Class: BarnyardCcfeeder::CacheCow

Inherits:
Object
  • Object
show all
Defined in:
lib/barnyard_ccfeeder.rb

Constant Summary collapse

CACHE_TIME = 
4
RETRY_INTERVAL = 
10
MAX_RETRIES =

0 * 24 * 60 * 60 / RETRY_INTERVAL # retry for 30 days max.

3

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args) ⇒ CacheCow

Returns a new instance of CacheCow.



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# File 'lib/barnyard_ccfeeder.rb', line 22

def initialize(args)


  @debug = args.fetch(:debug) { false }
  @log = args.fetch(:logger) { Logger.new(STDOUT) }

  @secret_key = args.fetch(:secret_key) { "" }
  @url = args.fetch(:url) { raise "You must provide :url" }

  @max_retries = args.fetch(:max_retries) { MAX_RETRIES }
  @retry_interval = args.fetch(:retry_interval) { RETRY_INTERVAL }
  @cache_time = args.fetch(:cache_time) { CACHE_TIME }

  @resource = RestClient::Resource.new @url

  @crops_time = Time.now
  @subscribers_time = Time.now
  @subscriptions_time = Time.now

  @crops_by_crop_number_cache = Hash.new

  @connected = false
  @retries = 0

  while !@connected && (@retries < @max_retries)
    @retries += 1
    begin
      # Try and load the crops to make sure we have a connection
      #          YAML::ENGINE.yamler = 'syck'
      Crack::JSON.parse(@resource["crops.json"].get)
      @connected = true
    rescue
      @log.fatal "(#{@retries}/#{@max_retries}) Unable to obtain connection to #{@url}/crops.json"
      sleep 2
    end
  end

  load_crops
  load_subscribers
  load_subscriptions

end

Instance Attribute Details

#crops_by_crop_number_cache ⇒ Object (readonly)

Returns the value of attribute crops_by_crop_number_cache.



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# File 'lib/barnyard_ccfeeder.rb', line 17

def crops_by_crop_number_cache
  @crops_by_crop_number_cache
end

#crops_cache ⇒ Object (readonly)

Returns the value of attribute crops_cache.



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# File 'lib/barnyard_ccfeeder.rb', line 17

def crops_cache
  @crops_cache
end

#crops_time ⇒ Object (readonly)

Returns the value of attribute crops_time.



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# File 'lib/barnyard_ccfeeder.rb', line 17

def crops_time
  @crops_time
end

#subscribers_cache ⇒ Object (readonly)

Returns the value of attribute subscribers_cache.



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# File 'lib/barnyard_ccfeeder.rb', line 17

def subscribers_cache
  @subscribers_cache
end

#subscribers_time ⇒ Object (readonly)

Returns the value of attribute subscribers_time.



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# File 'lib/barnyard_ccfeeder.rb', line 17

def subscribers_time
  @subscribers_time
end

#subscriptions_cache ⇒ Object (readonly)

Returns the value of attribute subscriptions_cache.



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# File 'lib/barnyard_ccfeeder.rb', line 17

def subscriptions_cache
  @subscriptions_cache
end

#subscriptions_time ⇒ Object (readonly)

Returns the value of attribute subscriptions_time.



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# File 'lib/barnyard_ccfeeder.rb', line 17

def subscriptions_time
  @subscriptions_time
end

Instance Method Details

#calc(secret_key, payload) ⇒ Object

private



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# File 'lib/barnyard_ccfeeder.rb', line 307

def calc(secret_key, payload)

  digest = OpenSSL::Digest::Digest.new('sha1')

  sig = OpenSSL::HMAC.hexdigest(digest, secret_key, payload)

  return sig

end

#crops ⇒ Object 



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# File 'lib/barnyard_ccfeeder.rb', line 145

def crops

  if (@crops_time + CACHE_TIME) > Time.now
    @log.debug "Using cached #{@url}/crops.json"
    return @crops_cache
  end

  load_crops
  return @crops_cache

end

#crops_by_crop_number ⇒ Object 



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# File 'lib/barnyard_ccfeeder.rb', line 133

def crops_by_crop_number

  if (@crops_time + CACHE_TIME) > Time.now
    @log.debug "Using cached #{@url}/crops.json"
    return @crops_by_crop_number_cache
  end

  load_crops
  return @crops_by_crop_number_cache

end

#deliver(path, data) ⇒ Object 



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# File 'lib/barnyard_ccfeeder.rb', line 317

def deliver(path, data)

  raw_deliver "#{@url}/#{path}", data

end

#get_subscriber(subscriber_id) ⇒ Object 



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# File 'lib/barnyard_ccfeeder.rb', line 194

def get_subscriber(subscriber_id)
  # I don't like this, but I will fix it later...
  subscribers.each do |s|
    return s if subscriber_id == s["id"]
  end
  nil
end

