python can await a rust future

main
Jordan Orelli 1 month ago
commit 1666a38ad8

2
.gitignore vendored

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/target
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582
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venv_root := justfile_directory() / ".venv"
requirements := justfile_directory() / "requirements.txt"
venv_bins := venv_root / "bin"
python := venv_bins / "python"
pip := venv_bins / "pip"
[private]
default:
@ just --list
# remove all the built stuff and caches and all that
clean:
#!/usr/bin/env bash
set -euo pipefail
rm -rf {{ venv_root }}
rm -rf .mypy_cache
rm -rf .ruff_cache
rm -rf __pycache__
# creates a python virtualenv if one does not exist
venv:
#!/usr/bin/env bash
set -euo pipefail
if [ ! -d {{ venv_root }} ] ; then
echo Creating Python virtualenv
python3 -m venv {{ venv_root }}
# ensure pip is up to date
{{ pip }} install -U pip
fi
# installs all our build dependencies
deps: venv
#!/usr/bin/env bash
set -euo pipefail
{{ pip }} install -r {{ requirements }}
# convenience method to forward to the pip in our virtualenv
pip +a="": venv
#!/usr/bin/env bash
set -euo pipefail
{{ pip }} {{ a }}
show-packages: venv
@ {{ python }} -m pip freeze

