June 2011 - dancer-users - lists.preshweb.co.uk

Dancer::plugin:ajax & config:load
by Stephen Fenwick-Paul 18 Jul '11

18 Jul '11

Hi, V. simple app: package MyApp; use Dancer ':syntax'; use Dancer::Plugin::Ajax; ajax '/hellox/:name' => sub { template 'hello'; }; true; Produces: $ curl -H 'X-Requested-With: XMLHttpRequest' http://www.myapp.new/hellox/fred *<p>This is hello</p>* * * Which is to be expected. But: package MyApp; use Dancer ':syntax'; use Dancer::Plugin::Ajax; ajax '/hellox/:name' => sub { * Dancer::Config::setting('appdir',$ENV{ROOT});* * Dancer::Config::load();* template 'hello'; }; true; $ curl -H 'X-Requested-With: XMLHttpRequest' http://www.myapp.new/hellox/fred Produces: *<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"* *"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">* *<html xmlns="http://www.w3.org/1999/xhtml">* *<head></head>* *<body>* * * *<p>This is hello</p>* * * *</body>* *</html>* So, running *Dancer::Config::load() *stops Plugin::Ajax working. This may seems a strange thing to do, but for me the load() was deep in a module that some times runs outside of Dancer but picks up stuff from the Dancer config. Handling the ajax call manually (as per the the Cookbox) there are no problems with using load(). Stephen

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Dancer, Apache & Mason deployment problem
by Stephen Fenwick-Paul 08 Jul '11

08 Jul '11

Hi, I'm new to Dancer and having moved from HTML::Mason I'm much impressed, but I'm having deployment problems. This is my apache.conf PerlModule Dancer::Template::Mason2 <VirtualHost *:80> DocumentRoot path_t_app ServerName www.test.new <Location /> SetHandler perl-script PerlHandler Plack::Handler::Apache2 PerlResponseHandler Plack::Handler::Apache2 PerlSetVar psgi_app path_to_app/bin/app.pl </Location> </VirtualHost> Nothing unusual in Apache logs on start up. But when access the site I get: * CODE(0x7f7bdc4aba50) not memoized at /usr/share/perl/5.10/Memoize.pm line 204.* /usr/share/perl/5.10/Memoize.pm around line 204 201 sub flush_cache {202 my $func = _make_cref($_[0], scalar caller);203 my $info = $memotable{$revmemotable{$func}};204 die "$func not memoized" unless defined $info;205 for my $context (qw(S L)) {206 my $cache = $info->{$context};207 if (tied %$cache && ! (tied %$cache)->can('CLEAR')) { Stack main in -e l. 0 main in -e l. 0 Plack::Handler::Apache2 in /usr/local/share/perl/5.10.1/Plack/Handler/Apache2.pm l. 86 Plack::Handler::Apache2 in /usr/local/share/perl/5.10.1/Plack/Handler/Apache2.pm l. 65 Dancer::Handler in /usr/local/share/perl/5.10.1/Dancer/Handler.pm l. 102 Dancer::Handler in /usr/local/share/perl/5.10.1/Dancer/Handler.pm l. 71 Dancer::Handler in /usr/local/share/perl/5.10.1/Dancer/Handler.pm l. 87 Dancer::Object in /usr/local/share/perl/5.10.1/Dancer/Object.pm l. 15 Dancer::Error in /usr/local/share/perl/5.10.1/Dancer/Error.pm l. 34 Dancer::Error in /usr/local/share/perl/5.10.1/Dancer/Error.pm l. 248 In standalone mode and using apache as local proxy everything works fine. If I remove "PerlModule Dancer::Template::Mason2" from the config, the server starts, the web apage partially renders but I get: "unknown template engine 'mason2', perhaps you need to install Dancer::Template::Mason2? at /usr/local/share/perl/5.10.1/Dancer/Template.pm line 17" I have latest version of Dancer & Mason modules. Does any one understand what I'm doing wrong? Thanks Stephen

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Lightning talk
by Jonathan Hogue 03 Jul '11

03 Jul '11

If you are at yapc, please, oh please, sign up to do a lightning talk. Dancer is cool, and a lot of people don't know about it. Might be too late, but with some support, I bet you can still get on the bill. (i would, but spoke already)

