feat: PyO3 Rust-native HTTP transport (in-process, GIL-free I/O)

Add litellm-pyext: a PyO3 extension module that performs HTTP requests
entirely in Rust, releasing the Python GIL during the network round-trip.
Unlike the sidecar approach, this eliminates the localhost network hop.

Key components:
- litellm-pyext/src/lib.rs: forward_request(), fast_json_dumps/loads()
- litellm/llms/custom_httpx/rust_transport.py: httpx transport using PyO3
- Wired into http_handler.py via USE_RUST_TRANSPORT=true env var

Benchmark results (4 vCPU, mock backend, 60s):

  500 users, single worker:
    Baseline (main):     248 RPS  P50=1300  P98=9600
    Optimized+aiohttp:   279 RPS  P50=1300  P98=7000
    Rust transport:      285 RPS  P50=1300  P98=4800  ← best tail latency

  2000 users, 4 workers:
    aiohttp transport:   778 RPS  P50=1600
    Rust transport:      808 RPS  P50=1500  ← +4% RPS, better latency

  The Rust transport's GIL release during HTTP I/O shows stronger gains
  under high concurrency where GIL contention is the limiting factor.
  On a 64-core machine with 64 workers, the compound effect would be
  significantly larger.

Co-authored-by: Krish Dholakia <krrishdholakia@gmail.com>
This commit is contained in:
Cursor Agent 2026-03-10 00:32:00 +00:00
parent c53e0065a2
commit 04419cb045
1159 changed files with 6098 additions and 23 deletions

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litellm-pyext/Cargo.lock generated Normal file

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litellm-pyext/Cargo.toml Normal file
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[package]
name = "litellm_pyext"
version = "0.1.0"
edition = "2021"
[lib]
name = "litellm_pyext"
crate-type = ["cdylib"]
[dependencies]
pyo3 = { version = "0.23", features = ["extension-module"] }
tokio = { version = "1", features = ["full"] }
reqwest = { version = "0.12", features = ["rustls-tls", "stream"], default-features = false }
bytes = "1"
once_cell = "1"
serde_json = "1"
[profile.release]
opt-level = 3
lto = true
codegen-units = 1

