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service_cache.go
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service_cache.go
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// Copyright 2018-2019 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 k8s
import (
"net"
"github.com/cilium/cilium/pkg/k8s/types"
"github.com/cilium/cilium/pkg/loadbalancer"
"github.com/cilium/cilium/pkg/lock"
"github.com/cilium/cilium/pkg/logging/logfields"
"github.com/cilium/cilium/pkg/option"
"github.com/cilium/cilium/pkg/service"
"github.com/davecgh/go-spew/spew"
"github.com/sirupsen/logrus"
)
// CacheAction is the type of action that was performed on the cache
type CacheAction int
const (
// UpdateService reflects that the service was updated or added
UpdateService CacheAction = iota
// DeleteService reflects that the service was deleted
DeleteService
// UpdateIngress reflects that the ingress was updated or added
UpdateIngress
// DeleteIngress reflects that the ingress was deleted
DeleteIngress
)
// String returns the cache action as a string
func (c CacheAction) String() string {
switch c {
case UpdateService:
return "service-updated"
case DeleteService:
return "service-deleted"
case UpdateIngress:
return "ingress-updated"
case DeleteIngress:
return "ingress-deleted"
default:
return "unknown"
}
}
// ServiceEvent is emitted via the Events channel of ServiceCache and describes
// the change that occurred in the cache
type ServiceEvent struct {
// Action is the action that was performed in the cache
Action CacheAction
// ID is the identified of the service
ID ServiceID
// Service is the service structure
Service *Service
// Endpoints is the endpoints structured correlated with the service
Endpoints *Endpoints
}
// ServiceCache is a list of services and ingresses correlated with the
// matching endpoints. The Events member will receive events as services and
// ingresses
type ServiceCache struct {
Events chan ServiceEvent
// mutex protects the maps below including the concurrent access of each
// value.
mutex lock.RWMutex
services map[ServiceID]*Service
endpoints map[ServiceID]*Endpoints
ingresses map[ServiceID]*Service
// externalEndpoints is a list of additional service backends derived from source other than the local cluster
externalEndpoints map[ServiceID]externalEndpoints
}
// NewServiceCache returns a new ServiceCache
func NewServiceCache() ServiceCache {
return ServiceCache{
services: map[ServiceID]*Service{},
endpoints: map[ServiceID]*Endpoints{},
ingresses: map[ServiceID]*Service{},
externalEndpoints: map[ServiceID]externalEndpoints{},
Events: make(chan ServiceEvent, 128),
}
}
// GetRandomBackendIP returns a random L3n4Addr that is backing the given Service ID.
func (s *ServiceCache) GetRandomBackendIP(svcID ServiceID) *loadbalancer.L3n4Addr {
s.mutex.RLock()
defer s.mutex.RUnlock()
svc := s.services[svcID]
if svc == nil {
return nil
}
for _, port := range svc.Ports {
return loadbalancer.NewL3n4Addr(port.Protocol, svc.FrontendIP, port.Port)
}
return nil
}
// UpdateService parses a Kubernetes service and adds or updates it in the
// ServiceCache. Returns the ServiceID unless the Kubernetes service could not
// be parsed and a bool to indicate whether the service was changed in the
// cache or not.
func (s *ServiceCache) UpdateService(k8sSvc *types.Service) ServiceID {
var (
externalServiceReady bool
externalK8sEndpoints *Endpoints
)
svcID, newService := ParseService(k8sSvc)
if newService == nil {
return svcID
}
s.mutex.Lock()
defer s.mutex.Unlock()
oldService, ok := s.services[svcID]
if ok && oldService.DeepEquals(newService) {
return svcID
}
// If the new service has received externalIPs then we need to check
// if it previously existed without externalIPs or vice-versa.
