“...I've been working since 2008 with Ruby / Ruby on Rails, love a bit of Elixir / Phoenix and learning Rust.
I also poke through other people's code and make PRs for OpenSource Ruby projects that sometimes make it. Currently working for InPay...”
If you’re used to rendering your JSON response via call to_json on a collection on an object then it really is as simple as adding the callback option to render. You must ensure the callback parameter on the client end is the correct parameter than you feed to the callback option in your controller. This allows your JSON to be server without or without wrapping the response with a callback function depending on whether you include the callback parameter.
class Api
def index
respond_to do |format|
format.json do
render :json => Thing.all.to_json, :callback => params[:callback]
end
end
end
end
However, if you use JBuilder or any other JSON template engine then you’ll need to do things slightly differently. Here There is no need to change your controller method at but instead you can wrap the json repsonse in an after_filter which is a little cleaner.
class Api < ApplicationController
after_filter :wrap_response_with_callback
def index
respond_to do |format|
format.json
end
end
private
def wrap_response_with_callback
if request.get? && params[:callback] && params[:format].to_s == 'json'
response['Content-Type'] = 'application/javascript'
response.body = "%s(%s)" % [params[:callback], response.body]
end
end
end
module Something
def api
@api ||= Api.new
end
class Api
def do_something
:doing_something
end
end
end
class Thing
include Something
class Api
def do_thing
:doing_thing
end
end
end
Seems legitimate, just extend the class that I’ve included in my module.
2.1.2 :021 > Thing.new.api.do_thing
NoMethodError: undefined method `do_thing' for #<Something::Api:0x007f946546afe0>
from (irb):21
from /Users/rl/.rvm/rubies/ruby-2.1.2/bin/irb:11:in `<main>'
Wrong! Hmmzz…. I guess the class that the module is instantiating from is the one in the module not the one included in my Thing class I need to ensure that I instantiate from the right one.
module Something
def api
@api ||= self.class::Api.new
end
class Api
def do_something
:doing_something
end
end
end
class Thing
include Something
class Api
def do_thing
:doing_thing
end
end
end
</pre></code>
Works, but hang on.
<pre><code>
2.1.2 :019 > Thing.new.api.do_thing
=> :doing_thing
2.1.2 :020 > Thing.new.api.do_something
NoMethodError: undefined method `do_something' for #<Thing::Api:0x007fa60a4c1fc8>
from (irb):20
from /Users/rl/.rvm/rubies/ruby-2.1.2/bin/irb:11:in `<main>'
The class is not using the class I’ve defined in my module at all.
module Something
def api
@api ||= self.class::Api.new
end
class Api
def do_something
:doing_something
end
end
end
class Thing
include Something
class Api < Something::Api
def do_thing
:doing_thing
end
end
end
Waking up to an unexpected encoding error. Turns out the client has posted bullet points in their form data. It appears this isn’t working because the database is actually encoded in Latin1. Whereas it should be UTF-8.
An ActiveRecord::StatementInvalid occurred in jobs#create:
Mysql2::Error: Incorrect string value: '\xE2\x80\xA8\x0D\x0A\x0D...' for column 'description' at row 1: INSERT INTO `stuffs`
Converted the character set to UTF-8 easily. However, through checking is probably prudent given that mixed encodings and converting them can have unexpected results
mysql> ALTER TABLE stuffs CONVERT TO CHARACTER SET utf8;
Query OK, 2350 rows affected (1.25 sec)
Records: 2350 Duplicates: 0 Warnings: 0
First deploy of a new app shows an Apache Internal Server Error and the following errors appear in the VirtualHost’s log. Not particularly helpful.
/var/log/apache/app-error.log
[Wed Oct 29 07:02:17 2014] [error] [client 81.111.42.20] Premature end of script headers:
[Wed Oct 29 07:36:06 2014] [error] [client 81.111.42.20] Premature end of script headers:
[Wed Oct 29 07:37:56 2014] [error] [client 81.111.42.20] Premature end of script headers:
The default Apache error log shows more information. Seems I haven’t set up the Production secret key.
