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#include "sessionManager.hpp"
#include "IOManager.hpp"
#include "chatServer.hpp"
#include "format.hpp"
#include "log.hpp"
#include "session.hpp"
#include <algorithm>
#include <mutex>
#include <ranges>
#include <unistd.h>
#include <utility>
void CSessionManager::shutdownSessions() {
std::unique_lock<std::mutex> lock(m_mutex);
if (m_vSessions.empty())
return;
for (auto &session : m_vSessions) {
lock.unlock();
kick(&session, false, "Server shutting down");
lock.lock();
}
}
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() {
std::lock_guard<std::mutex> lock(m_mutex);
for (auto &[thread, session] : m_vSessions) {
if (thread.joinable())
thread.detach();
kick(session.get());
}
log(SYS, "SessionManager: bye");
}
std::pair<std::jthread, std::shared_ptr<CSession>> *CSessionManager::newSession() {
std::shared_ptr<CSession> session = std::make_shared<CSession>();
std::unique_lock<std::mutex> lock(m_mutex);
const auto instance = &m_vSessions.emplace_back(std::jthread(&CSession::run, session.get()), session);
lock.unlock();
instance->second->setSelf(instance);
return instance;
}
void CSessionManager::run() {
while (true)
newSession();
}
void CSessionManager::broadcast(const std::string &msg, std::optional<const CSession *const> self) const {
std::unique_lock<std::mutex> lock(m_mutex);
for (const auto &[thread, session] : m_vSessions) {
lock.unlock();
if (!self || (self && session.get() != *self))
session->write(msg);
lock.lock();
}
g_pIOManager->addCustom({"", msg});
}
void CSessionManager::broadcast(const CChatManager::SMessage &msg) const {
std::unique_lock<std::mutex> lock(m_mutex);
for (const auto &[thread, session] : m_vSessions) {
lock.unlock();
if (!session)
continue;
session->writeChat(msg);
lock.lock();
}
g_pIOManager->addMessage(msg);
}
bool CSessionManager::nameExists(const std::string &name) {
std::unique_lock<std::mutex> lock(m_mutex);
auto it = std::ranges::find_if(m_vSessions, [&name](const auto &s) { return s.second->getName() == name; });
lock.unlock();
if (it != m_vSessions.end()) {
if (!it->second->isValid()) {
kick(it->second.get(), true, "Connection lost");
return false;
}
return true;
}
return false;
}
CSession *CSessionManager::getByName(const std::string &name) const {
std::lock_guard<std::mutex> lock(m_mutex);
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.get() : nullptr;
}
CSession *CSessionManager::getByIp(const std::string &ip) const {
std::lock_guard<std::mutex> lock(m_mutex);
const auto it = std::ranges::find_if(m_vSessions, [&ip](const auto &s) { log(LOG, s.second->m_ip); return s.second->m_ip == ip; });
return it != m_vSessions.end() ? it->second.get() : nullptr;
}
CSession *CSessionManager::getByPtr(const uintptr_t &p) const {
std::lock_guard<std::mutex> lock(m_mutex);
const auto it = std::ranges::find_if(m_vSessions, [&p](const auto &s) { return (uintptr_t)s.second.get() == p; });
return it != m_vSessions.end() ? it->second.get() : nullptr;
}
std::vector<std::shared_ptr<CSession>> CSessionManager::getSessions() const {
std::lock_guard<std::mutex> lock(m_mutex);
return m_vSessions | std::views::transform([](const auto &s) { return s.second; }) | std::ranges::to<std::vector>();
}
void CSessionManager::kick(CSession *session, const bool kill, const std::string &reason) {
std::unique_lock<std::mutex> lock(m_mutex);
for (auto &_session : m_vSessions) {
lock.unlock();
if (_session.second.get() == session)
kick(&_session, kill, reason);
lock.lock();
}
}
void CSessionManager::kick(std::pair<std::jthread, std::shared_ptr<CSession>> *session, const bool kill, const std::string &reason) {
std::unique_lock<std::mutex> lock(m_mutex);
auto it = std::ranges::find_if(m_vSessions, [session](const auto &s) { return s.second.get() == session->second.get(); });
lock.unlock();
if (session->second)
// 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->second->m_name), session->second.get());
lock.lock();
if (it != m_vSessions.end()) {
lock.unlock();
if (!reason.empty()) {
lock.unlock();
it->second->setDeaf(false);
it->second->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();
lock.lock();
m_vSessions.erase(it);
lock.unlock();
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);
}
}
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