libudx

udx is reliable, multiplex, and congestion controlled streams over udp.

It's written in C99 and depends on libuv.

It is pre-alpha wip (there be dragons), but at a stage where it's safe for developers to poke at.

The main purpose is to be a building block for P2P networking. It therefore doesn't come with any handshaking protocol, encryption, and things like that - just reliable, fast, streams.

API

TODO

Node.js bindings

npm install udx-native

Building

Two build setups are available: A GYP build and a CMake build.

GYP

The GYP build is used for building a dynamic library for use in Node.js.

node-gyp configure
node-gyp build

The above commands are run as part of npm install.

CMake

The CMake build is used for building static and dynamic libraries for use outside of Node.js.

cmake -S . -B build
cmake --build build

Debugging

When debugging native code, make sure to configure a debug build:

# GYP
node-gyp configure --debug

# CMake
cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug

Memory errors

To diagnose and debug memory errors, such as leaks and use-after-free, the collection of sanitizers provided by LLVM are recommended. The sanitizers can be enabled by passing additional CFLAGS and/or LDFLAGS to the CMake or GYP build:

# GYP
CFLAGS=<...> LDFLAGS=<...> node-gyp build

# CMake
CFLAGS=<...> LDFLAGS=<...> cmake -S . -B build

To read more about the various sanitizers and how to use them, see:

• https://clang.llvm.org/docs/AddressSanitizer.html
• https://clang.llvm.org/docs/MemorySanitizer.html
• https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html
• https://clang.llvm.org/docs/LeakSanitizer.html

⚠️ LeakSanitizer is still experimental and currently requires a newer version of LLVM on macOS. If using Homebrew, brew install llvm and CC=/usr/local/opt/llvm/bin/clang should be sufficient.

LICENSE

MIT