Add CLI support for volume statedump

Usage:

$ glustercli volume statedump <volname>
$ glustercli volume statedump <volname> --quotad
$ glustercli volume statedump <volname> --client <ip>:<pid>

Signed-off-by: Prashanth Pai <ppai@redhat.com>

glustercli/cmd/volume-statedump.go

@@ -0,0 +1,84 @@
+package cmd
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/gluster/glusterd2/pkg/api"
+
+	"github.com/spf13/cobra"
+)
+
+var (
+	flagStatedumpClient string
+	flagStatedumpQuotad bool
+
+	volumeStatedumpCmd = &cobra.Command{
+		Use:   "statedump <volname> [--quota] [--client=<host>:<pid>]",
+		Short: "Generate statedump of of a volume",
+		Long:  "Generate statedump of various processes (bricks, client, quota) of a volume. Takes statedump of all bricks by default.",
+		Args:  volumeStatedumpCmdArgs,
+		Run:   volumeStatedumpCmdRun,
+	}
+)
+
+func init() {
+	volumeStatedumpCmd.Flags().StringVar(&flagStatedumpClient, "client", "", "client process in the format <ip>:<pid>")
+	volumeStatedumpCmd.Flags().BoolVar(&flagStatedumpQuotad, "quota", false, "generate statedump of quotad process")
+	volumeCmd.AddCommand(volumeStatedumpCmd)
+}
+
+func volumeStatedumpCmdArgs(cmd *cobra.Command, args []string) error {
+
+	if len(args) != 1 {
+		return errors.New("need exactly one argument i.e name of the volume")
+	}
+
+	if _, err := cmd.Flags().GetBool("quota"); err != nil {
+		return err
+	}
+
+	if cmd.Flags().Changed("client") {
+		client, err := cmd.Flags().GetString("client")
+		if err != nil {
+			return err
+		}
+
+		s := strings.Split(client, ":")
+		if len(s) != 2 {
+			return errors.New("client must be specified in the format <ip>:<pid>")
+		}
+
+		pid, err := strconv.Atoi(s[1])
+		if err != nil || pid < 0 {
+			return fmt.Errorf("invalid pid specified: %s", s[1])
+		}
+	}
+
+	return nil
+}
+
+func volumeStatedumpCmdRun(cmd *cobra.Command, args []string) {
+
+	var req api.VolStatedumpReq
+
+	if cmd.Flags().Changed("quota") {
+		req.Quota, _ = cmd.Flags().GetBool("quota")
+	} else if cmd.Flags().Changed("client") {
+		// validation is already done in volumeStatedumpCmdArgs()
+		s := strings.Split(cmd.Flag("client").Value.String(), ":")
+		pid, _ := strconv.Atoi(s[1])
+		req.Client.Host = s[0]
+		req.Client.Pid = pid
+	} else {
+		// TODO: The REST API doesn't support taking statedump of a single specified brick.
+		req.Bricks = true
+	}
+
+	volname := args[0]
+	if err := client.VolumeStatedump(volname, req); err != nil {
+		fmt.Println(err)
+	}
+}