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#pragma once
#include <cstdint>
#include <functional>
#include <map>
#include <netinet/in.h>
#include <span>
#include <vector>
#include "net/packet.hpp"
namespace net {
class conn {
int sock_fd;
sockaddr_in conn_addr;
socklen_t conn_addr_size;
using handler_list = std::vector<std::function<bool(std::span<uint8_t>)>>;
std::array<handler_list, 256> handlers;
std::map<uint16_t, handler_list> netmodule_handlers;
private:
packet::packet_header read_header()
{
uint16_t packet_size;
uint8_t id;
recv(packet_size);
recv(id);
return { id, packet_size - 3 };
}
public:
conn(int sock_fd, sockaddr_in conn_addr, socklen_t conn_addr_size)
: sock_fd(sock_fd)
, conn_addr(conn_addr)
, conn_addr_size(conn_addr_size)
{
}
~conn()
{
close(sock_fd);
}
ssize_t send(std::span<uint8_t> data)
{
auto bytes = ::send(sock_fd, data.data(), data.size_bytes(), 0);
if (bytes < 0) {
throw std::runtime_error(strerror(errno));
}
return bytes;
}
template <std::integral T>
ssize_t send(T t)
{
t = to_little(t);
auto bytes = ::send(sock_fd, &t, sizeof(T), 0);
if (bytes < 0) {
throw std::runtime_error(strerror(errno));
}
return bytes;
}
ssize_t recv(std::span<uint8_t> data)
{
if (data.size_bytes() == 0) {
return 0;
}
auto bytes = ::recv(sock_fd, data.data(), data.size_bytes(), 0);
if (bytes <= 0) {
throw std::runtime_error(strerror(errno));
}
return bytes;
}
template <std::integral T>
ssize_t recv(T& t)
{
auto bytes = ::recv(sock_fd, &t, sizeof(T), 0);
if (bytes <= 0) {
throw std::runtime_error(strerror(errno));
}
t = to_little(t);
if (bytes != sizeof(T)) {
throw std::runtime_error(strerror(errno));
}
return bytes;
}
template <packet::packet T>
void expect_packet(T& t)
{
auto [id, len] = read_header();
assert(id == T::packet_id);
if (len > 0) {
std::vector<uint8_t> payload(len);
recv(payload);
decode_packet(payload, t);
}
}
template <packet::packet P, typename H>
void reg_handler(H h)
{
handlers[P::packet_id].push_back([this, h](std::span<uint8_t> payload) {
P t;
if (payload.size() > 0) {
packet::decode_packet(payload, t);
}
return h(t);
});
}
template <packet::netmodule P, typename H>
void reg_handler(H h)
{
netmodule_handlers[P::module_id].push_back([this, h](std::span<uint8_t> payload) {
P t;
if (payload.size() > 0) {
packet::decode_packet(payload, t);
}
return h(t);
});
}
template <packet::packet T>
void send_packet(T p)
{
auto payload = encode_packet(p);
send(int16_t(payload.size() + 3));
send(T::packet_id);
if (payload.size() > 0) {
send(payload);
}
}
bool handle_netmodule(std::span<uint8_t> payload)
{
uint16_t id;
std::memcpy(&id, payload.data(), sizeof(id));
id = to_little(id);
if (netmodule_handlers[id].size() <= 0) {
// currently i won't bother implementing netmodules
// FIXME: return false
return true;
}
for (auto& h : handlers[id]) {
if (h(payload.subspan(2)) == true) {
return false;
}
}
return true;
}
bool handle()
{
auto [id, len] = read_header();
if (id == 0) {
return false;
}
std::vector<uint8_t> payload(len);
recv(payload);
// got netmodule
if (id == 82) {
return handle_netmodule(payload);
}
if (handlers[id].size() <= 0) {
return false;
}
for (auto& h : handlers[id]) {
if (h(payload) == true) {
break;
}
}
return true;
}
};
}
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