@mathquis/node-assistant-protocol/src/traits/volumeOffsetable.js

Assistant protocol decorator for Hermes protocol

module.exports = (hermes, logger) => {
	return (topic, object) => {
		return {
			...object,
			offsetVolume: async (siteId, offset) => {
				offset = parseInt(offset)
				if ( isNaN(offset) ) throw new Error('Invalid offset "' + offset + '"')
				offset = Math.max(-100, Math.min(100, offset))
				logger.debug('Offseting %s volume on site "%s" of %d', object.name, siteId, offset)
				await hermes.publish(topic, hermes.serialize({
					siteId, offset
				}))
			},
			onOffsetVolume: (handler) => {
				return hermes.on(topic, handler)
			}
		}
	}
}