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serviceentry.go
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serviceentry.go
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package clusters
import (
"errors"
"fmt"
"github.com/istio-ecosystem/admiral/admiral/pkg/controller/admiral"
"github.com/istio-ecosystem/admiral/admiral/pkg/controller/common"
"github.com/istio-ecosystem/admiral/admiral/pkg/controller/istio"
"github.com/istio-ecosystem/admiral/admiral/pkg/controller/util"
"github.com/sirupsen/logrus"
"gopkg.in/yaml.v2"
networking "istio.io/api/networking/v1alpha3"
istioModel "istio.io/istio/pilot/pkg/model"
"istio.io/istio/pkg/log"
k8sAppsV1 "k8s.io/api/apps/v1"
k8sV1 "k8s.io/api/core/v1"
"math"
"math/rand"
"strconv"
"time"
)
func createServiceEntry(rc *RemoteController, config AdmiralParams, admiralCache *AdmiralCache,
destDeployment *k8sAppsV1.Deployment, serviceEntries map[string]*networking.ServiceEntry) *networking.ServiceEntry {
globalFqdn := common.GetCname(destDeployment, config.LabelSet.WorkloadIdentityLabel, config.HostnameSuffix)
//Handling retries for getting/putting service entries from/in cache
//initializations
var err error = nil
maxRetries := 3
counter := 0
address := ""
needsCacheUpdate := false
for err==nil && counter<maxRetries {
address, needsCacheUpdate, err = GetLocalAddressForSe(getIstioResourceName(globalFqdn, "-se"), admiralCache.ServiceEntryAddressStore, admiralCache.ConfigMapController)
//random expo backoff
timeToBackoff := rand.Intn(int(math.Pow(100.0, float64(counter)))) //get a random number between 0 and 100^counter. Will always be 0 the first time, will be 0-100 the second, and 0-1000 the third
time.Sleep(time.Duration(timeToBackoff)*time.Millisecond)
counter++
}
if err != nil {
log.Errorf("Could not get unique address after %v retries. Failing to create serviceentry name=%v", maxRetries, globalFqdn)
return nil
}
if needsCacheUpdate {
loadServiceEntryCacheData(admiralCache.ConfigMapController, admiralCache)
}
if len(globalFqdn) == 0 {
return nil
}
var san []string
if config.EnableSAN {
tmpSan := common.GetSAN(config.SANPrefix, destDeployment, config.LabelSet.WorkloadIdentityLabel)
if len(tmpSan) > 0 {
san = []string{common.GetSAN(config.SANPrefix, destDeployment, config.LabelSet.WorkloadIdentityLabel)}
}
} else {
san = nil
}
admiralCache.CnameClusterCache.Put(globalFqdn, rc.ClusterID, rc.ClusterID)
tmpSe := serviceEntries[globalFqdn]
if tmpSe == nil {
tmpSe = &networking.ServiceEntry{
Hosts: []string{globalFqdn},
//ExportTo: []string{"*"}, --> //TODO this is causing a coredns plugin to fail serving the DNS entry
Ports: []*networking.Port{{Number: uint32(common.DefaultHttpPort),
Name: common.Http, Protocol: common.Http}},
Location: networking.ServiceEntry_MESH_INTERNAL,
Resolution: networking.ServiceEntry_DNS,
Addresses: []string{address}, //It is possible that the address is an empty string. That is fine as the se creation will fail and log an error
SubjectAltNames: san,
}
tmpSe.Endpoints = []*networking.ServiceEntry_Endpoint{}
}
endpointAddress := rc.ServiceController.Cache.GetLoadBalancer(admiral.IstioIngressServiceName, common.NamespaceIstioSystem)
var locality string
if rc.NodeController.Locality != nil {
locality = rc.NodeController.Locality.Region
}
seEndpoint := makeRemoteEndpointForServiceEntry(endpointAddress,
locality, common.Http)
tmpSe.Endpoints = append(tmpSe.Endpoints, seEndpoint)
serviceEntries[globalFqdn] = tmpSe
return tmpSe
}
func createServiceEntryForNewServiceOrPod(env string, sourceIdentity string, remoteRegistry *RemoteRegistry) map[string]*networking.ServiceEntry {
//create a service entry, destination rule and virtual service in the local cluster
