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#include "client/pch.hh"
#include "client/bother.hh"
#include "shared/protocol.hh"
#include "client/globals.hh"
// Maximum amount of peers used for bothering
constexpr static std::size_t BOTHER_PEERS = 4;
struct BotherQueueItem final {
unsigned int identity;
std::string hostname;
std::uint16_t port;
};
static ENetHost *bother_host;
static entt::dispatcher bother_dispatcher;
static std::unordered_set<unsigned int> bother_set;
static std::deque<BotherQueueItem> bother_queue;
static void on_status_response_packet(const protocol::StatusResponse &packet)
{
auto identity = static_cast<unsigned int>(reinterpret_cast<std::uintptr_t>(packet.peer->data));
bother_set.erase(identity);
BotherResponseEvent event;
event.identity = identity;
event.is_server_unreachable = false;
event.protocol_version = packet.version;
event.num_players = packet.num_players;
event.max_players = packet.max_players;
event.motd = packet.motd;
globals::dispatcher.trigger(event);
enet_peer_disconnect(packet.peer, protocol::CHANNEL);
}
void bother::init(void)
{
bother_host = enet_host_create(nullptr, BOTHER_PEERS, 1, 0, 0);
bother_dispatcher.clear();
bother_set.clear();
bother_dispatcher.sink<protocol::StatusResponse>().connect<&on_status_response_packet>();
}
void bother::deinit(void)
{
enet_host_destroy(bother_host);
bother_dispatcher.clear();
bother_set.clear();
}
void bother::update_late(void)
{
unsigned int free_peers = 0U;
// Figure out how much times we can call
// enet_host_connect and reallistically succeed
for(unsigned int i = 0U; i < bother_host->peerCount; ++i) {
if(bother_host->peers[i].state != ENET_PEER_STATE_DISCONNECTED)
continue;
free_peers += 1U;
}
for(unsigned int i = 0U; (i < free_peers) && bother_queue.size(); ++i) {
const auto &item = bother_queue.front();
ENetAddress address;
enet_address_set_host(&address, item.hostname.c_str());
address.port = enet_uint16(item.port);
if(auto peer = enet_host_connect(bother_host, &address, 1, 0)) {
peer->data = reinterpret_cast<void *>(static_cast<std::uintptr_t>(item.identity));
bother_set.insert(item.identity);
enet_host_flush(bother_host);
}
bother_queue.pop_front();
}
ENetEvent enet_event;
if(0 < enet_host_service(bother_host, &enet_event, 0)) {
if(enet_event.type == ENET_EVENT_TYPE_CONNECT) {
protocol::StatusRequest packet;
packet.version = protocol::VERSION;
protocol::send(enet_event.peer, protocol::encode(packet));
return;
}
if(enet_event.type == ENET_EVENT_TYPE_RECEIVE) {
protocol::decode(bother_dispatcher, enet_event.packet, enet_event.peer);
enet_packet_destroy(enet_event.packet);
return;
}
if(enet_event.type == ENET_EVENT_TYPE_DISCONNECT) {
auto identity = static_cast<unsigned int>(reinterpret_cast<std::uintptr_t>(enet_event.peer->data));
if(bother_set.count(identity)) {
BotherResponseEvent event;
event.identity = identity;
event.is_server_unreachable = true;
globals::dispatcher.trigger(event);
}
bother_set.erase(identity);
return;
}
}
}
void bother::ping(unsigned int identity, const char *host, std::uint16_t port)
{
if(bother_set.count(identity)) {
// Already in the process
return;
}
for(const auto &item : bother_queue) {
if(item.identity == identity) {
// Already in the queue
return;
}
}
BotherQueueItem item;
item.identity = identity;
item.hostname = std::string(host);
item.port = port;
bother_queue.push_back(item);
}
void bother::cancel(unsigned int identity)
{
bother_set.erase(identity);
auto item = bother_queue.cbegin();
while(item != bother_queue.cend()) {
if(item->identity == identity) {
item = bother_queue.erase(item);
continue;
}
item = std::next(item);
}
for(unsigned int i = 0U; i < bother_host->peerCount; ++i) {
if(bother_host->peers[i].data == reinterpret_cast<void *>(static_cast<std::uintptr_t>(identity))) {
enet_peer_reset(&bother_host->peers[i]);
break;
}
}
}
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