Module: Ey::Core::Subscribable

Included in:
Client::Request, Client::Task
Defined in:
lib/ey-core/subscribable.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(klass) ⇒ Object 



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# File 'lib/ey-core/subscribable.rb', line 2

def self.included(klass)
  klass.send(:attribute, :read_channel)
end

Instance Method Details

#read_channel_uri ⇒ Object 



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# File 'lib/ey-core/subscribable.rb', line 6

def read_channel_uri
  self.read_channel && Addressable::URI.parse(self.read_channel)
end

#subscribe(&block) ⇒ Object 



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# File 'lib/ey-core/subscribable.rb', line 10

def subscribe(&block)
  return false unless read_channel_uri

  gem 'faye', '~> 1.1'
  require 'faye' # soft dependency

  # Use the same env variable as faraday to activate debug output
  Faye.logger = Logger.new(STDOUT, level: "DEBUG") if ENV["DEBUG"]

  uri = read_channel_uri

  resource = self

  url          = uri.omit(:query).to_s
  token        = uri.query_values["token"]
  subscription = uri.query_values["subscription"]

  EM.run do
    client = Faye::Client.new(url)
    client.set_header("Authorization", "Token #{token}")
    next_ready_check = Time.now + 5
    handle_output = Proc.new do |m|
      next_ready_check = Time.now + 1
      block.call(m)
    end

    deferred = client.subscribe(subscription) do |message|
      handle_output.call(JSON.load(message))
    end

    deferred.callback do
      handle_output.call({"meta" => true, "created_at" => Time.now,"message" => "log output stream connection established, waiting...\n"})
    end

    deferred.errback do |error|
      handle_output.call({"meta" => true, "created_at" => Time.now, "message" => "failed to stream output: #{error.inspect}\n"})
      EM.stop_event_loop
    end

    EventMachine::PeriodicTimer.new(1) do
      if Time.now > next_ready_check
        if resource.reload.ready?
          handle_output.call({"meta" => true, "created_at" => Time.now, "message" => "#{resource} finished"})
          EM.stop_event_loop
        end
        next_ready_check = Time.now + 5
      end
    end
  end
end