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sinatra with simple worker and queue
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require 'rack' | |
require 'sinatra/base' | |
require 'uuidtools' | |
require 'rest-client' | |
require 'eventmachine' | |
require 'json' | |
require_relative './cache' | |
class Worker < EM::Connection | |
attr_reader :query | |
def receive_data(data) | |
Thread.new { | |
query_id, url = JSON::parse(data) | |
puts 'W: Received [%s][%s]' % [query_id, url] | |
notify(query_id, {:status => 'received'}) | |
result = RestClient.get url | |
notify(query_id, {:status => 'processing'}) | |
sleep 30 # Simulate that we're doing something for 30 seconds | |
puts 'W: Processed [%s][%s]' % [query_id, url] | |
notify(query_id, {:status => 'finished', :results => result.to_s}) | |
} | |
end | |
private | |
def notify(query_id, result) | |
RestClient.post 'http://localhost:4567/broker/%s/results' % query_id, result.to_json, :content_type => 'text/html' | |
end | |
end | |
class Broker | |
def initialize(app, options = {}) | |
@app = app | |
puts "B: Starting broker" | |
EM::next_tick do | |
@server = EM::connect('127.0.0.1', 4000, Worker, self) | |
end | |
end | |
def call(env) | |
env['broker'] = @server | |
@app.call(env) | |
end | |
end | |
class App < Sinatra::Base | |
use Rack::CommonLogger | |
use Broker | |
set server: 'thin' | |
enable :xhtml | |
enable :dump_errors | |
enable :show_errors | |
disable :show_exceptions | |
helpers do | |
def broker; env['broker']; end | |
end | |
post '/query' do | |
worker_id = UUIDTools::UUID.timestamp_create.to_s | |
broker.send_data([worker_id, params[:url]].to_json) | |
[202, { 'Location' => url('/worker/%s/results' % worker_id) }, ''] | |
end | |
post '/broker/:id/results' do | |
[201, {}, Cache[params[:id]] = request.body.read] | |
end | |
get '/broker/:id/results', provides: 'text/event-stream' do | |
worker_id = params[:id] | |
stream :keep_open do |out| | |
timer = EventMachine::PeriodicTimer.new(1) do | |
result = Cache[worker_id] || { :status => 'queued' } | |
out << result | |
timer.cancel if JSON::parse(result)['status'] == 'finished' | |
end | |
out.callback { timer.cancel } | |
out.errback { timer.cancel } | |
end | |
end | |
end | |
EM::run { | |
EventMachine::start_server '127.0.0.1', '4000', Worker | |
App.run! | |
} |
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