add connection limiter stats to status command

include/TConnectionLimiter.h

@@ -8,6 +8,15 @@
 
 class TConnectionLimiter {
 public:
+    struct TStats {
+        size_t CurrentGlobal = 0;
+        size_t MaxGlobal = 0;
+        size_t ActiveIpBuckets = 0;
+        size_t CurrentMaxPerIp = 0;
+        size_t MaxPerIp = 0;
+        size_t SaturatedIpBuckets = 0;
+    };
+
     class TGuard {
     public:
         TGuard() = default;
@@ -36,6 +45,7 @@ public:
     TConnectionLimiter(size_t maxPerIp, size_t maxGlobal);
 
     [[nodiscard]] std::optional<TGuard> TryAcquire(const std::string& ip);
+    [[nodiscard]] TStats GetStats();
 
 private:
     void Release(const std::string& ip) {

include/TNetwork.h

@@ -48,6 +48,7 @@ public:
     void SendToAll(TClient* c, const std::vector<uint8_t>& Data, bool Self, bool Rel);
     void UpdatePlayer(TClient& Client);
     boost::system::error_code ReadWithTimeout(TConnection& Connection, void* Buf, size_t Len, std::chrono::steady_clock::duration Timeout);
+    [[nodiscard]] TConnectionLimiter::TStats GetConnectionLimiterStats() { return mConnectionLimiter.GetStats(); }
 
     TResourceManager& ResourceManager() const { return mResourceManager; }
 

src/TConnectionLimiter.cpp

@@ -32,6 +32,24 @@ std::optional<TConnectionLimiter::TGuard> TConnectionLimiter::TryAcquire(const s
     return TGuard(this, ip);
 }
 
+TConnectionLimiter::TStats TConnectionLimiter::GetStats() {
+    std::unique_lock Lock { mMutex };
+    TStats Stats;
+    Stats.CurrentGlobal = mGlobal;
+    Stats.MaxGlobal = mMaxGlobal;
+    Stats.ActiveIpBuckets = mPerIp.size();
+    Stats.MaxPerIp = mMaxPerIp;
+    for (const auto& [_, Count] : mPerIp) {
+        if (Count > Stats.CurrentMaxPerIp) {
+            Stats.CurrentMaxPerIp = Count;
+        }
+        if (Count >= mMaxPerIp) {
+            ++Stats.SaturatedIpBuckets;
+        }
+    }
+    return Stats;
+}
+
 TConnectionLimiter::TGuard::TGuard(TConnectionLimiter* owner, std::string ip)
     : mOwner(owner)
     , mIp(std::move(ip)) {

src/TConsole.cpp

@@ -653,6 +653,7 @@ void TConsole::Command_Status(const std::string&, const std::vector<std::string>
     SystemsShutdownList = SystemsShutdownList.substr(0, SystemsShutdownList.size() - 2);
 
     auto ElapsedTime = mLuaEngine->Server().UptimeTimer.GetElapsedTime();
+    auto ConnectionLimiterStats = mLuaEngine->Network().GetConnectionLimiterStats();
 
     Status << "BeamMP-Server Status:\n"
            << "\tTotal Players:             " << mLuaEngine->Server().ClientCount() << "\n"
@@ -667,6 +668,11 @@ void TConsole::Command_Status(const std::string&, const std::vector<std::string>
            << "\t\tStates:                      " << mLuaEngine->GetLuaStateCount() << "\n"
            << "\t\tEvent timers:                " << mLuaEngine->GetTimedEventsCount() << "\n"
            << "\t\tEvent handlers:              " << mLuaEngine->GetRegisteredEventHandlerCount() << "\n"
+           << "\tConnection limiter:\n"
+           << "\t\tActive/Max global:           " << ConnectionLimiterStats.CurrentGlobal << "/" << ConnectionLimiterStats.MaxGlobal << "\n"
+           << "\t\tActive IP buckets:           " << ConnectionLimiterStats.ActiveIpBuckets << "\n"
+           << "\t\tHighest single IP load:      " << ConnectionLimiterStats.CurrentMaxPerIp << "/" << ConnectionLimiterStats.MaxPerIp << "\n"
+           << "\t\tSaturated IP buckets:        " << ConnectionLimiterStats.SaturatedIpBuckets << "\n"
            << "\tSubsystems:\n"
            << "\t\tGood/Starting/Bad:           " << SystemsGood << "/" << SystemsStarting << "/" << SystemsBad << "\n"
            << "\t\tShutting down/Shut down:     " << SystemsShuttingDown << "/" << SystemsShutdown << "\n"