protowire-python
Python port of protowire — a protobuf-backed wire-format
toolkit. CPython 3.10+, MIT, nanobind FFI
over protowire-cpp. Verified
for byte-equivalence against the canonical Go reference and seven other
sibling ports.
The native extension uses nanobind with
scikit-build-core as the
build backend. The FFI boundary is intentionally narrow: Python sends a
serialized FileDescriptorSet plus a fully-qualified message name; binary
proto bytes flow back. google.protobuf.Message objects never cross the
language boundary.
Install
pip install protowire-python
The PyPI distribution is named protowire-python (the bare protowire
name was taken). The import name stays protowire:
from protowire import pxf, sbe, envelope
Wheels are published for CPython 3.10–3.13 on Linux × {x86_64, aarch64},
macOS × {x86_64, arm64}, and Windows × x86_64. On other platforms pip
will fall back to a source build (requires CMake ≥ 3.20 and a C++20
compiler).
API
from protowire import pxf, sbe, envelope
# PXF — schema implicit in the message type.
text = pxf.marshal(my_msg)
pxf.unmarshal(text, my_msg)
result = pxf.unmarshal_full(text, my_msg)
result.is_set("nested.value"), result.is_null("flag")
# SBE — codec built from one or more FileDescriptors with sbe annotations.
codec = sbe.Codec.from_message(OrderType)
data = codec.marshal(order)
codec.unmarshal(data, order_out)
view = codec.view(data); view.uint("order_id")
# Envelope — wire-compatible with the Go envelope package.
e = envelope.OK(200, b"payload")
e = envelope.Err(400, "VALIDATION", "bad input").error.with_field(
"name", "REQUIRED", "missing"
)
Build from source
git clone https://github.com/trendvidia/protowire-cpp.git ../protowire-cpp
python3 -m venv .venv
source .venv/bin/activate
pip install -e '.[test]'
pytest
The build looks for protowire-cpp
at ../protowire-cpp by default. Override with
PROTOWIRE_CPP_DIR=/abs/path pip install -e . or
pip install -e . --config-settings=cmake.define.PROTOWIRE_CPP_DIR=/abs/path.
Required: CMake ≥ 3.20, a C++20 compiler, protobuf headers + libs.
- Linux:
apt-get install protobuf-compiler libprotobuf-dev libprotoc-dev - macOS:
brew install protobuf - Windows:
vcpkg install protobufand pass the toolchain file viaCMAKE_TOOLCHAIN_FILE
Command-line tool
The protowire CLI is shared across every port and lives in the spec repo at
github.com/trendvidia/protowire/cmd/protowire.
Install:
go install github.com/trendvidia/protowire/cmd/protowire@latest
Python users use this library for in-process encode/decode and the shared CLI for command-line operations. There is no separate Python CLI binary.
Wire compatibility
Verified manually against the Go module:
- Go
pxf.Marshal→ file → Pythonpxf.unmarshalround-trips a representative AllTypes message. - Python
pxf.marshal→ file → Gopxf.Unmarshalround-trips equally.
Because the wire codec is the C++ one, this port inherits all of
protowire-cpp's
cross-port equivalence guarantees.
Limitations & open gaps
- No pure-Python fallback. A C++ toolchain (clang or gcc, plus CMake) is
required at install time on platforms where we don't ship a wheel.
Pure-
google.protobuf-Python encode/decode without C++ is not available — opening that up is a meaningful refactor and would need a separate decoder path. - The FFI is narrow on purpose.
google.protobuf.Messageobjects never cross the boundary — Python sends aFileDescriptorSet+ fully-qualified message name and bytes flow back. This keeps the C++ side type-stable but means Python callers serialize their messages once before each call. AMessageView-style zero-copy path would be welcome. - No standalone Python CLI. The shared CLI lives in trendvidia/protowire/cmd/protowire; Python callers either invoke that binary or use the in-process API.
- Free-threaded Python (PEP 703 / 3.13t) is untested. nanobind supports
it but the build hasn't been validated against
--disable-gilinterpreters.
Repository layout
protowire-python/
├── LICENSE # MIT
├── README.md
├── CHANGELOG.md
├── CONTRIBUTING.md, SECURITY.md,
│ GOVERNANCE.md, CODE_OF_CONDUCT.md
├── pyproject.toml # scikit-build-core + nanobind
├── CMakeLists.txt # links protowire-cpp
├── src/_protowire/module.cc # FFI entry point (nanobind)
├── src/protowire/ # pure-Python public API
├── tests/ # pytest suites
├── testdata/ # .proto fixtures
├── scripts/ # cross-port test harnesses
└── .github/ # CI: build matrix + cibuildwheel + CodeQL
1 maintainer
Metadata
1 maintainer
Release files for protowire-python 1.0.0
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| protowire_python-1.0.0.tar.gz | 51.1 kB | With provenance | Details for protowire_python-1.0.0.tar.gz |
Built distributions (wheels)
Total release size: 28.5 MB
Release files / protowire_python-1.0.0.tar.gz
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| Download URL | protowire_python-1.0.0-cp310-cp310-macosx_15_0_arm64.whl |
|---|---|
| Size | 1.6 MB |
| Tags | CPython 3.10 macOS 15.0+ ARM64 |
|
SHA-256 checksum How to use checksums |
cd1a04f9564f8ee36a04cafe14c18e5e5bda085e4fa940538e66141118b4fc17
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BLAKE2b-256 checksum How to use checksums |
8a6d59f5ec5dd3e4f4fffdaaca7a15b6a2c3f17cf855c5f67cd77a0afbc4e44a
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Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/6.1.0 CPython/3.13.12
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