mirror of
https://github.com/fluxcd/flagger.git
synced 2026-02-25 07:14:03 +00:00
327 lines
10 KiB
Go
327 lines
10 KiB
Go
package controller
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import (
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"fmt"
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"github.com/google/go-cmp/cmp"
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"github.com/google/go-cmp/cmp/cmpopts"
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istiov1alpha3 "github.com/knative/pkg/apis/istio/v1alpha3"
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istioclientset "github.com/knative/pkg/client/clientset/versioned"
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flaggerv1 "github.com/stefanprodan/flagger/pkg/apis/flagger/v1alpha3"
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clientset "github.com/stefanprodan/flagger/pkg/client/clientset/versioned"
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"go.uber.org/zap"
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corev1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/api/errors"
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"k8s.io/apimachinery/pkg/apis/meta/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apimachinery/pkg/util/intstr"
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"k8s.io/client-go/kubernetes"
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)
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// CanaryRouter is managing the operations for Kubernetes service kind
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// and Istio virtual services
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type CanaryRouter struct {
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kubeClient kubernetes.Interface
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istioClient istioclientset.Interface
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flaggerClient clientset.Interface
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logger *zap.SugaredLogger
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}
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// Sync creates or updates the primary and canary ClusterIP services
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// and the Istio virtual service.
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func (c *CanaryRouter) Sync(cd *flaggerv1.Canary) error {
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err := c.createServices(cd)
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if err != nil {
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return err
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}
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err = c.syncVirtualService(cd)
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if err != nil {
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return err
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}
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return nil
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}
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func (c *CanaryRouter) createServices(cd *flaggerv1.Canary) error {
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targetName := cd.Spec.TargetRef.Name
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primaryName := fmt.Sprintf("%s-primary", targetName)
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canaryService, err := c.kubeClient.CoreV1().Services(cd.Namespace).Get(targetName, metav1.GetOptions{})
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if errors.IsNotFound(err) {
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canaryService = &corev1.Service{
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ObjectMeta: metav1.ObjectMeta{
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Name: targetName,
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Namespace: cd.Namespace,
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OwnerReferences: []metav1.OwnerReference{
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*metav1.NewControllerRef(cd, schema.GroupVersionKind{
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Group: flaggerv1.SchemeGroupVersion.Group,
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Version: flaggerv1.SchemeGroupVersion.Version,
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Kind: flaggerv1.CanaryKind,
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}),
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},
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},
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Spec: corev1.ServiceSpec{
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Type: corev1.ServiceTypeClusterIP,
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Selector: map[string]string{"app": targetName},
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Ports: []corev1.ServicePort{
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{
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Name: "http",
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Protocol: corev1.ProtocolTCP,
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Port: cd.Spec.Service.Port,
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TargetPort: intstr.IntOrString{
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Type: intstr.Int,
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IntVal: cd.Spec.Service.Port,
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},
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},
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},
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},
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}
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_, err = c.kubeClient.CoreV1().Services(cd.Namespace).Create(canaryService)
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if err != nil {
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return err
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}
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c.logger.With("canary", fmt.Sprintf("%s.%s", cd.Name, cd.Namespace)).Infof("Service %s.%s created", canaryService.GetName(), cd.Namespace)
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}
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canaryTestServiceName := fmt.Sprintf("%s-canary", cd.Spec.TargetRef.Name)
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canaryTestService, err := c.kubeClient.CoreV1().Services(cd.Namespace).Get(canaryTestServiceName, metav1.GetOptions{})
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if errors.IsNotFound(err) {
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canaryTestService = &corev1.Service{
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ObjectMeta: metav1.ObjectMeta{
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Name: canaryTestServiceName,
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Namespace: cd.Namespace,
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OwnerReferences: []metav1.OwnerReference{
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*metav1.NewControllerRef(cd, schema.GroupVersionKind{
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Group: flaggerv1.SchemeGroupVersion.Group,
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Version: flaggerv1.SchemeGroupVersion.Version,
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Kind: flaggerv1.CanaryKind,
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}),
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},
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},
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Spec: corev1.ServiceSpec{
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Type: corev1.ServiceTypeClusterIP,
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Selector: map[string]string{"app": targetName},
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Ports: []corev1.ServicePort{
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{
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Name: "http",
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Protocol: corev1.ProtocolTCP,
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Port: cd.Spec.Service.Port,
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TargetPort: intstr.IntOrString{
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Type: intstr.Int,
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IntVal: cd.Spec.Service.Port,
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},
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},
