mirror of
https://github.com/fluxcd/flagger.git
synced 2026-03-02 17:51:00 +00:00
278 lines
8.1 KiB
Go
278 lines
8.1 KiB
Go
/*
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Copyright 2020 The Flux authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package router
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import (
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"context"
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"fmt"
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gloov1 "github.com/fluxcd/flagger/pkg/apis/gloo/v1"
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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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"go.uber.org/zap"
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"k8s.io/apimachinery/pkg/api/errors"
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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/client-go/kubernetes"
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flaggerv1 "github.com/fluxcd/flagger/pkg/apis/flagger/v1beta1"
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clientset "github.com/fluxcd/flagger/pkg/client/clientset/versioned"
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)
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// GlooRouter is managing Gloo route tables
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type GlooRouter struct {
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kubeClient kubernetes.Interface
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glooClient clientset.Interface
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flaggerClient clientset.Interface
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logger *zap.SugaredLogger
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upstreamDiscoveryNs string
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}
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// Reconcile creates or updates the Gloo Edge route table
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func (gr *GlooRouter) Reconcile(canary *flaggerv1.Canary) error {
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apexName, _, _ := canary.GetServiceNames()
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canaryName := fmt.Sprintf("%s-%s-canary-%v", canary.Namespace, apexName, canary.Spec.Service.Port)
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primaryName := fmt.Sprintf("%s-%s-primary-%v", canary.Namespace, apexName, canary.Spec.Service.Port)
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newSpec := gloov1.RouteTableSpec{
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Routes: []gloov1.Route{
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{
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InheritablePathMatchers: true,
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Matchers: getMatchers(canary),
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Action: gloov1.RouteAction{
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Destination: gloov1.MultiDestination{
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Destinations: []gloov1.WeightedDestination{
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{
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Destination: gloov1.Destination{
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Upstream: gloov1.ResourceRef{
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Name: primaryName,
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Namespace: gr.upstreamDiscoveryNs,
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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: gloov1.Destination{
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Upstream: gloov1.ResourceRef{
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Name: canaryName,
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Namespace: gr.upstreamDiscoveryNs,
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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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},
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},
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},
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},
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}
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routeTable, err := gr.glooClient.GatewayV1().RouteTables(canary.Namespace).Get(context.TODO(), apexName, metav1.GetOptions{})
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if errors.IsNotFound(err) {
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routeTable = &gloov1.RouteTable{
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ObjectMeta: metav1.ObjectMeta{
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Name: apexName,
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Namespace: canary.Namespace,
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OwnerReferences: []metav1.OwnerReference{
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*metav1.NewControllerRef(canary, 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 = gr.glooClient.GatewayV1().RouteTables(canary.Namespace).Create(context.TODO(), routeTable, metav1.CreateOptions{})
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if err != nil {
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return fmt.Errorf("RouteTable %s.%s create error: %w", apexName, canary.Namespace, err)
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}
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gr.logger.With("canary", fmt.Sprintf("%s.%s", canary.Name, canary.Namespace)).
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Infof("RouteTable %s.%s created", routeTable.GetName(), canary.Namespace)
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return nil
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} else if err != nil {
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return fmt.Errorf("RouteTable %s.%s get query error: %w", apexName, canary.Namespace, err)
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}
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// update routeTable but keep the original destination weights
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if routeTable != nil {
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if diff := cmp.Diff(
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newSpec,
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routeTable.Spec,
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cmpopts.IgnoreFields(gloov1.WeightedDestination{}, "Weight"),
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); diff != "" {
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clone := routeTable.DeepCopy()
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clone.Spec = newSpec
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_, err = gr.glooClient.GatewayV1().RouteTables(canary.Namespace).Update(context.TODO(), clone, metav1.UpdateOptions{})
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if err != nil {
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return fmt.Errorf("RouteTable %s.%s update error: %w", apexName, canary.Namespace, err)
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}
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gr.logger.With("canary", fmt.Sprintf("%s.%s", canary.Name, canary.Namespace)).
