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caches.go
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/
caches.go
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/*
Copyright 2020 The Knative Authors
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 generator
import (
"github.com/3scale/kourier/pkg/envoy"
"go.uber.org/zap"
"github.com/golang/protobuf/ptypes/wrappers"
v2 "github.com/envoyproxy/go-control-plane/envoy/api/v2"
route "github.com/envoyproxy/go-control-plane/envoy/api/v2/route"
"github.com/envoyproxy/go-control-plane/pkg/cache"
"github.com/google/uuid"
log "github.com/sirupsen/logrus"
kubeclient "k8s.io/client-go/kubernetes"
"knative.dev/serving/pkg/apis/networking/v1alpha1"
)
type Caches struct {
ingresses map[string]*v1alpha1.Ingress
translatedIngresses map[string]*translatedIngress
clusters *ClustersCache
clustersToIngress map[string][]string
routeConfig []v2.RouteConfiguration
listeners []*v2.Listener
statusVirtualHost *route.VirtualHost
logger *zap.SugaredLogger
}
func NewCaches(logger *zap.SugaredLogger) *Caches {
return &Caches{
ingresses: make(map[string]*v1alpha1.Ingress),
translatedIngresses: make(map[string]*translatedIngress),
clusters: newClustersCache(logger.Named("cluster-cache")),
clustersToIngress: make(map[string][]string),
logger: logger,
}
}
func (caches *Caches) GetIngress(ingressName, ingressNamespace string) *v1alpha1.Ingress {
caches.logger.Debugf("getting ingress: %s/%s", ingressName, ingressNamespace)
return caches.ingresses[mapKey(ingressName, ingressNamespace)]
}
func (caches *Caches) AddTranslatedIngress(ingress *v1alpha1.Ingress, translatedIngress *translatedIngress) {
caches.logger.Debugf("adding ingress: %s/%s", ingress.Name, ingress.Namespace)
key := mapKey(ingress.Name, ingress.Namespace)
caches.ingresses[key] = ingress
caches.translatedIngresses[key] = translatedIngress
for _, cluster := range translatedIngress.clusters {
caches.AddClusterForIngress(cluster, ingress.Name, ingress.Namespace)
}
}
// SetOnEvicted allows to set a function that will be executed when any key on the cache expires.
func (caches *Caches) SetOnEvicted(f func(string, interface{})) {
caches.clusters.clusters.OnEvicted(f)
}
func (caches *Caches) AddStatusVirtualHost() {
var ingresses []*v1alpha1.Ingress
for _, val := range caches.ingresses {
ingresses = append(ingresses, val)
}
statusVirtualHost := statusVHost(ingresses)
caches.statusVirtualHost = &statusVirtualHost
}
func (caches *Caches) SetListeners(kubeclient kubeclient.Interface) error {
localVHosts := append(caches.clusterLocalVirtualHosts(), caches.statusVirtualHost)
listeners, err := listenersFromVirtualHosts(
caches.externalVirtualHosts(),
localVHosts,
caches.sniMatches(),
kubeclient,
caches,
)
if err != nil {
return err
}
caches.listeners = listeners
return nil
}
func (caches *Caches) ToEnvoySnapshot() (cache.Snapshot, error) {
caches.logger.Debugf("Preparing Envoy Snapshot")
// Instead of sending the Routes, we send the RouteConfigs.
routes := make([]cache.Resource, len(caches.routeConfig))
for i := range caches.routeConfig {
// Without this we can generate routes that point to non-existing clusters
// That causes some "no_cluster" errors in Envoy and the "TestUpdate"
// in the Knative serving test suite fails sometimes.
