methane · Copilot · May 29, 2026 · May 29, 2026 · May 29, 2026 · May 29, 2026
diff --git a/.gitignore b/.gitignore
@@ -15,3 +15,4 @@ msgpack/*.cpp
 /tags
 /docs/_build
 .cache
+/target
diff --git a/Cargo.lock b/Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "msgpack-python-rust"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+name = "_cmsgpack"
+crate-type = ["cdylib"]
+
+[dependencies]
+pyo3 = { version = "0.23", features = ["extension-module"] }
diff --git a/DEVELOP.md b/DEVELOP.md
@@ -3,7 +3,7 @@
 ### Build
 
 ```
-$ make cython
+$ make all
 ```
 
 

diff --git a/MANIFEST.in b/MANIFEST.in
@@ -1,5 +1,7 @@
 include setup.py
 include COPYING
 include README.md
+include Cargo.toml
+recursive-include src *.rs
 recursive-include msgpack *.h *.c *.pyx
 recursive-include test *.py
diff --git a/Makefile b/Makefile
@@ -1,7 +1,7 @@
 PYTHON_SOURCES = msgpack test setup.py
 
 .PHONY: all
-all: cython
+all:
 	python setup.py build_ext -i -f
 
 .PHONY: format
@@ -20,12 +20,8 @@ doc:
 pyupgrade:
 	@find $(PYTHON_SOURCES) -name '*.py' -type f -exec pyupgrade --py37-plus '{}' \;
 
-.PHONY: cython
-cython:
-	cython msgpack/_cmsgpack.pyx
-
 .PHONY: test
-test: cython
+test:
 	pip install -e .
 	pytest -v test
 	MSGPACK_PUREPYTHON=1 pytest -v test
@@ -40,6 +36,7 @@ clean:
 	rm -f msgpack/_cmsgpack.cpp
 	rm -f msgpack/_cmsgpack.*.so
 	rm -f msgpack/_cmsgpack.*.pyd
+	rm -rf target
 	rm -rf msgpack/__pycache__
 	rm -rf test/__pycache__
 

diff --git a/README.md b/README.md
@@ -18,7 +18,7 @@ $ pip install msgpack
 
 ### Pure Python implementation
 
-The extension module in msgpack (`msgpack._cmsgpack`) does not support PyPy.
+The Rust extension module in msgpack (`msgpack._cmsgpack`) does not support PyPy.
 
 But msgpack provides a pure Python implementation (`msgpack.fallback`) for PyPy.
 

diff --git a/msgpack/__init__.py b/msgpack/__init__.py
@@ -10,46 +10,53 @@
 
 if os.environ.get("MSGPACK_PUREPYTHON"):
     from .fallback import Packer, Unpacker, unpackb
+    _using_cmsgpack = False
 else:
     try:
-        from ._cmsgpack import Packer, Unpacker, unpackb
+        from ._cmsgpack import Packer, Unpacker, pack, packb, unpack, unpackb
+        _using_cmsgpack = True
     except ImportError:
         from .fallback import Packer, Unpacker, unpackb
+        _using_cmsgpack = False
 
 
-def pack(o, stream, **kwargs):
-    """
-    Pack object `o` and write it to `stream`
+if not _using_cmsgpack:
 
-    See :class:`Packer` for options.
-    """
-    packer = Packer(**kwargs)
-    stream.write(packer.pack(o))
+    def pack(o, stream, **kwargs):
+        """
+        Pack object `o` and write it to `stream`
 
+        See :class:`Packer` for options.
+        """
+        packer = Packer(**kwargs)
+        stream.write(packer.pack(o))
 
-def packb(o, **kwargs):
-    """
-    Pack object `o` and return packed bytes
+    def packb(o, **kwargs):
+        """
+        Pack object `o` and return packed bytes
 
-    See :class:`Packer` for options.
-    """
-    return Packer(**kwargs).pack(o)
+        See :class:`Packer` for options.
+        """
+        return Packer(**kwargs).pack(o)
 
+    def unpack(stream, **kwargs):
+        """
+        Unpack an object from `stream`.
 
-def unpack(stream, **kwargs):
-    """
-    Unpack an object from `stream`.
+        Raises `ExtraData` when `stream` contains extra bytes.
+        See :class:`Unpacker` for options.
+        """
+        data = stream.read()
+        return unpackb(data, **kwargs)
 
-    Raises `ExtraData` when `stream` contains extra bytes.
-    See :class:`Unpacker` for options.
-    """
-    data = stream.read()
-    return unpackb(data, **kwargs)
+    # alias for compatibility to simplejson/marshal/pickle.
+    load = unpack
+    loads = unpackb
 
-
-# alias for compatibility to simplejson/marshal/pickle.
-load = unpack
-loads = unpackb
-
-dump = pack
-dumps = packb
+    dump = pack
+    dumps = packb
+else:
+    load = unpack
+    loads = unpackb
+    dump = pack
+    dumps = packb
diff --git a/pyproject.toml b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools >= 78.1.1"]
+requires = ["setuptools >= 78.1.1", "setuptools-rust>=1.8"]
 build-backend = "setuptools.build_meta"
 
 [project]

diff --git a/requirements.txt b/requirements.txt
@@ -1,3 +1,3 @@
-Cython==3.2.1
 setuptools==78.1.1
+setuptools-rust>=1.8
 build
diff --git a/setup.py b/setup.py
@@ -2,31 +2,23 @@
 import os
 import sys
 
-from setuptools import Extension, setup
+from setuptools import setup
+from setuptools_rust import Binding, RustExtension
 
 PYPY = hasattr(sys, "pypy_version_info")
 
-libraries = []
-macros = []
-ext_modules = []
-
-if sys.platform == "win32":
-    libraries.append("ws2_32")
-    macros = [("__LITTLE_ENDIAN__", "1")]
-
+rust_extensions = []
 if not PYPY and not os.environ.get("MSGPACK_PUREPYTHON"):
-    ext_modules.append(
-        Extension(
+    rust_extensions.append(
+        RustExtension(
             "msgpack._cmsgpack",
-            sources=["msgpack/_cmsgpack.c"],
-            libraries=libraries,
-            include_dirs=["."],
-            define_macros=macros,
+            path="Cargo.toml",
+            binding=Binding.PyO3,
         )
     )
-del libraries, macros
 
 setup(
-    ext_modules=ext_modules,
+    rust_extensions=rust_extensions,
     packages=["msgpack"],
+    zip_safe=False,
 )
-Original file line number
+Diff line change
@@ Expand Up / @@ -15,3 +15,4 @@ msgpack/*.cpp @@
     /tags
     /docs/_build
     .cache
+    /target