cluster/router/condition/dynamic_router.go - dubbo-go - Git at Google

 /*
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.
  * The ASF licenses this file to You 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 condition

 import (
 	"fmt"
 	"strconv"
 	"strings"
 	"sync"
 )

 import (
 	"github.com/dubbogo/gost/log/logger"

 	"gopkg.in/yaml.v2"
 )

 import (
 	"dubbo.apache.org/dubbo-go/v3/cluster/utils"
 	"dubbo.apache.org/dubbo-go/v3/common"
 	conf "dubbo.apache.org/dubbo-go/v3/common/config"
 	"dubbo.apache.org/dubbo-go/v3/common/constant"
 	"dubbo.apache.org/dubbo-go/v3/config"
 	"dubbo.apache.org/dubbo-go/v3/config_center"
 	"dubbo.apache.org/dubbo-go/v3/protocol/base"
 	"dubbo.apache.org/dubbo-go/v3/remoting"
 )

 // for version 3.0-
 type stateRouters []*StateRouter

 func (p stateRouters) route(invokers []base.Invoker, url *common.URL, invocation base.Invocation) []base.Invoker {
 	if len(invokers) == 0 || len(p) == 0 {
 		return invokers
 	}
 	for _, router := range p {
 		invokers = router.Route(invokers, url, invocation)
 		if len(invokers) == 0 {
 			break
 		}
 	}
 	return invokers
 }

 type multiplyConditionRoute struct {
 	trafficDisabled []*FieldMatcher
 	routes          []*MultiDestRouter
 }

 func (m *multiplyConditionRoute) route(invokers []base.Invoker, url *common.URL, invocation base.Invocation) []base.Invoker {
 	if len(m.trafficDisabled) != 0 {
 		for _, cond := range m.trafficDisabled {
 			if cond.MatchRequest(url, invocation) {
 				logger.Warnf("Request has been disabled %s by Condition.trafficDisable.match=\"%s\"", url.String(), cond.rule)
 				invocation.SetAttachment(constant.TrafficDisableKey, struct{}{})
 				return []base.Invoker{}
 			}
 		}
 	}

 	if len(invokers) != 0 && len(m.routes) != 0 {
 		for _, router := range m.routes {
 			isMatchWhen := false
 			invokers, isMatchWhen = router.Route(invokers, url, invocation)
 			if !isMatchWhen {
 				continue
 			}
 			if len(invokers) == 0 {
 				routeChains, ok := invocation.Attributes()["condition-chain"].([]string)
 				if ok {
 					logger.Errorf("request[%s] route an empty set in condition-route:: %s", url.String(), strings.Join(routeChains, "-->"))
 				}
 				return []base.Invoker{}
 			}
 		}
 		delete(invocation.Attributes(), "condition-chain")
 	}

 	return invokers
 }

 type condRouter interface {
 	route(invokers []base.Invoker, url *common.URL, invocation base.Invocation) []base.Invoker
 }

 type DynamicRouter struct {
 	mu              sync.RWMutex
 	force           bool
 	enable          bool
 	conditionRouter condRouter
 }

 func (d *DynamicRouter) Route(invokers []base.Invoker, url *common.URL, invocation base.Invocation) []base.Invoker {
 	if len(invokers) == 0 {
 		return invokers
 	}

 	d.mu.RLock()
 	force, enable, cr := d.force, d.enable, d.conditionRouter
 	d.mu.RUnlock()

 	if !enable {
 		return invokers
 	}
 	if cr != nil {
 		res := cr.route(invokers, url, invocation)
 		if len(res) == 0 {
 			if invocation.GetAttachmentInterface(constant.TrafficDisableKey) == nil && !force {
 				return invokers
 			}
 		}
 		return res
 	} else {
 		return invokers
 	}
 }

 func (d *DynamicRouter) URL() *common.URL {
 	return nil
 }

 func (d *DynamicRouter) Process(event *config_center.ConfigChangeEvent) {
 	d.mu.Lock()
 	defer d.mu.Unlock()

 	if event.ConfigType == remoting.EventTypeDel {
 		d.conditionRouter = nil
 	} else {
 		rc, force, enable, err := generateCondition(event.Value.(string))
 		if err != nil {
 			logger.Errorf("generate condition error: %v", err)
 			d.conditionRouter = nil
 		} else {
 			d.force, d.enable, d.conditionRouter = force, enable, rc
 		}
 	}
 }

 /*
 to check configVersion, here need decode twice.
 From a performance perspective, decoding from a string and decoding from a map[string]any
 cost nearly same (a few milliseconds).

