From e195e51c1bd4b17398ec6964f30751b6a54bbb44 Mon Sep 17 00:00:00 2001
From: Vaxry <vaxry@vaxry.net>
Date: Tue, 14 Nov 2023 20:06:04 +0000
Subject: logging: move to an internal rolling log buffer

disables logging to the logfile by default
---
 src/debug/Log.hpp | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

(limited to 'src/debug/Log.hpp')

diff --git a/src/debug/Log.hpp b/src/debug/Log.hpp
index 085465c9..659e2db4 100644
--- a/src/debug/Log.hpp
+++ b/src/debug/Log.hpp
@@ -7,9 +7,11 @@
 #include "../includes.hpp"
 #include "../helpers/MiscFunctions.hpp"
 
-#define LOGMESSAGESIZE 1024
+#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...));
 
-        ofs << logMsg << "\n";
+        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();
+            ofs.close();
+        }
 
         // log it to the stdout too.
         if (!disableStdout)
-- 
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