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Auto_insurance_payments_Now_average_usd69_per_month Auto_insurance_payments_Now_average_usd69_per_month Ahh, what the world needs, "yet another web application framework". So, what makes mine better then the others? Nothing really. This was born out of my frustrations with trying to use another "web application framework'. So what does Scaffold give you? Well, it won't create a stand alone application from a simple command line. It won't give you yet another ORMish way to access your databases. It won't auto-generate a lot of boiler plate code. It won't even boast about how independent it is from CPAN. Nor will it attempt to re-invent Ruby-on-Rails, Django or whatever the framework dejour currently is. What it does gives you is the freedom to write your web based application as you see fit. Scaffold brings the following to the table. * A comhensive object structure. * A caching subsystem. * Session management * A locking resource manager * Freedom to choose an ORM * Bindings to the Template Toolkit * Web server independence This is all done thru readily available CPAN modules. What I needed was a simple, easy to use framework that provided caching, session management, resource locking, templating and a URL dispatching system, without any conceived notions on how I should write my code. Scaffold is my attempt to do this. I hope it works for you too. THE BASIC SYSTEM Top Scaffold is an OO based system and OO Perl can be done many different ways. Some are considered the "next best thing" and/or a "best practice" for Perl and everybody should use it, regardless of usability or fitness for that purpose. I choose to use the Badger toolkit. Why, because it made sense, it's as simple as that. Since the class system is built upon Badger, it follows some of Badger's methodology. The base class for Scaffold is Scaffold::Base. This loads Badger::Base, with all of it's goodness, defines some error messages and exposes the config() method. This method is important for other classes within Scaffold. Scaffold::Class This class extends Badger::Class and loads Scaffold::Constants and Scaffold::Utils. Which extends their respected Badger counter parts. Scaffold::Constants defines some global constants used within Scaffold. Scaffold::Utils loads some common utilities that other modules can make usage of. Since Scaffold::Class extends Badger::Class, you can use Badger's meta language within your own modules. Scaffold::Server This is the main entry point to Scaffold. This processes the configuration and loads the various components. Scaffold::Server also parses the URL and invokes handler's to handle the processing of the URL. If there are no corresponding handlers, an exception is thrown. Scaffold::Engine This ties Scaffold::Server to the Plack back end. Scaffold::Handler This is the base class for handlers. It further breaks down the URL to determine which method to invoke. If a method does not match the URL an exception is thrown. Scaffold::Handler is also a state machine. The following states are defined: STATE__ACTION STATE_ACTION STATE_POST_ACTION STATE__RENDER STATE_RENDER STATE_POST_RENDER STATE__EXIT The following handlers are provided: * Scaffold::Handler::Static - handles static pages with the option of storing those pages in cache * Scaffold::Handler::Favicon - load and cache a "favicon.ico" file * Scaffold::Handler::Robots - load and cache a "robots.txt" file * Scaffold::Handler::ExtDirect - an experimental implementation of the Ext.direct RPC protocol * Scaffold::Handler::ExtPoll - an experimental implementing of the Ext.direct polling protocol Scaffold::Plugin This is the base class for plug-ins. Plug-ins are global and they run in loaded order. Plug-ins can be invoked in the following phases of a handler: STATE__ACTION STATE_POST_ACTION STATE_PER_RENDER STATE_POST_RENDER STATE__EXIT Scaffold::Render This is the base class for renderer's. A render, formats the output before it is sent to the browser. By default, this is a raw buffer. Scaffold::Reneder::TT is the interface to the Template Toolkit. The renderer is invoked in the STATE_RENDER phase of a handler. Scaffold::Stash This is the base class for stashes. A stash is global to a handler. The following stashes have been defined: * Scaffold::Stash::View - used to hold the output buffer * Scaffold::Stash::Cookie - used to hold the cookies * Scaffold::Stash::Controller - not currently being used Scaffold::Cache This is the base class for the caching subsystem. The following subsystems have been defined: * Scaffold::Cache::FastMmap * Scaffold::Cache::Memcached Scaffold::Cache::FastMmap is loaded by default. Scaffold::Cache::Manager is used to manage the cache. It is implemented as a plug-in and is the first one to run. It executes in the STATE__ACTION phase of a handler. It purges the cache of expired items. Scaffold::Session Sessions are handled by HTTP::Session. Sessions are stored in temporary cookies. Scaffold::Session::Store::Cache ties session storage to the internal caching subsystem. Scaffold::Session::Manager initialized or reestablishes existing sessions. It is implemented as a plug-in. It is the second one to run and executes in the STATE__ACTION to establish sessions and in STATE__EXIT to create or update the session cookie. Scaffold::Lockmgr This is the base class for implementing a resource lock manager. Scaffold::Lockmgr::KeyedMutex uses KeyedMutex as a distributed lock manager. It is loaded by default. Scaffold::Uaf This implements an authorization and authentication framework. The following modules are base classes and most of them should be overridden by your code. * Scaffold::Uaf::Authenticate - this is a mixin used for authentication * Scaffold::Uaf::Authorize - this is a base class for authorizations * Scaffold::Uaf::Rule - a base class for rules * Scaffold::Uaf::User - a base class for the user object The following are defaults that should be overridden: * Scaffold::Uaf::AuthorizeFactory - a default authorization scheme * Scaffold::Uaf::GrantAllRule - a default rule that grants everything The following are handlers that may be overridden: * Scaffold::Uaf::Login - a handler for authentication * Scaffold::Uaf::Logout - a handler to expire an authentication They have a dependency on Scaffold::Uaf::Authenticate. The following is a plug-in that may be overridden: * Scaffold::Uaf::Manager - a plugin that checks authentication and initiates the login process This has a dependency on Scaffold::Uaf::Authenticate A SIMPLE APPLICATION Top For example, a simple Scaffold application could be written as follows: app.psgi -------- use lib 'lib'; use Scaffold::Server; my $psgi_handler; my $server = Scaffold::Server-new( locations = { '/' = 'App::Main', } ); $psgi_handler = $server-engine-psgi_handler(); ... package App::Main; use Scaffold::Class version = '0.01', base = 'Scaffold::Handler', ; sub do_main my ($self) = @_; my $html = qq( html head titleHello World/title /head body pHello World!/p /body /html ); $self-view-data($html); } ... # plackup -app app.psgi Which would start your application on port 5000 of localhost using the singled threaded Plack server engine. You can direct your browser to that URL and receive a resounding "Hello World!". See, simple, no muss, no fuss. SEE ALSO Top Scaffold::Base Scaffold::Class Scaffold::Constants Scaffold::Engine Scaffold::Server Scaffold::Utils Scaffold::Cache Scaffold::Cache::FastMmap Scaffold::Cache::Manager Scaffold::Cache::Memcached Scaffold::Handler Scaffold::Handler::ExtDirect Scaffold::Handler::ExtPoll Scaffold::Handler::Favicon Scaffold::Handler::Robots Scaffold::Handler::Static Scaffold::Lockmgr Scaffold::Lockmgr::KeyedMutex Scaffold::Plugins Scaffold::Render Scaffold::Render::Default Scaffold::Render::TT Scaffold::Session::Manager Scaffold::Session::Store Scaffold::Session::Store::Cache Scaffold::Stash Scaffold::Stash::Controller Scaffold::Stash::Cookies Scaffold::Stash::Manager Scaffold::Stash::View Scaffold::Uaf::Authenticate Scaffold::Uaf::AuthorizeFactory Scaffold::Uaf::Authorize Scaffold::Uaf::GrantAllRule Scaffold::Uaf::Login Scaffold::Uaf::Logout Scaffold::Uaf::Manager Scaffold::Uaf::Rule Scaffold::Uaf::User AUTHOR Top Kevin L. Esteb, kesteb(at)wsipc.org SUPPORT Top You can find documentation for this module with the perldoc command. perldoc Scaffold COPYRIGHT & LICENSE Top Copyright 2010 Kevin L. Esteb, all rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. Scaffold documentation Contained in the Scaffold distribution. package Scaffold; use 5.008008; use warnings; use strict; our $VERSION = '0.01'; 1; This is the base class for Scaffold. It defines some useful exception messages and a method to access the