How to use loggerID?

[mga0]

Hello together, from the readme file I try desperately to extract how to get the loggerID to work. I want to write measurements to a discrete file and I think, loggerID is the thing which will help me. But I don't get it to work from the configuration file and the readme talks about this topic in a few lines only.

What I tried was

 -- loggerID
  * GLOBAL:
       FORMAT               =  "%datetime %msg"
       FILENAME             =  "logs/%datetime{%Y%M%d
 ...

and

* GLOBAL:
-- loggerID
       FORMAT               =  "%datetime %msg"
       FILENAME             =  "logs/%datetime{%Y%M%d
 ...

Using this code:

el::Configurations conf("C:/Users/<absolutePath>/logging.conf");
el::Loggers::addFlag(el::LoggingFlag::FixedTimeFormat);
el::Loggers::addFlag(el::LoggingFlag::AutoSpacing);
el::Loggers::addFlag(el::LoggingFlag::ImmediateFlush);
el::Loggers::reconfigureAllLoggers(conf);
el::Loggers::setDefaultConfigurations(conf, false);
el::Logger* l = el::Loggers::getLogger("loggerID");
l->info("test");
CLOG(INFO, "loggerID") << "test2"; 

But the startup of the project gives this failures:

ASSERTION FAILURE FROM EASYLOGGING++ (LINE: 2831) [*currLevel != Level::Unknown] WITH MESSAGE "Unrecognized severity level []" ASSERTION FAILURE FROM EASYLOGGING++ (LINE: 2832) [currConfig != ConfigurationType::Unknown] WITH MESSAGE "Unrecognized configuration []" ASSERTION FAILURE FROM EASYLOGGING++ (LINE: 2716) [parsedSuccessfully] WITH MESSAGE "Unable to parse configuration line: -- loggerID"

And the test strings are landing in the standard info_log location. How to use loggerID correctly what lets the parse error disappear? Thanks a lot!

[abumq]

have you see https://github.com/easylogging/easyloggingpp/blob/master/samples/STL/multiple-loggers.cpp ?

Can you please provide a compilable minimal sample and not the snippet for me to try to compile and see what's going on :)?

[mga0]

Okay, no I haven't seen this. Thanks, this makes it clearer. Can could you please add a link into the readme.md section, to make the loggerID functionality clearer? I haven't set el::LoggingFlag::MultiLoggerSupport-flag and read the config file before setting the flags. Maybe this changed something.

But anyhow, I still get can parsing error when reading the global.conf. My global.conf looks like

	*GLOBAL:
	   FORMAT               =  "%datetime %msg"
	   FILENAME             =  "logs/%datetime{%Y%M%d_%H%m%s}_log_global.log"
	   ENABLED              =  true
	   TO_FILE              =  true
	   TO_STANDARD_OUTPUT   =  true
	   MILLISECONDS_WIDTH   =  1
	   PERFORMANCE_TRACKING =  true
	   MAX_LOG_FILE_SIZE    =  2097152 ## 2MB - Comment starts with two hashes (##)
	   LOG_FLUSH_THRESHOLD  =  100 ## Flush after every 100 logs
	*DEBUG:
	   FORMAT               = "%datetime{%Y.%M.%d %H:%m:%s:%g} %func %msg"
	   FILENAME             = "logs/%datetime{%Y%M%d_%H%m%s}_log_debug.log"
-- loggerID
   *INFO:
      FORMAT               = "%datetime{%Y.%M.%d %H:%m:%s:%g} %msg %msg" ## write twice to see a difference to loggerID2
      FILENAME             = "logs/%datetime{%Y%M%d_%H%m%s}_log_logger1_info.log" 
-- loggerID2
	*INFO:
		FORMAT               = "%datetime{%Y.%M.%d %H:%m:%s:%g} %msg" ## write twice to see difference
		FILENAME             = "logs/%datetime{%Y%M%d_%H%m%s}_log_logger2_info.log"

and the code which runs is:

main.cpp

#include "SomeClass.hpp"
#include "easyloggingpp\src\easylogging++.h"

#include <conio.h>

INITIALIZE_EASYLOGGINGPP

using namespace std;

int main(int argc, char **argv)
{
	START_EASYLOGGINGPP(argc, argv);
	SomeClass sc = SomeClass()
}

SomeClass.cpp

#define _ELPP_THREAD_SAFE
#include "SomeClass.hpp"

SomeClass::SomeClass()
{
        el::Loggers::addFlag(el::LoggingFlag::MultiLoggerSupport);
	el::Loggers::addFlag(el::LoggingFlag::FixedTimeFormat);
	el::Loggers::addFlag(el::LoggingFlag::AutoSpacing);
	el::Loggers::addFlag(el::LoggingFlag::ImmediateFlush);
	el::Configurations conf("<path>/global.conf");

	el::Loggers::reconfigureAllLoggers(conf);
	el::Loggers::setDefaultConfigurations(conf, false);
	el::Logger* l = el::Loggers::getLogger("loggerID");
	el::Logger* l2 = el::Loggers::getLogger("loggerID2");

