## 📋 Pull Request Information **Original PR:** https://github.com/open-webui/open-webui/pull/24379 **Author:** [@jmleksan](https://github.com/jmleksan) **Created:** 5/5/2026 **Status:** 🔄 Open **Base:** `dev` ← **Head:** `fix/transcibe-blocking-files-upload` --- ### 📝 Commits (1) - [`e78fae5`](https://github.com/open-webui/open-webui/commit/e78fae544a0683cab92cc6f26e218ca98c5ef52c) Refactor file processing to use asyncio for transcribing, improving concurrency. ### 📊 Changes **1 file changed** (+7 additions, -1 deletions) <details> <summary>View changed files</summary> 📝 `backend/open_webui/routers/files.py` (+7 -1) </details> ### 📄 Description  # Pull Request Checklist ### Note to first-time contributors: Please open a discussion post in [Discussions](https://github.com/open-webui/open-webui/discussions) to discuss your idea/fix with the community before creating a pull request, and describe your changes before submitting a pull request. **Before submitting, make sure you've checked the following:** - [x] **Target branch:** Verify that the pull request targets the `dev` branch. **PRs targeting `main` will be immediately closed.** - [x] **Description:** Provide a concise description of the changes made in this pull request down below. - [x] **Changelog:** Ensure a changelog entry following the format of [Keep a Changelog](https://keepachangelog.com/) is added at the bottom of the PR description. - [x] **Documentation:** Add docs in [Open WebUI Docs Repository](https://github.com/open-webui/docs). Document user-facing behavior, environment variables, public APIs/interfaces, or deployment steps. - [x] **Dependencies:** Are there any new or upgraded dependencies? If so, explain why, update the changelog/docs, and include any compatibility notes. Actually run the code/function that uses updated library to ensure it doesn't crash. - No dependency changes in this PR. - [x] **Testing:** Perform manual tests to **verify the implemented fix/feature works as intended AND does not break any other functionality**. Include reproducible steps to demonstrate the issue before the fix. Test edge cases (URL encoding, HTML entities, types). Take this as an opportunity to **make screenshots of the feature/fix and include them in the PR description**. - [x] **Agentic AI Code:** Confirm this Pull Request is **not written by any AI Agent** or has at least **gone through additional human review AND manual testing**. If any AI Agent is the co-author of this PR, it may lead to immediate closure of the PR. - [x] **Code review:** Have you performed a self-review of your code, addressing any coding standard issues and ensuring adherence to the project's coding standards? - [x] **Design & Architecture:** Prefer smart defaults over adding new settings; use local state for ephemeral UI logic. Open a Discussion for major architectural or UX changes. - [x] **Git Hygiene:** Keep PRs atomic (one logical change). Clean up commits and rebase on `dev` to ensure no unrelated commits (e.g. from `main`) are included. Push updates to the existing PR branch instead of closing and reopening. - [x] **Title Prefix:** To clearly categorize this pull request, prefix the pull request title using one of the following: - Selected prefix: **fix** # Changelog Entry ### Description - Offloads synchronous STT transcription in the file-ingest processing path to a worker thread to avoid blocking the event loop during audio file processing. - This aligns `files` router behavior with async concurrency expectations and reduces request latency/jitter under concurrent load. ### Changed - In `backend/open_webui/routers/files.py`, `process_uploaded_file()` now calls: - `await asyncio.to_thread(transcribe, request, file_path_processed, file_metadata, user)` instead of calling `transcribe(...)` directly in async flow. ### Fixed - Fixed event-loop blocking risk in STT processing for uploaded audio files in the `files` router path. --- ### Additional Information - Scope is intentionally minimal and atomic: only wraps existing transcription call with `asyncio.to_thread`. - No behavior or API contract changes intended; only execution context changed (main loop -> thread worker). - Related area: async responsiveness/concurrency for audio transcription endpoints. Builds off of https://github.com/open-webui/open-webui/pull/24338 ### Contributor License Agreement  - [x] By submitting this pull request, I confirm that I have read and fully agree to the [Contributor License Agreement (CLA)](https://github.com/open-webui/open-webui/blob/main/CONTRIBUTOR_LICENSE_AGREEMENT), and I am providing my contributions under its terms. > [!NOTE] > Deleting the CLA section will lead to immediate closure of your PR and it will not be merged in. --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>

