| /* |
| * 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 tag |
| |
| import ( |
| "strings" |
| "sync" |
| ) |
| |
| import ( |
| "github.com/dubbogo/gost/log/logger" |
| |
| "gopkg.in/yaml.v2" |
| ) |
| |
| import ( |
| "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" |
| "dubbo.apache.org/dubbo-go/v3/remoting" |
| ) |
| |
| type PriorityRouter struct { |
| routerConfigs sync.Map |
| } |
| |
| func NewTagPriorityRouter() (*PriorityRouter, error) { |
| return &PriorityRouter{}, nil |
| } |
| |
| // Route Determine the target invokers list. |
| func (p *PriorityRouter) Route(invokers []protocol.Invoker, url *common.URL, invocation protocol.Invocation) []protocol.Invoker { |
| if len(invokers) == 0 { |
| logger.Warnf("[tag router] invokers from previous router is empty") |
| return invokers |
| } |
| key := url.Service() + constant.TagRouterRuleSuffix |
| value, ok := p.routerConfigs.Load(key) |
| if !ok { |
| return staticTag(invokers, url, invocation) |
| } |
| routerCfg := value.(config.RouterConfig) |
| if !routerCfg.Enabled || !routerCfg.Valid { |
| return staticTag(invokers, url, invocation) |
| } |
| return dynamicTag(invokers, url, invocation, routerCfg) |
| } |
| |
| func (p *PriorityRouter) URL() *common.URL { |
| return nil |
| } |
| |
| func (p *PriorityRouter) Priority() int64 { |
| return 0 |
| } |
| |
| func (p *PriorityRouter) Notify(invokers []protocol.Invoker) { |
| if len(invokers) == 0 { |
| return |
| } |
| service := invokers[0].GetURL().Service() |
| if service == "" { |
| logger.Error("url service is empty") |
| return |
| } |
| dynamicConfiguration := conf.GetEnvInstance().GetDynamicConfiguration() |
| if dynamicConfiguration == nil { |
| logger.Warnf("config center does not start, please check if the configuration center has been properly configured in dubbogo.yml") |
| return |
| } |
| key := service + constant.TagRouterRuleSuffix |
| dynamicConfiguration.AddListener(key, p) |
| value, err := dynamicConfiguration.GetRule(key) |
| if err != nil { |
| logger.Errorf("query router rule fail,key=%s,err=%v", key, err) |
| return |
| } |
| p.Process(&config_center.ConfigChangeEvent{Key: key, Value: value, ConfigType: remoting.EventTypeAdd}) |
| } |
| |
| func (p *PriorityRouter) Process(event *config_center.ConfigChangeEvent) { |
| if event.ConfigType == remoting.EventTypeDel { |
| p.routerConfigs.Delete(event.Key) |
| return |
| } |
| routerConfig, err := parseRoute(event.Value.(string)) |
| if err != nil { |
| logger.Warnf("[tag router]Parse new tag route config error, %+v "+ |
| "and we will use the original tag rule configuration.", err) |
| return |
| } |
| p.routerConfigs.Store(event.Key, *routerConfig) |
| logger.Infof("[tag router]Parse tag router config success,routerConfig=%+v", routerConfig) |
| } |
| |
| func parseRoute(routeContent string) (*config.RouterConfig, error) { |
| routeDecoder := yaml.NewDecoder(strings.NewReader(routeContent)) |
| routerConfig := &config.RouterConfig{} |
| err := routeDecoder.Decode(routerConfig) |
| if err != nil { |
| return nil, err |
| } |
| routerConfig.Valid = true |
| if len(routerConfig.Tags) == 0 { |
| routerConfig.Valid = false |
| } |
| return routerConfig, nil |
| } |