Add MQTT presence to Redis integration

2026-02-02 12:35:38 +07:00
parent e1ceb88ba5
commit af21216d4c
5 changed files with 195 additions and 0 deletions
--- a/mqtt/mqtt_presence_redis_go.go
+++ b/mqtt/mqtt_presence_redis_go.go
@@ -0,0 +1,123 @@
+package main
+
+import (
+    "encoding/json"
+    "fmt"
+    "log"
+    "os"
+    "strings"
+    "time"
+    "strconv"
+
+    mqtt "github.com/eclipse/paho.mqtt.golang"
+    "github.com/go-redis/redis/v8"
+    "golang.org/x/net/context"
+)
+
+// Configuration loaded from environment variables. These should match the
+// Django settings used in the original Python implementation.
+var (
+    mqttHost          = getEnv("MQTT_HOST", "localhost")
+    mqttPort          = getEnv("MQTT_PORT", "1883")
+    mqttUser          = getEnv("MQTT_USER", "")
+    mqttPass          = getEnv("MQTT_PASS", "")
+    mqttTopicPresence = getEnv("MQTT_TOPIC_PRESENCE", "presence")
+
+    redisHost = getEnv("MQTT_REDIS_HOST", "localhost")
+    redisPort = getEnv("MQTT_REDIS_PORT", "6379")
+    redisDB   = getEnv("MQTT_REDIS_DB", "0")
+
+    redisPrefix   = getEnv("MQTT_REDIS_PREFIX", "presence")
+    redisSetEX    = getEnv("MQTT_REDIS_SETEX", "86400") // seconds
+    redisPassword = getEnv("MQTT_REDIS_PASSWORD", "")
+)
+
+func main() {
+    ctx := context.Background()
+
+    // Connect to Redis
+    rdb := redis.NewClient(&redis.Options{
+        Addr:     fmt.Sprintf("%s:%s", redisHost, redisPort),
+        Password: redisPassword,
+        DB:       atoi(redisDB),
+    })
+
+    // Ping to verify connection
+    if err := rdb.Ping(ctx).Err(); err != nil {
+        log.Fatalf("Could not connect to Redis: %v", err)
+    }
+
+    // MQTT client options
+    opts := mqtt.NewClientOptions()
+    opts.AddBroker(fmt.Sprintf("tcp://%s:%s", mqttHost, mqttPort))
+    opts.SetUsername(mqttUser)
+    opts.SetPassword(mqttPass)
+    opts.SetClientID("mqtt_presence_redis_go")
+
+    // Handlers
+    opts.SetDefaultPublishHandler(func(client mqtt.Client, msg mqtt.Message) {
+        handleMessage(ctx, rdb, msg)
+    })
+
+    opts.OnConnect = func(c mqtt.Client) {
+        if token := c.Subscribe(mqttTopicPresence, 0, nil); token.Wait() && token.Error() != nil {
+            log.Fatalf("Failed to subscribe: %v", token.Error())
+        }
+        log.Printf("Connected to MQTT broker %s:%s, subscribed to %s", mqttHost, mqttPort, mqttTopicPresence)
+    }
+
+    // Create and start client
+    client := mqtt.NewClient(opts)
+    if token := client.Connect(); token.Wait() && token.Error() != nil {
+        log.Fatalf("Could not connect to MQTT broker: %v", token.Error())
+    }
+
+    // Block forever
+    select {}
+}
+
+func handleMessage(ctx context.Context, rdb *redis.Client, msg mqtt.Message) {
+    payload := string(msg.Payload())
+    log.Printf("Received message: %s", payload)
+
+    parts := strings.Split(payload, ";")
+    if len(parts) == 0 {
+        return
+    }
+    memberID := parts[0]
+    if len(memberID) > 50 {
+        memberID = memberID[:50]
+    }
+
+    key := fmt.Sprintf("%s:%s", redisPrefix, memberID)
+    timestamp := time.Now().Unix()
+
+    msgObj := map[string]interface{}{
+        "mqtt": payload,
+        "ts":   timestamp,
+    }
+    data, err := json.Marshal(msgObj)
+    if err != nil {
+        log.Printf("Failed to marshal message: %v", err)
+        return
+    }
+
+    if err := rdb.SetEX(ctx, key, data, time.Duration(atoi(redisSetEX))*time.Second).Err(); err != nil {
+        log.Printf("Failed to set Redis key: %v", err)
+    }
+}
+
+func getEnv(key, defaultVal string) string {
+    if v := os.Getenv(key); v != "" {
+        return v
+    }
+    return defaultVal
+}
+
+func atoi(s string) int {
+    i, err := strconv.Atoi(s)
+    if err != nil {
+        return 0
+    }
+    return i
+}