Plack basics for Perl websites - YAPC::EU 2011

Plack BasicsLeo Lapworth @ YAPC::EU 2011 Much content from Tatsuhiko Miyagawa’s YAPC::NA 2010 talk

What is Plack?

What is Plack?“Superglue for Perl 5 Web Frameworks and Web Servers”

How will that help me?

How will that help me?‣ Flexibility

How will that help me?‣ Flexibility‣ Middleware (plugins)

How will that help me?‣ Flexibility‣ Middleware (plugins)‣ Apps

How will that help me?‣ Flexibility‣ Middleware (plugins)‣ Apps‣ Development

How will that help me?‣ Flexibility‣ Middleware (plugins)‣ Apps‣ Development‣ Testing

How will that help me?‣ Flexibility‣ Middleware (plugins)‣ Apps‣ Development‣ Testing‣ Deployment

How will that help me?‣ Flexibility‣ Middleware (plugins)‣ Apps‣ Development‣ Testing‣ Deployment‣ World peace

History...

Hello World

#!/usr/bin/perluse strict;print “Content-Type: text/plainrnrn”;print “Hello World”;

package HelloWorld;use strict;use Apache::RequestRec;use Apache::RequestIO;use Apache::Const -compile => qw(OK);sub handler { my $r = shift; $r->content_type(‘text/plain’); $r->print(“Hello World”); return Apache::Const::OK;}1;

use FCGI;my $req = FCGI::Request();while ($req->Accept >= 0) { print “Content-Type: text/plainrnrn”; print “Hello World”;}

package HelloWorld;use base qw(HTTP::Server::Simple::CGI);sub handle_request { my($self, $cgi) = @_; print “HTTP/1.0 200 OKrn”; print “Content-Type: text/plainrnrn”; print “Hello World”;}1;

All similarbut slightly different

Painful to support all of them 

There wasone common way to do all of this.

CGI.pm

#!/usr/bin/perluse CGI;my $q = CGI->new;print $q->header(‘text/plain’);print “Hello World”;

Works under... CGI FastCGI mod_perlHTTP::Server::Simple::CGI

CGI.pmmod_perl CGI fastcgiApache IIS lighttpd

CGI.pm?

CGI.pm? meh

Frameworksto the rescue!

Catalyst Maypole Mason Mojo Sledge Spoon PageKit AxKit Egg Gantry Continuity Solstice Mojolicious Tripletail Konstrukt Reaction Jifty Cyclone3 WebGUI OpenInteract Squatting Dancer CGI::Application Nanoa Ark Angelos Noe Schenker Tatsumaki AmonApache2::WebApp Web::Simple Apache2::REST SweetPea Hydrant Titanium

Let’s look how theyhandled web servers.

CGI.pmmod_perl CGI fastcgiApache IIS lighttpd

CGI::ApplicationApache IIS lighttpd

CGI::Application CGI.pmApache IIS lighttpd

CGI::Application CGI.pm mod_perl CGI fastcgiApache IIS lighttpd

CGI::Application Jifty CGI.pm mod_perl CGI fastcgiApache IIS lighttpd

CGI::Application Jifty Catalyst CGI.pm mod_perl CGI fastcgiApache IIS lighttpd

CGI::Application Jifty Catalyst CGI.pm Catalyst::Engine mod_perl CGI fastcgiApache IIS lighttpd

CGI::Application Jifty Catalyst CGI.pm Catalyst::Engine mod_perl CGI fastcgiApache IIS lighttpd nginx

CGI::Application Jifty Catalyst CGI.pm Catalyst::Engine mod_perl CGI fastcgiHTTP::Server ::Simple Apache IIS lighttpd nginx

Mason CGI::Application Jifty Catalyst CGI.pm Catalyst::Engine mod_perl CGI fastcgiHTTP::Server ::Simple Apache IIS lighttpd nginx

Mason CGI::Application Jifty CatalystMason::CGIHandler CGI.pm Catalyst::Engine mod_perl CGI fastcgi HTTP::Server ::Simple Apache IIS lighttpd nginx

Gross.