// Ref: https://github.com/knative/serving/blob/f6da03e5dfed78593c4f239c3c7d67c5d7c55267/test/conformance/ingress/update_test.go#L37
caches.routeConfig[i].ValidateClusters = &wrappers.BoolValue{Value: true}
caches.logger.Debugf("Adding Route %#v", &caches.routeConfig[i])
routes[i] = &caches.routeConfig[i]
}
listeners := make([]cache.Resource, len(caches.listeners))
for i := range caches.listeners {
caches.logger.Debugf("Adding listener %#v", caches.listeners[i])
listeners[i] = caches.listeners[i]
}
// Generate and append the internal kourier route for keeping track of the snapshot id deployed
// to each envoy
snapshotVersion, err := caches.getNewSnapshotVersion()
if err != nil {
log.Errorf("Failed generating a new Snapshot version: %s", err)
return cache.Snapshot{}, err
}
return cache.NewSnapshot(
snapshotVersion,
make([]cache.Resource, 0),
caches.clusters.list(),
routes,
listeners,
make([]cache.Resource, 0),
), nil
}
// Note: changes the snapshot version of the caches object
// Notice that the clusters are not deleted. That's handled with the expiration
// time set in the "ClustersCache" struct.
func (caches *Caches) DeleteIngressInfo(ingressName string, ingressNamespace string,
kubeclient kubeclient.Interface) error {
var err error
caches.deleteTranslatedIngress(ingressName, ingressNamespace)
newExternalVirtualHosts := caches.externalVirtualHosts()
newClusterLocalVirtualHosts := caches.clusterLocalVirtualHosts()
var ingresses []*v1alpha1.Ingress
for _, val := range caches.ingresses {
ingresses = append(ingresses, val)
}
statusVirtualHost := statusVHost(ingresses)
newClusterLocalVirtualHosts = append(newClusterLocalVirtualHosts, &statusVirtualHost)
// We now need the cache in the listenersFromVirtualHosts.
caches.listeners, err = listenersFromVirtualHosts(
newExternalVirtualHosts,
newClusterLocalVirtualHosts,
caches.sniMatches(),
kubeclient,
caches,
)
if err != nil {
return err
}
return nil
}
func (caches *Caches) deleteTranslatedIngress(ingressName, ingressNamespace string) {
caches.logger.Debugf("deleting ingress: %s/%s", ingressName, ingressNamespace)
key := mapKey(ingressName, ingressNamespace)
// Set to expire all the clusters belonging to that Ingress.
clusters := caches.clustersToIngress[key]
for _, cluster := range clusters {
caches.clusters.setExpiration(cluster, ingressName, ingressNamespace)
}
delete(caches.ingresses, key)
delete(caches.translatedIngresses, key)
delete(caches.clustersToIngress, key)
}
func (caches *Caches) AddClusterForIngress(cluster *v2.Cluster, ingressName string, ingressNamespace string) {
caches.logger.Debugf("adding cluster %s for ingress %s/%s", cluster.Name, ingressName, ingressNamespace)
caches.clusters.set(cluster, ingressName, ingressNamespace)
key := mapKey(ingressName, ingressNamespace)
caches.clustersToIngress[key] = append(
caches.clustersToIngress[key],
cluster.Name,
)
}
func (caches *Caches) getNewSnapshotVersion() (string, error) {
snapshotVersion, err := uuid.NewUUID()
if err != nil {
return "", err
}
return snapshotVersion.String(), nil
}
func (caches *Caches) externalVirtualHosts() []*route.VirtualHost {
var res []*route.VirtualHost
for _, translatedIngress := range caches.translatedIngresses {
res = append(res, translatedIngress.externalVirtualHosts...)
}
return res
}
func (caches *Caches) clusterLocalVirtualHosts() []*route.VirtualHost {
var res []*route.VirtualHost
for _, translatedIngress := range caches.translatedIngresses {
res = append(res, translatedIngress.internalVirtualHosts...)
}
return res
}
func (caches *Caches) sniMatches() []*envoy.SNIMatch {
var res []*envoy.SNIMatch
for _, translatedIngress := range caches.translatedIngresses {
res = append(res, translatedIngress.sniMatches...)
}
return res
}
func mapKey(ingressName string, ingressNamespace string) string {
return ingressNamespace + "/" + ingressName
}