1Catalyst::Plugin::SessiUosne:r:SCtoonrter(i3b)uted PerlCDaotcaulmyesntt:a:tPiloungin::Session::Store(3)
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6 Catalyst::Plugin::Session::Store - Base class for session storage
7 drivers.
8
10 package Catalyst::Plugin::Session::Store::MyBackend;
11 use base qw/Catalyst::Plugin::Session::Store/;
12
14 This class doesn't actually provide any functionality, but when the
15 "Catalyst::Plugin::Session" module sets up it will check to see that
16 "YourApp->isa("Catalyst::Plugin::Session::Store")". When you write a
17 session storage plugin you should subclass this module for this reason.
18 This documentation is intended for authors of session storage plugins,
19 not for end users.
20
22 All session storage plugins need to adhere to the following interface
23 specification to work correctly:
24 Required Methods
26 get_session_data $key
27 store_session_data $key, $data
28 Retrieve or store session data by key.
29 $data is currently either a hash reference (for most keys) or an
31 integer value (for expires), but all value types should be
32 supported.
33 Keys are in the format "prefix:id", where "prefix" is "session",
35 "expires", or "flash", and "id" is always the session ID. Plugins
36 such as Catalyst::Plugin::Session::PerUser store extensions to this
37 format, such as "user:username".
38 It is suggested that the store should split on the colon and store
40 the data more efficiently - the API should remain stable, with the
41 possible addition of new prefixes in the future.
42 For example, "Store::DBI" maps "expires:id" a column of
44 "session:id" by special-casing "get_session_data" and
45 "store_session_data" for that key format, in order to ease the
46 implementation of "delete_expired_sessions".
47 The only assurance stores are required to make is that given
49 $c->store_session_data( $x, $y );
51 for any $x,
53 $y == $c->get_session_data( $x )
55 will hold.
57 store_session_data ( $key, $data )
59 Store a session whose KEY is the first parameter and data is the
60 second parameter in storage.
61 The second parameter is a hash reference, which should normally be
63 serialized (and later deserialized by "get_session_data").
64 delete_session_data ( $key )
66 Delete the session whose KEY is the parameter.
67 delete_expired_sessions
69 This method is not called by any code at present, but may be called
70 in the future, as part of a Catalyst-specific maintenance script.
71 If you are wrapping around a backend which manages its own auto
73 expiry you can just give this method an empty body.
74 Error handling
76 All errors should be thrown using Catalyst::Exception. Return values
77 are not checked, and are assumed to be OK. Missing values are not
78 errors.
79 Auto-Expiry on the Backend
81 Storage plugins are encouraged to use "$c->session_expires",
82 "$c->config('Plugin::Session' => { expires => $val })", or the storage
83 of the "expires:$sessionid" key to perform more efficient expiration,
84 but only for the key prefixes "session", "flash" and "expires".
85 If the backend chooses not to do so, Catalyst::Plugin::Session will
87 detect expired sessions as they are retrieved and delete them if
88 necessary.
89 Note that session store that use this approach may leak disk space,
91 since nothing will actively delete an expired session. The
92 "delete_expired_sessions" method is there so that regularly scheduled
93 maintenance scripts can give your backend the opportunity to clean up.
94 Early Finalization
96 By default the main session plugin will finalize during body
97 finalization which ensures that all controller code related to the
98 session has completed. However some storage plugins may wish to
99 finalize earlier, during header finalization. For example a storage
100 that saved state in a client cookie would wish this. If a storage
101 plugin wants to finalize early it should set
102 $c->_needs_early_session_finalization to true. Please note that if you
103 do this in a storage plugin, you should warn users not to attempt to
104 change or add session keys if you use a streaming or socket interface
105 such as $c->res->write, $c->res->write_fh or $c->req->io_fh.
106perl v5.34.0 2022-01-21Catalyst::Plugin::Session::Store(3)