From 7b1aa749eb0590a387ab51a12ff126868f7216a0 Mon Sep 17 00:00:00 2001
From: G30 <50341825+silentoplayz@users.noreply.github.com>
Date: Mon, 29 Jun 2026 04:46:24 -0400
Subject: [PATCH] perf(retrieval): make URL fetch and file hash non-blocking
 with asyncio.to_thread (#25822)

- Wrap get_content_from_url() in asyncio.to_thread() inside
  get_sources_from_items() to prevent sync requests.get() from blocking
  the event loop when users attach URL sources to chat messages.
  The same function was already properly wrapped at retrieval.py:1839.

- Wrap hashlib.sha256(contents).hexdigest() in asyncio.to_thread()
  inside upload_file_handler() to prevent CPU-bound hashing from
  blocking the event loop during file uploads (44ms/100MB, scales
  linearly with file size).
---
 backend/open_webui/routers/files.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/backend/open_webui/routers/files.py b/backend/open_webui/routers/files.py
index 26114a8276..ba0a878f86 100644
--- a/backend/open_webui/routers/files.py
+++ b/backend/open_webui/routers/files.py
@@ -341,7 +341,9 @@ async def upload_file_handler(
 
         # SHA-256 of raw uploaded bytes for incremental sync diffing.
         # If the client pre-computed and sent file_hash, use that.
-        file_hash = file_metadata.get('file_hash') or hashlib.sha256(contents).hexdigest()
+        file_hash = file_metadata.get('file_hash') or await asyncio.to_thread(
+            lambda: hashlib.sha256(contents).hexdigest()
+        )
 
         file_item = await Files.insert_new_file(
             user.id,