Class: Optimizely::Project

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(datafile, event_dispatcher = nil, logger = nil, error_handler = nil, skip_json_validation = false) ⇒ Project

Returns a new instance of Project.



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# File 'lib/optimizely.rb', line 40

def initialize(datafile, event_dispatcher = nil, logger = nil, error_handler = nil, skip_json_validation = false)
  # Constructor for Projects.
  #
  # datafile - JSON string representing the project.
  # event_dispatcher - Provides a dispatch_event method which if given a URL and params sends a request to it.
  # logger - Optional param which provides a log method to log messages. By default nothing would be logged.
  # error_handler - Optional param which provides a handle_error method to handle exceptions.
  #                 By default all exceptions will be suppressed.
  # skip_json_validation - Optional boolean param to skip JSON schema validation of the provided datafile.

  @is_valid = true
  @logger = logger || NoOpLogger.new
  @error_handler = error_handler || NoOpErrorHandler.new
  @event_dispatcher = event_dispatcher || EventDispatcher.new

  begin
    validate_instantiation_options(datafile, skip_json_validation)
  rescue InvalidInputError => e
    @is_valid = false
    logger = SimpleLogger.new
    logger.log(Logger::ERROR, e.message)
    return
  end

  begin
    @config = ProjectConfig.new(datafile, @logger, @error_handler)
  rescue
    @is_valid = false
    logger = SimpleLogger.new
    logger.log(Logger::ERROR, InvalidInputError.new('datafile').message)
    return
  end

  unless @config.parsing_succeeded?
    @is_valid = false
    logger = SimpleLogger.new
    logger.log(Logger::ERROR, InvalidDatafileVersionError.new.message)
    return
  end

  @bucketer = Bucketer.new(@config)
  @event_builder = EventBuilderV2.new(@config)
end

Instance Attribute Details

#bucketer ⇒ Object

Returns the value of attribute bucketer.



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# File 'lib/optimizely.rb', line 34

def bucketer
  @bucketer
end

#config ⇒ Object

Returns the value of attribute config.



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# File 'lib/optimizely.rb', line 33

def config
  @config
end

#error_handler ⇒ Object

Returns the value of attribute error_handler.



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# File 'lib/optimizely.rb', line 38

def error_handler
  @error_handler
end

#event_builder ⇒ Object

Returns the value of attribute event_builder.



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# File 'lib/optimizely.rb', line 35

def event_builder
  @event_builder
end

#event_dispatcher ⇒ Object

Returns the value of attribute event_dispatcher.



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# File 'lib/optimizely.rb', line 36

def event_dispatcher
  @event_dispatcher
end

#is_valid ⇒ Object (readonly)

Boolean representing if the instance represents a usable Optimizely Project



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# File 'lib/optimizely.rb', line 31

def is_valid
  @is_valid
end

#logger ⇒ Object

Returns the value of attribute logger.



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# File 'lib/optimizely.rb', line 37

def logger
  @logger
end

Instance Method Details

#activate(experiment_key, user_id, attributes = nil) ⇒ Object 



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# File 'lib/optimizely.rb', line 84

def activate(experiment_key, user_id, attributes = nil)
  # Buckets visitor and sends impression event to Optimizely.
  #
  # experiment_key - Experiment which needs to be activated.
  # user_id - String ID for user.
  # attributes - Hash representing user attributes and values to be recorded.
  #
  # Returns variation key representing the variation the user will be bucketed in.
  # Returns nil if experiment is not Running, if user is not in experiment, or if datafile is invalid.

  unless @is_valid
    logger = SimpleLogger.new
    logger.log(Logger::ERROR, InvalidDatafileError.new('activate').message)
    return nil
  end

  variation_key = get_variation(experiment_key, user_id, attributes)

  if variation_key.nil?
    @logger.log(Logger::INFO, "Not activating user '#{user_id}'.")
    return nil
  end

