I use free heroku instance to run my Dashing project. In result, it looses the value passed previously, when my instance sleeps. I was recommended to use Redis to keep history. I tryed to follow the instruction given here. In result I got the following config.ru (as part of my dashing project):
require 'dashing'
require 'redis-objects'
require 'yaml'
configure do
set :auth_token, 'my-token'
set :default_dashboard, 'def' # https://github.com/Shopify/dashing/wiki/How-To:-Change-the-default-dashboard
helpers do
def protected!
# Put any authentication code you want in here.
# This method is run before accessing any resource.
end
end
end
def redis?
ENV.has_key? 'REDISTOGO_URL'
end
if redis?
redis_uri = URI.parse(ENV['REDISTOGO_URL'])
Redis.current = Redis.new(:host => redis_uri.host,
:port => redis_uri.port,
:password => redis_uri.password)
set :history, Redis::HashKey.new('dashing-history')
elsif File.exists?(settings.history_file)
set history: YAML.load_file(settings.history_file)
else
set history: {}
end
map Sinatra::Application.assets_prefix do
run Sinatra::Application.sprockets
end
run Sinatra::Application
and the following Gemfile:
source 'https://rubygems.org'
gem 'dashing'
gem 'redis-objects'
## Remove this if you don't need a twitter widget.
gem 'twitter', '>= 5.9.0'
But it didn't help. What I did incorrectly?
I also tried to use this tutorial. But it was giving me an error at line redis_uri = URI.parse(ENV["REDISTOGO_URL"]) (something like wrong url is given).
The problem was that the app requires the add-on Redis To Go
If Redis To Go is configured, REDISTOGO_URL is added to environment variables, it will work
For more information on how to setup Redis To Go, read the heroku article
Adding Redis to an application provides benefits, you may be using RedisToGo to power simple Resque or Sidekiq jobs, or using the raw power of Redis 2.6 Lua Scripting to do some crazy fast operations. Redis can be used a database, but it’s often used as a complementary datastore. With over 140 commands, the possibilities are endless.
Related
tl;dr How can I get a single Sinatra app to start up very differently on different servers via customizations to config.ru?
Background
I have a single web application written using Sinatra that's run on different servers. Currently the codebase for these servers is forked because there are some non-trivial differences in the way (discrete) parts of them work. For example:
one server authenticates users via an intranet LDAP server, while another server uses a simpler local database table lookup.
one server uses an external cron job to periodically update some statistics, while another (Windows-based) server uses an internal sleepy Thread.
one server stores certain metadata in a local table, while another server pulls the metadata from an external Wiki via screen scraping (!).
…and so on.
I'd like to get these code bases completely shared (single Git repo). I envision that each server would have one slightly-differing configuration file that causes the app to be started up differently.
Abandoned Solutions
I could change the behavior of the app based on environment variables. As there are a not-tiny number of variations in behavior, I'd rather not hide the settings in environment variables.
I could create my own "server-settings.rb" file that is unique to each machine, require it in my app.rb, and then change the configuration there. However, this seems to possibly be re-inventing the wheel. I already have a file named config.ru for each server. Shouldn't I be using this?
The Current Code
My config.ru for the app currently is simply:
require ::File.join( ::File.dirname(__FILE__), 'app' )
run MyApp.new
And the app.rb that it requires is, in essence:
require 'sinatra'
require_relative 'helpers/login' # customized for LDAP lookup on this server
class MyApp < Sinatra::Application
use Rack::Session::Cookie, key:'foo.bar', path:'/', secret:'ohnoes'
set :protection, except: [:path_traversal, :session_hijacking]
configure :production do
# run various code that depends on server settings, e.g.
Snapshotter.start # there is no cron on this machine, so we do it ourselves
end
configure :development do
# run various code that depends on server settings
end
end
The Question
I'd like to make config.ru live up to its name, and have it look something like this:
require ::File.join( ::File.dirname(__FILE__), 'app' )
run MyApp.new( auth: :ldap, snapshot:false, metadata: :remote_wiki, … )
How can I modify my application to change its configuration behavior based on settings supplied via config.ru? Or is this an abuse of config.ru, trying to use it for totally the wrong thing?