/var/log/apache/error.log
App 12630 stdout:
App 12424 stderr: [ 2014-10-29 07:37:56.3925 12630/0x0000000157c988(Worker 1) utils.rb:68 ]: *** Exception RuntimeError in Rack application object (Missing `secret_key_base` for 'production' environment, set this value in `config/secrets.yml`) (process 12630, thread 0x0000000157c988(Worker 1)):
App 12424 stderr: from /var/www/app/shared/bundle/ruby/2.1.0/gems/railties-4.2.0.beta1/lib/rails/application.rb:510:in `validate_secret_key_config!'
App 12424 stderr: from /var/www/app/shared/bundle/ruby/2.1.0/gems/railties-4.2.0.beta1/lib/rails/application.rb:243:in `env_config'
App 12424 stderr: from /var/www/app/shared/bundle/ruby/2.1.0/gems/railties-4.2.0.beta1/lib/rails/engine.rb:510:in `call'
App 12424 stderr: from /var/www/app/shared/bundle/ruby/2.1.0/gems/railties-4.2.0.beta1/lib/rails/application.rb:161:in `call'
App 12424 stderr: from /home/deployer/.rvm/gems/ruby-1.9.3-p448/gems/passenger-4.0.41/lib/phusion_passenger/rack/thread_handler_extension.rb:74:in `process_request'
App 12424 stderr: from /home/deployer/.rvm/gems/ruby-1.9.3-p448/gems/passenger-4.0.41/lib/phusion_passenger/request_handler/thread_handler.rb:141:in `accept_and_process_next_request'
App 12424 stderr: from /home/deployer/.rvm/gems/ruby-1.9.3-p448/gems/passenger-4.0.41/lib/phusion_passenger/request_handler/thread_handler.rb:109:in `main_loop'
App 12424 stderr: from /home/deployer/.rvm/gems/ruby-1.9.3-p448/gems/passenger-4.0.41/lib/phusion_passenger/request_handler.rb:448:in `block (3 levels) in start_threads'
Which is true.
Robs-iMac:matotu rl$ cat config/secrets.yml
# Be sure to restart your server when you modify this file.
# Your secret key is used for verifying the integrity of signed cookies.
# If you change this key, all old signed cookies will become invalid!
# Make sure the secret is at least 30 characters and all random,
# no regular words or you'll be exposed to dictionary attacks.
# You can use `rake secret` to generate a secure secret key.
# Make sure the secrets in this file are kept private
# if you're sharing your code publicly.
development:
secret_key_base: somekey
test:
secret_key_base: somekey
# Do not keep production secrets in the repository,
# instead read values from the environment.
production:
secret_key_base: <%= ENV["SECRET_KEY_BASE"] %>
I need to generate a new key, not the one I just posted though because that would be silly. I could place this in the repo replacing the ERB segment above but that’s not very secure.
Robs-iMac:app rl$ bundle exec rake secret
daf28cd197710437091a7bb8fef64b8fe0ccafc164f1c1a74f7b237e6a4b35cb9f6929259b41527035100c7a7a020b7bb1c2d6f6e4ce07df8a14a176ef50e40b
</pre></code>
Instead I shall place it in */etc/apache/envvars*
<pre><code>
bash-4.3# cat /etc/apache2/envvars
# envvars - default environment variables for apache2ctl
# Since there is no sane way to get the parsed apache2 config in scripts, some
# settings are defined via environment variables and then used in apache2ctl,
# /etc/init.d/apache2, /etc/logrotate.d/apache2, etc.
export APACHE_RUN_USER=www-data
export APACHE_RUN_GROUP=www-data
export APACHE_PID_FILE=/var/run/apache2.pid
## The locale used by some modules like mod_dav
export LANG=C
## Uncomment the following line to use the system default locale instead:
#. /etc/default/locale
export LANG
## The command to get the status for 'apache2ctl status'.
## Some packages providing 'www-browser' need '--dump' instead of '-dump'.
#export APACHE_LYNX='www-browser -dump'
export SECRET_KEY_BASE=somesecretkey
You’ll need to restart Apache, rather than just reload to get this to work. Obviously this is a environment variable for the entire Apache process, so if you wanted to host multiple applications on one server you could have to make the names of each secret unique.
