patrickjwhite / uWebSockets

Highly scalable WebSocket server library

`µWS` is one of the most lightweight, efficient & scalable WebSocket server implementations available. It features an easy-to-use, fully async object-oriented interface and scales to millions of connections using only a fraction of memory compared to the competition. License is zlib/libpng (very permissive & suits commercial applications).

• Planned SSL/TLS support (work in progress)
• Node.js bindings are planned and will target the ws interface.

Project is a work in progress, initial commit was 21 March, 2016. I'm planning to release something in a month or less.

Benchmarks table

Implementation	Memory scaling	Connection performance	Short message throughput	Huge message throughput
libwebsockets master(1.7-1.8)	µWS is 14x as lightweight	µWS is equal in performance	µWS is 3x as performant	µWS is equal in performance
ws v1.0.1 + binary addons	µWS is 52x as lightweight	µWS is 21x as performant	µWS is 23x as performant	µWS is 2x as performant
WebSocket++ v0.7.0	µWS is 63x as lightweight	µWS is 5x as performant	µWS is 2x as performant	µWS is 3x as performant

Quality control

• Valgrind clean
• Autobahn chapters 1 - 9 all pass.
• Small & efficient code base.

Overview

int main()
{
    /* this is an echo server that properly passes every supported Autobahn test */
    uWS::Server server(3000);
    server.onConnection([](uWS::Socket socket) {
        cout << "[Connection] clients: " << ++connections << endl;
    });

    server.onMessage([](uWS::Socket socket, const char *message, size_t length, OpCode opCode) {
        socket.send((char *) message, length, opCode);
    });

    server.onDisconnection([](uWS::Socket socket) {
        cout << "[Disconnection] clients: " << --connections << endl;
    });

    server.run();
}

Dependencies

• Unix (Linux, OS X)
• libuv
• OpenSSL