mirror of https://github.com/prometheus/prometheus
89 lines
2.3 KiB
Go
89 lines
2.3 KiB
Go
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/*
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Copyright 2014 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 rest
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"path"
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"k8s.io/client-go/1.5/pkg/api/unversioned"
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)
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const (
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legacyAPIPath = "/api"
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defaultAPIPath = "/apis"
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)
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// TODO: Is this obsoleted by the discovery client?
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// ServerAPIVersions returns the GroupVersions supported by the API server.
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// It creates a RESTClient based on the passed in config, but it doesn't rely
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// on the Version and Codec of the config, because it uses AbsPath and
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// takes the raw response.
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func ServerAPIVersions(c *Config) (groupVersions []string, err error) {
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transport, err := TransportFor(c)
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if err != nil {
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return nil, err
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}
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client := http.Client{Transport: transport}
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configCopy := *c
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configCopy.GroupVersion = nil
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configCopy.APIPath = ""
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baseURL, _, err := defaultServerUrlFor(&configCopy)
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if err != nil {
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return nil, err
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}
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// Get the groupVersions exposed at /api
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originalPath := baseURL.Path
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baseURL.Path = path.Join(originalPath, legacyAPIPath)
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resp, err := client.Get(baseURL.String())
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if err != nil {
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return nil, err
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}
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var v unversioned.APIVersions
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defer resp.Body.Close()
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err = json.NewDecoder(resp.Body).Decode(&v)
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if err != nil {
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return nil, fmt.Errorf("unexpected error: %v", err)
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}
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groupVersions = append(groupVersions, v.Versions...)
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// Get the groupVersions exposed at /apis
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baseURL.Path = path.Join(originalPath, defaultAPIPath)
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resp2, err := client.Get(baseURL.String())
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if err != nil {
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return nil, err
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}
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var apiGroupList unversioned.APIGroupList
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defer resp2.Body.Close()
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err = json.NewDecoder(resp2.Body).Decode(&apiGroupList)
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if err != nil {
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return nil, fmt.Errorf("unexpected error: %v", err)
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}
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for _, g := range apiGroupList.Groups {
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for _, gv := range g.Versions {
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groupVersions = append(groupVersions, gv.GroupVersion)
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}
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}
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return groupVersions, nil
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}
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