CGI.pm Jifty, CGI::Application, Spoonmod_perl centricMason, Sledge, PageKit, WebGUI Adapters Catalyst, Maypole, Squatting

That was 2008...

Gentleman thief & Double agentMiyagawa

Acquired a great idea from Python/Ruby

WSGI (Python) Rack (Ruby)

WSGI (PEP-333)

WSGI Python Frameworks • Django • mod_wsgi • Bottle • Paste • CherryPy • gunicorn • Tornado • uWSGI • Pylons • wsgiref • Flask • Google AppEngine

Django Bottle Flask Tornado WSGI middleware WSGI wsgi handlersApache lighttpd nginx mod_wsgi GAE

Rack Ruby Frameworks• Rails • Unicorn• Merb • Thin• Sinatra • Mongrel• Camping • Rainbows!• Ramaze • Phusion Passenger• etc. • Heroku

Rails Merb Sinatra Ramaze Rack middleware Rack Rack handlersApache lighttpd Thin Unicorn Mongrel

Perl ?

PSGI Perl ?Perl Web Server Gateway Interface

Interface

InterfacePSGI != Plack

PSGI application code reference $app = sub {...};

# PSGI Hello Worldmy $app = sub { my $env = shift; return [ 200, [ ‘Content-Type’, ‘text/plain’ ], [ ‘Hello World’ ], ];};

my $app = sub { my $env = shift; return [ $status, $header, $body ];}; CGI-like environment variables + psgi.input, psgi.errors etc.

my $app = sub { my $env = shift; return [ $status, $header, $body ];}; HTTP status code (int.): 200, 404 etc.

my $app = sub { my $env = shift; return [ $status, $header, $body ];}; Array reference of header pairs: [ ‘Content-Type’, ‘text/html’, ... ]

my $app = sub { my $env = shift; return [ $status, $header, $body ];}; String, array reference of content chunks, Filehandle or IO::Handle-ish object

That’s it.(There’s a callback based streaming interface as well)

# PSGImy $app = sub { my $env = shift; return [ 200, [ ‘Content-Type’, ‘text/plain’ ], [ ‘Hello World’ ], ];};

Now you’ve gota PSGI compatible application.

Mason CGI::App Jifty CatalystMason::CGIHandler CGI.pm Catalyst::Engine mod_perl CGI fastcgi HTTP::Server ::Simple Apache IIS lighttpd nginx

Catalyst CGI::App Jifty Mason 2 Plack::Middleware PSGI Compatible App Plack::Handler::* (CGI, FCGI, Apache)Apache lighttpd HTTP::Server::PSGI mod_psgi Perlbal

Catalyst CGI::App Jifty Mason 2 Plack::Middleware PSGI Compatible App Plack::Handler::* (CGI, FCGI, Apache)Apache lighttpd HTTP::Server::PSGI mod_psgi Perlbal other PSGI Webservers

Web Servers

Plack::HandlerConnects PSGI compatible apps to Web servers...

FCGIPlack::Handler::FCGI

ApachePlack::Handler::Apache1Plack::Handler::Apache2

StarmanUNIX Preforking HTTP servers (like Unicorn.rb) HTTP/1.1 chunk + keep-alives / Very Fast

HTTP::Server::Simple::PSGI Zero-deps other than HTTP::Server::Simple Best for embedding PSGI applications

Twiggy Non-blocking web server (like Thin.rb) based on AnyEvent framework Starlet Simpler UNIX HTTP/1.0 ServerBest used with Server::Starter and nginx/lighttpd

Perlbal pluginhttp://github.com/miyagawa/Perlbal-Plugin-PSGI

nginx embedded perl http://github.com/yappo/nginx-psgi-patchs

mod_psgihttp://github.com/spiritloose/mod_psgi Apache2

Corona uWSGICoroutine for each connection http://projects.unbit.it/uwsgi/ based on Coro.pm Feersum evpsgihttp://github.com/stash/Feersum http://github.com/sekimura/evpsgi Gepok http://metacpan/module/Gepok Pure Perl standalone HTTPS First released July 2011

