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174 lines
5.3 KiB
174 lines
5.3 KiB
package CGI::Fast;
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# See the bottom of this file for the POD documentation. Search for the
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# string '=head'.
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# You can run this file through either pod2man or pod2html to produce pretty
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# documentation in manual or html file format (these utilities are part of the
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# Perl 5 distribution).
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# Copyright 1995,1996, Lincoln D. Stein. All rights reserved.
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# It may be used and modified freely, but I do request that this copyright
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# notice remain attached to the file. You may modify this module as you
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# wish, but if you redistribute a modified version, please attach a note
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# listing the modifications you have made.
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# The most recent version and complete docs are available at:
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# http://www.genome.wi.mit.edu/ftp/pub/software/WWW/cgi_docs.html
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# ftp://ftp-genome.wi.mit.edu/pub/software/WWW/
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$CGI::Fast::VERSION='1.01';
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use CGI;
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use FCGI;
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@ISA = ('CGI');
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# workaround for known bug in libfcgi
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while (($ignore) = each %ENV) { }
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# override the initialization behavior so that
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# state is NOT maintained between invocations
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sub save_request {
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# no-op
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}
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# New is slightly different in that it calls FCGI's
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# accept() method.
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sub new {
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my ($self, $initializer, @param) = @_;
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unless (defined $initializer) {
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return undef unless FCGI::accept() >= 0;
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}
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return $CGI::Q = $self->SUPER::new($initializer, @param);
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}
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1;
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=head1 NAME
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CGI::Fast - CGI Interface for Fast CGI
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=head1 SYNOPSIS
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use CGI::Fast qw(:standard);
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$COUNTER = 0;
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while (new CGI::Fast) {
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print header;
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print start_html("Fast CGI Rocks");
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print
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h1("Fast CGI Rocks"),
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"Invocation number ",b($COUNTER++),
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" PID ",b($$),".",
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hr;
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print end_html;
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}
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=head1 DESCRIPTION
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CGI::Fast is a subclass of the CGI object created by
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CGI.pm. It is specialized to work well with the Open Market
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FastCGI standard, which greatly speeds up CGI scripts by
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turning them into persistently running server processes. Scripts
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that perform time-consuming initialization processes, such as
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loading large modules or opening persistent database connections,
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will see large performance improvements.
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=head1 OTHER PIECES OF THE PUZZLE
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In order to use CGI::Fast you'll need a FastCGI-enabled Web
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server. Open Market's server is FastCGI-savvy. There are also
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freely redistributable FastCGI modules for NCSA httpd 1.5 and Apache.
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FastCGI-enabling modules for Microsoft Internet Information Server and
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Netscape Communications Server have been announced.
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In addition, you'll need a version of the Perl interpreter that has
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been linked with the FastCGI I/O library. Precompiled binaries are
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available for several platforms, including DEC Alpha, HP-UX and
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SPARC/Solaris, or you can rebuild Perl from source with patches
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provided in the FastCGI developer's kit. The FastCGI Perl interpreter
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can be used in place of your normal Perl without ill consequences.
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You can find FastCGI modules for Apache and NCSA httpd, precompiled
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Perl interpreters, and the FastCGI developer's kit all at URL:
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http://www.fastcgi.com/
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=head1 WRITING FASTCGI PERL SCRIPTS
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FastCGI scripts are persistent: one or more copies of the script
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are started up when the server initializes, and stay around until
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the server exits or they die a natural death. After performing
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whatever one-time initialization it needs, the script enters a
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loop waiting for incoming connections, processing the request, and
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waiting some more.
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A typical FastCGI script will look like this:
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#!/usr/local/bin/perl # must be a FastCGI version of perl!
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use CGI::Fast;
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&do_some_initialization();
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while ($q = new CGI::Fast) {
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&process_request($q);
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}
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Each time there's a new request, CGI::Fast returns a
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CGI object to your loop. The rest of the time your script
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waits in the call to new(). When the server requests that
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your script be terminated, new() will return undef. You can
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of course exit earlier if you choose. A new version of the
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script will be respawned to take its place (this may be
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necessary in order to avoid Perl memory leaks in long-running
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scripts).
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CGI.pm's default CGI object mode also works. Just modify the loop
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this way:
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while (new CGI::Fast) {
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&process_request;
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}
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Calls to header(), start_form(), etc. will all operate on the
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current request.
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=head1 INSTALLING FASTCGI SCRIPTS
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See the FastCGI developer's kit documentation for full details. On
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the Apache server, the following line must be added to srm.conf:
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AddType application/x-httpd-fcgi .fcgi
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FastCGI scripts must end in the extension .fcgi. For each script you
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install, you must add something like the following to srm.conf:
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AppClass /usr/etc/httpd/fcgi-bin/file_upload.fcgi -processes 2
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This instructs Apache to launch two copies of file_upload.fcgi at
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startup time.
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=head1 USING FASTCGI SCRIPTS AS CGI SCRIPTS
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Any script that works correctly as a FastCGI script will also work
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correctly when installed as a vanilla CGI script. However it will
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not see any performance benefit.
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=head1 CAVEATS
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I haven't tested this very much.
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=head1 AUTHOR INFORMATION
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Copyright 1996-1998, Lincoln D. Stein. All rights reserved.
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This library is free software; you can redistribute it and/or modify
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it under the same terms as Perl itself.
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Address bug reports and comments to: [email protected]
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=head1 BUGS
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This section intentionally left blank.
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=head1 SEE ALSO
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L<CGI::Carp>, L<CGI>
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=cut
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