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Custom FILTERS for TemplateToolkit in dancer?
by Assaf Gordon 13 Oct '11

13 Oct '11

Hello, Has anyone managed to add a custom Template-Toolkit Filter when using Dancer ? Using TT directly, the code would looks like this: ====== sub my_custom_filter { my $text = shift ; ## Do something to $text; return $text; } my $tt = Template->new( { FILTERES => { 'my_custom_filter' => \&my_custom_filter } }); ====== Using Dancer, I see the TT->New() call is in "Dancer/Template/TemplateToolkit.pm", and I could even possibly add configuration options using "config.yml", but how do I specify a reference to a sub in my code ? Any suggestions will be appropriated, Thanks, -assaf.

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Re: [Dancer-users] Custom FILTERS for TemplateToolkit in dancer?
by Matthew Vickers 13 Oct '11

13 Oct '11

Hi Assaf, I could be completely off base, and please tell me if I am, when I need to use custom code in the template I use before_template sub { my $tokens = shift; $tokens->{'my_custom_filter'} = &custom_filter; }; Then I call the custom helper in the template like so <h1><% custom_filter("Hello World") %></h1> I have written a basic post here: http://www.quispiam.com/blog/post.php?s=2011-09-21-adding-custom-helper-met… Cheers Matt ----- "Assaf Gordon" <gordon(a)cshl.edu> wrote: > Hello, > > Has anyone managed to add a custom Template-Toolkit Filter when using > Dancer ? > > Using TT directly, the code would looks like this: > ====== > sub my_custom_filter { > my $text = shift ; > ## Do something to $text; > return $text; > } > > my $tt = Template->new( { > FILTERES => { 'my_custom_filter' => \&my_custom_filter } > }); > ====== > > > Using Dancer, I see the TT->New() call is in > "Dancer/Template/TemplateToolkit.pm", > and I could even possibly add configuration options using > "config.yml", but how do I specify a reference to a sub in my code ? > > Any suggestions will be appropriated, > > Thanks, > -assaf. > > _______________________________________________ > 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] more random bugs
by Puneet Kishor 12 Oct '11

12 Oct '11

On Oct 12, 2011, at 3:42 PM, Joel Roth wrote: >>> Hi Joel, Many thanks for checking it out and confirming my fears. > >>> I haven't fixed anything. It is just random. The white >>> characters on black background is "wrong" as it should >>> appear only when /present/ is present in the route. That >>> URI I gave above should always, 100% of the time, show >>> black characters on white background. Yes, the photo >>> should change as that is randomly selected. > > While I was writing, the site was briefly unavailable, Yeah... I rebooted to enable iCloud on my iMac. :-) > then the problem (seemed to have) disappeared. Did you diddle the site > at all? No, other than rebooting the computer, I have not done anything at all. > >>> This is very disconcerting. > >> as I mentioned above, which template is used is (or should >> be) determined solely by the route used. And, needless to >> say, the "presentation" template is exclusively within the >> `get '/present/:page_name'` route. The app doesn't even >> have any logins or any session implementation from me. >> Other than the fact that it is running on Starman, which, >> I guess, makes it a persistent application. > > Can you make it non-persistent just for testing purposes? > That might help narrow down the issue. > Rats... that is the more difficult part. I have no end of problem running Dancer apps with Apache, so I keep on gravitating toward Starman. That said, when, for a while, I was running apps with apache and plain CGI, I would never have any issues other than an ever so slightly slow-poke performance. Now I have close to 10 apps on this machine, so Apache is more problematic as either I run all the apps as plain CGI, or, any change in any one app would cause me to reboot apache, and thus restart all the apps. >> I can understand that if I had a web page accessible at >> punkish.org/present (being a stand alone, regular, black >> characters on white bg page) then that would conflict with >> punkish.org/present/a_page (being a route delivering a >> white chars on black bg presentation of a page called >> "a_page"). But, that is not the case. > > I would hope that there could be some kind of > debugging support to understand how Dancer > works through selecting the route and template. Well, there is the log that does show all the regexp shenanigans that happen in selecting a route. Maybe I should enable that in a development version, and then keep watching the logs. And then when I get a wrong template, try to see what the messages were at that point. Hmmm... will try that. > > Best, > > Joel > >> Très bizarre. >> >> Puneet. > > -- > Joel Roth

