logging: move to an internal rolling log buffer

disables logging to the logfile by default

hyprctl/main.cpp

@@ -396,6 +396,8 @@ int main(int argc, char** argv) {
         request(fullRequest);
     else if (fullRequest.contains("/globalshortcuts"))
         request(fullRequest);
+    else if (fullRequest.contains("/rollinglog"))
+        request(fullRequest);
     else if (fullRequest.contains("/instances"))
         instancesRequest(json);
     else if (fullRequest.contains("/switchxkblayout"))

src/config/ConfigManager.cpp

@@ -145,7 +145,7 @@ void CConfigManager::setDefaultVars() {
     configValues["debug:log_damage"].intValue         = 0;
     configValues["debug:overlay"].intValue            = 0;
     configValues["debug:damage_blink"].intValue       = 0;
-    configValues["debug:disable_logs"].intValue       = 0;
+    configValues["debug:disable_logs"].intValue       = 1;
     configValues["debug:disable_time"].intValue       = 1;
     configValues["debug:enable_stdout_logs"].intValue = 0;
     configValues["debug:damage_tracking"].intValue    = DAMAGE_TRACKING_FULL;

src/debug/CrashReporter.cpp

@@ -119,7 +119,7 @@ void CrashReporter::createAndSaveCrash(int sig) {
 
     finalCrashReport += "\n\nLog tail:\n";
 
-    finalCrashReport += execAndGet(("cat \"" + Debug::logFile + "\" | tail -n 50").c_str());
+    finalCrashReport += Debug::rollingLog;
 
     const auto HOME       = getenv("HOME");
     const auto CACHE_HOME = getenv("XDG_CACHE_HOME");

src/debug/HyprCtl.cpp

@@ -625,6 +625,20 @@ std::string animationsRequest(HyprCtl::eHyprCtlOutputFormat format) {
     return ret;
 }
 
+std::string rollinglogRequest(HyprCtl::eHyprCtlOutputFormat format) {
+    std::string result = "";
+
+    if (format == HyprCtl::FORMAT_JSON) {
+        result += "[\n\"log\":\"";
+        result += escapeJSONStrings(Debug::rollingLog);
+        result += "\"]";
+    } else {
+        result = Debug::rollingLog;
+    }
+
+    return result;
+}
+
 std::string globalShortcutsRequest(HyprCtl::eHyprCtlOutputFormat format) {
     std::string ret       = "";
     const auto  SHORTCUTS = g_pProtocolManager->m_pGlobalShortcutsProtocolManager->getAllShortcuts();
@@ -1351,6 +1365,8 @@ std::string getReply(std::string request) {
         return globalShortcutsRequest(format);
     else if (request == "animations")
         return animationsRequest(format);
+    else if (request == "rollinglog")
+        return rollinglogRequest(format);
     else if (request.starts_with("plugin"))
         return dispatchPlugin(request);
     else if (request.starts_with("notify"))

src/debug/HyprCtl.hpp

@@ -19,7 +19,8 @@ namespace HyprCtl {
 
     inline int              iSocketFD = -1;
 
-    enum eHyprCtlOutputFormat {
+    enum eHyprCtlOutputFormat
+    {
         FORMAT_NORMAL = 0,
         FORMAT_JSON
     };

src/debug/Log.cpp

@@ -10,25 +10,24 @@ void Debug::init(const std::string& IS) {
 }
 
 void Debug::wlrLog(wlr_log_importance level, const char* fmt, va_list args) {
-    if (disableLogs && *disableLogs)
-        return;
-
     if (level > wlr_log_get_verbosity())
         return;
 
     char* outputStr = nullptr;
 
-    std::ofstream ofs;
-    ofs.open(logFile, std::ios::out | std::ios::app);
-
     vasprintf(&outputStr, fmt, args);
 
     std::string output = std::string(outputStr);
     free(outputStr);
 
-    ofs << "[wlr] " << output << "\n";
+    rollingLog += output + "\n";
 
+    if (!disableLogs || !*disableLogs) {
+        std::ofstream ofs;
+        ofs.open(logFile, std::ios::out | std::ios::app);
+        ofs << "[wlr] " << output << "\n";
         ofs.close();
+    }
 
     if (!disableStdout)
         std::cout << output << "\n";

src/debug/Log.hpp

@@ -8,8 +8,10 @@
 #include "../helpers/MiscFunctions.hpp"
 
 #define LOGMESSAGESIZE   1024
+#define ROLLING_LOG_SIZE 4096
 
-enum LogLevel {
+enum LogLevel
+{
     NONE = -1,
     LOG  = 0,
     WARN,
@@ -26,12 +28,11 @@ namespace Debug {
     inline bool        disableStdout = false;
     inline bool        trace         = false;
 
+    inline std::string rollingLog = ""; // rolling log contains the ROLLING_LOG_SIZE tail of the log
+
     void               init(const std::string& IS);
     template <typename... Args>
     void log(LogLevel level, std::format_string<Args...> fmt, Args&&... args) {
-        if (disableLogs && *disableLogs)
-            return;
-
         if (level == TRACE && !trace)
             return;
 
@@ -47,10 +48,6 @@ namespace Debug {
             default: break;
         }
 
-        // log to a file
-        std::ofstream ofs;
-        ofs.open(logFile, std::ios::out | std::ios::app);
-
         // print date and time to the ofs
         if (disableTime && !*disableTime) {
 #ifndef _LIBCPP_VERSION
@@ -69,9 +66,18 @@ namespace Debug {
         // 3. this is actually what std::format in stdlib does
         logMsg += std::vformat(fmt.get(), std::make_format_args(args...));
 
+        rollingLog += logMsg + "\n";
+        if (rollingLog.size() > ROLLING_LOG_SIZE)
+            rollingLog = rollingLog.substr(rollingLog.size() - ROLLING_LOG_SIZE);
+
+        if (!disableLogs || !*disableLogs) {
+            // log to a file
+            std::ofstream ofs;
+            ofs.open(logFile, std::ios::out | std::ios::app);
             ofs << logMsg << "\n";
 
             ofs.close();
+        }
 
         // log it to the stdout too.
         if (!disableStdout)