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Clément OUDOT
and 1 contributors


Lemonldap::NG::Common::PSGI - Base library for PSGI modules of Lemonldap::NG. Use Lemonldap::NG::Common::PSGI::Router for REST API.


  package My::PSGI;
  use base Lemonldap::NG::Common::PSGI;
  sub init {
    my ($self,$args) = @_;
    # Will be called 1 time during startup
    # Store debug level
    # Can use syslog for user actions
    # Return a boolean. If false, then error message has to be stored in
    # $self->error
    return 1;
  sub handler {
    my ( $self, $req ) = @_;
    # Do something and return a PSGI response
    # NB: $req is a Lemonldap::NG::Common::PSGI::Request object
    return [ 200, [ 'Content-Type' => 'text/plain' ], [ 'Body lines' ] ];

This package could then be called as a CGI, using FastCGI,...

  #!/usr/bin/env perl
  use My::PSGI;
  use Plack::Handler::FCGI; # or Plack::Handler::CGI

  Plack::Handler::FCGI->new->run( My::PSGI->run() );


This package provides base class for Lemonldap::NG web interfaces but could be used regardless.


Running methods

run ( $args )

Main method that will manage requests. It can be called using class or already created object:


launch new($args), init(), then manage requests (using private _run() method


manage directly requests. Initialization must have be done earlier.


lmLog ( $msg, $level)

Print on STDERR messages if level > $self->{logLevel}. Defined log levels are: debug, info, notice, warn, error.

userLog ($msg, $level)

If $self->syslog is configured, store message with it, else called simply lmLog(). $self->syslog must be empty or contain syslog facility

userError() userNotice() userInfo()

Alias for userLog(level).

Content sending

Note that $req, the first argument of these functions, is a Lemonldap::NG::Common::PSGI::Request. See the corresponding documentation.

sendHtml ( $req, $template )

This method build HTML response using HTML::Template and the template $template. $template file must be in $self->templateDir directory. HTML template will receive 5 variables:

SCRIPT_NAME: the path to the (F)CGI
STATIC_PREFIX: content of $self->staticPrefix
AVAILABLE_LANGUAGES: content of $self->languages
VERSION: Lemonldap::NG version

The response is always send with a 200 code.

sendJSONresponse ( $req, $json, %args )

Stringify $json object and send it to the client. $req is the Lemonldap::NG::Common::PSGI::Request object; %args can define the HTTP error code (200 by default) or headers to add.

If client is not json compatible (`Accept` header), response is send in XML.


  $self->sendJSONresponse ( $req, { result => 0 }, code => 400 );

  $self->sendJSONresponse ( $req, { result => 1 } );

  $self->sendJSONresponse ( $req, { result => 1 }, headers => [ X => Z ] );

sendError ( $req, $msg, $code )

Call sendJSONresponse with `{ error => $msg }` and code (default to 500) and call lmLog() to duplicate error in logs

abort ( $msg )

When an error is detected during startup (init() sub), you must not call sendError() but call abort(). Each request received later will receive the error (abort uses sendError() behind the scene).



String error. Used if init() fails or if sendError is called without argument.


String containing list of languages (ie "fr, en'). Used by sendHtml().


See lmLog().


String indicating the path of static content (js, css,...). Used by sendHtml().


Directory containing template files.

Array of links to display by sendHtml(). Each element has the form:

 { target => 'http://target', title => 'string to display' }


Syslog facility. If empty, STDERR will be used for logging


http://lemonldap-ng.org/, Lemonldap::NG::Portal, Lemonldap::NG::Handler, Plack, PSGI, Lemonldap::NG::Common::PSGI::Router, Lemonldap::NG::Common::PSGI::Request, HTML::Template,


Clement Oudot, <clem.oudot@gmail.com>
François-Xavier Deltombe, <fxdeltombe@gmail.com.>
Xavier Guimard, <x.guimard@free.fr>
Thomas Chemineau, <thomas.chemineau@gmail.com>


Use OW2 system to report bug or ask for features: http://jira.ow2.org


Lemonldap::NG is available at http://forge.objectweb.org/project/showfiles.php?group_id=274


This library is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.