man ZoneMinder::Logger (3): ZoneMinder Logger module

SYNOPSIS

use ZoneMinder::Logger;
use ZoneMinder::Logger qw(:all);
logInit( "myproc", DEBUG );
Debug( "This is what is happening" );
Info( "Something interesting is happening" );
Warning( "Something might be going wrong." );
Error( "Something has gone wrong!!" );
Fatal( "Something has gone badly wrong, gotta stop!!" );
Panic( "Something fundamental has gone wrong, die with stack trace );

DESCRIPTION

The ZoneMinder:Logger module contains the common debug and error reporting routines used by the ZoneMinder scripts.

To use debug in your scripts you need to include this module, and call logInit. Thereafter you can sprinkle Debug or Error calls etc throughout the code safe in the knowledge that they will be reported to your error log, and possibly the syslogger, in a meaningful and consistent format.

Debug is discussed in terms of levels where 1 and above (currently only 1 for scripts) is considered debug, 0 is considered as informational, -1 is a warning, -2 is an error and -3 is a fatal error or panic. Where levels are mentioned below as thresholds the value given and anything with a lower level (ie. more serious) will be included.

METHODS

logInit ( $id, %options );

Initialises the debug and prepares the logging for forthcoming operations. If not called explicitly it will be called by the first debug call in your script, but with default (and probably meaningless) options. The only compulsory arguments are $id which must be a string that will identify debug coming from this script in mixed logs. Other options may be provided as below,

 Option        Default        Description
 ---------     ---------      -----------
 level         INFO       The initial debug level which defines which statements are output and which are ignored
 trace         0          Whether to use the Carp::shortmess format in debug statements to identify where the debug was emitted from
 termLevel     NOLOG      At what level debug is written to terminal standard error, 0 is no, 1 is yes, 2 is write only if terminal
 databaseLevel INFO       At what level debug is written to the Log table in the database;
 fileLevel     NOLOG      At what level debug is written to a log file of the format of <id>.log in the standard log directory.
 syslogLevel   INFO       At what level debug is written to syslog.

To disable any of these action entirely set to NOLOG

logTerm ();

Used to end the debug session and close any logs etc. Not usually necessary.

$id = logId ( [$id] );

$level = logLevel ( [$level] );

$trace = logTrace ( [$trace] );

$level = logLevel ( [$level] );

$termLevel = logTermLevel ( [$termLevel] );

$databaseLevel = logDatabaseLevel ( [$databaseLevel] );

$fileLevel = logFileLevel ( [$fileLevel] );

$syslogLevel = logSyslogLevel ( [$syslogLevel] );

These methods can be used to get and set the current settings as defined in logInit.

Debug( $string );

This method will output a debug message if the current debug level permits it, otherwise does nothing. This message will be tagged with the DBG string in the logs.

Info( $string );

This method will output an informational message if the current debug level permits it, otherwise does nothing. This message will be tagged with the INF string in the logs.

Warning( $string );

This method will output a warning message if the current debug level permits it, otherwise does nothing. This message will be tagged with the WAR string in the logs.

Error( $string );

This method will output an error message if the current debug level permits it, otherwise does nothing. This message will be tagged with the ERR string in the logs.

Fatal( $string );

This method will output a fatal error message and then die if the current debug level permits it, otherwise does nothing. This message will be tagged with the FAT string in the logs.

Panic( $string );

This method will output a panic error message and then die with a stack trace if the current debug level permits it, otherwise does nothing. This message will be tagged with the PNC string in the logs.

EXPORT

None by default. The :constants tag will export the debug constants which define the various levels of debug The :variables tag will export variables containing the current debug id and level The :functions tag will export the debug functions. This or :all is what you would normally use. The :all tag will export all above symbols.

AUTHOR

Philip Coombes, <[email protected]>

COPYRIGHT AND LICENSE