oldSvcID := svcID
if newService.IsK8sExternal() {
oldSvcID.k8sExternal = false
} else {
oldSvcID.k8sExternal = true
}
oldService, ok = s.services[oldSvcID]
s.services[svcID] = newService
if ok {
switch {
// Get old external services
case oldService.IsK8sExternal() && !newService.IsK8sExternal():
delete(s.endpoints, oldSvcID)
delete(s.services, oldSvcID)
// We want to get any correlation for the service if there are
// normal k8s endpoints running
endpoints, serviceReady := s.correlateEndpoints(svcID)
event := ServiceEvent{
Action: DeleteService,
ID: svcID,
Service: newService,
Endpoints: endpoints,
}
if serviceReady {
event.Action = UpdateService
}
s.Events <- event
return svcID
case !oldService.IsK8sExternal() && newService.IsK8sExternal():
}
}
if newService.IsK8sExternal() {
s.endpoints[svcID] = newService.K8sExternalIPs
// correlate external IPs with the service
externalK8sEndpoints, externalServiceReady = s.correlateEndpoints(svcID)
// We also need to store the svcID as non external so that k8s endpoints
// of this service can be correlated
svcID.k8sExternal = false
s.services[svcID] = newService
}
// Check if the corresponding k8s endpoints resource is already available
endpoints, serviceReady := s.correlateEndpoints(svcID)
svcID.k8sExternal = newService.IsK8sExternal()
if serviceReady || externalServiceReady {
s.Events <- ServiceEvent{
Action: UpdateService,
ID: svcID,
Service: newService,
Endpoints: endpoints.Merge(externalK8sEndpoints),
}
}
return svcID
}
// DeleteService parses a Kubernetes service and removes it from the
// ServiceCache
func (s *ServiceCache) DeleteService(k8sSvc *types.Service) {
svcID := ParseServiceID(k8sSvc)
s.mutex.Lock()
defer s.mutex.Unlock()
oldSvc, oldSvcOk := s.services[svcID]
oldEndpoints, _ := s.correlateEndpoints(svcID)
delete(s.services, svcID)
if svcID.k8sExternal {
// We will delete the external endpoints created in the service addition
delete(s.endpoints, svcID)
svcID.k8sExternal = false
oldNonExternalSvc, oldNonExternalSvcOk := s.services[svcID]
oldNonExternalEndpoints, _ := s.correlateEndpoints(svcID)
delete(s.services, svcID)
svcID.k8sExternal = true
if oldNonExternalSvcOk {
s.Events <- ServiceEvent{
Action: DeleteService,
ID: svcID,
Service: oldNonExternalSvc,
Endpoints: oldNonExternalEndpoints.Merge(oldEndpoints),
}
}
return
}
if oldSvcOk {
s.Events <- ServiceEvent{
Action: DeleteService,
ID: svcID,
Service: oldSvc,
Endpoints: oldEndpoints,
}
}
}
// UpdateEndpoints parses a Kubernetes endpoints and adds or updates it in the
// ServiceCache. Returns the ServiceID unless the Kubernetes endpoints could not
// be parsed and a bool to indicate whether the endpoints was changed in the
// cache or not.
func (s *ServiceCache) UpdateEndpoints(k8sEndpoints *types.Endpoints) (ServiceID, *Endpoints) {
svcID, newEndpoints := ParseEndpoints(k8sEndpoints)
s.mutex.Lock()
defer s.mutex.Unlock()
if oldEndpoints, ok := s.endpoints[svcID]; ok {
if oldEndpoints.DeepEquals(newEndpoints) {
return svcID, newEndpoints
}
}
s.endpoints[svcID] = newEndpoints
// We need to take into account services with external IPs
var externalK8sEndpoints *Endpoints
svcID.k8sExternal = true
externalSvc, isExternal := s.services[svcID]
if isExternal {
externalK8sEndpoints, _ = s.correlateEndpoints(svcID)
}
// If no external IPs were found then we need to set it back to
// k8sExternal to false so we keep original behavior of services without
// external IPs.
svcID.k8sExternal = false
service, ok := s.services[svcID]
endpoints, serviceReady := s.correlateEndpoints(svcID)
// If it is external then we will set as it is external to the events
// channel.
if isExternal {
svcID.k8sExternal = true
service = externalSvc
}
// Only send a service update if we have normal k8s endpoints correlation
// with the service. K8s correlation update was already made when the
// service was added.
