vain/cmd/ysvd/main.go
2016-02-14 22:20:10 -08:00

76 lines
1.4 KiB
Go

/*
command ysvd implements the
The "ysv" in ysvd stands for You're so Vain, the song by Carly Simon.
*/
package main
import (
"fmt"
"log"
"net/http"
"os"
"mcquay.me/vain"
"github.com/kelseyhightower/envconfig"
)
const usage = `ysvd
environment vars:
YSV_PORT: tcp listen port
YSV_HOST: hostname to use
YSV_DB: path to json database
`
type config struct {
Port int
Host string
DB string
}
func main() {
c := &config{
Port: 4040,
}
if err := envconfig.Process("ysv", c); err != nil {
fmt.Fprintf(os.Stderr, "problem processing environment: %v", err)
os.Exit(1)
}
if len(os.Args) > 1 {
switch os.Args[1] {
case "env", "e", "help", "h":
fmt.Printf("%s\n", usage)
os.Exit(0)
}
}
if c.Host == "" {
log.Printf("must set YSV_HOST; please run $(ysvd env) for more information")
os.Exit(1)
}
if c.DB == "" {
log.Printf("warning: in-memory db mode; if you do not want this set YSV_DB")
}
hostname := "localhost"
if hn, err := os.Hostname(); err != nil {
log.Printf("problem getting hostname:", err)
} else {
hostname = hn
}
log.Printf("serving at: http://%s:%d/", hostname, c.Port)
sm := http.NewServeMux()
ms := vain.NewMemStore(c.DB)
if err := ms.Load(); err != nil {
log.Printf("unable to load db: %v", err)
os.Exit(1)
}
vain.NewServer(sm, ms, c.Host)
addr := fmt.Sprintf(":%d", c.Port)
if err := http.ListenAndServe(addr, sm); err != nil {
log.Printf("problem with http server: %v", err)
os.Exit(1)
}
}