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

no styles
by Krystian Samp 28 Aug '10

28 Aug '10

Hi, I'm using lighttpd with the following settings: $HTTP["host"] =~ "hci.deri.ie" { fastcgi.server += ( "/" => ( "" => ( "socket" => "/tmp/fcgi.sock", "check-local" => "disable", ) ) ) } In a newly generated dancer app (dancer -a test) I run: plackup -s FCGI --listen /tmp/fcgi.sock /home/testuser/test/test.pl when I go to hci.deri.ie in the browser I get the dancer start page but without any styles. It seems that the requests look good (from access.log): 10.2.19.5 hci.deri.ie - [28/Aug/2010:02:06:50 +0000] "GET / HTTP/1.1" 200 403 "-" "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.3 (KHTML, like Gecko) Chrome/6.0.472.41 Safari/534.3" 10.2.19.5 hci.deri.ie - [28/Aug/2010:02:06:51 +0000] "GET /css/style.css HTTP/1.1" 404 363 "http://hci.deri.ie/" "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.3 (KHTML, like Gecko) Chrome/6.0.472.41 Safari/534.3" So it appeared to me that dancer does not serve /css/style.css appropriately - i.e. from /public/css/style.css This is what I can see in error.log: 2010-08-28 02:06:50: (mod_fastcgi.c.2701) FastCGI-stderr: 10.2.19.5 - - [28/Aug/2010 02:06:50] "GET / HTTP/1.1" 200 391 "-" "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.3 (KHTML, like Gecko) Chrome/6.0.472.41 Safari/534.3" 2010-08-28 02:06:51: (mod_fastcgi.c.2701) FastCGI-stderr: 10.2.19.5 - - [28/Aug/2010 02:06:51] "GET /css/style.css HTTP/1.1" 404 351 " http://hci.deri.ie/" "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.3 (KHTML, like Gecko) Chrome/6.0.472.41 Safari/534.3" I'm using Dancer 1.1809, FreeBSD and the newest lighttpd with fastcgi module. Do you know why /css/style.css (and other files) are not served properly? What should I do? Thanks in advance, Krystian

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2nd Dancer's meeting in Paris
by franck 27 Aug '10

27 Aug '10

Hi I want to announce our second Dancers meeting: September the 30, a thursday. "Le Blue Buoï, 50 boulevard Pasteur, 75015 Paris" Google Maps: http://yoolink.to/9OY We can meet there at 7PM.

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ajax method, what? why? how?
by P Kishor 26 Aug '10

26 Aug '10

I can't figure out how the ajax method works. In my JavaScript (with jQuery), I have $.ajax({ beforeSend: function(xhr){ xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest"); }, url: '/model/' + model_id, dataType: "json", success: function(data) { // do something with } }); and, in my App.pm, I have ajax '/model/:model_id' => sub { my $result = do something with model_id return to_json($result); } however, the above doesn't work at all. I get a 404. If I change the ajax method to get '/model/:model_id' => sub {} then it works fine. Which brings me to the question -- what is this ajax method supposed to do better than get or post? And, why doesn't it work for me? -- Puneet Kishor http://www.punkish.org Carbon Model http://carbonmodel.org Charter Member, Open Source Geospatial Foundation http://www.osgeo.org Science Commons Fellow, http://sciencecommons.org/about/whoweare/kishor Nelson Institute, UW-Madison http://www.nelson.wisc.edu ----------------------------------------------------------------------- Assertions are politics; backing up assertions with evidence is science =======================================================================

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Ajax and Dancer
by Peter Gordon 26 Aug '10

26 Aug '10

I am trying to use Ajax, and javascript is expecting a content-type of text/xml. I have come up with the following pattern, which is not very pretty. ajax '/hello' => sub { my $data=<<'EOD'; <taconite> <replaceContent select=".target"> NEW DATA </replaceContent> </taconite> EOD return Dancer::Response->new( content => $data, headers => [ 'Cache-Control' => 'no-store, no-cache, must-revalidate', 'Keep-Alive' => 'timeout=5, max=99', 'Connection' => 'Keep-Alive', 'Transfer-Encoding' => 'chunked', 'Content-Type' => 'text/xml; charset=UTF-8', ] ); I would pefer something like this: ajax '/hello' => sub { my $data=<<'EOD'; <taconite> <replaceContent select=".target"> NEW DATA </replaceContent> </taconite> EOD return $data ; } What would be the best/nicest way of doing this? Dancer::Route uses the global content_type, but that would seem to affect all content_types. A related question is: How can I set context related information. Peter

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self_url()
by Maurice Mengel 25 Aug '10