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more random bugs
by Puneet Kishor 12 Oct '11

12 Oct '11

random, in other words, not easy to reproduce. I have get '/present/:page_name' => sub { .. }; followed by get '/*?' => sub { .. }; Yet, from time to time, a regular web page, meant to be picked up the second route above, gets picked up by the first route, thereby sending the wrong html template. As I said, I can't reliably reproduce it, but from time to time, when I load my web site at http://punkish.org/The-Paradigm,-The-Framework,-and-The-Instantiation (notice, no "present" in the path_info), I get the wrong template. Please, please... my favorite Perl-thing, please don't turn buggy on me. I have close to a dozen apps riding on this, and I want it to be rock-solid-reliable. Puneet.

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session question
by Niels Larsen 03 Oct '11

03 Oct '11

If memcached is used as session engine, then session get and set will make a network request to whatever server is configured, I assume. Which is slower than first getting the entire session, then modifying it throughout the application, then saving it, as an after-template hook for example. But I do not see an operator to set an entire session? or is that a wrong-headed idea anyway? Niels Larsen http://genomics.dk (The memcached storage engine interface crashes, but is being fixed, Sawyer X wrote earlier. And this is, for me, not an urgent question, just curious).

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questions about speed
by Nick Knutov 02 Oct '11

02 Oct '11

Hello all, today I found, that previous version of our project (hosting billing system), written on perl, fastcgi and using CTPP as template engine generates pages faster, then new version of this project, written with dancer and ctpp and running with plackup/starman. The most part of the code remains the same, but we add cache(*) and reduce the number of SQL queries (this led to an increase of speed - we checked it). So the question - where should I look for the problem? The first idea - I know that HTML::CTPP2->new() takes a lot of time. It is called in Dancer::Template::Ctpp2, which is `use base 'Dancer::Template::Abstract';` so the question - is sub init() in this module runs only once when starting the app, or on every query? The second question - can this be because of plackup or starman? Where should I look in this case? ps: plackup -E production -s Starman --workers=4 -l bill.sock -a bin/app.pl One parallel query in all cases. pps: (*) about our cache - just in-memory hash with already loaded data from db, which returns already loaded data instead of making new query - this can not lead to taking more time on requests. And, without this cache, with the old code, it's just slower. -- Best Regards, Nick Knutov http://knutov.com ICQ: 272873706 Voice: +7-904-84-23-130

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a REST question immediately followed by a Dancer-implementation question
by Mr. Puneet Kishor 30 Sep '11

30 Sep '11

So, I have a lot of methods such as get '/foo' => { .. }; get '/bar' => { .. }; get '/baz' => { .. }; get '/qux' => { .. }; All the above methods are reachable via a browser in which they depict some visual representation of the data. Most of the above methods have their '.:format' counterparts, mostly returning JSON packets when reached either via the browser or via the command line. All the methods above return something by default or modified by parameters. So, "http://server/app/foo" may work, or may require some parameters as in "http://server/app/foo?age=27&before=yesterday&for=rascals" I would like to implement a "meta" method, say get '/rest' => { .. }; which should return a listing of all the methods above, along with their parameters, if any, and whether those parameters are optional or required. http://server/app/rest {"resources": [ {"name": "foo, "params": [ {"required": [ {"name": "age", "type": "int"} ]}, {"optional": [ {"name": "before", "type": "string"} {"name": "for", "type": "string"} ]}, ]} ]} In other words, this meta method returns all the resources available at the http://server/app. Of course, I could code this for each app, but it would be nice to automate it. Suggestions? Ideas? -- Puneet Kishor

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Global app-wide "prefix" settings
by Assaf Gordon 28 Sep '11