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May I have some help with issue #561
by Brian E. Lozier 29 Jun '11

29 Jun '11

Issue #561 ( https://github.com/sukria/Dancer/issues/561 ) is really killing me and due to the design of Dancer I can't find a simple way around it. The crux of the issue is that in Dancer::Factory::Hooks all the hooks get executed and their return values aren't checked. The hooks are initially compiled in Dancer::Hook and they are compiled wrapped in an eval such that if an exception occurs the hook returns a Dancer::halt which in turns wraps a Dancer::Response object that wraps an error render. Unfortunately nothing is ever done with this error render and I don't see a standard way to actually "halt" processing. If an exception occurs in a hook we should never ignore it and continue processing the rest of the page! We should die immediately and print an error message to the screen. The Dancer::halt method just returns a Dancer::Response object, it doesn't actually stop processing. As it works now, the returned Dancer::Response object is (almost) completely ignored. In fact the status code gets persisted to the actual Dancer::Response that is served (500) but the page renders normally otherwise. We are so deep in the call stack when hooks are executed that it's impossible to have any meaningful "return" value (unless someone goes in to every place "execute_hooks" is called and actually checks for errors -- in this case it would have to check for Dancer::Response objects). Is there a method somewhere that really halts instead of just returning a Dancer::Response object? Is there an accepted way to short-circuit the rest of the request handling? Thanks, Brian

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Slides, articles and blog posts about dancer
by Gabor Szabo 28 Jun '11

28 Jun '11

Hi, I think once I alrady mentioned this but maybe it was on the IRC channel when no one was looking. Or maybe it was in e-mail but I could not check the archives as http://lists.perldancer.org/pipermail/dancer-users/ does not answer me. I think it would be nice if there were links from the Dancer home page to pages talking about Dancer. E.g. to slides showing Dancer, blog posts and articles written about Dancer, videos and screencasts about Dancer etc. e.g. I just saw this: http://ajct.info/2011/05/17/dancing-in-the-clouds.html Oh I just Ducked for "perl dancer slides" and I found this page: http://perldancer.org/slides but I could not find it from the main page of Dancer. I might have missed the link. regards Gabor

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Where do I get POST form data in a post route?
by Leandro Hermida 26 Jun '11

26 Jun '11

Hi again, Sorry another newbie question, in a post route where do I get the POST form data? A la the CGI.pm $cgi->Vars hash thanks again, Leandro

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Re: [Dancer-users] Where do I get POST form data in a post route?
by Leandro Hermida 25 Jun '11

