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* feat(proxy/hooks): add ProxyHTTPRateLimitError + provider resolver
Introduces a small helper layer used by every proxy-side rate-limit
hook so that the 429 they raise carries a populated llm_provider /
model — instead of an empty exception.llm_provider that downstream
loggers (Prometheus failure metric, observability callbacks) read as
'no provider attribution'.
ProxyHTTPRateLimitError inherits from both fastapi.HTTPException
(so the proxy server still renders it as a 429) and
litellm.exceptions.RateLimitError (so isinstance checks and
PrometheusLogger._get_exception_class_name pick up llm_provider).
We deliberately don't call RateLimitError.__init__ — it constructs
an httpx.Response we don't need and would just add failure surface;
attribute parity is what downstream consumers care about.
resolve_llm_provider_for_rate_limit() wraps litellm.get_llm_provider
defensively. Internal limiter hooks fire from async_pre_call_hook —
well before get_llm_provider runs anywhere else in the request
lifecycle — so we have to call it ourselves at raise time. If the
model is missing or unparseable (alias, router-only model) we fall
back to llm_provider='litellm_proxy' rather than letting a second
exception leak out and break the request path.
Co-authored-by: Mateo Wang <mateo-berri@users.noreply.github.com>
* fix(proxy/hooks): populate llm_provider on parallel-request 429s
Both v1 and v3 parallel-request limiters fired bare HTTPException(429)
from inside async_pre_call_hook. The downstream Prometheus failure
metric reads exception.llm_provider via _get_exception_class_name —
the empty value showed up as exception_class='HTTPException' and
left model_id='None' on the time series.
Threads requested_model through every raise site in:
* parallel_request_limiter.py:
- check_key_in_limits (the per-key/per-model/per-user/per-team/
per-customer over-limit path)
- raise_rate_limit_error (zero-limit + global_max_parallel_requests
paths) — now takes an optional requested_model kwarg
* parallel_request_limiter_v3.py:
- _handle_rate_limit_error (the OVER_LIMIT translator), called
from both the should_rate_limit pre-check and the TPM
reservation path
Resolved via resolve_llm_provider_for_rate_limit so unknown / missing
models silently fall back to llm_provider='litellm_proxy' instead of
breaking the request path with a second exception.
Co-authored-by: Mateo Wang <mateo-berri@users.noreply.github.com>
* fix(proxy/hooks): populate llm_provider on dynamic-rate-limit 429s
Same plumbing change as the parallel limiters, applied to both
dynamic_rate_limiter (v1) and dynamic_rate_limiter_v3:
* v1: TPM-zero and RPM-zero paths in async_pre_call_hook now resolve
data['model'] -> (model, llm_provider) once and pass it into both
raises.
* v3: All three raise sites in _check_rate_limits — the
model_saturation_check enforced raise, the priority_model
enforced raise, and the fail-closed unknown-descriptor branch —
now attribute the 429 to the actual provider.
Falls back to llm_provider='litellm_proxy' when the model can't be
resolved.
Co-authored-by: Mateo Wang <mateo-berri@users.noreply.github.com>
* fix(proxy/hooks): populate llm_provider on batch-rate-limit 429s
batch_rate_limiter._raise_rate_limit_error now takes a
requested_model kwarg threaded from data['model'] in
_check_and_increment_batch_counters. The batch-creation 429 is what
gets raised when the input file's tokens/requests count would push
the per-key TPM/RPM window over its limit.
Co-authored-by: Mateo Wang <mateo-berri@users.noreply.github.com>
* fix(proxy/hooks): populate llm_provider on budget/iterations 429s
Final batch of internal raise sites — the user/session-budget and
max-iterations hooks. Same pattern: resolve data['model'] once at
raise time, attach to ProxyHTTPRateLimitError so Prometheus and
observability callbacks can attribute the 429.
Hooks updated:
* max_budget_limiter (per-user max_budget exceeded)
* max_iterations_limiter (per-session agent iteration cap)
* max_budget_per_session_limiter (per-session dollar cap)
All three fall back to llm_provider='litellm_proxy' when data['model']
is missing or unparseable. Drops the now-unused HTTPException import
from each module.
Co-authored-by: Mateo Wang <mateo-berri@users.noreply.github.com>
* test(proxy/hooks): pin provider field on internal rate-limit 429s
Regression coverage for the 'provider field missing' bug across every
proxy-side rate-limit hook + the helper layer:
* ProxyHTTPRateLimitError class shape (HTTPException + RateLimitError,
dict-detail stringification, None-provider normalization).
* resolve_llm_provider_for_rate_limit happy paths
(gpt-4o-mini, anthropic/..., bedrock/...) plus all three fallback
branches (None, '', unknown name) plus a 'get_llm_provider raises'
case that asserts we swallow the secondary exception.
* For each limiter (parallel v1/v3, dynamic v1/v3, batch,
max_budget, max_iterations, max_budget_per_session): assert the
raised exception is a RateLimitError carrying the resolved
model + llm_provider, and a sibling test that asserts the
fallback path returns 'litellm_proxy' without leaking a second
exception.
* Two PrometheusLogger._get_exception_class_name pins so the
Prometheus failure metric label flips from 'HTTPException' to
'Openai.ProxyHTTPRateLimitError' (or 'Litellm_proxy.*' on
fallback) — that's what dashboards consume.
Co-authored-by: Mateo Wang <mateo-berri@users.noreply.github.com>
* perf(proxy/hooks): defer provider resolution to over-limit branches
* fix: use error_message in raise_rate_limit_error to avoid literal 'None' in detail
* Consolidate rate_limiter_utils imports in dynamic_rate_limiter
* fix(proxy): set num_retries/max_retries on ProxyHTTPRateLimitError
ProxyHTTPRateLimitError inherits from RateLimitError but did not call
RateLimitError.__init__, so num_retries/max_retries were never set.
When Starlette's HTTPException lacks __str__, MRO falls through to
RateLimitError.__str__, which unconditionally reads these attributes
and raises AttributeError during logging/traceback formatting.
Initialize them to None defensively.
* fix(mypy): silence base-class status_code conflict on ProxyHTTPRateLimitError
HTTPException declares 'status_code: int' while openai.RateLimitError
(via APIStatusError) declares 'status_code: Literal[429] = 429'. Mypy
flags the multi-base override as [misc] in CI lint. The runtime semantics
are fine (we set self.status_code in __init__), so silence the
class-level annotation conflict with a targeted ignore.
Co-authored-by: Mateo Wang <mateo-berri@users.noreply.github.com>
---------
Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Mateo Wang <mateo-berri@users.noreply.github.com>
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|---|---|---|
| .. | ||
| test_async_post_call_streaming_iterator_hook.py | ||
| test_batch_file_validation.py | ||
| test_dynamic_rate_limiter_v3.py | ||
| test_image_generation_guardrails.py | ||
| test_key_management_event_hooks.py | ||
| test_max_budget_limiter.py | ||
| test_max_budget_per_session_limiter.py | ||
| test_max_iterations_limiter.py | ||
| test_parallel_request_limiter_v3.py | ||
| test_post_call_failure_hook_integration.py | ||
| test_post_call_response_headers_hook.py | ||
| test_post_call_streaming_hook_integration.py | ||
| test_post_call_success_hook_integration.py | ||
| test_prompt_injection_detection.py | ||
| test_proxy_hooks_init.py | ||
| test_proxy_rate_limit_provider_field.py | ||
| test_proxy_track_cost_callback.py | ||
| test_rate_limiter_toctou.py | ||
| test_send_invite_email.py | ||
| test_sensitive_data_routing.py | ||
| test_tpm_concurrent.py | ||