How to run multiple Sinatra instances without anything else? - ruby

Question

I want to spawn a lot of configurable Sinatra servers.
For example:
require 'sinatra/base'
class AwesomeOne
def initialize port
#sapp = Sinatra.new {
set :port => port
get '/'do
"Hi!"
end
}
end
def run!
#sapp.run!
end
end
and then:
ths = []
(1111..9999).each { |port|
ths.push Thread.new { AwesomeOne.new(port).run! }
}
But something goes wrong: i can't access each page. But some of them seems accessible.
So, how to run Sinatra multiple times in one .rb file?

Answer 1

I happen to need the same thing soon so I did some research.
You could use Sinatra's cascade, routing or middleware options, see https://www.safaribooksonline.com/library/view/sinatra-up-and/9781449306847/ch04.html and search for 'multiple', I advise you to buy the book and read it, it is all very usefull stuff !
But more leaning to your approach you can use the eventmachine Sinatra allready uses to run multiple apps on different ports, Ruby itself is started only once.
See http://recipes.sinatrarb.com/p/embed/event-machine for explanation and more examples. I combined the example with your code.
# adapted from http://recipes.sinatrarb.com/p/embed/event-machine
require 'eventmachine'
require 'sinatra/base'
require 'thin'
def run(opts)
EM.run do
server = opts[:server] || 'thin'
host = opts[:host] || '0.0.0.0'
port = opts[:port] || '8181'
web_app = opts[:app]
dispatch = Rack::Builder.app do
map '/' do
run web_app
end
end
unless ['thin', 'hatetepe', 'goliath'].include? server
raise "Need an EM webserver, but #{server} isn't"
end
Rack::Server.start({
app: dispatch,
server: server,
Host: host,
Port: port,
signals: false,
})
end
end
class HelloApp < Sinatra::Base
configure do
set :threaded, true
end
get '/hello' do
"Hello World from port #{request.port}"
end
end
ths = []
(4567..4569).each do |port|
ths.push Thread.new { run app: HelloApp.new, port: port }
end
ths.each{|t| t.join}
output
Thin web server (v1.6.3 codename Protein Powder)
Maximum connections set to 1024
Listening on 0.0.0.0:4567, CTRL+C to stop
Thin web server (v1.6.3 codename Protein Powder)
Maximum connections set to 1024
Listening on 0.0.0.0:4568, CTRL+C to stop
Thin web server (v1.6.3 codename Protein Powder)
Maximum connections set to 1024
Listening on 0.0.0.0:4569, CTRL+C to stop
In windows cmd netstat -ab this gives
TCP 0.0.0.0:4567 ******:0 LISTENING
TCP 0.0.0.0:4568 ******:0 LISTENING
TCP 0.0.0.0:4569 ******:0 LISTENING
And the hello example on all ports works.