fix(openai): keep transport failures structured instead of flattening them - #122
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… them
`send_checked` built a fully-populated `ProviderError` for a transport
failure — provider, model, and a computed `retryable` — and then threw the
struct away, returning a flattened `TinyAgentsError::Model(String)`. The
non-2xx branch twelve lines below kept its structure.
Hosts classify on the variant. So every transport failure reached the
OpenHuman backend model's logger through its generic arm and was recorded as
`managed invoke failed (non-provider error): ...` — no status, no provider, no
retryability — which is exactly the diagnostic gap reported against the
managed path. A connection reset and a rejected request were indistinguishable
in the log.
The crate's own contract already says this branch is wrong:
`TinyAgentsError::Provider` is documented as what adapters raise whenever they
have a `ProviderError` in hand, and this one is constructed on the line above.
- The `map_err` closure returns `TinyAgentsError::from_provider_error(...)`.
- `provider_failure_message` loses its only caller and is deleted; the crate
denies warnings, so leaving it would fail on `dead_code`. `Display for
ProviderError` already emits the identical format string.
- The provider README is corrected — it documented the flattening as
intentional.
Nothing user-facing changes. Both error variants render as
`model error: {0}`, and `Display for ProviderError` reproduces
`provider_failure_message` field for field, so the rendered text is
byte-identical. Retry behaviour is unchanged: `provider_error` already
computes `retryable` with the same classifier `is_retryable` applies to the
`Model` string today — the flag simply becomes a stored fact instead of being
re-derived from English prose at each call site.
This does make `TinyAgentsError::Provider` reachable with `status: None` for
the first time on this path. Every current consumer tolerates it —
`maybe_publish_session_expired` gates on `Some(401 | 403)` and
`from_provider_error` gates on `code`, which is `None` here — but anything
added later that assumes `Provider` implies a status will now see `None`.
Refs tinyhumansai/openhuman#5604
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Important Approval pendingCodeRabbit has no unresolved comments, but it could not review the latest commit because the review limit was reached. Follow the review guidance in this comment to continue. 📝 WalkthroughWalkthroughOpenAI transport failures now return structured ChangesOpenAI provider error handling
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to The change preserves structured transport errors without altering rendered messages or retry behavior. A README statement still overstates that these failures never reach a server, which could mislead maintainers about redirect-related failures; this is a bounded documentation issue and does not block merging if corrected or acknowledged. Suggested reviewers: Poem
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Inline comments:
In `@src/harness/providers/openai/README.md`:
- Around line 227-232: Update the transport-failure description in the README to
cover only send/connection failures handled by send_checked; remove body-read
failures from the TinyAgentsError::Provider claim, while retaining the existing
provider, model, retryable, and status details for send failures.
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src/harness/providers/openai/README.mdsrc/harness/providers/openai/test.rssrc/harness/providers/openai/transport.rs
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The previous wording said transport-level failures including body reads are raised as `TinyAgentsError::Provider`. Only send failures are: `list_models` and `invoke_responses` still map a failed body read to `TinyAgentsError::Model`, and this change does not touch them. Naming the remaining `Model` paths explicitly is better than a sentence that is true of one call site and wrong about two.
How this change flows1 changed behaviour across 5 relationships. 5 surrounding behaviours are shown (60 graph nodes walked). 43 further behaviours left out to keep the diagram readable. flowchart LR
n0["OpenAiModel<br/>changed"]:::changed
n1["new"]:::impacted
n2["...time_presets_normalize_endpoint_and_model"]:::impacted
n3["model"]:::impacted
n4["translates_request_to_openai_json_shape"]:::impacted
n5["stream"]:::impacted
n2 -->|uses| n0
n3 -->|uses| n0
n4 -->|calls| n3
n4 -->|tests| n3
n5 -->|calls| n1
classDef changed fill:#0d4429,stroke:#238636,color:#e6edf3
classDef impacted fill:#161b22,stroke:#6e7681,color:#c9d1d9
classDef flagged fill:#5a1e02,stroke:#d93f0b,color:#ffffff
classDef blocking fill:#67060c,stroke:#f85149,color:#ffffff
Green: changed behaviour. Grey: surrounding behaviour. Arrows name the call, use, implementation, or test relationship. Orange: has findings. Red: has a finding that blocks the merge. |
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Inline comments:
In `@src/harness/providers/openai/README.md`:
- Around line 227-230: Update the send failure description in the send_checked
documentation to say that no final HTTP status was available, rather than
asserting the request never reached a server; preserve the existing provider,
model, retryable, and status: None behavior.
