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describe.go
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describe.go
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package cmd
import (
"bufio"
"fmt"
"github.com/spf13/cobra"
"io"
"k8s.io/klog/v2"
"os"
"os/exec"
)
const (
describeDesc = `'describe' command displays the NineCluster's detail information`
describeExample = ` kubectl nine describe c1 --namespace c1-ns`
)
type describeCmd struct {
out io.Writer
errOut io.Writer
name string
ns string
}
func newClusterDescribeCmd(out io.Writer, errOut io.Writer) *cobra.Command {
c := &describeCmd{out: out, errOut: errOut}
cmd := &cobra.Command{
Use: "describe <NINECLUSTERNAME> --namespace <NINECLUSTERNS>",
Short: "Display the NineCluster's detail information",
Long: describeDesc,
Example: describeExample,
Args: func(cmd *cobra.Command, args []string) error {
return c.validate(args)
},
RunE: func(cmd *cobra.Command, args []string) error {
err := c.run(args)
if err != nil {
klog.Warning(err)
return err
}
return nil
},
}
cmd = DisableHelp(cmd)
f := cmd.Flags()
f.StringVarP(&c.ns, "namespace", "n", "", "k8s namespace for this ninecluster")
return cmd
}
func (d *describeCmd) validate(args []string) error {
d.name = args[0]
return ValidateClusterArgs("describe", args)
}
func (d *describeCmd) run(_ []string) error {
path, _ := rootCmd.Flags().GetString(kubeconfig)
parameters := []string{"describe", "ninecluster", d.name, "-n", d.ns}
if path != "" {
parameters = append(parameters, []string{"--kubeconfig", path}...)
}
cmd := exec.Command("kubectl", parameters...)
stdoutReader, _ := cmd.StdoutPipe()
stdoutScanner := bufio.NewScanner(stdoutReader)
go func() {
for stdoutScanner.Scan() {
fmt.Println(stdoutScanner.Text())
}
}()
stderrReader, _ := cmd.StderrPipe()
stderrScanner := bufio.NewScanner(stderrReader)
go func() {
for stderrScanner.Scan() {
fmt.Println(stderrScanner.Text())
}
}()
err := cmd.Start()
if err != nil {
fmt.Printf("Error : %v \n", err)
os.Exit(1)
}
err = cmd.Wait()
if err != nil {
fmt.Printf("Error: %v \n", err)
os.Exit(1)
}
return nil
}