peer.getUrl(), error);
		}

		if (commandResponse !== null) {
			if (!commandResponse.get('err')) {
				return commandResponse;
			} else {
				logger.error('command response has error: %s', commandResponse.get('err').getMessage());
				throw new Error(util.format('command response has error: %s', commandResponse.get('err').getMessage()));
			}
		}
	}

module.exports.buildListCommand = () => {
	logger.debug('buildListCommand - Start');

	// construct list request and token command
	const listRequest = new fabprotos.token.ListRequest();
	const tokenCmd = new fabprotos.token.Command();
	tokenCmd.set('list_request', listRequest);

	return tokenCmd;
};

module.exports.buildListCommand = () => {
	logger.debug('buildListCommand - Start');

	// construct list request and token command
	const listRequest = new fabprotos.token.ListRequest();
	const tokenCmd = new fabprotos.token.Command();
	tokenCmd.set('list_request', listRequest);

	return tokenCmd;
};

module.exports.signCommand = (signingIdentity, command) => {
	logger.debug('signCommand - Start');

	const command_bytes = command.toBuffer();
	const signature = Buffer.from(signingIdentity.sign(command_bytes));
	const signedCommand = new fabprotos.token.SignedCommand();
	signedCommand.setCommand(command_bytes);
	signedCommand.setSignature(signature);
	return signedCommand;
};

module.exports.buildTokenCommandHeader = (creator, channelId, nonce, tlsCertHash) => {
	logger.debug('buildTokenCommandHeader - start');

	const timestamp = client_utils.buildCurrentTimestamp();
	const header = new fabprotos.token.Header();
	header.setChannelId(channelId);
	header.setCreator(creator.serialize());
	header.setNonce(nonce);
	header.setTimestamp(timestamp);
	if (tlsCertHash !== undefined && tlsCertHash !== null) {
		header.setTlsCertHash(tlsCertHash);
	}

	return header;
};