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Saying the request "never reached a server" is wrong for one real case: the client keeps reqwest's default redirect policy — `OpenAiModel::new` sets only a connect timeout and never calls `.redirect()` — so a redirect loop or an exceeded redirect limit fails `send` after servers have answered with 3xx. `status: None` is still the right mapping; the reason is that no *final* status was available, which is what the text now says.
3 participants
Summary
send_checkedbuilt a fully-populatedProviderErrorfor a transport failure — provider, model, and a computedretryable— and then threw the struct away, returning a flattenedTinyAgentsError::Model(String). The non-2xx branch twelve lines below keeps its structure.Hosts classify on the variant, so this had a visible cost. Every transport failure reached the OpenHuman backend model's logger through its generic arm and was recorded as
managed invoke failed (non-provider error): ...— no status, no provider, no retryability. A connection reset and a rejected request were indistinguishable in the log. That is the diagnostic gap reported intinyhumansai/openhuman#5604; the reporter was reading a bug, not a property of the network.The crate's own contract already says this branch is wrong:
TinyAgentsError::Provideris documented as what adapters raise "whenever they have aProviderErrorin hand", andsend_checkedconstructs one on the line above.API Or Behavior Changes
Nothing user-facing changes, deliberately. Both variants carry
#[error("model error: {0}")], andDisplay for ProviderErrorreproducesprovider_failure_messagefield for field and in the same order — so the rendered string is byte-identical before and after. The test asserts this, which is what pins the claim.Retry behaviour is unchanged.
provider_erroralready computesretryablewith the sameclassify_provider_failurethatis_retryableapplies to theModelstring today. The flag becomes a stored fact instead of being re-derived from English prose at each call site.What does change, and is the point: the error variant.
TinyAgentsError::Provideris now reachable withstatus: Nonefor the first time on this path. I checked every consumer and all tolerate it —maybe_publish_session_expiredgates onmatches!(pe.status, Some(401 | 403)), andfrom_provider_errorgates oncode, which isNonehere — but anything added later that assumesProviderimplies a status will now seeNone. Worth knowing before writing such a match.provider_failure_messageloses its only caller and is deleted; the crate denies warnings, so leaving it would fail ondead_code.Tests
One new test,
a_transport_failure_is_reported_as_a_structured_provider_error, in the openai provider suite. It binds an ephemeral port, reads it, drops the listener, and points acompatible_provider("OpenHuman", …)model at the now-closed port — so the connect fails without waiting on a timeout. It asserts the variant,provider,model,status.is_none(),retryable, and that the rendered text is unchanged.Revert check — done. Restoring the pre-fix flattening (keeping the test) fails it, and the observed failure reproduces the exact string from the issue report:
That
Model(...)payload is verbatim what the reporter saw in the log. With the fix it is aProvidererror carrying the same text plus the fields.Commands run locally, all exit 0:
cargo fmt --checkcargo clippy --all-targets -- -D warningscargo clippy --all-targets --all-features -- -D warningscargo build --all-targetscargo build --all-targets --all-featurescargo test— 1778 lib tests, 0 failedcargo test --all-features— same, plus the integration and doc suitesThe
harness::retrysuite (36 tests) passes unchanged, which is the one that would notice if retryability had shifted.Documentation
src/harness/providers/openai/README.mddocumented the flattening as intentional ("have no such structure to preserve and surface as a plainTinyAgentsError::Modelstring viaprovider_failure_message"). Corrected in the same commit — leaving it would have left the repo arguing for the behaviour this removes.Related issue
tinyhumansai/openhuman#5604. Cross-repo, so no closing keyword: that issue must be closed by hand, and only after its infrastructure half is settled, which this does not touch. This is a diagnostic fix — it does not make a failing request succeed and says nothing about whether staging was actually down. Two of the three fix directions in that issue need no work: retry for transport failures already exists (RetryPolicy { max_attempts: 3, … }applied at the harness model call, and a bare transport error already classifies as retryable), and the "staging API goes offline" theory is argued against by the error class itself — a Cloudflare-fronted origin restart would have produced a52xstatus, which this path reports through the non-2xx branch.A submodule bump in openhuman follows once this merges; it cannot be raised before.
Summary by CodeRabbit
Bug Fixes
Tests