25 Aug '10

Hi, what's Dancer's equivalient to CGI's self_url() please? It seems that request returns only bits and pieces. Probably I am just blind. Thanks Maurice

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creating an abstract class and then basing other classes on that
by P Kishor 25 Aug '10

25 Aug '10

I upgraded to 1.1808, to benefit from the new work done by the developers, and also to try out the new, multi-folder pattern suggested by Sukria. So, now I have appdir/ yourapp.pl lib/ yourapp.pm yourapp/ function1.pm function2.pm views/ function1/ function2/ in yourapp.pm, you mount your subapps like that package yourapp; use Dancer ':syntax'; load_app 'yourapp::function1', prefix => '/function1'; load_app 'yourapp::function2', prefix => '/function2'; ... and in your subapps: package yourapp::function1; use Dancer ':syntax'; get '/' => sub { " template '/function1/index'; }; So, first, in my subapps, I have to specify the full relative path to the views as shown above. That works. But, now I want to create modules for the subapps as well. This would be in the spirit of how there is Dancer::Session::Abstract, and then, there are the real Dancer::Session::YAML and Dancer::Session::Simple, etc. My reason is thus -- take either function1 or function2, and provide the ability to query data with the same call, but from different data stores based on a config setting. So, the user calls `data()` but if the config setting is 'db' then get the data from a database, or if the config setting is 'file' then get the data from a file. So, now I have appdir/ yourapp.pl lib/ yourapp.pm yourapp/ function1.pm function1/ data.pm file.pm function2.pm function2/ data.pm file.pm But, I can't figure out what is the path to my modules? For example, in function1.pm, should I say `use function1::data` or `use yourapp::function1::data`? -- Puneet Kishor http://www.punkish.org Carbon Model http://carbonmodel.org Charter Member, Open Source Geospatial Foundation http://www.osgeo.org Science Commons Fellow, http://sciencecommons.org/about/whoweare/kishor Nelson Institute, UW-Madison http://www.nelson.wisc.edu ----------------------------------------------------------------------- Assertions are politics; backing up assertions with evidence is science =======================================================================

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dance being called twice
by P Kishor 25 Aug '10

25 Aug '10

I am still on Dancer 1.1805. I have a weird problem. For some reason, my application seems to be running twice for every request. I put a few debug messages, and you can see below what is happening. Here is the skeleton of my app, with line numbers. 1> get '/foo/:bar' => sub { 1> debug 'in foo with param = ' . params->{offset}; 1> qux( params->{bar}, 'foo' ); 1> }; 26> get '/*?' => sub { 27> my ($p) = splat; 28> $p = 'lat' unless $p; 29> debug 'in bar with param = ' . $p; 30> qux( params->{bar}, 'bar' ); 31> }; 293> sub qux { 294> my ($from) = @_; 295> debug "in qux with param = " . $from; 296> } Here is the debug log. Each time I refresh the browser, I get two hit #1 and two hit #5. What is going on? [68325] debug @0.000540> [hit #1] in bar with param = lat in ../dance.pm l. 29 [68325] debug @0.040846> [hit #1] in qux with param = bar in ../dance.pm l. 295 [68325] debug @0.000396> [hit #5] in bar with param = lat in ../dance.pm l. 29 [68325] debug @0.000868> [hit #5] in qux with param = bar in ../dance.pm l. 295 [68328] debug @0.000409> [hit #1] in bar with param = lat in ../dance.pm l. 29 [68328] debug @0.001359> [hit #1] in qux with param = bar in ../dance.pm l. 295 [68328] debug @0.000396> [hit #5] in bar with param = lat in ../dance.pm l. 29 [68328] debug @0.000864> [hit #5] in qux with param = bar in ../dance.pm l. 295 -- Puneet Kishor

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flow control
by Maurice Mengel 25 Aug '10

