April 2015 - dancer-users - lists.preshweb.co.uk

Can I convert App::Notifier::Service from Dancer 1 to Dancer2?
by Shlomi Fish 07 Aug '15

07 Aug '15

Hi all, Is there a good reason why I should *not* convert https://metacpan.org/pod/App::Notifier::Service from Dancer 1 to Dancer2? It's a simple web app, meant to run synchronously, and I can debug it by using perl -d, and last time I tried doing s/Dancer/Dancer2/g everything worked nicely. Is there a good enough reason to stay with Dancer 1? Regards, Shlomi Fish -- ----------------------------------------------------------------- Shlomi Fish http://www.shlomifish.org/ http://www.shlomifish.org/humour/bits/Can-I-SCO-Now/ - "Can I SCO Now?" If it isn’t in my email, it doesn’t exist. And if the whole world says one thing and my email says something different, email will conquer. — an Israeli Linuxer. Please reply to list if it's a mailing list post - http://shlom.in/reply .

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Trouble with DBIC in Plugins
by Matthew Mallard 04 May '15

04 May '15

Hi, I’m getting a bit confused with plugins. I’m sure that I was able to use the DBIC Plugin at one point from one of my plugins, but I can’t seem to get it to work in 0.159002 or 0.160000. DBIC seems to be okay outside of plugins. 3 questions: * why does it complain about "Plugin calls 'dsl' instead of '$dsl->dsl’" when I appear to be using '$dsl->dsl’? * how do I get DBIC to print the SQL it’s executing so I can double check it’s what I’m expecting? * am I doing something else wrong in the way I’m trying to use DBIC? Basically this is the code in my plugin: register get_topics => sub { my $dsl = shift; my $type = shift; my $application = shift; my $pageid = shift; my $dberr = 0; my $current; my $urlref; my $template = ""; my $id; my @topics; $dsl->debug( "**** Here 1 ****"); eval { @topics = $dsl->schema->resultset('ContentType')->search({ application => $application }, { prefetch => [ 'content_type_names' ], order_by => 'sort_order' }) }; $dberr += $dsl->check_db_result( $dsl, $@, __LINE__ ); $dsl->debug( "**** Here 2 **** " . @topics); etc, etc } The output in the console is this: [Routes:37674] core @2015-04-27 21:57:16> Entering hook core.app.before_request in (eval 87) l. 1 [Routes:37674] debug @2015-04-27 21:57:16> **** Here 1 **** in /code/Dancer/MediBase/bin/../lib/QTechLib/Plugin.pm l. 31 DEPRECATED: QTechLib::Plugin calls 'dsl' instead of '$dsl->dsl'. at /perf/perl/lib/perl5/Dancer2/Plugin/DBIC.pm line 13. [Routes:37674] debug @2015-04-27 21:57:16> ######Dancer2::Core::DSL__WITH__Dancer2::Plugin::DBIC__WITH__Dancer2::Plugin::Ajax__WITH__QTechLib::L12N::Plugin__WITH__QTechLib::Plugin=HASH(0x3a05a88)###### at line: in /code/Dancer/MediBase/bin/../lib/QTechLib/Plugin.pm l. 66 [Routes:37674] debug @2015-04-27 21:57:16> **** Here 2 **** in /code/Dancer/MediBase/bin/../lib/QTechLib/Plugin.pm l. 31 Here 2 should print the number of topics - which should be greater than zero. with thanks, Matt

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Dancer2 0.160000 en route to CPAN!
by Sawyer X 02 May '15