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Infof("RouteTable %s.%s updated", routeTable.GetName(), canary.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 (gr *GlooRouter) GetRoutes(canary *flaggerv1.Canary) (
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primaryWeight int,
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canaryWeight int,
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mirrored bool,
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err error,
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) {
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apexName := canary.Spec.TargetRef.Name
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primaryName := fmt.Sprintf("%s-%s-primary-%v", canary.Namespace, canary.Spec.TargetRef.Name, canary.Spec.Service.Port)
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routeTable, err := gr.glooClient.GatewayV1().RouteTables(canary.Namespace).Get(context.TODO(), apexName, metav1.GetOptions{})
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if err != nil {
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err = fmt.Errorf("RouteTable %s.%s get query error: %w", apexName, canary.Namespace, err)
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return
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}
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if len(routeTable.Spec.Routes[0].Action.Destination.Destinations) < 2 {
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err = fmt.Errorf("RouteTable %s.%s destinations not found", apexName, canary.Namespace)
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return
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}
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for _, dst := range routeTable.Spec.Routes[0].Action.Destination.Destinations {
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if dst.Destination.Upstream.Name == primaryName {
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primaryWeight = int(dst.Weight)
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canaryWeight = 100 - primaryWeight
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return
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}
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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 (gr *GlooRouter) SetRoutes(
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canary *flaggerv1.Canary,
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primaryWeight int,
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canaryWeight int,
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_ bool,
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) error {
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apexName, _, _ := canary.GetServiceNames()
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canaryName := fmt.Sprintf("%s-%s-canary-%v", canary.Namespace, apexName, canary.Spec.Service.Port)
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primaryName := fmt.Sprintf("%s-%s-primary-%v", canary.Namespace, apexName, canary.Spec.Service.Port)
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if primaryWeight == 0 && canaryWeight == 0 {
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return fmt.Errorf("RoutingRule %s.%s update failed: no valid weights", apexName, canary.Namespace)
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}
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routeTable, err := gr.glooClient.GatewayV1().RouteTables(canary.Namespace).Get(context.TODO(), apexName, metav1.GetOptions{})
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if err != nil {
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return fmt.Errorf("RouteTable %s.%s query error: %w", apexName, canary.Namespace, err)
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}
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routeTable.Spec = gloov1.RouteTableSpec{
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Routes: []gloov1.Route{
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{
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InheritablePathMatchers: true,
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Matchers: getMatchers(canary),
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Action: gloov1.RouteAction{
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Destination: gloov1.MultiDestination{
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Destinations: []gloov1.WeightedDestination{
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{
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Destination: gloov1.Destination{
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Upstream: gloov1.ResourceRef{
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Name: primaryName,
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Namespace: gr.upstreamDiscoveryNs,
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},
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},
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Weight: uint32(primaryWeight),
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},
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{
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Destination: gloov1.Destination{
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Upstream: gloov1.ResourceRef{
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Name: canaryName,
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Namespace: gr.upstreamDiscoveryNs,
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},
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},
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Weight: uint32(canaryWeight),
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},
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},
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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 = gr.glooClient.GatewayV1().RouteTables(canary.Namespace).Update(context.TODO(), routeTable, metav1.UpdateOptions{})
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if err != nil {
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return fmt.Errorf("RouteTable %s.%s update error: %w", apexName, canary.Namespace, err)
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}
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return nil
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}
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func (gr *GlooRouter) Finalize(_ *flaggerv1.Canary) error {
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return nil
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}
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func getMatchers(canary *flaggerv1.Canary) []gloov1.Matcher {
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headerMatchers := getHeaderMatchers(canary)
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methods := getMethods(canary)
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if len(headerMatchers) == 0 && len(methods) == 0 {
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return nil
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}
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return []gloov1.Matcher{
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{
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Headers: headerMatchers,
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Methods: methods,
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},
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}
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}
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func getHeaderMatchers(canary *flaggerv1.Canary) []gloov1.HeaderMatcher {
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var headerMatchers []gloov1.HeaderMatcher
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for _, match := range canary.GetAnalysis().Match {
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for s, stringMatch := range match.Headers {
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h := gloov1.HeaderMatcher{
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Name: s,
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Value: stringMatch.Exact,
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}
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if stringMatch.Regex != "" {
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h = gloov1.HeaderMatcher{
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Name: s,
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Value: stringMatch.Regex,
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Regex: true,
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}
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}
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headerMatchers = append(headerMatchers, h)
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}
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}
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return headerMatchers
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}
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func getMethods(canary *flaggerv1.Canary) []string {
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var methods []string
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for _, match := range canary.GetAnalysis().Match {
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if stringMatch := match.Method; stringMatch != nil {
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methods = append(methods, stringMatch.Exact)
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}
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}
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return methods
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}
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