hyprctl: added --follow option to rolliglog (#6325)

Co-authored-by: Крылов Александр <aleksandr.krylov@hyperus.team>

src/debug/RollingLogFollow.hpp

@@ -0,0 +1,65 @@
+#pragma once
+
+#include <shared_mutex>
+
+namespace Debug {
+    struct RollingLogFollow {
+        std::unordered_map<int, std::string> socketToRollingLogFollowQueue;
+        std::shared_mutex                    m;
+        bool                                 running                    = false;
+        static constexpr size_t              ROLLING_LOG_FOLLOW_TOO_BIG = 8192;
+
+        // Returns true if the queue is empty for the given socket
+        bool isEmpty(int socket) {
+            std::shared_lock<std::shared_mutex> r(m);
+            return socketToRollingLogFollowQueue[socket].empty();
+        }
+
+        std::string DebugInfo() {
+            std::shared_lock<std::shared_mutex> r(m);
+            return std::format("RollingLogFollow, got {} connections", socketToRollingLogFollowQueue.size());
+        }
+
+        std::string GetLog(int socket) {
+            std::unique_lock<std::shared_mutex> w(m);
+
+            const std::string                   ret = socketToRollingLogFollowQueue[socket];
+            socketToRollingLogFollowQueue[socket]   = "";
+
+            return ret;
+        };
+
+        void AddLog(std::string log) {
+            std::unique_lock<std::shared_mutex> w(m);
+            running = true;
+            std::vector<int> to_erase;
+            for (const auto& p : socketToRollingLogFollowQueue)
+                socketToRollingLogFollowQueue[p.first] += log + "\n";
+        }
+
+        bool IsRunning() {
+            std::shared_lock<std::shared_mutex> r(m);
+            return running;
+        }
+
+        void StopFor(int socket) {
+            std::unique_lock<std::shared_mutex> w(m);
+            socketToRollingLogFollowQueue.erase(socket);
+            if (socketToRollingLogFollowQueue.empty())
+                running = false;
+        }
+
+        void StartFor(int socket) {
+            std::unique_lock<std::shared_mutex> w(m);
+            socketToRollingLogFollowQueue[socket] = std::format("[LOG] Following log to socket: {} started\n", socket);
+            running                               = true;
+        }
+
+        static RollingLogFollow& Get() {
+            static RollingLogFollow     instance;
+            static std::mutex           gm;
+            std::lock_guard<std::mutex> lock(gm);
+            return instance;
+        };
+    };
+}