Are my assets being served from AWS S3 - ruby

Question

Maybe a really daft question and please dont mark me down for this, but I finally got Heroku to compile its static assets in my S3 bucket with asset_sync.
Now how do i know that the assets are in fact being served from there, I take it theres no magic going on that pulls them in from s3? I have to set the path for each asset prefixed with
https://s3-eu-west-1.amazonaws.com/pathto/asset
Is there a way to set this in sinatra explicitly, I don't have to manually change every asset do I? that would be silly.
The asset_sync docs say to use this in rails
config.action_controller.asset_host = "//#{ENV['FOG_DIRECTORY']}.s3.amazonaws.com"
but im not sure how to set this in sinatra
EDIT
require 'bundler/setup'
Bundler.require(:default)
require 'active_support/core_ext'
require './config/env' if File.exists?('config/env.rb')
require './config/config'
require "rubygems"
require 'sinatra'
configure :development do
AssetSync.config.action_controller.asset_host = "//#{ENV['FOG_DIRECTORY']}.s3.amazonaws.com"
end
get '/' do
erb :index
end
get '/about' do
erb :about
end
This gives the following error in the console
undefined method `action_controller' for #<AssetSync::Config:0x24d1238> (NoMethodError)

Answer 1

Try putting it in Sinatra's configure block via the Async Built-in initializer, e.g:
configure :production do
AssetSync.config.action_controller.asset_host = "//#{ENV['FOG_DIRECTORY']}.s3.amazonaws.com"
end
It's possible you'll have to call AssetSync.sync as well at some point, I'm not sure.
Edit: using a configure block.
If you were using a modular app (if not, it's not any different, just remove the class bits)
class App < Sinatra::Base
configure :development do
set :this, "and that"
enable :something
set :this_only, "gets run in development mode"
end
configure :production do
set :this, "to something else"
disable :something
set :this_only, "gets run in production"
# put your AssetSync stuff in here
end
get "/" do
# …
end
get "/assets" do
# …
end
post "/more-routes" do
# …
end
# etc
end
See the link I added above for more.
action_controller is part of Rails. To prefix the path, the best thing you could do is use a helper:
helpers do
def aws_asset( path )
File.join settings.asset_host, path
end
end
configure :production do
set :asset_host, "//#{ENV['FOG_DIRECTORY']}.s3.amazonaws.com"
end
configure :development do
set :asset_host, "/" # this should serve it from the `public_folder`, add subdirs if you need to.
end
Then in a route or a view you can do something like this:
aws_asset "sprite_number_1.jpg"
To use with ERB and sinatra-static-assets's image_tag:
image_tag( aws_asset "sprite_number_1.jpg" )
or combine them (this may not work as the image_tag helper might not be seen in the scope of the helper, it's easier to try it than to think about it):
helpers do
def aws_image( path )
image_tag( File.join settings.asset_host, path )
end
end
# in your view
aws_image( "sprite_number_1.jpg" )
I'm sure there'll be an easier way to do this but this will do for a quick and dirty solution.