How to exit from async call when url timeout with ruby/curb - ruby

Question

I am using Ruby curb to call multiple urls at once, e.g.
require 'rubygems'
require 'curb'
easy_options = {:follow_location => true}
multi_options = {:pipeline => true}
Curl::Multi.get(['http://www.example.com','http://www.trello.com','http://www.facebook.com','http://www.yahoo.com','http://www.msn.com'], easy_options, multi_options) do|easy|
# do something interesting with the easy response
puts easy.last_effective_url
end
The problem I have is I want to break the subsequent async calls when any url timeout occurred, is it possible?

Answer 1

As far as I know the current API doesn't expose the Curl::Multi instance, since otherwise you could do:
stop_everything = proc { multi.cancel! }
multi = Curl::Multi.get(array_of_urls, on_failure: stop_everything)
The easiest way might be to patch the Curl::Multi.http to return the m variable.
See https://github.com/taf2/curb/blob/master/lib/curl/multi.rb#L85

Answer 2

I think this will do exactly what you ask for:
require 'rubygems'
require 'curb'
responses = {}
requests = ['http://www.example.com','http://www.trello.com','http://www.facebook.com','http://www.yahoo.com','http://www.msn.com']
m = Curl::Multi.new
requests.each do |url|
responses[url] = ""
c = Curl::Easy.new(url) do|curl|
curl.follow_location = true
curl.on_body{|data| responses[url] << data; data.size }
curl.on_success {|easy| puts easy.last_effective_url }
curl.on_failure {|easy| puts "ERROR:#{easy.last_effective_url}"; #should_stop = true}
end
m.add(c)
end
m.perform { m.cancel! if #should_stop }