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#!/usr/bin/env ruby
$: << File.dirname(__FILE__)+'/../lib'
require 'goliath'
require 'em-synchrony/em-http'
require 'yajl/json_gem' if RUBY_PLATFORM != 'java'
#
# Here's a way to make an asynchronous request in the middleware, and only
# proceed with the response when both the endpoint and our middleware's
# responses have completed.
#
# To run this, start the 'test_rig.rb' server on port 9002:
#
# bundle exec ./examples/test_rig.rb -sv -p 9002
#
# And then start this server on port 9000:
#
# bundle exec ./examples/barrier_aroundware_demo.rb -sv -p 9000
#
# Now curl the async_aroundware_demo_multi:
#
# $ time curl 'http://127.0.0.1:9000/?delay_1=1.0&delay_2=1.5'
# { "results": {
# "sleep_2": { "delay": 1.5, "actual": 1.5085558891296387 },
# "sleep_1": { "delay": 1.0, "actual": 1.0098700523376465 }
# } }
#
# The requests are run concurrently:
#
# $ ./examples/async_aroundware_demo.rb -sv -p 9000 -e prod &
# [68463:INFO] 2011-05-03 23:13:03 :: Starting server on 0.0.0.0:9000 in production mode. Watch out for stones.
# $ ab -n10 -c10 'http://127.0.0.1:9000/?delay_1=1.5&delay_2=2.0'
# Connection Times (ms)
# min mean[+/-sd] median max
# Connect: 0 0 0.1 0 0
# Processing: 2027 2111 61.6 2112 2204
# Waiting: 2027 2111 61.5 2112 2204
# Total: 2027 2112 61.5 2113 2204
#
#
BASE_URL = 'http://localhost:9002/'
class RemoteRequestBarrier
include Goliath::Rack::BarrierAroundware
attr_accessor :sleep_1
def pre_process
# Request with delay_1 and drop_1 -- note: 'aget', because we want execution to continue
req = EM::HttpRequest.new(BASE_URL).aget(:query => { :delay => env.params['delay_1'], :drop => env.params['drop_1'] })
enqueue :sleep_1, req
return Goliath::Connection::AsyncResponse
end
def post_process
# unify the results with the results of the API call
if successes.include?(:sleep_1) then body[:results][:sleep_1] = JSON.parse(sleep_1.response)
else body[:errors][:sleep_1] = sleep_1.error ; end
[status, headers, JSON.pretty_generate(body)]
end
end
class BarrierAroundwareDemo < Goliath::API
use Goliath::Rack::Params
use Goliath::Rack::Validation::NumericRange, {:key => 'delay_1', :default => 1.0, :max => 5.0, :min => 0.0, :as => Float}
use Goliath::Rack::Validation::NumericRange, {:key => 'delay_2', :default => 0.5, :max => 5.0, :min => 0.0, :as => Float}
#
use Goliath::Rack::BarrierAroundwareFactory, RemoteRequestBarrier
def response(env)
# Request with delay_2 and drop_2 -- note: 'get', because we want execution to proceed linearly
resp = EM::HttpRequest.new(BASE_URL).get(:query => { :delay => env.params['delay_2'], :drop => env.params['drop_2'] })
body = { :results => {}, :errors => {} }
if resp.response_header.status.to_i != 0
body[:results][:sleep_2] = JSON.parse(resp.response) rescue 'parsing failed'
else
body[:errors ][:sleep_2] = resp.error
end
[200, { }, body]
end
end