Add option to log synchronously, add tooltip to log filter.

src/common/logging/backend.cpp

@@ -4,6 +4,7 @@
 #include <atomic>
 #include <chrono>
 #include <climits>
+#include <mutex>
 #include <thread>
 
 #include <fmt/format.h>
@@ -231,8 +232,15 @@ public:
         if (!filter.CheckMessage(log_class, log_level)) {
             return;
         }
-        message_queue.EmplaceWait(
-            CreateEntry(log_class, log_level, filename, line_num, function, std::move(message)));
+
+        auto entry =
+            CreateEntry(log_class, log_level, filename, line_num, function, std::move(message));
+        if (Settings::values.log_async) {
+            message_queue.EmplaceWait(entry);
+        } else {
+            std::scoped_lock l{sync_mutex};
+            ForEachBackend([&entry](Backend& backend) { backend.Write(entry); });
+        }
     }
 
 private:
@@ -313,6 +321,7 @@ private:
 #endif
 
     MPSCQueue<Entry> message_queue{};
+    std::mutex sync_mutex;
     std::chrono::steady_clock::time_point time_origin{std::chrono::steady_clock::now()};
     std::jthread backend_thread;
 };
@@ -345,9 +354,11 @@ void SetColorConsoleBackendEnabled(bool enabled) {
 void FmtLogMessageImpl(Class log_class, Level log_level, const char* filename,
                        unsigned int line_num, const char* function, fmt::string_view format,
                        const fmt::format_args& args) {
-    if (!initialization_in_progress_suppress_logging) {
-        Impl::Instance().PushEntry(log_class, log_level, filename, line_num, function,
-                                   fmt::vformat(format, args));
+    if (initialization_in_progress_suppress_logging) {
+        return;
     }
+
+    Impl::Instance().PushEntry(log_class, log_level, filename, line_num, function,
+                               fmt::vformat(format, args));
 }
 } // namespace Common::Log

src/common/logging/filter.cpp

@@ -171,6 +171,7 @@ const char* GetLogClassName(Class log_class) {
 #define SUB(x, y)                                                                                  \
     case Class::x##_##y:                                                                           \
         return #x "." #y;
+//        return #x "_" #y;
         ALL_LOG_CLASSES()
 #undef CLS
 #undef SUB

src/common/settings.h

@@ -604,6 +604,7 @@ struct Values {
 
     // Miscellaneous
     Setting<std::string> log_filter{linkage, "*:Info", "log_filter", Category::Miscellaneous};
+    Setting<bool> log_async{linkage, true, "log_async", Category::Miscellaneous};
     Setting<bool> use_dev_keys{linkage, false, "use_dev_keys", Category::Miscellaneous};
 
     // Network