#has_subscribers(crop_number) ⇒ Object

Note that just function must return the subscription id…



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# File 'lib/barnyard_ccfeeder.rb', line 203

def has_subscribers(crop_number)
  subscribed = Array.new

  subscriptions.each do |id, data|

    if data["crop"]["crop_number"].to_i == crop_number.to_i
      subscribed << data
    end
  end
  subscribed
end

#load_crops ⇒ Object 



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# File 'lib/barnyard_ccfeeder.rb', line 65

def load_crops
  begin
#        YAML::ENGINE.yamler = 'syck'
    crops = Crack::JSON.parse(@resource["crops.json"].get)

    @log.debug "Getting #{@url}/crops.json"

    @crops_cache = Hash.new

    crops.each do |crop|
      @crops_cache[crop["id"]] = crop
      @crops_by_crop_number_cache[crop['crop_number']] = crop
    end

    @crops_time = Time.now

  rescue
    @log.warn "Unable to get crops.json, using cached copy"
  end

end

#load_subscribers ⇒ Object 



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# File 'lib/barnyard_ccfeeder.rb', line 87

def load_subscribers
  begin
#        YAML::ENGINE.yamler = 'syck'
    subscribers = Crack::JSON.parse(@resource["subscribers.json"].get)

    @log.debug "Getting #{@url}/subscribers.json"

    @subscribers_cache = Hash.new

    subscribers.each do |subscriber|
      @subscribers_cache[subscriber['id']] = subscriber
    end

    @subscribers_time = Time.now

  rescue
    @log.warn "Unable to get subscribers.json, using cached copy"
  end
end

#load_subscriptions ⇒ Object 



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# File 'lib/barnyard_ccfeeder.rb', line 107

def load_subscriptions
  begin
#        YAML::ENGINE.yamler = 'syck'
    subscriptions = Crack::JSON.parse(@resource["subscriptions.json"].get)

    @log.debug "Getting #{@url}/subscriptions.json"

    @subscriptions_cache = Hash.new

    self.crops if @crops_cache.empty?
    self.subscribers if @subscribers_cache.empty?

    subscriptions.each do |subscription|
      subscription['crop'] = @crops_cache[subscription['crop_id']]
      subscription['subscriber'] = @subscribers_cache[subscription['subscriber_id']]
      @subscriptions_cache[subscription['id']] = subscription
    end

    @subscriptions_time = Time.now

  rescue
    @log.warn "Unable to get subscriptions.json, using cached copy"
  end

end

#push_change(queued_at, harvester_uuid, change_uuid, crop_number, primary_key, transaction_type, value, old_value) ⇒ Object

a “change” is detected by the harvester



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# File 'lib/barnyard_ccfeeder.rb', line 216

def push_change(queued_at, harvester_uuid, change_uuid, crop_number, primary_key, transaction_type, value, old_value)

  data = Hash.new

  data['harvester_uuid'] = harvester_uuid
  data['crop_number'] = crop_number
  data['queue_time'] = queued_at
  data['primary_key'] = primary_key

  begin
#        YAML::ENGINE.yamler = 'syck'
    data['previous_value'] = old_value
  rescue Exception => e
    data['previous_value'] = ""
  end

  begin
#        YAML::ENGINE.yamler = 'syck'
    data['current_value'] = value
  rescue Exception => e
    data['current_value'] = ""
  end

  data['uuid'] = change_uuid
  data['transaction_type'] = transaction_type

  change = Hash.new
  change["change"] = data

  return deliver("changes", change)

end

#push_delivery_status(queued_at, delivery_uuid, transaction_uuid, endpoint_response_code, endpoint_response_header, endpoint_response_data, endpoint_response_date) ⇒ Object 