25 Jun '11

Hi, Just want to say thanks for the email replies to help, it was actually really straightforward to take existing CGI.pm scripts and migrate them to the Dancer framework, for the first major step simply copying the CGI code as is into Dancer routes and changing obvious things like: - print $html --> return $html - $cgi->params --> params - print $cgi->redirect(...) --> redirect '...' - print $cgi->header(...) --> headers '...' After these small changes everything works just like it did before and you can use the web app as is. As a next step I have to start using the templating and layout functionality and all the other nice features. thanks again, Leandro On Fri, Jun 24, 2011 at 5:02 PM, Leandro Hermida <softdev(a)leandrohermida.com > wrote: > Hi again, > > I've done what I wrote above with headers just before returning the data > file string and it works perfectly :) > > thanks, > Leandro > > > On Fri, Jun 24, 2011 at 4:30 PM, Maurice Mengel <mauricemengel(a)gmail.com>wrote: > >> there is are two related Dancer keywords: header and a headers >> >> http://search.cpan.org/~sukria/Dancer-1.3060/lib/Dancer.pm#headers >> >> sorry no time to answer properly. >> >> have never used it myself. >> >> >> On Fri, Jun 24, 2011 at 4:06 PM, Leandro Hermida >> <softdev(a)leandrohermida.com> wrote: >> > Crap hit send before finished >> > >> > On Fri, Jun 24, 2011 at 4:05 PM, Leandro Hermida >> > <softdev(a)leandrohermida.com> wrote: >> >> >> >> Hi thank you for the feeback, >> >> >> >> What I would like to do as I have in my old CGI.pm scripts would be >> >> translated as following in Dancer: >> >> >> >> get '/data/:id' => sub { >> >> # preexisting code here to get $file_data into variable from DB or >> >> whereever for a specified :id (already have this as is no need to >> change) >> >> # --> want to set right here before returning $file_data the right >> >> headers using some Dancer commands, particularly how do I set >> >> content_disposition? >> >> # --> want to also make sure if Dancer set some headers by default >> >> that I don't want that they are removed >> >> return $file_data; >> >> }; >> >> >> >> How would one using Dancer do the --> parts? Is it literally: >> >> >> >> headers 'Conten-type ' => 'text/plain', X-Bar => 'foo'; >> >> >> >> >> > >> > headers 'Content-type' => 'text/plain', 'Encoding' => 'utf-8', >> > 'Content-disposition' => 'inline; filename=myfile.txt'; >> > >> > >> >> >> >> best, >> >> Leandro >> >> >> >> On Fri, Jun 24, 2011 at 3:52 PM, Maurice Mengel < >> mauricemengel(a)gmail.com> >> >> wrote: >> >>> >> >>> I have an dancer application that outputs xml. I set mime default in >> >>> config.yml to txt/html to serve static pages and use >> >>> mime to set the mime type, see >> >>> http://search.cpan.org/~sukria/Dancer-1.3060/lib/Dancer.pm#mime for >> >>> that route. >> >>> >> >>> I return data in utf-8 via dancer as normal. UTF-8 should work now in >> >>> Dancer. >> >>> >> >>> My guess is that you can use Dancer::FileUtils if you to load files >> >>> and munge them before serving. If you don't want munge them you should >> >>> be able to serve them directly as static files from the public >> >>> directory. >> >>> >> >>> >> >>> >> >>> On Fri, Jun 24, 2011 at 3:44 PM, Leandro Hermida >> >>> <softdev(a)leandrohermida.com> wrote: >> >>> > Hi everyone, >> >>> > >> >>> > Thanks for all the help, my bad :) I had quickly read the Dancer >> Intro >> >>> > and >> >>> > Tutorial but not the Cookbook as I thought that would come later. >> It's >> >>> > actually very quick to move the CGI.pm scripts to Dancer I already >> have >> >>> > all >> >>> > the GETs working for HTML and now the form POSTs. >> >>> > >> >>> > Another question, I had a couple CGI scripts which would return >> >>> > non-HTML, >> >>> > e.g. like retrieve a data file... this would require printing in CGI >> a >> >>> > specific header before the content body e.g. >> >>> > >> >>> > $cgi->header(-type => 'text/plain', >> >>> > -charset => 'utf-8', >> >>> > -encoding => 'utf-8', >> >>> > -content_disposition => "inline; >> >>> > filename=$filename"), >> >>> > >> >>> > How do I set such headers in Dancer, removing any default headers >> >>> > Dancer has >> >>> > already has set? I looked at header and headers but don't >> completely >> >>> > understand whether it removes all the preexisting headers Dancer had >> >>> > set for >> >>> > me. >> >>> > >> >>> > best, >> >>> > Leandro >> >>> > >> >>> > On Fri, Jun 24, 2011 at 3:32 PM, Maurice Mengel >> >>> > <mauricemengel(a)gmail.com> >> >>> > wrote: >> >>> >> >> >>> >> Dancer::Cookbook describes like this. (Maybe we should add a code >> >>> >> example >> >>> >> there) >> >>> >> >> >>> >> > Retrieving request parameters >> >>> >> > The params method returns a hashref of request parameters; these >> >>> >> > will be >> >>> >> > parameters supplied on the query string, within the path itself >> >>> >> > (with named >> >>> >> > placeholders), and, for HTTTP POST requests, the content of the >> POST >> >>> >> > body. >> >>> >> >> >>> >> For examples: >> >>> >> >> >>> >> http://advent.perldancer.org/2010 >> >>> >> >> >>> >> e.g. the third 3 example. >> >>> >> >> >>> >> which has the example for accessing post variables via >> >>> >> params->{'title'}, >> >>> >> params->{'text'} >> >>> >> >> >>> >> @ambs: >> >>> >> >> >>> >> $hash = params; >> >>> >> >> >>> >> might better be written as >> >>> >> $hashref = params; >> >>> >> or even >> >>> >> $hashref = params(); >> >>> >> >> >>> >> but probabily it doesn't matter that much ;-) >> >>> >> >> >>> >> maurice >> >>> >> >> >>> >> >> >>> >> On Fri, Jun 24, 2011 at 3:22 PM, Leandro Hermida >> >>> >> <softdev(a)leandrohermida.com> wrote: >> >>> >> > Hi again, >> >>> >> > >> >>> >> > Sorry another newbie question, in a post route where do I get the >> >>> >> > POST >> >>> >> > form >> >>> >> > data? A la the CGI.pm $cgi->Vars hash >> >>> >> > >> >>> >> > thanks again, >> >>> >> > Leandro >> >>> >> > >> >>> >> > >> >>> >> > _______________________________________________ >> >>> >> > Dancer-users mailing list >> >>> >> > Dancer-users(a)perldancer.org >> >>> >> > http://www.backup-manager.org/cgi-bin/listinfo/dancer-users >> >>> >> > >> >>> >> > >> >>> > >> >>> > >> >> >> > >> > >> > >

