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main.go
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main.go
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package main
import (
"flag"
"fmt"
"log"
"net/http"
"os"
"strconv"
"github.com/go-serve/goserve/server"
)
var port *uint64
var dir string
func init() {
var envPort uint64 = 8080 // default port
var err error
// parse env for PORT parameter
if envPortStr := os.Getenv("PORT"); envPortStr != "" {
envPort, err = strconv.ParseUint(envPortStr, 10, 16)
if err != nil {
log.Fatalf(
"Cannot parse \"%s\" as PORT. Must be unsigned integer", envPortStr)
}
}
// flags, if any provided, may override the default
port = flag.Uint64("port", envPort, "Determine the port to serve")
flag.Parse()
// read directory from remaining argument
// or use current directory
if flag.NArg() == 1 {
dir = flag.Arg(0)
} else if flag.NArg() > 1 {
log.Fatalf("Too many argument. goserve can only serve one directory")
} else {
// get current dir
dir, err = os.Getwd()
if err != nil {
log.Fatalf("Failed to parse current path: %s", err.Error())
}
}
}
// test if a path is a valid directory
func validDir(path string) (err error) {
var f *os.File
var fi os.FileInfo
if f, err = os.Open(dir); err != nil {
return
}
if fi, err = f.Stat(); err != nil {
return
}
if !fi.IsDir() {
err = fmt.Errorf("Path \"%s\" is not a valid directory", path)
return
}
return
}
func fileServer(root string) http.Handler {
return server.FileServer(http.Dir(root))
}
func main() {
// check if provided dir is a valid dir
if err := validDir(dir); err != nil {
log.Fatal(err)
}
// port string for server
portStr := fmt.Sprintf(":%d", *port)
// some logs before starting
log.Printf("Listening to port %d", *port)
log.Printf("Serving path: %s", dir)
log.Fatal(http.ListenAndServe(portStr, fileServer(dir)))
}