feat: save device status at database + add mqtt persistence at redis #30

backend/services/controller/cmd/oktopus/main.go

@@ -29,6 +29,7 @@ func main() {
 	log.Println("Starting Oktopus Project TR-369 Controller Version:", VERSION)
 	// fl_endpointId := flag.String("endpoint_id", "proto::oktopus-controller", "Defines the enpoint id the Agent must trust on.")
 	flDevicesTopic := flag.String("d", "oktopus/devices", "That's the topic mqtt broker end new devices info.")
+	flDisconTopic := flag.String("dis", "oktopus/disconnect", "It's where disconnected IoTs are known.")
 	flSubTopic := flag.String("sub", "oktopus/+/controller/+", "That's the topic agent must publish to, and the controller keeps on listening.")
 	flBrokerAddr := flag.String("a", "localhost", "Mqtt broker adrress")
 	flBrokerPort := flag.String("p", "1883", "Mqtt broker port")
@@ -66,6 +67,7 @@ func main() {
 		QoS:             *flBrokerQos,
 		SubTopic:        *flSubTopic,
 		DevicesTopic:    *flDevicesTopic,
+		DisconnectTopic: *flDisconTopic,
 		CA:              *flTlsCert,
 		DB:              database,
 	}

backend/services/controller/internal/db/device.go

@@ -13,6 +13,7 @@ type Device struct {
 	Customer string
 	Vendor   string
 	Version  string
+	Status   uint8
 }
 
 func (d *Database) CreateDevice(device Device) error {

backend/services/controller/internal/db/status.go

@@ -0,0 +1,21 @@
+package db
+
+import (
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/mongo"
+	"log"
+)
+
+func (d *Database) UpdateStatus(sn string, status uint8) error {
+	var result bson.M
+	err := d.devices.FindOneAndUpdate(d.ctx, bson.D{{"sn", sn}}, bson.D{{"$set", bson.D{{"status", status}}}}).Decode(&result)
+	if err != nil {
+		if err == mongo.ErrNoDocuments {
+			log.Printf("Device %s is not mapped into database", sn)
+			return nil
+		}
+		log.Println(err)
+	}
+	log.Printf("%s is now offline.", sn)
+	return err
+}

backend/services/controller/internal/mqtt/mqtt.go

@@ -27,6 +27,7 @@ type Mqtt struct {
 	QoS             int
 	SubTopic        string
 	DevicesTopic    string
+	DisconnectTopic string
 	CA              string
 	DB              db.Database
 }
@@ -38,8 +39,9 @@ var c *paho.Client
 func (m *Mqtt) Connect() {
 	devices := make(chan *paho.Publish)
 	controller := make(chan *paho.Publish)
-	go m.messageHandler(devices, controller)
+	disconnect := make(chan *paho.Publish)
-	clientConfig := m.startClient(devices, controller)
+	go m.messageHandler(devices, controller, disconnect)
+	clientConfig := m.startClient(devices, controller, disconnect)
 	connParameters := startConnection(m.Id, m.User, m.Passwd)
 
 	conn, err := clientConfig.Connect(m.Ctx, &connParameters)
@@ -69,6 +71,7 @@ func (m *Mqtt) Subscribe() {
 		Subscriptions: map[string]paho.SubscribeOptions{
 			m.SubTopic:        {QoS: byte(m.QoS), NoLocal: true},
 			m.DevicesTopic:    {QoS: byte(m.QoS), NoLocal: true},
+			m.DisconnectTopic: {QoS: byte(m.QoS), NoLocal: true},
 		},
 	}); err != nil {
 		log.Fatalln(err)
@@ -76,6 +79,8 @@ func (m *Mqtt) Subscribe() {
 
 	log.Printf("Subscribed to %s", m.SubTopic)
 	log.Printf("Subscribed to %s", m.DevicesTopic)
+	log.Printf("Subscribed to %s", m.DisconnectTopic)
+
 }
 
 func (m *Mqtt) Publish(msg []byte, topic, respTopic string) {
@@ -96,12 +101,14 @@ func (m *Mqtt) Publish(msg []byte, topic, respTopic string) {
 
 /* -------------------------------------------------------------------------- */
 
-func (m *Mqtt) startClient(devices, controller chan *paho.Publish) *paho.Client {
+func (m *Mqtt) startClient(devices, controller, disconnect chan *paho.Publish) *paho.Client {
 	singleHandler := paho.NewSingleHandlerRouter(func(p *paho.Publish) {
 		if p.Topic == m.DevicesTopic {
 			devices <- p
 		} else if strings.Contains(p.Topic, "controller") {
 			controller <- p
+		} else if p.Topic == m.DisconnectTopic {
+			disconnect <- p
 		} else {
 			log.Println("No handler for topic: ", p.Topic)
 		}
@@ -210,7 +217,7 @@ func startConnection(id, user, pass string) paho.Connect {
 	return connParameters
 }
 
