Implemented logRotation function

src/main/CommandHandler.cpp

@@ -463,6 +463,7 @@ void
 CommandHandler::logRotate(std::string const& params, std::string& retStr)
 {
     retStr = "Log rotate...";
+    Logging::rotateLogFile();
 }
 
 void

src/util/Logging.cpp

@@ -19,6 +19,7 @@
 namespace stellar
 {
 el::Configurations Logging::gDefaultConf;
+int32_t Logging::logFileIndex;
 
 void
 Logging::setFmt(std::string const& peerID, bool timestamps)
@@ -60,7 +61,10 @@ Logging::init()
     gDefaultConf.setToDefault();
     gDefaultConf.setGlobally(el::ConfigurationType::ToStandardOutput, "true");
     gDefaultConf.setGlobally(el::ConfigurationType::ToFile, "false");
+    gDefaultConf.setGlobally(el::ConfigurationType::MaxLogFileSize, "1");
     setFmt("<startup>");
+    logFileIndex = 0;
+    el::Helpers::installPreRollOutCallback(rolloutHandler);
 }
 
 void
@@ -71,6 +75,22 @@ Logging::setLoggingToFile(std::string const& filename)
     el::Loggers::reconfigureAllLoggers(gDefaultConf);
 }
 
+void
+Logging::rolloutHandler(const char* filename, std::size_t size) {
+    // size is there to match easylogging++ library template
+    std::stringstream ss;
+    ss << "mv " << filename << " " << filename << "." << ++logFileIndex;
+    system(ss.str().c_str());
+    el::Loggers::removeFlag(el::LoggingFlag::StrictLogFileSizeCheck);
+}
+
+
+void
+Logging::rotateLogFile()
+{
+    el::Loggers::addFlag(el::LoggingFlag::StrictLogFileSizeCheck);
+}
+
 el::Level
 Logging::getLogLevel(std::string const& partition)
 {

src/util/Logging.h

@@ -17,11 +17,14 @@ namespace stellar
 class Logging
 {
     static el::Configurations gDefaultConf;
+    static int32_t logFileIndex;
 
   public:
     static void init();
     static void setFmt(std::string const& peerID, bool timestamps = true);
     static void setLoggingToFile(std::string const& filename);
+    static void rotateLogFile();
+    static void rolloutHandler(const char* filename, std::size_t size);
     static void setLogLevel(el::Level level, const char* partition);
     static el::Level getLLfromString(std::string const& levelName);
     static el::Level getLogLevel(std::string const& partition);