As soon as I started reading the question the first answer to pop into my head was "environment variable" but you scotched that straight away :)
I'll go with a mixture of one of your coulds and the desired outcome code, as it's how I structure things…
Because I want to be able to test my applications more easily, I take most of the Ruby out of the config.ru and into a separate config.rb file and leave config.ru to be a bootstrap file. So my standard skel is:
config.ru
# encoding: UTF-8
require 'rubygems'
require 'bundler'
Bundler.setup
root = File.expand_path File.dirname(__FILE__)
require File.join( root , "./app/config.rb" )
# everything was moved into a separate module/file to make it easier to set up tests
map "/" do
run APP_NAME.app
end
app/config.rb
# encoding: utf-8
require_relative File.expand_path(File.join File.dirname(__FILE__), "../lib/ext/warn.rb")
require_relative "./init.rb" # config
require_relative "./main.rb" # routes and helpers
require 'encrypted_cookie'
# standard cookie settings
COOKIE_SETTINGS = {
:key => 'usr',
:path => "/",
:expire_after => 86400, # In seconds, 1 day
:secret => ENV["LLAVE"],
:httponly => true
}
module APP_NAME # overall name of the app
require 'rack/ssl' # force SSL
require 'rack/csrf'
if ENV["RACK_ENV"] == "development"
require 'pry'
require 'pry-nav'
end
# from http://devcenter.heroku.com/articles/ruby#logging
$stdout.sync = true
ONE_MONTH = 60 * 60 * 24 * 30
def self.app
Rack::Builder.app do
cookie_settings = COOKIE_SETTINGS
# more security if in production
cookie_settings.merge!( :secure => true ) if ENV["RACK_ENV"] == "production"
# AES encryption of cookies
use Rack::Session::EncryptedCookie, cookie_settings
if ENV["RACK_ENV"] == "production"
use Rack::SSL, :hsts => {:expires => ONE_MONTH}
end
# to stop XSS
use Rack::Csrf, :raise => true unless ENV["RACK_ENV"] == "test"
run App # the main Sinatra app
end
end # self.app
end # APP_NAME
The initial reason I did this was making it easy to run the app in specs:
shared_context "All routes" do
include Rack::Test::Methods
let(:app){ APP_NAME.app }
end
but it makes sense to me to keep this code with the rest of the application code, so to speak, as I can bundle things together, run other apps etc. I've used this to conditionally load different examples into the specs in a few projects (it helps cut down on duplicated effort and check the examples really work), so I don't see why you couldn't use it to conditionally load configurations.
This way you get to choose to use a conditional in the config.ru as to which config.rb file you would use, or use an env var in the config.rb as to which definiton of self.app to use , or pass in an options hash to self.app…
With your set up I'd rename the APP_NAME module to MyApp, and the Sinatra class to App (because quite often I'll have an website that runs a front end and an API, so the Sinatra classes get named by their function (App, API etc) and wrapped in a module named after the site) and end up with:
config.ru
map "/" do
run MyApp.app( auth: :ldap, snapshot:false, metadata: :remote_wiki )
end
config.rb
def self.app( opts={} )
opts = DEFAULT_OPTIONS.merge opts
# …
run App
end
It'll be interesting to see how other people tackle this.
I just implemented Compass configuration for my Sinatra app but when I change the environment to :test or :production and modify my files like screen.sass or index.haml my changes are not reflected when I reload the page so I need to run my app again?
Is it normal? Is is just me?
This is how my app.rb file looks like:
require 'sinatra'
require 'haml'
require 'sass'
require 'compass'
require './helpers.rb'
configure do
set :environment, :test
Compass.configuration do |config|
settings.environment == :production ?
config.output_style = :compressed :
config.output_style = :nested
settings.environment == :development ?
config.line_comments = true :
config.line_comments = false
end
set :sass, Compass.sass_engine_options
end
before do
#js = 'javascript:;'
end
get '/scripts/jquery.js' do
# Downloads the latest jQuery 1.x version when needed. Requires to reload the page after done.
`curl "https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js" >> public/scripts/jquery.js`
end
get '/styles/:name.css' do
sass :"styles/#{params[:name]}"
end
get '/?' do
haml :index
end
get '/:page/?' do
haml params[:page].to_sym
end
Any idea?
Generally, if you make a change to a running Sinatra application, you have to restart the application, as the program has already been loaded to memory.
There are options for automatically detecting changes and restarting the application on the Sinatra FAQ.
Since Shotgun fix the issue partially (reloading the files for your at production, maybe try with Sinatra::Reloader which, IMHO, works better than Shotgun.
Maybe something like (not tested)
require "sinatra"
configure(:production) do |c|
require "sinatra/reloader"
c.also_reload "*.sass", "*.haml"
end
That being said, are you sure you do need this kind of behavior on a production/test environment for updating? Development env. should be (at least, for what I use it for) for this kind of hot testing.
I used to use sinatra::reloader
but I didn't like the huge dependencies incurred (as should we all be mindful how many gems get activated)
pistol ( at a tender age of ver 0.0.2) and I think does the required job nicely
I use shotgum gem for this.
gem install shotgun
then
shotgun app.rb
from within the app dir
this then reloads the app per request, rather than holding the whole thing in memory. you access the site on localhost:9393
Where does the concept of 'development mode' come from when using ruby + webrick + sinatra?
require 'sinatra'
require 'sinatra/reloader'
get '/test' do
development?.to_s
end
When I run the above app by 'ruby test.rb -p 3000' http://localhost:3000/test returns "true" ... but why does it return true? Is development mode a ruby, webrick, rack or sinatra concept? Also, is this functionality documented anywhere in particular in a non-rails specific manner? I'm finding many people reference the concept of development mode, but I've been surprised by how hard it has been to find relevant information ... maybe I'm just not google-ing the right keywords ...
