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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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Dancer2 Plugins
by Tony Edwardson 21 Apr '15

21 Apr '15

Hi All Anyone know if there are Dancer2 equivalents to Dancer::Plugin::CORS and Dancer::Plugin::I18N ? Cheers Tony

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[Dancer2] broken plugins
by Henk van Oers 21 Apr '15

21 Apr '15

Does anyone on this list know? ---------- Forwarded message ---------- On Sat, 18 Apr 2015, Russell Jenkins wrote: > Have you have a chance to look at either proposal? I searched for this but did not find the proposals. Do you have any links?

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Proposed plugin Dancer2::Plugin::RootURIFor
by John Barrett 19 Apr '15

19 Apr '15

Hey all, Following some discussion on #dancer today, I have a couple of questions. Firstly, before I go ahead and wrap this in tests and CPAN-ify it, does it seem useful? Dancer2::Plugin::RootURIFor provides root_uri_for, which is the same as uri_for except it ignores your application's mount point / base path. The use-case for this is if you have multiple applications and would like to construct links between them (or to other resources) which retain URI scheme, host, port etc. e.g. You have two apps, mounted on /app1 and /app2. Calling: uri_for '/app2' ...from app1 will give you 'http://.../app1/app2'. Calling: root_uri_for '/app2' ...from app1 will give you 'http://.../app2'. First pass: <https://gist.github.com/jbarrett/e568195bbb6fe5aec9ae> Secondly, is there a better or more idiomatic way to achieve this? Does this function already exist? Thanks.

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Migrating from dancer to dancer2
by Alfonso Pinto 19 Apr '15

19 Apr '15

Dear all, I'm in the process of migrating and cleaning an app using dancer to dancer2 I've almost everything working and covered, including splitting the big monolithic app into several dancer2 apps using Plack::Builder like this: return builder { mount '/app1' => My::App1->to_app; mount '/app2' => My::App2->to_app; } The only problem I'm not able to solve is this one: # HOOKS (executed BEFORE and AFTER each route) hook before => sub { $memd->incr( "stats.api." . request->{_route_pattern} . "." . request->{method} ); }; hook after => sub { my $response = shift; $memd->incr( "stats.api." . request->{_route_pattern} . "." . request->{method} . "." . $response->status ); }; We use hooks to store some statistics in memcached. The problem is that I can't find a way to substitute request->{_route_pattern} to get the route handler used For the method I found I can use request->method and, as I'm mounting the app using Plack::Builder, I can get the base of the url with request->base. The idea is, having a request like this: GET http://localhost:3000/app1/123456 and a route handler like: get ':userid' => sub {...} we should increment the value of this key in memcached: stats.api./app1/:userid.GET so, my question is how to get the '/:userid' part in the hook to compose the key I need to increment in memcached. Thanks in advance and regards. Alfonso

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