Seasocks

An embeddable C++ websockets server

Why?

How?

int main() {
  auto logger = make_shared<PrintfLogger>(Logger::DEBUG);
  Server server(logger);

  server.serve("web", 9000);
}

Websockets

int main() {
  auto logger = make_shared<PrintfLogger>(Logger::DEBUG);
  Server server(logger);
  server.addWebSocketHandler("/chat", make_shared<Handler>());
  server.serve("web", 9000);
}

Websockets

struct Handler : WebSocket::Handler {
  unordered_set<WebSocket *> _cons;

  void onConnect(WebSocket *con) override {
    _cons.emplace(con);
    send(con->credentials()->username + " has joined");
  }

  void onDisconnect(WebSocket *con) override {
    _cons.erase(con);
    send(con->credentials()->username + " has left");
  }

  void onData(WebSocket *con, const char *data) override
    { send(con->credentials()->username + ": " + data); }

  void send(string msg)
    { for (auto *con : _cons) con->send(msg); }
};

Threading

std::thread tick([&]{
  for (;;) { sleep(1); myHandler->tick(); }
});
tick.detach();
            

Threading

void MyHandler::tick() {
  // anything interesting has to happen on the server
  // thread. It's pretty easy to run work there:
  server().execute([this]{
    send("Tick!");
  });
}

Page handlers

• Derive from PageHandler
• Handles GET, POST, PUT, etc
• Utility classes, CrackedUri, RootPageHandler
• Pluggable authentication

Conclusions

• Web command & control in C++ is easy!
• https://github.com/mattgodbolt/seasocks