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

dancer book?
by Ken Peng 11 Sep '15

11 Sep '15

Hi, I have wrote some code with Perl and Dancer, they work fine. Now I want to take a deep look at this framework. I searched but have no luck for finding a special book about Dancer. Have you known anyone? Thanks. -- B. Regards, Ken Peng - ken(a)cloud-china.org

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interpolate a Javascript variable as to assign it's value to a TT variable
by Nikos Vaggalis 08 Sep '15

08 Sep '15

More educational value out of this question than a practical one Is it possible to interpolate a Javascript variable as to assign it's value to a TT variable? The scenario would be that from within the materialized template to extract value pairs from DOM elements like sliders,select groups etc,serialize them and save the resulting string into a cookie: <script> var getvalue = $( "#Brand").find(":selected").parent("optgroup").attr("label"); jsvar = {Brand:getvalue}; jsvar = JSON.strignify(jsvar); [% SET session.ttvar= jsvar ]% </script> Imagine going through a series of elements,capturing the values which can be used later on as parameters to a POST call i.e {Brand:...,Price_from....,Price_to:...} since they would be saved in a cookie which would be valid for the rest of the session, they could be reused by the same or another route for purposes of for example reinstating or remembering the previous state after the back button of the browser is hit Of course, that could be done with an Ajax call but been thinking of alternative ways So the problem here is how do you escape out of the TT context and inject temporary Javascript context in [% SET session.ttvar= jsvar %] ,so that jsvar gets assigned to ttvar ?

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Trial bugfix release of Dancer 1 on its way to CPAN
by Yanick Champoux 07 Sep '15

07 Sep '15

Hi all, A small bugfix release of Dancer 1 has been punted to CPAN. As usual, if nothing horrid is reported within 5 days, it'll be promoted to a stable release. Also as usual, thanks to all involved. Y'all rock harder than Hawaiian volcanos. Joy, `/anick 1.3141 2015-09-07 [ BUG FIXES ] - Dancer::Logger::Abstract now always try to convert to the configured charset. (GH#1125, ironcamel) - Fix test that was failing on Windows because of platform-specific directory separators. (GH#1122, nanis) [ STATISTICS ] - code churn: 11 files changed, 52 insertions(+), 37 deletions(-)

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Digest Authentication and Plack::Test and get the user in Dancer2
by Arjan Widlak 06 Sep '15

06 Sep '15

Hi, Is it possible to test Digest Authentication with Plack::Test without starting a live server? With a live server I can do this: | my $browser = LWP::UserAgent->new();|| || $req = HTTP::Request->new( GET => 'http://localhost:5000/' );|| || $browser->credentials(|| || "localhost:5000",|| || "ZZZZZZ",|| || 'arjan(a)xxxxxx.nl' => 'xxxxxx'|| || );|||| || $res = $browser->request( $req );|| || ok( $res->status_line eq '200 OK', 'success with login with credentials' );| And in my Dancer2 app I get: |get '/' => sub {|| || my $dsl = shift;|| || my $user = $dsl->app->request->user;| Is it possible to do something like: my $test = Plack::Test->create($app); |my $req = GET '/mYtQ2EeQthcclMhsqDZTbVcggwX9kJDo';|| ||$req->header( "Accept" => "application/json" );|| ||$req->header( "Host" => "localhost" );|| ||$req->header( "Authorization" => 'Digest username="arjan(a)xxxxxx.nl",|| || realm="ZZZZZZ",|| ||nonce="dcd98b7102dd2f0e8b11d0f600bfb0c093",|| || uri="/",|| || qop=auth,|| || nc=00000001,|| || cnonce="0a4f113b",|| ||response="6629fae49393a05397450978507c4ef1",|| ||opaque="5ccc069c403ebaf9f0171e9517f40e41"');|| ||my $res = $test->request( $req );| And get the user in Dancer2 in the same way: |get '/' => sub {|| || my $dsl = shift;|| || my $user = $dsl->app->request->user;| Where does Dancer2 get the user that is returned with $dsl->app->request->user? I had a hard time finding this in Dancer2::Core::Request.pm, where it's in the documentation. Kind regards, Arjan.