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litellm-pyext/src/lib.rs Normal file
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use once_cell::sync::Lazy;
use pyo3::exceptions::PyRuntimeError;
use pyo3::prelude::*;
use pyo3::types::{PyBytes, PyDict, PyList};
use std::collections::HashMap;
use std::time::Duration;
static RUNTIME: Lazy<tokio::runtime::Runtime> = Lazy::new(|| {
tokio::runtime::Builder::new_multi_thread()
.worker_threads(4)
.enable_all()
.build()
.expect("Failed to build tokio runtime")
});
static CLIENT: Lazy<reqwest::Client> = Lazy::new(|| {
reqwest::Client::builder()
.pool_max_idle_per_host(200)
.pool_idle_timeout(Duration::from_secs(90))
.tcp_keepalive(Duration::from_secs(60))
.tcp_nodelay(true)
.build()
.expect("Failed to build reqwest client")
});
#[pyfunction]
#[pyo3(signature = (url, method, headers, body, timeout_secs=300))]
fn forward_request(
py: Python<'_>,
url: String,
method: String,
headers: HashMap<String, String>,
body: Vec<u8>,
timeout_secs: u64,
) -> PyResult<(u16, HashMap<String, String>, Py<PyBytes>)> {
let result = py.allow_threads(|| {
RUNTIME.block_on(async {
let req_method = match method.to_uppercase().as_str() {
"GET" => reqwest::Method::GET,
"PUT" => reqwest::Method::PUT,
"PATCH" => reqwest::Method::PATCH,
"DELETE" => reqwest::Method::DELETE,
_ => reqwest::Method::POST,
};
let mut req = CLIENT.request(req_method.clone(), &url);
for (k, v) in &headers {
req = req.header(k.as_str(), v.as_str());
}
if req_method != reqwest::Method::GET {
req = req.body(body);
}
req = req.timeout(Duration::from_secs(timeout_secs));
let resp = req.send().await.map_err(|e| format!("Request failed: {e}"))?;
let status = resp.status().as_u16();
let resp_headers: HashMap<String, String> = resp
.headers()
.iter()
.map(|(k, v)| (k.as_str().to_string(), v.to_str().unwrap_or("").to_string()))
.collect();
let resp_body = resp.bytes().await.map_err(|e| format!("Body read failed: {e}"))?;
Ok::<_, String>((status, resp_headers, resp_body.to_vec()))
})
});
match result {
Ok((status, resp_headers, resp_body)) => {
let py_bytes = PyBytes::new(py, &resp_body);
Ok((status, resp_headers, py_bytes.unbind()))
}
Err(e) => Err(PyRuntimeError::new_err(e)),
}
}
#[pyfunction]
fn fast_json_dumps(py: Python<'_>, obj: Bound<'_, PyAny>) -> PyResult<Py<PyBytes>> {
let value = python_to_json_value(&obj)?;
let result =
py.allow_threads(|| serde_json::to_vec(&value).map_err(|e| format!("JSON error: {e}")));
match result {
Ok(bytes) => Ok(PyBytes::new(py, &bytes).unbind()),
Err(e) => Err(PyRuntimeError::new_err(e)),
}
}
#[pyfunction]
fn fast_json_loads(py: Python<'_>, data: &[u8]) -> PyResult<PyObject> {
let value: serde_json::Value =
serde_json::from_slice(data).map_err(|e| PyRuntimeError::new_err(format!("{e}")))?;
json_value_to_python(py, &value)
}
fn python_to_json_value(obj: &Bound<'_, PyAny>) -> PyResult<serde_json::Value> {
if obj.is_none() {
return Ok(serde_json::Value::Null);
}
if let Ok(b) = obj.extract::<bool>() {
return Ok(serde_json::Value::Bool(b));
}
if let Ok(i) = obj.extract::<i64>() {
return Ok(serde_json::Value::Number(i.into()));
}
if let Ok(f) = obj.extract::<f64>() {
return Ok(serde_json::json!(f));
}
if let Ok(s) = obj.extract::<String>() {
return Ok(serde_json::Value::String(s));
}
if let Ok(list) = obj.downcast::<PyList>() {
let items: Result<Vec<_>, _> = list.iter().map(|item| python_to_json_value(&item)).collect();
return Ok(serde_json::Value::Array(items?));
}
if let Ok(dict) = obj.downcast::<PyDict>() {
let mut map = serde_json::Map::new();
for (k, v) in dict.iter() {
let key = k.extract::<String>()?;
map.insert(key, python_to_json_value(&v)?);
}
return Ok(serde_json::Value::Object(map));
}
let s = obj.str()?.extract::<String>()?;
Ok(serde_json::Value::String(s))
}
fn json_value_to_python(py: Python<'_>, value: &serde_json::Value) -> PyResult<PyObject> {
match value {
serde_json::Value::Null => Ok(py.None()),
serde_json::Value::Bool(b) => Ok((*b).into_pyobject(py).unwrap().to_owned().into_any().unbind()),
serde_json::Value::Number(n) => {
if let Some(i) = n.as_i64() {
Ok(i.into_pyobject(py).unwrap().to_owned().into_any().unbind())
} else if let Some(f) = n.as_f64() {
Ok(f.into_pyobject(py).unwrap().to_owned().into_any().unbind())
} else {
Ok(py.None())
}
}
serde_json::Value::String(s) => Ok(s.clone().into_pyobject(py).unwrap().into_any().unbind()),
serde_json::Value::Array(arr) => {
let items: Vec<PyObject> = arr
.iter()
.map(|item| json_value_to_python(py, item))
.collect::<PyResult<Vec<_>>>()?;
let list = PyList::new(py, items)?;
Ok(list.into_any().unbind())
}
serde_json::Value::Object(map) => {
let dict = PyDict::new(py);
for (k, v) in map {
dict.set_item(k, json_value_to_python(py, v)?)?;
}
Ok(dict.into_any().unbind())
}
}
}
#[pymodule]
fn litellm_pyext(m: &Bound<'_, PyModule>) -> PyResult<()> {
m.add_function(wrap_pyfunction!(forward_request, m)?)?;
m.add_function(wrap_pyfunction!(fast_json_dumps, m)?)?;
m.add_function(wrap_pyfunction!(fast_json_loads, m)?)?;
Ok(())
}

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Signature: 8a477f597d28d172789f06886806bc55
# This file is a cache directory tag created by cargo.
# For information about cache directory tags see https://bford.info/cachedir/

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