Use cobra for tools

tools/asynqmon/cmd/stats.go

@@ -0,0 +1,66 @@
+package cmd
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"strings"
+	"text/tabwriter"
+
+	"github.com/go-redis/redis/v7"
+	"github.com/hibiken/asynq/internal/rdb"
+	"github.com/spf13/cobra"
+)
+
+// statsCmd represents the stats command
+var statsCmd = &cobra.Command{
+	Use:   "stats",
+	Short: "Shows current state of the queues",
+	Long: `Stats command shows the number of tasks in each queue at that instant.
+
+To monitor the queues continuously, it's recommended that you run this
+command in conjunction with the watch command.
+
+Example: watch -n 5 asynqmon stats`,
+	Run: func(cmd *cobra.Command, args []string) {
+		stats(cmd, args)
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(statsCmd)
+
+	// Here you will define your flags and configuration settings.
+
+	// Cobra supports Persistent Flags which will work for this command
+	// and all subcommands, e.g.:
+	// statsCmd.PersistentFlags().String("foo", "", "A help for foo")
+
+	// Cobra supports local flags which will only run when this command
+	// is called directly, e.g.:
+	// statsCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+}
+
+func stats(cmd *cobra.Command, args []string) {
+	c := redis.NewClient(&redis.Options{
+		Addr: "localhost:6379",
+		DB:   2,
+	})
+	r := rdb.NewRDB(c)
+
+	stats, err := r.CurrentStats()
+	if err != nil {
+		log.Fatal(err)
+	}
+	printStats(stats)
+	fmt.Println()
+}
+
+func printStats(s *rdb.Stats) {
+	format := strings.Repeat("%v\t", 5) + "\n"
+	tw := new(tabwriter.Writer).Init(os.Stdout, 0, 8, 2, ' ', 0)
+	fmt.Fprintf(tw, format, "Enqueued", "InProgress", "Scheduled", "Retry", "Dead")
+	fmt.Fprintf(tw, format, "--------", "----------", "---------", "-----", "----")
+	fmt.Fprintf(tw, format, s.Enqueued, s.InProgress, s.Scheduled, s.Retry, s.Dead)
+	tw.Flush()
+}