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Merge pull request #1996 from rambohe-ch/add-forwardkubesvctraffic-fi…
…lter add forwardkubesvctraffic filter and adapt server certificate
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| /* | ||
| Copyright 2024 The OpenYurt 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 forwardkubesvctraffic | ||
|
|
||
| import ( | ||
| "strconv" | ||
|
|
||
| discovery "k8s.io/api/discovery/v1" | ||
| "k8s.io/apimachinery/pkg/runtime" | ||
| "k8s.io/apimachinery/pkg/util/sets" | ||
| "k8s.io/klog/v2" | ||
| utilnet "k8s.io/utils/net" | ||
|
|
||
| "github.com/openyurtio/openyurt/pkg/yurthub/filter" | ||
| "github.com/openyurtio/openyurt/pkg/yurthub/filter/base" | ||
| ) | ||
|
|
||
| const ( | ||
| // FilterName filter is used to mutate the default/kubernetes endpointslices | ||
| // in order to make pods on edge nodes can access kube-apiserver directly by default/kubernetes service. | ||
| FilterName = "forwardkubesvctraffic" | ||
|
|
||
| KubeSVCNamespace = "default" | ||
| KubeSVCName = "kubernetes" | ||
| KubeSVCPortName = "https" | ||
| ) | ||
|
|
||
| // Register registers a filter | ||
| func Register(filters *base.Filters) { | ||
| filters.Register(FilterName, func() (filter.ObjectFilter, error) { | ||
| return NewForwardKubeSVCTrafficFilter() | ||
| }) | ||
| } | ||
|
|
||
| func NewForwardKubeSVCTrafficFilter() (*forwardKubeSVCTrafficFilter, error) { | ||
| return &forwardKubeSVCTrafficFilter{addressType: discovery.AddressTypeIPv4}, nil | ||
| } | ||
|
|
||
| type forwardKubeSVCTrafficFilter struct { | ||
| addressType discovery.AddressType | ||
| host string | ||
| port int32 | ||
| } | ||
|
|
||
| func (fkst *forwardKubeSVCTrafficFilter) Name() string { | ||
| return FilterName | ||
| } | ||
|
|
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| func (fkst *forwardKubeSVCTrafficFilter) SupportedResourceAndVerbs() map[string]sets.String { | ||
| return map[string]sets.String{ | ||
| "endpointslices": sets.NewString("list", "watch"), | ||
| } | ||
| } | ||
|
|
||
| func (fkst *forwardKubeSVCTrafficFilter) SetMasterServiceHost(host string) error { | ||
| fkst.host = host | ||
| if utilnet.IsIPv6String(host) { | ||
| fkst.addressType = discovery.AddressTypeIPv6 | ||
| } | ||
| return nil | ||
|
|
||
| } | ||
|
|
||
| func (fkst *forwardKubeSVCTrafficFilter) SetMasterServicePort(portStr string) error { | ||
| port, err := strconv.ParseInt(portStr, 10, 32) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| fkst.port = int32(port) | ||
| return nil | ||
| } | ||
|
|
||
| func (fkst *forwardKubeSVCTrafficFilter) Filter(obj runtime.Object, stopCh <-chan struct{}) runtime.Object { | ||
| switch v := obj.(type) { | ||
| case *discovery.EndpointSlice: | ||
| fkst.mutateDefaultKubernetesEps(v) | ||
| return v | ||
| default: | ||
| return obj | ||
| } | ||
| } | ||
|
|
||
| func (fkst *forwardKubeSVCTrafficFilter) mutateDefaultKubernetesEps(eps *discovery.EndpointSlice) { | ||
| trueCondition := true | ||
| if eps.Namespace == KubeSVCNamespace && eps.Name == KubeSVCName { | ||
| if eps.AddressType != fkst.addressType { | ||
| klog.Warningf("address type of default/kubernetes endpoinstlice(%s) and hub server is different(%s), hub server address type need to be configured", eps.AddressType, fkst.addressType) | ||
| return | ||
| } | ||
| for j := range eps.Ports { | ||
| if eps.Ports[j].Name != nil && *eps.Ports[j].Name == KubeSVCPortName { | ||
| eps.Ports[j].Port = &fkst.port | ||
| break | ||
| } | ||
| } | ||
| eps.Endpoints = []discovery.Endpoint{ | ||
| { | ||
| Addresses: []string{fkst.host}, | ||
| Conditions: discovery.EndpointConditions{ | ||
| Ready: &trueCondition, | ||
| }, | ||
| }, | ||
| } | ||
| klog.V(2).Infof("mutate default/kubernetes endpointslice to %v in forwardkubesvctraffic filter", *eps) | ||
| } | ||
| return | ||
| } |
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