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},
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},
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}
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_, err = c.kubeClient.CoreV1().Services(cd.Namespace).Create(canaryTestService)
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if err != nil {
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return err
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}
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c.logger.With("canary", fmt.Sprintf("%s.%s", cd.Name, cd.Namespace)).Infof("Service %s.%s created", canaryTestService.GetName(), cd.Namespace)
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}
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primaryService, err := c.kubeClient.CoreV1().Services(cd.Namespace).Get(primaryName, metav1.GetOptions{})
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if errors.IsNotFound(err) {
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primaryService = &corev1.Service{
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ObjectMeta: metav1.ObjectMeta{
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Name: primaryName,
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Namespace: cd.Namespace,
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OwnerReferences: []metav1.OwnerReference{
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*metav1.NewControllerRef(cd, schema.GroupVersionKind{
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Group: flaggerv1.SchemeGroupVersion.Group,
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Version: flaggerv1.SchemeGroupVersion.Version,
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Kind: flaggerv1.CanaryKind,
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}),
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},
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},
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Spec: corev1.ServiceSpec{
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Type: corev1.ServiceTypeClusterIP,
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Selector: map[string]string{"app": primaryName},
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Ports: []corev1.ServicePort{
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{
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Name: "http",
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Protocol: corev1.ProtocolTCP,
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Port: cd.Spec.Service.Port,
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TargetPort: intstr.IntOrString{
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Type: intstr.Int,
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IntVal: cd.Spec.Service.Port,
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},
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},
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},
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},
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}
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_, err = c.kubeClient.CoreV1().Services(cd.Namespace).Create(primaryService)
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if err != nil {
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return err
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}
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c.logger.With("canary", fmt.Sprintf("%s.%s", cd.Name, cd.Namespace)).Infof("Service %s.%s created", primaryService.GetName(), cd.Namespace)
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}
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return nil
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}
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func (c *CanaryRouter) syncVirtualService(cd *flaggerv1.Canary) error {
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targetName := cd.Spec.TargetRef.Name
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primaryName := fmt.Sprintf("%s-primary", targetName)
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hosts := append(cd.Spec.Service.Hosts, targetName)
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gateways := append(cd.Spec.Service.Gateways, "mesh")
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route := []istiov1alpha3.DestinationWeight{
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{
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Destination: istiov1alpha3.Destination{
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Host: primaryName,
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Port: istiov1alpha3.PortSelector{
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Number: uint32(cd.Spec.Service.Port),
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},
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},
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Weight: 100,
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},
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{
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Destination: istiov1alpha3.Destination{
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Host: fmt.Sprintf("%s-canary", targetName),
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Port: istiov1alpha3.PortSelector{
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Number: uint32(cd.Spec.Service.Port),
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},
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},
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Weight: 0,
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},
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}
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newSpec := istiov1alpha3.VirtualServiceSpec{
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Hosts: hosts,
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Gateways: gateways,
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Http: []istiov1alpha3.HTTPRoute{
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{
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Match: cd.Spec.Service.Match,
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Rewrite: cd.Spec.Service.Rewrite,
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Timeout: cd.Spec.Service.Timeout,
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Retries: cd.Spec.Service.Retries,
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Route: route,
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},
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},
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}
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virtualService, err := c.istioClient.NetworkingV1alpha3().VirtualServices(cd.Namespace).Get(targetName, metav1.GetOptions{})
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// insert
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if errors.IsNotFound(err) {
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virtualService = &istiov1alpha3.VirtualService{
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ObjectMeta: metav1.ObjectMeta{
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Name: targetName,
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Namespace: cd.Namespace,
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OwnerReferences: []metav1.OwnerReference{
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*metav1.NewControllerRef(cd, schema.GroupVersionKind{
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Group: flaggerv1.SchemeGroupVersion.Group,
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Version: flaggerv1.SchemeGroupVersion.Version,
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Kind: flaggerv1.CanaryKind,
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}),
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},
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},
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Spec: newSpec,
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}
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_, err = c.istioClient.NetworkingV1alpha3().VirtualServices(cd.Namespace).Create(virtualService)
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if err != nil {
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return fmt.Errorf("VirtualService %s.%s create error %v", targetName, cd.Namespace, err)
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}
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c.logger.With("canary", fmt.Sprintf("%s.%s", cd.Name, cd.Namespace)).
