open-webui/backend/open_webui
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perf: make streamed content accumulation genuinely linear (#27359)
The streaming handler's content accumulator is a closure cell (declared nonlocal in stream_body_handler), and CPython's in-place string append optimization only applies to plain local variables (STORE_FAST), never to cell variables (STORE_DEREF). The content += value form introduced in #27231 therefore still allocates and copies the full accumulated string on every delta, exactly like the f-string it replaced; whether that copy is cheap or expensive is up to the allocator, and measurements swing accordingly (6 to 83 ms of pure copying for a 400 KB response on Python 3.12, against 0.3 ms for this patch).

Accumulate the deltas in a list instead and join once at the single read site (publish_chat_finished_event at stream end). List append is amortized O(1) with no dependence on reference counts, bytecode specialization or allocator behaviour, so accumulation is O(n) by construction. The non-str fallback keeps the previous f-string coercion semantics.

Verified end to end against a mock SSE upstream: a streamed chat with a think-tag block plus 40 content deltas produces output items, message text, reasoning text and usage identical to current dev, with no errors in the server log.
2026-07-23 18:17:41 -05:00
..
data refac: mv backend files to /open_webui dir 2024-09-04 16:54:48 +02:00
internal perf: cut per-request database session overhead (#27385) 2026-07-23 17:49:48 -05:00
migrations chore: format 2026-07-23 13:41:16 -04:00
models refac 2026-07-23 19:17:19 -04:00
retrieval Forward user info headers to Mistral OCR API (#27253) 2026-07-23 12:33:19 -05:00
routers refac 2026-07-23 19:17:19 -04:00
socket refac 2026-07-23 19:12:47 -04:00
static refac 2026-07-20 22:27:13 -04:00
storage refac: modernize type annotations (PEP 604 / PEP 585) 2026-05-12 17:10:15 +09:00
tools refac 2026-07-23 03:39:30 -04:00
utils perf: make streamed content accumulation genuinely linear (#27359) 2026-07-23 18:17:41 -05:00
__init__.py refac 2026-06-17 03:01:11 +02:00
alembic.ini fix: Alembic CLI commands from failing 2025-08-15 04:17:47 -04:00
config.py refac 2026-07-14 17:34:00 -04:00
constants.py refac 2026-06-29 05:46:51 -05:00
env.py refac 2026-07-09 17:28:05 -05:00
events.py Log upstream provider rejections at warn/error level (#27238) 2026-07-23 03:42:48 -04:00
functions.py refac 2026-07-23 03:39:56 -04:00
main.py fix: capture uncompressed response bodies in audit logs (#27369) 2026-07-23 18:09:40 -05:00
tasks.py refac 2026-07-16 21:57:43 -04:00