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#include "sessionManager.hpp"
#include "../io/IOManager.hpp"
#include "chatServer.hpp"
#include "../debug/format.hpp"
#include "../debug/log.hpp"
#include "session.hpp"
#include <algorithm>
#include <ranges>
#include <unistd.h>
#include <utility>
void CSessionManager::shutdownSessions() {
if (m_vSessions.empty())
return;
for (auto &[thread, session] : m_vSessions) {
if (session) {
session->setDeaf(false);
session->write("Server shutting down");
if (!session->getName().empty())
g_pSessionManager->broadcast(NFormatter::fmt(NONEWLINE, "{} has left the chat", session->getName()), std::weak_ptr<CSession>(session));
}
}
for (auto &[thread, session] : m_vSessions) {
if (thread.joinable())
thread.detach();
session.reset();
}
m_vSessions.clear();
}
CSessionManager::CSessionManager() {
if (std::atexit([]() {
if (g_pSessionManager)
g_pSessionManager->shutdownSessions();
}))
log(ERR, "Failed to register SessionManager atexit handler, will fallback to quick_exit after hang");
log(LOG, "SessionManager: initialized");
};
CSessionManager::~CSessionManager() {
for (auto &[thread, session] : m_vSessions) {
if (thread.joinable())
thread.detach();
kick(std::weak_ptr<CSession>(session));
}
log(SYS, "SessionManager: bye");
}
void CSessionManager::newSession() {
std::shared_ptr session = std::make_shared<CSession>();
auto &instance = m_vSessions.emplace_back(std::jthread([session]() { session->run(); }), session);
instance.second->self = std::weak_ptr<CSession>(instance.second);
}
void CSessionManager::run() {
while (true)
newSession();
}
void CSessionManager::broadcast(const std::string &msg, std::optional<std::weak_ptr<CSession>> self) const {
for (const auto &[thread, session] : m_vSessions)
if (!self || (self && session != self->lock()))
session->write(msg);
g_pIOManager->addCustom({"", msg});
}
void CSessionManager::broadcast(const CChatManager::SMessage &msg) const {
for (const auto &[thread, session] : m_vSessions) {
if (!session)
continue;
session->writeChat(msg);
}
g_pIOManager->addMessage(msg);
}
bool CSessionManager::nameExists(const std::string &name) {
auto it = std::ranges::find_if(m_vSessions, [&name](const auto &s) { return s.second->getName() == name; });
if (it != m_vSessions.end()) {
if (!it->second->isValid()) {
kick(std::weak_ptr<CSession>(it->second), true, "Connection lost");
return false;
}
return true;
}
return false;
}
std::shared_ptr<CSession> CSessionManager::getByName(const std::string &name) const {
auto it = std::ranges::find_if(m_vSessions, [&name](const auto &s) { return s.second->getName() == name; });
return it != m_vSessions.end() ? it->second : nullptr;
}
std::shared_ptr<CSession> CSessionManager::getByIp(const std::string &ip) const {
auto it = std::ranges::find_if(m_vSessions, [&ip](const auto &s) { log(LOG, s.second->getIp()); return s.second->getIp() == ip; });
return it != m_vSessions.end() ? it->second : nullptr;
}
std::vector<std::shared_ptr<CSession>> CSessionManager::getSessions() const {
return m_vSessions | std::views::transform([](const auto &s) { return s.second; }) | std::ranges::to<std::vector>();
}
void CSessionManager::kick(std::weak_ptr<CSession> session_weak, const bool kill, const std::string &reason) {
auto session = session_weak.lock();
if (!session)
return;
for (auto it = m_vSessions.begin(); it != m_vSessions.end(); ++it) {
if (it->second == session) {
if (session && !session->getName().empty())
// this only exist when the session is registered
// not sure why the second is null, but m_name definately is since it's setted during register
// but we don't need to notify people if the session didn't even "join"/register anyways
g_pSessionManager->broadcast(NFormatter::fmt(NONEWLINE, "{} has left the chat", session->getName()), session_weak);
if (!reason.empty()) {
session->setDeaf(false);
session->write(reason);
}
const auto native_handle = it->first.native_handle();
if (it->first.joinable())
it->first.detach(); // .detach the thread since it's removing itself
it->second.reset();
m_vSessions.erase(it);
if (kill && native_handle != 0)
// cancel(terminal/kill) the thread if it doesn't exit on its own
// pthread_cancel cuz it's the safest https://stackoverflow.com/a/3438576
// need a condition because it might crash if the thread is already dead
pthread_cancel(native_handle);
return;
}
}
}
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