02 May '15

Hi everyone, I am proud to announce another release of Dancer2, carrying many changes and improvements, with 9 contributors and 21 tickets closed[1]. This release carries the following major changes: * Workaround for multiple plugins with hooks. * "send_file" is asynchronous by default. Fallback to synchronous. * "prefix" now supports the entire route path spec ("/:var" now works in prefix). * Clear up prefix inconsistencies ("/var" vs. "/var/"). * Proper package reported in logging. Thank you to everyone involved in this release, whether working on an issue or helping raise them and debug them, especially the following people (in order of appearance in the Changelog): cdmalon, Russell Jenkins, Alberto Simões, Sawyer X, Chenchen Zhao, Sakshee Vijayvargia, Andrew Solomon, David Zurborg, and valerycodes. The full Changelog for this release: [ BUG FIXES ] * GH #868: Fix incorrect access name in $error->throw. (cdmalon) * GH #879, #883: Fix version numbering in packaging and tests. (Russell Jenkins) * File serving (send_file) won't call serializer. (Russell Jenkins) * GH #892, #510: Workaround for multiple plugins with hooks. (Russell Jenkins, Alberto Simões) * GH #558: Remove "prefix" inconsistency with possibly missing postfixed forward slash. (Sawyer X) [ DOCUMENTATION ] * GH #816, #874 Document session engine changes in migration documentation. (Chenchen Zhao) * GH #866, #870: Clarify that you cannot forward to a static file, why, and two different ways of accomplishing it without forward. (Sakshee Vijayvargia) * GH #878: Rework example for optional named matching due to operator precedence. (Andrew Solomon) * GH #844: Document Simple session backend is the default. (Sawyer X) [ ENHANCEMENT ] * GH #869: Streaming file serving (send_file). (Russell Jenkins) * GH #793: "prefix" now supports the path definition spec. (Sawyer X) * GH #817, #845: Route spec under a prefix doesn't need to start with a slash (but must without a prefix). (Sawyer X, Russell Jenkins) * GH #871: Use Safe.pm instead of eval with Dancer2::Serializer::Dumper. (David Zurborg) * GH #880: Reduce and cleanup different logging calls in order to handle the stack frames traceback for logging classes. (Russell Jenkins) * GH #857, #875: When failing to render in Template::Toolkit, make the error reflect it's a TT error, not an internal one. (valerycodes) Sawyer, on behalf of the Dancer core developers team. [1] Only 20 tickets mentioned in the Changelog itself.

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How do I call a script from a template?
by John J. McDermott, CPLP 01 May '15

01 May '15

In a template I invoke (successfully) from a Dancer2 path I have some jquery that works outside Dancer2: $.post('/data1.pl',data,function(returnData){ $('#func').html(returnData) This code calls data1.pl and stuff its output into the div func. I know data1.pl works in a non-Dancer2 environment. But I cannot figure out where to put data1.pl so it can be run from the template. I tried just putting it in the dancer public (where the css folder, dispatch.cgi and such are), but that didn't work. I tried even to run it from the browser command line and the browser wants to download it. The directory has +ExecCGI and Dancer2 runs. Where should I put this file and what must I do so I can run it? Thanks! --john -- John J. McDermott, CPLP Learning and Performance Consultant jjm at jkintl.com 575/737-8556 Check out my security blog posts <http://cybersecurity.learningtree.com> Add an A for the Arts To STEM and get STEAM and a strong engine to move forward.

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the beauty of dancer
by Zahir Lalani 30 Apr '15

30 Apr '15

Hi All My apologies if this post is not fully appropriate, but I felt I needed to post - hope its ok. Although I have used over a dozen languages, over the last 6-8 years perl has been a favourite. But in my last job I was tasked with setting up a large team for a web based enterprise java app. It was big, SOA based took ages to get things done, even with a team of 30. I have recently moved jobs to a company that has no developers/architects and I was asked to get them into the same space as my previous company. I decided to look at all options again and choose objectively - a toolset to develop a large app with few deveopers. I seriously looked at some of the light weight java frameworks (Ninja), python, ruby and of course perl. I had used Dancer 1 for a small project only, but now Dancer2 seemed to really stand out. Perl was not 'cool' and I have had colleagues laugh at me for suggesting that as a serious option in previous jobs. But here it was down to me, and I eventually chose Dancer2, with Starman/Nginx and Postgresql as the DB. After a couple of weeks I have a the beginnings of a complex web app which is n+1 scaleable, which has a REST API module and will also have a messaging and workflow tool with a video render farm - all done in a single language and framework. Its damn quick to develop, its quick to run, even a colleague who is helping do the templating (and a php developer) is converted! Above all - it's actually fun to see the app come together so quick. Dancer2 is just amazing - the number of add-on modules is great and I can get on with the application without worrying about the nitty gritty. So - thank you to all who have been involved - you have done an amazing job. I just hope Dancer2 gets more exposure as a serious web framework that it deserves to be. Z

