[racket-dev] Request for max-log-level

We've added this function as `log-max-level'.

(Also, I tried to fix the instructions in "schminc.h".)

At Thu, 16 Feb 2012 14:53:33 +0100, Tobias Hammer wrote:
> Hi,
> 
> i have to synchronize the log levels of a racket logger and an external  
> logging
> system. Therefore i need the information what the highest logging level of  
> a
> logger is to already discard any messages in the external system that have  
> no
> receiver.
> Because there is, as far as i know, no possibility to get a notification  
> whenever
> the internal accepted level changes i have to synchronize pretty often.  
> This is
> currently only possible by cycling through all levels and check via  
> log-level?
> which is cumbersome and, at least for my needs, too slow.
> Would it be possible to add a function that returns the current maximum  
> level of
> a logger? The needed information is already stored in  
> Scheme_Logger::want_level
> but there is no accessor. The following addition (excl. function  
> registration)
> to error.c would do the job:
> 
> static Scheme_Object *
> max_log_level(int argc, Scheme_Object *argv[])
> {
>    Scheme_Logger *logger;
>    Scheme_Object *result;
> 
>    if (!SAME_TYPE(SCHEME_TYPE(argv[0]), scheme_logger_type))
>      scheme_wrong_type("max-log-level", "logger", 0, argc, argv);
>    logger = (Scheme_Logger *)argv[0];
> 
>    if (logger->local_timestamp < *logger->timestamp)
>      update_want_level(logger);
> 
>    switch (logger->want_level)
>    {
>    case SCHEME_LOG_FATAL: result = fatal_symbol; break;
>    case SCHEME_LOG_ERROR: result = error_symbol; break;
>    case SCHEME_LOG_WARNING: result = warning_symbol; break;
>    case SCHEME_LOG_INFO:  result = info_symbol; break;
>    case SCHEME_LOG_DEBUG: result = debug_symbol; break;
>    default: result = scheme_false;
>    }
> 
>    return result;
> }
> 
> (No patch because i completely messed up with compiled startup and  
> expected primitive
> count, even after following instructions in schminc.h :( )
> 
> Tobias