Canary CRD refactoring

- set canaries.flagger.app version to v1alpha1
- replace old Canary spec with CanaryDeployment

pkg/controller/utils.go

@@ -0,0 +1,79 @@
+package controller
+
+import (
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp/cmpopts"
+	flaggerv1 "github.com/stefanprodan/flagger/pkg/apis/flagger/v1alpha1"
+	appsv1 "k8s.io/api/apps/v1"
+	corev1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/resource"
+	"k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+func (c *Controller) saveDeploymentSpec(cd *flaggerv1.Canary, dep *appsv1.Deployment) error {
+	specJson, err := json.Marshal(dep.Spec.Template.Spec)
+	if err != nil {
+		return err
+	}
+
+	specEnc := base64.StdEncoding.EncodeToString(specJson)
+	cd.Status.CanaryRevision = specEnc
+	cd, err = c.rolloutClient.FlaggerV1alpha1().Canaries(cd.Namespace).Update(cd)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (c *Controller) diffDeploymentSpec(cd *flaggerv1.Canary, dep *appsv1.Deployment) (bool, error) {
+	if cd.Status.CanaryRevision == "" {
+		return true, nil
+	}
+
+	newSpec := &dep.Spec.Template.Spec
+	oldSpecJson, err := base64.StdEncoding.DecodeString(cd.Status.CanaryRevision)
+	if err != nil {
+		return false, err
+	}
+	oldSpec := &corev1.PodSpec{}
+	err = json.Unmarshal(oldSpecJson, oldSpec)
+	if err != nil {
+		return false, err
+	}
+
+	if diff := cmp.Diff(*newSpec, *oldSpec, cmpopts.IgnoreUnexported(resource.Quantity{})); diff != "" {
+		fmt.Println(diff)
+		return true, nil
+	}
+
+	return false, nil
+}
+
+func (c *Controller) getDeploymentSpec(name string, namespace string) (string, error) {
+	dep, err := c.kubeClient.AppsV1().Deployments(namespace).Get(name, v1.GetOptions{})
+	if err != nil {
+		return "", err
+	}
+
+	specJson, err := json.Marshal(dep.Spec.Template.Spec)
+	if err != nil {
+		return "", err
+	}
+
+	specEnc := base64.StdEncoding.EncodeToString(specJson)
+	return specEnc, nil
+}
+
+func (c *Controller) getDeploymentSpecEnc(dep *appsv1.Deployment) (string, error) {
+	specJson, err := json.Marshal(dep.Spec.Template.Spec)
+	if err != nil {
+		return "", err
+	}
+
+	specEnc := base64.StdEncoding.EncodeToString(specJson)
+	return specEnc, nil
+}