sourceServices := make(map[string]*k8sV1.Service)
sourceDeployments := make(map[string]*k8sAppsV1.Deployment)
var serviceEntries = make(map[string]*networking.ServiceEntry)
var cname string
for _, rc := range remoteRegistry.remoteControllers {
deployment := rc.DeploymentController.Cache.Get(sourceIdentity)
if deployment == nil || deployment.Deployments[env] == nil {
continue
}
deploymentInstance := deployment.Deployments[env]
serviceInstance := getServiceForDeployment(rc, deploymentInstance[0])
cname = common.GetCname(deploymentInstance[0], remoteRegistry.config.LabelSet.WorkloadIdentityLabel, cname)
remoteRegistry.AdmiralCache.IdentityClusterCache.Put(sourceIdentity, rc.ClusterID, rc.ClusterID)
remoteRegistry.AdmiralCache.CnameClusterCache.Put(cname, rc.ClusterID, rc.ClusterID)
remoteRegistry.AdmiralCache.CnameIdentityCache.Store(cname, sourceIdentity)
sourceServices[rc.ClusterID] = serviceInstance
sourceDeployments[rc.ClusterID] = deploymentInstance[0]
createServiceEntry(rc, remoteRegistry.config, remoteRegistry.AdmiralCache, deploymentInstance[0], serviceEntries)
}
dependents := remoteRegistry.AdmiralCache.IdentityDependencyCache.Get(sourceIdentity)
dependentClusters := getDependentClusters(dependents, remoteRegistry.AdmiralCache.IdentityClusterCache, sourceServices)
//update cname dependent cluster cache
for clusterId, _ := range dependentClusters {
remoteRegistry.AdmiralCache.CnameDependentClusterCache.Put(cname, clusterId, clusterId)
}
AddServiceEntriesWithDr(remoteRegistry.AdmiralCache, dependentClusters, remoteRegistry.remoteControllers, serviceEntries,
remoteRegistry.config.SyncNamespace)
//update the address to local fqdn for service entry in a cluster local to the service instance
for sourceCluster, serviceInstance := range sourceServices {
localFqdn := serviceInstance.Name + common.Sep + serviceInstance.Namespace + common.DotLocalDomainSuffix
rc := remoteRegistry.remoteControllers[sourceCluster]
var meshPorts = GetMeshPorts(sourceCluster, serviceInstance, sourceDeployments[sourceCluster])
for key, serviceEntry := range serviceEntries {
for _, ep := range serviceEntry.Endpoints {
clusterIngress := rc.ServiceController.Cache.GetLoadBalancer(admiral.IstioIngressServiceName, common.NamespaceIstioSystem)
//replace istio ingress-gateway address with local fqdn, note that ingress-gateway can be empty (not provisoned, or is not up)
if ep.Address == clusterIngress || ep.Address == "" {
ep.Address = localFqdn
oldPorts := ep.Ports
ep.Ports = meshPorts
AddServiceEntriesWithDr(remoteRegistry.AdmiralCache, map[string]string{sourceCluster: sourceCluster}, remoteRegistry.remoteControllers,
map[string]*networking.ServiceEntry{key: serviceEntry}, remoteRegistry.config.SyncNamespace)
//swap it back to use for next iteration
ep.Address = clusterIngress
ep.Ports = oldPorts
}
}
//add virtual service for routing locally in within the cluster
//virtualServiceName := getIstioResourceName(cname, "-default-vs")
//
//oldVirtualService := rc.IstioConfigStore.Get(istioModel.VirtualService.Type, virtualServiceName, remoteRegistry.config.SyncNamespace)
//
//virtualService := makeVirtualService(serviceEntry.Hosts[0], localFqdn, meshPorts[common.Http])
//
//newVirtualService, err := createIstioConfig(istio.VirtualServiceProto, virtualService, virtualServiceName, remoteRegistry.config.SyncNamespace)
//
//if err == nil {
// addUpdateIstioResource(rc, *newVirtualService, oldVirtualService, virtualServiceName, syncNamespace)
//} else {
// log.Errorf(LogErrFormat, "Create", istioModel.VirtualService.Type, virtualServiceName, rc.ClusterID, err)
//}
}
}
return serviceEntries
}
