The document discusses various web application frameworks and deployment methods in Perl. It covers common frameworks like CGI, mod_perl, Catalyst, and PSGI. It then discusses running PSGI applications with plackup, configuring middleware, and deploying PSGI apps behind web servers or as standalone daemons. Finally, it briefly covers application deployment and management with tools like daemontools.

20. CGI
mod_perl
Catalyst FastCGI
standalone
CGI
mod_perl
Jifty FastCGI
standalone

21. Catalyst
CGI
mod_perl
PSGI Adaptor
FastCGI
standalone
Jifty

29. use strict;
sub psgi_app {
my $env = shift;
return [
200,
[ "Content-Type" => "text/plain" ],
[ "Hello, ", "World!" ]
];
}
# .psgi
&psgi_app;

30. use strict;
use File::Spec;
sub psgi_app {
my $env = shift;
my $path = File::Spec->catfile( "/path/to/docs", $env->{PATH_INFO} );
if (-f $path) {
my $fh;
if (! open( $fh, '<', $path ) ) {
return [
500, [ "Content-Type" => "text/plain" ], [ "Server Error" ]
];
}
return [ 200, [ "Content-Type" => "text/plain" ], $fh ];
} else {
return [ 404, [ "Content-Type" => "text/plain" ], [ "File not found" ] ];
}
}
# .psgi
&psgi_app;

36. > plackup -a myapp.psgi
HTTP::Server::PSGI: Accepting connections at http://
0:5000/

38. > plackup -a myapp.psgi
-s HANDLER

39. > plackup -a myapp.psgi
-E ENV

40. > plackup -a myapp.psgi
-S /path/to/socket

41. > plackup -e “sub { ... }”
-I/path/to/lib
-MModuleName

43. # Apache2
<Location />
SetHandler perl-script
PerlResponseHandler Plack::Handler::Apache2
PerlSetVar psgi_app /path/to/app.psgi
</Location>

44. # Run as a standalone daemon
plackup -s FCGI
--listen /tmp/fcgi.sock
--daemonize
--nproc 10

45. #!/usr/bin/env plackup
... CGI code ...

53. # myapp.psgi
use strict;
use Plack::Middleware::Foo;
use Plack::Middleware::Bar;
use Plack::Middleware::Baz;
my $app = sub { ... };
$app = Plack::Middlewre::Foo->wrap($app);
$app = Plack::Middlewre::Bar->wrap($app);
$app = Plack::Middlewre::Baz->wrap($app);
$app;

54. # myapp.psgi
use strict;
use Plack::Middleware::Foo;
use Plack::Middleware::Bar;
use Plack::Middleware::Baz;
my $app = sub { ... };
$app = Plack::Middlewre::Foo->wrap($app);
$app = Plack::Middlewre::Bar->wrap($app);
$app = Plack::Middlewre::Baz->wrap($app);
$app;

55. # myapp.psgi
use strict;
use Plack::Builder;
builder {
enable "Foo";
enable "Bar";
enable "Bar";
sub { [
200,
[ "Content-Type" => "text/plain" ],
[ "Hello World" ]
};
};

67. #!/usr/bin/env perl
use strict;
use warnings;
use MyApp;
MyApp->setup_engine('PSGI');
my $app = sub { MyApp->run(@_) };

71. use strict;
use AnyEvent;
sub {
my $env = shift;
#
return sub {
my $start_response = shift;
my $writer = $start_response->([
200,
[ "Content-Type" => "text/plain" ]
]);
my $count = 1;
my $w; $w = AE::timer 1, 10, sub {
$writer->write( "Timer $countn" );
if ($count++ > 10) {
undef $w;
}
};
}
}

72. Q4M
App
client client client client

73. Event Server
Q4M
App
client client client client

75. use strict;
use Plack::Request;
sub {
my $env = shift;
my $req = Plack::Request->new( $env );
my $path = $req->path_info;
my $param = $req->parma('param');
my $res = $req->new_response( 200 );
return $res->finalize();
};

81. accept
app
listen
spawn

82. accept
app
listen
spawn

83. accept
app
listen
spawn
accept
app

84. accept
app
listen
spawn
accept
app

85. listen
spawn
accept
app

86. start_server --port=80
plackup -a myapp.psgi -s Starman

89. /var/lib/mycompany/sitename.mycompany.com/MyApp
/etc/service/sitename.mycompany.com
run ( MyApp/deploy/run
config.yaml
env/
logs

91. AppX lib
extlib Catalyst 5.7
AppY lib
extlib Catalyst 5.8

93. cpanm --installdeps --local-lib-contained=extlib .

95. http://github.com/lestrrat/daemontools-plack-runner

98. daemontools
Server::Starter
perl extlib
plackup
myapp.psgi Framework