open-webui/backend/open_webui/utils
Classic298 d198d950c6
perf: stop re-copying the response text on every stream save (#28821)
Every streamed delta saves a snapshot of the in-progress response so a reconnecting client can resume it, and each save rebuilt the assistant text from scratch. On the Chat Completions path that re-joined every accumulated chunk, including on saves carrying no new text, so a long answer followed by a large tool call re-joined the whole answer once per argument chunk. The Responses API path never collects those chunks and reads the text back out of the output items instead, where the blank check copied it in full every time.

The joined string is now kept and reused until another chunk arrives, since content_parts is only ever appended to; the nonlocal declaration that suggested otherwise was already dead and is dropped, and inlining the single-use helper removes an unreachable branch with it. The blank check in get_output_text now tests the text rather than allocating a stripped copy of it, which is equivalent for all twelve of its callers. Text streaming on the Chat Completions path is unchanged, since a text delta always appends before it saves.

| stream | before | after |
| --- | --- | --- |
| 20k-char answer, 2000 tool-argument chunks | 21.4 ms | 0.06 ms |
| Responses API, 40k deltas, 200k chars | 80.7 ms | 50.5 ms |

Without Redis nothing extra is retained, since the snapshot store already held that string; with Redis one copy of the response text stays alive while the stream runs.
2026-08-25 15:41:54 -04:00
..
access_control fix: keep folder parent references acyclic (#28748) 2026-08-24 17:06:19 -04:00
images perf: build debug log messages lazily so disabled debug logs cost nothing (#27834) 2026-07-31 19:09:01 -05:00
mcp refac 2026-06-29 11:56:00 -05:00
telemetry refac(telemetry): drop deprecated semconv SpanAttributes subclass (#25784) 2026-06-29 02:05:34 -05:00
actions.py fix: enforce action availability and model access on the chat action route (#27243) 2026-07-23 12:23:05 -04:00
anthropic.py fix: use the pooled client timeout for the Anthropic Messages passthrough (#27675) 2026-08-24 07:33:33 -04:00
asgi_middleware.py refac 2026-08-24 18:29:36 -04:00
ask_user.py refac 2026-08-13 21:02:17 -06:00
audit.py perf: build debug log messages lazily so disabled debug logs cost nothing (#27834) 2026-07-31 19:09:01 -05:00
auth.py fix: revoke existing sessions when a password changes (#28725) 2026-08-17 13:56:29 -07:00
automations.py refac 2026-08-13 16:42:10 -06:00
calendar.py refac 2026-07-31 17:30:47 -04:00
channels.py refac 2026-03-17 17:58:01 -05:00
chat.py perf: build info log messages lazily so raising the log level actually saves work (#27837) 2026-08-02 15:39:10 -05:00
chat_fork.py refac 2026-07-23 02:54:56 -04:00
chat_id.py refac 2026-07-26 21:12:14 -04:00
chat_variables.py refac 2026-07-31 17:41:14 -04:00
code_interpreter.py refac 2026-07-31 17:41:14 -04:00
context_compaction.py refac 2026-08-23 13:36:53 -04:00
embeddings.py refac: modernize type annotations (PEP 604 / PEP 585) 2026-05-12 17:10:15 +09:00
files.py refac 2026-07-23 21:29:33 -04:00
filter.py refac 2026-08-25 15:00:53 -04:00
groups.py refac: modernize type annotations (PEP 604 / PEP 585) 2026-05-12 17:10:15 +09:00
headers.py refac 2026-08-24 18:38:29 -04:00
json_codec.py perf: write task payloads to Redis as bytes (#28833) 2026-08-20 12:58:52 -07:00
json_response.py perf: optional orjson JSON codec behind ENABLE_ORJSON (#27583) 2026-07-27 03:45:37 -04:00
logger.py perf: stop formatting every exported log record twice under OTEL log export (#27840) 2026-08-10 23:13:52 -06:00
memory.py refac 2026-08-10 19:28:21 -06:00
middleware.py perf: stop re-copying the response text on every stream save (#28821) 2026-08-25 15:41:54 -04:00
misc.py perf: stop re-copying the response text on every stream save (#28821) 2026-08-25 15:41:54 -04:00
model_ids.py refac 2026-07-26 23:09:22 -04:00
models.py refac 2026-08-13 00:07:31 -06:00
notifications.py refac 2026-07-27 19:39:36 -04:00
oauth.py refac 2026-08-24 17:47:10 -04:00
payload.py refac 2026-08-16 22:56:19 -07:00
pdf_generator.py refac: modernize type annotations (PEP 604 / PEP 585) 2026-05-12 17:10:15 +09:00
plugin.py perf: build info log messages lazily so raising the log level actually saves work (#27837) 2026-08-02 15:39:10 -05:00
rate_limit.py refac: modernize type annotations (PEP 604 / PEP 585) 2026-05-12 17:10:15 +09:00
redis.py fix: Set default Redis socket timeout to None (#27104) 2026-07-27 00:30:00 -04:00
response.py refac 2026-08-17 00:57:57 -07:00
sanitize.py refac 2026-03-17 17:58:01 -05:00
security_headers.py refac 2026-08-24 18:29:36 -04:00
session_pool.py fix: long streamed lines no longer abort the response (#28114) 2026-08-25 12:16:37 -04:00
subagents.py refac 2026-08-10 20:13:03 -06:00
task.py refac 2026-06-19 00:16:06 +02:00
terminals.py refac 2026-08-19 22:48:32 -07:00
timers.py fix: index the chat queries that make large SQLite instances unusable (#27663) 2026-08-23 16:11:54 -05:00
tool_approval.py refac 2026-08-16 22:52:24 -07:00
tools.py refac 2026-08-24 18:38:29 -04:00
validate.py refac 2026-07-27 19:39:36 -04:00
valves.py refac 2026-07-31 17:41:14 -04:00
webhook.py perf: build debug log messages lazily so disabled debug logs cost nothing (#27834) 2026-07-31 19:09:01 -05:00