Use CDN with carrierwave + fog in s3 + cloudfront with rails 3.1

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hyperrjas

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Mar 31, 2012, 10:27:38 AM3/31/12

to carrierwave

I'm using **fog** with **carrierwave** in my website http://www.pintureka.com.
But the images load very very slowly.

Then I want to speed up loading of images with a CDN.

I have followed this tutorial for create the CDN for images:

http://maketecheasier.com/configure-amazon-s3-as-a-content-delivery-network/2011/06/25

I have now my distribution deployed for images but I don't know how
works fine the cdn. I have in initializers/fog.rb the next
configuration:

CarrierWave.configure do |config|
config.fog_credentials = {
:provider => 'AWS',
:aws_access_key_id => 'key',
:aws_secret_access_key => 'key',
:region => 'eu-west-1'
}
config.fog_host = "http://da33ii2cvf53u.cloudfront.net"
config.fog_directory = 'pin-pro'
config.fog_public = false
#config.fog_attributes = {'Cache-Control' => 'max-
age=315576000'}
end

I dont know if this is correct, but in my local machine it does not
works fine for me. I see the image location, is the same route as
before:

https://s3-eu-west-1.amazonaws.com/pin-pro/uploads/pins/medium_610cafbe-5d43-4223-ab0e-daa4990863c4.jpg?AWSAccessKeyId=AKIAIDX34WHYKB3ZKFVA&Signature=RwQriNpiRXaTxyfYVvYjsvclUa8%3D&Expires=1333203059

**How can I add a CDN to fog file in carrierwave with s3 and
cloudfront?**

Daniel Doubrovkine

unread,

Apr 28, 2012, 12:12:13 PM4/28/12

to carri...@googlegroups.com

If you have put all your assets on the CDN, you would change the asset_host.

From http://code.dblock.org/rails-s3-cloudfront-jammit-heroku-100 .

Tell our application to use an environment variable CLOUDFRONT_URL where available or S3_BUCKET otherwise. This can be done in config/environment.rb before Application.initialize!.

Example::Application.configure do

cloudfront_url = ENV["CLOUDFRONT_URL"]

s3_bucket = ENV["S3_BUCKET"]

if cloudfront_url
config.action_controller.asset_host = cloudfront_url

elsif s3_bucket
# Serve assets from Amazon S3

config.action_controller.asset_host = "http://" + s3_bucket + ".s3.amazonaws.com"

end

end

If your images are on the CDN, you need to use something similar to make URLs point to the CDN. We do this in our uploaders, deriving them from a generic ImageUploader.

class ImageUploader < CarrierWave::Uploader::Base

def default_url

"/assets/images/shared/missing_image.png"
end

def local_path
if (ENV['CLOUDFRONT_URL'] || ENV['S3_BUCKET'])

""
else

"local/"
end

end

# complete URL to an image version
def image_url_format_string

"#{self.class.image_url_prefix}/#{self.class.store_path_base(self.model)}:version.jpg"

end

# This is needed for Heroku as the default images/uploads/.. is not writable.

def cache_dir
"#{Rails.root.to_s}/tmp/uploads"

end

def store_path(for_file = filename)
"#{local_path}#{self.class.store_path_base(self.model)}#{(version_name || :original).to_s}.jpg"
end

def self.store_path_base(model)
class_name = model.class.name.underscore.pluralize

image_version = (model.image_version || 0) > 0 ? "#{model.image_version}/" : ""

"#{class_name}/#{model.id.to_s}/#{image_version}"
end

def self.image_url_prefix
if ENV['IMAGES_URL']

ENV['IMAGES_URL']
elsif ENV['CLOUDFRONT_URL']

ENV['CLOUDFRONT_URL']
elsif ENV['S3_BUCKET']

"http://#{ENV['S3_BUCKET']}.s3.amazonaws.com"

else
"/local"

end
end

end

Hope this helps.

cheers

dB.

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