Refactor to prepare for structured logs

cmd/nginx-ingress/flags.go

@@ -217,50 +217,12 @@ var (
 func parseFlags() {
 	flag.Parse()
 
-	if *versionFlag {
+	if *versionFlag { // printed in main
 		os.Exit(0)
 	}
+}
 
-	mustValidateInitialChecks()
-	mustValidateWatchedNamespaces()
-	mustValidateFlags()
-
-	if *enableTLSPassthrough && !*enableCustomResources {
-		glog.Fatal("enable-tls-passthrough flag requires -enable-custom-resources")
-	}
-
-	if *appProtect && !*nginxPlus {
-		glog.Fatal("NGINX App Protect support is for NGINX Plus only")
-	}
-
-	if *appProtectLogLevel != appProtectLogLevelDefault && !*appProtect && !*nginxPlus {
-		glog.Fatal("app-protect-log-level support is for NGINX Plus only and App Protect is enable")
-	}
-
-	if *appProtectDos && !*nginxPlus {
-		glog.Fatal("NGINX App Protect Dos support is for NGINX Plus only")
-	}
-
-	if *appProtectDosDebug && !*appProtectDos && !*nginxPlus {
-		glog.Fatal("NGINX App Protect Dos debug support is for NGINX Plus only and App Protect Dos is enable")
-	}
-
-	if *appProtectDosMaxDaemons != 0 && !*appProtectDos && !*nginxPlus {
-		glog.Fatal("NGINX App Protect Dos max daemons support is for NGINX Plus only and App Protect Dos is enable")
-	}
-
-	if *appProtectDosMaxWorkers != 0 && !*appProtectDos && !*nginxPlus {
-		glog.Fatal("NGINX App Protect Dos max workers support is for NGINX Plus and App Protect Dos is enable")
-	}
-
-	if *appProtectDosMemory != 0 && !*appProtectDos && !*nginxPlus {
-		glog.Fatal("NGINX App Protect Dos memory support is for NGINX Plus and App Protect Dos is enable")
-	}
-
-	if *enableInternalRoutes && *spireAgentAddress == "" {
-		glog.Fatal("enable-internal-routes flag requires spire-agent-address")
-	}
-
+func initValidate() {
 	if *enableLatencyMetrics && !*enablePrometheusMetrics {
 		glog.Warning("enable-latency-metrics flag requires enable-prometheus-metrics, latency metrics will not be collected")
 		*enableLatencyMetrics = false
@@ -271,26 +233,14 @@ func parseFlags() {
 		*enableServiceInsight = false
 	}
 
-	if *enableCertManager && !*enableCustomResources {
-		glog.Fatal("enable-cert-manager flag requires -enable-custom-resources")
-	}
-
-	if *enableExternalDNS && !*enableCustomResources {
-		glog.Fatal("enable-external-dns flag requires -enable-custom-resources")
-	}
-
-	if *ingressLink != "" && *externalService != "" {
-		glog.Fatal("ingresslink and external-service cannot both be set")
-	}
-
 	if *enableDynamicWeightChangesReload && !*nginxPlus {
 		glog.Warning("weight-changes-dynamic-reload flag support is for NGINX Plus, Dynamic Weight Changes will not be enabled")
 		*enableDynamicWeightChangesReload = false
 	}
 
-	if *agent && !*appProtect {
-		glog.Fatal("NGINX Agent is used to enable the Security Monitoring dashboard and requires NGINX App Protect to be enabled")
-	}
+	mustValidateInitialChecks()
+	mustValidateWatchedNamespaces()
+	mustValidateFlags()
 }
 
 func mustValidateInitialChecks() {
@@ -402,6 +352,58 @@ func mustValidateFlags() {
 			glog.Fatalf("Invalid value for app-protect-log-level: %v", *appProtectLogLevel)
 		}
 	}
+
+	if *enableTLSPassthrough && !*enableCustomResources {
+		glog.Fatal("enable-tls-passthrough flag requires -enable-custom-resources")
+	}
+
+	if *appProtect && !*nginxPlus {
+		glog.Fatal("NGINX App Protect support is for NGINX Plus only")
+	}
+
+	if *appProtectLogLevel != appProtectLogLevelDefault && !*appProtect && !*nginxPlus {
+		glog.Fatal("app-protect-log-level support is for NGINX Plus only and App Protect is enable")
+	}
+
+	if *appProtectDos && !*nginxPlus {
+		glog.Fatal("NGINX App Protect Dos support is for NGINX Plus only")
+	}
+
+	if *appProtectDosDebug && !*appProtectDos && !*nginxPlus {
+		glog.Fatal("NGINX App Protect Dos debug support is for NGINX Plus only and App Protect Dos is enable")
+	}
+
+	if *appProtectDosMaxDaemons != 0 && !*appProtectDos && !*nginxPlus {
+		glog.Fatal("NGINX App Protect Dos max daemons support is for NGINX Plus only and App Protect Dos is enable")
+	}
+
+	if *appProtectDosMaxWorkers != 0 && !*appProtectDos && !*nginxPlus {
+		glog.Fatal("NGINX App Protect Dos max workers support is for NGINX Plus and App Protect Dos is enable")
+	}
+
+	if *appProtectDosMemory != 0 && !*appProtectDos && !*nginxPlus {
+		glog.Fatal("NGINX App Protect Dos memory support is for NGINX Plus and App Protect Dos is enable")
+	}
+
+	if *enableInternalRoutes && *spireAgentAddress == "" {
+		glog.Fatal("enable-internal-routes flag requires spire-agent-address")
+	}
+
+	if *enableCertManager && !*enableCustomResources {
+		glog.Fatal("enable-cert-manager flag requires -enable-custom-resources")
+	}
+
+	if *enableExternalDNS && !*enableCustomResources {
+		glog.Fatal("enable-external-dns flag requires -enable-custom-resources")
+	}
+
+	if *ingressLink != "" && *externalService != "" {
+		glog.Fatal("ingresslink and external-service cannot both be set")
+	}
+
+	if *agent && !*appProtect {
+		glog.Fatal("NGINX Agent is used to enable the Security Monitoring dashboard and requires NGINX App Protect to be enabled")
+	}
 }
 
 // validateNamespaceNames validates the namespaces are in the correct format

cmd/nginx-ingress/main.go

@@ -62,8 +62,8 @@ const (
 func main() {
 	commitHash, commitTime, dirtyBuild := getBuildInfo()
 	fmt.Printf("NGINX Ingress Controller Version=%v Commit=%v Date=%v DirtyState=%v Arch=%v/%v Go=%v\n", version, commitHash, commitTime, dirtyBuild, runtime.GOOS, runtime.GOARCH, runtime.Version())
-
 	parseFlags()
+	initValidate()
 	parsedFlags := os.Args[1:]
 
 	buildOS := os.Getenv("BUILD_OS")