February 2011 - dancer-users - lists.preshweb.co.uk

Handling file uploads
by Stefan Oberwahrenbrock 25 Mar '11

25 Mar '11

Hello! I have some trouble handling file uploads with my first dancer app. Maybe someone can point me in the right direction: To get hold of an uploaded file sent via PUT, I have set up this route handler: put '/upload/:file' => sub { my $upload = upload( params->{file} ); debug "My Log 1: " . params->{file}; debug "My Log 2: " . ref($upload); }; To test the handler, I feed it with some data sent by "curl": curl --upload-file /srv/mydata.tar.gz http://localhost:3000/upload/ As far as I understand the documentation, $upload should hold a reference to an object of typ Dancer::Request::Upload now. Thus, methods like "filename", "basename", "tempname" etc. should be accessible. The logfile looks quite good - at the beginning: [3432] debug @0.003234> [hit #1] trying to match `/upload/mydata.tar.gz' against /^\/upload\/([^\/]+)$/ in /usr/local/share/perl/5.10.0/Dancer/Route.pm l. 73 [3432] debug @0.003493> [hit #1] My Log 1: mydata.tar.gz in lib/mywebapp.pm l. 26 But the next line indicates, that $upload is not what I expect it to be: [3432] debug @0.003550> [hit #1] My Log 2: in lib/mywebapp.pm l. 27 In addition to that, calling one of methods mentioned above (e. g. "$upload->filename()" ), produces a runtime error: Can't call method filename on an undefined value at... Probably I have not understood the upload() subroutine correctly - any hint is welcome! Thanks, Stefan -- GMX DSL Doppel-Flat ab 19,99 €/mtl.! Jetzt auch mit gratis Notebook-Flat! http://portal.gmx.net/de/go/dsl

2 2

Minimum code required to get Dancer up and running?
by Brian E. Lozier 02 Mar '11

02 Mar '11

I'm going to do a test implementation of a dancer web app into an existing project. I would like to know the minimum files I need to create in order to get it running. My intention is not to use the scaffolding script to create files as 1) it creates a bunch of files I don't need [but I don't know which ones are strictly required], 2) it creates a directory structure designed to house all my code, but I already have a directory structure [that might not match Dancer's exactly], and 3) I find scaffolding scripts hide a bunch of information that it's really better for me to understand instead of gloss over. I would essentially like to start from scratch. If there is not already documentation on this and I get some feedback here, I'll be happy to write a document and submit it back to the list. I have a couple other questions as well. 1. Is it possible for me to specify the "templates" directory as something other than "views" (we use "template" function in the code, it makes more sense to load it from a "templates" directory instead of a "views" directory)? 2. Is there an in-code restriction that requires me to have the directory name of my project (like "myproject") match the name of the dancer app module (myproject.pm)? I ask because it's not perlish to have a lower-cased module (like myproject.pm) but I don't want to name my directory MyProject because it's annoying to type. Generally lower case module names are reserved for pragmas (like warnings, strict, feature, etc.). Thanks in advance for any help, Brian

