Patrick Buckley
5fb27e8f81
fix(session): survive mid-stream transport deaths in interactive turns ( #937 )
...
A wire death during body streaming (ReadError on a TLS record failure,
peer resets) surfaces after the request has already returned its stream
handle, so neither the SDK's request retries nor the creation-time
retry ladder ever saw it: the interactive turn died with a bare
exception string, the partial output was discarded, and no log trace
was left. Utility lanes already survived this through drain_stream's
normalization; the interactive loop now gets the same treatment.
- transport_guarded() in providers/_protocol.py: drain_stream's
transport-death conversion made reusable for consumers that keep
streaming semantics. Pre-finish deaths raise the retryable
IncompleteStreamError (drain's exact message shape); post-finish
blips end the stream cleanly, forfeiting only trailing metadata.
- The single-pass chunk consumer renames to _stream_attempt;
_stream_response is now the resilient wrapper owning ALL stream
acquisition plus a bounded mid-stream re-issue ladder
(_MID_STREAM_RETRIES, the shared _stop_retrying predicate with a
per-loop cap, cancel-aware exponential backoff). Send()'s overflow
compact-and-retry arm now wraps the whole turn and passes re-prepared
msgs explicitly.
- A dead attempt is finalized across every UI consumer before the
retry (stream_end then turn_committed then notice then spinner), so
retried text never appends onto the dead attempt's in any surface
(browser transcript, CLI markdown fences, Slack/Discord streamed
messages, SSE replay ring).
- Before re-creating, the session re-resolves its registry binding: a
concurrent ModelRegistry.reload() closes cached clients, and the
retry must not stream into the closed one. A failing re-create logs
stream.retry.recreate_failed and re-raises the ORIGINAL stream-death
error rather than masking it.
- _format_backend_error gains a stream-death branch naming the
provider, endpoint, and model, with a short identity-bearing first
sentence. _BACKEND_STREAM_EXC_NAMES joins _BACKEND_KNOWN_EXC_NAMES,
which also removes those names from _is_ctx_overflow's text-detection
eligibility (deliberate: their texts are fixed transport strings that
never carry overflow phrases).
- _record_fatal_error now logs session.fatal.recorded (INFO for
KeyboardInterrupt, ERROR otherwise) so fatal turns leave a journal
trace.
- _assistant_pending_tokens resets at stream entry so a post-finish
blip that loses the trailing usage chunk cannot append the previous
turn's completion count as this turn's estimate.
Offline SDK boundary pins (openai/anthropic mid-body death identity and
no re-request, cross-thread client close surfacing httpx.ReadError)
guard the assumptions the retry gate rests on.
2026-08-04 04:53:17 -07:00
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