 To keep the code simpler,
 here use yaml-to-map and yaml-to-struct, not yaml-to-map-to-struct

 generateCondition @return(router,force,enable,error)
 */
 func generateCondition(rawConfig string) (condRouter, bool, bool, error) {
 	m := map[string]any{}

 	err := yaml.Unmarshal([]byte(rawConfig), m)
 	if err != nil {
 		return nil, false, false, err
 	}

 	rawVersion, ok := m["configVersion"]
 	if !ok {
 		return nil, false, false, fmt.Errorf("miss `ConfigVersion` in %s", rawConfig)
 	}

 	version, ok := rawVersion.(string)
 	if !ok {
 		return nil, false, false, fmt.Errorf("`ConfigVersion` should be of type `string`, got %T", rawVersion)
 	}

 	v, parseErr := utils.ParseVersion(version)
 	if parseErr != nil {
 		return nil, false, false, fmt.Errorf("invalid version %s: %s", version, parseErr.Error())
 	}

 	switch {
 	case v.Equal(utils.V3_1) || v.Greater(utils.V3_1):
 		return generateMultiConditionRoute(rawConfig)
 	case v.Less(utils.V3_1):
 		return generateConditionsRoute(rawConfig)
 	default:
 		panic("invalid version compare return")
 	}
 }

 func generateMultiConditionRoute(rawConfig string) (*multiplyConditionRoute, bool, bool, error) {
 	routerConfig, err := parseMultiConditionRoute(rawConfig)
 	if err != nil {
 		logger.Warnf("[condition router]Build a new condition route config error, %s and we will use the original condition rule configuration.", err.Error())
 		return nil, false, false, err
 	}

 	enable, force := routerConfig.Enabled, routerConfig.Force
 	if !enable {
 		return nil, false, false, nil
 	}

 	// remove same condition
 	removeDuplicates(routerConfig.Conditions)

 	conditionRouters := make([]*MultiDestRouter, 0, len(routerConfig.Conditions))
 	disableMultiConditions := make([]*FieldMatcher, 0)
 	for _, conditionRule := range routerConfig.Conditions {
 		// removeDuplicates will set nil
 		if conditionRule == nil {
 			continue
 		}
 		url, err1 := common.NewURL("condition://")
 		if err1 != nil {
 			return nil, false, false, err1
 		}

 		url.SetAttribute(constant.RuleKey, conditionRule)

 		conditionRoute, err2 := NewConditionMultiDestRouter(url)
 		if err2 != nil {
 			return nil, false, false, err2
 		}
 		// got invalid condition config, continue
 		if conditionRoute == nil {
 			continue
 		}
 		if len(conditionRoute.thenCondition) != 0 {
 			conditionRouters = append(conditionRouters, conditionRoute)
 		} else {
 			disableMultiConditions = append(disableMultiConditions, &conditionRoute.whenCondition)
 		}
 	}

 	return &multiplyConditionRoute{
 		trafficDisabled: disableMultiConditions,
 		routes:          conditionRouters,
 	}, force, enable, nil
 }

 func generateConditionsRoute(rawConfig string) (stateRouters, bool, bool, error) {
 	routerConfig, err := parseConditionRoute(rawConfig)
 	if err != nil {
 		logger.Warnf("[condition router]Build a new condition route config error, %s and we will use the original condition rule configuration.", err.Error())
 		return nil, false, false, err
 	}

 	force, enable := *routerConfig.Enabled, *routerConfig.Force
 	if !enable {
 		return nil, false, false, nil
 	}

 	conditionRouters := make([]*StateRouter, 0, len(routerConfig.Conditions))
 	for _, conditionRule := range routerConfig.Conditions {
 		url, err := common.NewURL("condition://")
 		if err != nil {
 			return nil, false, false, err
 		}
 		url.AddParam(constant.RuleKey, conditionRule)
 		url.AddParam(constant.ForceKey, strconv.FormatBool(*routerConfig.Force))
 		conditionRoute, err := NewConditionStateRouter(url)
 		if err != nil {
 			return nil, false, false, err
 		}
 		conditionRouters = append(conditionRouters, conditionRoute)
 	}
 	return conditionRouters, force, enable, nil
 }

