python: add a setuptools-rust test

mainly tests that our Python works with PyO3

Author: lazka

gha-matrix-gen/action.yml

@@ -34,6 +34,7 @@ runs:
               f"{ entry['prefix'] }-rust",
               f"{ entry['prefix'] }-python",
               f"{ entry['prefix'] }-python-setuptools",
+              f"{ entry['prefix'] }-python-setuptools-rust",
               f"{ entry['prefix'] }-cython",
               f"{ entry['prefix'] }-autotools",
               f"{ entry['prefix'] }-go",
@@ -78,6 +79,7 @@ runs:
               'gcc',
               'python',
               'python-setuptools',
+              'python-setuptools-rust',
               'cython',
               'autotools',
               'ruby',

python/setuptools-rust/.gitignore

@@ -0,0 +1,5 @@
+target/
+setuptools_rust_test/__pycache__/
+setuptools_rust_test/*.dll
+setuptools_rust_test/*.pyd
+build/

python/setuptools-rust/Cargo.lock

@@ -0,0 +1,11 @@
+[package]
+name = "setuptools_rust_test"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+name = "_lib"
+crate-type = ["cdylib"]
+
+[dependencies]
+pyo3 = { version = "0.27.2" }

python/setuptools-rust/Cargo.toml

@@ -0,0 +1,12 @@
+#!/usr/bin/env python
+
+from setuptools import setup
+from setuptools_rust import Binding, RustExtension
+
+setup(
+    name="setuptools_rust_test",
+    version="0.1.0",
+    rust_extensions=[RustExtension("setuptools_rust_test._lib", binding=Binding.PyO3)],
+    packages=["setuptools_rust_test"],
+    zip_safe=False,
+)

python/setuptools-rust/setup.py

@@ -0,0 +1,4 @@
+from ._lib import hello
+
+if __name__ == "__main__":
+    print(hello())

python/setuptools-rust/setuptools_rust_test/__main__.py

@@ -0,0 +1,12 @@
+use pyo3::prelude::*;
+
+#[pyfunction]
+fn hello() -> PyResult<String> {
+    Ok("Hello from Rust!".to_string())
+}
+
+#[pymodule]
+fn _lib(m: &Bound<'_, PyModule>) -> PyResult<()> {
+    m.add_function(wrap_pyfunction!(hello, m)?)?;
+    Ok(())
+}

python/setuptools-rust/src/lib.rs

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+set -e
+
+# should be fixed in the next pyo3 version (0.28)
+link_arg=$(python -c "import sysconfig; print(sysconfig.get_config_var('LIBPYTHON'))")
+export RUSTFLAGS="-C link-arg=$link_arg"
+
+./setup.py build_rust --inplace
+python -m setuptools_rust_test

python/setuptools-rust/test.sh

@@ -6,6 +6,7 @@ python --version
 
 (cd setuptools-cext && ./test.sh)
 (cd setuptools-cython && ./test.sh)
+(cd setuptools-rust && ./test.sh)
 
 if [[ "$MSYSTEM" == "MSYS" ]]; then
     # Make sure python does not give away that we are not cygwin