/
kubectl.go
105 lines (94 loc) · 2.45 KB
/
kubectl.go
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// Copyright 2019 Santhosh Kumar Tekuri
//
// 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 main
import (
"crypto/tls"
"crypto/x509"
"errors"
"io"
"io/ioutil"
"net"
"net/http"
"os"
"github.com/santhosh-tekuri/json"
)
var (
kubeClient *http.Client
base string
auth string
)
func init() {
host, port := os.Getenv("KUBERNETES_SERVICE_HOST"), os.Getenv("KUBERNETES_SERVICE_PORT")
if len(host) == 0 || len(port) == 0 {
return
}
base = "https://" + net.JoinHostPort(host, port) + "/api/v1"
b, err := ioutil.ReadFile("/var/run/secrets/kubernetes.io/serviceaccount/token")
if err != nil {
panic(err)
}
auth = "Bearer " + string(b)
b, err = ioutil.ReadFile("/var/run/secrets/kubernetes.io/serviceaccount/ca.crt")
if err != nil {
panic(err)
}
certPool := x509.NewCertPool()
certPool.AppendCertsFromPEM(b)
kubeClient = &http.Client{
Transport: &http.Transport{
TLSClientConfig: &tls.Config{
RootCAs: certPool,
},
},
}
}
//go:generate jsonc -o kubectl_json.go pod
type pod struct {
Metadata struct {
Labels map[string]interface{} `json:"labels"`
Annotations map[string]string `json:"annotations"`
} `json:"metadata"`
Spec struct {
NodeName string `json:"nodeName"`
} `json:"spec"`
}
var errNonKubernetes = errors.New("non kubernetes environment")
func getPod(ns, podName string) (pod, error) {
if kubeClient == nil {
return pod{}, errNonKubernetes
}
req, err := http.NewRequest(http.MethodGet, base+"/namespaces/"+ns+"/pods/"+podName, http.NoBody)
if err != nil {
panic(err)
}
req.Header.Add("Authorization", auth)
resp, err := kubeClient.Do(req)
if err != nil {
return pod{}, err
}
defer func() {
_, _ = io.Copy(os.Stdout, resp.Body)
_ = resp.Body.Close()
}()
switch resp.StatusCode {
case http.StatusNotFound:
return pod{}, nil
case http.StatusOK:
var p pod
err = p.DecodeJSON(json.NewReadDecoder(resp.Body))
return p, err
default:
return pod{}, errors.New(resp.Status)
}
}