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Plack at OSCON 2010

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Plack at OSCON 2010

  1. Plack Superglue for Perl Web Frameworks Tatsuhiko Miyagawa YAPC::NA 2010
  2. Tatsuhiko Miyagawa • Lives in San Francisco • Software Engineer @ Six Apart • http://search.cpan.org/~miyagawa/ • @miyagawa • http://bulknews.typepad.com/
  3. Web Applications
  4. Hello World
  5. #!/usr/bin/perl use strict; print “Content-Type: text/plainrnrn”; print “Hello World”;
  6. use FCGI; my $req = FCGI::Request(); while ($req->Accept >= 0) { print “Content-Type: text/plainrnrn”; print “Hello World”; }
  7. 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’); $r->print(“Hello World”); return Apache::Const::OK; } 1;
  8. package HelloWorld; use base qw(HTTP::Server::Simple::CGI); sub handle_request { my($self, $cgi) = @_; print “HTTP/1.0 200 OKrn”; print “Content-Type: text/plainrnrn”; print “Hello World”; } 1;
  9. All similar but slightly different
  10. Painful to support all of them :(
  11. There is (was) one common way to do all of this.
  12. #!/usr/bin/perl use CGI; my $q = CGI->new; print $q->header(‘text/plain’); print “Hello World”;
  13. Happens to work on: CGI, FastCGI, mod_perl (HTTP::Server::Simple::CGI)
  14. CGI.pm mod_perl CGI fastcgi Apache IIS lighttpd
  15. CGI.pm? meh
  16. Frameworks to the rescue!
  17. Maypole Mason Mojo Sledge Catalyst 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 Amon Apache2::WebApp Web::Simple Apache2::REST SweetPea Hydrant Titanium
  18. MANY web frameworks
  19. Let’s look how they handle web servers.
  20. CGI.pm mod_perl CGI fastcgi Apache IIS lighttpd
  21. CGI::Application Apache IIS lighttpd
  22. CGI::Application CGI.pm Apache IIS lighttpd
  23. CGI::Application CGI.pm mod_perl CGI fastcgi Apache IIS lighttpd
  24. CGI::Application Jifty CGI.pm mod_perl CGI fastcgi Apache IIS lighttpd
  25. CGI::Application Jifty Catalyst CGI.pm mod_perl CGI fastcgi Apache IIS lighttpd
  26. CGI::Application Jifty Catalyst CGI.pm Catalyst::Engine mod_perl CGI fastcgi Apache IIS lighttpd
  27. CGI::Application Jifty Catalyst CGI.pm Catalyst::Engine mod_perl CGI fastcgi Apache IIS lighttpd nginx
  28. CGI::Application Jifty Catalyst CGI.pm Catalyst::Engine mod_perl CGI fastcgi HTTP::Server ::Simple Apache IIS lighttpd nginx
  29. Mason CGI::Application Jifty Catalyst CGI.pm Catalyst::Engine mod_perl CGI fastcgi HTTP::Server ::Simple Apache IIS lighttpd nginx
  30. Mason CGI::Application Jifty Catalyst Mason::CGIHandler CGI.pm Catalyst::Engine mod_perl CGI fastcgi HTTP::Server ::Simple Apache IIS lighttpd nginx
  31. Gross.
  32. CGI.pm Jifty, CGI::Application, Spoon mod_perl centric Mason, Sledge, PageKit, WebGUI Adapters Catalyst, Maypole, Squatting
  33. That was 2008.
  34. Steal great idea from Python/Ruby
  35. WSGI (Python) Rack (Ruby)
  36. WSGI (PEP-333)
  37. # WSGI def hello(environ, start_response): start_response(“200 OK”, [ (‘Content-Type’, ‘text/plain’) ]) return [“Hello World”]
  38. WSGI • Django • mod_wsgi • Bottle • Paste • CherryPy • gunicorn • Tornado • uWSGI • Pylons • wsgiref • Flask • Google AppEngine
  39. Django Bottle Flask Tornado WSGI middleware WSGI wsgi handlers Apache lighttpd nginx mod_wsgi GAE
  40. Rack
  41. # Rack class Hello def call(env) return [ 200, { “Content-Type” => ”text/plain” }, [“Hello World”] ] end end
  42. Rack • Rails • Unicorn • Merb • Thin • Sinatra • Mongrel • Camping • Rainbows! • Ramaze • Phusion Passenger • etc. • Heroku
  43. Rails Merb Sinatra Ramaze Rack middleware Rack Rack handlers Apache lighttpd Thin Unicorn Mongrel
  44. PSGI Perl Web Server Gateway Interface
  45. Interface
  46. # WSGI def hello(environ, start_response): start_response(“200 OK”, [ (‘Content-Type’, ‘text/plain’) ]) return [“Hello World”]
  47. # Rack class Hello def call(env) return [ 200, { “Content-Type” => ”text/plain” }, [“Hello World”] ] end end
  48. # PSGI my $app = sub { my $env = shift; return [ 200, [ ‘Content-Type’, ‘text/plain’ ], [ ‘Hello World’ ], ]; };
  49. PSGI application code reference $app = sub {...};
  50. my $app = sub { my $env = shift; return [ $status, $header, $body ]; }; CGI-like environment variables + psgi.input, psgi.errors etc.
