github.com/kubewharf/katalyst-core@v0.5.3/pkg/util/native/kubelet.go (about) 1 /* 2 Copyright 2022 The Katalyst Authors. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package native 18 19 import ( 20 "context" 21 "encoding/json" 22 "fmt" 23 "net/url" 24 "os" 25 "time" 26 27 "k8s.io/client-go/discovery" 28 "k8s.io/client-go/rest" 29 ) 30 31 const ( 32 defaultTimeout = time.Second * 10 33 ) 34 35 // GetAndUnmarshalForHttps gets data from the given url and unmarshal it into the given struct. 36 func GetAndUnmarshalForHttps(ctx context.Context, port int, nodeAddress, endpoint, authTokenFile string, v interface{}) error { 37 uri, err := generateURI(port, nodeAddress, endpoint) 38 if err != nil { 39 return err 40 } 41 restConfig, err := insecureConfig(uri, authTokenFile) 42 if err != nil { 43 return fmt.Errorf("failed to initialize rest config for kubelet config uri: %w", err) 44 } 45 46 discoveryClient, err := discovery.NewDiscoveryClientForConfig(restConfig) 47 if err != nil { 48 return err 49 } 50 51 bytes, err := discoveryClient.RESTClient(). 52 Get(). 53 Timeout(defaultTimeout). 54 Do(ctx). 55 Raw() 56 if err != nil { 57 return err 58 } 59 60 if err = json.Unmarshal(bytes, v); err != nil { 61 return fmt.Errorf("failed to unmarshal json for kubelet config: %w", err) 62 } 63 64 return nil 65 } 66 67 func generateURI(port int, nodeAddress, endpoint string) (string, error) { 68 if nodeAddress == "" { 69 return "", fmt.Errorf("node address is empty") 70 } 71 72 u, err := url.ParseRequestURI(fmt.Sprintf("https://%s:%d%s", nodeAddress, port, endpoint)) 73 if err != nil { 74 return "", fmt.Errorf("failed to parse -kubelet-config-uri: %w", err) 75 } 76 77 return u.String(), nil 78 } 79 80 func insecureConfig(host, tokenFile string) (*rest.Config, error) { 81 if tokenFile == "" { 82 return nil, fmt.Errorf("api auth token file must be defined") 83 } 84 if len(host) == 0 { 85 return nil, fmt.Errorf("kubelet host must be defined") 86 } 87 88 token, err := os.ReadFile(tokenFile) 89 if err != nil { 90 return nil, err 91 } 92 93 tlsClientConfig := rest.TLSClientConfig{Insecure: true} 94 95 return &rest.Config{ 96 Host: host, 97 TLSClientConfig: tlsClientConfig, 98 BearerToken: string(token), 99 BearerTokenFile: tokenFile, 100 }, nil 101 }