backend update

backend/config.json

@@ -0,0 +1,4 @@
+{
+  "port": "8080",
+  "db_url": "postgres://monitor:monitorpassword@localhost:5432/vdimonitor?sslmode=disable"
+}

backend/go.sum

@@ -0,0 +1,2 @@
+github.com/lib/pq v1.10.9 h1:YXG7RB+JIjhP29X+OtkiDnYaXQwpS4JEWq7dtCCRUEw=
+github.com/lib/pq v1.10.9/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=

backend/main.go

@@ -6,10 +6,41 @@ import (
 	"log"
 	"net/http"
 	"os"
+	"strings"
 
 	_ "github.com/lib/pq"
 )
 
+type Config struct {
+	Port  string `json:"port"`
+	DBUrl string `json:"db_url"`
+}
+
+func loadConfig() Config {
+	cfg := Config{
+		Port:  "8080",
+		DBUrl: "postgres://monitor:monitorpassword@localhost:5432/vdimonitor?sslmode=disable",
+	}
+
+	file, err := os.Open("config.json")
+	if err == nil {
+		defer file.Close()
+		decoder := json.NewDecoder(file)
+		if err := decoder.Decode(&cfg); err != nil {
+			log.Printf("Warning: Failed to parse config.json: %v", err)
+		}
+	}
+
+	if envPort := os.Getenv("PORT"); envPort != "" {
+		cfg.Port = envPort
+	}
+	if envDB := os.Getenv("DB_URL"); envDB != "" {
+		cfg.DBUrl = envDB
+	}
+
+	return cfg
+}
+
 type MetricPayload struct {
 	Hostname            string          `json:"hostname"`
 	TotalCpuPercent     float64         `json:"total_cpu_percent"`
@@ -25,13 +56,10 @@ type MetricPayload struct {
 var db *sql.DB
 
 func main() {
-	dbUrl := os.Getenv("DB_URL")
-	if dbUrl == "" {
-		dbUrl = "postgres://monitor:monitorpassword@localhost:5432/vdimonitor?sslmode=disable"
-	}
+	cfg := loadConfig()
 
 	var err error
-	db, err = sql.Open("postgres", dbUrl)
+	db, err = sql.Open("postgres", cfg.DBUrl)
 	if err != nil {
 		log.Fatalf("Failed to connect to db: %v", err)
 	}
@@ -39,8 +67,13 @@ func main() {
 
 	http.HandleFunc("/api/metrics", handleMetrics)
 
-	log.Println("Server starting on :8080")
-	log.Fatal(http.ListenAndServe(":8080", nil))
+	port := cfg.Port
+	if !strings.HasPrefix(port, ":") {
+		port = ":" + port
+	}
+
+	log.Printf("Server starting on %s\n", port)
+	log.Fatal(http.ListenAndServe(port, nil))
 }
 
 func handleMetrics(w http.ResponseWriter, r *http.Request) {

docker-compose.yml

@@ -16,6 +16,7 @@ services:
     ports:
       - "8081:8080"
     environment:
+      PORT: "8080"
       DB_URL: postgres://monitor:monitorpassword@db:5432/vdimonitor?sslmode=disable
     depends_on:
       - db