What seemed like a simple task has amounted to plenty of messing about. But here we go, the following didn’t work at all, it filled /var/mail/rails with junk and failure messages about missing a missing bundle command.
rails@fashion1-002:/var/www/app/current$ crontab -l
# m h dom mon dow command
0 5 * * * cd /var/www/app/current && bundle exec rake app:activity:rebuild
# 0 9 * * 1 cd /var/www/app/current && bundle exec rake app:jobs:digest
# */5 * * * * cd /var/www/app/current && bundle exec rails runner "SiteMailer.simple_message('contact@mydomain.me', 'Test', 'Test Cron Message').deliver"
You have to use Environment Variables in this case to specify RAILS_ENV although it is already defined in my .bashrc, also if you’re using RVM in order to use the correct version of Ruby you must use RVM’s own wrapper scripts. Lastly to stop the output from cron ending up in a dead mailbox or spamming you direct the output of the command to /dev/null
I have been using JWPlayer for a while to dynamically load videos into Facebook. Later versions of JWPlayer completely disable this ability because it can leave the player open to abuse from sites using your hosted player. How rude of them. Consequently I’ve been stuck on a quite an old version of JWPlayer just to retain this ability. However, this appears to have stopped working in Facebook recently and I need to re-implement this in a more recent version of JWPlayer.
I don’t know any ActionScript at all, but hunting through it appears to me that the config for setting up the player is here. In this case loading the config via Flash Vars passed to the movie via Javascript. So in theory I should optionally allow the config to be loaded from params around here.
private function loadExternal():void {
if (ExternalInterface.available) {
try {
var flashvars:Object = ExternalInterface.call("jwplayer.embed.flash.getVars", ExternalInterface.objectID);
if (flashvars !== null) {
for (var param:String in flashvars) {
setConfigParam(param, flashvars[param]);
}
dispatchEvent(new Event(Event.COMPLETE));
return;
}
} catch (e:Error) {}
}
if (Security.sandboxType == Security.LOCAL_WITH_FILE) {
dispatchEvent(new ErrorEvent(ErrorEvent.ERROR, false, false, "Error loading player: Offline playback not supported"));
} else {
dispatchEvent(new ErrorEvent(ErrorEvent.ERROR, false, false, "Error loading player: Could not load player configuration"));
}
}
Ok, So it would appear there are copies of the JWPlayer Subversion repository floating around which show how configs are loaded in via RootReference. So in theory its just a question of putting this back in and rebuilding the player.swf. Might be nice to pull remote JSON instead of XML configs which would make things a bit more secure.
/**
* @return
* @throws Error if something bad happens.
*/
public function loadConfig():void {
loadCookies();
if (this.xmlConfig) {
loadXML(this.xmlConfig);
} else {
loadFlashvars(RootReference.root.loaderInfo.parameters);
}
}
/** Whether the "config" flashvar is set **/
public function get xmlConfig():String {
return RootReference.root.loaderInfo.parameters['config'];
}
/**
* Loads a config block from an XML file
* @param url The location of the config file. Can be absolute URL or path relative to the player SWF.
*/
public function loadXML(url:String):void {
var xmlLoader:URLLoader = new URLLoader();
xmlLoader.addEventListener(IOErrorEvent.IO_ERROR, xmlFail);
xmlLoader.addEventListener(SecurityErrorEvent.SECURITY_ERROR, xmlFail);
xmlLoader.addEventListener(Event.COMPLETE, loadComplete);
xmlLoader.load(new URLRequest(url));
}
/**
* Loads configuration flashvars
* @param params Hash map containing key/value pairs
*/
public function loadFlashvars(params:Object):void {
try {
for (var param:String in params) {
setConfigParam(param, params[param]);
}
dispatchEvent(new Event(Event.COMPLETE));
} catch (e:Error) {
dispatchEvent(new ErrorEvent(ErrorEvent.ERROR, false, false, e.message));
}
}
