added progress bar and scheduler

backend/src/executor.js

@@ -1,5 +1,5 @@
 import { spawn } from 'node:child_process';
-import { PassThrough } from 'node:stream';
+import { PassThrough, Transform } from 'node:stream';
 import { resticProcessEnv } from './config.js';
 
 export class CommandError extends Error {
@@ -74,7 +74,22 @@ export function runRestic(args, options = {}) {
   });
 }
 
-export function streamResticDumpToDd(snapshotId, filename, outputPath, log) {
+export function createProgressStream(totalBytes, onProgress) {
+  let currentBytes = 0;
+  return new Transform({
+    transform(chunk, _encoding, callback) {
+      currentBytes += chunk.length;
+      onProgress?.({
+        currentBytes,
+        totalBytes,
+        percent: totalBytes ? (currentBytes / totalBytes) * 100 : 0,
+      });
+      callback(null, chunk);
+    },
+  });
+}
+
+export function streamResticDumpToDd(snapshotId, filename, outputPath, log, progress = null) {
   return new Promise((resolve, reject) => {
     const restic = spawn('restic', ['dump', snapshotId, filename], {
       env: resticProcessEnv(),
@@ -91,7 +106,11 @@ export function streamResticDumpToDd(snapshotId, filename, outputPath, log) {
     let resticClosed = false;
     let ddClosed = false;
     const pipe = new PassThrough();
-    restic.stdout.pipe(pipe).pipe(dd.stdin);
+    let restoreStream = restic.stdout.pipe(pipe);
+    if (progress) {
+      restoreStream = restoreStream.pipe(createProgressStream(progress.totalBytes, progress.onProgress));
+    }
+    restoreStream.pipe(dd.stdin);
 
     restic.stderr.on('data', (chunk) => log?.(chunk.toString().trimEnd()));
     dd.stderr.on('data', (chunk) => log?.(chunk.toString().trimEnd()));