Add progressive canary deployer CLI

cmd/cli/main.go

@@ -0,0 +1,78 @@
+package main
+
+import (
+	"flag"
+	"log"
+
+	"time"
+
+	istioclientset "github.com/knative/pkg/client/clientset/versioned"
+	"github.com/knative/pkg/signals"
+	pd "github.com/stefanprodan/steerer/pkg/deployer"
+	"github.com/stefanprodan/steerer/pkg/logging"
+	"k8s.io/client-go/kubernetes"
+	_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
+	"k8s.io/client-go/tools/clientcmd"
+)
+
+var (
+	namespace   string
+	masterURL   string
+	kubeconfig  string
+	window      time.Duration
+)
+
+func init() {
+	flag.StringVar(&kubeconfig, "kubeconfig", "", "Path to a kubeconfig. Only required if out-of-cluster.")
+	flag.StringVar(&masterURL, "master", "", "The address of the Kubernetes API server. Overrides any value in kubeconfig. Only required if out-of-cluster.")
+
+	flag.StringVar(&namespace, "namespace", "", "Kubernetes namespace.")
+	flag.DurationVar(&window, "window", 10*time.Second, "wait interval between deployment rollouts")
+}
+
+func main() {
+	flag.Parse()
+
+	logger, err := logging.NewLogger("debug")
+	if err != nil {
+		log.Fatalf("Error creating logger: %v", err)
+	}
+	defer logger.Sync()
+
+	cfg, err := clientcmd.BuildConfigFromFlags(masterURL, kubeconfig)
+	if err != nil {
+		logger.Fatalf("Error building kubeconfig: %v", err)
+	}
+
+	kubeClient, err := kubernetes.NewForConfig(cfg)
+	if err != nil {
+		logger.Fatalf("Error building kubernetes clientset: %v", err)
+	}
+
+	istioClient, err := istioclientset.NewForConfig(cfg)
+	if err != nil {
+		logger.Fatalf("Error building shared clientset: %v", err)
+	}
+
+	ver, err := kubeClient.Discovery().ServerVersion()
+	if err != nil {
+		logger.Fatalf("Error calling Kubernetes API: %v", err)
+	}
+	logger.Infof("Connected to Kubernetes API %v", ver)
+
+	stopCh := signals.SetupSignalHandler()
+
+	deployer := pd.NewDeployer(kubeClient, istioClient, logger)
+
+	tickChan := time.NewTicker(window).C
+
+	for {
+		select {
+		case <-tickChan:
+			deployer.Run(namespace)
+		case <-stopCh:
+			return
+		}
+	}
+}
+