forked from go-chassis/go-chassis
/
cache.go
executable file
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/
cache.go
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package servicecenter
import (
"net/url"
"strings"
"time"
"github.com/go-chassis/go-chassis/core/archaius"
"github.com/go-chassis/go-chassis/core/common"
"github.com/go-chassis/go-chassis/core/config"
"github.com/go-chassis/go-chassis/core/lager"
"github.com/go-chassis/go-chassis/core/registry"
"github.com/go-chassis/go-chassis/pkg/runtime"
"github.com/go-chassis/go-sc-client"
"github.com/go-chassis/go-sc-client/model"
"k8s.io/apimachinery/pkg/util/sets"
)
// constant values for default expiration time, and refresh interval
const (
DefaultExpireTime = 0
DefaultRefreshInterval = time.Second * 30
)
// constant values for checking instance ID status
const (
InstanceIDIsExist = "instanceIdIsExist"
InstanceIDIsNotExist = "instanceIdIsNotExist"
)
// CacheManager cache manager
type CacheManager struct {
registryClient *client.RegistryClient
}
// AutoSync automatically sync the running instances
func (c *CacheManager) AutoSync() {
c.refreshCache()
if config.GetServiceDiscoveryWatch() {
err := c.registryClient.WatchMicroService(runtime.ServiceID, watch)
if err != nil {
lager.Logger.Errorf(err, "Watch failed. Self Micro service Id:%s.", runtime.ServiceID)
}
lager.Logger.Debugf("Watching Intances change events.")
}
var ticker *time.Ticker
refreshInterval := config.GetServiceDiscoveryRefreshInterval()
if refreshInterval == "" {
ticker = time.NewTicker(DefaultRefreshInterval)
} else {
timeValue, err := time.ParseDuration(refreshInterval)
if err != nil {
lager.Logger.Errorf(err, "refeshInterval is invalid. So use Default value")
timeValue = DefaultRefreshInterval
}
ticker = time.NewTicker(timeValue)
}
go func() {
for range ticker.C {
c.refreshCache()
}
}()
}
// refreshCache refresh cache
func (c *CacheManager) refreshCache() {
if archaius.GetBool("cse.service.registry.autodiscovery", false) {
err := c.registryClient.SyncEndpoints()
if err != nil {
lager.Logger.Errorf(err, "SyncSCEndpoints failed.")
}
}
err := c.pullMicroserviceInstance()
if err != nil {
lager.Logger.Errorf(err, "AutoUpdateMicroserviceInstance failed.")
}
if archaius.GetBool("cse.service.registry.autoSchemaIndex", false) {
err = c.MakeSchemaIndex()
if err != nil {
lager.Logger.Errorf(err, "MakeSchemaIndex failed.")
}
}
if archaius.GetBool("cse.service.registry.autoIPIndex", false) {
err = c.MakeIPIndex()
if err != nil {
lager.Logger.Errorf(err, "Auto Update IP index failed.")
}
}
}
// MakeIPIndex make ip index
// if store instance metadata into tags
// it will be used in route management
func (c *CacheManager) MakeIPIndex() error {
lager.Logger.Debug("Make IP index")
services, err := c.registryClient.GetAllResources("instances")
if err != nil {
lager.Logger.Errorf(err, "Get instances failed")
return err
}
for _, service := range services {
for _, inst := range service.Instances {
for _, uri := range inst.Endpoints {
u, err := url.Parse(uri)
if err != nil {
lager.Logger.Error("Wrong URI:"+uri, err)
continue
}
si := ®istry.SourceInfo{}
si.Tags = inst.Properties
if si.Tags == nil {
si.Tags = make(map[string]string)
}
si.Name = service.MicroService.ServiceName
si.Tags[common.BuildinTagApp] = service.MicroService.AppID
si.Tags[common.BuildinTagVersion] = service.MicroService.Version
registry.SetIPIndex(u.Hostname(), si)
//no need to analyze each endpoint, so break
break
}
}
}
return nil
}
// MakeSchemaIndex make schema index
func (c *CacheManager) MakeSchemaIndex() error {
lager.Logger.Debug("Make Schema index")
microServiceList, err := c.registryClient.GetAllMicroServices()
if err != nil {
lager.Logger.Errorf(err, "Get instances failed")
return err
}
for _, ms := range microServiceList {
serviceID, err := c.registryClient.GetMicroServiceID(ms.AppID, ms.ServiceName, ms.Version, ms.Environment)
if err != nil {
continue
}
for _, schemaName := range ms.Schemas {
content, err := c.registryClient.GetSchema(serviceID, schemaName)
if err != nil {
continue
}
schemaContent, err := parseSchemaContent(content)
if err != nil {
continue
}
interfaceName := schemaContent.Info["x-java-interface"]
if interfaceName != "" {
value, ok := registry.SchemaInterfaceIndexedCache.Get(interfaceName)
if !ok {
var allMicroServices []*model.MicroService
allMicroServices = append(allMicroServices, ms)
