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Anton Gerasimov

NAME

Plack::Middleware::Throttle::Lite::Backend::Abstract - Base class for Throttle::Lite backends

VERSION

version 0.05

DESCRIPTION

This class is provided as a base class for each storage backend. Any backend must inherit from it and provide a set of methods described below.

ABSTRACT METHODS

init

Method invoked after object created. Might be used for initialize connections, setting up values in accessors (see "mk_attrs") and so on.

reqs_done

This one should return total proceeded requests for current key (available via method "cache_key"). If no requests done it should return 0.

increment

This method should increment total proceeded requests by one for current key.

METHODS

mk_attrs

Allows to create a list of attributes (accessors) in the backend package. Basic usage is

    package My::Backend::Foo;

    use parent 'Plack::Middleware::Throttle::Lite::Backend::Abstract';
    __PACKAGE__->mk_attrs(qw(foo bar baz));

Warning! You should be careful in picking attributes' names.

cache_key

Unique requester's identifier. Used to store number of requests. Basically it's a string contains

    throttle:$REMOTE_ADDR:$REMOTE_USER:$INTERVAL

where

$REMOTE_ADDR

A value of the $ENV{REMOTE_ADDR} (e.g. 127.0.0.1).

$REMOTE_USER

A value of the $ENV{REMOTE_USER}. If this environment variable is not set, value nobody will be used.

$INTERVAL

This value depends on limits used and builds on server's local time. For per hour limits it's like YYYYMMDDHH, for per day limits - YYYYMMDD. Y, M, D, H symbols mean part of current time: YYYY - year, MM - month, DD - day and HH - hour.

Typical values of the cache_key

    throttle:127.0.0.1:nobody:2013032006
    throttle:10.90.90.90:chim:20130320

expire_in

Time (in seconds) formatted according to given limits of requests after which limits will be reset.

reqs_max

Returns maximum available requests.

requester_id

Returns a part of client indentifier. A value will changing via the main module Plack::Middleware::Throttle::Lite. In common, it's looks like

    throttle:$REMOTE_ADDR:$REMOTE_USER

See "cache_key" for details about $REMOTE_ADDR and $REMOTE_USER.

settings

Returns some configuration parameters for given limits of requests.

units

Returns measuring units for given limits of requests.

ymdh

Returns value of current date and time according to given limits.

BACKENDS OVERVIEW

Each backend can be implemented in Plack::Middleware::Throttle::Lite::Backend namespace or in your preferred namespace like My::OwnSpace. In this case you should provide full module name prepended with + (plus) sign in middleware's options.

    enable 'Throttle::Lite',
        backend => '+My::OwnSpace::MyBackend';

or (with options)

    enable 'Throttle::Lite',
        backend => [ '+My::OwnSpace::MyBackend' => { foo => 'bar', baz => 1 } ];

At the moment known the following storage backends:

Plack::Middleware::Throttle::Lite::Backend::Simple

Very simple (in-memory) storage backend. Shipped with this distribution. All data holds in memory. See details Plack::Middleware::Throttle::Lite::Backend::Simple.

Plack::Middleware::Throttle::Lite::Backend::Redis

Redis-driven storage backend. Take care about memory consumption, has re-connect feature and can use tcp or unix-socket connection to the redis-server. See details Plack::Middleware::Throttle::Lite::Backend::Redis.

Plack::Middleware::Throttle::Lite::Backend::Memcached

Memcached-driven storage backend. See details Plack::Middleware::Throttle::Lite::Backend::Memcached.

BUGS

Please report any bugs or feature requests through the web interface at https://github.com/Wu-Wu/Plack-Middleware-Throttle-Lite/issues

SEE ALSO

Plack::Middleware::Throttle::Lite

Plack::Middleware::Throttle::Lite::Backend::Simple

AUTHOR

Anton Gerasimov <chim@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2013 by Anton Gerasimov.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.