[dancer-users] Dancer 1 FCGI deployment quandry - solved

[Joel Roth]

Hi List,

Searching through the Dancer sources, I find that
bin/dancer, the app generator utility, installs a
dispatch.fcgi.  Having duly run bin/dancer, I have generated
a public/dispatch.fcgi that I can assume will solve my
problem.

It seems possible possible that dispatch.fcgi could get mangled
somehow, and also possible that not everyone who maintains a
Dancer deployment will have experience creating a site with
bin/dancer.

I think that including the short code for dispatch.fcgi (and
dispatch.cgi) in Dancer::Deployment would help someone
troubleshooting (would have helped me today), and would be
useful as a reference. 
 

On Tue, Nov 14, 2017 at 11:17:49AM -1000, Joel Roth wrote:
> 
> Hi List,
> 
> I have a web application at Dreamhost.com that I'm 
> trying to convert to fastcgi. Under CGI, the application
> runs via perlbrew using a self-compiled perl. 
> 
> In the Apache 2 error log, I'm getting 
> 
> 	[Mon Nov 13 13:31:53 2017] [error] [client 98.150.189.73] Premature end of script headers: dispatch.fcgi
> 
> When I run the script dispatch.fcgi, it brings up the Dancer HTTP server:
> 
> 	HTTP::Server::PSGI: Accepting connections at http://0:5000/
> 
> From the Dreamhost docs[1,2] and using the supplied test
> script, I don't need to modify the Apache configuration.
> The only changes I made to the original dispatch.cgi --
> gleaned from Dancer::Deployment -- were updating the script
> name and mod_rewrite rule.
> 
> File listings that make up my deployment follow. I don't
> grok is how running dispatch.fcgi, which ends in an 'exec',
> relates to an existing, persistent Dancer process. Perhaps
> Plack::Runner->run() should receive a coderef rather than a
> filename? I tried, but received the same the error message.
> I greatly welcome any suggestions!
> 
> 1.  https://help.dreamhost.com/hc/en-us/articles/217298967-FastCGI-overview
> 2.  https://help.dreamhost.com/hc/en-us/articles/216512598-Perl-overview
> 
> 
> cd dev.childspacemethod.com
> ls -l
> -rwxrwxr-x 1 childspace pg2527812  81 Nov 13 13:33 dispatch.fcgi
> -rw-r--r-- 1 childspace pg2527812 157 Nov 13 12:40 .htaccess
> -rwxrwxr-x 1 childspace pg2527812 155 Nov 13 12:47 plack_runner.pl
> 
> cat .htaccess
> 
> 	# BEGIN dancer application htaccess
> 	RewriteEngine On
> 	RewriteCond %{REQUEST_FILENAME} !-f
> 	RewriteRule (.*) dispatch.fcgi/$1
> 	# END dancer application htaccess
> 
> cat dispatch.fcgi
> 
> 	#!/bin/sh
> 	source ~/.bashrc
> 	perlbrew use 5.16.3
> 	exec `dirname $0`/plack_runner.pl
> 
> cat plack_runner.pl
> 
>     #!/usr/bin/env perl
> 	use Modern::Perl;
> 	use Plack::Runner;
> 	use autodie;
> 	chdir '/home/childspace/dev';
> 	Plack::Runner->run('dance.psgi');
> 
> cat /home/childspace/dev/dance.psgi
> 
> 	#!/usr/bin/env perl
> 	BEGIN { push @ARGV, qw(--environment=production) }
> 	use Modern::Perl;
> 	use Dancer;
> 	load_app 'Training::Resources';
> 	dance;


-- 
Joel Roth