From 6f7b994684032060f0a2d7af82f4f3572293b8d6 Mon Sep 17 00:00:00 2001
From: littleblack111 <littleblack11111@gmail.com>
Date: Thu, 12 Jun 2025 21:41:41 +0800
Subject: internal!: organized internal structure, using cmake now

---
 src/core/sessionManager.cpp | 141 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 src/core/sessionManager.cpp

(limited to 'src/core/sessionManager.cpp')

diff --git a/src/core/sessionManager.cpp b/src/core/sessionManager.cpp
new file mode 100644
index 0000000..6c002a5
--- /dev/null
+++ b/src/core/sessionManager.cpp
@@ -0,0 +1,141 @@
+#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)
+				// 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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