  51. my $app = sub { my $env = shift; return [ $status, $header, $body ]; }; Status code (int.): 200, 404 etc.
  52. my $app = sub { my $env = shift; return [ $status, $header, $body ]; }; Array reference of header pairs: [ ‘Content-Type’, ‘text/html’, ... ]
  53. my $app = sub { my $env = shift; return [ $status, $header, $body ]; }; Array reference of content chunks Filehandle or IO::Handle-ish obejct
  54. That’s it. (There’s a callback based streaming interface as well)
  55. # PSGI my $app = sub { my $env = shift; return [ 200, [ ‘Content-Type’, ‘text/plain’ ], [ ‘Hello World’ ], ]; };
  56. Now you’ve got a PSGI application.
  57. PSGI makes it so simple to:
  58. Write a new Perl web app & framework
  59. Write a new Perl web server
  60. Mason CGI::Application Jifty Catalyst Mason::CGIHandler CGI.pm Catalyst::Engine mod_perl CGI fastcgi HTTP::Server ::Simple Apache IIS lighttpd nginx
  61. Catalyst CGI::App Jifty Tatsumaki Plack::Middleware PSGI Plack::Handler::* (CGI, FCGI, Apache) Apache lighttpd HTTP::Server::PSGI mod_psgi Perlbal
  62. PSGI adaptation
  63. Maypole Mason Mojo Sledge Catalyst 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 Amon Apache2::WebApp Web::Simple Apache2::REST SweetPea Hydrant Titanium
  64. Maypole Mason Mojo Sledge Catalyst 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 Amon Apache2::WebApp Web::Simple Apache2::REST SweetPea Hydrant Titanium
  65. Applications Movable Type 6, WebGUI 8
  66. # Catalyst use MyApp; MyApp->setup_engine(‘PSGI’); my $app = sub { MyApp->run(@_) }; # $app is a PSGI app!
  67. # Jifty use MyPonyApp; my $app = MyPonyApp->psgi_app; # $app is a PSGI app!
  68. # Dancer use Dancer; get ‘/’ => sub { “Hello World”; }; dance; # returns a PSGI app!
  69. # Mojolicious::Lite use Mojolicious::Lite; get ‘/:name’ => sub { my $self = shift; $self->render_text(‘Hello!’); }; app->start; # returns PSGI app
  70. # Web::Simple use Web::Simple ‘MyApp’; package MyApp; dispatch { sub(GET) { [ 200, [...], [ ‘Hello’ ] ]; } }; my $app = MyApp->as_psgi; # $app is a PSGI app!
  71. perldoc PSGI If you want to adapt your framework to PSGI.