Frameworks Apps Your own code Plack::Middleware PSGI Plack::Handler::* (CGI, FCGI, Apache)

Frameworks Apps Your own code Plack::Middleware PSGI Plack::Handler::* (CGI, FCGI, Apache)Apache lighttpd HTTP::Server::PSGI mod_psgi PerlbalStarman Twiggy uWSGI Corona etc, etc

25+ Plack::Handlers

Adoption?

Plack::Middleware PSGI Compatible App Plack::Handler::* (CGI, FCGI, Apache)Apache lighttpd HTTP::Server::PSGI mod_psgi PerlbalStarman Twiggy uWSGI Corona etc

? Plack::Middleware PSGI Compatible App Plack::Handler::* (CGI, FCGI, Apache)Apache lighttpd HTTP::Server::PSGI mod_psgi PerlbalStarman Twiggy uWSGI Corona etc

Catalyst Maypole Mason Mojo Sledge Spoon PageKit AxKit Egg Gantry Continuity Solstice MojoliciousTripletail Konstrukt Reaction Jifty Cyclone3 WebGUI OpenInteract Squatting Dancer CGI::Application Nanoa Ark Angelos Noe Schenker Tatsumaki Amon Apache2::WebApp Web::Simple Apache2::REST SweetPea Hydrant Titanium

PSGI Perl Frameworks• Amon • Hydrant • Schenker• Angelos • Jifty • Sledge• Ark • Mason • Squatting• Catalyst • Maypole • Tatsumaki• CGI::Application • Mojo • Titanium• Continuity • Mojolicious • Web::Simple• Dancer • Noe

Applications Movable Type 6 WebGUI 8 RT4 ACT (conference toolkit)Bricolage (if someone gets time)

Plack::Middleware PSGI Compatible App Plack::Handler::* (CGI, FCGI, Apache)Apache lighttpd HTTP::Server::PSGI mod_psgi PerlbalStarman Twiggy uWSGI Corona evpsgi

Catalyst CGI::App Jifty Tatsumaki Dancer Mojoliscious MT6 Mason 2 Web::Simple WebGui 8 Mojo etc... Plack::Middleware PSGI Compatible App Plack::Handler::* (CGI, FCGI, Apache)Apache lighttpd HTTP::Server::PSGI mod_psgi PerlbalStarman Twiggy uWSGI Corona evpsgi

PSGI from a framework

use Dancer;get ‘/’ => sub { “Hello World”;};dance;

use Mojolicious::Lite;get ‘/:name’ => sub { my $self = shift; $self->render_text(‘Hello!’);};app->start;

use My::Jifty::App;my $app = My::Jifty::App->psgi_app;

use Web::Simple ‘MyApp’;package MyApp;dispatch { sub(GET) { [ 200, [...], [ ‘Hello’ ] ]; }};my $app = MyApp->as_psgi;

use My::Catalyst::App;My::Catalyst::App->setup_engine(‘PSGI’);my $app = sub { My::Catalyst::App->run(@_) };

catalyst.pl My::Catalyst::App

Plack“PSGI implementation & toolkit”

Plack toolkit

Plack toolkitPlack::Handlers Connect PSGI apps and Web Servers

Plack toolkitPlack::Handlers Connect PSGI apps and Web Servers plackup Command line launcher

Plack toolkitPlack::Handlers Connect PSGI apps and Web Servers plackup Command line launcherPlack::Loader (auto)load Plack Servers

Plack toolkit Plack::Handlers Connect PSGI apps and Web Servers plackup Command line launcher Plack::Loader (auto)load Plack ServersPlack::Middleware Easy-to-use PSGI Middleware