registry.SchemaInterfaceIndexedCache.Set(interfaceName, allMicroServices, 0)
lager.Logger.Debugf("New Interface added in the Index Cache : %s", interfaceName)
} else {
val, _ := value.([]*model.MicroService)
if !checkIfMicroServiceExistInList(val, ms.ServiceID) {
val = append(val, ms)
registry.SchemaInterfaceIndexedCache.Set(interfaceName, val, 0)
lager.Logger.Debugf("New Interface added in the Index Cache : %s", interfaceName)
}
}
svcValue, ok := registry.SchemaServiceIndexedCache.Get(serviceID)
if !ok {
var allMicroServices []*model.MicroService
allMicroServices = append(allMicroServices, ms)
registry.SchemaServiceIndexedCache.Set(serviceID, allMicroServices, 0)
lager.Logger.Debugf("New Service added in the Index Cache : %s", serviceID)
} else {
val, _ := svcValue.([]*model.MicroService)
if !checkIfMicroServiceExistInList(val, ms.ServiceID) {
val = append(val, ms)
registry.SchemaServiceIndexedCache.Set(serviceID, val, 0)
lager.Logger.Debugf("New Service added in the Index Cache : %s", serviceID)
}
}
}
}
}
return nil
}
// This functions checks if the microservices exist in the list passed in argument
func checkIfMicroServiceExistInList(microserviceList []*model.MicroService, serviceID string) bool {
msIsPresentInList := false
for _, interfaceMicroserviceList := range microserviceList {
if interfaceMicroserviceList.ServiceID == serviceID {
msIsPresentInList = true
break
}
}
return msIsPresentInList
}
// pullMicroserviceInstance pull micro-service instance
func (c *CacheManager) pullMicroserviceInstance() error {
//Get Providers
rsp, err := c.registryClient.GetProviders(runtime.ServiceID)
if err != nil {
lager.Logger.Errorf(err, "get Providers failed, sid = %s", runtime.ServiceID)
return err
}
serviceNameSet, serviceNameAppIDKeySet := c.getServiceSet(rsp.Services)
c.compareAndDeleteOutdatedProviders(serviceNameSet)
for key := range serviceNameAppIDKeySet {
service := strings.Split(key, ":")
if len(service) != 2 {
lager.Logger.Errorf(err, "Invalid serviceStore %s for providers %s", key, runtime.ServiceID)
continue
}
providerInstances, err := c.registryClient.FindMicroServiceInstances(runtime.ServiceID, service[1],
service[0], findVersionRule(service[0]))
if err != nil {
if err == client.ErrNotModified {
lager.Logger.Debug(err.Error())
continue
}
lager.Logger.Error("Refresh local instance cache failed", err)
continue
}
filterReIndex(providerInstances, service[0], service[1])
}
return nil
}
func (c *CacheManager) compareAndDeleteOutdatedProviders(newProviders sets.String) {
oldProviders := registry.MicroserviceInstanceIndex.Items()
for old := range oldProviders {
if !newProviders.Has(old) { //provider is outdated, delete it
registry.MicroserviceInstanceIndex.Delete(old)
}
}
}
// getServiceSet returns service sets
func (c *CacheManager) getServiceSet(exist []*model.MicroService) (sets.String, sets.String) {
//get Provider's instances
serviceNameSet := sets.NewString() // key is serviceName
serviceNameAppIDKeySet := sets.NewString() // key is "serviceName:appId"
if exist == nil || len(exist) == 0 {
return serviceNameSet, serviceNameAppIDKeySet
}
for _, microservice := range exist {
if microservice == nil {
continue
}
serviceNameSet.Insert(microservice.ServiceName)
key := strings.Join([]string{microservice.ServiceName, microservice.AppID}, ":")
serviceNameAppIDKeySet.Insert(key)
}
return serviceNameSet, serviceNameAppIDKeySet
}
func filterReIndex(providerInstances []*model.MicroServiceInstance, serviceName string, appID string) {
ups := make([]*registry.MicroServiceInstance, 0, len(providerInstances))
downs := make(map[string]struct{})
for _, ins := range providerInstances {
switch {
case ins.Version == "":
lager.Logger.Warn("do not support old service center, plz upgrade")
continue
case ins.Status != common.DefaultStatus:
downs[ins.InstanceID] = struct{}{}
lager.Logger.Debugf("do not cache the instance in '%s' status, instanceId = %s/%s",
ins.Status, ins.ServiceID, ins.InstanceID)
continue
default:
ups = append(ups, ToMicroServiceInstance(ins).WithAppID(appID))
}
}
registry.RefreshCache(serviceName, ups, downs)
}
// findVersionRule returns version rules for microservice
func findVersionRule(microservice string) string {
if ref, ok := config.GlobalDefinition.Cse.References[microservice]; ok {
return ref.Version
}
return common.AllVersion
}
// watch watching micro-service instance status