 // ServiceRouter is Service level router
 type ServiceRouter struct {
 	DynamicRouter
 }

 func NewServiceRouter() *ServiceRouter {
 	return &ServiceRouter{}
 }

 func (s *ServiceRouter) Priority() int64 {
 	return 140
 }

 func (s *ServiceRouter) Notify(invokers []base.Invoker) {
 	if len(invokers) == 0 {
 		return
 	}
 	url := invokers[0].GetURL()
 	if url == nil {
 		logger.Error("Failed to notify a dynamically condition rule, because url is empty")
 		return
 	}

 	dynamicConfiguration := conf.GetEnvInstance().GetDynamicConfiguration()
 	if dynamicConfiguration == nil {
 		logger.Infof("Config center does not start, Condition router will not be enabled")
 		return
 	}
 	key := strings.Join([]string{url.ColonSeparatedKey(), constant.ConditionRouterRuleSuffix}, "")
 	dynamicConfiguration.AddListener(key, s)
 	value, err := dynamicConfiguration.GetRule(key)
 	if err != nil {
 		logger.Errorf("Failed to query condition rule, key=%s, err=%v", key, err)
 		return
 	}
 	if value == "" {
 		logger.Infof("Condition rule is empty, key=%s", key)
 		return
 	}
 	s.Process(&config_center.ConfigChangeEvent{Key: key, Value: value, ConfigType: remoting.EventTypeAdd})
 }

 // ApplicationRouter is Application level router
 type ApplicationRouter struct {
 	DynamicRouter
 	application        string
 	currentApplication string
 }

 func NewApplicationRouter() *ApplicationRouter {
 	applicationName := config.GetApplicationConfig().Name
 	a := &ApplicationRouter{
 		currentApplication: applicationName,
 	}

 	dynamicConfiguration := conf.GetEnvInstance().GetDynamicConfiguration()
 	if dynamicConfiguration != nil {
 		dynamicConfiguration.AddListener(strings.Join([]string{applicationName, constant.ConditionRouterRuleSuffix}, ""), a)
 	}
 	return a
 }

 func (a *ApplicationRouter) Priority() int64 {
 	return 145
 }

 func (a *ApplicationRouter) Notify(invokers []base.Invoker) {
 	if len(invokers) == 0 {
 		return
 	}
 	url := invokers[0].GetURL()
 	if url == nil {
 		logger.Error("Failed to notify a dynamically condition rule, because url is empty")
 		return
 	}

 	dynamicConfiguration := conf.GetEnvInstance().GetDynamicConfiguration()
 	if dynamicConfiguration == nil {
 		logger.Infof("Config center does not start, Condition router will not be enabled")
 		return
 	}

 	providerApplication := url.GetParam("application", "")
 	if providerApplication == "" || providerApplication == a.currentApplication {
 		logger.Warn("condition router get providerApplication is empty, will not subscribe to provider app rules.")
 		return
 	}

 	if providerApplication != a.application {
 		if a.application != "" {
 			dynamicConfiguration.RemoveListener(strings.Join([]string{a.application, constant.ConditionRouterRuleSuffix}, ""), a)
 		}

 		key := strings.Join([]string{providerApplication, constant.ConditionRouterRuleSuffix}, "")
 		dynamicConfiguration.AddListener(key, a)
 		a.application = providerApplication
 		value, err := dynamicConfiguration.GetRule(key)
 		if err != nil {
 			logger.Errorf("Failed to query condition rule, key=%s, err=%v", key, err)
 			return
 		}
 		if value == "" {
 			logger.Infof("Condition rule is empty, key=%s", key)
 			return
 		}
 		a.Process(&config_center.ConfigChangeEvent{Key: key, Value: value, ConfigType: remoting.EventTypeUpdate})
 	}
 }

 func removeDuplicates(rules []*config.ConditionRule) {
 	for i := 0; i < len(rules); i++ {
 		if rules[i] == nil {
 			continue
 		}
 		for j := i + 1; j < len(rules); j++ {
 			if rules[j] != nil && rules[i].Equal(rules[j]) {
 				rules[j] = nil
 			}
 		}
 	}
 }
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You 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 condition

	import (
	"fmt"
	"strconv"
	"strings"
	"sync"
	)

	import (
	"github.com/dubbogo/gost/log/logger"

