Set the module of #[pyfunction]s.

Previously neither the module nor the name of the module of
pyfunctions were registered. This commit passes the module and
its name when creating a new pyfunction.

PyModule::add_function and PyModule::add_module have been added and are
set to replace `add_wrapped` in a future release. `add_wrapped` is kept
for compatibility reasons during the transition.

Depending on whether a `PyModule` or `Python` is the argument for the
Python function-wrapper, the module will be registered with the function.

examples/rustapi_module/src/datetime.rs

@@ -215,29 +215,29 @@ impl TzClass {
 
 #[pymodule]
 fn datetime(_py: Python<'_>, m: &PyModule) -> PyResult<()> {
-    m.add_wrapped(wrap_pyfunction!(make_date))?;
-    m.add_wrapped(wrap_pyfunction!(get_date_tuple))?;
-    m.add_wrapped(wrap_pyfunction!(date_from_timestamp))?;
-    m.add_wrapped(wrap_pyfunction!(make_time))?;
-    m.add_wrapped(wrap_pyfunction!(get_time_tuple))?;
-    m.add_wrapped(wrap_pyfunction!(make_delta))?;
-    m.add_wrapped(wrap_pyfunction!(get_delta_tuple))?;
-    m.add_wrapped(wrap_pyfunction!(make_datetime))?;
-    m.add_wrapped(wrap_pyfunction!(get_datetime_tuple))?;
-    m.add_wrapped(wrap_pyfunction!(datetime_from_timestamp))?;
+    m.add_function(wrap_pyfunction!(make_date))?;
+    m.add_function(wrap_pyfunction!(get_date_tuple))?;
+    m.add_function(wrap_pyfunction!(date_from_timestamp))?;
+    m.add_function(wrap_pyfunction!(make_time))?;
+    m.add_function(wrap_pyfunction!(get_time_tuple))?;
+    m.add_function(wrap_pyfunction!(make_delta))?;
+    m.add_function(wrap_pyfunction!(get_delta_tuple))?;
+    m.add_function(wrap_pyfunction!(make_datetime))?;
+    m.add_function(wrap_pyfunction!(get_datetime_tuple))?;
+    m.add_function(wrap_pyfunction!(datetime_from_timestamp))?;
 
     // Python 3.6+ functions
     #[cfg(Py_3_6)]
     {
-        m.add_wrapped(wrap_pyfunction!(time_with_fold))?;
+        m.add_function(wrap_pyfunction!(time_with_fold))?;
         #[cfg(not(PyPy))]
         {
-            m.add_wrapped(wrap_pyfunction!(get_time_tuple_fold))?;
-            m.add_wrapped(wrap_pyfunction!(get_datetime_tuple_fold))?;
+            m.add_function(wrap_pyfunction!(get_time_tuple_fold))?;
+            m.add_function(wrap_pyfunction!(get_datetime_tuple_fold))?;
         }
     }
 
-    m.add_wrapped(wrap_pyfunction!(issue_219))?;
+    m.add_function(wrap_pyfunction!(issue_219))?;
     m.add_class::<TzClass>()?;
 
     Ok(())

examples/rustapi_module/src/othermod.rs

@@ -31,7 +31,7 @@ fn double(x: i32) -> i32 {
 
 #[pymodule]
 fn othermod(_py: Python<'_>, m: &PyModule) -> PyResult<()> {
-    m.add_wrapped(wrap_pyfunction!(double))?;
+    m.add_function(wrap_pyfunction!(double))?;
 
     m.add_class::<ModClass>()?;
 

examples/word-count/src/lib.rs

@@ -55,9 +55,9 @@ fn count_line(line: &str, needle: &str) -> usize {
 
 #[pymodule]
 fn word_count(_py: Python<'_>, m: &PyModule) -> PyResult<()> {
-    m.add_wrapped(wrap_pyfunction!(search))?;
-    m.add_wrapped(wrap_pyfunction!(search_sequential))?;
-    m.add_wrapped(wrap_pyfunction!(search_sequential_allow_threads))?;
+    m.add_function(wrap_pyfunction!(search))?;
+    m.add_function(wrap_pyfunction!(search_sequential))?;
+    m.add_function(wrap_pyfunction!(search_sequential_allow_threads))?;
 
     Ok(())
 }

guide/src/function.md

@@ -36,7 +36,7 @@ fn double(x: usize) -> usize {
 
 #[pymodule]
 fn module_with_functions(py: Python, m: &PyModule) -> PyResult<()> {
-    m.add_wrapped(wrap_pyfunction!(double)).unwrap();
+    m.add_function(wrap_pyfunction!(double)).unwrap();
 
     Ok(())
 }
@@ -65,7 +65,7 @@ fn num_kwds(kwds: Option<&PyDict>) -> usize {
 
 #[pymodule]
 fn module_with_functions(py: Python, m: &PyModule) -> PyResult<()> {
-    m.add_wrapped(wrap_pyfunction!(num_kwds)).unwrap();
+    m.add_function(wrap_pyfunction!(num_kwds)).unwrap();
     Ok(())
 }
 

guide/src/module.md

@@ -67,13 +67,13 @@ fn subfunction() -> String {
 
 #[pymodule]
 fn submodule(_py: Python, module: &PyModule) -> PyResult<()> {
-    module.add_wrapped(wrap_pyfunction!(subfunction))?;
+    module.add_function(wrap_pyfunction!(subfunction))?;
     Ok(())
 }
 
