logging configuration via command line options (#589)

with these changes it is possible to configure loggers on the command line. For instance:

`xmake run zenserver --log-trace=http_requests,http`

will configure the system so that the `http_request` and `http` loggers are set to TRACE level

1 files changed, 77 insertions, 0 deletions

diff --git a/src/zencore/logging.cpp b/src/zencore/logging.cpp
index 025ed4262..0bf07affd 100644
--- a/src/zencore/logging.cpp
+++ b/src/zencore/logging.cpp
@@ -4,10 +4,14 @@
 
 #include <zencore/string.h>
 #include <zencore/testing.h>
+#include <zencore/thread.h>
 
+ZEN_THIRD_PARTY_INCLUDES_START
+#include <spdlog/details/registry.h>
 #include <spdlog/sinks/null_sink.h>
 #include <spdlog/sinks/stdout_color_sinks.h>
 #include <spdlog/spdlog.h>
+ZEN_THIRD_PARTY_INCLUDES_END
 
 #if ZEN_PLATFORM_WINDOWS
 #	pragma section(".zlog$a", read)
@@ -46,6 +50,8 @@ LoggingContext::~LoggingContext()
 {
 }
 
+//////////////////////////////////////////////////////////////////////////
+
 static inline bool
 IsErrorLevel(int LogLevel)
 {
@@ -176,8 +182,77 @@ ToStringView(level::LogLevel Level)
 
 }  // namespace zen::logging::level
 
+//////////////////////////////////////////////////////////////////////////
+
 namespace zen::logging {
 
+RwLock		LogLevelsLock;
+std::string LogLevels[level::LogLevelCount];
+
+void
+ConfigureLogLevels(level::LogLevel Level, std::string_view Loggers)
+{
+	RwLock::ExclusiveLockScope _(LogLevelsLock);
+	LogLevels[Level] = Loggers;
+}
+
+void
+RefreshLogLevels(level::LogLevel* DefaultLevel)
+{
+	spdlog::details::registry::log_levels Levels;
+
+	{
+		RwLock::SharedLockScope _(LogLevelsLock);
+
+		for (int i = 0; i < level::LogLevelCount; ++i)
+		{
+			level::LogLevel CurrentLevel{i};
+
+			std::string_view Spec = LogLevels[i];
+
+			while (!Spec.empty())
+			{
+				std::string LoggerName;
+
+				if (auto CommaPos = Spec.find_first_of(','); CommaPos != std::string_view::npos)
+				{
+					LoggerName = Spec.substr(CommaPos + 1);
+					Spec.remove_prefix(CommaPos + 1);
+				}
+				else
+				{
+					LoggerName = Spec;
+					Spec	   = {};
+				}
+
+				Levels[LoggerName] = to_spdlog_level(CurrentLevel);
+			}
+		}
+	}
+
+	if (DefaultLevel)
+	{
+		spdlog::level::level_enum SpdDefaultLevel = to_spdlog_level(*DefaultLevel);
+		spdlog::details::registry::instance().set_levels(Levels, &SpdDefaultLevel);
+	}
+	else
+	{
+		spdlog::details::registry::instance().set_levels(Levels, nullptr);
+	}
+}
+
+void
+RefreshLogLevels(level::LogLevel DefaultLevel)
+{
+	RefreshLogLevels(&DefaultLevel);
+}
+
+void
+RefreshLogLevels()
+{
+	RefreshLogLevels(nullptr);
+}
+
 void
 SetLogLevel(level::LogLevel NewLogLevel)
 {
@@ -240,6 +315,7 @@ Get(std::string_view Name)
 	if (!Logger)
 	{
 		Logger = Default().SpdLogger->clone(std::string(Name));
+		spdlog::apply_logger_env_levels(Logger);
 		spdlog::register_logger(Logger);
 	}
 
@@ -262,6 +338,7 @@ ConsoleLog()
 		if (!ConLogger)
 		{
 			ConLogger = spdlog::stdout_color_mt("console");
+			spdlog::apply_logger_env_levels(ConLogger);
 
 			ConLogger->set_pattern("%v");
 		}