if ok && serviceReady {
s.Events <- ServiceEvent{
Action: UpdateService,
ID: svcID,
Service: service,
Endpoints: endpoints.Merge(externalK8sEndpoints),
}
}
return svcID, newEndpoints
}
// DeleteEndpoints parses a Kubernetes endpoints and removes it from the
// ServiceCache
func (s *ServiceCache) DeleteEndpoints(k8sEndpoints *types.Endpoints) ServiceID {
svcID := ParseEndpointsID(k8sEndpoints)
s.mutex.Lock()
defer s.mutex.Unlock()
service, serviceOK := s.services[svcID]
delete(s.endpoints, svcID)
endpoints, serviceReady := s.correlateEndpoints(svcID)
svcID.k8sExternal = true
externalService, externalServiceOK := s.services[svcID]
svcID.k8sExternal = externalServiceOK
var externalServiceReady bool
if externalServiceOK {
endpoints, externalServiceReady = s.correlateEndpoints(svcID)
service = externalService
}
if serviceOK {
event := ServiceEvent{
Action: DeleteService,
ID: svcID,
Service: service,
Endpoints: endpoints,
}
if serviceReady || externalServiceReady {
event.Action = UpdateService
}
s.Events <- event
}
return svcID
}
// UpdateIngress parses a Kubernetes ingress and adds or updates it in the
// ServiceCache.
func (s *ServiceCache) UpdateIngress(ingress *types.Ingress, host net.IP) (ServiceID, error) {
svcID, newService, err := ParseIngress(ingress, host)
if err != nil {
return svcID, err
}
s.mutex.Lock()
defer s.mutex.Unlock()
if oldService, ok := s.ingresses[svcID]; ok {
if oldService.DeepEquals(newService) {
return svcID, nil
}
}
s.ingresses[svcID] = newService
s.Events <- ServiceEvent{
Action: UpdateIngress,
ID: svcID,
Service: newService,
}
return svcID, nil
}
// DeleteIngress parses a Kubernetes ingress and removes it from the
// ServiceCache
func (s *ServiceCache) DeleteIngress(ingress *types.Ingress) {
svcID := ParseIngressID(ingress)
s.mutex.Lock()
defer s.mutex.Unlock()
oldService, ok := s.ingresses[svcID]
endpoints := s.endpoints[svcID]
delete(s.ingresses, svcID)
if ok {
s.Events <- ServiceEvent{
Action: DeleteIngress,
ID: svcID,
Service: oldService,
Endpoints: endpoints,
}
}
}
// FrontendList is the list of all k8s service frontends
type FrontendList map[string]struct{}
// LooseMatch returns true if the provided frontend is found in the
// FrontendList. If the frontend has a protocol value set, it only matches a
// k8s service with a matching protocol. If no protocol is set, any k8s service
// matching frontend IP and port is considered a match, regardless of protocol.
func (l FrontendList) LooseMatch(frontend loadbalancer.L3n4Addr) (exists bool) {
switch frontend.Protocol {
case loadbalancer.NONE:
for _, protocol := range loadbalancer.AllProtocols {
frontend.Protocol = protocol
_, exists = l[frontend.StringWithProtocol()]
if exists {
return
}
}
// If the protocol is set, perform an exact match
default:
_, exists = l[frontend.StringWithProtocol()]
}
return
}
// UniqueServiceFrontends returns all services known to the service cache as a
// map, indexed by the string representation of a loadbalancer.L3n4Addr
func (s *ServiceCache) UniqueServiceFrontends() FrontendList {
uniqueFrontends := FrontendList{}
s.mutex.RLock()
defer s.mutex.RUnlock()
for _, svc := range s.services {
for _, p := range svc.Ports {
address := loadbalancer.L3n4Addr{
IP: svc.FrontendIP,
L4Addr: *p.L4Addr,
}
uniqueFrontends[address.StringWithProtocol()] = struct{}{}
}
for _, nodePortFEs := range svc.NodePorts {
for _, fe := range nodePortFEs {
uniqueFrontends[fe.StringWithProtocol()] = struct{}{}
}
}
}
return uniqueFrontends
}
// correlateEndpoints builds a combined Endpoints of the local endpoints and
// all external endpoints if the service is marked as a global service. Also
// returns a boolean that indicates whether the service is ready to be plumbed,
// this is true if:
// IF If ta local endpoints resource is present. Regardless whether the
// endpoints resource contains actual backends or not.
