mirror of
https://github.com/kubernetes-sigs/prometheus-adapter.git
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a293b2bf94
Travis seems to be having issues pulling deps, so we'll have to check in the vendor directory and prevent the makefile from trying to regenerate it normally.
135 lines
4.2 KiB
Go
135 lines
4.2 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package discovery
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import (
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"net/http"
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"sync"
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restful "github.com/emicklei/go-restful"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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utilnet "k8s.io/apimachinery/pkg/util/net"
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"k8s.io/apiserver/pkg/endpoints/handlers/negotiation"
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"k8s.io/apiserver/pkg/endpoints/handlers/responsewriters"
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)
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// GroupManager is an interface that allows dynamic mutation of the existing webservice to handle
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// API groups being added or removed.
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type GroupManager interface {
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AddGroup(apiGroup metav1.APIGroup)
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RemoveGroup(groupName string)
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WebService() *restful.WebService
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}
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// rootAPIsHandler creates a webservice serving api group discovery.
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// The list of APIGroups may change while the server is running because additional resources
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// are registered or removed. It is not safe to cache the values.
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type rootAPIsHandler struct {
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// addresses is used to build cluster IPs for discovery.
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addresses Addresses
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serializer runtime.NegotiatedSerializer
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// Map storing information about all groups to be exposed in discovery response.
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// The map is from name to the group.
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lock sync.RWMutex
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apiGroups map[string]metav1.APIGroup
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// apiGroupNames preserves insertion order
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apiGroupNames []string
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}
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func NewRootAPIsHandler(addresses Addresses, serializer runtime.NegotiatedSerializer) *rootAPIsHandler {
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// Because in release 1.1, /apis returns response with empty APIVersion, we
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// use stripVersionNegotiatedSerializer to keep the response backwards
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// compatible.
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serializer = stripVersionNegotiatedSerializer{serializer}
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return &rootAPIsHandler{
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addresses: addresses,
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serializer: serializer,
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apiGroups: map[string]metav1.APIGroup{},
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}
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}
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func (s *rootAPIsHandler) AddGroup(apiGroup metav1.APIGroup) {
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s.lock.Lock()
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defer s.lock.Unlock()
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_, alreadyExists := s.apiGroups[apiGroup.Name]
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s.apiGroups[apiGroup.Name] = apiGroup
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if !alreadyExists {
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s.apiGroupNames = append(s.apiGroupNames, apiGroup.Name)
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}
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}
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func (s *rootAPIsHandler) RemoveGroup(groupName string) {
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s.lock.Lock()
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defer s.lock.Unlock()
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delete(s.apiGroups, groupName)
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for i := range s.apiGroupNames {
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if s.apiGroupNames[i] == groupName {
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s.apiGroupNames = append(s.apiGroupNames[:i], s.apiGroupNames[i+1:]...)
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break
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}
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}
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}
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func (s *rootAPIsHandler) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
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s.lock.RLock()
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defer s.lock.RUnlock()
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orderedGroups := []metav1.APIGroup{}
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for _, groupName := range s.apiGroupNames {
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orderedGroups = append(orderedGroups, s.apiGroups[groupName])
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}
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clientIP := utilnet.GetClientIP(req)
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serverCIDR := s.addresses.ServerAddressByClientCIDRs(clientIP)
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groups := make([]metav1.APIGroup, len(orderedGroups))
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for i := range orderedGroups {
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groups[i] = orderedGroups[i]
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groups[i].ServerAddressByClientCIDRs = serverCIDR
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}
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responsewriters.WriteObjectNegotiated(s.serializer, schema.GroupVersion{}, resp, req, http.StatusOK, &metav1.APIGroupList{Groups: groups})
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}
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func (s *rootAPIsHandler) restfulHandle(req *restful.Request, resp *restful.Response) {
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s.ServeHTTP(resp.ResponseWriter, req.Request)
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}
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// WebService returns a webservice serving api group discovery.
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// Note: during the server runtime apiGroups might change.
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func (s *rootAPIsHandler) WebService() *restful.WebService {
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mediaTypes, _ := negotiation.MediaTypesForSerializer(s.serializer)
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ws := new(restful.WebService)
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ws.Path(APIGroupPrefix)
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ws.Doc("get available API versions")
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ws.Route(ws.GET("/").To(s.restfulHandle).
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Doc("get available API versions").
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Operation("getAPIVersions").
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Produces(mediaTypes...).
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Consumes(mediaTypes...).
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Writes(metav1.APIGroupList{}))
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return ws
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}
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