11-21-2017
This is very vague a request, so the answers can't be more than vague as well.
In *nix systems, logging via syslog is an essential part of the system and is also offered as a service to user programs. Any application worth its disk space let alone the money paid for it does logging, the depth, frequency, and details of which often are configurable.
For more and more precise info, you need to supply more details.
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LEARN ABOUT DEBIAN
plack::middleware::conditional
Plack::Middleware::Conditional(3pm) User Contributed Perl Documentation Plack::Middleware::Conditional(3pm)
NAME
Plack::Middleware::Conditional - Conditional wrapper for Plack middleware
SYNOPSIS
use Plack::Builder;
builder {
enable_if { $_[0]->{REMOTE_ADDR} eq '127.0.0.1' } 'StackTrace', force => 1;
$app;
};
# or using the OO interface:
$app = Plack::Middleware::Conditional->wrap(
$app,
condition => sub { $_[0]->{REMOTE_ADDR} eq '127.0.0.1' },
builder => sub { Plack::Middleware::StackTrace->wrap($_[0], force => 1) },
);
DESCRIPTION
Plack::Middleware::Conditional is a piece of meta-middleware, to run a specific middleware component under runtime conditions. The goal of
this middleware is to avoid baking runtime configuration options in individual middleware components, and rather share them as another
middleware component.
EXAMPLES
Note that some of the middleware component names are just made up for the explanation and might not exist.
# Minify JavaScript if the browser is Firefox
enable_if { $_[0]->{HTTP_USER_AGENT} =~ /Firefox/ } 'JavaScriptMinifier';
# Enable Stacktrace when being accessed from the local network
enable_if { $_[0]->{REMOTE_ADDR} =~ /^10.0.1.*/ } 'StackTrace';
# Work with other conditional setter middleware:
# Transcode Jpeg on the fly for mobile clients
builder {
enable 'MobileDetector';
enable_if { $_[0]->{'plack.mobile_detected'} }
'TranscodeJpeg', max_size => 30_000;
$app;
};
Note that in the last example MobileDetector should come first because the conditional check runs in pre-run conditions, which is from
outer to inner: that is, from the top to the bottom in the Builder DSL code.
AUTHOR
Tatsuhiko Miyagawa
Steve Cook
SEE ALSO
Plack::Builder
perl v5.14.2 2012-04-14 Plack::Middleware::Conditional(3pm)