  72. Plack “PSGI toolkit”
  73. HTTP::Server::PSGI Reference PSGI web server bundled in Plack
  74. Plackup Runs PSGI app instantly from CLI (inspired by rackup)
  75. > plackup app.psgi
  76. Plack::Handler Connects PSGI apps to Web servers CGI, FastCGI, Apache, SCGI
  77. PSGI Web Servers
  78. Starman UNIX Preforking HTTP servers (like Unicorn.rb) HTTP/1.1 chunk + keep-alives / Very Fast
  79. Starlet Simpler UNIX HTTP/1.0 Server Best used with Server::Starter and nginx/lighttpd
  80. Twiggy Non-blocking web server (like Thin.rb) based on AnyEvent framework
  81. Corona Coroutine for each connection based on Coro.pm
  82. HTTP::Server::Simple::PSGI Zero-deps other than HTTP::Server::Simple Best for embedding PSGI applications
  83. uWSGI http://projects.unbit.it/uwsgi/
  84. Perlbal plugin http://github.com/miyagawa/Perlbal-Plugin-PSGI
  85. nginx embedded perl http://github.com/yappo/nginx-psgi-patchs
  86. mod_psgi http://github.com/spiritloose/mod_psgi
  87. evpsgi http://github.com/sekimura/evpsgi
  88. Feersum http://github.com/stash/Feersum
  89. Catalyst CGI::App Jifty Tatsumaki Plack::Middleware PSGI Plack::Handler::* (CGI, FCGI, Apache) Apache lighttpd HTTP::Server::PSGI mod_psgi Perlbal Starman Twiggy uWSGI Corona evpsgi
  90. Middleware
  91. PSGI Middleware Wraps a PSGI application to add pre/post processing
  92. my $app = sub { my $env = shift; return [ $status, $header, $body ]; }; my $mw = sub { my $env = shift; # do something with $env my $res = $app->($env); # do something with $res; return $res; };
  93. PSGI Middleware coderef -> coderef Higher-order functions
  94. Middleware Debug, Session, Logger, Runtime, Static, Lint, AccessLog, ConditionalGET, ErrorDocument, StackTrace, Auth::Basic, Auth::Digest, ReverseProxy, Refresh, Auth::OAuth, Hippie, Throttle
  95. Plack::Middleware reusable and extensible Middleware framework Plack::Builder DSL in .psgi
  96. my $app = sub { return [ $status, $header, $body ]; }; use Plack::Builder; builder { enable “Static”, root => “/htdocs”, path => qr!^/static/!; enable “Deflater”; # gzip/deflate $app; }
  97. plackup compatible plackup -e ‘enable “Foo”;’ app.psgi
  98. Middleware Write once, run in every framework
  99. DEMO
  100. Plack::App::URLMap Multiplex multiple apps Integrated with Builder DSL
  101. use CatApp; use CGIApp; my $c1 = sub { CatApp->run }; my $c2 = sub { CGIApp->run_psgi }; use Plack::Builder; builder { mount “/cat” => $c1; mount “/cgi-app” => builder { enable “StackTrace”; $c2; }; }
  102. CGI::PSGI Easy migration from CGI.pm
  103. CGI::Emulate::PSGI CGI::Compile Easiest migration from CGI scripts (like Registry)
  104. Plack::Request like libapreq (Apache::Request) wrapper APIs for middleware developers
  105. Plack::Test Unified interface to write tests with Mock HTTP and Live HTTP
  106. use Plack::Test; use HTTP::Request::Common; my $app = sub { my $env = shift; return [ $status, $header, $body ]; }; test_psgi app => $app, client => sub { my $cb = shift; my $req = GET “http://localhost/foo”; my $res = $cb->($req); # test $res; };
  107. use Plack::Test; use HTTP::Request::Common; $Plack::Test::Impl = “Server”; my $app = sub { my $env = shift; return [ $status, $header, $body ]; }; test_psgi app => $app, client => sub { my $cb = shift; my $req = GET “http://localhost/foo”; my $res = $cb->($req); # test $res; };
  108. Plack::App::* ready-to-use applications
  109. Plack::App::Directory Static content file server
  110. Plack::App::Proxy (non-blocking) proxy server Can be used as reverse proxy as well
  111. Plack::App::CGIBin mount /cgi-bin as PSGI applications
  112. Plack::App::FCGIDispatcher Connect to FCGI daemon (even in Ruby, Python, C)
  113. Plack::App::JSP Runs JavaScript PSGI apps :)
  114. Testimonials a.k.a. self-promotion
  115. “I love this! It’s exactly the right answer to what i was looking for.” - Benjamin Trott
  116. “Wow, this is nothing short of awesome.” - Stevan Little
  117. “Plack is so simple, easy and powerful.” - Jesse Vincent
  118. “Plack rocks. Miyagawa rocks.” - Piers Cawley
  119. “Is he on too many drugs or too few? Either way let’s make sure that never changes.” - Matt S.Trout
  120. Real World Plack/PSGI
  121. You should join!
  122. > cpanm Plack > cpanm Task::Plack
  123. Cloud? (Heroku, GAE)
  124. Sunaba http://sunaba.plackperl.org/
  125. Runs on dankogai’s Sandbox
  126. You can even try: system(“rm -fr /”); while (1) { }
  127. Summary • PSGI is an interface, Plack is the code. • We have many (pretty fast) PSGI servers. • We have adapters and tools for most web frameworks. • Use it!
  128. Remember: Plack is < 1y old
  129. Lots of (exciting) things going on.
  130. http://blog.plackperl.org/
  131. http://github.com/miyagawa/Plack http://plackperl.org/ irc://irc.perl.org/#plack
  132. Questions?
  133. Thank you! Slides: http://slideshare.net/miyagawa

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