Plack toolkit Plack::Handlers Connect PSGI apps and Web Servers plackup Command line launcher Plack::Loader (auto)load Plack ServersPlack::Middleware Easy-to-use PSGI Middleware Plack::Builder OO & DSL to enable Middleware

Plack toolkit Plack::Handlers Connect PSGI apps and Web Servers plackup Command line launcher Plack::Loader (auto)load Plack ServersPlack::Middleware Easy-to-use PSGI Middleware Plack::Builder OO & DSL to enable Middleware Plack::Apps Apps

Plack toolkit Plack::Handlers Connect PSGI apps and Web Servers plackup Command line launcher Plack::Loader (auto)load Plack ServersPlack::Middleware Easy-to-use PSGI Middleware Plack::Builder OO & DSL to enable Middleware Plack::Apps Apps Plack::Test Testing

plackupRuns PSGI app instantly from CLI (inspired by rackup)

> plackup app.psgi

> plackup app.psgiHTTP::Server::PSGI: Acceptingconnections at http://0:5000/

HTTP::Server::PSGI Reference PSGI web server bundled in Plack Standalone, single-process HTTP server great for development and testing

Plack::Middleware (160+ modules - July 2011)

Middleware Debug, Session, Logger, Static, Lint,AccessLog, ErrorDocument, StackTrace, Auth::Basic, Auth::Digest, ReverseProxy, Refresh, Auth::OAuth, Throttle....

Chunked Class::Refresh Compile Conditional ConditionalGETConsoleLogger ContentLength ContentMD5 CrossOriginCSRFBlock Dancer::Debug DBIC::QueryLog DebugDebug::CatalystPluginCache Debug::DBIC::QueryLogDebug::DBIProfile Debug::Profiler::NYTProf Debug::W3CValidateDeflater DoCoMoGUID Doorman ErrorDocument ESI ETagExpires File::Sass Firebug::Lite FirePHP ForceEnv Head HeaderHTMLify HTMLMinify HTTPExceptions IEnosniff IIS6ScriptNameFixImage::Scale Inline InteractiveDebugger IPAddressFilter iPhoneJavaScript::Ectype JSConcat JSONP LighttpdScriptNameFix LintLog::Contextual Log::Minimal Log4perl LogDispatch LogWarnMethodOverride Mirror NeverExpire NoDeflate NoMultipleSlashesNullLogger Options OptionsOK Precompressed ProxyMapRearrangeHeaders Recursive RefererCheck Refresh REPL ReproxyReverseProxy Rewrite Runtime Scope::Container Scope::SessionServerStatus::Lite Session Session::SerializedCookie SetAcceptSimpleContentFilter SimpleLogger SizeLimit SocketIO SSIStackTrace Static Static::Minifier StaticShared StatusTest::StashWarnings Throttle TMT UseChromeFrame Watermark

Plack Middleware Wraps a PSGI applicationto add pre/post processing

Logging

LoggingStatus code redirect

LoggingStatus code redirectError Handler

LoggingStatus code redirectError HandlerCache Middleware

LoggingStatus code redirectError HandlerCache MiddlewareSession Middleware

LoggingStatus code redirectError HandlerCache MiddlewareSession MiddlewareRoutes Middleware

LoggingStatus code redirectError HandlerCache MiddlewareSession MiddlewareRoutes MiddlewareYour App

Plack::Middleware::A Plack::Middleware::B PSGI Compatible App

Plack::Middleware::A Plack::Middleware::B PSGI Compatible AppRequest in

Plack::Middleware::A Plack::Middleware::B PSGI Compatible AppRequest in P::MW::A

Plack::Middleware::A Plack::Middleware::B PSGI Compatible AppRequest in P::MW::A P::MW::B

Plack::Middleware::A Plack::Middleware::B PSGI Compatible AppRequest in P::MW::A P::MW::B PSGI App

Plack::Middleware::A Plack::Middleware::B PSGI Compatible AppRequest in P::MW::A P::MW::B P::MW::B PSGI App

Plack::Middleware::A Plack::Middleware::B PSGI Compatible AppRequest in P::MW::A P::MW::A P::MW::B P::MW::B PSGI App

