Prepare for storing device data in database

- create device id from mqtt topic
- implement method for storing device in database

Still todo:
- extract other data (e.g. MAC, SN) from monitoring object
- find a way in mqtt to use global env

models/db.go

@@ -8,6 +8,7 @@ import (
 
 type Datastore interface {
 	AllDevices() ([]*Device, error)
+	InsertDevice(*Device) error
 }
 
 type DB struct {

models/devices.go

@@ -1,36 +1,41 @@
 package models
 
 type Device struct {
-	ID string
-	MAC string
-	SN string
+	ID      string
+	MAC     string
+	SN      string
 	LastMsg string
 }
 
-
-
-
-
 func (db *DB) AllDevices() ([]*Device, error) {
-    rows, err := db.Query("SELECT * FROM devices")
-    if err != nil {
-        return nil, err
-    }
-    defer rows.Close()
+	rows, err := db.Query("SELECT * FROM devices")
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
 
-    devices := make([]*Device, 0)
-    for rows.Next() {
-        device := new(Device)
-        err := rows.Scan(&device.ID, &device.MAC, &device.SN, &device.LastMsg)
-        if err != nil {
-            return nil, err
-        }
-        devices = append(devices, device)
-    }
-    if err = rows.Err(); err != nil {
-        return nil, err
-    }
-    return devices, nil
+	devices := make([]*Device, 0)
+	for rows.Next() {
+		device := new(Device)
+		err := rows.Scan(&device.ID, &device.MAC, &device.SN, &device.LastMsg)
+		if err != nil {
+			return nil, err
+		}
+		devices = append(devices, device)
+	}
+	if err = rows.Err(); err != nil {
+		return nil, err
+	}
+	return devices, nil
 }
 
+func (db *DB) InsertDevice(device *Device) error {
+	sqlStmt := `INSERT OR REPLACE INTO table (id, mac, sn, lastMsg)
+                VALUES($1, $2, $3, $4);`
+	_, err := db.Exec(sqlStmt, device.ID, device.MAC, device.SN, device.LastMsg)
+	if err != nil {
+		return err
+	}
 
+	return err
+}

mqtt/mqtt.go

@@ -7,10 +7,12 @@ import (
 	"log"
 	"net/url"
 	"strconv"
+	"strings"
 
 	MQTT "github.com/eclipse/paho.mqtt.golang"
 	//"os"
 	"mqttListener/Config"
+	"mqttListener/models"
 	"regexp"
 	"time"
 )
@@ -124,9 +126,11 @@ var subscriptionHandler = func(client MQTT.Client, msg MQTT.Message) {
 	fmt.Printf("MSG: \n%s\n", msg.Payload())
 	//fmt.Printf("* [%s] %s\n", msg.Topic(), string(msg.Payload()))
 
-	regexpWithType := "\\/ATB\\/[A-Z]+\\/[0-9]+\\/[0-9]+\\/[0-9]+\\/[0-9]+\\/mo"
+	regexpWithType := "\\/ATB\\/[A-Z]+\\/[0-9]+\\/[0-9]+\\/mo"
 	regexpDefault := "\\/ATB\\/[0-9]+\\/[0-9]+\\/[0-9]+\\/[0-9]+\\/mo"
 
+	topicSlice := strings.Split(msg.Topic(), "/")
+
 	matchedWithType, err := regexp.MatchString(regexpWithType, msg.Topic())
 	if err != nil {
 		log.Printf("ERROR: matchedWithType: %s", err.Error())
@@ -136,11 +140,25 @@ var subscriptionHandler = func(client MQTT.Client, msg MQTT.Message) {
 		log.Printf("ERROR: matchedDefault: %s", err.Error())
 	}
 
+	var deviceID string
 	if matchedWithType {
 		fmt.Printf("Topic matched regexpWithType\n")
+		deviceID = topicSlice[2] + "_" + topicSlice[3] + "_" + topicSlice[4]
 	} else if matchedDefault {
 		fmt.Printf("Topic matched regexpDefault\n")
+		deviceID = topicSlice[2] + "_" + topicSlice[3] + "_" + topicSlice[4] + "_" + topicSlice[5]
 	} else {
 		log.Printf("ERROR: no matching topic: %s", msg.Topic())
+		return
 	}
+
+	fmt.Printf("Generated deviceID = %s\n", deviceID)
+
+	var device models.Device
+	device.ID = deviceID
+	device.MAC = "t.b.d."
+	device.SN = "t.b.d."
+	device.LastMsg = "t.b.d"
+
+	// TODO: store this device in database
 }