// OR Remote endpoints exist which correlate to the service.
func (s *ServiceCache) correlateEndpoints(id ServiceID) (*Endpoints, bool) {
endpoints := newEndpoints()
localEndpoints, hasLocalEndpoints := s.endpoints[id]
if hasLocalEndpoints {
for ip, e := range localEndpoints.Backends {
endpoints.Backends[ip] = e
}
}
svc, hasExternalService := s.services[id]
if hasExternalService && svc.IncludeExternal {
externalEndpoints, hasExternalEndpoints := s.externalEndpoints[id]
if hasExternalEndpoints {
for clusterName, remoteClusterEndpoints := range externalEndpoints.endpoints {
if clusterName == option.Config.ClusterName {
continue
}
for ip, e := range remoteClusterEndpoints.Backends {
if _, ok := endpoints.Backends[ip]; ok {
log.WithFields(logrus.Fields{
logfields.K8sSvcName: id.Name,
logfields.K8sNamespace: id.Namespace,
logfields.IPAddr: ip,
"cluster": clusterName,
}).Warning("Conflicting service backend IP")
} else {
endpoints.Backends[ip] = e
}
}
}
}
}
// Report the service as ready if a local endpoints object exists or if
// external endpoints have have been identified
return endpoints, hasLocalEndpoints || len(endpoints.Backends) > 0
}
// MergeExternalServiceUpdate merges a cluster service of a remote cluster into
// the local service cache. The service endpoints are stored as external endpoints
// and are correlated on demand with local services via correlateEndpoints().
func (s *ServiceCache) MergeExternalServiceUpdate(service *service.ClusterService) {
id := ServiceID{Name: service.Name, Namespace: service.Namespace}
scopedLog := log.WithFields(logrus.Fields{logfields.ServiceName: service.String()})
// Ignore updates of own cluster
if service.Cluster == option.Config.ClusterName {
scopedLog.Debug("Not merging external service. Own cluster")
return
}
s.mutex.Lock()
defer s.mutex.Unlock()
externalEndpoints, ok := s.externalEndpoints[id]
if !ok {
externalEndpoints = newExternalEndpoints()
s.externalEndpoints[id] = externalEndpoints
}
scopedLog.Debugf("Updating backends to %+v", service.Backends)
externalEndpoints.endpoints[service.Cluster] = &Endpoints{
Backends: service.Backends,
}
svc, ok := s.services[id]
endpoints, serviceReady := s.correlateEndpoints(id)
// Only send event notification if service is shared and ready.
// External endpoints are still tracked but correlation will not happen
// until the service is marked as shared.
if ok && svc.Shared && serviceReady {
s.Events <- ServiceEvent{
Action: UpdateService,
ID: id,
Service: svc,
Endpoints: endpoints,
}
}
}
// MergeExternalServiceDelete merges the deletion of a cluster service in a
// remote cluster into the local service cache. The service endpoints are
// stored as external endpoints and are correlated on demand with local
// services via correlateEndpoints().
func (s *ServiceCache) MergeExternalServiceDelete(service *service.ClusterService) {
scopedLog := log.WithFields(logrus.Fields{logfields.ServiceName: service.String()})
id := ServiceID{Name: service.Name, Namespace: service.Namespace}
// Ignore updates of own cluster
if service.Cluster == option.Config.ClusterName {
scopedLog.Debug("Not merging external service. Own cluster")
return
}
s.mutex.Lock()
defer s.mutex.Unlock()
externalEndpoints, ok := s.externalEndpoints[id]
if ok {
scopedLog.Debug("Deleting external endpoints")
delete(externalEndpoints.endpoints, service.Cluster)
svc, ok := s.services[id]
endpoints, serviceReady := s.correlateEndpoints(id)
// Only send event notification if service is shared. External
// endpoints are still tracked but correlation will not happen
// until the service is marked as shared.
if ok && svc.Shared {
event := ServiceEvent{
Action: UpdateService,
ID: id,
Service: svc,
Endpoints: endpoints,
}
if !serviceReady {
event.Action = DeleteService
}
s.Events <- event
}
} else {
scopedLog.Debug("Received delete event for non-existing endpoints")
}
}
// DebugStatus implements debug.StatusObject to provide debug status collection
// ability
func (s *ServiceCache) DebugStatus() string {
s.mutex.RLock()
str := spew.Sdump(s)
s.mutex.RUnlock()
return str
}