Version b0.1 (Beta 0.1) - Refactor some stuff and move session_registry to .cpp file

src/common/session_registry.cpp

@@ -0,0 +1,100 @@
+// session_registry.cpp - Session Registry for ColumnLynx
+// Copyright (C) 2025 DcruBro
+// Distributed under the terms of the GNU General Public License, either version 2 only or version 3. See LICENSES/ for details.
+
+#include <columnlynx/common/net/session_registry.hpp>
+
+namespace ColumnLynx::Net {
+    void SessionRegistry::put(uint64_t sessionID, std::shared_ptr<SessionState> state) {
+        std::unique_lock lock(mMutex);
+        mSessions[sessionID] = std::move(state);
+        mIPSessions[mSessions[sessionID]->clientTunIP] = mSessions[sessionID];
+    }
+
+    std::shared_ptr<const SessionState> SessionRegistry::get(uint64_t sessionID) const {
+        std::shared_lock lock(mMutex);
+        auto it = mSessions.find(sessionID);
+        return (it == mSessions.end()) ? nullptr : it->second;
+    }
+
+    std::shared_ptr<const SessionState> SessionRegistry::getByIP(uint32_t ip) const {
+        std::shared_lock lock(mMutex);
+        auto it = mIPSessions.find(ip);
+        return (it == mIPSessions.end()) ? nullptr : it->second;
+    }
+
+    std::unordered_map<uint64_t, std::shared_ptr<SessionState>> SessionRegistry::snapshot() const {
+        std::unordered_map<uint64_t, std::shared_ptr<SessionState>> snap;
+        std::shared_lock lock(mMutex);
+        snap = mSessions;
+        return snap;
+    }
+
+    void SessionRegistry::erase(uint64_t sessionID) {
+        std::unique_lock lock(mMutex);
+        mSessions.erase(sessionID);
+    }
+
+    void SessionRegistry::cleanupExpired() {
+        std::unique_lock lock(mMutex);
+        auto now = std::chrono::steady_clock::now();
+        for (auto it = mSessions.begin(); it != mSessions.end(); ) {
+            if (it->second && it->second->expires <= now) {
+                it = mSessions.erase(it);
+            } else {
+                ++it;
+            }
+        }
+
+        for (auto it = mIPSessions.begin(); it != mIPSessions.end(); ) {
+            if (it->second && it->second->expires <= now) {
+                it = mIPSessions.erase(it);
+            } else {
+                ++it;
+            }
+        }
+    }
+
+    int SessionRegistry::size() const {
+        std::shared_lock lock(mMutex);
+        return static_cast<int>(mSessions.size());
+    }
+
+    uint32_t SessionRegistry::getFirstAvailableIP(uint32_t baseIP, uint8_t mask) const {
+        std::shared_lock lock(mMutex);
+
+        uint32_t hostCount = (1u << (32 - mask));
+        uint32_t firstHost = 2;
+        uint32_t lastHost  = hostCount - 2;
+
+        for (uint32_t offset = firstHost; offset <= lastHost; offset++) {
+            uint32_t candidateIP = baseIP + offset;
+            if (mIPSessions.find(candidateIP) == mIPSessions.end()) {
+                return candidateIP;
+            }
+        }
+    
+        return 0;
+    }
+
+    void SessionRegistry::lockIP(uint64_t sessionID, uint32_t ip) {
+        std::unique_lock lock(mMutex);
+        mSessionIPs[sessionID] = ip;
+        
+        /*if (mIPSessions.find(sessionID) == mIPSessions.end()) {
+            Utils::debug("yikes");
+        }*/
+        mIPSessions[ip] = mSessions.find(sessionID)->second;
+    }
+
+    void SessionRegistry::deallocIP(uint64_t sessionID) {
+        std::unique_lock lock(mMutex);
+    
+        auto it = mSessionIPs.find(sessionID);
+        if (it != mSessionIPs.end()) {
+            uint32_t ip = it->second;
+            mIPSessions.erase(ip);
+            mSessionIPs.erase(it);
+        }
+    }
+}