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New Dancer2 release en route to CPAN: 0.162000
by Sawyer X 06 Sep '15

06 Sep '15

Yet another Dancer2 release hitting CPAN as we speak, all the way from Granada, Spain, courtesy of YAPC::EU 2015. We've made a few interesting changes, highlights of which I would like to share with you. **Fixes** * Escaping file paths in regexes. * Handle response in before hook correctly when serializer available. * Correctly validate *all* options in route definition. * Custom error templates fixes, including in before hooks. * Unmask exceptions thrown by serializers. **Enhancements** * Major optimizations! Dancer 2 is now at least as fast as Dancer 1. We're continuing work on optimizing it. If you have use-cases you would like us to take a closer look at, just let us know! * Better stack trace display. * Correctly set response content via "halt" keyword. * Switch to HTML5 templates! * Streamline and optimize serializer helpers (`to_json`, `from_json`). **Thanks** We want to thank our lovely contributors for this release (in alphabetical order): A. Sinan Unur, Achilles Kars, Andy Beverley, Dmitrii Tcyganov, Gabor Szabo, Kadir, Nick Tonkin, Patrick Zimmermann, Tina Müller, Vernon, and, of course, our core devs involved in this release: Alberto Simões, Mickey Nasriachi, Russell Jenkins, Sawyer X. **Future plans** We intend to introduce one major change and deprecate unsafe behavior. We have a branch ready (which will be merged only *after* this release) that introduces three new keywords: `query_parameters`, `body_parameters`, and `route_parameters`. These will return values that make it unnecessary to validate whether you received a single value or multiple values. It's a change we've wanted to introduce for a while now. We also plan to deprecate the ability to set route parameters that undermine two specific features in route matching: splat/megasplat and regex captures. Unless you have `:splat` or `:captures` placeholder variables in your route definitions, you will not even notice. Have a great dance, :) Sawyer and the Dancer Core Dev Team.

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Image Uploader
by Richard Reina 06 Sep '15

06 Sep '15

I am following this youtube video to learn how to create an image upload form on a page -- which would allow a user to upload an image. About 6 minutes into the video it goes into using php. Does anyone know how I can do this in dancer2 so I won't have to uses php.

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GraphQL
by Daniel M. 01 Sep '15

01 Sep '15

Is there any group that may be considering a GraphQL implementation in Perl? I ask here because it seems like a natural fit. GraphQL | | | | | | | | | GraphQLGraphQL Working Draft – July 2015 Introduction | | | | View on facebook.github.io | Preview by Yahoo | | | | | https://facebook.github.io/graphql/Building a GraphQL Server with Node.js and SQL | | | | | | | | | | | Building a GraphQL Server with Node.js and SQLGraphQL is a new technology from Facebook. It aims to replace REST as a go-to API standard for developing rich applications. In this article we'll build a simple Gr... | | | | View on www.reindex.io | Preview by Yahoo | | | | |

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Getting Value of nested hash attributes -- HASH confusion
by Richard Reina 31 Aug '15

31 Aug '15

I have to following template that lists table data with a checkbox to the left and a text area to the right -- special thanks to Andrew for helping me figure out the HTML. The data comes from: my $q = "SELECT c.ID AS ID, u.screenname AS SNAME, a.name AS ANAME, a.descrip AS DESCRIP, c.season AS SSN, c.year AS YR, ch.name AS CHNAME FROM challenge c, accomp_type a, usuario u, jugador j, charity ch WHERE c.ACC_TYPE_ID=a.ID AND ch.ID=c.CHAR_ID AND c.PLR_ID=j.ID AND j.USER_ID=u.ID"; my $Chlngs = $dbh->selectall_hashref( $q, 'ID' ); <div class="container" style="margin-top:20px;"> <div class="row"> <div class="col-xs-12"> <form role="form" action="openchallenges" method="POST"> <h3 class="text-center">Open To Do</h3> <div class="well" style="max-height: 300px;overflow: auto;"> <ul class="list-group fancy-list-items">  <table style="width:100%"> <% FOREACH ID IN Chlngs.keys.sort %> <tr class="list-group-item"> <td width="5"> <input type="checkbox" name="<% Chlngs.$ ID.NAME %>"</input> </td> <td width="70"><% Chlngs.$ID.SNAME %></td> <td width="75"><% Chlngs.$ID.ANAME %></td> <td width="35"><% Chlngs.$ID.SSN %></td> <td width="35"><% Chlngs.$ID.YR %></td> <td width="250"><% Chlngs.$ID.CHNAME %></td> <td width="550"><% Chlngs.$ID.DESCRIP %></td> <td><input type="text" name="<% Chlngs.$ID.ID %>" size="8" </td> <% END %> </tr> </ul> </table> </div> <hr class="colorgraph"> <div class="row"> <div class="col-xs-12 col-md-12"><input type="submit" value="Submit" class="btn btn-primary btn-block btn-lg"></div> </form> </div> </div> </div> However, after getting the template to work I am once again stumped in how to capture the value of the dynamically named hash ref -- specifically the second one from the text box. I have tried various permutations below -- some of which were very graciously provided to me in an earlier similar thread -- but all seem to only give me either a hash reference, the value of ID or this error when I place the number 7 into the text field: Can't use string ("7") as a HASH ref while "strict refs" in use at /home/richard/Dancer2/MyApp/bin/../lib/MyApp.pm line 463. my $input_hash; foreach my $key ( keys %$Chlngs ) { print "Checking Chlgs: " . $key . " for value.\n"; if ( param( $key ) ) { # paramter has value #$input_hash->{ $key } = $Chlngs->{ $key }; $input_hash->{ $key } = param( $key ); #print $key, $input_hash->{ $key }, "\n"; #print %{ $input_hash->{1} }; print $input_hash->{1}{ID}, "\n"; # $sth->execute($PLR_ID, $key, $input_hash->{Season}, $input_hash->{Year}, $input_hash->{CharID}); } } Thanks for any help. Richard