Plack::Middleware::A Plack::Middleware::B PSGI Compatible AppRequest in Response out P::MW::A P::MW::A P::MW::B P::MW::B PSGI App

Plack::Middleware::A Plack::Middleware::B PSGI Compatible AppRequest in e.g. Redirect Response out P::MW::A P::MW::A P::MW::B P::MW::B PSGI App

Plack::Middleware::A Plack::Middleware::B PSGI Compatible AppRequest in e.g. Redirect Response out P::MW::A P::MW::A e.g. Static P::MW::B P::MW::B PSGI App

EnablingPlack::Middleware reusable and extensible Middleware framework Plack::Builder DSL in .psgi

my $app = sub { return [ $status, $header, $body ];};use Plack::Builder;return builder { enable “A”; enable “B”; $app;}

my $app = sub { return [ $status, $header, $body ];};use Plack::Builder;return builder { enable “A”; # Plack::Middleware::A enable “B”; # Order matters $app;}

my $app = sub { return [ $status, $header, $body ];};use Plack::Builder;return builder { enable “A”; enable “B”; $app;}

my $app = sub { return [ $status, $header, $body ];};use Plack::Builder;return builder { enable “Static”, root => “/htdocs”, path => qr!^/static/!; enable “Deflater”; $app;}

my $app = sub { return [ $status, $header, $body ];};use Plack::Builder;return builder { enable “Static”, root => “/htdocs”, path => qr!^/static/!; enable “Deflater”; # gzip/deflate $app;}

my $app = sub { return [ $status, $header, $body ];};use Plack::Builder;return builder { enable “Static”, root => “/htdocs”, path => qr!^/static/!; enable “Deflater”; $app;}

Plack::Middleware::Static Plack::Middleware::Deﬂate PSGI Compatible App

Plack::Middleware::Static Plack::Middleware::Deﬂate PSGI Compatible AppRequest in

Plack::Middleware::Static Plack::Middleware::Deﬂate PSGI Compatible AppRequest in Static

Plack::Middleware::Static Plack::Middleware::Deﬂate PSGI Compatible AppRequest in Response out =~ ^/static Static

Plack::Middleware::Static Plack::Middleware::Deﬂate PSGI Compatible AppRequest in Response out =~ ^/static Static -

Plack::Middleware::Static Plack::Middleware::Deﬂate PSGI Compatible AppRequest in Response out =~ ^/static Static - PSGI App

Plack::Middleware::Static Plack::Middleware::Deﬂate PSGI Compatible AppRequest in Response out =~ ^/static Static - Deﬂate compresses PSGI App

Plack::Middleware::Static Plack::Middleware::Deﬂate PSGI Compatible AppRequest in Response out =~ ^/static Static - - Deﬂate compresses PSGI App

plackup compatibleplackup -e ‘enable “Foo”;’ app.psgi

MiddlewareWrite once, run in every framework

A few demos..

Assume...use Plack::Builder;my $body = ‘<html><body>Hello World</body></html>’;my $app = sub { my $self = shift; return [200, [Content-Type => text/html], [ $body ]];};

Debugger

return builder { # Precious debug info. Right on your page! enable Debug; $app;}

InteractiveDebugger

my $app = sub { my $foo = bar; die "oops" if $foo eq bar; [200, [Content-Type => text/html], [ $body ]];};return builder { # Enable Interactive debugging enable "InteractiveDebugger"; $app;}

NYTProf - proﬁler

First rule of Program Optimisation

Don’t do it!