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maturin ~= 1.7

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use anyhow;
use clap::Parser;
use pyo3::{prelude::*, types::PyBool};
use std::{rc::Rc, sync::Mutex, thread};
use tokio::sync::{mpsc, oneshot};
#[derive(Parser, Debug)]
struct Args {}
mod scripts {
use pyo3::prelude::*;
pub struct Embedded<'script> {
source: &'script str,
file_name: &'script str,
module_name: &'script str,
}
impl Embedded<'_> {
pub fn load<'py>(&self, py: Python<'py>) -> Result<Bound<'py, PyModule>, PyErr> {
PyModule::from_code_bound(py, self.source, self.file_name, self.module_name)
}
pub fn install(&self) -> Result<Py<PyModule>, PyErr> {
Python::with_gil(|py| {
let module =
PyModule::from_code_bound(py, self.source, self.file_name, self.module_name)?;
Ok(module.unbind())
})
}
}
#[allow(non_upper_case_globals)]
pub const main: Embedded = Embedded {
source: include_str!("python/main.py"),
file_name: "main.py",
module_name: "main",
};
}
#[derive(Clone)]
#[pyclass]
struct OpaqueHandle {
handle: tokio::runtime::Handle,
}
/// setup_extension creates a Python module consisting of members that are defined
/// in the farore host process (in Rust).
fn setup_extension(bridge: Bridge) -> Result<Py<PyModule>, PyErr> {
Python::with_gil(|py| {
let bound = py.get_type_bound::<Bridge>();
let module = PyModule::from_code_bound(py, "", "farore.py", "farore")?;
module.add(
"farore",
Core {
handle: bridge.handle.clone(),
},
)?;
Ok(module.unbind())
})
}
#[pyclass]
struct Bridge {
handle: tokio::runtime::Handle,
numbers: mpsc::Receiver<usize>,
}
#[pymethods]
impl Bridge {
fn receive(&mut self, fut: Bound<PyAny>) -> Result<(), PyErr> {
println!("Rust: Bridge receive value: {}", fut);
let fut = fut.unbind();
self.handle.spawn(async move {
println!("Rust: receive task going to sleep");
tokio::time::sleep(std::time::Duration::from_millis(100)).await;
println!("Rust: receive task finished sleep");
match Python::with_gil(|py| -> Result<(), PyErr> {
let main_module = py.import_bound("main")?;
println!("Rust: receive task has gil");
let fut = fut.bind(py);
fut.setattr("_asyncio_future_blocking", true);
fut.getattr("set_result")?.call1((5,))?;
println!("Rust: receive task set the result of a future");
Ok(())
}) {
Ok(()) => {}
Err(e) => println!("Rust: saw python error: {}", e),
}
});
Ok(())
}
}
/// Creates an asyncio Future and schedules a task in asyncio to wait on that
/// Future.
fn create_asyncio_future() -> Result<(Py<PyAny>, Py<PyAny>), PyErr> {
Python::with_gil(|py| {
let main = py.import_bound("main")?;
let run = main.getattr("create_later_slot")?;
let later = run.call0()?.unbind();
let dupe = Py::clone_ref(&later, py);
Ok((later, dupe))
})
}
#[pyclass]
struct Core {
handle: tokio::runtime::Handle,
}
#[pymethods]
impl Core {
fn next_message(&self) -> Result<Py<PyAny>, PyErr> {
let (here, there) = create_asyncio_future()?;
self.handle.spawn(async move {
println!("Going to sleep from the resolve function I guess");
tokio::time::sleep(std::time::Duration::from_millis(500)).await;
println!("Finished sleeping in the resolve function");
let py_result = Python::with_gil(|py| -> Result<(), PyErr> {
println!("We've got the gil in the resolve function");
let later = here.bind(py);
let set_result = later.getattr("set_result")?;
set_result.call1((17,))?;
Ok(())
});
match py_result {
Ok(()) => {}
Err(e) => {
println!("Failed to complete future: {}", e);
}
}
});
Ok(there)
}
}
async fn tokio_main(tx: mpsc::Sender<usize>) {
println!("Rust: Inside the tokio runtime");
tokio::time::sleep(std::time::Duration::from_secs(100)).await;
println!("Rust: Tokio runtime is done?");
}
fn start_tokio(tx_bridge: oneshot::Sender<Bridge>) -> Result<(), anyhow::Error> {
thread::spawn(move || {
// Start the runtime
let runtime = tokio::runtime::Runtime::new().unwrap();
// Create a bridge between the runtimes
let (tx, rx) = mpsc::channel(16);
let bridge = Bridge {
handle: runtime.handle().clone(),
numbers: rx,
};
let _ = tx_bridge
.send(bridge)
.inspect_err(|_| println!("Rust: failed to send bridge"));
runtime.block_on(tokio_main(tx));
});
Ok(())
}
fn run_python(bridge: Bridge) -> Result<Py<PyAny>, PyErr> {
setup_extension(bridge)?;
Python::with_gil(|py| {
let main = scripts::main.load(py)?;
let run = main.getattr("run")?;
let returned = run.call0()?;
Ok(returned.unbind())
})
}
fn main() -> Result<(), anyhow::Error> {
let (tx, rx) = oneshot::channel();
start_tokio(tx)?;
let bridge = rx.blocking_recv()?;
let v = run_python(bridge)?;
println!("Rust: Python interpreter completed with result: {}", v);
Ok(())
}

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from collections.abc import Awaitable
from typing import Any
class Bridge:
def receive(self, fut): ...
bridge: Bridge
class OpaqueHandle: ...
tokio_handle: OpaqueHandle
def next_message(h: OpaqueHandle): ...
class Core:
async def next_message(self) -> Awaitable[Any]: ...
farore: Core

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import asyncio
from farore import farore
import logging
logging.basicConfig(level=logging.DEBUG)
log = logging.getLogger("import")
log.debug(f"Python: farore module: {farore}")
async def wait_on(fut: asyncio.Future):
return await fut
class Later:
def __init__(self):
loop = asyncio.get_event_loop()
self.fut = loop.create_future()
self.task = loop.create_task(wait_on(self.fut))
def set_result(self, v):
def f():
self.fut.set_result(v)
loop = self.fut._loop
loop.call_soon_threadsafe(f)
def __await__(self):
return self.task.__await__()
def create_later_slot() -> Later:
return Later()
async def main_task():
log = logging.getLogger("main_task")
while True:
log.debug("Getting next message ...")
m = await farore.next_message()
log.debug(f"next message: {m}")
def run():
asyncio.run(main_task())
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