 #[pymodule]
 fn supermodule(_py: Python, module: &PyModule) -> PyResult<()> {
-    module.add_wrapped(wrap_pymodule!(submodule))?;
+    module.add_module(wrap_pymodule!(submodule))?;
     Ok(())
 }
 

pyo3-derive-backend/src/module.rs

@@ -45,7 +45,7 @@ pub fn process_functions_in_module(func: &mut syn::ItemFn) -> syn::Result<()> {
                 let item: syn::ItemFn = syn::parse_quote! {
                     fn block_wrapper() {
                         #function_to_python
-                        #module_name.add_wrapped(&#function_wrapper_ident)?;
+                        #module_name.add_function(&#function_wrapper_ident)?;
                     }
                 };
                 stmts.extend(item.block.stmts.into_iter());
@@ -193,7 +193,10 @@ pub fn add_fn_to_module(
     let wrapper = function_c_wrapper(&func.sig.ident, &spec);
 
     Ok(quote! {
-        fn #function_wrapper_ident(py: pyo3::Python) -> pyo3::PyObject {
+        fn #function_wrapper_ident<'a, 'b>(
+            args: impl pyo3::derive_utils::WrapPyFunctionArguments<'a, 'b>
+        ) -> pyo3::PyObject {
+            let (py, maybe_module) = args.arguments();
             #wrapper
 
             let _def = pyo3::class::PyMethodDef {
@@ -203,12 +206,25 @@ pub fn add_fn_to_module(
                 ml_doc: #doc,
             };
 
+            let (mod_ptr, name) = if let Some(m) = maybe_module {
+                let mod_ptr = <pyo3::types::PyModule as ::pyo3::conversion::AsPyPointer>::as_ptr(m);
+                let name = unsafe { pyo3::ffi::PyModule_GetNameObject(mod_ptr) };
+                if name.is_null() {
+                    let err = PyErr::fetch(py);
+                    return <PyErr as pyo3::conversion::IntoPy<PyObject>>::into_py(err, py);
+                }
+                (mod_ptr, name)
+            } else {
+                (std::ptr::null_mut(), std::ptr::null_mut())
+            };
+
             let function = unsafe {
                 pyo3::PyObject::from_owned_ptr(
                     py,
-                    pyo3::ffi::PyCFunction_New(
+                    pyo3::ffi::PyCFunction_NewEx(
                         Box::into_raw(Box::new(_def.as_method_def())),
-                        ::std::ptr::null_mut()
+                        mod_ptr,
+                        name
                     )
                 )
             };

src/derive_utils.rs

@@ -207,3 +207,24 @@ where
         <R as std::convert::TryFrom<&'a PyCell<T>>>::try_from(cell)
     }
 }
+
+/// Trait to abstract over the arguments of Python function wrappers.
+#[doc(hidden)]
+pub trait WrapPyFunctionArguments<'a, 'b> {
+    fn arguments(self) -> (Python<'b>, Option<&'a PyModule>);
+}
+
+impl<'a, 'b> WrapPyFunctionArguments<'a, 'b> for Python<'b> {
+    fn arguments(self) -> (Python<'b>, Option<&'a PyModule>) {
+        (self, None)
+    }
+}
+
+impl<'a, 'b> WrapPyFunctionArguments<'a, 'b> for &'a PyModule
+where
+    'a: 'b,
+{
+    fn arguments(self) -> (Python<'b>, Option<&'a PyModule>) {
+        (self.py(), Some(self))
+    }
+}

src/lib.rs

@@ -71,7 +71,7 @@
 //! #[pymodule]
 //! /// A Python module implemented in Rust.
 //! fn string_sum(py: Python, m: &PyModule) -> PyResult<()> {
-//!     m.add_wrapped(wrap_pyfunction!(sum_as_string))?;
+//!     m.add_function(wrap_pyfunction!(sum_as_string))?;
 //!
 //!     Ok(())
 //! }

src/python.rs

@@ -134,7 +134,7 @@ impl<'p> Python<'p> {
     /// let gil = Python::acquire_gil();
     /// let py = gil.python();
     /// let m = PyModule::new(py, "pcount").unwrap();
-    /// m.add_wrapped(wrap_pyfunction!(parallel_count)).unwrap();
+    /// m.add_function(wrap_pyfunction!(parallel_count)).unwrap();
     /// let locals = [("pcount", m)].into_py_dict(py);
     /// py.run(r#"
     ///    s = ["Flow", "my", "tears", "the", "Policeman", "Said"]