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# File 'lib/barnyard_ccfeeder.rb', line 266

def push_delivery_status(queued_at, delivery_uuid, transaction_uuid, endpoint_response_code, endpoint_response_header, endpoint_response_data, endpoint_response_date)

  data = Hash.new

  data['queue_time'] = queued_at
  data['uuid'] = delivery_uuid
  data['transaction_uuid'] = transaction_uuid
  data['endpoint_response_code'] = endpoint_response_code
  data['endpoint_response_header'] = endpoint_response_header
  data['endpoint_response_data'] = endpoint_response_data
  data['endpoint_response_date'] = endpoint_response_date

  delivery = Hash.new
  delivery["delivery"] = data

  return deliver("deliveries", delivery)

end

#push_harvester_stats(harvester_uuid, crop_number, began_at, ended_at, total_records, number_of_changes, number_of_adds, number_of_deletes) ⇒ Object 



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# File 'lib/barnyard_ccfeeder.rb', line 285

def push_harvester_stats(harvester_uuid, crop_number, began_at, ended_at, total_records, number_of_changes, number_of_adds, number_of_deletes)

  data = Hash.new

  data['uuid'] = harvester_uuid
  data['crop_number'] = crop_number
  data['began_at'] = began_at
  data['ended_at'] = ended_at
  data['total_records'] = total_records
  data['number_of_changes'] = number_of_changes
  data['number_of_adds'] = number_of_adds
  data['number_of_deletes'] = number_of_deletes

  harvest = Hash.new
  harvest["harvest"] = data

  return deliver("harvests", harvest)

end

#push_transaction(subscription_id, queued_at, change_uuid, transaction_uuid) ⇒ Object

a “transaction” is sent to a subscriber by the farmer based on the “change”



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# File 'lib/barnyard_ccfeeder.rb', line 250

def push_transaction(subscription_id, queued_at, change_uuid, transaction_uuid)

  data = Hash.new

  data['subscription_id'] = subscription_id
  data['queue_time'] = queued_at
  data['change_uuid'] = change_uuid
  data['uuid'] = transaction_uuid

  transaction = Hash.new
  transaction["transaction"] = data

  return deliver("transactions", transaction)

end

#raw_deliver(path, data) ⇒ Object 



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# File 'lib/barnyard_ccfeeder.rb', line 324

def raw_deliver(path, data)

  payload = data.to_json

  @delivered = false
  @retries = 0

  result = {:code => 0, :headers => String.new, :body => String.new}

  while !@delivered && (@retries < @max_retries)
    @retries += 1
    begin

      end_point = RestClient::Resource.new path

      sig = calc @secret_key, payload

      headers_to_send = {:content_type => :json, :accept => :json}
      headers_to_send["X_HUB_SIGNATURE"] = sig unless @secret_key.empty?
      response = end_point.post payload, headers_to_send

      @log.debug headers_to_send.inspect

      if (200..201) === response.code
        @delivered = true
        @log.info "Payload delivered to #{path} #{response.code}"

        result[:code] = response.code
        result[:headers] = response.headers
        result[:body] = response.body

        return result
      else
        @log.warn "#{response.code}"

        @log.warn "Retrying #{@retries}/#{@max_retries} in  #{@retry_interval} seconds..."

        sleep RETRY_INTERVAL
      end
    rescue Exception => e
      @log.fatal "ERROR: #{e}"

      @log.fatal "Retrying #{@retries}/#{@max_retries} in  #{@retry_interval} seconds..."
    end

  end # while

  return result

end

#subscribed?(subscriber_id, crop_number) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/barnyard_ccfeeder.rb', line 181

def subscribed?(subscriber_id, crop_number)

  @subscriptions_cache.each do |id, subscription|

    if subscription["subscriber_id"] == subscriber_id && subscription["crop"]["crop_number"].to_i == crop_number.to_i
      return true
    end
  end

  false

end

#subscribers ⇒ Object 



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# File 'lib/barnyard_ccfeeder.rb', line 157

def subscribers

  if (@subscribers_time + CACHE_TIME) > Time.now
    @log.debug "Using cached #{@url}/subscribers.json"
    return @subscribers_cache
  end

  load_subscribers
  return @subscribers_cache

end

#subscriptions ⇒ Object 



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# File 'lib/barnyard_ccfeeder.rb', line 169

def subscriptions

  if (@subscriptions_time + CACHE_TIME) > Time.now
    @log.debug "Using cached #{@url}/subscriptions.json"
    return @subscriptions_cache
  end

  load_subscriptions
  return @subscriptions_cache

end