Sinatra's source code (base.rb) shows these 3 definitions:
def development?; environment == :development end
def production?; environment == :production end
def test?; environment == :test end
So those true/false methods are based on the set environment. Sinatra defaults to run in development mode unless you tell it otherwise (when you start a Sinatra app, you'll see something like
== Sinatra/1.2.6 has taken the stage on 4567 for **development** with backup from WEBrick".
To tell it to run in production, you would do this:
ruby test.rb -p 3000 -e production
I am trying to setup rack-offline in Sinatra, but I am having trouble setting it up. In rails it is prettty easy, but have no found any examples in Sinatra...
Basically, in your config.ru, map /application.manifest to Rack::Offline. (If you're not familiar with using config.ru with your Sinatra application, check out this part of Sinatra docs.) Here's an example, which caches all the files under directory public:
require 'your-app'
require 'rack/offline'
map "/application.manifest" do
offline = Rack::Offline.new :cache => true, :root => "public" do
# Cache all files under the directory public
Dir[File.join(settings.public, "**/*")].each do |file|
cache file.sub(File.join(settings.public, ""), "")
end
# All other files should be downloaded
network '/'
end
run offline
end
map "/" do
run Sinatra::Application
end
Remember to set manifest="/application.manifest" in your html tag and you should be good to go. You should take a look at rack-offline's README for more documentation and explanation of how it works.
I've set up Rack::Reload according to this thread
# config.ru
require 'rubygems'
require 'sinatra'
set :environment, :development
require 'app'
run Sinatra::Application
# app.rb
class Sinatra::Reloader < Rack::Reloader
def safe_load(file, mtime, stderr = $stderr)
if file == Sinatra::Application.app_file
::Sinatra::Application.reset!
stderr.puts "#{self.class}: reseting routes"
end
super
end
end
configure(:development) { use Sinatra::Reloader }
get '/' do
'foo'
end
Running with thin via thin start -R config.ru, but it only reloads newly added routes. When I change already existing route, it still runs the old code.
When I add new route, it correctly reloads it, so it is accessible, but it doesn't reload anything else.
For example, if I changed routes to
get '/' do
'bar'
end
get '/foo' do
'baz'
end
Than / would still serve foo, even though it has changed, but /foo would correctly reload and serve baz.
Is this normal behavior, or am I missing something? I'd expect whole source file to be reloaded. The only way around I can think of right now is restarting whole webserver when filesystem changes.
I'm running on Windows Vista x64, so I can't use shotgun because of fork().
You could try sinatra-reloader, which is known to work well on Windows (also, it's faster than shotgun).
This works:
# config.ru
require 'rubygems'
require 'app'
set :environment, :development
run Sinatra::Application
# app.rb
require 'sinatra'
class Sinatra::Reloader < Rack::Reloader
def safe_load(file, mtime, stderr = $stderr)
if file == File.expand_path(Sinatra::Application.app_file)
::Sinatra::Application.reset!
stderr.puts "#{self.class}: reseting routes"
end
super
end
end
configure(:development) { use Sinatra::Reloader }
get '/' do
'foo'
end
It matters from where you have the require statement. But I find the following solution more elegant and robust:
# config.ru
require 'rubygems'
require 'sinatra'
require 'rack/reloader'
require 'app'
set :environment, :development
use Rack::Reloader, 0 if development?
run Sinatra::Application
# app.rb
Sinatra::Application.reset!
get '/' do
'foo'
end
Does Shotgun not work on Windows?
From the README:
Shotgun
This is an automatic reloading version of the rackup command that's shipped with
Rack. It can be used as an alternative to the complex reloading logic provided
by web frameworks or in environments that don't support application reloading.
The shotgun command starts one of Rack's supported servers (e.g., mongrel, thin,
webrick) and listens for requests but does not load any part of the actual
application. Each time a request is received, it forks, loads the application in
the child process, processes the request, and exits the child process. The
result is clean, application-wide reloading of all source files and templates on
each request.
You can also try using Trinidad a JRuby Rack container based on Tomcat. In my experience it does change reloading by default without having to modify your source files. Bloody fast too. Obviously no good if you are using native libraries, but if you are deploying on Windows you are probably used to adopting a pure-ruby approach.
Its syntax is just as simple as the thin approach:
jruby -S trinidad -r config.ru
There is no Java specific yak shaving (i.e. creating web.xml or WARing up your Ruby app) and the gem is simple to install.