feat: [hyprctl, core] added --follow option to rolliglog

Makefile

@@ -42,7 +42,7 @@ uninstall:
 pluginenv:
 	@echo -en "$(MAKE) pluginenv has been deprecated.\nPlease run $(MAKE) all && sudo $(MAKE) installheaders\n"
 	@exit 1
-	
+
 installheaders:
 	@if [ ! -f ./src/version.h ]; then echo -en "You need to run $(MAKE) all first.\n" && exit 1; fi
 

hyprctl/Strings.hpp

@@ -38,7 +38,8 @@ const std::string_view USAGE = R"#(usage: hyprctl [flags] <command> [args...|--h
     plugin ...          → Issue a plugin request
     reload [config-only] → Issue a reload to force reload the config. Pass
                           'config-only' to disable monitor reload
-    rollinglog          → Prints tail of the log
+    rollinglog          → Prints tail of the log. Also supports -f/--follow
+                          option
     setcursor <theme> <size> → Sets the cursor theme and reloads the cursor
                           manager
     seterror <color> <message...> → Sets the hyprctl error string. Color has
@@ -112,7 +113,7 @@ create <backend>:
 remove <name>:
     Removes virtual output. Pass the output's name, as found in
     'hyprctl monitors'
-    
+
 flags:
     See 'hyprctl --help')#";
 

hyprctl/main.cpp

@@ -1,9 +1,9 @@
-#include <ctype.h>
+#include <cctype>
 #include <netdb.h>
 #include <netinet/in.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/types.h>
@@ -12,7 +12,7 @@
 #include <unistd.h>
 #include <ranges>
 #include <algorithm>
-#include <signal.h>
+#include <csignal>
 #include <format>
 
 #include <iostream>
@@ -22,8 +22,9 @@
 #include <vector>
 #include <deque>
 #include <filesystem>
-#include <stdarg.h>
+#include <cstdarg>
 #include <regex>
+#include <sys/socket.h>
 
 #include "Strings.hpp"
 
@@ -98,13 +99,53 @@ std::vector<SInstanceData> instances() {
     return result;
 }
 
-int request(std::string arg, int minArgs = 0) {
+static volatile bool sigintReceived = false;
+void                 intHandler(int sig) {
+    sigintReceived = true;
+    std::cout << "[hyprctl] SIGINT received, closing connection" << std::endl;
+}
+
+int rollingRead(const int socket) {
+    sigintReceived = false;
+    signal(SIGINT, intHandler);
+
+    constexpr size_t              BUFFER_SIZE = 8192;
+    std::array<char, BUFFER_SIZE> buffer      = {0};
+    int                           sizeWritten = 0;
+    std::cout << "[hyprctl] reading from socket following up log:" << std::endl;
+    while (!sigintReceived) {
+        sizeWritten = read(socket, buffer.data(), BUFFER_SIZE);
+        if (sizeWritten < 0 && errno != EAGAIN) {
+            if (errno != EINTR)
+                std::cout << "Couldn't read (5) " << strerror(errno) << ":" << errno << std::endl;
+            close(socket);
+            return 5;
+        }
+
+        if (sizeWritten == 0)
+            break;
+
+        if (sizeWritten > 0) {
+            std::cout << std::string(buffer.data(), sizeWritten);
+            buffer.fill('\0');
+        }
+
+        usleep(100000);
+    }
+    close(socket);
+    return 0;
+}
+
+int request(std::string arg, int minArgs = 0, bool needRoll = false) {
     const auto SERVERSOCKET = socket(AF_UNIX, SOCK_STREAM, 0);
 
+    auto       t = timeval{.tv_sec = 0, .tv_usec = 100000};
+    setsockopt(SERVERSOCKET, SOL_SOCKET, SO_RCVTIMEO, &t, sizeof(struct timeval));
+
     const auto ARGS = std::count(arg.begin(), arg.end(), ' ');
 
     if (ARGS < minArgs) {
-        log("Not enough arguments, expected at least " + minArgs);
+        log(std::format("Not enough arguments in '{}', expected at least {}", arg, minArgs));
         return -1;
     }
 
@@ -139,6 +180,9 @@ int request(std::string arg, int minArgs = 0) {
         return 4;
     }
 
+    if (needRoll)
+        return rollingRead(SERVERSOCKET);
+
     std::string reply        = "";
     char        buffer[8192] = {0};
 
@@ -288,6 +332,7 @@ int main(int argc, char** argv) {
     std::string fullArgs         = "";
     const auto  ARGS             = splitArgs(argc, argv);
     bool        json             = false;
+    bool        needRoll         = false;
     std::string overrideInstance = "";
 
     for (std::size_t i = 0; i < ARGS.size(); ++i) {
@@ -307,6 +352,9 @@ int main(int argc, char** argv) {
                 fullArgs += "a";
             } else if ((ARGS[i] == "-c" || ARGS[i] == "--config") && !fullArgs.contains("c")) {
                 fullArgs += "c";
+            } else if ((ARGS[i] == "-f" || ARGS[i] == "--follow") && !fullArgs.contains("f")) {
+                fullArgs += "f";
+                needRoll = true;
             } else if (ARGS[i] == "--batch") {
                 fullRequest = "--batch ";
             } else if (ARGS[i] == "--instance" || ARGS[i] == "-i") {
@@ -366,6 +414,11 @@ int main(int argc, char** argv) {
         return 0;
     }
 
