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envoyfleet_resources.go
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envoyfleet_resources.go
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/*
MIT License
# Copyright (c) 2022 Kubeshop
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
package controllers
import (
"context"
_ "embed"
"fmt"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"sigs.k8s.io/controller-runtime/pkg/client"
gateway "github.com/kubeshop/kusk-gateway/api/v1alpha1"
"github.com/kubeshop/kusk-gateway/internal/k8sutils"
)
const (
envoyHTTPListenerPort int32 = 8080
envoyAdminListenerPort int32 = 19000
kuskGatewayManagerImageName = "kusk-gateway"
)
var (
// envoyConfigTemplate - contains the contents of `envoy.yaml`.
//go:embed envoy.yaml
envoyConfigTemplate string
)
// EnvoyFleetResources is a collection of related Envoy Fleet K8s resources
type EnvoyFleetResources struct {
client client.Client
fleet *gateway.EnvoyFleet
fleetID string
configMap *corev1.ConfigMap
deployment *appsv1.Deployment
service *corev1.Service
sharedLabels map[string]string
}
func NewEnvoyFleetResources(ctx context.Context, client client.Client, ef *gateway.EnvoyFleet) (*EnvoyFleetResources, error) {
fleetID := gateway.EnvoyFleetID{Name: ef.Name, Namespace: ef.Namespace}.String()
f := &EnvoyFleetResources{
client: client,
fleet: ef,
fleetID: fleetID,
sharedLabels: map[string]string{
"app.kubernetes.io/name": "kusk-gateway-envoy-fleet",
"app.kubernetes.io/managed-by": "kusk-gateway-manager",
"app.kubernetes.io/created-by": "kusk-gateway-manager",
"app.kubernetes.io/part-of": "kusk-gateway",
"app.kubernetes.io/instance": ef.Name,
"fleet": fleetID,
},
}
if err := f.generateConfigMap(ctx); err != nil {
return nil, err
}
// Depends on the ConfigMap
if err := f.generateDeployment(ctx); err != nil {
return nil, err
}
// Depends on the Service
f.generateService()
return f, nil
}
func (e *EnvoyFleetResources) CreateOrUpdate(ctx context.Context) error {
if err := k8sutils.CreateOrReplace(ctx, e.client, e.configMap); err != nil {
return fmt.Errorf("failed to deploy Envoy Fleet config map: %w", err)
}
if err := k8sutils.CreateOrReplace(ctx, e.client, e.deployment); err != nil {
return fmt.Errorf("failed to deploy Envoy Fleet deployment: %w", err)
}
if err := k8sutils.CreateOrReplace(ctx, e.client, e.service); err != nil {
return fmt.Errorf("failed to deploy Envoy Fleet service: %w", err)
}
return nil
}
func (e *EnvoyFleetResources) generateConfigMap(ctx context.Context) error {
// future object labels
labels := map[string]string{
"app.kubernetes.io/component": "envoy-config",
}
// Copy over shared labels map
for key, value := range e.sharedLabels {
labels[key] = value
}
configMapName := e.fleet.Name
xdsLabels := map[string]string{"app.kubernetes.io/name": "kusk-gateway", "app.kubernetes.io/component": "xds-service"}
xdsServices, err := k8sutils.GetServicesByLabels(ctx, e.client, xdsLabels)
if err != nil {
return fmt.Errorf("cannot create Envoy Fleet %s config map: %w", e.fleet.Name, err)
}
switch svcs := len(xdsServices); {
case svcs == 0:
return fmt.Errorf("cannot create Envoy Fleet %s config map: no xds services detected in the cluster when searching with the labels %s", e.fleet.Name, xdsLabels)
case svcs > 1:
return fmt.Errorf("cannot create Envoy Fleet %s config map: multiple xds services detected in the cluster when searching with the labels %s", e.fleet.Name, xdsLabels)
}
// At this point - we have exactly one service with (we ASSUME!) one port
xdsServiceHostname := fmt.Sprintf("%s.%s.svc.cluster.local.", xdsServices[0].Name, xdsServices[0].Namespace)
xdsServicePort := xdsServices[0].Spec.Ports[0].Port
e.configMap = &corev1.ConfigMap{
TypeMeta: metav1.TypeMeta{
Kind: "ConfigMap",
APIVersion: "v1",
},
ObjectMeta: metav1.ObjectMeta{
Name: configMapName,
Namespace: e.fleet.Namespace,
Labels: labels,
OwnerReferences: []metav1.OwnerReference{envoyFleetAsOwner(e.fleet)},
