From d8793f77858bd70453e7d34a9ad6dd5e603e0ec2 Mon Sep 17 00:00:00 2001 From: 9qeklajc Date: Sat, 26 Sep 2026 15:51:52 +0200 Subject: [PATCH] perf: use orjson in streaming hot path and cache provider url --- docs/latency-patterns.md | 81 +++++++++++++++++++++++++++++++++ pyproject.toml | 1 + routstr/upstream/base.py | 21 +++------ routstr/upstream/json_codec.py | 29 ++++++++++++ routstr/upstream/model_paths.py | 3 ++ uv.lock | 65 ++++++++++++++++++++++++++ 6 files changed, 185 insertions(+), 15 deletions(-) create mode 100644 docs/latency-patterns.md create mode 100644 routstr/upstream/json_codec.py diff --git a/docs/latency-patterns.md b/docs/latency-patterns.md new file mode 100644 index 00000000..e8798bed --- /dev/null +++ b/docs/latency-patterns.md @@ -0,0 +1,81 @@ +# Streaming latency patterns + +Patterns taken from LiteLLM 1.93 (`litellm/proxy/pass_through_endpoints/`, +`litellm/proxy/common_request_processing.py`, `litellm/litellm_core_utils/logging_worker.py`) +and how they map onto Routstr's streaming hot path in `routstr/upstream/base.py`. + +## Where time goes today + +Every SSE event in `handle_streaming_chat_completion` and +`handle_streaming_responses_completion` is parsed, mutated (`model`, `id`, +`provider`, `provider_url`), observed for usage, and reserialized. Cost scales with +chunks per second times concurrent streams, all on one event-loop thread. + +## 1. Fast JSON in the per-chunk path — done + +LiteLLM parses request bodies with `orjson` (`common_utils/http_parsing_utils.py`). + +Routstr: `routstr/upstream/json_codec.py` wraps `orjson` with a stdlib fallback +(orjson rejects `NaN` on load and non-string keys / >64-bit ints on dump). Used for +the per-event parse and reserialize in both streaming paths. + +Wire change: emitted events are compact UTF-8 JSON (`{"a":1}`, raw `é`) instead of +stdlib's `{"a": 1}` with `\u00e9`. Both are valid JSON. + +Measured on a typical chat chunk: 2.85µs → 0.54µs per parse+serialize (5.3x). + +## 2. Resolve per-stream invariants once — done (partial) + +LiteLLM computes `fast_path`, `cost_injection_active` and `debug_enabled` once per +stream, then runs a branch-free loop (`common_request_processing.py:2632`). + +Routstr: `_apply_provider_field` (and the OpenRouter/generic overrides) ran +`public_provider_url(self.base_url)` — a `urlsplit` plus `ipaddress` parse — on every +chunk. It is now `lru_cache`d in `routstr/upstream/model_paths.py`, which keeps +subclass semantics. 1.67µs → 0.03µs per chunk. + +Combined per-chunk saving from 1 and 2: 4.52µs → 0.57µs. + +## 3. Linear buffer handling — next + +`buffer = (buffer + chunk).replace(b"\r\n", b"\n")` re-copies and rescans the whole +unconsumed buffer on every network chunk, and `b"\n\n" in buffer` rescans it again. +This is quadratic in event size — it bites on large single events such as +Responses API `response.completed`, which carries the full output. Normalize only the +new chunk (holding back a trailing `\r`) and search for the delimiter from the +previous end offset. + +## 4. Raw passthrough, parse usage at end — next + +LiteLLM's pass-through hot path forwards `aiter_bytes()` chunks untouched and appends +them to `raw_bytes`; usage is reconstructed once after the stream +(`streaming_handler.py:chunk_processor`, `_convert_raw_bytes_to_str_lines`). + +Routstr parses every event to rewrite `model`/`id` and feed +`MissingUsageEstimator.observe`. Candidates to skip parsing: events whose `model` +already equals `requested_model` and whose `id` is stable, with usage observed from a +cheap byte check (`b'"usage"'`) or at end of stream. LiteLLM makes byte-level mutation +safe by returning the original chunk on any failure +(`_process_chunk_with_cost_injection`). Needs a framing test suite before starting. + +## 5. Settlement off the response path — next + +LiteLLM enqueues end-of-stream work on a bounded `asyncio.Queue` with a semaphore +and per-task timeout (`logging_worker.py`, "+200 RPS"). + +Routstr runs `adjust_payment_for_tokens` inline after the last upstream chunk, so the +client waits on a DB session and writes before the stream closes. The reservation is +already persisted, so settlement can move to a worker and the