fix: clickhouse logs and reg agents

agent/main.go

@@ -39,33 +39,38 @@ func main() {
 	lgr := logger.New(os.Getenv("IS_DEBUG") == "1")
 	lgr.Debug("Config parsed", "cfg", cfg)
 
-	if cfg.RegistrationToken == "" {
-		lgr.Error("No registration token provided")
-		os.Exit(1)
-	}
+	// Check if certificates already exist (agent was previously registered)
+	if registration.CertsExist(cfg.CertDir) {
+		lgr.Info("Certificates found, skipping registration")
+	} else {
+		if cfg.RegistrationToken == "" {
+			lgr.Error("No registration token provided")
+			os.Exit(1)
+		}
 
-	// Generate key and CSR
-	key, csrPEM, err := registration.GenerateKeyAndCSR(cfg.Label)
-	if err != nil {
-		lgr.Error("Failed to generate key and CSR", "err", err)
-		os.Exit(1)
-	}
-	lgr.Info("Generated ECDSA key pair and CSR")
+		// Generate key and CSR
+		k, csrPEM, err := registration.GenerateKeyAndCSR(cfg.Label)
+		if err != nil {
+			lgr.Error("Failed to generate key and CSR", "err", err)
+			os.Exit(1)
+		}
+		lgr.Info("Generated ECDSA key pair and CSR")
 
-	// Register with backend
-	certs, err := registration.Register(cfg.BackendURL, cfg.RegistrationToken, csrPEM)
-	if err != nil {
-		lgr.Error("Failed to register", "err", err)
-		os.Exit(1)
-	}
-	lgr.Info("Successfully registered, received certificates")
+		// Register with backend
+		certs, err := registration.Register(cfg.BackendURL, cfg.RegistrationToken, csrPEM)
+		if err != nil {
+			lgr.Error("Failed to register", "err", err)
+			os.Exit(1)
+		}
+		lgr.Info("Successfully registered, received certificates")
 
-	// Save certificates
-	if err := registration.SaveCerts(cfg.CertDir, certs, key); err != nil {
-		lgr.Error("Failed to save certificates", "err", err)
-		os.Exit(1)
+		// Save certificates
+		if err := registration.SaveCerts(cfg.CertDir, certs, k); err != nil {
+			lgr.Error("Failed to save certificates", "err", err)
+			os.Exit(1)
+		}
+		lgr.Info("Certificates saved", "cert_dir", cfg.CertDir)
 	}
-	lgr.Info("Certificates saved", "cert_dir", cfg.CertDir)
 
 	creds, err := mtls.LoadMTLSCredentialsFromFiles(
 		cfg.CertDir+"/ca.crt",