config cache. ACCESSORS Top config This method is used to return items from the interal config cache. SEE ALSO Top Badger::Base Scaffold Scaffold::Base Scaffold::Cache Scaffold::Cache::FastMmap Scaffold::Cache::Manager Scaffold::Cache::Memcached Scaffold::Class Scaffold::Constants Scaffold::Engine Scaffold::Handler Scaffold::Handler::Favicon Scaffold::Handler::Robots Scaffold::Handler::Static Scaffold::Lockmgr Scaffold::Lockmgr::KeyedMutex Scaffold::Plugins Scaffold::Render Scaffold::Render::Default Scaffold::Render::TT Scaffold::Server Scaffold::Session::Manager Scaffold::Stash Scaffold::Stash::Controller Scaffold::Stash::Cookie Scaffold::Stash::View Scaffold::Uaf::Authenticate Scaffold::Uaf::AuthorizeFactory Scaffold::Uaf::Authorize Scaffold::Uaf::GrantAllRule Scaffold::Uaf::Login Scaffold::Uaf::Logout Scaffold::Uaf::Manager Scaffold::Uaf::Rule Scaffold::Uaf::User Scaffold::Utils AUTHOR Top Kevin L. Esteb, kesteb@wsipc.org COPYRIGHT AND LICENSE Top Copyright (C) 2009 by Kevin L. Esteb This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.5 or, at your option, any later version of Perl 5 you may have available. Scaffold documentation Contained in the Scaffold distribution. package Scaffold::Base; our $VERSION = '0.01'; use Data::Dumper; use Scaffold::Class base = 'Badger::Base', version = $VERSION, messages = { evenparams = "%s requires an even number of paramters\n", noalias = "can not set session alias %s\n", badini = "can not load %s\n", } ; # ---------------------------------------------------------------------- # Public Methods # ---------------------------------------------------------------------- sub config { my ($self, $p) = @_; return $self-{config}-{$p}; } sub custom_error { my ($self, $scaffold, $page_title, $text) = @_; my $die_msg = $text; my $param_dump = Dumper($scaffold-request-parameters-mixed()); $param_dump =~ s/(?:^|\n)(\s+)/&_trim( $1 )/ge; $param_dump =~ s//</g; my $request_dump = Dumper($scaffold-request); my $response_dump = Dumper($scaffold-response); # local $Data::Dumper::Freezer = '_dumper_hook'; my $scaffold_dump = Dumper($scaffold); $request_dump =~ s/(?:^|\n)(\s+)/&_trim( $1 )/ge; $request_dump =~ s//</g; $response_dump =~ s/(?:^|\n)(\s+)/&_trim( $1 )/ge; $response_dump =~ s//</g; $scaffold_dump =~ s/(?:^|\n)(\s+)/&_trim( $1 )/ge; $scaffold_dump =~ s//</g; my $status = $scaffold-response-status || 'Bad Request'; my $page = $self-_error_page(); $page =~ s/##DIE_MESSAGE##/$die_msg/sg; $page =~ s/##PARAM_DUMP##/$param_dump/sg; $page =~ s/##REQUEST_DUMP##/$request_dump/sg; $page =~ s/##RESPONSE_DUMP##/$response_dump/sg; $page =~ s/##SCAFFOLD_DUMP##/$scaffold_dump/sg; $page =~ s/##STATUS##/$status/sg; $page =~ s/##PAGE_TITLE##/$page_title/sge; return $page; } # ---------------------------------------------------------------------- # Public Methods # ---------------------------------------------------------------------- sub _trim { my $spaces = $1; my $new_sp = " " x int( length($spaces) / 4 ); return( "\n$new_sp" ); } sub _dumper_hook { $_[0] = bless { %{ $_[0] }, result_source = undef, }, ref($_[0]); } sub _error_page { my ($self) = @_; return( qq! html head title##PAGE_TITLE## ##STATUS##/title style type="text/css" body { font-family: "Bitstream Vera Sans", "Trebuchet MS", Verdana, Tahoma, Arial, helvetica, sans-serif; color: #ddd; background-color: #eee; margin: 0px; padding: 0px; } .box { background-color: #ccc; border: 1px solid #aaa; padding: 4px; margin: 10px; -moz-border-radius: 10px; } .error { font: 20px Tahoma; background-color: #88003A; border: 1px solid #755; padding: 8px; margin: 4px; margin-bottom: 10px; -moz-border-radius: 10px; } .infos { font: 9px Tahoma; background-color: #779; border: 1px solid #575; padding: 8px; margin: 4px; margin-bottom: 10px; -moz-border-radius: 10px; } .head { font: 12px Tahoma; } .name { font: 12px Tahoma; background-color: #66B; border: 1px solid #557; padding: 8px; margin: 4px; -moz-border-radius: 10px; } /style /head body class="box" class="error"##DIE_MESSAGE##/ class="infos"br/ class="head"usite.params/u/ br / ##PARAM_DUMP## class="head"uRequest Object/u/br/ ##REQUEST_DUMP## class="head"uResponse Object/u/br/ ##RESPONSE_DUMP## class="head"uScaffold Object/u/br/ ##SCAFFOLD_DUMP## / class="name"Running on Scaffold $Scaffold::Base::VERSION/ / /body /html! ); }
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