src/types/module.rs

@@ -194,11 +194,50 @@ impl PyModule {
     /// ```rust,ignore
     /// m.add("also_double", wrap_pyfunction!(double)(py));
     /// ```
+    ///
+    /// **This function will be deprecated in the next release. Please use the specific
+    /// [add_function] and [add_module] functions instead.**
     pub fn add_wrapped(&self, wrapper: &impl Fn(Python) -> PyObject) -> PyResult<()> {
         let function = wrapper(self.py());
         let name = function
             .getattr(self.py(), "__name__")
             .expect("A function or module must have a __name__");
         self.add(name.extract(self.py()).unwrap(), function)
     }
+
+    /// Adds a (sub)module to a module.
+    ///
+    /// Use this together with `#[pymodule]` and [wrap_pymodule!].
+    ///
+    /// ```rust,ignore
+    /// m.add_module(wrap_pymodule!(utils));
+    /// ```
+    pub fn add_module(&self, wrapper: &impl Fn(Python) -> PyObject) -> PyResult<()> {
+        let function = wrapper(self.py());
+        let name = function
+            .getattr(self.py(), "__name__")
+            .expect("A module must have a __name__");
+        self.add(name.extract(self.py()).unwrap(), function)
+    }
+
+    /// Adds a function to a module, using the functions __name__ as name.
+    ///
+    /// Use this together with the`#[pyfunction]` and [wrap_pyfunction!].
+    ///
+    /// ```rust,ignore
+    /// m.add_function(wrap_pyfunction!(double));
+    /// ```
+    ///
+    /// You can also add a function with a custom name using [add](PyModule::add):
+    ///
+    /// ```rust,ignore
+    /// m.add("also_double", wrap_pyfunction!(double)(py, m));
+    /// ```
+    pub fn add_function<'a>(&'a self, wrapper: &impl Fn(&'a Self) -> PyObject) -> PyResult<()> {
+        let function = wrapper(self);
+        let name = function
+            .getattr(self.py(), "__name__")
+            .expect("A function or module must have a __name__");
+        self.add(name.extract(self.py()).unwrap(), function)
+    }
 }

tests/test_module.rs

@@ -35,7 +35,7 @@ fn double(x: usize) -> usize {
 
 /// This module is implemented in Rust.
 #[pymodule]
-fn module_with_functions(py: Python, m: &PyModule) -> PyResult<()> {
+fn module_with_functions(_py: Python, m: &PyModule) -> PyResult<()> {
     use pyo3::wrap_pyfunction;
 
     #[pyfn(m, "sum_as_string")]
@@ -60,8 +60,8 @@ fn module_with_functions(py: Python, m: &PyModule) -> PyResult<()> {
 
     m.add("foo", "bar").unwrap();
 
-    m.add_wrapped(wrap_pyfunction!(double)).unwrap();
-    m.add("also_double", wrap_pyfunction!(double)(py)).unwrap();
+    m.add_function(wrap_pyfunction!(double)).unwrap();
+    m.add("also_double", wrap_pyfunction!(double)(m)).unwrap();
 
     Ok(())
 }
@@ -157,7 +157,7 @@ fn r#move() -> usize {
 fn raw_ident_module(_py: Python, module: &PyModule) -> PyResult<()> {
     use pyo3::wrap_pyfunction;
 
-    module.add_wrapped(wrap_pyfunction!(r#move))
+    module.add_function(wrap_pyfunction!(r#move))
 }
 
 #[test]
@@ -182,7 +182,7 @@ fn custom_named_fn() -> usize {
 fn foobar_module(_py: Python, m: &PyModule) -> PyResult<()> {
     use pyo3::wrap_pyfunction;
 
-    m.add_wrapped(wrap_pyfunction!(custom_named_fn))?;
+    m.add_function(wrap_pyfunction!(custom_named_fn))?;
     m.dict().set_item("yay", "me")?;
     Ok(())
 }
@@ -216,7 +216,7 @@ fn subfunction() -> String {
 fn submodule(_py: Python, module: &PyModule) -> PyResult<()> {
     use pyo3::wrap_pyfunction;
 
-    module.add_wrapped(wrap_pyfunction!(subfunction))?;
+    module.add_function(wrap_pyfunction!(subfunction))?;
     Ok(())
 }
 
@@ -229,8 +229,8 @@ fn superfunction() -> String {
 fn supermodule(_py: Python, module: &PyModule) -> PyResult<()> {
     use pyo3::{wrap_pyfunction, wrap_pymodule};
 
-    module.add_wrapped(wrap_pyfunction!(superfunction))?;
-    module.add_wrapped(wrap_pymodule!(submodule))?;
+    module.add_function(wrap_pyfunction!(superfunction))?;
+    module.add_module(wrap_pymodule!(submodule))?;
     Ok(())
 }
 
@@ -268,7 +268,7 @@ fn vararg_module(_py: Python, m: &PyModule) -> PyResult<()> {
         ext_vararg_fn(py, a, vararg)
     }
 
-    m.add_wrapped(pyo3::wrap_pyfunction!(ext_vararg_fn))
+    m.add_function(pyo3::wrap_pyfunction!(ext_vararg_fn))
         .unwrap();
     Ok(())
 }