	CLOG(INFO, "loggerID") << "test";
	CLOG(INFO, "loggerID2") << "test2";
	CLOG(INFO, "loggerID") << "test";
}

But still during running the test class, I get this message out:

ASSERTION FAILURE FROM EASYLOGGING++ (LINE: 2831) [*currLevel != Level::Unknown] WITH MESSAGE "Unrecognized severity level []" ASSERTION FAILURE FROM EASYLOGGING++ (LINE: 2832) [currConfig != ConfigurationType::Unknown] WITH MESSAGE "Unrecognized configuration []" ASSERTION FAILURE FROM EASYLOGGING++ (LINE: 2716) [parsedSuccessfully] WITH MESSAGE "Unable to parse configuration line: -- default" ASSERTION FAILURE FROM EASYLOGGING++ (LINE: 2832) [currConfig != ConfigurationType::Unknown] WITH MESSAGE "Unrecognized configuration [FILENAME]" ASSERTION FAILURE FROM EASYLOGGING++ (LINE: 2716) [parsedSuccessfully] WITH MESSAGE "Unable to parse configuration line: -- loggerID" ASSERTION FAILURE FROM EASYLOGGING++ (LINE: 2832) [currConfig != ConfigurationType::Unknown] WITH MESSAGE "Unrecognized configuration [FILENAME]" ASSERTION FAILURE FROM EASYLOGGING++ (LINE: 2716) [parsedSuccessfully] WITH MESSAGE "Unable to parse configuration line: -- loggerID2"

And all the messages go into the last defined location 20161130_231728_log_logger2_info.log to the last defined format:

2016.11.30 19:40:21:1 test
2016.11.30 19:40:21:2 test2 2016.11.30 19:40:21:2 test

Have you an idea why the config is not read into two separate configurations? Thanks for your time in advance!

[mga0]

I can see, that the separate loggers exist, but they write both to the same log file pattern, since the -- loggerID can't be parsed, and the last parameter definition of (FILENAME) is taken. How can I fix this?

[easylogging]

I didn't quite understand your requirements. Does this compile for you and works fine?

[mmabluesky]

@mga0 I have the same needs as you, have you solved this problem?

[mga0]

@mmabluesky sorry, I don't remember. It was too long ago.

[yalov]

@mmabluesky it's your turn now, just 2 years :)

@easylogging I think in this issue, we want to configure several loggers (even without levels), that log to different files

-- default
	* GLOBAL:
		FORMAT               =  "%datetime{%Y-%M-%d %H:%m:%s.%g}      %level: %msg"
		FILENAME             =  "log.txt"
		ENABLED              =  true
		TO_FILE              =  true
		TO_STANDARD_OUTPUT   =  true
		SUBSECOND_PRECISION  =  3
		PERFORMANCE_TRACKING =  true
		MAX_LOG_FILE_SIZE    =  268435456 ## 256MB
		LOG_FLUSH_THRESHOLD  =  100 

-- output
	* GLOBAL:
		FORMAT               =  "%datetime{%Y-%M-%d %H:%m:%s.%g}      %msg"
		FILENAME             =  "output.txt"

int main(int argc, char* argv[]) {
    START_EASYLOGGINGPP(argc, argv);

    el::Loggers::addFlag(el::LoggingFlag::MultiLoggerSupport); // Enables support for multiple loggers
    
    el::Loggers::getLogger("default");
    el::Loggers::getLogger("output");

    el::Configurations conf("./easylogging++.conf");

    //el::Loggers::reconfigureAllLoggers(conf);

    CLOG(INFO, "default", "output") << "default and output";
    CLOG(INFO, "output") << "output";
    CLOG(INFO, "default") << "default";

    return 1;

I have commented reconfigureAllLoggers for now, so it just load configuration, and

ASSERTION FAILURE FROM EASYLOGGING++ (LINE: 531) [*currLevel != Level::Unknown] WITH MESSAGE "Unrecognized severity level []"
ASSERTION FAILURE FROM EASYLOGGING++ (LINE: 532) [currConfig != ConfigurationType::Unknown] WITH MESSAGE "Unrecognized configuration []"
ASSERTION FAILURE FROM EASYLOGGING++ (LINE: 424) [parsedSuccessfully] WITH MESSAGE "Unable to parse configuration line: -- default"
ASSERTION FAILURE FROM EASYLOGGING++ (LINE: 532) [currConfig != ConfigurationType::Unknown] WITH MESSAGE "Unrecognized configuration [LOG_FLUSH_THRESHOLD]"
ASSERTION FAILURE FROM EASYLOGGING++ (LINE: 424) [parsedSuccessfully] WITH MESSAGE "Unable to parse configuration line: -- output"

[yalov]

I found: https://github.com/abumq/easyloggingpp/blob/master/README.md#global-configurations

it isn't the el::Configurations, but

    el::Loggers::addFlag(el::LoggingFlag::MultiLoggerSupport); // Enables support for multiple loggers
    el::Loggers::configureFromGlobal("./easylogging++.conf");

    CLOG(INFO, "default", "output") << "default and output";
    CLOG(INFO, "output") << "output";
    CLOG(INFO, "default") << "default";