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call_between_rust_and_python.rs
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97 lines (84 loc) · 2.58 KB
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use rustpython::vm::{
pyclass, pymodule, PyObject, PyPayload, PyResult, TryFromBorrowedObject, VirtualMachine,
};
pub fn main() {
let interp = rustpython::InterpreterConfig::new()
.init_stdlib()
.init_hook(Box::new(|vm| {
vm.add_native_module(
"rust_py_module".to_owned(),
Box::new(rust_py_module::make_module),
);
}))
.interpreter();
interp.enter(|vm| {
vm.insert_sys_path(vm.new_pyobj("examples"))
.expect("add path");
let module = vm.import("call_between_rust_and_python", None, 0).unwrap();
let init_fn = module.get_attr("python_callback", vm).unwrap();
vm.invoke(&init_fn, ()).unwrap();
let take_string_fn = module.get_attr("take_string", vm).unwrap();
vm.invoke(
&take_string_fn,
(String::from("Rust string sent to python"),),
)
.unwrap();
})
}
#[pymodule]
mod rust_py_module {
use super::*;
use rustpython::vm::{builtins::PyList, convert::ToPyObject, PyObjectRef};
#[pyfunction]
fn rust_function(
num: i32,
s: String,
python_person: PythonPerson,
_vm: &VirtualMachine,
) -> PyResult<RustStruct> {
println!(
"Calling standalone rust function from python passing args:
num: {},
string: {},
python_person.name: {}",
num, s, python_person.name
);
Ok(RustStruct {
numbers: NumVec(vec![1, 2, 3, 4]),
})
}
#[derive(Debug, Clone)]
struct NumVec(Vec<i32>);
impl ToPyObject for NumVec {
fn to_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
let list = self.0.into_iter().map(|e| vm.new_pyobj(e)).collect();
PyList::new_ref(list, vm.as_ref()).to_pyobject(vm)
}
}
#[pyattr]
#[pyclass(module = "rust_py_module", name = "RustStruct")]
#[derive(Debug, PyPayload)]
struct RustStruct {
numbers: NumVec,
}
#[pyclass]
impl RustStruct {
#[pygetset]
fn numbers(&self) -> NumVec {
self.numbers.clone()
}
#[pymethod]
fn print_in_rust_from_python(&self) {
println!("Calling a rust method from python");
}
}
struct PythonPerson {
name: String,
}
impl TryFromBorrowedObject for PythonPerson {
fn try_from_borrowed_object(vm: &VirtualMachine, obj: &PyObject) -> PyResult<Self> {
let name = obj.get_attr("name", vm)?.try_into_value::<String>(vm)?;
Ok(PythonPerson { name })
}
}
}