[[!meta date="2016-08-10 16:35"]]
[[!tag nixos tuebix linux usability]]

[[!img media/tuex.png class="noFancy" style="float: right"]]
[[!summary cfp software written in golang for the tuebix linuxtag in tuebingen]]

# motivation

managing a 'call for papers' can be a lot of work. the tuebix [cfp](https://github.com/nixcloud/cfp)-software was created in the best practice of [KISS](https://en.wikipedia.org/wiki/KISS_principle).

# tuebix

we held a [linuxtag](https://de.wikipedia.org/wiki/Linuxtag) at the [university of tübingen](https://www.uni-tuebingen.de/) called [tuebix](http://www.tuebix.org/2016/programm_raumplan/) 
and we had a talk about `nixos` and a workshop about `nixops`.

[[!img media/cfp.jpg  ]]

[source](https://github.com/nixcloud/cfp)

# concept

the `cfp`-software backend is written in `golang`. the frontend was done in [materializecss](http://materializecss.com/). 

the workflow: 

* user fills the form-fields and gets instant feedback because of javascript checks
* after 'submit' it will generate a `json` document and send it via email to a mailinglist
* the mailinglist is monitored manually and people are contacted afterwards manually

after the `cfp` is over, one can use [jq](https://stedolan.github.io/jq/) to process the data for creating a schedule.

# hosting

security wise it would be good to create a custom user for hosting which was not done here.

## /home/joachim/cfp.sh
~~~~~~~~~~~~~~~~~~~~~~~~~~~~ { .bash }
#!/bin/sh
source /etc/profile
cd /home/joachim/cfp
nix-shell --command "while true; do go run server.go ; done"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

## systemd job
~~~~~~~~~~~~~~~~~~~~~~~~~~~~ { .bash }
systemd.services.cfp = {
  wantedBy = [ "multi-user.target" ];
    after = [ "network.target" ];
    serviceConfig = {
      #Type = "forking";
      User = "joachim";
      ExecStart = ''/home/joachim/cfp.sh'';
      ExecStop = ''
      '';
    };
};
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

## reverse proxy
~~~~~~~~~~~~~~~~~~~~~~~~~~~~ { .bash }
... 
# nixcloud.io (https)
{
  hostName = "nixcloud.io";
  serverAliases = [ "nixcloud.io" "www.nixcloud.io" ];

  documentRoot = "/www/nixcloud.io/";
  enableSSL = true;
  sslServerCert = "/ssl/nixcloud.io-2015.crt";
  sslServerKey = "/ssl/nixcloud.io-2015.key";
  sslServerChain = "/ssl/nixcloud.io-2015-intermediata.der";

  extraConfig = ''
    ...
    RewriteRule ^/cfp$ /cfp/ [R]
    ProxyPass /cfp/ http://127.0.0.1:3000/ retry=0
    ProxyPassReverse /cfp/ http://127.0.0.1:3000/
    ...
  '';
...
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

# summary

using `nix-shell` it was easy to develop the software and to deploy it to the server. all dependencies are contained. 

for further questions drop me an email: <a href="mailto:js@lastlog.de?subject=cfp@nixcloud">js@lastlog.de</a>