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synapse/build_rust.py

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# A build script for poetry that adds the rust extension.
import itertools
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import os
from typing import Any, Dict
from packaging.specifiers import SpecifierSet
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from setuptools_rust import Binding, RustExtension
def build(setup_kwargs: Dict[str, Any]) -> None:
original_project_dir = os.path.dirname(os.path.realpath(__file__))
cargo_toml_path = os.path.join(original_project_dir, "rust", "Cargo.toml")
extension = RustExtension(
target="synapse.synapse_rust",
path=cargo_toml_path,
binding=Binding.PyO3,
# This flag is a no-op in the latest versions. Instead, we need to
# specify this in the `bdist_wheel` config below.
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py_limited_api=True,
# We force always building in release mode, as we can't tell the
# difference between using `poetry` in development vs production.
debug=False,
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)
setup_kwargs.setdefault("rust_extensions", []).append(extension)
setup_kwargs["zip_safe"] = False
# We lookup the minimum supported python version by looking at
# `python_requires` (e.g. ">=3.9.0,<4.0.0") and finding the first python
# version that matches. We then convert that into the `py_limited_api` form,
# e.g. cp39 for python 3.9.
py_limited_api: str
python_bounds = SpecifierSet(setup_kwargs["python_requires"])
for minor_version in itertools.count(start=8):
if f"3.{minor_version}.0" in python_bounds:
py_limited_api = f"cp3{minor_version}"
break
setup_kwargs.setdefault("options", {}).setdefault("bdist_wheel", {})[
"py_limited_api"
] = py_limited_api