4 9

Need Web Development?
by Al Newkirk & Associates 01 Mar '11

01 Mar '11

Get 50% Off This coupon entitles you to a 50% discount off web development services, redeemable by new clients only for a limited time. Al Newkirk & Associates has over twelve years professional experience in design, development and implementation in areas including but not limited to online marketing, user interface design, website usage tracking and return on investment analytics, strategic planning, web application development, prototyping, systems integration, content management, e-commerce, etc. We currently work with all major programming technologies, we understand the strengths and weaknesses of each programming language, their relevance and effectiveness to a particular project, and our recommendations are based accordingly. We provide a full range of development services, from website design and development to web application development and database administration. We are always current with web standards, trends and the general direction your competitors are taking through constant market research. We are also well informed as to what your internet customers expect from you and how to deliver it to them. We make your interest our own and consider those things that may not have occurred to you, but thats why you have or should hire us. We develop for mobile devices, handicaps, desktops, consoles and of-course the internet. This offer expires June 1, 2011. [1]view email in browser | [2]unsubscribe | [3]update your profile | [4]forward to a friend Links: 1. http://us2.campaign-archive2.com/?u=88dac43db8400b3c31482f730&id=87c73ef31b… 2. http://ana.us2.list-manage.com/unsubscribe?u=88dac43db8400b3c31482f730&id=d… 3. http://ana.us2.list-manage1.com/profile?u=88dac43db8400b3c31482f730&id=d758… 4. http://us2.forward-to-friend.com/forward?u=88dac43db8400b3c31482f730&id=87c… You are receiving this unsolicited mailing because you are currently or have previously collaborated or otherwise engaged in business with Al Newkirk and/or Associates. Please opt-out of this mailing if you do not wish to be contacted with this information in the future. Al Newkirk & Associates 32 S. Strawberry Street 3rd Floor Philadelphia, PA 19106 Email Marketing Powered by MailChimp http://www.mailchimp.com/monkey-rewards/?aid=88dac43db8400b3c31482f730&afl=1 Copyright (C) 2011 Al Newkirk & Associates All rights reserved.

6 7

alternate routes based on where the query is coming from
by Puneet Kishor 01 Mar '11

01 Mar '11

now that I have the following working (thanks Matt Vickers) % curl 'http://dm.local/dm.json?var=prcp&from=1980-1-1&to=1980-2-2' I get back {"prcp": [0, 1, 2, 1, 0 ... lots of elements .. ]} Except, these values need to be post-processed before display/use. Because I get back so many values, I do the transfer as above, and then post process them in the user's browser using JavaScript. $.ajax({ url : "/dm.json?var=" + v + "&from=" + from + "&to=" + to, type : "GET", data : "", dataType: "json", error : function() { alert("Error loading html document"); }, success : function(d) { var dt = d[v]; var data = []; for (var i = 0; i < dt.length; i++) { data.push( post_process(dt[i] ); } .. display( data ); } }); Of course, I don't have recourse to JavaScript with curl, so I need to "post process" the data *before* it gets to the user, that is, I need to do it on the server side. Of course, I could do this with two different routes, one for via the browser, and the other via curl. But, surely, Dancer has some way more elegant pas de deux that can do this, no? Come to think of it, pas de deux would be a nice name for a Dancer plugin. -- Puneet Kishor http://punkish.org Carbon Model http://carbonmodel.org Charter Member, Open Source Geospatial Foundation http://osgeo.org Science Fellow http://creativecommons.org Nelson Institute, UW-Madison http://nelson.wisc.edu ------------------------------------------------------------------ Assertions are politics; Backing up assertions with evidence is science ==================================================================

3 2

Cookies handling is broken
by Alexis Sukrieh 01 Mar '11

01 Mar '11

Hi again, A co-worker of mine started using Dancer to built an URL-shortener with unique-click stats. http://susbck.com/ To do so he uses multiple cookies to flag each visitors, and he came to realize that Dancer's cookie handling is ... well, completely broken :/ The most important thing we do wrong is to use one single Set-Cookie header (this is a recent change). Indeed, even if the HTTP specs tells us to do so, most browsers fail at parsing one Set-Cookie header with multiple values. Apparently it's way better to use multiple Set-Cookie headers (like Dancer used to do). Moreover, in the current version, Dancer splits the Set-Cookie header in a rather stupid way (split /[,;]/) which leads to have a mess of values when cookies are set with options (like "expires", or "path"). I'm saying that to the list just to warn you that we should change the way Dancer handles cookies. Actually, I think we should rewrite it completely, maybe by looking at how CGI::Cookie works. There already two issue reports written by my co-worker that explains what he came accross: https://github.com/sukria/Dancer/issues#issue/356 https://github.com/sukria/Dancer/issues#issue/357 Any help is welcome ;) I think this is our top-priority for the next release. Regards, -- Alexis Sukrieh