25 Aug '10

Hi all, am I the only one who struggles with this? Maurice package dancer_test; use Dancer ':syntax'; our $VERSION = '0.1'; get '/1' => sub { #You put all the code here, #collect all the output and then just return it #via template or as html etc. return "I wanna hold your hand"; #works }; get '/2' => sub { #you don't even have to write a return "I wanna hold your hand"; #works too #let's call it a "magic return" since there is no return #seems to be a feature of perl not of dancer }; get '/3' => sub { #works only as long as you don't have anything after the return value "I wanna hold your hand"; #does NOT work my $i; }; get '/4' => sub { #sometimes Dancer displays the last variable (magic return) my $out="I wanna hold your hand"; }; get '/5' => sub { #return values from a sub five(); #I find this one a bit spooky }; sub five{ #this outputs the content of $out although no return anywhere #so we might call it "magic return in a sub" my $out="I wanna hold your hand"; } get '/6' => sub { six(); #returns 1 for success, not the content of $out }; sub six{ #this outputs the content of $out although no return anywhere my $out="I wanna hold your hand"; debug "I get here of course"; } get '/7' => sub { seven(); }; sub seven { #this seems more proper than six my $out="I wanna hold your hand"; return $out; debug "I never get here of course"; } get '/8' => sub { eight(); # does not output anything eight(); # does output once #I find this one a bit unintuitive }; sub eight{ #same as no. 5 my $out="I wanna hold your hand"; } get '/81' => sub { eight(); # does not output anything eight(); # does not output anything debug "Does output a one for success"; #I find this one a bit unintuitive }; get '/9' => sub { #if you actually want the return value twice in your output my $r=nine(); $r.=nine(); }; sub nine { #I consider this good style return "testing seven"; } get '/10' => sub { #works just as 9 my $r=ten(); $r.=ten(); }; sub ten { #as 9 but with magic return value "testing seven"; } get '/11' => sub { #i want to stop if any errors are returned eleven_one(); #does not display anything eleven_two(); #displays "I don't ever want to get here"; }; sub eleven_zero{} sub eleven_one{ #do this and that #if I encounter an error #if I don't encounter an error I return #nothing like in eleven_zero my $error="code 101"; return $error; } sub eleven_two{ return "I don't ever want to get here"; } get '/11b' => sub { #result is as in 11 eleven_three(); #does not display anything eleven_two(); #displays "I don't ever want to get here"; }; sub eleven_three{ #Dancer keyword halt does not work in this sub return halt "I don't ever want to get here"; #halt works only in a filter like before } get '/11c' => sub { #result is different from 11, but never returns eleven_two even if first #one returns nothing (see 11d) return eleven_one(); #displays "code 101" eleven_two(); #never gets there }; get '/11d' => sub { #result is different from 11 return eleven_zero(); #returns nothing eleven_two(); #never gets there }; get '/11e' => sub { #gets to eleven_two only if no error returned from eleven_one #see 11f my $ret=eleven_one(); return $ret if $ret; $ret=eleven_two(); return $ret if $ret; }; get '/11f' => sub { #gets to eleven_two only if no error returned from eleven_zero my $ret=eleven_zero(); return $ret if $ret; $ret=eleven_two(); return "I do want to get here now" if $ret; }; get '/11g' => sub { #returns emptys string my $ret=eleven_zero(); return $ret; $ret=eleven_two(); return "I do want to get here now"; }; #how does it look if we use OO? true;

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deployment and performance
by Maurice Mengel 25 Aug '10

25 Aug '10

Hi again, if i cut my big xml to a16th of the original size, I have an acceptable speed using DancingAppl.pl for development. Is there any chance by improving speed enough by proper deployment to get it working with full xml? In Dancer::Deployment various deployment strategies are described, but the text doesn't say very much about performance. Thanks! Maurice

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setting up an alias in Apache2 fails when using Plack::Handler::Apache2
by P Kishor 25 Aug '10

25 Aug '10

This is driving me nuts... not really a Dancer question, but since my only experience with PSGI is via Dancer, here goes. I have the following set-up with Apache2 vhost <VirtualHost *:80> ServerName foo.org ServerAlias www.foo.org DocumentRoot "/Users/punkish/Sites/foo" Alias /lib "/Users/punkish/Sites/lib" <Directory "/Users/punkish/Sites/foo"> AllowOverride None Order allow,deny Allow from all </Directory> <Directory "/Users/punkish/Sites/lib"> AllowOverride None Order allow,deny Allow from all </Directory> <Location /> SetHandler perl-script PerlHandler Plack::Handler::Apache2 PerlSetVar psgi_app /Users/punkish/Sites/foo/app.psgi </Location> ErrorLog "/Users/punkish/Logs/foo.org-error_log" CustomLog "/Users/punkish/Logs/foo.org-access_log" common </VirtualHost> Everything works well, except for the /lib alias. If I have the Location handler calling the app via Plack::Handler::Apache2, http://foo.org/lib or http://foo.org/lib/ both throw a 404. -- Puneet Kishor http://www.punkish.org Carbon Model http://carbonmodel.org Charter Member, Open Source Geospatial Foundation http://www.osgeo.org Science Commons Fellow, http://sciencecommons.org/about/whoweare/kishor Nelson Institute, UW-Madison http://www.nelson.wisc.edu ----------------------------------------------------------------------- Assertions are politics; backing up assertions with evidence is science =======================================================================

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