1Dancer::Session(3)    User Contributed Perl Documentation   Dancer::Session(3)
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NAME

6       Dancer::Session - session engine for the Dancer framework
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VERSION

9       version 1.3513
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DESCRIPTION

12       This module provides support for server-side sessions for the Dancer
13       web framework. The session is accessible to the user via an abstraction
14       layer implemented by the Dancer::Session class.
15

USAGE

17   Configuration
18       The session engine must be first enabled in the environment settings,
19       this can be done like the following:
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21       In the application code:
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23           # enabling the YAML-file-based session engine
24           set session => 'YAML';
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26       Or in config.yml or environments/$env.yml
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28           session: "YAML"
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30       By default sessions are disabled, you must enable them before using it.
31       If the session engine is disabled, any Dancer::Session call will throw
32       an exception.
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34       See "Configuration" in Dancer::Session::Abstract for more configuration
35       options.
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37   Route Handlers
38       When enabled, the session engine can be used in a route handler with
39       the keyword session. This keyword allows you to store/retrieve values
40       from the session by name.
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42       Storing a value into the session:
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44           session foo => 'bar';
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46       Retrieving that value later:
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48           my $foo = session 'foo';
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50       You can either look for an existing item in the session storage or
51       modify one.  Here is a simple example of two route handlers that
52       implement basic "/login" and "/home" actions using the session engine.
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54           post '/login' => sub {
55               # look for params and authenticate the user
56               # ...
57               if ($user) {
58                   session user_id => $user->id;
59               }
60           };
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62           get '/home' => sub {
63               # if a user is present in the session, let him go, otherwise redirect to
64               # /login
65               if (not session('user_id')) {
66                   redirect '/login';
67               }
68           };
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70       Of course, you probably don't want to have to duplicate the code to
71       check whether the user is logged in for each route handler; there's an
72       example in the Dancer::Cookbook showing how to use a before filter to
73       check whether the user is logged in before all requests, and redirect
74       to a login page if not.
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SUPPORTED ENGINES

77       Dancer has a modular session engine that makes implementing new session
78       backends pretty easy. If you'd like to write your own, feel free to
79       take a look at Dancer::Session::Abstract.
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81       The following engines are supported out-of-the-box (shipped with the
82       core Dancer distribution):
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84       Dancer::Session::YAML
85           A YAML file-based session backend, pretty convenient for
86           development purposes, but maybe not the best for production needs.
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88       Dancer::Session::Simple
89           A very simple session backend, holding all session data in memory.
90           This means that sessions are volatile, and no longer exist when the
91           process exits.  This module is likely to be most useful for testing
92           purposes, and of little use for production.
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94       Additionally, many more session engines are available from CPAN,
95       including:
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97       Dancer::Session::Memcached
98           Session are stored in Memcached servers. This is good for
99           production matters and is a good way to use a fast, distributed
100           session storage.  If you may be scaling up to add additional
101           servers later, this will be a good choice.
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103       Dancer::Session::Cookie
104           This module implements a session engine for sessions stored
105           entirely inside encrypted cookies (this engine doesn't use a
106           server-side storage).
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108       Dancer::Session::Storable
109           This backend stores sessions on disc using Storable, which offers
110           solid performance and reliable serialization of various data
111           structures.
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113       Dancer::Session::MongoDB
114           A backend to store sessions using MongoDB
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116       Dancer::Session::KiokuDB
117           A backend to store sessions using KiokuDB
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119       Dancer::Session::PSGI
120           Let Plack::Middleware::Session handle sessions; may be useful to
121           share sessions between a Dancer app and other Plack-based apps.
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DEPENDENCY

124       Dancer::Session may depend on third-party modules, depending on the
125       session engine used. See the session engine module for details.
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AUTHORS

128       This module has been written by Alexis Sukrieh. See the AUTHORS file
129       that comes with this distribution for details.
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LICENSE

132       This module is free software and is released under the same terms as
133       Perl itself.
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SEE ALSO

136       See Dancer for details about the complete framework.
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AUTHOR

139       Dancer Core Developers
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142       This software is copyright (c) 2010 by Alexis Sukrieh.
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144       This is free software; you can redistribute it and/or modify it under
145       the same terms as the Perl 5 programming language system itself.
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149perl v5.34.0                      2021-07-22                Dancer::Session(3)
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