flags

main.go

package main

import (
	"flag"
	"log"
	
	"github.com/benbjohnson/myapp"
)

func main() {
	// Parse flags.
	connstr := flag.String("c", "", "connection string")
	addr := flag.String("addr", "", "bind address")
	num := flag.Int("num", 100, "number of things")
	flag.Parse()	
	
	// Validate flags here for prettier error messages.
	// Usually I'll just defer validation to the objects
	// which use the flags though.
	if *c == "" {
		log.Fatal("connection string required: -c")
	} else if *addr == "" {
		log.Fatal("bind address required: -addr")
	} else if *num < 0 {
		log.Fatal("num must be positive")
	}

	// Create my database.
	var db myapp.DB
	if err := db.Open(*connstr); err != nil {
		log.Fatal("db: ", err)
	}
	defer db.Close()
	
	// Create my server and attach the database.
	s, err := myapp.NewServer(db, *addr)
	if err != nil {
		log.Fatal("server: ", err)
	}
	defer s.Close()
	log.Fatal(s.ListenAndServe())
}