	"gopkg.in/yaml.v2"
	)

	import (
	"dubbo.apache.org/dubbo-go/v3/cluster/utils"
	"dubbo.apache.org/dubbo-go/v3/common"
	conf "dubbo.apache.org/dubbo-go/v3/common/config"
	"dubbo.apache.org/dubbo-go/v3/common/constant"
	"dubbo.apache.org/dubbo-go/v3/config"
	"dubbo.apache.org/dubbo-go/v3/config_center"
	"dubbo.apache.org/dubbo-go/v3/protocol/base"
	"dubbo.apache.org/dubbo-go/v3/remoting"
	)

	// for version 3.0-
	type stateRouters []*StateRouter

	func (p stateRouters) route(invokers []base.Invoker, url *common.URL, invocation base.Invocation) []base.Invoker {
	if len(invokers) == 0 \|\| len(p) == 0 {
	return invokers
	}
	for _, router := range p {
	invokers = router.Route(invokers, url, invocation)
	if len(invokers) == 0 {
	break
	}
	}
	return invokers
	}

	type multiplyConditionRoute struct {
	trafficDisabled []*FieldMatcher
	routes []*MultiDestRouter
	}

	func (m multiplyConditionRoute) route(invokers []base.Invoker, url common.URL, invocation base.Invocation) []base.Invoker {
	if len(m.trafficDisabled) != 0 {
	for _, cond := range m.trafficDisabled {
	if cond.MatchRequest(url, invocation) {
	logger.Warnf("Request has been disabled %s by Condition.trafficDisable.match=\"%s\"", url.String(), cond.rule)
	invocation.SetAttachment(constant.TrafficDisableKey, struct{}{})
	return []base.Invoker{}
	}
	}
	}

	if len(invokers) != 0 && len(m.routes) != 0 {
	for _, router := range m.routes {
	isMatchWhen := false
	invokers, isMatchWhen = router.Route(invokers, url, invocation)
	if !isMatchWhen {
	continue
	}
	if len(invokers) == 0 {
	routeChains, ok := invocation.Attributes()["condition-chain"].([]string)
	if ok {
	logger.Errorf("request[%s] route an empty set in condition-route:: %s", url.String(), strings.Join(routeChains, "-->"))
	}
	return []base.Invoker{}
	}
	}
	delete(invocation.Attributes(), "condition-chain")
	}

	return invokers
	}

	type condRouter interface {
	route(invokers []base.Invoker, url *common.URL, invocation base.Invocation) []base.Invoker
	}

	type DynamicRouter struct {
	mu sync.RWMutex
	force bool
	enable bool
	conditionRouter condRouter
	}

	func (d DynamicRouter) Route(invokers []base.Invoker, url common.URL, invocation base.Invocation) []base.Invoker {
	if len(invokers) == 0 {
	return invokers
	}

	d.mu.RLock()
	force, enable, cr := d.force, d.enable, d.conditionRouter
	d.mu.RUnlock()

	if !enable {
	return invokers
	}
	if cr != nil {
	res := cr.route(invokers, url, invocation)
	if len(res) == 0 {
	if invocation.GetAttachmentInterface(constant.TrafficDisableKey) == nil && !force {
	return invokers
	}
	}
	return res
	} else {
	return invokers
	}
	}

	func (d DynamicRouter) URL() common.URL {
	return nil
	}

	func (d DynamicRouter) Process(event config_center.ConfigChangeEvent) {
	d.mu.Lock()
	defer d.mu.Unlock()

	if event.ConfigType == remoting.EventTypeDel {
	d.conditionRouter = nil
	} else {
	rc, force, enable, err := generateCondition(event.Value.(string))
	if err != nil {
	logger.Errorf("generate condition error: %v", err)
	d.conditionRouter = nil
	} else {
	d.force, d.enable, d.conditionRouter = force, enable, rc
	}
	}
	}

	/*
	to check configVersion, here need decode twice.
	From a performance perspective, decoding from a string and decoding from a map[string]any
	cost nearly same (a few milliseconds).

