Initial open-source self-hosted Songs2YT edition

lib/fs-utils.ts

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+import { createWriteStream } from "fs";
+import fs from "fs/promises";
+import { Readable } from "stream";
+import { pipeline } from "stream/promises";
+
+export async function writeUploadedFile(file: File, destPath: string) {
+  const webStream = file.stream();
+  const nodeStream = Readable.fromWeb(webStream as Parameters<typeof Readable.fromWeb>[0]);
+  await pipeline(nodeStream, createWriteStream(destPath));
+}
+
+export async function moveFile(src: string, dest: string) {
+  try {
+    await fs.rename(src, dest);
+  } catch (err) {
+    const code = err && typeof err === "object" && "code" in err ? err.code : null;
+    if (code === "EXDEV") {
+      await fs.copyFile(src, dest);
+      await fs.unlink(src).catch(() => {});
+      return;
+    }
+    throw err;
+  }
+}
+
+export async function mapWithConcurrency<T, R>(
+  items: T[],
+  concurrency: number,
+  fn: (item: T, index: number) => Promise<R>,
+) {
+  const results: R[] = new Array(items.length);
+  let nextIndex = 0;
+
+  async function worker() {
+    while (nextIndex < items.length) {
+      const index = nextIndex;
+      nextIndex += 1;
+      results[index] = await fn(items[index], index);
+    }
+  }
+
+  const workers = Array.from({ length: Math.min(concurrency, items.length) }, () => worker());
+  await Promise.all(workers);
+  return results;
+}