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main.go
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main.go
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package main
import (
"context"
"errors"
"flag"
"fmt"
"io/fs"
"log"
"net/http"
"os"
"os/signal"
"path/filepath"
"time"
"github.com/meblum/serv"
)
func logInvalidPath(dirPath string) {
notDirMsg := fmt.Sprintf("warning: %q is not an existing directory", dirPath)
fileInfo, err := os.Stat(dirPath)
switch {
case errors.Is(err, fs.ErrNotExist):
log.Println(notDirMsg)
case err != nil:
log.Println(err)
case !fileInfo.IsDir():
log.Println(notDirMsg)
}
}
func main() {
log.SetFlags(0)
port := 8080
dir := "."
noReload := false
fs := flag.NewFlagSet(filepath.Base(os.Args[0]), flag.ExitOnError)
fs.Usage = func() {
fmt.Fprintf(fs.Output(), "Usage: %s [directory (default \".\")] [-option]\n", fs.Name())
fs.PrintDefaults()
}
fs.IntVar(&port, "port", port, "port to serve on")
fs.BoolVar(&noReload, "no-reload", noReload, "serve without reloading on file update")
fs.Parse(os.Args[1:])
arg := fs.Arg(0)
if arg != "" {
dir = arg
}
logInvalidPath(dir)
sseContext, cancelSSE := context.WithCancel(context.Background())
defer cancelSSE()
fServer := serv.FileServer(sseContext, os.DirFS(dir))
if noReload {
fServer = http.FileServer(http.FS(os.DirFS(dir)))
}
http.Handle("/", fServer)
srv := &http.Server{Addr: fmt.Sprintf(":%v", port)}
srv.RegisterOnShutdown(cancelSSE)
shutdown := make(chan os.Signal, 1)
signal.Notify(shutdown, os.Interrupt)
go func() {
log.Printf("serving files in \"%v\" at http://localhost%v", dir, srv.Addr)
err := srv.ListenAndServe()
if err != http.ErrServerClosed {
log.Println(err)
os.Exit(1)
}
}()
<-shutdown
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
defer cancel()
if err := srv.Shutdown(ctx); err != nil {
log.Println(err)
os.Exit(1)
}
}