  # Create and dispatch impression event
  variation_id = @config.get_variation_id_from_key(experiment_key, variation_key)
  impression_event = @event_builder.create_impression_event(experiment_key, variation_id, user_id, attributes)
  @logger.log(Logger::INFO,
              'Dispatching impression event to URL %s with params %s.' % [impression_event.url,
                                                                          impression_event.params])
  begin
    @event_dispatcher.dispatch_event(impression_event)
  rescue => e
    @logger.log(Logger::ERROR, "Unable to dispatch impression event. Error: #{e}")
  end

  variation_key
end

#get_variation(experiment_key, user_id, attributes = nil) ⇒ Object 



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# File 'lib/optimizely.rb', line 122

def get_variation(experiment_key, user_id, attributes = nil)
  # Gets variation where visitor will be bucketed.
  #
  # experiment_key - Experiment for which visitor variation needs to be determined.
  # user_id - String ID for user.
  # attributes - Hash representing user attributes.
  #
  # Returns variation key where visitor will be bucketed.
  # Returns nil if experiment is not Running, if user is not in experiment, or if datafile is invalid.

  unless @is_valid
    logger = SimpleLogger.new
    logger.log(Logger::ERROR, InvalidDatafileError.new('get_variation').message)
    return nil
  end

  unless preconditions_valid?(experiment_key, attributes)
    @logger.log(Logger::INFO, "Not activating user '#{user_id}.")
    return nil
  end

  variation_id = @bucketer.get_forced_variation_id(experiment_key, user_id)

  unless variation_id.nil?
    return @config.get_variation_key_from_id(experiment_key, variation_id)
  end

  unless Audience.user_in_experiment?(@config, experiment_key, attributes)
    @logger.log(Logger::INFO,
                "User '#{user_id}' does not meet the conditions to be in experiment '#{experiment_key}'.")
    return nil
  end

  variation_id = @bucketer.bucket(experiment_key, user_id)
  unless variation_id.nil?
    return @config.get_variation_key_from_id(experiment_key, variation_id)
  end
  nil
end

#track(event_key, user_id, attributes = nil, event_tags = nil) ⇒ Object 



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# File 'lib/optimizely.rb', line 162

def track(event_key, user_id, attributes = nil, event_tags = nil)
  # Send conversion event to Optimizely.
  #
  # event_key - Event key representing the event which needs to be recorded.
  # user_id - String ID for user.
  # attributes - Hash representing visitor attributes and values which need to be recorded.
  # event_tags - Hash representing metadata associated with the event.

  unless @is_valid
    logger = SimpleLogger.new
    logger.log(Logger::ERROR, InvalidDatafileError.new('track').message)
    return nil
  end

  if event_tags and event_tags.is_a? Numeric
    event_tags = {
      'revenue' => event_tags
    }
    @logger.log(Logger::WARN, 'Event value is deprecated in track call. Use event tags to pass in revenue value instead.')
  end

  return nil unless user_inputs_valid?(attributes, event_tags)

  experiment_ids = @config.get_experiment_ids_for_event(event_key)
  if experiment_ids.empty?
    @config.logger.log(Logger::INFO, "Not tracking user '#{user_id}'.")
    return nil
  end

  # Filter out experiments that are not running or that do not include the user in audience conditions

  experiment_variation_map = get_valid_experiments_for_event(event_key, user_id, attributes)

  # Don't track events without valid experiments attached
  if experiment_variation_map.empty?
    @logger.log(Logger::INFO, "There are no valid experiments for event '#{event_key}' to track.")
    return nil
  end

  conversion_event = @event_builder.create_conversion_event(event_key, user_id, attributes,
                                                            event_tags, experiment_variation_map)
  @logger.log(Logger::INFO,
              'Dispatching conversion event to URL %s with params %s.' % [conversion_event.url,
                                                                          conversion_event.params])
  begin
    @event_dispatcher.dispatch_event(conversion_event)
  rescue => e
    @logger.log(Logger::ERROR, "Unable to dispatch conversion event. Error: #{e}")
  end
end