28 Sep '11

Hello, (Somewhat related to the previous thread of "Deploying many many apps") Is there a way to specify a application-wide "prefix" settings ? The "prefix" keyword affects only the routes subroutines, but not the static/public files. For example, With WSGI/Pylon, they have a "prefix" settings that can be specified in the INI file, and that affects all the components of the application (including static files). This allows the following: 1. Write your application as usual (so route '/' is really '/', and images are /images/XXXX.jpg and javascripts are in /javascript/XXXX.js, etc.) 2. Add a "prefix" setting to the INI file (e.g. "prefix=dancer"), now: the root route because "/dancer/", images come from /dancer/images/XXXX.jpg javascripts come from /dancer/javascripts/XXXXX.js css files come from /dancer/css/XXXXXX.css etc. 3. In Apache (or NGinx), do something like: RewriteRule ^/dancer/images/(.*) /home/gordon/projects/my_dancer_app/public/images/$1 [L] RewriteRule ^/dancer/javascripts/(.*) /home/gordon/projects/my_dancer_app/public/javascripts/$1 [L] RewriteRule ^/dancer/css/(.*) /home/gordon/projects/my_dancer_app/public/css/$1 [L] RewriteRule ^/dancer(.*) http://localhost:3000$1 [P] The outcome: 1. Static content is served by Apache directly, doesn't even go to the application (based on a "rewrite_rule"). 2. Multiple applications can be deployed with different URL-prefix, without changing a single line of code in the application (just in the INI file). Does Dancer support something similar ? I haven't deployed a production server yet, but I'm planning do do so with several applications running on the same server (with different prefixes), and after reading Dancer::Deployment I'm still not sure what's the recommended way to do so. suggestions are very welcomed, -gordon

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How to set config-environments when using Dancer as script
by Assaf Gordon 28 Sep '11

28 Sep '11

Hello, I want to use "Dancer" (with some plugins, especially Database) from a command-line script, to accompany my website (some sort of behind-the-scenes access to the website infra-structure). But I've noticed that Dancer (when used with ":script" option) ignores any command line arguments, and so the "environment" can't be set, and so the configuration settings are always loaded from "development.yml". Example: === use Data::Dumper; use Dancer ':script'; use Dancer::Plugin::Database; ## too late - dancer already initialized with "development" environment setting ( "environment" => "production" ) ; my @result = database->quick_select( ### Whatever ### ) ; print Dumper(\@result),"\n"; === A work-around is to load Dancer with ":syntax" and initialize manually, but is this the best way? === use Data::Dumper; use Dancer ':syntax'; use Dancer::Plugin::Database; setting( "environment" => "production" ) ; Dancer::_init_script_dir($0); Dancer::Config->load; my @result = database->quick_select( ### Whatever ### ) ; print Dumper(\@result),"\n"; === Perhaps I'm doing something wrong, so any help is appreciated. Thanks, -gordon

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Memcached beginners problem
by Niels Larsen 27 Sep '11

27 Sep '11

Greetings, I, a Dancer newcomer, have trouble getting Dancer::Session::Memcached to work. All works with session Simple, but with memcached I get the error below. The memcached server was started with ./memcached (responds on port 11211) and the Cache::Memcached module is installed. The application was started with just ./application.pl --environment development, and the development.yml file has in it session: "memcached" memcached_servers: "127.0.0.1:11211" I did not 'use Dancer::Session::Memcached' because documentation does not say so, and I'm sure its a dumb mistake by me. But the crash is not so informative, and the format of the listing could be also be improved: module names (not file names) and line numbers should be at the left so they line up, and the traceback should include application code. It only shows Dancer code. And a wish: the Messagepack library is the fastest serialization method, I think, and I hope Dancer will support it some day. I use it already, and Kyoto Tycoon for permanent storage, works well. Unlike Membase/cache one can save pretty big strings, which reduces the number of times one must touch the storage, which again speeds the whole thing. Niels Larsen http://genomics.dk ------------------------------------------------------------------------ Error 500 runtime error Warning caught during route execution: Use of uninitialized value $key in concatenation (.) or string at /home/donate/DONATE/Software/Package_installs/Perl_modules/lib/perl5/Cache/Memcached.pm line 521. 518 $exptime = int($exptime || 0); 519 520 local $SIG{'PIPE'} = "IGNORE" unless $FLAG_NOSIGNAL; 521 my $line = "$cmdname $self->{namespace}$key $flags $exptime $len \r\n$val\r\n"; 522 523 my $res = _write_and_read($self, $sock, $line); 524 ------------------------------------------------------------------------

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