Set Up Notifier Module on Server

Overview

The Notifier module can be set up on TCP and UDP servers.

When using the Notifier module, it must be set up on all servers except for HTTP servers.

Setup

To expose built-in commands to the client, you can use the diarkisexec package for setup.

Add the following to the server's main function. Below is a sample setup for a UDP server. The setup function of diarkisexec must be executed before calling diarkisexec.StartDiarkis().

Additionally, you need to configure the message broadcast interval and content with diarkisexec.SetupNotificationService(name, interval, callback).

For more details, refer to the diarkisexec API Reference.

package main

import "github.com/Diarkis/diarkis/diarkisexec"

func main() {
	logConfigPath := "/configs/shared/log.json"
	meshConfigPath := ""

	diarkisexec.SetupDiarkis(logConfigPath, meshConfigPath, &diarkisexec.Modules{
		Notifier:   &diarkisexec.Options{},
	})
	diarkisexec.SetupNotificationService("Notification", 60, handleNotification)
	diarkisexec.SetupDiarkisUDPServer("/configs/udp/main.json")
	diarkisexec.StartDiarkis()
}

func handleNotification() (*diarkisexec.Notification, error) {
	// Retrieve notification data from a database by the current time
	notificationData := someDatabase.GetNotificationDataByCurrentTime(year, month, date)

	if notificationData == nil {
		// No notification data to send out
		return nil, nil
	}

	n := &diarkisexec.Notification{}
	n.ID = notificationData.ID
	n.Name = notificationData.Name

	// Ver is used by the client to identify the message when received.
	n.Ver = notificationData.Ver

	// Cmd is used by the client to identify the message when received.
	n.Cmd = notificationData.Cmd

	n.Message = []byte("Notification message says 'Hello from the server'")

	// TTL is in seconds to indicate the availability of the notification data.
	// The notification will be available for the not-connected-clients for the duration of TTL and
	// will be sent to the clients when they connect before TTL expires.
	n.TTL = int64(60 * 60) // one hour

	return n, nil
}