Add history command to asynqmon tool

tools/asynqmon/cmd/history.go

@@ -0,0 +1,86 @@
+// Copyright 2020 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package cmd
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	"text/tabwriter"
+
+	"github.com/go-redis/redis/v7"
+	"github.com/hibiken/asynq/internal/rdb"
+	"github.com/spf13/cobra"
+)
+
+// historyCmd represents the history command
+var historyCmd = &cobra.Command{
+	Use:   "history [num of days]",
+	Short: "Shows historical aggregate data",
+	Long: `History (asynqmon history) will show the number of processed tasks
+as well as the error rate for the last n days.
+
+Example: asynqmon history 7 -> Shows stats from the last 7 days`,
+	Args: cobra.ExactArgs(1),
+	Run:  history,
+}
+
+func init() {
+	rootCmd.AddCommand(historyCmd)
+
+	// Here you will define your flags and configuration settings.
+
+	// Cobra supports Persistent Flags which will work for this command
+	// and all subcommands, e.g.:
+	// historyCmd.PersistentFlags().String("foo", "", "A help for foo")
+
+	// Cobra supports local flags which will only run when this command
+	// is called directly, e.g.:
+	// historyCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+}
+
+func history(cmd *cobra.Command, args []string) {
+	n, err := strconv.Atoi(args[0])
+	if err != nil {
+		fmt.Printf(`Error: Invalid argument. Argument has to be an integer.
+
+Usage: asynqmon history [num of days]
+`)
+		os.Exit(1)
+	}
+	if err != nil {
+
+	}
+	c := redis.NewClient(&redis.Options{
+		Addr: uri,
+		DB:   db,
+	})
+	r := rdb.NewRDB(c)
+
+	stats, err := r.HistoricalStats(n)
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	printDailyStats(stats)
+}
+
+func printDailyStats(stats []*rdb.DailyStats) {
+	format := strings.Repeat("%v\t", 4) + "\n"
+	tw := new(tabwriter.Writer).Init(os.Stdout, 0, 8, 2, ' ', 0)
+	fmt.Fprintf(tw, format, "Date (UTC)", "Processed", "Failed", "Error Rate")
+	fmt.Fprintf(tw, format, "----------", "---------", "------", "----------")
+	for _, s := range stats {
+		var errrate string
+		if s.Processed == 0 {
+			errrate = "N/A"
+		} else {
+			errrate = fmt.Sprintf("%.2f%%", float64(s.Failed)/float64(s.Processed)*100)
+		}
+		fmt.Fprintf(tw, format, s.Time.Format("2006-01-02"), s.Processed, s.Failed, errrate)
+	}
+	tw.Flush()
+}