func watch(response *model.MicroServiceInstanceChangedEvent) {
if response.Instance.Status != model.MSInstanceUP {
response.Action = common.Delete
}
switch response.Action {
case model.EventCreate:
createAction(response)
break
case model.EventDelete:
deleteAction(response)
break
case model.EventUpdate:
updateAction(response)
break
case model.EventError:
lager.Logger.Warnf("MicroServiceInstanceChangedEvent action is error, MicroServiceInstanceChangedEvent = %s", response)
break
default:
lager.Logger.Warnf("Do not support this Action = %s", response.Action)
return
}
}
// createAction added micro-service instance to the cache
func createAction(response *model.MicroServiceInstanceChangedEvent) {
key := response.Key.ServiceName
value, ok := registry.MicroserviceInstanceIndex.Get(key, nil)
if !ok {
lager.Logger.Errorf(nil, "ServiceID does not exist in MicroserviceInstanceCache,action is EVT_CREATE.key = %s", key)
return
}
microServiceInstances, ok := value.([]*registry.MicroServiceInstance)
if !ok {
lager.Logger.Errorf(nil, "Type asserts failed.action is EVT_CREATE,sid = %s", response.Instance.ServiceID)
return
}
if response.Instance.Status != model.MSInstanceUP {
lager.Logger.Warnf("createAction failed,MicroServiceInstance status is not MSI_UP,MicroServiceInstanceChangedEvent = %s", response)
return
}
msi := ToMicroServiceInstance(response.Instance).WithAppID(response.Key.AppID)
microServiceInstances = append(microServiceInstances, msi)
registry.MicroserviceInstanceIndex.Set(key, microServiceInstances)
lager.Logger.Debugf("Cached Instances,action is EVT_CREATE, sid = %s, instances length = %d", response.Instance.ServiceID, len(microServiceInstances))
}
// deleteAction delete micro-service instance
func deleteAction(response *model.MicroServiceInstanceChangedEvent) {
key := response.Key.ServiceName
lager.Logger.Debugf("Received event EVT_DELETE, sid = %s, endpoints = %s", response.Instance.ServiceID, response.Instance.Endpoints)
if err := registry.HealthCheck(key, response.Key.Version, response.Key.AppID, ToMicroServiceInstance(response.Instance)); err == nil {
return
}
value, ok := registry.MicroserviceInstanceIndex.Get(key, nil)
if !ok {
lager.Logger.Errorf(nil, "ServiceID does not exist in MicroserviceInstanceCache, action is EVT_DELETE, key = %s", key)
return
}
microServiceInstances, ok := value.([]*registry.MicroServiceInstance)
if !ok {
lager.Logger.Errorf(nil, "Type asserts failed.action is EVT_DELETE, sid = %s", response.Instance.ServiceID)
return
}
var newInstances = make([]*registry.MicroServiceInstance, 0)
for _, v := range microServiceInstances {
if v.InstanceID != response.Instance.InstanceID {
newInstances = append(newInstances, v)
}
}
registry.MicroserviceInstanceIndex.Set(key, newInstances)
lager.Logger.Debugf("Cached [%d] Instances of service [%s]", len(newInstances), key)
}
// updateAction update micro-service instance event
func updateAction(response *model.MicroServiceInstanceChangedEvent) {
key := response.Key.ServiceName
value, ok := registry.MicroserviceInstanceIndex.Get(key, nil)
if !ok {
lager.Logger.Errorf(nil, "ServiceID does not exist in MicroserviceInstanceCache, action is EVT_UPDATE, sid = %s", key)
return
}
microServiceInstances, ok := value.([]*registry.MicroServiceInstance)
if !ok {
lager.Logger.Errorf(nil, "Type asserts failed.action is EVT_UPDATE, sid = %s", response.Instance.ServiceID)
return
}
if response.Instance.Status != model.MSInstanceUP {
lager.Logger.Warnf("updateAction failed, MicroServiceInstance status is not MSI_UP, MicroServiceInstanceChangedEvent = %s", response)
return
}
msi := ToMicroServiceInstance(response.Instance).WithAppID(response.Key.AppID)
var iidExist = InstanceIDIsNotExist
var arrayNum int
for k, v := range microServiceInstances {
if v.InstanceID == response.Instance.InstanceID {
iidExist = InstanceIDIsExist
arrayNum = k
}
}
switch iidExist {
case InstanceIDIsExist:
microServiceInstances[arrayNum] = msi
break
case InstanceIDIsNotExist:
microServiceInstances = append(microServiceInstances, msi)
break
default:
lager.Logger.Warnf("updateAction error, iid:%s", response.Instance.InstanceID)
}
registry.MicroserviceInstanceIndex.Set(key, microServiceInstances)
lager.Logger.Debugf("Cached Instances,action is EVT_UPDATE, sid = %s, instances length = %d", response.Instance.ServiceID, len(microServiceInstances))
}