From 487ce4dc647a8aa17123acf193765bf08e2f1e2d Mon Sep 17 00:00:00 2001
From: Vidhu Kant Sharma <vidhukant@vidhukant.xyz>
Date: Sat, 31 Dec 2022 00:19:33 +0530
Subject: starting/stopping webserver works now

---
 main.go | 82 ++++++++++++++++++++++++++++++++++++++++++++++-------------------
 1 file changed, 58 insertions(+), 24 deletions(-)

diff --git a/main.go b/main.go
index f91fa14..ce6ae8e 100644
--- a/main.go
+++ b/main.go
@@ -2,56 +2,90 @@ package main
 
 import (
 	"os"
-	"fmt"
 	"net/http"
+	"log"
 	"github.com/gotk3/gotk3/glib"
 	"github.com/gotk3/gotk3/gtk"
+	"context"
+	"sync"
 )
 
-func serve(port, dir string) {
-	http.Handle("/", http.FileServer(http.Dir(dir)))
-	http.ListenAndServe(":" + port, nil)
+func serve(port, dir string, wg *sync.WaitGroup) *http.Server {
+	mux := http.NewServeMux()
+	mux.Handle("/", http.FileServer(http.Dir(dir)))
+    server := &http.Server{Addr: ":" + port, Handler: mux}
+
+    go func() {
+        defer wg.Done()
+
+        if err := server.ListenAndServe(); err != http.ErrServerClosed {
+			// TODO: show error in GTK error window
+            log.Fatalf("ListenAndServe(): %v", err)
+        }
+    }()
+
+    return server
 }
 
+
 func main() {
-    app, _ := gtk.ApplicationNew("net.mikunonaka.fileserver", glib.APPLICATION_FLAGS_NONE)
-    app.Connect("activate", func() { onActivate(app) })
-    app.Run(os.Args)
+	app, _ := gtk.ApplicationNew("net.mikunonaka.fileserver", glib.APPLICATION_FLAGS_NONE)
+	app.Connect("activate", func() { onActivate(app) })
+	app.Run(os.Args)
 }
 
 func onActivate(app *gtk.Application) {
 	win, _ := gtk.ApplicationWindowNew(app)
-    win.SetTitle("HTTP File Server")
-    win.SetDefaultSize(400, 400)
+	win.SetTitle("HTTP File Server")
+	win.SetDefaultSize(400, 400)
 
-	grid, _ := gtk.GridNew()
-	grid.SetOrientation(gtk.ORIENTATION_VERTICAL)
+	box, _ := gtk.BoxNew(gtk.ORIENTATION_VERTICAL, 0)
 
+	dirBox, _ := gtk.BoxNew(gtk.ORIENTATION_HORIZONTAL, 0)
 	dirLabel, _ := gtk.LabelNew("Directory to serve: ")
-	grid.Attach(dirLabel, 0, 0, 1, 1)
-    dirInput, _ := gtk.EntryNew()
-	grid.Attach(dirInput, 1, 0, 2, 1)
+	dirBox.PackStart(dirLabel, false, false, 5)
+	dirInput, _ := gtk.EntryNew()
+	dirBox.PackEnd(dirInput, false, false, 5)
+	box.PackStart(dirBox, false, false, 5)
 
+	portBox, _ := gtk.BoxNew(gtk.ORIENTATION_HORIZONTAL, 0)
 	portLabel, _ := gtk.LabelNew("Port:")
-	grid.Attach(portLabel, 0, 1, 1, 1)
-    portInput, _ := gtk.EntryNew()
-	grid.Attach(portInput, 1, 1, 2, 1)
+	portBox.PackStart(portLabel, false, false, 5)
+	portInput, _ := gtk.EntryNew()
+	portBox.PackEnd(portInput, false, false, 5)
+	box.PackStart(portBox, false, false, 5)
 
+	buttonBox, _ := gtk.BoxNew(gtk.ORIENTATION_HORIZONTAL, 0)
 	buttonSwitch, _ := gtk.ButtonNew()
 	buttonSwitch.SetLabel("Start")
-	grid.Attach(buttonSwitch, 1, 2, 2, 1)
+	buttonBox.PackStart(buttonSwitch, true, true, 0)
+	box.PackStart(buttonBox, false, false, 5)
 
 	statusLabel, _ := gtk.LabelNew("")
-	grid.Attach(statusLabel, 0, 3, 1, 4)
+	box.PackStart(statusLabel, false, true, 10)
 
+	var on = false
+	var server *http.Server
 	buttonSwitch.Connect("clicked", func() {
 		port, _ := portInput.GetText()
 		dir, _ := dirInput.GetText()
-		go serve(port, dir)
-		statusText := fmt.Sprintf("Serving directory '%s' on port '%s'", dir, port)
-		statusLabel.SetText(statusText)
+
+		if on {
+			server.Shutdown(context.TODO())
+		} else {
+			go func() {
+				killServerDone := &sync.WaitGroup{}
+				server = serve(port, dir, killServerDone)
+				killServerDone.Add(1)
+				on = true
+				buttonSwitch.SetLabel("Stop")
+				killServerDone.Wait()
+				on = false
+				buttonSwitch.SetLabel("Start")
+			}()
+		}
 	})
 
-    win.Add(grid)
-    win.ShowAll()
+	win.Add(box)
+	win.ShowAll()
 }
-- 
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