Second rule of Program Optimisation (for experts only)

Don’t do it - yet!

return builder { enable Debug, panels => [ [ Proﬁler::NYTProf ] ]; $app;};

ServerStatus::Lite

use Plack::Builder;return builder { enable "ServerStatus::Lite", path => /server-status, allow => [ 127.0.0.1], scoreboard => /tmp/score; $app;}

SizeLimit

use Plack::Builder;return builder { enable "SizeLimit", max_unshared_size_in_kb => 3000, check_every_n_requests => 5; $app;}

Plack::App::*ready-to-use applications

Apache::ActionWrapper CGIBin CascadeCocProxy DAV Directory Directory::XslateFCGIDispatcher File ImageMagick JSP PSGIBinPath::Router ProxyProxy::Backend::AnyEvent::HTTPProxy::Backend::LWP Proxy::Selective Proxy::TestURLMap WrapApacheReqWrapApacheReq::FakeRequest WrapCGI

Plack::App::CGIBinmount /cgi-bin as PSGI applications

CGI::PSGIEasy migration from CGI.pm

Plack::App::Directory Static content ﬁle server

Plack::App::Proxy (non-blocking) proxy serverCan be used as reverse proxy as well

Plack::App::JSPRuns JavaScript PSGI apps :)

# app.psgi - Javascript!Plack::App::JSP->new( js => q{ function respond(body) { return [ 200, [ Content-type, text/html ], [ body ] ] } respond("Five factorial is " + (function(x) { if ( x<2 ) return x; return x * arguments.callee(x - 1); })(5) );});

Plack::App::URLMap Multiplex multiple apps Integrated with Builder DSL

use CatApp;use CGIApp;my $c1 = sub { CatApp->run };my $c2 = sub { CGIApp->run_psgi };use Plack::Builder;return builder { mount “/cat” => $c1; mount “/cgi-app” => builder { enable “StackTrace”; $c2; };}

Some more demos...

Basic website

TemplateToolkit + Static

my $root = /path/to/html_doc_root;my $app = Plack::Middleware::TemplateToolkit->new( INCLUDE_PATH => root,)->to_app;return builder { enable Static, path => qr{.[gif|png|jpg|swf|ico|mov|mp3|pdf|js|css]$}, root => $root; $app;}

Creating utilities

Caching Proxy

Website

WebsiteDeveloping code

Slow website WebsiteDeveloping code

Slow websiteDeveloping code

Slow website Caching ProxyDeveloping code

use Plack::Middleware::Cache;use Plack::App::Proxy;my $app = Plack::App::Proxy->new( remote => "http://london.pm.org/" )->to_app;return builder { enable "Cache", match_url => ^/.*, # everything cache_dir => /tmp/plack-cache; $app;};

use LWP::Simple;my $content = get(‘http://localhost:5000/’);

Caching Proxy + Domain hijack

use LWP::Simple;my $content = get(‘http://localhost:5000/’);

use LWP::Simple;my $content = get(‘http://london.pm.org/’);

my $app = Plack::App::Proxy->new( remote => "http://london.pm.org/" )->to_app;return builder { enable "Cache", match_url => ^/.*, # everything cache_dir => /tmp/plack-cache2; $app;};

my $app = Plack::App::Proxy->new( remote => "http://london.pm.org/" )->to_app;$app = builder { enable "Cache", match_url => ^/.*, # everything cache_dir => /tmp/plack-cache2; $app;};

# Hijack Any LWP::Useragent requestsLWP::Protocol::PSGI->register($app);use LWP::Simple;my $content = get("http://london.pm.org/");say o/ if $content =~ /London Perl Mongers/;

Plack::TestUniﬁed interface to write TAP tests with Mock HTTP and Live HTTP

use Plack::Test;use HTTP::Request::Common;my $app = sub { my $env = shift; return [ $status, $header, $body ];};test_psgi app => $app, client => sub { my $callback = shift; my $req = GET “http://localhost/foo”; my $res = $callback->($req); ok $res->[0] == ‘200’, ‘Success’; };

Test::WWW::Mechanize::PSGI

use Test::WWW::Mechanize::PSGI; my $mech = Test::WWW::Mechanize::PSGI->new( app => $app, );$mech->get_ok(/);

Testing your full conﬁguration!