func createSeWithDrLabels(remoteController *RemoteController, localCluster bool, identityId string, seName string, se *networking.ServiceEntry,
dr *networking.DestinationRule, seAddressCache *ServiceEntryAddressStore, configmapController admiral.ConfigMapControllerInterface) map[string]*networking.ServiceEntry {
var allSes = make(map[string]*networking.ServiceEntry)
var newSe = copyServiceEntry(se)
address, _, err := GetLocalAddressForSe(seName, seAddressCache, configmapController)
if err != nil {
log.Warnf("Failed to get address for dr service entry. Not creating it. err:%v",err)
return nil
}
newSe.Addresses = []string{address}
var endpoints = make([]*networking.ServiceEntry_Endpoint, 0)
for _, endpoint := range se.Endpoints {
for _, subset := range dr.Subsets {
newEndpoint := copyEndpoint(endpoint)
newEndpoint.Labels = subset.Labels
////create a service entry with name subsetSeName
//if localCluster {
// subsetSeName := seName + common.Dash + subset.Name
// subsetSeAddress := strings.Split(se.Hosts[0], common.DotMesh)[0] + common.Sep + subset.Name + common.DotMesh BROKEN MUST FIX //todo fix the cname format here
//
// //TODO uncomment the line below when subset routing across clusters is fixed
// //newEndpoint.Address = subsetSeAddress
//
// subSetSe := createSeWithPodIps(remoteController, identityId, subsetSeName, subsetSeAddress, newSe, newEndpoint, subset, seAddressMap)
// if subSetSe != nil {
// allSes[subsetSeName] = subSetSe
// //TODO create default DestinationRules for these subset SEs
// }
//}
endpoints = append(endpoints, newEndpoint)
}
}
newSe.Endpoints = endpoints
allSes[seName] = newSe
return allSes
}
func AddServiceEntriesWithDr(cache *AdmiralCache, sourceClusters map[string]string, rcs map[string]*RemoteController, serviceEntries map[string]*networking.ServiceEntry,
syncNamespace string) {
for _, se := range serviceEntries {
//add service entry
serviceEntryName := getIstioResourceName(se.Hosts[0], "-se")
destinationRuleName := getIstioResourceName(se.Hosts[0], "-default-dr")
for _, sourceCluster := range sourceClusters {
rc := rcs[sourceCluster]
if rc == nil {
log.Warnf(LogFormat, "Find", "remote-controller", sourceCluster, sourceCluster, "doesn't exist")
continue
}
oldServiceEntry := rc.IstioConfigStore.Get(istioModel.ServiceEntry.Type, serviceEntryName, syncNamespace)
newServiceEntry, err := createIstioConfig(istio.ServiceEntryProto, se, serviceEntryName, syncNamespace)
//Add a label
if identityId, ok := cache.CnameIdentityCache.Load(se.Hosts[0]); ok {
newServiceEntry.Labels = map[string]string{common.DefaultGlobalIdentifier(): fmt.Sprintf("%v", identityId)}
}
if err == nil {
addUpdateIstioResource(rc, *newServiceEntry, oldServiceEntry, istioModel.ServiceEntry.Type, syncNamespace)
} else {
log.Infof(LogFormat, "CreateConfig", istioModel.ServiceEntry.Type, serviceEntryName, sourceCluster, err)
}
//add destination rule
oldDestinationRule := rc.IstioConfigStore.Get(istioModel.DestinationRule.Type, destinationRuleName, syncNamespace)
destinationRule := getDestinationRule(se.Hosts[0])
newDestinationRule, err := createIstioConfig(istio.DestinationRuleProto, destinationRule, destinationRuleName, syncNamespace)
if err == nil {
addUpdateIstioResource(rc, *newDestinationRule, oldDestinationRule, istioModel.DestinationRule.Type, syncNamespace)
} else {
log.Infof(LogFormat, "CreateConfig", istioModel.DestinationRule.Type, destinationRuleName, sourceCluster, err)
}
}
}
}
func makeRemoteEndpointForServiceEntry(address string, locality string, portName string) *networking.ServiceEntry_Endpoint {
return &networking.ServiceEntry_Endpoint{Address: address,
Locality: locality,
Ports: map[string]uint32{portName: common.DefaultMtlsPort}} //
}