GiteaMirror commented

2026-05-06 12:52:23 -05:00

Owner

📋 Pull Request Information

Original PR: https://github.com/open-webui/open-webui/pull/24379
Author: @jmleksan
Created: 5/5/2026
Status: 🔄 Open

Base: dev ← Head: fix/transcibe-blocking-files-upload

📝 Commits (1)

e78fae5 Refactor file processing to use asyncio for transcribing, improving concurrency.

📊 Changes

1 file changed (+7 additions, -1 deletions)

View changed files

📝 backend/open_webui/routers/files.py (+7 -1)

📄 Description

Pull Request Checklist

Note to first-time contributors: Please open a discussion post in Discussions to discuss your idea/fix with the community before creating a pull request, and describe your changes before submitting a pull request.

Before submitting, make sure you've checked the following:

Target branch: Verify that the pull request targets the dev branch. PRs targeting main will be immediately closed.
Description: Provide a concise description of the changes made in this pull request down below.
Changelog: Ensure a changelog entry following the format of Keep a Changelog is added at the bottom of the PR description.
Documentation: Add docs in Open WebUI Docs Repository. Document user-facing behavior, environment variables, public APIs/interfaces, or deployment steps.
Dependencies: Are there any new or upgraded dependencies? If so, explain why, update the changelog/docs, and include any compatibility notes. Actually run the code/function that uses updated library to ensure it doesn't crash.
- No dependency changes in this PR.
Testing: Perform manual tests to verify the implemented fix/feature works as intended AND does not break any other functionality. Include reproducible steps to demonstrate the issue before the fix. Test edge cases (URL encoding, HTML entities, types). Take this as an opportunity to make screenshots of the feature/fix and include them in the PR description.
Agentic AI Code: Confirm this Pull Request is not written by any AI Agent or has at least gone through additional human review AND manual testing. If any AI Agent is the co-author of this PR, it may lead to immediate closure of the PR.
Code review: Have you performed a self-review of your code, addressing any coding standard issues and ensuring adherence to the project's coding standards?
Design & Architecture: Prefer smart defaults over adding new settings; use local state for ephemeral UI logic. Open a Discussion for major architectural or UX changes.
Git Hygiene: Keep PRs atomic (one logical change). Clean up commits and rebase on dev to ensure no unrelated commits (e.g. from main) are included. Push updates to the existing PR branch instead of closing and reopening.
Title Prefix: To clearly categorize this pull request, prefix the pull request title using one of the following:
- Selected prefix: fix

Changelog Entry

Description

Offloads synchronous STT transcription in the file-ingest processing path to a worker thread to avoid blocking the event loop during audio file processing.
This aligns files router behavior with async concurrency expectations and reduces request latency/jitter under concurrent load.

Changed

In backend/open_webui/routers/files.py, process_uploaded_file() now calls:
- await asyncio.to_thread(transcribe, request, file_path_processed, file_metadata, user)
  instead of calling transcribe(...) directly in async flow.

Fixed

Fixed event-loop blocking risk in STT processing for uploaded audio files in the files router path.

Additional Information

Scope is intentionally minimal and atomic: only wraps existing transcription call with asyncio.to_thread.
No behavior or API contract changes intended; only execution context changed (main loop -> thread worker).
Related area: async responsiveness/concurrency for audio transcription endpoints. Builds off of https://github.com/open-webui/open-webui/pull/24338

Contributor License Agreement

By submitting this pull request, I confirm that I have read and fully agree to the Contributor License Agreement (CLA), and I am providing my contributions under its terms.

Note

Deleting the CLA section will lead to immediate closure of your PR and it will not be merged in.

_{🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.}

GiteaMirror added the pull-request label 2026-05-06 12:52:23 -05:00

[PR #24379] fix: offload STT transcription in file processing path #66483