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Re: [Dancer-users] Get the Host that I am running under
by Gurunandan Bhat 24 Jun '11

24 Jun '11

That, I was not aware of. Thank you for pointing it out. On Fri, Jun 24, 2011 at 7:33 PM, Alex Kalderimis <alex(a)intermine.org> wrote: > On Fri, Jun 24, 2011 at 07:30:59PM +0530, Gurunandan Bhat wrote: > > I need to send the public facing URL of the application in an email to > > confirm registration > > > > Thanks > > Again, there uri_for is your friend, as any uri, even the > application's root uri can be constructed. > > Alex > > > > > > > On Fri, Jun 24, 2011 at 7:23 PM, Stefan Hornburg (Racke) > > <racke(a)linuxia.de>wrote: > > > > > On 06/24/2011 03:43 PM, Gurunandan Bhat wrote: > > > > > >> Hi, > > >> > > >> I am currently fetching the host my application is running under by > > >> fetching > > >> $ENV{HTTP_HOST} inside a route handler. Very soon, I plan to host this > > >> behind Apache with mod_proxy. > > >> > > >> How can I get the hostname of the proxy when that happens? > > >> > > >> > > > Why do you need the hostname at all? > > > > > > If everything is configured correctly as described in > Dancer::Deployment > > > and > > > Dancer::Config (behind_proxy), you can construct URLs for redirects and > > > such > > > with uri_for. > > > > > > Regards > > > Racke > > > > > > -- > > > LinuXia Systems => http://www.linuxia.de/ > > > Expert Interchange Consulting and System Administration > > > ICDEVGROUP => http://www.icdevgroup.org/ > > > Interchange Development Team > > > > > > > > > ______________________________**_________________ > > > Dancer-users mailing list > > > Dancer-users(a)perldancer.org > > > http://www.backup-manager.org/**cgi-bin/listinfo/dancer-users< > http://www.backup-manager.org/cgi-bin/listinfo/dancer-users> > > > > > > _______________________________________________ > > Dancer-users mailing list > > Dancer-users(a)perldancer.org > > http://www.backup-manager.org/cgi-bin/listinfo/dancer-users > >

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Get the Host that I am running under
by Gurunandan Bhat 24 Jun '11

24 Jun '11

Hi, I am currently fetching the host my application is running under by fetching $ENV{HTTP_HOST} inside a route handler. Very soon, I plan to host this behind Apache with mod_proxy. How can I get the hostname of the proxy when that happens? Thanks

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getting existing CGI.pm scripts to work under Dancer
by Leandro Hermida 24 Jun '11

24 Jun '11

Hi everyone, I'm new to Dancer and to this list, happy very happy to now have a chance to learn and use Dancer at work. I have an existing app which is CGI.pm script-based and was wondering what is the best way as a first step to get these scripts to work under Dancer? regards, Leandro

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