SYNOPSIS

use Plack::Builder;

my $app = sub {
    my $env = shift;
    my $time_zone = $env->{'plack.cerberus'}{tz}{name};
    ...
};

builder {
    enable 'Cerberus', servers => 'http://localhost:5001/';
    $app;
};

DESCRIPTION

Plack::Middleware::Cerberus adds metadata from an App::Cerberus server to the $env as $env->{'plack.cerberus'}.

For instance:

• Geo-location

• Time zone

• User-agent info

• Are they a spider?

• Are they making too many requests? Should we throttle them?

It can also be configured to throttle or ban IP address ranges with App::Cerberus::Plugin::Throttle.

CONFIG

The basic configuration (servers and timeout) are passed to "new()" in App::Cerberus::Client.

enable 'Cerberus',
    servers  => 'http://localhost:5001/',
    timeout  => 0.1;

Or

enable 'Cerberus',
    servers  => [ 'http://host1:5001/', 'http://host2:5001/']
    timeout  => 0.1;

If you are using the App::Cerberus::Plugin::Throttle plugin, then you can also configure:

enable 'Cerberus',
    servers => 'http://localhost:5001/',
    enforce => 1,
    log_as  => 'warn';

If log_as is one of debug, info, warn, error or fatal, then Throttle messages will be logged at that level. It defaults to warn. If no logger is configured, then log_as is ignored and it always warns.

If enforce is true, then banned IP addresses will receive a 403 Forbidden response and throttled users a 503 Service Unavailable response, with a Retry-After: $seconds header.

ACCESSING CERBERUS INFO

The $env variable will contain a key 'plack.cerberus' with any data that App::Cerberus has returned, for instance:

my $app = sub {
    my $env        = shift;
    my $geo_info   = $env->{'plack.cerberus'}{geo};
    my $time_zone  = $env->{'plack.cerberus'}{tz};
    my $user_agent = $env->{'plack.cerberus'}{ua};
    my $throttle   = $env->{'plack.cerberus'}{throttle};
};

SEE ALSO

• App::Cerberus

• Dancer::Plugin::Cerberus

SUPPORT

You can find documentation for this module with the perldoc command.

perldoc Plack::Middleware::Cerberus

You can also look for information at:

• GitHub

  http://github.com/clintongormley/Plack-Middleware-Cerberus

• CPAN Ratings

  http://cpanratings.perl.org/d/Plack-Middleware-Cerberus

• Search MetaCPAN

  https://metacpan.org/module/Plack::Middleware::Cerberus