Previously while we need to pass user authtoken with ActiveResource API calls, we were using class variables. But that doesn’t look good as we were running multiple instances of our app. Our previous code look something like
# app/controllers/application_controller.rb
class ApplicationController < ActionController::Base
before_filter :set_active_resource_header
private
def set_active_resource_header
if current_user
ActiveResource::Base.auth_token = session[:user].auth_token
end
end
end
and we patched ActiveResource::Connection#authorization_header to use our token
# In ActiveResource::Connection#authorization_header patch
module ActiveResource
class Base
cattr_accessor :token
end
class Connection
def authorization_header(http_method, uri)
{ 'auth_token' => ActiveResource::Base.token }
end
end
end
Recently we figured out there was some issues and thought not to use class variables. Then we need some way to access session inside authorization_header method. While searching for a solution we came into request_store gem.
Request Store
Request store gem helps to store a global state in Rails app in a thread safe way. We can use it like
def index
RequestStore.store[:foo] ||= 0
RequestStore.store[:foo] += 1
render :text => RequestStore.store[:foo]
end
Then we updated our code to use request_store.
# app/controllers/application_controller.rb
class ApplicationController < ActionController::Base
before_filter :store_user
private
def store_user
RequestStore.store[:user] = session[:user]
end
end
# In ActiveResource::Connection#authorization_header patch
module ActiveResource
class Connection
def authorization_header(http_method, uri)
if ::RequestStore.store[:user].present?
{ 'auth_token' => ::RequestStore.store[:user].auth_token }
else
{}
end
end
end
end
Now it is working fine, But I would like to know your comments on this.
Thanks.