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random web page breakages
by Nikos Vaggalis 29 Apr '15

29 Apr '15

I'm building a site and it's all fine and well except when randomly getting part of the page (without any css,html) essentially like a semi-half blank page and ,sometimes again, getting a "Reload the page to get source for:" from the GET request using Firebug. Firebug's Net panels shows only the initial GET request but not the subsequent ones to the other resources, like the CSS file, images,Javascripts etc When that happens I get the following in the DBI trace log : " <-- dbd_st_finish 1 <- fetch= ( undef ) [1 items] row1 at /home/starman/perl5/perlbrew/perls/perl-5.18.1/lib/site_perl/5.18.1/x86_64-linux/DBD/ mysql.pm line 867 via at /home/starman/Foo/bin/../lib/MySite/Model.pm line 219 <- fetchrow_hashref= ( undef ) [1 items] row1 at /home/starman/Foo/bin/../lib/MySite/Model.pm line 219 via at /home/starman/Foo/bin/../lib/Foo.pm line 34 <> DESTROY(DBI::st=HASH(0x3fcfc60)) ignored for outer handle (inner DBI::st=HASH(0x3fcfac8) has ref cnt 1) -> DESTROY for DBD::mysql::st (DBI::st=HASH(0x3fcfac8)~INNER) <- DESTROY= ( undef ) [1 items] at /home/starman/Foo/bin/../lib/Foo.pm line 34 via at /home/starman/Foo/bin/../lib/Foo.pm line 34 DESTROY (dbih_clearcom) (sth 0x3fcfac8, com 0x41e4d70, imp DBD::mysql::st): FLAGS 0x180191: COMSET Warn RaiseError PrintError PrintWarn PARENT DBI::db=HASH(0x3d23dc0) KIDS 0 (0 Active) NUM_OF_FIELDS 38 NUM_OF_PARAMS 0 dbih_clearcom 0x3fcfac8 (com 0x41e4d70, type 3) done. <> DESTROY(DBI::db=HASH(0x3d18b00)) ignored for outer handle (inner DBI::db=HASH(0x3d23dc0) has ref cnt 1) -> DESTROY for DBD::mysql::db (DBI::db=HASH(0x3d23dc0)~INNER) imp_dbh->pmysql: 42d7440 <- DESTROY= ( undef ) [1 items] at /home/starman/Foo/bin/../lib/Foo.pm line 34 via at /home/starman/Foo/bin/../lib/Foo.pm line 34 DESTROY (dbih_clearcom) (dbh 0x3d23dc0, com 0x418e4e0, imp DBD::mysql::db): FLAGS 0x180391: COMSET Warn RaiseError PrintError PrintWarn AutoCommit PARENT DBI::dr=HASH(0x3c85940) KIDS 0 (0 Active) IMP_DATA HASH(0x3d23478) dbih_clearcom 0x3d23dc0 (com 0x418e4e0, type 2) done. " The setup is Dancer,Starman,Mysql on Digital Ocean Any help deeply appreciated, thanks!

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CORS and dancer (1)
by Tony Edwardson 27 Apr '15

27 Apr '15

Hi All I am working on implementing a REST api using dancer to be called from a website using ExtJs to get and send data as JSON. As the dancer app will be on a different port (and possibly on a different machine) I am trying to setup CORS. My initial attempt involved setting up shares in my Controller for each resource and method like this :- package Controller::API; use Dancer qw/ :syntax /; use Dancer::Plugin::CORS; ..... foreach my $resource (@resources) { get "/$resource" => sub { ........ }; get"/$resource/*" => sub { ........ }; # repeat for each method ........ share "/$resource" => origin => [ 'http://somewhere:port', ........ ], methods => [ qw/GET PUT POST DELETE OPTIONS/], credentials => 1; share "/$resource/*" => origin => [ 'http://somewhere:port', ........ ], methods => [ qw/GET PUT POST DELETE OPTIONS/], credentials => 1; } Which worked fine for get but when the extjs app tried a post or put to the api, it send OPTIONS first and I can't work out how to respond appropriately from the api to get it to send a post or put. Then I tried to setup CORS via Plack middleware but can't get that to work either. here is what I tried :- in environments/development.yml pack_middlewares: CrossOrigin: Doing this I see 'add middleware CrossOrigin' in the logs but CORS doesn't work (even on Get). Then I tried in my Controller:- set plack_middlewares => [ [ CrossOrigin => [ origins => '*', methods => ['GET', 'POST', 'PUT', 'OPTIONS','DELETE']]] ]; Still no joy. Anyone got any ideas ? Cheers Tony BTW: I would have prefered to use Dancer2 but it appears that there is no CORS plugin for Dancer2