	To keep the code simpler,
	here use yaml-to-map and yaml-to-struct, not yaml-to-map-to-struct

	generateCondition @return(router,force,enable,error)
	*/
	func generateCondition(rawConfig string) (condRouter, bool, bool, error) {
	m := map[string]any{}

	err := yaml.Unmarshal([]byte(rawConfig), m)
	if err != nil {
	return nil, false, false, err
	}

	rawVersion, ok := m["configVersion"]
	if !ok {
	return nil, false, false, fmt.Errorf("miss `ConfigVersion` in %s", rawConfig)
	}

	version, ok := rawVersion.(string)
	if !ok {
	return nil, false, false, fmt.Errorf("`ConfigVersion` should be of type `string`, got %T", rawVersion)
	}

	v, parseErr := utils.ParseVersion(version)
	if parseErr != nil {
	return nil, false, false, fmt.Errorf("invalid version %s: %s", version, parseErr.Error())
	}

	switch {
	case v.Equal(utils.V3_1) \|\| v.Greater(utils.V3_1):
	return generateMultiConditionRoute(rawConfig)
	case v.Less(utils.V3_1):
	return generateConditionsRoute(rawConfig)
	default:
	panic("invalid version compare return")
	}
	}

	func generateMultiConditionRoute(rawConfig string) (*multiplyConditionRoute, bool, bool, error) {
	routerConfig, err := parseMultiConditionRoute(rawConfig)
	if err != nil {
	logger.Warnf("[condition router]Build a new condition route config error, %s and we will use the original condition rule configuration.", err.Error())
	return nil, false, false, err
	}

	enable, force := routerConfig.Enabled, routerConfig.Force
	if !enable {
	return nil, false, false, nil
	}

	// remove same condition
	removeDuplicates(routerConfig.Conditions)

	conditionRouters := make([]*MultiDestRouter, 0, len(routerConfig.Conditions))
	disableMultiConditions := make([]*FieldMatcher, 0)
	for _, conditionRule := range routerConfig.Conditions {
	// removeDuplicates will set nil
	if conditionRule == nil {
	continue
	}
	url, err1 := common.NewURL("condition://")
	if err1 != nil {
	return nil, false, false, err1
	}

	url.SetAttribute(constant.RuleKey, conditionRule)

	conditionRoute, err2 := NewConditionMultiDestRouter(url)
	if err2 != nil {
	return nil, false, false, err2
	}
	// got invalid condition config, continue
	if conditionRoute == nil {
	continue
	}
	if len(conditionRoute.thenCondition) != 0 {
	conditionRouters = append(conditionRouters, conditionRoute)
	} else {
	disableMultiConditions = append(disableMultiConditions, &conditionRoute.whenCondition)
	}
	}

	return &multiplyConditionRoute{
	trafficDisabled: disableMultiConditions,
	routes: conditionRouters,
	}, force, enable, nil
	}

	func generateConditionsRoute(rawConfig string) (stateRouters, bool, bool, error) {
	routerConfig, err := parseConditionRoute(rawConfig)
	if err != nil {
	logger.Warnf("[condition router]Build a new condition route config error, %s and we will use the original condition rule configuration.", err.Error())
	return nil, false, false, err
	}

	force, enable := routerConfig.Enabled, routerConfig.Force
	if !enable {
	return nil, false, false, nil
	}

	conditionRouters := make([]*StateRouter, 0, len(routerConfig.Conditions))
	for _, conditionRule := range routerConfig.Conditions {
	url, err := common.NewURL("condition://")
	if err != nil {
	return nil, false, false, err
	}
	url.AddParam(constant.RuleKey, conditionRule)
	url.AddParam(constant.ForceKey, strconv.FormatBool(*routerConfig.Force))
	conditionRoute, err := NewConditionStateRouter(url)
	if err != nil {
	return nil, false, false, err
	}
	conditionRouters = append(conditionRouters, conditionRoute)
	}
	return conditionRouters, force, enable, nil
	}