3 3

my dancer app
by Maurice Mengel 28 Feb '11

28 Feb '11

Hi, I thought I let you know that my dancer app finally is up and running: http://spk.mimo-project.eu:8080/oai?verb=Identify It is an OAI data provider that offers museum object data for digestion into another system. Currently, I use HTTP::Server::Simple behind a nginx cache and so far there was no reason to change that. More on OAI at http://www.openarchives.org/OAI/openarchivesprotocol.html. My code is at https://github.com/mokko/Salsa_OAI2 https://github.com/mokko/HTTP-OAI-DataProvider best maurice

2 2

Session cookie and send_file doubt
by Javier Sanchez 28 Feb '11

28 Feb '11

Hello !! im new to dancer adn im really enjoying hwo easy and simple it is, im actuaally testing some examples on the cookbook and soms simple functions and encountered a strange behaviour i cannot understand. Heres the code. #!/usr/bin/env perl use Dancer; use MyApp01; set port => 9001; before sub { if (! session('user') && request->path_info !~ m{^/login}) { redirect('/login'); } }; get '/login' => sub { # Display a login page; the original URL they requested is available as # vars->{requested_path}, so could be put in a hidden field in the form template 'login', { path => vars->{requested_path} }; }; post '/login' => sub { # Validate the username and password they supplied if (params->{username} eq 'bob' && params->{password} eq 'mierda') { session user => params->{user}; redirect params->{path} || '/'; } else { redirect '/login?failed=1'; } }; get '/logout' => sub { session->destroy; set_flash('You are logged out.'); redirect '/login'; }; get '/' => sub { if (session('user')) { redirect('/login'); } else { send_file '/o.html' ; } }; get '/hello/:name/peter' => sub { return "Hi there " . params->{name}; }; Allmos as posted on the dancer cookbook, login redirection works perfect, except when i request o.html, no matter if i explicit test if the user is logged, the file is shown on the browser. Its a simple html form, and when i click on submit im correctly redirected to /login but why is the first request not blocked ? Did i miss something on the manual about static files and session management ? Thank you Javi

3 2

Perl Bulgaria 2011
by Alexis Sukrieh 28 Feb '11

28 Feb '11

Hi list, I'd like to point you to my blog where I wrote down a report of my coming to Sofia's Bulgaria Perl Workshop that took place this weekend. I was invited there to give a talk about Dancer ;) http://www.sukria.net/fr/archives/2011/02/28/perl-bulgaria-2011-report/ Regards, -- Alexis Sukrieh

1 0

formatting curl output
by Puneet Kishor 27 Feb '11

27 Feb '11

punkish@Lucknow ~$curl 'http://dm.local/dm.json?var=prcp&from=1980-1-1&to=1980-2-2' { "prcp" : [ 0, 1, 1, 0, .. ] } Is there a way to get that curl output to be more compact, like so {"prcp": [0,1,1,0, .. ]} On the server side all I am doing is return {'prcp' => \@vals}; -- Puneet Kishor

3 2

cgi params via command line
by Puneet Kishor 27 Feb '11

27 Feb '11

use Dancer::Serializer::Mutable; use Dancer::Plugin::REST; prepare_serializer_for_format; [http://dm.local/dm.json?var=prcp&from=1980-1-1&to=1980-2-2] works just fine via an ajax query from the browser. However, the following via curl fails % curl http://dm.local/dm.json?var=prcp&from=1980-1-1&to=1980-2-2 [1] 18403 [2] 18404 punkish@Lucknow ~$<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <title>Error 404</title> <link rel="stylesheet" href="/css/error.css" /> <meta http-equiv="Content-type" content="text/html; charset=UTF-8" /> </head> <body> <h1>Error 404</h1> <div id="content"> <h2>Page Not Found</h2><p>Sorry, this is the void.</p> </div> <div id="footer"> Powered by <a href="http://perldancer.org/">Dancer</a> 1.3011 </div> </body> </html> What am I doing wrong? Puneet Kishor

2 2