Core/Log: Allow configuring a maximum file size for a log file. If the file size is about to be exceeded, the core will create a new file titled <oldname>_.log and start outputting there.

src/server/shared/Logging/Appender.h

@@ -123,6 +123,12 @@ struct LogMessage
     std::string prefix;
     std::string param1;
     time_t mtime;
+
+    ///@ Returns size of the log message content in bytes
+    uint32 Size() const
+    {
+        return prefix.size() + text.size();
+    }
 };
 
 class Appender

src/server/shared/Logging/AppenderFile.cpp

@@ -18,11 +18,12 @@
 #include "AppenderFile.h"
 #include "Common.h"
 
-AppenderFile::AppenderFile(uint8 id, std::string const& name, LogLevel level, const char* _filename, const char* _logDir, const char* _mode, AppenderFlags _flags)
+AppenderFile::AppenderFile(uint8 id, std::string const& name, LogLevel level, const char* _filename, const char* _logDir, const char* _mode, AppenderFlags _flags, uint64 fileSize)
     : Appender(id, name, APPENDER_FILE, level, _flags)
     , filename(_filename)
     , logDir(_logDir)
     , mode(_mode)
+    , _fileSize(fileSize)
 {
     dynamicName = std::string::npos != filename.find("%s");
     backup = _flags & APPENDER_FLAGS_MAKE_FILE_BACKUP;
@@ -46,12 +47,25 @@ void AppenderFile::_write(LogMessage const& message)
         char namebuf[TRINITY_PATH_MAX];
         snprintf(namebuf, TRINITY_PATH_MAX, filename.c_str(), message.param1.c_str());
         logfile = OpenFile(namebuf, mode, backup);
+        _fileSize = ftell(logfile);
     }
 
     if (logfile)
     {
+        if (!dynamicName && _fileSize + message.Size() > _maxFileSize)
+        {
+            /** @ We assume all log files have a .log extension.
+             If file "gol.log" is at its max capacity, this will spawn a new file, "gol_.log". If that one reaches capacity, it'll spawn "gol__.log", etc.
+            */
+            filename.replace(filename.end() - 3, filename.end(), "_.log");
+            logfile = OpenFile(filename.c_str(), mode, backup);
+            _write(message);
+            return;
+        }
+
         fprintf(logfile, "%s%s", message.prefix.c_str(), message.text.c_str());
         fflush(logfile);
+        _fileSize += message.Size();
 
         if (dynamicName)
         {
@@ -71,5 +85,7 @@ FILE* AppenderFile::OpenFile(std::string const &filename, std::string const &mod
         rename(filename.c_str(), newName.c_str()); // no error handling... if we couldn't make a backup, just ignore
     }
 
-    return fopen((logDir + filename).c_str(), mode.c_str());
+    FILE* ret = fopen((logDir + filename).c_str(), mode.c_str());
+    _fileSize = ftell(ret);
+    return ret;
 }

src/server/shared/Logging/AppenderFile.h

@@ -23,7 +23,7 @@
 class AppenderFile: public Appender
 {
     public:
-        AppenderFile(uint8 _id, std::string const& _name, LogLevel level, const char* filename, const char* logDir, const char* mode, AppenderFlags flags);
+        AppenderFile(uint8 _id, std::string const& _name, LogLevel level, const char* filename, const char* logDir, const char* mode, AppenderFlags flags, uint64 maxSize);
         ~AppenderFile();
         FILE* OpenFile(std::string const& _name, std::string const& _mode, bool _backup);
 
@@ -35,6 +35,8 @@ class AppenderFile: public Appender
         std::string mode;
         bool dynamicName;
         bool backup;
+        uint64 _maxFileSize;
+        uint64 _fileSize;
 };
 
 #endif

src/server/shared/Logging/Log.cpp

@@ -145,8 +145,15 @@ void Log::CreateAppenderFromConfig(const char* name)
                     filename += m_logsTimestamp;
             }
 
+            uint64 maxFileSize = 0;
+            if (++iter != tokens.end())
+            {
+                char const* c = *iter;
+                maxFileSize = atoi(c);
+            }
+
             uint8 id = NextAppenderId();
-            appenders[id] = new AppenderFile(id, name, level, filename.c_str(), m_logsDir.c_str(), mode.c_str(), flags);
+            appenders[id] = new AppenderFile(id, name, level, filename.c_str(), m_logsDir.c_str(), mode.c_str(), flags, maxFileSize);
             //fprintf(stdout, "Log::CreateAppenderFromConfig: Created Appender %s (%u), Type FILE, Mask %u, File %s, Mode %s\n", name, id, level, filename.c_str(), mode.c_str()); // DEBUG - RemoveMe
             break;
         }

src/server/worldserver/worldserver.conf.dist

@@ -2661,7 +2661,7 @@ PlayerDump.DisallowOverwrite = 1
 #  Appender config values: Given a appender "name"
 #    Appender.name
 #        Description: Defines 'where to log'
-#        Format:      Type,LogLevel,Flags,optional1,optional2
+#        Format:      Type,LogLevel,Flags,optional1,optional2,optional3
 #
 #                     Type
 #                         0 - (None)
@@ -2712,6 +2712,13 @@ PlayerDump.DisallowOverwrite = 1
 #                          a - (Append)
 #                          w - (Overwrite)
 #
+#                     MaxFileSize: Maximum file size of the log file before creating a new log file
+#                     (read as optional3 if Type = File)
+#                         Size is measured in bytes expressed in a 64-bit unsigned integer.
+#                         Maximum value is 4294967295 (4 gb). Leave blank for no limit.
+#                         NOTE: Does not work with dynamic filenames.
+#                         Example:  536870912 (512 mb)
+#                          
 
 Appender.Console=1,3,0
 Appender.Server=2,2,0,Server.log,w