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ingress_gateway.go
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/
ingress_gateway.go
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// Copyright (c) 2020 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package istio
import (
"context"
"path/filepath"
v1alpha1constants "github.com/gardener/gardener/pkg/apis/core/v1alpha1/constants"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/operation/botanist/component"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
networkingv1alpha3 "istio.io/client-go/pkg/apis/networking/v1alpha3"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
crclient "sigs.k8s.io/controller-runtime/pkg/client"
)
type ingress struct {
values *IngressValues
namespace string
kubernetes.ChartApplier
chartPath string
client crclient.Client
}
// IngressValues holds values for the istio-ingress chart.
// The only opened port is 15021.
type IngressValues struct {
TrustDomain string `json:"trustDomain,omitempty"`
Image string `json:"image,omitempty"`
Annotations map[string]string `json:"annotations,omitempty"`
IstiodNamespace string `json:"istiodNamespace,omitempty"`
LoadBalancerIP *string `json:"loadBalancerIP,omitempty"`
Labels map[string]string `json:"labels,omitempty"`
// Ports is a list of all Ports the istio-ingress gateways is listening on.
// Port 15021 and 15000 cannot be used.
Ports []corev1.ServicePort `json:"ports,omitempty"`
}
// NewIngressGateway creates a new DeployWaiter for istio ingress gateway in
// "istio-ingress" namespace.
// It only supports Deploy. Destroy does nothing.
func NewIngressGateway(
values *IngressValues,
namespace string,
applier kubernetes.ChartApplier,
chartsRootPath string,
client crclient.Client,
) component.DeployWaiter {
return &ingress{
values: values,
namespace: namespace,
ChartApplier: applier,
chartPath: filepath.Join(chartsRootPath, istioReleaseName, "istio-ingress"),
client: client,
}
}
func (i *ingress) Deploy(ctx context.Context) error {
// TODO(mvladev): Rotate this on on every istio version upgrade.
for _, filterName := range []string{"tcp-metadata-exchange-1.9", "tcp-metadata-exchange-1.10", "metadata-exchange-1.9", "metadata-exchange-1.10", "tcp-stats-filter-1.9", "stats-filter-1.9"} {
if err := crclient.IgnoreNotFound(i.client.Delete(ctx, &networkingv1alpha3.EnvoyFilter{
ObjectMeta: metav1.ObjectMeta{Name: filterName, Namespace: i.namespace},
})); err != nil {
return err
}
}
if err := i.client.Create(
ctx,
&corev1.Namespace{
ObjectMeta: metav1.ObjectMeta{
Name: i.namespace,
Labels: getIngressGatewayNamespaceLabels(i.values.Labels),
},
},
); kutil.IgnoreAlreadyExists(err) != nil {
return err
}
applierOptions := kubernetes.CopyApplierOptions(kubernetes.DefaultMergeFuncs)
applierOptions[appsv1.SchemeGroupVersion.WithKind("Deployment").GroupKind()] = kubernetes.DeploymentKeepReplicasMergeFunc
return i.Apply(ctx, i.chartPath, i.namespace, istioReleaseName, kubernetes.Values(i.values), applierOptions)
}
func (i *ingress) Destroy(ctx context.Context) error {
// istio cannot be safely removed
return nil
}
func (i *ingress) Wait(ctx context.Context) error {
return nil
}
func (i *ingress) WaitCleanup(ctx context.Context) error {
return nil
}
func getIngressGatewayNamespaceLabels(labels map[string]string) map[string]string {
var namespaceLabels = map[string]string{
"istio-operator-managed": "Reconcile",
"istio-injection": "disabled",
}
if value, ok := labels[v1alpha1constants.GardenRole]; ok && value == v1alpha1constants.GardenRoleExposureClassHandler {
namespaceLabels[v1alpha1constants.GardenRole] = v1alpha1constants.GardenRoleExposureClassHandler
}
if value, ok := labels[v1alpha1constants.LabelExposureClassHandlerName]; ok {
namespaceLabels[v1alpha1constants.LabelExposureClassHandlerName] = value
}
return namespaceLabels
}