| // Copyright Istio Authors |
| // |
| // 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 xds |
| |
| import ( |
| discovery "github.com/envoyproxy/go-control-plane/envoy/service/discovery/v3" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-go-pixiu/pilot/pkg/model" |
| "github.com/apache/dubbo-go-pixiu/pilot/pkg/networking/util" |
| "github.com/apache/dubbo-go-pixiu/pkg/config" |
| "github.com/apache/dubbo-go-pixiu/pkg/config/schema/gvk" |
| ) |
| |
| // NdsGenerator Nds stands for Name Discovery Service. Istio agents send NDS requests to istiod |
| // istiod responds with a list of service entries and their associated IPs (including k8s services) |
| // The agent then updates its internal DNS based on this data. If DNS capture is enabled in the pod |
| // the agent will capture all DNS requests and attempt to resolve locally before forwarding to upstream |
| // dns servers/ |
| type NdsGenerator struct { |
| Server *DiscoveryServer |
| } |
| |
| var _ model.XdsResourceGenerator = &NdsGenerator{} |
| |
| // Map of all configs that do not impact NDS |
| var skippedNdsConfigs = map[config.GroupVersionKind]struct{}{ |
| gvk.Gateway: {}, |
| gvk.VirtualService: {}, |
| gvk.DestinationRule: {}, |
| gvk.EnvoyFilter: {}, |
| gvk.WorkloadEntry: {}, |
| gvk.WorkloadGroup: {}, |
| gvk.AuthorizationPolicy: {}, |
| gvk.RequestAuthentication: {}, |
| gvk.PeerAuthentication: {}, |
| gvk.WasmPlugin: {}, |
| } |
| |
| func ndsNeedsPush(req *model.PushRequest) bool { |
| if req == nil { |
| return true |
| } |
| if !req.Full { |
| // NDS only handles full push |
| return false |
| } |
| // If none set, we will always push |
| if len(req.ConfigsUpdated) == 0 { |
| return true |
| } |
| for config := range req.ConfigsUpdated { |
| if _, f := skippedNdsConfigs[config.Kind]; !f { |
| return true |
| } |
| } |
| return false |
| } |
| |
| func (n NdsGenerator) Generate(proxy *model.Proxy, _ *model.WatchedResource, req *model.PushRequest) (model.Resources, model.XdsLogDetails, error) { |
| if !ndsNeedsPush(req) { |
| return nil, model.DefaultXdsLogDetails, nil |
| } |
| nt := n.Server.ConfigGenerator.BuildNameTable(proxy, req.Push) |
| if nt == nil { |
| return nil, model.DefaultXdsLogDetails, nil |
| } |
| resources := model.Resources{&discovery.Resource{Resource: util.MessageToAny(nt)}} |
| return resources, model.DefaultXdsLogDetails, nil |
| } |