stale-reservation sweep +stays the backstop. Unlike LiteLLM's logging queue, this queue must never drop work, +and the cost trailer the client receives must be computed before the stream closes or +be dropped from the contract. + +## Related, outside the streaming loop + +- `keys.db` runs WAL with default `synchronous=FULL`, so every reservation commit + fsyncs before the upstream request is sent. `synchronous=NORMAL` removes that and + cannot corrupt the database. +- `fastapi run` serves one worker. Multiple workers are blocked: the lifespan starts + payout, auto top-up and refund tasks per process, and there is no leader election. +- There is no inbound admission control. A concurrency gate that returns 429 with + `Retry-After` before `pay_for_request` would shed load before it reaches the DB. diff --git a/pyproject.toml b/pyproject.toml index 9f0eabd1..c723ae37 100644 --- a/pyproject.toml +++ b/pyproject.toml @@ -22,6 +22,7 @@ dependencies = [ "pillow>=10", "openai>=1.98.0", "litellm>=1.93.0,<1.94", # 1.93 is the first line supporting Python 3.14 + "orjson>=3.10", ] [dependency-groups] diff --git a/routstr/upstream/base.py b/routstr/upstream/base.py index e829939b..28e72c9b 100644 --- a/routstr/upstream/base.py +++ b/routstr/upstream/base.py @@ -63,7 +63,7 @@ from ..wallet import ( send_token, token_mint_url, ) -from . import messages_dispatch +from . import json_codec, messages_dispatch from .cache_breakpoints import ( inject_anthropic_cache_breakpoints, is_explicit_cache_model, @@ -1277,10 +1277,7 @@ class BaseUpstreamProvider: done_seen = True return - try: - obj = json.loads(data) - except Exception: - obj = None + obj = json_codec.loads(data) if isinstance(obj, dict): usage_estimator.observe(obj) @@ -1322,15 +1319,12 @@ class BaseUpstreamProvider: # usage is reported exactly once (in the trailer). forward = {k: v for k, v in obj.items() if k != "usage"} yield ( - prefix - + b"data: " - + json.dumps(forward).encode() - + b"\n\n" + prefix + b"data: " + json_codec.dumps(forward) + b"\n\n" ) return usage_chunk_data = obj return - yield prefix + b"data: " + json.dumps(obj).encode() + b"\n\n" + yield prefix + b"data: " + json_codec.dumps(obj) + b"\n\n" else: if final: # Final flush of a truncated tail: the upstream closed @@ -1760,10 +1754,7 @@ class BaseUpstreamProvider: done_seen = True return - try: - obj = json.loads(data) - except json.JSONDecodeError: - obj = None + obj = json_codec.loads(data) if isinstance(obj, dict): self._apply_provider_field(obj) @@ -1789,7 +1780,7 @@ class BaseUpstreamProvider: return usage_estimator.observe(obj) - yield prefix + b"data: " + json.dumps(obj).encode() + b"\n\n" + yield prefix + b"data: " + json_codec.dumps(obj) + b"\n\n" else: if final: # Final flush of a truncated tail: upstream closed diff --git a/routstr/upstream/json_codec.py b/routstr/upstream/json_codec.py new file mode 100644 index 00000000..81570a71 --- /dev/null +++ b/routstr/upstream/json_codec.py @@ -0,0 +1,29 @@ +"""Fast JSON for per-chunk streaming paths, with stdlib fallback. + +orjson rejects a few inputs the stdlib accepts (``NaN``/``Infinity`` on load, +non-string keys and integers beyond 64 bits on dump). Streaming must never break +on those, so each call falls back to :mod:`json` instead of raising. +""" + +import json + +import orjson + + +def loads(data: bytes | str) -> object | None: + """Parse JSON, returning ``None`` when the payload is not valid JSON.""" + try: + return orjson.loads(data) + except orjson.JSONDecodeError: + try: + return json.loads(data) + except ValueError: + return None + + +def dumps(obj: object) -> bytes: + """Serialize to compact UTF-8 JSON bytes.""" + try: + return orjson.dumps(obj) + except TypeError: + return json.dumps(obj).encode() diff --git a/routstr/upstream/model_paths.py b/routstr/upstream/model_paths.py index fedb042e..a53ec0f0 100644 --- a/routstr/upstream/model_paths.py +++ b/routstr/upstream/model_paths.py @@ -17,6 +17,7 @@ provider they named. from __future__ import annotations import asyncio +import functools import ipaddress import json import random @@ -101,6 +102,8 @@ class ProviderPathSnapshot: preserve_model_ids: frozenset[str] = 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