beats-server/main.cpp

#include <map>
#include <string>

#include <lib/libwebsockets.h>
#include "websockets.h"

int uid = 0;
std::map<int, std::string> people_online;

// NOTE: we cannot use C++ ctors and dtors, because it will be allocated by libwebsockets (= C lib)
struct User {
	unsigned int index;
};

websockets::TestProtocol<User> default_protocol{
	// connection established
	[](User& user) -> int{
		user.index = uid++;
		people_online[user.index] = "";
		return 0;
	},
	// connection closed
	[](User& user) -> int{
		people_online.erase(user.index);
		return 0;
	},
	// write (will always come after receive)
	[](User& user) -> std::string{
		std::string string_to_send = "Other People:";
		for(auto x : people_online) if(x.first != user.index) string_to_send += " " + x.second;
		return string_to_send;
	},
	// receive
	[](User& user, std::string in) -> int{
		people_online[user.index] = in;
		return 0;
	}
};

static libwebsocket_protocols protocols[] = {
	WSstandard_protocol("default", default_protocol),
	{ NULL, NULL, 0 } // end of list
};

int main(int argc, char **argv){
	return websockets::default_main(argc, argv, protocols);
}