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Installation failure
by Zahir Lalani 26 Apr '15

26 Apr '15

Hi All Got a really weird issue. I have been building up a rex script to setup a digitalocean VM from scratch. It has been working fine - till today. On installing Dancer2 I am getting failures regardless of the version I install (even without rex using cpanm Dancer2)?? The errors begin with: t/00-report-prereqs.t .................................. ok [main:9783] error @2015-04-24 14:06:00> Exception caught in 'core.app.before_request' filter: Hook error: Can't locate object method "failure" via package "Foo" (perhaps you forgot to load "Foo"?) at t/app.t line 150. at /root/.cpanm/work/1429898751.9695/Dancer2-0.159003/blib/lib/Dancer2/Core/App.pm line 852. in (eval 69) l. 1 ...... t/config_multiapp.t .................................... ok # Failed test 'Configuration file parsing failure' # at t/config_reader.t line 97. # 'Unable to parse the configuration file: /root/.cpanm/work/1429898751.9695/Dancer2-0.159003/t/config/environments/failure.yml: Can't use an undefined value as a HASH reference at /root/.cpanm/work/1429898751.9695/Dancer2-0.159003/blib/lib/Dancer2/Core/Role/ConfigReader.pm line 208. # at (eval 126) line 22. # ' # doesn't match '(?^:YAML)' # Looks like you failed 1 test of 19. ............... t/issues/gh-762.t ...................................... ok [App:9848] core @2015-04-24 14:06:24> Failed to deserialize the request: malformed JSON string, neither array, object, number, string or atom, at character offset 0 (before "invalid") at /root/.cpanm/work/1429898751.9695/Dancer2-0.159003/blib/lib/Dancer2/Serializer/JSON.pm line 41. in (eval 179) l. 2 t/issues/gh-794.t ...................................... ok [App:9849] core @2015-04-24 14:06:24> Failed to deserialize the request: 'false' expected, at character offset 0 (before "foo=bar") at /root/.cpanm/work/1429898751.9695/Dancer2-0.159003/blib/lib/Dancer2/Serializer/JSON.pm line 41. in (eval 179) l. 2 I can provide the whole log, but was hoping someone would know the issue from this? As I said, it has been working fine till now. Thx Z

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A way to separate code into smaller parts/files
by David H 25 Apr '15

25 Apr '15

Hi All, Looking for some general advice on separating code/code bases easily with Dancer. I'm using Dancer on a fairly large project (relatively speaking) and it is getting to >2000 lines of code so far. The end product could be in the order of 3000 lines. This is all one product. Another one I'm working on is going to be several different products in one is about 500 lines but is soon going to be at least twice that when I add some stuff in. What is the best way to separate these code bases into separate files? I want to keep the same 'instance' of Dancer, which is currently running under Ubuntu and Windows Plackup respectively and running well. I could just link another pm file into the main .pm file, would that be enough? so I have lib/DancerWebsite.pm and then I just add another .pm file in that directory and load classes from that? Thanks, David

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ip addess
by Hugues 24 Apr '15

24 Apr '15

Hello I move my Dancer app from wpsgi to " starman + apache proxy" in my code, I registered client ip address with my $ip = request->remote_address(); now, Ip address is always 127.0.0.1 see my apache config <VirtualHost *:80> ServerName admin.web.com DocumentRoot /home/web/ HostnameLookups Off UseCanonicalName Off ProxyPreserveHost On ProxyPass bootstrap ! ProxyPass fontawesome ! ProxyPass images ! ProxyPass javascripts ! ProxyPass css ! ProxyPass / http://localhost:5002/ retry=0 Keepalive=on ProxyPassReverse / http://localhost:5002/ TimeOut 300 <Proxy *> Order allow,deny Allow from all </Proxy> </VirtualHost> how I can get client Ip adress from my Dancer code ? thanks Hugues.

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