protokube: Simplify CloudProvider initialization

protokube/cmd/protokube/main.go

@@ -112,69 +112,32 @@ func run() error {
 
 	if gossip {
 		var cloudProvider protokube.CloudProvider
-		if cloud == "aws" {
-			awsCloudProvider, err := protokube.NewAWSCloudProvider()
-			if err != nil {
-				klog.Errorf("Error initializing AWS: %q", err)
-				os.Exit(1)
-			}
-			cloudProvider = awsCloudProvider
-
-		} else if cloud == "digitalocean" {
-			doCloudProvider, err := protokube.NewDOCloudProvider()
-			if err != nil {
-				klog.Errorf("Error initializing DigitalOcean: %q", err)
-				os.Exit(1)
-			}
-			cloudProvider = doCloudProvider
-
-		} else if cloud == "hetzner" {
-			hetznerCloudProvider, err := protokube.NewHetznerCloudProvider()
-			if err != nil {
-				klog.Errorf("error initializing Hetzner Cloud: %q", err)
-				os.Exit(1)
-			}
-			cloudProvider = hetznerCloudProvider
-
-		} else if cloud == "gce" {
-			gceCloudProvider, err := protokube.NewGCECloudProvider()
-			if err != nil {
-				klog.Errorf("Error initializing GCE: %q", err)
-				os.Exit(1)
-			}
-
-			cloudProvider = gceCloudProvider
-
-		} else if cloud == "openstack" {
-			osCloudProvider, err := protokube.NewOpenStackCloudProvider()
-			if err != nil {
-				klog.Errorf("Error initializing OpenStack: %q", err)
-				os.Exit(1)
-			}
-			cloudProvider = osCloudProvider
-
-		} else if cloud == "azure" {
-			azureVolumes, err := protokube.NewAzureCloudProvider()
-			if err != nil {
-				klog.Errorf("Error initializing Azure: %q", err)
-				os.Exit(1)
-			}
-			cloudProvider = azureVolumes
-
-		} else if cloud == "scaleway" {
-			scwCloudProvider, err := protokube.NewScwCloudProvider()
-			if err != nil {
-				klog.Errorf("Error initializing Scaleway: %q", err)
-				os.Exit(1)
-			}
-			cloudProvider = scwCloudProvider
-
-		} else if cloud == "metal" {
+		var err error
+		switch cloud {
+		case "aws":
+			cloudProvider, err = protokube.NewAWSCloudProvider()
+		case "digitalocean":
+			cloudProvider, err = protokube.NewDOCloudProvider()
+		case "hetzner":
+			cloudProvider, err = protokube.NewHetznerCloudProvider()
+		case "gce":
+			cloudProvider, err = protokube.NewGCECloudProvider()
+		case "openstack":
+			cloudProvider, err = protokube.NewOpenStackCloudProvider()
+		case "azure":
+			cloudProvider, err = protokube.NewAzureCloudProvider()
+		case "scaleway":
+			cloudProvider, err = protokube.NewScwCloudProvider()
+		case "metal":
 			cloudProvider = nil
-		} else {
+		default:
 			klog.Errorf("Unknown cloud %q", cloud)
 			os.Exit(1)
 		}
+		if err != nil {
+			klog.Errorf("Error initializing cloud %q: %s", cloud, err)
+			os.Exit(1)
+		}
 
 		if cloudProvider == nil {
 			return fmt.Errorf("gossip not supported with cloudprovider %q", cloud)