Network setup tip

Use a reverse proxy

Use a reverse proxy• Sits in front of servers, not clients - “reverse”

Use a reverse proxy• Sits in front of servers, not clients - “reverse”• Makes servers more efﬁcient

Use a reverse proxy• Sits in front of servers, not clients - “reverse”• Makes servers more efﬁcient• Add HTTPS easily

Use a reverse proxy• Sits in front of servers, not clients - “reverse”• Makes servers more efﬁcient• Add HTTPS easily• Makes scaling easier

Internet / UsersWebserver App

Internet / Users Reverse Proxy NGINX Perlbal PoundWebserver App

Reverse ProxyNGINX Perlbal Pound Server

Reverse Proxy NGINX Perlbal PoundServer 1 Server 2

Reverse Proxy NGINX Perlbal PoundServer 1 Server 3 Server 2

Plack::Middleware::ReverseProxy Updates $env->{REMOTE_ADDRESS}

Why use Plack?

Why use Plack?‣ Flexibility‣ Middleware‣ Apps‣ Development‣ Testing‣ Deployment

Flexibility Plack::Handler::* (CGI, FCGI, Apache)Apache lighttpd HTTP::Server::PSGI mod_psgi PerlbalStarman Twiggy uWSGI Corona etc

Flexibility• Easy to change webserver (25+!) Plack::Handler::* (CGI, FCGI, Apache) Apache lighttpd HTTP::Server::PSGI mod_psgi Perlbal Starman Twiggy uWSGI Corona etc

Flexibility• Easy to change webserver (25+!) Plack::Handler::* (CGI, FCGI, Apache) Apache lighttpd HTTP::Server::PSGI mod_psgi Perlbal Starman Twiggy uWSGI Corona etc• Starman seems to be used most

Middleware

Middleware• Easy to reuse with any PSGI app

Middleware• Easy to reuse with any PSGI app• Many tools to make your life easy

Middleware• Easy to reuse with any PSGI app• Many tools to make your life easy• 160+ on CPAN now

App• URLMapping / Routing

App• URLMapping / Routing• Static ﬁles

App• URLMapping / Routing• Static ﬁles• Proxying

Development

Development• plackup

Development• plackup• Restarter (monitor changes on disk)

Development• plackup• Restarter (monitor changes on disk)• HTTP::Server::PSGI

Development• plackup• Restarter (monitor changes on disk)• HTTP::Server::PSGI• Debugging middleware

Development• plackup• Restarter (monitor changes on disk)• HTTP::Server::PSGI• Debugging middleware• Proﬁler

Testing

Testing• Testing your full conﬁguration

Testing• Testing your full conﬁguration• Test::WWW::Mechanize::PSGI

Testing• Testing your full conﬁguration• Test::WWW::Mechanize::PSGI• Plack::Test

Deployment

Deployment• No separate conﬁguration ﬁles

Deployment• No separate conﬁguration ﬁles• Easy to choose/change webserver

Deployment• No separate conﬁguration ﬁles• Easy to choose/change webserver• DotCloud etc - cloud deployment

Summary

Summary✦ PSGI is an interface, Plack is the code.

Summary✦ PSGI is an interface, Plack is the code.✦ Many fast PSGI servers.

Summary✦ PSGI is an interface, Plack is the code.✦ Many fast PSGI servers.✦ Adapters and tools for frameworks and webservers.

Summary✦ PSGI is an interface, Plack is the code.✦ Many fast PSGI servers.✦ Adapters and tools for frameworks and webservers.✦ An amazing amount of middleware

Summary✦ PSGI is an interface, Plack is the code.✦ Many fast PSGI servers.✦ Adapters and tools for frameworks and webservers.✦ An amazing amount of middleware✦ Used in many production systems

Use Plack

Thank you!Slides: http://slideshare.net/ranguard http://plackperl.org/ irc://irc.perl.org/#plack

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Plack basics for Perl websites - YAPC::EU 2011

by leo lapworth on Aug 16, 2011

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Plack basics for Perl websites - YAPC::EU 2011 — Presentation Transcript