code refactoring, enabled memory db persist to fs.

.gitignore

@@ -15,3 +15,4 @@ downloads
 .DS_Store
 build/
 yt-dlp-webui
+session.dat

frontend/src/App.tsx

@@ -32,7 +32,7 @@ import { RootState, store } from './stores/store'
 import AppBar from './components/AppBar'
 import Drawer from './components/Drawer'
 
-import Downloaded from './Downloaded'
+import Archive from './Archive'
 import { formatGiB } from './utils'
 
 function AppContent() {
@@ -148,7 +148,7 @@ function AppContent() {
                   <ListItemIcon>
                     <DownloadIcon />
                   </ListItemIcon>
-                  <ListItemText primary="Downloaded" />
+                  <ListItemText primary="Archive" />
                 </ListItemButton>
               </Link>
               <Link to={'/settings'} style={
@@ -188,7 +188,7 @@ function AppContent() {
               } />
               <Route path="/archive" element={
                 <Suspense fallback={<CircularProgress />}>
-                  <Downloaded />
+                  <Archive />
                 </Suspense>
               } />
             </Routes>

frontend/src/Archive.tsx

@@ -130,7 +130,11 @@ export default function Downloaded() {
           icon={<DeleteForeverIcon />}
           tooltipTitle={`Delete selected`}
           tooltipOpen
-          onClick={() => setOpenDialog(true)}
+          onClick={() => {
+            if (selected$.value.length > 0) {
+              setOpenDialog(true)
+            }
+          }}
         />
       </SpeedDial>
       <Dialog

frontend/src/components/DownloadsCardView.tsx

@@ -6,7 +6,7 @@ import { StackableResult } from "./StackableResult"
 
 type Props = {
   downloads: RPCResult[]
-  abortFunction: Function
+  abortFunction: (id: string) => void
 }
 
 export function DownloadsCardView({ downloads, abortFunction }: Props) {

frontend/src/components/StackableResult.tsx

@@ -1,4 +1,4 @@
-import { EightK, FourK, Hd, Sd } from "@mui/icons-material";
+import { EightK, FourK, Hd, Sd } from '@mui/icons-material'
 import {
   Button,
   Card,
@@ -11,9 +11,9 @@ import {
   Skeleton,
   Stack,
   Typography
-} from "@mui/material";
-import { useEffect, useState } from "react";
-import { ellipsis, formatSpeedMiB, roundMiB } from "../utils";
+} from '@mui/material'
+import { useEffect, useState } from 'react'
+import { ellipsis, formatSpeedMiB, roundMiB } from '../utils'
 
 type Props = {
   title: string,
@@ -97,7 +97,8 @@ export function StackableResult({
           variant="contained"
           size="small"
           color="primary"
-          onClick={stopCallback}>
+          onClick={stopCallback}
+        >
           {isCompleted ? "Clear" : "Stop"}
         </Button>
       </CardActions>

server/memory_db.go

@@ -108,4 +108,14 @@ func (m *MemoryDB) Restore() {
 	feed, _ := os.ReadFile("session.dat")
 	session := Session{}
 	json.Unmarshal(feed, &session)
+
+	for _, proc := range session.Processes {
+		db.table.Store(proc.Id, &Process{
+			id:       proc.Id,
+			url:      proc.Info.URL,
+			Info:     proc.Info,
+			Progress: proc.Progress,
+			mem:      m,
+		})
+	}
 }

server/process.go

@@ -171,14 +171,17 @@ func (p *Process) Kill() error {
 	// has been spawned with setPgid = true. To properly kill
 	// all subprocesses a SIGTERM need to be sent to the correct
 	// process group
-	pgid, err := syscall.Getpgid(p.proc.Pid)
-	if err != nil {
+	if p.proc != nil {
+		pgid, err := syscall.Getpgid(p.proc.Pid)
+		if err != nil {
+			return err
+		}
+		err = syscall.Kill(-pgid, syscall.SIGTERM)
+
+		log.Println("Killed process", p.id)
 		return err
 	}
-	err = syscall.Kill(-pgid, syscall.SIGTERM)
-
-	log.Println("Killed process", p.id)
-	return err
+	return nil
 }
 
 // Returns the available format for this URL

server/rest/handlers.go

@@ -21,6 +21,13 @@ type DirectoryEntry struct {
 	SHASum string `json:"shaSum"`
 }
 
+func isValidEntry(d fs.DirEntry) bool {
+	return !d.IsDir() &&
+		!strings.HasPrefix(d.Name(), ".") &&
+		!strings.HasSuffix(d.Name(), ".part") &&
+		!strings.HasSuffix(d.Name(), ".ytdl")
+}
+
 func walkDir(root string) (*[]DirectoryEntry, error) {
 	files := []DirectoryEntry{}
 
@@ -28,7 +35,7 @@ func walkDir(root string) (*[]DirectoryEntry, error) {
 		if err != nil {
 			return err
 		}
-		if !d.IsDir() && !strings.HasPrefix(d.Name(), ".") {
+		if isValidEntry(d) {
 			h := sha256.New()
 			h.Write([]byte(path))
 

server/server.go

@@ -1,12 +1,17 @@
 package server
 
 import (
+	"context"
 	"fmt"
 	"io"
 	"io/fs"
 	"log"
 	"net/http"
 	"net/rpc"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
 
 	"github.com/gofiber/fiber/v2"
 	"github.com/gofiber/fiber/v2/middleware/cors"
@@ -18,6 +23,8 @@ import (
 var db MemoryDB
 
 func RunBlocking(port int, frontend fs.FS) {
+	db.Restore()
+
 	service := new(Service)
 	rpc.Register(service)
 
@@ -73,5 +80,34 @@ func RunBlocking(port int, frontend fs.FS) {
 
 	app.Server().StreamRequestBody = true
 
+	go periodicallyPersist()
+	go gracefulShutdown(app)
+
 	log.Fatal(app.Listen(fmt.Sprintf(":%d", port)))
 }
+
+func gracefulShutdown(app *fiber.App) {
+	ctx, stop := signal.NotifyContext(context.Background(),
+		os.Interrupt,
+		syscall.SIGTERM,
+		syscall.SIGQUIT,
+	)
+
+	go func() {
+		<-ctx.Done()
+		log.Println("shutdown signal received")
+
+		defer func() {
+			db.Persist()
+			stop()
+			app.ShutdownWithTimeout(time.Second * 5)
+		}()
+	}()
+}
+
+func periodicallyPersist() {
+	for {
+		db.Persist()
+		time.Sleep(time.Minute * 5)
+	}
+}

server/service.go

@@ -72,12 +72,15 @@ func (t *Service) Running(args NoArgs, running *Running) error {
 func (t *Service) Kill(args string, killed *string) error {
 	log.Println("Trying killing process with id", args)
 	proc, err := db.Get(args)
+
 	if err != nil {
 		return err
 	}
 	if proc != nil {
 		err = proc.Kill()
 	}
+
+	db.Delete(proc.id)
 	return err
 }