add tmp buffer to store messages until the log file is ready

src/log.cpp

@@ -74,35 +74,51 @@ void LogRemote::net_close()
 }
 void LogRemote::file_init()
 {
+    std::lock_guard<std::mutex> _lock(m_mutex);
     if (!m_logfile.is_open())
         m_logfile.open(App::I->data_path + "/panopainter-log.txt");
+    if (m_logfile.is_open() && !m_tmp.empty())
+    {
+        for (auto const& s : m_tmp)
+            m_logfile.write(s.data(), s.size());
+        m_logfile.flush();
+        m_tmp.clear();
+    }
 }
 void LogRemote::file_close()
 {
+    std::lock_guard<std::mutex> _lock(m_mutex);
     if (!m_logfile.is_open())
         m_logfile.close();
 }
 void LogRemote::log(const char* format, ...)
 {
+    std::lock_guard<std::mutex> _lock(m_mutex);
     static char buffer[4096];
     va_list arglist;
     va_start(arglist, format);
     int n = vsnprintf(buffer, sizeof(buffer), format, arglist);
     va_end(arglist);
     m_mq.Post(std::string(buffer, n));
+    auto line = std::string(buffer, n) + "\n";
     if (m_logfile.is_open())
     {
-        auto line = std::string(buffer, n) + "\n";
         m_logfile.write(line.data(), line.size());
         m_logfile.flush();
     }
+    else
+    {
+        m_tmp.push_back(line);
+    }
 #if _WIN32
-    auto line = "DBG: " + std::string(buffer, n) + "\n";
+    auto line_console = "DBG: " + line;
-    OutputDebugStringA(line.c_str());
+    OutputDebugStringA(line_console.c_str());
 #endif
 }
 void LogRemote::log(const wchar_t* format, ...)
 {
+    std::lock_guard<std::mutex> _lock(m_mutex);
+
     static wchar_t buffer[4096];
     va_list arglist;
     va_start(arglist, format);
@@ -125,15 +141,19 @@ void LogRemote::log(const wchar_t* format, ...)
     //std::string converted_str = converter.to_bytes(string_to_convert);
 
     m_mq.Post(std::string(converted));
+    auto line = converted + "\n";
     if (m_logfile.is_open())
     {
-        auto line = converted + "\n";
         m_logfile.write(line.data(), line.size());
         m_logfile.flush();
     }
+    else
+    {
+        m_tmp.push_back(line);
+    }
 #if _WIN32
-    auto line = L"DBG: " + std::wstring(buffer, n) + L"\n";
+    auto line_console = L"DBG: " + std::wstring(buffer, n) + L"\n";
-    OutputDebugStringW(line.c_str());
+    OutputDebugStringW(line_console.c_str());
 #endif
 }
 LogRemote::~LogRemote()

src/log.h

@@ -17,7 +17,10 @@ public:
     bool m_running = false;
     bool m_error = false;
     std::thread m_thread;
+    std::mutex m_mutex;
     BlockingQueue<std::string> m_mq;
+    // Store messages until the file is open
+    std::vector<std::string> m_tmp;
     CURL *curl = nullptr;
     CURLcode res;
     std::string readBuffer;