message-pusher/common/init.go

package common

import (
	"flag"
	"fmt"
	"log"
	"os"
	"path/filepath"
)

var (
	Port         = flag.Int("port", 3000, "the listening port")
	PrintVersion = flag.Bool("version", false, "print version and exit")
	LogDir       = flag.String("log-dir", "", "specify the log directory")
)

func init() {
	flag.Parse()

	if *PrintVersion {
		fmt.Println(Version)
		os.Exit(0)
	}

	if os.Getenv("SESSION_SECRET") != "" {
		SessionSecret = os.Getenv("SESSION_SECRET")
	}
	if os.Getenv("SQLITE_PATH") != "" {
		SQLitePath = os.Getenv("SQLITE_PATH")
	}
	if *LogDir != "" {
		var err error
		*LogDir, err = filepath.Abs(*LogDir)
		if err != nil {
			log.Fatal(err)
		}
		if _, err := os.Stat(*LogDir); os.IsNotExist(err) {
			err = os.Mkdir(*LogDir, 0777)
			if err != nil {
				log.Fatal(err)
			}
		}
	}
}