},
Data: map[string]string{
"envoy-config.yaml": fmt.Sprintf(envoyConfigTemplate, e.fleetID, xdsServiceHostname, xdsServicePort),
},
}
return nil
}
func (e *EnvoyFleetResources) generateDeployment(ctx context.Context) error {
// future object labels
labels := map[string]string{
"app.kubernetes.io/component": "envoy",
}
// Copy over shared labels map
for key, value := range e.sharedLabels {
labels[key] = value
}
deploymentName := e.fleet.Name
configMapName := e.configMap.Name
// Create container template first
envoyContainer := corev1.Container{
Name: "envoy",
Image: e.fleet.Spec.Image,
ImagePullPolicy: corev1.PullIfNotPresent,
Command: []string{"/bin/sh", "-c"},
Args: []string{
"envoy -c /etc/envoy/envoy.yaml --service-node $POD_NAME",
},
Env: []corev1.EnvVar{
{
Name: "POD_NAME",
ValueFrom: &corev1.EnvVarSource{
FieldRef: &corev1.ObjectFieldSelector{
FieldPath: "metadata.name",
},
},
},
},
VolumeMounts: []corev1.VolumeMount{
{
Name: "envoy-config",
MountPath: "/etc/envoy/envoy.yaml",
SubPath: "envoy-config.yaml",
},
},
Ports: []corev1.ContainerPort{
{
Name: "http",
ContainerPort: envoyHTTPListenerPort,
},
{
Name: "admin",
ContainerPort: envoyAdminListenerPort,
},
},
}
// Set Enovy Pod Resources if specified
if e.fleet.Spec.Resources != nil {
if e.fleet.Spec.Resources.Limits != nil {
envoyContainer.Resources.Limits = e.fleet.Spec.Resources.Limits
}
if e.fleet.Spec.Resources.Requests != nil {
envoyContainer.Resources.Requests = e.fleet.Spec.Resources.Requests
}
}
// Create the deployment
e.deployment = &appsv1.Deployment{
TypeMeta: metav1.TypeMeta{
Kind: "Deployment",
APIVersion: "apps/v1",
},
ObjectMeta: metav1.ObjectMeta{
Name: deploymentName,
Namespace: e.fleet.Namespace,
Labels: labels,
OwnerReferences: []metav1.OwnerReference{envoyFleetAsOwner(e.fleet)},
},
Spec: appsv1.DeploymentSpec{
Replicas: e.fleet.Spec.Size,
Selector: labelSelectors(labels),
Template: corev1.PodTemplateSpec{
ObjectMeta: metav1.ObjectMeta{
Labels: labels,
Annotations: e.fleet.Spec.Annotations,
},
Spec: corev1.PodSpec{
Containers: []corev1.Container{
envoyContainer,
},
Volumes: []corev1.Volume{
{
Name: "envoy-config",
VolumeSource: corev1.VolumeSource{
ConfigMap: &corev1.ConfigMapVolumeSource{
LocalObjectReference: corev1.LocalObjectReference{
Name: configMapName,
},
},
},
},
},
NodeSelector: e.fleet.Spec.NodeSelector,
Affinity: e.fleet.Spec.Affinity,
Tolerations: e.fleet.Spec.Tolerations,
TerminationGracePeriodSeconds: e.fleet.Spec.TerminationGracePeriodSeconds,
},
},
},
}
return nil
}
func (e *EnvoyFleetResources) generateService() {
// future object labels
labels := map[string]string{
"app.kubernetes.io/component": "envoy-svc",
}
// Copy over shared labels map
for key, value := range e.sharedLabels {
labels[key] = value
}
serviceName := e.fleet.Name
e.service = &corev1.Service{
TypeMeta: metav1.TypeMeta{
Kind: "Service",
APIVersion: "v1",
},
ObjectMeta: metav1.ObjectMeta{
Name: serviceName,
Namespace: e.fleet.Namespace,
Labels: labels,
Annotations: e.fleet.Spec.Service.Annotations,
OwnerReferences: []metav1.OwnerReference{envoyFleetAsOwner(e.fleet)},
},
Spec: corev1.ServiceSpec{
Ports: e.fleet.Spec.Service.Ports,
Selector: e.deployment.Spec.Selector.MatchLabels,
Type: e.fleet.Spec.Service.Type,
},
}
// Static IP address for the LoadBalancer
if e.fleet.Spec.Service.Type == corev1.ServiceTypeLoadBalancer && e.fleet.Spec.Service.LoadBalancerIP != "" {
e.service.Spec.LoadBalancerIP = e.fleet.Spec.Service.LoadBalancerIP
}
if e.fleet.Spec.Service.ExternalTrafficPolicy != "" {
e.service.Spec.ExternalTrafficPolicy = e.fleet.Spec.Service.ExternalTrafficPolicy
}
}
func envoyFleetAsOwner(cr *gateway.EnvoyFleet) metav1.OwnerReference {
trueVar := true
return metav1.OwnerReference{
APIVersion: cr.APIVersion,
Kind: cr.Kind,
Name: cr.Name,
UID: cr.UID,
Controller: &trueVar,
}
}
func labelSelectors(labels map[string]string) *metav1.LabelSelector {
return &metav1.LabelSelector{MatchLabels: labels}
}