-func (m *Mqtt) messageHandler(devices, controller chan *paho.Publish) {
+func (m *Mqtt) messageHandler(devices, controller, disconnect chan *paho.Publish) {
 	for {
 		select {
 		case d := <-devices:
@@ -219,6 +226,10 @@ func (m *Mqtt) messageHandler(devices, controller chan *paho.Publish) {
 			m.handleNewDevice(payload)
 		case c := <-controller:
 			m.handleDevicesResponse(c.Payload)
+		case dis := <-disconnect:
+			payload := string(dis.Payload)
+			log.Println("Device disconnected: ", payload)
+			m.handleDevicesDisconnect(payload)
 		}
 	}
 }
@@ -287,9 +298,18 @@ func (m *Mqtt) handleDevicesResponse(p []byte) {
 	device.Model = msg.ReqPathResults[1].ResolvedPathResults[0].ResultParams["ModelName"]
 	device.Version = msg.ReqPathResults[2].ResolvedPathResults[0].ResultParams["SoftwareVersion"]
 	device.SN = msg.ReqPathResults[3].ResolvedPathResults[0].ResultParams["SerialNumber"]
+	device.Status = utils.Online
 
 	err = m.DB.CreateDevice(device)
 	if err != nil {
 		log.Fatal(err)
 	}
 }
+
+func (m *Mqtt) handleDevicesDisconnect(p string) {
+	// Update status of device at database
+	err := m.DB.UpdateStatus(p, utils.Offline)
+	if err != nil {
+		log.Fatal(err)
+	}
+}

backend/services/controller/internal/utils/utils.go

@@ -4,6 +4,13 @@ import (
 	"net"
 )
 
+//Status are saved at database as numbers
+const (
+	Online = iota
+	Associating
+	Offline
+)
+
 // Get interfaces MACs, and the first interface MAC is gonna be used as mqtt clientId
 func GetMacAddr() ([]string, error) {
 	ifas, err := net.Interfaces()

backend/services/mochi/cmd/main.go

@@ -15,8 +15,10 @@ import (
 	"strings"
 	"syscall"
 
+	rv8 "github.com/go-redis/redis/v8"
 	"github.com/mochi-co/mqtt/v2"
 	"github.com/mochi-co/mqtt/v2/hooks/auth"
+	"github.com/mochi-co/mqtt/v2/hooks/storage/redis"
 	"github.com/mochi-co/mqtt/v2/listeners"
 )
 
@@ -34,6 +36,7 @@ var server = mqtt.New(&mqtt.Options{
 
 func main() {
 	tcpAddr := flag.String("tcp", ":1883", "network address for TCP listener")
+	redisAddr := flag.String("redis", "172.17.0.2:6379", "host address of redis db")
 	wsAddr := flag.String("ws", "", "network address for Websocket listener")
 	infoAddr := flag.String("info", "", "network address for web info dashboard listener")
 	path := flag.String("path", "", "path to data auth file")
@@ -98,6 +101,17 @@ func main() {
 		log.Fatal(err)
 	}
 
+	err = server.AddHook(new(redis.Hook), &redis.Options{
+		Options: &rv8.Options{
+			Addr:     *redisAddr, // default redis address
+			Password: "",         // your password
+			DB:       0,          // your redis db
+		},
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+
 	go func() {
 		err := server.Serve()
 		if err != nil {
@@ -123,6 +137,7 @@ func (h *MyHook) ID() string {
 func (h *MyHook) Provides(b byte) bool {
 	return bytes.Contains([]byte{
 		mqtt.OnSubscribed,
+		mqtt.OnDisconnect,
 	}, []byte{b})
 }
 
@@ -131,6 +146,26 @@ func (h *MyHook) Init(config any) error {
 	return nil
 }
 
+func (h *MyHook) Red(config any) error {
+	h.Log.Info().Msg("initialised")
+	return nil
+}
+
+func (h *MyHook) OnDisconnect(cl *mqtt.Client, err error, expire bool) {
+	var clUser string
+	if len(cl.Properties.Props.User) > 0 {
+		clUser = cl.Properties.Props.User[0].Val
+	}
+
+	if clUser != "" {
+		sn := strings.Split(clUser, "-")
+		err := server.Publish("oktopus/disconnect", []byte(sn[1]), false, 1)
+		if err != nil {
+			log.Println("server publish error: ", err)
+		}
+	}
+}
+
 func (h *MyHook) OnSubscribed(cl *mqtt.Client, pk packets.Packet, reasonCodes []byte) {
 	// Verifies if it's a device who is subscribed
 	if strings.Contains(pk.Filters[0].Filter, "oktopus/v1/agent") {