func copyServiceEntry(se *networking.ServiceEntry) *networking.ServiceEntry {
return &networking.ServiceEntry{Ports: se.Ports, Resolution: se.Resolution, Hosts: se.Hosts, Location: se.Location,
SubjectAltNames: se.SubjectAltNames, ExportTo: se.ExportTo, Endpoints: se.Endpoints, Addresses: se.Addresses}
}
func loadServiceEntryCacheData(c admiral.ConfigMapControllerInterface, admiralCache *AdmiralCache) {
configmap, err := c.GetConfigMap()
if err != nil {
log.Warnf("Failed to refresh configmap state Error: %v", err)
return //No need to invalidate the cache
}
entryCache := GetServiceEntryStateFromConfigmap(configmap)
if entryCache != nil {
*admiralCache.ServiceEntryAddressStore = *entryCache
log.Infof("Successfully updated service entry cache state")
}
}
//Gets a guarenteed unique local address for a serviceentry. Returns the address, True iff the configmap was updated false otherwise, and an error if any
//Any error coupled with an empty string address means the method should be retried
func GetLocalAddressForSe(seName string, seAddressCache *ServiceEntryAddressStore, configMapController admiral.ConfigMapControllerInterface) (string, bool, error) {
var address = seAddressCache.EntryAddresses[seName]
if len(address) == 0 {
address, err := GenerateNewAddressAndAddToConfigMap(seName, configMapController)
return address, true, err
}
return address, false, nil
}
//an atomic fetch and update operation against the configmap (using K8s built in optimistic consistency mechanism via resource version)
func GenerateNewAddressAndAddToConfigMap(seName string, configMapController admiral.ConfigMapControllerInterface) (string, error){
//1. get cm, see if there. 2. gen new uq address. 3. put configmap. RETURN SUCCESSFULLY IFF CONFIGMAP PUT SUCCEEDS
cm, err := configMapController.GetConfigMap()
if err != nil {
return "", err
}
newAddressState := GetServiceEntryStateFromConfigmap(cm)
if newAddressState == nil {
return "", errors.New("could not unmarshall configmap yaml")
}
if val, ok := newAddressState.EntryAddresses[seName]; ok { //Someone else updated the address state, so we'll use that
return val, nil
}
secondIndex := (len(newAddressState.Addresses) / 255) + 10
firstIndex := (len(newAddressState.Addresses) % 255) + 1
address := common.LocalAddressPrefix + common.Sep + strconv.Itoa(secondIndex) + common.Sep + strconv.Itoa(firstIndex)
for util.Contains(newAddressState.Addresses, address) {
if firstIndex<255 {
firstIndex++
} else {
secondIndex++
firstIndex=0
}
address = common.LocalAddressPrefix + common.Sep + strconv.Itoa(secondIndex) + common.Sep + strconv.Itoa(firstIndex)
}
newAddressState.Addresses = append(newAddressState.Addresses, address)
newAddressState.EntryAddresses[seName] = address
err = putServiceEntryStateFromConfigmap(configMapController, cm, newAddressState)
if err != nil {
return "", err
}
return address, nil
}
//puts new data into an existing configmap. Providing the original is necessary to prevent fetch and update race conditions
func putServiceEntryStateFromConfigmap(c admiral.ConfigMapControllerInterface, originalConfigmap *k8sV1.ConfigMap, data *ServiceEntryAddressStore) error {
if originalConfigmap == nil {
return errors.New("configmap must not be nil")
}
bytes, err := yaml.Marshal(data)
if err != nil {
logrus.Errorf("Failed to put service entry state into the configmap. %v", err)
return err
}
if originalConfigmap.Data == nil {
originalConfigmap.Data = map[string]string{}
}
originalConfigmap.Data["serviceEntryAddressStore"] = string(bytes)
err = ValidateConfigmapBeforePutting(originalConfigmap)
if err != nil {
logrus.Errorf("Configmap failed validation. Something is wrong. Error: %v", err)
return err
}
return c.PutConfigMap(originalConfigmap)
}