+    if (needRoll && !fullRequest.contains("/rollinglog")) {
+        log("only 'rollinglog' command supports '--follow' option");
+        return 1;
+    }
+
     if (overrideInstance.contains("_"))
         instanceSignature = overrideInstance;
     else if (!overrideInstance.empty()) {
@@ -425,6 +478,8 @@ int main(int argc, char** argv) {
         exitStatus = request(fullRequest, 1);
     else if (fullRequest.contains("/--help"))
         std::cout << USAGE << std::endl;
+    else if (fullRequest.contains("/rollinglog") && needRoll)
+        exitStatus = request(fullRequest, 0, true);
     else {
         exitStatus = request(fullRequest);
     }

src/debug/HyprCtl.cpp

@@ -24,6 +24,7 @@
 #include "../devices/IKeyboard.hpp"
 #include "../devices/ITouch.hpp"
 #include "../devices/Tablet.hpp"
+#include "debug/RollingLogFollow.hpp"
 #include "config/ConfigManager.hpp"
 
 static void trimTrailingComma(std::string& str) {
@@ -1723,6 +1724,46 @@ std::string CHyprCtl::makeDynamicCall(const std::string& input) {
     return getReply(input);
 }
 
+bool successWrite(int fd, const std::string& data, bool needLog = true) {
+    if (write(fd, data.c_str(), data.length()) > 0)
+        return true;
+
+    if (errno == EAGAIN)
+        return true;
+
+    if (needLog)
+        Debug::log(ERR, "Couldn't write to socket. Error: " + std::string(strerror(errno)));
+
+    return false;
+}
+
+void runWritingDebugLogThread(const int conn) {
+    using namespace std::chrono_literals;
+    Debug::log(LOG, "In followlog thread, got connection, start writing: {}", conn);
+    //will be finished, when reading side close connection
+    std::thread([conn]() {
+        while (Debug::RollingLogFollow::Get().IsRunning()) {
+            if (Debug::RollingLogFollow::Get().isEmpty(conn)) {
+                std::this_thread::sleep_for(1000ms);
+                continue;
+            }
+
+            auto line = Debug::RollingLogFollow::Get().GetLog(conn);
+            if (!successWrite(conn, line))
+                // We cannot write, when connection is closed. So thread will successfully exit by itself
+                break;
+
+            std::this_thread::sleep_for(100ms);
+        }
+        close(conn);
+        Debug::RollingLogFollow::Get().StopFor(conn);
+    }).detach();
+}
+
+bool isFollowUpRollingLogRequest(const std::string& request) {
+    return request.contains("rollinglog") && request.contains("f");
+}
+
 int hyprCtlFDTick(int fd, uint32_t mask, void* data) {
     if (mask & WL_EVENT_ERROR || mask & WL_EVENT_HANGUP)
         return 0;
@@ -1766,9 +1807,15 @@ int hyprCtlFDTick(int fd, uint32_t mask, void* data) {
         reply = "Err: " + std::string(e.what());
     }
 
-    write(ACCEPTEDCONNECTION, reply.c_str(), reply.length());
+    successWrite(ACCEPTEDCONNECTION, reply);
 
-    close(ACCEPTEDCONNECTION);
+    if (isFollowUpRollingLogRequest(request)) {
+        Debug::log(LOG, "Followup rollinglog request received. Starting thread to write to socket.");
+        Debug::RollingLogFollow::Get().StartFor(ACCEPTEDCONNECTION);
+        runWritingDebugLogThread(ACCEPTEDCONNECTION);
+        Debug::log(LOG, Debug::RollingLogFollow::Get().DebugInfo());
+    } else
+        close(ACCEPTEDCONNECTION);
 
     if (g_pConfigManager->m_bWantsMonitorReload)
         g_pConfigManager->ensureMonitorStatus();

src/debug/Log.cpp

@@ -1,6 +1,7 @@
 #include "Log.hpp"
 #include "../defines.hpp"
 #include "../Compositor.hpp"
+#include "RollingLogFollow.hpp"
 
 #include <fstream>
 #include <iostream>
@@ -73,6 +74,9 @@ void Debug::log(LogLevel level, std::string str) {
     if (rollingLog.size() > ROLLING_LOG_SIZE)
         rollingLog = rollingLog.substr(rollingLog.size() - ROLLING_LOG_SIZE);
 
+    if (RollingLogFollow::Get().IsRunning())
+        RollingLogFollow::Get().AddLog(str);
+
     if (!disableLogs || !**disableLogs) {
         // log to a file
         std::ofstream ofs;

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;
+        };
+    };
+}