docs: add examples for API

examples/worldcup/cli.go

@@ -0,0 +1,71 @@
+package main
+
+import (
+	"os"
+	"strings"
+
+	"github.com/rs/zerolog"
+	"github.com/rs/zerolog/log"
+	"github.com/spf13/cobra"
+)
+
+var rootCmd = &cobra.Command{
+	Use:     "wcl",
+	Short:   "Monitor FIFA World Cup Live",
+	Version: "0.1",
+	PreRun: func(cmd *cobra.Command, args []string) {
+		log.Logger = zerolog.New(
+			zerolog.ConsoleWriter{NoColor: false, Out: os.Stderr},
+		).With().Timestamp().Logger()
+		zerolog.SetGlobalLevel(zerolog.InfoLevel)
+		setLogLevel(logLevel)
+	},
+	RunE: func(cmd *cobra.Command, args []string) error {
+		wc := NewWorldCupLive(matchName, osType, duration, interval)
+		wc.Start()
+		wc.DumpResult()
+		return nil
+	},
+}
+
+var (
+	uuid      string
+	osType    string
+	duration  int
+	interval  int
+	logLevel  string
+	matchName string
+)
+
+func main() {
+	rootCmd.PersistentFlags().StringVarP(&logLevel, "log-level", "l", "INFO", "set log level")
+	rootCmd.PersistentFlags().StringVarP(&uuid, "uuid", "u", "", "specify device serial or udid")
+	rootCmd.PersistentFlags().StringVarP(&osType, "os-type", "t", "ios", "specify mobile os type")
+	rootCmd.PersistentFlags().IntVarP(&duration, "duration", "d", 30, "set duration in seconds")
+	rootCmd.PersistentFlags().IntVarP(&interval, "interval", "i", 15, "set interval in seconds")
+	rootCmd.PersistentFlags().StringVarP(&matchName, "match-name", "n", "", "specify match name")
+
+	err := rootCmd.Execute()
+	if err != nil {
+		os.Exit(1)
+	}
+}
+
+func setLogLevel(level string) {
+	level = strings.ToUpper(level)
+	log.Info().Str("level", level).Msg("Set log level")
+	switch level {
+	case "DEBUG":
+		zerolog.SetGlobalLevel(zerolog.DebugLevel)
+	case "INFO":
+		zerolog.SetGlobalLevel(zerolog.InfoLevel)
+	case "WARN":
+		zerolog.SetGlobalLevel(zerolog.WarnLevel)
+	case "ERROR":
+		zerolog.SetGlobalLevel(zerolog.ErrorLevel)
+	case "FATAL":
+		zerolog.SetGlobalLevel(zerolog.FatalLevel)
+	case "PANIC":
+		zerolog.SetGlobalLevel(zerolog.PanicLevel)
+	}
+}