Add a sub-cmd to print status of Jenkins update center

app/cmd/center.go

+package cmd
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/linuxsuren/jenkins-cli/client"
+	"github.com/spf13/cobra"
+)
+
+func init() {
+	rootCmd.AddCommand(centerCmd)
+}
+
+var centerCmd = &cobra.Command{
+	Use:   "center",
+	Short: "Manage your update center",
+	Long:  `Manage your update center`,
+	Run: func(cmd *cobra.Command, args []string) {
+		jenkins := getCurrentJenkins()
+		jclient := &client.UpdateCenterManager{}
+		jclient.URL = jenkins.URL
+		jclient.UserName = jenkins.UserName
+		jclient.Token = jenkins.Token
+
+		if status, err := jclient.Status(); err == nil {
+			fmt.Println("RestartRequiredForCompletion:", status.RestartRequiredForCompletion)
+			if status.Jobs != nil {
+				for i, job := range status.Jobs {
+					fmt.Printf("%d, %s, %s\n", i, job.Type, job.ErrorMessage)
+				}
+			}
+		} else {
+			log.Fatal(err)
+		}
+	},
+}

client/updateCenter.go

+package client
+
+import (
+	"crypto/tls"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/http"
+)
+
+// UpdateCenterManager manages the UpdateCenter
+type UpdateCenterManager struct {
+	JenkinsCore
+}
+
+// UpdateCenter represents the update center of Jenkins
+type UpdateCenter struct {
+	Availables                   []Plugin
+	Jobs                         []UpdateCenterJob
+	RestartRequiredForCompletion bool
+	Sites                        []CenterSite
+}
+
+// UpdateCenterJob represents the job for updateCenter which execute a task
+type UpdateCenterJob struct {
+	ErrorMessage string
+	ID           int `json:"id"`
+	Type         string
+}
+
+// CenterSite represents the site of update center
+type CenterSite struct {
+	ConnectionCheckURL string `json:"connectionCheckUrl"`
+	HasUpdates         bool
+	ID                 string `json:"id"`
+	URL                string `json:"url"`
+}
+
+func (u *UpdateCenterManager) Status() (status *UpdateCenter, err error) {
+	api := fmt.Sprintf("%s/updateCenter/api/json?pretty=false&depth=1", u.URL)
+	var (
+		req      *http.Request
+		response *http.Response
+	)
+
+	req, err = http.NewRequest("GET", api, nil)
+	if err == nil {
+		u.AuthHandle(req)
+	} else {
+		return
+	}
+
+	tr := &http.Transport{
+		TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
+	}
+	client := &http.Client{Transport: tr}
+	if response, err = client.Do(req); err == nil {
+		code := response.StatusCode
+		var data []byte
+		data, err = ioutil.ReadAll(response.Body)
+		if code == 200 {
+			if err == nil {
+				status = &UpdateCenter{}
+				err = json.Unmarshal(data, status)
+			}
+		} else {
+			log.Fatal(string(data))
+		}
+	} else {
+		log.Fatal(err)
+	}
+	return
+}