cleanup tmp files on failed download

exo/download/new_shard_download.py

@@ -92,20 +92,28 @@ async def fetch_file_list(repo_id, revision, path=""):
 
 @retry(stop=stop_after_attempt(5), wait=wait_exponential(multiplier=0.5))
 async def download_file(repo_id: str, revision: str, path: str, target_dir: Path, on_progress: Callable[[int, int], None] = lambda _, __: None) -> Path:
-  if (target_dir/path).exists(): return target_dir/path
-  await aios.makedirs((target_dir/path).parent, exist_ok=True)
-  base_url = f"{get_hf_endpoint()}/{repo_id}/resolve/{revision}/"
-  url = urljoin(base_url, path)
-  headers = await get_auth_headers()
-  async with aiohttp.ClientSession(timeout=aiohttp.ClientTimeout(total=1800, connect=60, sock_read=1800, sock_connect=60)) as session:
-    async with session.get(url, headers=headers, timeout=aiohttp.ClientTimeout(total=1800, connect=60, sock_read=1800, sock_connect=60)) as r:
-      assert r.status == 200, f"Failed to download {path} from {url}: {r.status}"
-      length = int(r.headers.get('content-length', 0))
-      n_read = 0
-      async with aiofiles.tempfile.NamedTemporaryFile(dir=target_dir, delete=False) as temp_file:
-        while chunk := await r.content.read(1024 * 1024): on_progress(n_read := n_read + await temp_file.write(chunk), length)
-        await aios.rename(temp_file.name, target_dir/path)
-      return target_dir/path
+  temp_file_name = None
+  try:
+    if (target_dir/path).exists(): return target_dir/path
+    await aios.makedirs((target_dir/path).parent, exist_ok=True)
+    base_url = f"{get_hf_endpoint()}/{repo_id}/resolve/{revision}/"
+    url = urljoin(base_url, path)
+    headers = await get_auth_headers()
+    async with aiohttp.ClientSession(timeout=aiohttp.ClientTimeout(total=1800, connect=60, sock_read=1800, sock_connect=60)) as session:
+      async with session.get(url, headers=headers, timeout=aiohttp.ClientTimeout(total=1800, connect=60, sock_read=1800, sock_connect=60)) as r:
+        assert r.status == 200, f"Failed to download {path} from {url}: {r.status}"
+        length = int(r.headers.get('content-length', 0))
+        n_read = 0
+        async with aiofiles.tempfile.NamedTemporaryFile(dir=target_dir, delete=False) as temp_file:
+          temp_file_name = temp_file.name
+          while chunk := await r.content.read(1024 * 1024): on_progress(n_read := n_read + await temp_file.write(chunk), length)
+          await aios.rename(temp_file.name, target_dir/path)
+        return target_dir/path
+  finally:
+    if temp_file_name: # attempt to delete tmp file if it still exists
+      try: await aios.unlink(temp_file_name)
+      except: pass
+
 
 def calculate_repo_progress(shard: Shard, repo_id: str, revision: str, file_progress: Dict[str, RepoFileProgressEvent], all_start_time: float) -> RepoProgressEvent:
   all_total_bytes = sum([p.total for p in file_progress.values()])
@@ -233,4 +241,3 @@ class NewShardDownloader(ShardDownloader):
     if DEBUG >= 6: print("Downloaded shards:", downloads)
     if any(isinstance(d, Exception) for d in downloads) and DEBUG >= 1: print("Error downloading shards:", [d for d in downloads if isinstance(d, Exception)])
     return [d for d in downloads if not isinstance(d, Exception)]
-