| // 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 sidecar |
| |
| import ( |
| "fmt" |
| ) |
| |
| import ( |
| "istio.io/api/networking/v1alpha3" |
| "k8s.io/apimachinery/pkg/labels" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-go-pixiu/pkg/config/analysis" |
| "github.com/apache/dubbo-go-pixiu/pkg/config/analysis/analyzers/util" |
| "github.com/apache/dubbo-go-pixiu/pkg/config/analysis/msg" |
| "github.com/apache/dubbo-go-pixiu/pkg/config/resource" |
| "github.com/apache/dubbo-go-pixiu/pkg/config/schema/collection" |
| "github.com/apache/dubbo-go-pixiu/pkg/config/schema/collections" |
| ) |
| |
| // SelectorAnalyzer validates, per namespace, that: |
| // * sidecar resources that define a workload selector match at least one pod |
| // * there aren't multiple sidecar resources that select overlapping pods |
| type SelectorAnalyzer struct{} |
| |
| var _ analysis.Analyzer = &SelectorAnalyzer{} |
| |
| // Metadata implements Analyzer |
| func (a *SelectorAnalyzer) Metadata() analysis.Metadata { |
| return analysis.Metadata{ |
| Name: "sidecar.SelectorAnalyzer", |
| Description: "Validates that sidecars that define a workload selector " + |
| "match at least one pod, and that there aren't multiple sidecar resources that select overlapping pods", |
| Inputs: collection.Names{ |
| collections.IstioNetworkingV1Alpha3Sidecars.Name(), |
| collections.K8SCoreV1Pods.Name(), |
| }, |
| } |
| } |
| |
| // Analyze implements Analyzer |
| func (a *SelectorAnalyzer) Analyze(c analysis.Context) { |
| podsToSidecars := make(map[resource.FullName][]*resource.Instance) |
| |
| // This is using an unindexed approach for matching selectors. |
| // Using an index for selectoes is problematic because selector != label |
| // We can match a label to a selector, but we can't generate a selector from a label. |
| c.ForEach(collections.IstioNetworkingV1Alpha3Sidecars.Name(), func(rs *resource.Instance) bool { |
| s := rs.Message.(*v1alpha3.Sidecar) |
| |
| // For this analysis, ignore Sidecars with no workload selectors specified at all. |
| if s.WorkloadSelector == nil || len(s.WorkloadSelector.Labels) == 0 { |
| return true |
| } |
| |
| sNs := rs.Metadata.FullName.Namespace |
| sel := labels.SelectorFromSet(s.WorkloadSelector.Labels) |
| |
| foundPod := false |
| c.ForEach(collections.K8SCoreV1Pods.Name(), func(rp *resource.Instance) bool { |
| pNs := rp.Metadata.FullName.Namespace |
| podLabels := labels.Set(rp.Metadata.Labels) |
| |
| // Only attempt to match in the same namespace |
| if pNs != sNs { |
| return true |
| } |
| |
| if sel.Matches(podLabels) { |
| foundPod = true |
| podsToSidecars[rp.Metadata.FullName] = append(podsToSidecars[rp.Metadata.FullName], rs) |
| } |
| |
| return true |
| }) |
| |
| if !foundPod { |
| m := msg.NewReferencedResourceNotFound(rs, "selector", sel.String()) |
| |
| label := util.ExtractLabelFromSelectorString(sel.String()) |
| if line, ok := util.ErrorLine(rs, fmt.Sprintf(util.WorkloadSelector, label)); ok { |
| m.Line = line |
| } |
| |
| c.Report(collections.IstioNetworkingV1Alpha3Sidecars.Name(), m) |
| } |
| |
| return true |
| }) |
| |
| for p, sList := range podsToSidecars { |
| if len(sList) == 1 { |
| continue |
| } |
| |
| sNames := getNames(sList) |
| |
| for _, rs := range sList { |
| |
| m := msg.NewConflictingSidecarWorkloadSelectors(rs, sNames, |
| p.Namespace.String(), p.Name.String()) |
| |
| if line, ok := util.ErrorLine(rs, fmt.Sprintf(util.MetadataName)); ok { |
| m.Line = line |
| } |
| |
| c.Report(collections.IstioNetworkingV1Alpha3Sidecars.Name(), m) |
| } |
| } |
| } |