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store.go
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store.go
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// Copyright 2018 Authors of Cilium
//
// 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 store
import (
"encoding/json"
"path"
"github.com/cilium/cilium/pkg/kvstore"
"github.com/cilium/cilium/pkg/kvstore/store"
"github.com/cilium/cilium/pkg/loadbalancer"
"github.com/cilium/cilium/pkg/lock"
"github.com/cilium/cilium/pkg/logging/logfields"
)
var (
// ServiceStorePrefix is the kvstore prefix of the shared store
//
// WARNING - STABLE API: Changing the structure or values of this will
// break backwards compatibility
ServiceStorePrefix = path.Join(kvstore.BaseKeyPrefix, "state", "services", "v1")
)
// ServiceMerger is the interface to be implemented by the owner of local
// services. The functions have to merge service updates and deletions with
// local services to provide a shared view.
type ServiceMerger interface {
MergeClusterServiceUpdate(service *ClusterService, swg *lock.StoppableWaitGroup)
MergeClusterServiceDelete(service *ClusterService, swg *lock.StoppableWaitGroup)
}
// PortConfiguration is the L4 port configuration of a frontend or backend. The
// map is indexed by the name of the port and the value constains the L4 port
// and protocol.
//
// +deepequal-gen=true
type PortConfiguration map[string]*loadbalancer.L4Addr
// ClusterService is the definition of a service in a cluster
//
// WARNING - STABLE API: Any change to this structure must be done in a
// backwards compatible way.
//
// +k8s:deepcopy-gen=true
type ClusterService struct {
// Cluster is the cluster name the service is configured in
Cluster string `json:"cluster"`
// Namespace is the cluster namespace the service is configured in
Namespace string `json:"namespace"`
// Name is the name of the service. It must be unique within the
// namespace of the cluster
Name string `json:"name"`
// Frontends is a map indexed by the frontend IP address
Frontends map[string]PortConfiguration `json:"frontends"`
// Backends is is map indexed by the backend IP address
Backends map[string]PortConfiguration `json:"backends"`
// Labels are the labels of the service
Labels map[string]string `json:"labels"`
// Selector is the label selector used to select backends
Selector map[string]string `json:"selector"`
}
func (s *ClusterService) String() string {
return s.Cluster + "/" + s.Namespace + "/" + s.Name
}
// NamespaceServiceName returns the namespace and service name
func (s *ClusterService) NamespaceServiceName() string {
return s.Namespace + "/" + s.Name
}
// GetKeyName returns the kvstore key to be used for the global service
func (s *ClusterService) GetKeyName() string {
// WARNING - STABLE API: Changing the structure of the key may break
// backwards compatibility
return path.Join(s.Cluster, s.Namespace, s.Name)
}
// DeepKeyCopy creates a deep copy of the LocalKey
func (s *ClusterService) DeepKeyCopy() store.LocalKey {
return s.DeepCopy()
}
// Marshal returns the global service object as JSON byte slice
func (s *ClusterService) Marshal() ([]byte, error) {
return json.Marshal(s)
}
// Unmarshal parses the JSON byte slice and updates the global service receiver
func (s *ClusterService) Unmarshal(data []byte) error {
newService := NewClusterService("", "")
if err := json.Unmarshal(data, &newService); err != nil {
return err
}
*s = newService
return nil
}
// NewClusterService returns a new cluster service definition
func NewClusterService(name, namespace string) ClusterService {
return ClusterService{
Name: name,
Namespace: namespace,
Frontends: map[string]PortConfiguration{},
Backends: map[string]PortConfiguration{},
Labels: map[string]string{},
Selector: map[string]string{},
}
}
type clusterServiceObserver struct {
// merger is the interface responsible to merge service and
// endpoints into an existing cache
merger ServiceMerger
// swg provides a mechanism to know when the services were synchronized
// with the datapath.
swg *lock.StoppableWaitGroup
}
// OnUpdate is called when a service in a remote cluster is updated
func (c *clusterServiceObserver) OnUpdate(key store.Key) {
if svc, ok := key.(*ClusterService); ok {
scopedLog := log.WithField(logfields.ServiceName, svc.String())
scopedLog.Debugf("Update event of cluster service %#v", svc)
c.merger.MergeClusterServiceUpdate(svc, c.swg)
} else {
log.Warningf("Received unexpected cluster service update object %+v", key)
}
}
// OnDelete is called when a service in a remote cluster is deleted
func (c *clusterServiceObserver) OnDelete(key store.NamedKey) {
if svc, ok := key.(*ClusterService); ok {
scopedLog := log.WithField(logfields.ServiceName, svc.String())
scopedLog.Debugf("Delete event of cluster service %#v", svc)
c.merger.MergeClusterServiceDelete(svc, c.swg)
} else {
log.Warningf("Received unexpected cluster service delete object %+v", key)
}
}
// Configuration is the required configuration for the service store
type Configuration interface {
// LocalClusterName must return the name of the local cluster
LocalClusterName() string
}
// JoinClusterServices starts a controller for syncing services from the kvstore
func JoinClusterServices(merger ServiceMerger, cfg Configuration) {
swg := lock.NewStoppableWaitGroup()
log.Info("Enumerating cluster services")
// JoinSharedStore performs initial sync of services
_, err := store.JoinSharedStore(store.Configuration{
Prefix: path.Join(ServiceStorePrefix, cfg.LocalClusterName()),
KeyCreator: func() store.Key {
return &ClusterService{}
},
Observer: &clusterServiceObserver{
merger: merger,
swg: swg,
},
})
if err != nil {
log.WithError(err).Fatal("Enumerating cluster services failed")
}
swg.Stop()
}