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.\"
.IX Title "Net::CLI::Interact::Logger 3pm"
.TH Net::CLI::Interact::Logger 3pm "2019-07-17" "perl v5.28.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.if n .ad l
.nh
.SH "NAME"
Net::CLI::Interact::Logger \- Per\-instance multi\-target logging, with categories
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& $logger\->log($category, $level, @message);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module implements a generic logging service, based on Log::Dispatch
but with additional options and configuration. Log messages coming from your
application are categorized, and each category can be enabled/disabled
separately and have its own log level (i.e. \f(CW\*(C`emergency\*(C'\fR .. \f(CW\*(C`debug\*(C'\fR). High
resolution timestamps can be added to log messages.
.SH "DEFAULT CONFIGURATION"
.IX Header "DEFAULT CONFIGURATION"
Being based on Log::Dispatch::Config, this logger can have multiple
targets, each configured for independent level thresholds. The overall default
configuration is to print log messages to the screen (console), with a minimum
level of \f(CW\*(C`debug\*(C'\fR. Each category (see below) has its own log level as well.
.PP
Note that categories, as discussed below, are arbitrary so if a category is
not explicitly enabled or disabled, it is assumed to be \fBdisabled\fR. If you
wish to invent a new category for your application, simply think of the name
and begin to use it, with a \f(CW$level\fR and \f(CW@message\fR as above in the
\&\s-1SYNOPSIS.\s0
.SH "INTERFACE"
.IX Header "INTERFACE"
.ie n .SS "log( $category, $level, @message )"
.el .SS "log( \f(CW$category\fP, \f(CW$level\fP, \f(CW@message\fP )"
.IX Subsection "log( $category, $level, @message )"
The combination of category and level determine whether the the log messages
are emitted to any of the log destinations. Destinations are set using the
\&\f(CW\*(C`log_config\*(C'\fR method, and categories are configured using the \f(CW\*(C`log_flags\*(C'\fR
method.
.PP
The \f(CW@message\fR list will be joined by a space character, and a newline
appended if the last message doesn't contain one itself. Messages are
prepended with the first character of their \f(CW$category\fR, and then indented
proportionally to their \f(CW$level\fR.
.SS "log_config( \e%config )"
.IX Subsection "log_config( %config )"
A \f(CW\*(C`Log::Dispatch::Config\*(C'\fR configuration (hash ref), meaning multiple log
targets may be specified with different minimum level thresholds. There is a
default configuration which emits messages to your screen (console) with no
minimum threshold:
.PP
.Vb 7
\& {
\&     dispatchers => [\*(Aqscreen\*(Aq],
\&     screen => {
\&         class => \*(AqLog::Dispatch::Screen\*(Aq,
\&         min_level => \*(Aqdebug\*(Aq,
\&     },
\& };
.Ve
.SS "log_flags( \e@categories | \e%category_level_map )"
.IX Subsection "log_flags( @categories | %category_level_map )"
The user is expected to specify which log categories they are interested in,
and at what levels. If a category is used in the application for logging but
not specified, then it is deemed \fBdisabled\fR. Hence, even though the default
destination log level is \f(CW\*(C`debug\*(C'\fR, no messages are emitted until a category is
enabled.
.PP
In the array reference form, the list should contain category names, and they
will all be mapped to the \f(CW\*(C`error\*(C'\fR level:
.PP
.Vb 6
\& $logger\->log_flags([qw/
\&     network
\&     disk
\&     io
\&     cpu
\& /]);
.Ve
.PP
In the hash reference form, the keys should be category names and the values
log levels from the list below (ordered such that each level \*(L"includes\*(R" the
levels \fIabove\fR):
.PP
.Vb 8
\& emergency
\& alert
\& critical
\& error
\& warning
\& notice
\& info
\& debug
.Ve
.PP
For example:
.PP
.Vb 6
\& $logger\->log_flags({
\&     network => \*(Aqinfo\*(Aq,
\&     disk    => \*(Aqdebug\*(Aq,
\&     io      => \*(Aqcritical\*(Aq,
\&     cpu     => \*(Aqdebug\*(Aq,
\& });
.Ve
.PP
Messages at or above the specified level will be passed on to the
\&\f(CW\*(C`Log::Dispatch\*(C'\fR target, which may then specify an overriding threshold.
.ie n .SS """ Net::CLI::Interact\-""\fBdefault_log_categories()\fP >>"
.el .SS "\f(CW Net::CLI::Interact\-\fP\fBdefault_log_categories()\fP >>"
.IX Subsection " Net::CLI::Interact-default_log_categories() >>"
Not a part of this class, but the only way to retrieve a list of the current
log categories used in the Net::CLI::Interact distribution source. Does not
take into account any log categories added by the user.
.ie n .SS "log_stamp( $boolean )"
.el .SS "log_stamp( \f(CW$boolean\fP )"
.IX Subsection "log_stamp( $boolean )"
Enable (the default) or disable the display of high resolution interval
timestamps with each log message.
.ie n .SS "log_category( $boolean )"
.el .SS "log_category( \f(CW$boolean\fP )"
.IX Subsection "log_category( $boolean )"
Enable (the default) or disable the display of the first letters of the
category name with each log message.
.ie n .SS "log_start( [$seconds, $microseconds] )"
.el .SS "log_start( [$seconds, \f(CW$microseconds\fP] )"
.IX Subsection "log_start( [$seconds, $microseconds] )"
Time of the start for generating a time interval when logging stamps. Defaults
to the result of \f(CW\*(C`Time::HiRes::gettimeofday\*(C'\fR at the point the module is
loaded, in list context.
.ie n .SS "would_log( $category, $level )"
.el .SS "would_log( \f(CW$category\fP, \f(CW$level\fP )"
.IX Subsection "would_log( $category, $level )"
Returns True if, according to the current \f(CW\*(C`log_flags\*(C'\fR, the given \f(CW$category\fR
is enabled at or above the threshold of \f(CW$level\fR, otherwise returns False.
Note that the \f(CW\*(C`Log::Dispatch\*(C'\fR targets maintain their own thresholds as well.