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, 4 insertions, 0 deletions

diff --git a/src/zenserver/diag/logging.cpp b/src/zenserver/diag/logging.cpp
index e2d57b840..dc1675819 100644
--- a/src/zenserver/diag/logging.cpp
+++ b/src/zenserver/diag/logging.cpp
@@ -42,6 +42,7 @@ InitializeServerLogging(const ZenServerOptions& InOptions)
 																	   /* max files */ 16,
 																	   /* rotate on open */ true);
 	auto HttpLogger = std::make_shared<spdlog::logger>("http_requests", HttpSink);
+	spdlog::apply_logger_env_levels(HttpLogger);
 	spdlog::register_logger(HttpLogger);
 
 	// Cache request logging
@@ -53,16 +54,19 @@ InitializeServerLogging(const ZenServerOptions& InOptions)
 																		/* max files */ 16,
 																		/* rotate on open */ false);
 	auto CacheLogger = std::make_shared<spdlog::logger>("z$", CacheSink);
+	spdlog::apply_logger_env_levels(CacheLogger);
 	spdlog::register_logger(CacheLogger);
 
 	// Jupiter - only log upstream HTTP traffic to file
 
 	auto JupiterLogger = std::make_shared<spdlog::logger>("jupiter", FileSink);
+	spdlog::apply_logger_env_levels(JupiterLogger);
 	spdlog::register_logger(JupiterLogger);
 
 	// Zen - only log upstream HTTP traffic to file
 
 	auto ZenClientLogger = std::make_shared<spdlog::logger>("zenclient", FileSink);
+	spdlog::apply_logger_env_levels(ZenClientLogger);
 	spdlog::register_logger(ZenClientLogger);
 
 	FinishInitializeLogging(LogOptions);