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Migrating CGI.pm-based code to Dancer2
by Amelia Ireland 31 Aug '15

31 Aug '15

Hi Warren, Thank you for your response! *Warren Young* wyml at etr-usa.com <dancer-users%40dancer.pm?Subject=Re%3A%20%5Bdancer-users%5D%20Migrating%20CGI.pm-based%20code%20to%20Dancer2&In-Reply-To=%3CFA02293B-5F0E-4ADA-ABDA-DC3861003948%40etr-usa.com%3E> wrote: > On Aug 31, 2015, at 2:11 PM, Amelia Ireland <aireland at lbl.gov > <http://lists.preshweb.co.uk/mailman/listinfo/dancer-users>> wrote: > > > > > * 1) The old code is written in a "print as you go" form. * When I ran > into the same situation in my code base, I handled it like this: > my $html = “SOme stuff…”; > $html .= “More stuff…”; > …repeat until done :) … > return $html; > The tricky bit comes in translating things like this: > print “Some “, $rather, “ complicated “, code(); > You either end up replacing all the commas with dots or: > $html .= sprintf “Some “, …etc. > I'm doing that on a small scale where possible, but unfortunately the size and unfamiliarity of the codebase (I've only been working with it a couple of months) make this a daunting prospect. :-( Capturing STDOUT feels like a dirty solution--I'd much sooner the app returned data that could be used to populate templates--but it's really the only viable option at the moment. > > * 2) I'm converting the PSGI env into a CGI object using CGI::PSGI; apart > from HTTP headers, is there anything else I need to take care of? * I > wouldn’t keep trying to hold onto CGI. Dancer’s always-on route-based > processing method is quite different from CGI’s model. > Trying to program Dancer in a CGI-like fashion might make some things a > bit quicker to translate, but I think you’ll eat that savings up in areas > that don’t map easily, and in difficulty of understanding the final version > as it keeps jumping between the CGI and Dancer abstractions. I'd love to dispatch the CGI-based code elsewhere, but it's a big codebase and the cgi-based code is in production use, so my changes have to maintain compatibility with the existing cgi scripts. New code is written in the Dancer2 paradigm and the old code has a Dancer2 wrapper that handles authentication, sessions, etc. I'm hoping to convert my coworkers to Dancer2 once they see how neat and easy it is in comparison to CGI.pm... Amelia.

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Migrating CGI.pm-based code to Dancer2
by Amelia Ireland 31 Aug '15

31 Aug '15

Hello all, I'm attempting to merge an old CGI.pm-based code base into a Dancer2-powered app, and I have some questions. I had been running the old code using Plack::App::CGIBin to mount the .cgi files, but there is now enough code shared between the two that I am ready to merge the two. The shared code currently runs some preflight checks, and then parses the query params to figure out the correct modules to load and subroutine to dispatch. 1) The old code is written in a "print as you go" form. My initial idea was to capture the STDOUT, but unfortunately the code includes some hacks to keep the browser connection open when running long processes (rather than forking a child process and periodically checking on its process, using an event loop, etc.). There's lots of code like this: print "<p>Launching lengthy process...</p>"; my $data = do_something_that_takes_ages_here(); print "<p>Finished part one of lengthy process. Starting phase two!</p>"; I'd like to use Dancer2's streaming/async capabilities here but am not sure how to send what is printed to STDOUT to the 'content' keyword. Can anyone help? 2) I'm converting the PSGI env into a CGI object using CGI::PSGI; apart from HTTP headers, is there anything else I need to take care of? Thank you for any help and hints! Amelia.

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