[pgrouting-dev] New logger for C/C++ for pgrouting

[Stephen Woodbridge]

Hi Devs,

Update the pgr_logger.h and added PGR_ prefix to all the macros to avoid 
potential confusion. I also updated the vrp_basic cpp code to use the 
new logging facility.

Here is the updated documentation:

     USAGE:

     #define PGR_LOGGERR_ON
     #undef PGR_LOGGER_ON  // turn off logging for production

     // override the default log file "/tmp/pgr_logger.log"
     #define PGR_LOGGER_FILE "mylogger.log"

     #undef PGR_LOGGER_LOC  // dont log filename and line number
     #define PGR_LOGGER_LOC  // log filename and line number with log 
message

     // include the logger macros and configure based on defines above
     #include pgr_logger.h

     // log a message to the log file
     PGR_LOGF(format, args);
     PGR_LOGF("%s at %d\n", "this is a message", time());
     PGR_LOG("just print a string to the log");

     This will log something like:

     myfile.cpp:123: this is a message at 1399216875
     myfile.cpp:124: just print a string to the log

-Steve

On 5/4/2014 2:06 PM, Stephen Woodbridge wrote:
> Hi Devs,
>
> I have created a new very simple header file at:
>
> pgrouting/src/common/src/pgr_logger.h
>
> The goal for this is to provide a consistent way for adding debug
> messages to the C/C++ that get directed to a log file. There is a define
> that can be used to globally disable the logging on a per file basis.
>
> I looked at a lot of other loggers for C/C++ but this seems to be good
> for our modest needs and it is easy to disable when we are ready to
> deploy it.
>
> Let me know you thoughts and please use it for the C++ code. You can
> also use this for the C code, but most of the C code already is using
> postgresql elog() function to send NOTICE statements back to the client.
>
> Thanks,
>    -Steve
>
> READ the header file it has documentation in it.
>
>      USAGE:
>
>      #define LOGGERR_ON
>      #undef LOGGER_ON  // turn off logging for production
>
>      // override the default log file "/tmp/pgr_logger.log"
>      #define LOGGER_FILE "mylogger.log"
>
>      #undef LOGGER_LOC  // dont log filename and line number
>      #define LOGGER_LOC  // log filename and line number with log message
>
>      // include the logger macros and configure based on defines above
>      #include pgr_logger.h
>
>      // log a message to the log file
>      LOG(format, args)
>      LOG("%s at %d\n", "this is a message", time())
>
>      This will log something like:
>
>      myfile:123: this is a message at 1399216875
>
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