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Infof("VirtualService %s.%s created", virtualService.GetName(), cd.Namespace)
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return nil
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}
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if err != nil {
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return fmt.Errorf("VirtualService %s.%s query error %v", targetName, cd.Namespace, err)
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}
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// update service but keep the original destination weights
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if virtualService != nil {
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if diff := cmp.Diff(newSpec, virtualService.Spec, cmpopts.IgnoreTypes(istiov1alpha3.DestinationWeight{})); diff != "" {
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//fmt.Println(diff)
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vtClone := virtualService.DeepCopy()
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vtClone.Spec = newSpec
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if len(virtualService.Spec.Http) > 0 {
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vtClone.Spec.Http[0].Route = virtualService.Spec.Http[0].Route
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}
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_, err = c.istioClient.NetworkingV1alpha3().VirtualServices(cd.Namespace).Update(vtClone)
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if err != nil {
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return fmt.Errorf("VirtualService %s.%s update error %v", targetName, cd.Namespace, err)
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}
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c.logger.With("canary", fmt.Sprintf("%s.%s", cd.Name, cd.Namespace)).
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Infof("VirtualService %s.%s updated", virtualService.GetName(), cd.Namespace)
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}
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}
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return nil
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}
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// GetRoutes returns the destinations weight for primary and canary
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func (c *CanaryRouter) GetRoutes(cd *flaggerv1.Canary) (
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primary istiov1alpha3.DestinationWeight,
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canary istiov1alpha3.DestinationWeight,
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err error,
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) {
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targetName := cd.Spec.TargetRef.Name
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vs := &istiov1alpha3.VirtualService{}
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vs, err = c.istioClient.NetworkingV1alpha3().VirtualServices(cd.Namespace).Get(targetName, v1.GetOptions{})
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if err != nil {
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if errors.IsNotFound(err) {
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err = fmt.Errorf("VirtualService %s.%s not found", targetName, cd.Namespace)
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return
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}
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err = fmt.Errorf("VirtualService %s.%s query error %v", targetName, cd.Namespace, err)
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return
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}
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for _, http := range vs.Spec.Http {
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for _, route := range http.Route {
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if route.Destination.Host == fmt.Sprintf("%s-primary", targetName) {
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primary = route
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}
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if route.Destination.Host == fmt.Sprintf("%s-canary", targetName) {
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canary = route
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}
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}
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}
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if primary.Weight == 0 && canary.Weight == 0 {
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err = fmt.Errorf("VirtualService %s.%s does not contain routes for %s-primary and %s-canary",
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targetName, cd.Namespace, targetName, targetName)
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}
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return
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}
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// SetRoutes updates the destinations weight for primary and canary
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func (c *CanaryRouter) SetRoutes(
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cd *flaggerv1.Canary,
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primary istiov1alpha3.DestinationWeight,
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canary istiov1alpha3.DestinationWeight,
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) error {
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targetName := cd.Spec.TargetRef.Name
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vs, err := c.istioClient.NetworkingV1alpha3().VirtualServices(cd.Namespace).Get(targetName, v1.GetOptions{})
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if err != nil {
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if errors.IsNotFound(err) {
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return fmt.Errorf("VirtualService %s.%s not found", targetName, cd.Namespace)
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}
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return fmt.Errorf("VirtualService %s.%s query error %v", targetName, cd.Namespace, err)
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}
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vsCopy := vs.DeepCopy()
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vsCopy.Spec.Http = []istiov1alpha3.HTTPRoute{
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{
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Match: cd.Spec.Service.Match,
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Rewrite: cd.Spec.Service.Rewrite,
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Timeout: cd.Spec.Service.Timeout,
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Retries: cd.Spec.Service.Retries,
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Route: []istiov1alpha3.DestinationWeight{primary, canary},
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},
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}
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vs, err = c.istioClient.NetworkingV1alpha3().VirtualServices(cd.Namespace).Update(vsCopy)
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if err != nil {
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return fmt.Errorf("VirtualService %s.%s update failed: %v", targetName, cd.Namespace, err)
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}
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return nil
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}
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