	// ServiceRouter is Service level router
	type ServiceRouter struct {
	DynamicRouter
	}

	func NewServiceRouter() *ServiceRouter {
	return &ServiceRouter{}
	}

	func (s *ServiceRouter) Priority() int64 {
	return 140
	}

	func (s *ServiceRouter) Notify(invokers []base.Invoker) {
	if len(invokers) == 0 {
	return
	}
	url := invokers[0].GetURL()
	if url == nil {
	logger.Error("Failed to notify a dynamically condition rule, because url is empty")
	return
	}

	dynamicConfiguration := conf.GetEnvInstance().GetDynamicConfiguration()
	if dynamicConfiguration == nil {
	logger.Infof("Config center does not start, Condition router will not be enabled")
	return
	}
	key := strings.Join([]string{url.ColonSeparatedKey(), constant.ConditionRouterRuleSuffix}, "")
	dynamicConfiguration.AddListener(key, s)
	value, err := dynamicConfiguration.GetRule(key)
	if err != nil {
	logger.Errorf("Failed to query condition rule, key=%s, err=%v", key, err)
	return
	}
	if value == "" {
	logger.Infof("Condition rule is empty, key=%s", key)
	return
	}
	s.Process(&config_center.ConfigChangeEvent{Key: key, Value: value, ConfigType: remoting.EventTypeAdd})
	}

	// ApplicationRouter is Application level router
	type ApplicationRouter struct {
	DynamicRouter
	application string
	currentApplication string
	}

	func NewApplicationRouter() *ApplicationRouter {
	applicationName := config.GetApplicationConfig().Name
	a := &ApplicationRouter{
	currentApplication: applicationName,
	}

	dynamicConfiguration := conf.GetEnvInstance().GetDynamicConfiguration()
	if dynamicConfiguration != nil {
	dynamicConfiguration.AddListener(strings.Join([]string{applicationName, constant.ConditionRouterRuleSuffix}, ""), a)
	}
	return a
	}

	func (a *ApplicationRouter) Priority() int64 {
	return 145
	}

	func (a *ApplicationRouter) Notify(invokers []base.Invoker) {
	if len(invokers) == 0 {
	return
	}
	url := invokers[0].GetURL()
	if url == nil {
	logger.Error("Failed to notify a dynamically condition rule, because url is empty")
	return
	}

	dynamicConfiguration := conf.GetEnvInstance().GetDynamicConfiguration()
	if dynamicConfiguration == nil {
	logger.Infof("Config center does not start, Condition router will not be enabled")
	return
	}

	providerApplication := url.GetParam("application", "")
	if providerApplication == "" \|\| providerApplication == a.currentApplication {
	logger.Warn("condition router get providerApplication is empty, will not subscribe to provider app rules.")
	return
	}

	if providerApplication != a.application {
	if a.application != "" {
	dynamicConfiguration.RemoveListener(strings.Join([]string{a.application, constant.ConditionRouterRuleSuffix}, ""), a)
	}

	key := strings.Join([]string{providerApplication, constant.ConditionRouterRuleSuffix}, "")
	dynamicConfiguration.AddListener(key, a)
	a.application = providerApplication
	value, err := dynamicConfiguration.GetRule(key)
	if err != nil {
	logger.Errorf("Failed to query condition rule, key=%s, err=%v", key, err)
	return
	}
	if value == "" {
	logger.Infof("Condition rule is empty, key=%s", key)
	return
	}
	a.Process(&config_center.ConfigChangeEvent{Key: key, Value: value, ConfigType: remoting.EventTypeUpdate})
	}
	}

	func removeDuplicates(rules []*config.ConditionRule) {
	for i := 0; i < len(rules); i++ {
	if rules[i] == nil {
	continue
	}
	for j := i + 1; j < len(rules); j++ {
	if rules[j] != nil && rules[i].Equal(rules[j]) {
	rules[j] = nil
	}
	}
	}
	}