Class: Statsig::Evaluator

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(store, options, persistent_storage_utils) ⇒ Evaluator

Returns a new instance of Evaluator.



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# File 'lib/evaluator.rb', line 27

def initialize(store, options, persistent_storage_utils)
  UAParser.initialize_async
  CountryLookup.initialize_async

  @spec_store = store
  @gate_overrides = {}
  @config_overrides = {}
  @options = options
  @persistent_storage_utils = persistent_storage_utils
end

Instance Attribute Details

#config_overrides ⇒ Object

Returns the value of attribute config_overrides.



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# File 'lib/evaluator.rb', line 21

def config_overrides
  @config_overrides
end

#gate_overrides ⇒ Object

Returns the value of attribute gate_overrides.



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# File 'lib/evaluator.rb', line 19

def gate_overrides
  @gate_overrides
end

#options ⇒ Object

Returns the value of attribute options.



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# File 'lib/evaluator.rb', line 23

def options
  @options
end

#persistent_storage_utils ⇒ Object

Returns the value of attribute persistent_storage_utils.



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# File 'lib/evaluator.rb', line 25

def persistent_storage_utils
  @persistent_storage_utils
end

#spec_store ⇒ Object

Returns the value of attribute spec_store.



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

def spec_store
  @spec_store
end

Instance Method Details

#check_gate(user, gate_name, end_result, ignore_local_overrides: false, is_nested: false) ⇒ Object 



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# File 'lib/evaluator.rb', line 76

def check_gate(user, gate_name, end_result, ignore_local_overrides: false, is_nested: false)
  unless ignore_local_overrides
    local_override = lookup_gate_override(gate_name)
    unless local_override.nil?
      end_result.gate_value = local_override.gate_value
      end_result.rule_id = local_override.rule_id
      unless end_result.disable_evaluation_details
        end_result.evaluation_details = local_override.evaluation_details
      end
      return
    end
  end

  if @spec_store.init_reason == EvaluationReason::UNINITIALIZED
    unless end_result.disable_evaluation_details
      end_result.evaluation_details = EvaluationDetails.uninitialized
    end
    return
  end

  unless @spec_store.has_gate?(gate_name)
    unsupported_or_unrecognized(gate_name, end_result)
    return
  end

  eval_spec(gate_name, user, @spec_store.get_gate(gate_name), end_result, is_nested: is_nested)
end

#clear_config_overrides ⇒ Object 



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# File 'lib/evaluator.rb', line 299

def clear_config_overrides
  @config_overrides.clear
end

#clear_gate_overrides ⇒ Object 



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# File 'lib/evaluator.rb', line 287

def clear_gate_overrides
  @gate_overrides.clear
end

#eval_spec(config_name, user, config, end_result, is_nested: false) ⇒ Object 



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# File 'lib/evaluator.rb', line 303

def eval_spec(config_name, user, config, end_result, is_nested: false)
  config[:rules].each do |rule|
    eval_rule(user, rule, end_result)

    if end_result.gate_value
      if eval_delegate(config_name, user, rule, end_result)
        finalize_secondary_exposures(end_result)
        return
      end

      pass = eval_pass_percent(user, rule, config[:salt])
      finalize_eval_result(config, end_result, did_pass: pass, rule: rule, is_nested: is_nested)
      return
    end
  end

  finalize_eval_result(config, end_result, did_pass: false, rule: nil, is_nested: is_nested)
end

#get_client_initialize_response(user, hash_algo, client_sdk_key, include_local_overrides) ⇒ Object 



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# File 'lib/evaluator.rb', line 219

def get_client_initialize_response(user, hash_algo, client_sdk_key, include_local_overrides)
  if @spec_store.is_ready_for_checks == false
    return nil
  end
  if @spec_store.last_config_sync_time == 0
    return nil
  end

  evaluated_keys = {}
  if user.user_id.nil? == false
    evaluated_keys[:userID] = user.user_id
  end

  if user.custom_ids.nil? == false
    evaluated_keys[:customIDs] = user.custom_ids
  end
  meta = Statsig.get_statsig_metadata
  {
    feature_gates: Statsig::ResponseFormatter
                     .get_responses(@spec_store.gates, self, user, client_sdk_key, hash_algo, include_local_overrides: include_local_overrides),
    dynamic_configs: Statsig::ResponseFormatter
                       .get_responses(@spec_store.configs, self, user, client_sdk_key, hash_algo, include_local_overrides: include_local_overrides),
    layer_configs: Statsig::ResponseFormatter
                     .get_responses(@spec_store.layers, self, user, client_sdk_key, hash_algo, include_local_overrides: include_local_overrides),
    sdkParams: {},
    has_updates: true,
    generator: Const::STATSIG_RUBY_SDK,
    evaluated_keys: evaluated_keys,
    time: @spec_store.last_config_sync_time,
    hash_used: hash_algo,
    user: user.serialize(true),
    sdkInfo: {sdkType: meta["sdkType"], sdkVersion: meta["sdkVersion"]},
  }
end

#get_config(user, config_name, end_result, user_persisted_values: nil, ignore_local_overrides: false) ⇒ Object 



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# File 'lib/evaluator.rb', line 104

def get_config(user, config_name, end_result, user_persisted_values: nil, ignore_local_overrides: false)
  unless ignore_local_overrides
    local_override = lookup_config_override(config_name)
    unless local_override.nil?
      end_result.id_type = local_override.id_type
      end_result.rule_id = local_override.rule_id
      end_result.json_value = local_override.json_value
      unless end_result.disable_evaluation_details
        end_result.evaluation_details = local_override.evaluation_details
      end
      return
    end
  end

  if @spec_store.init_reason == EvaluationReason::UNINITIALIZED
    unless end_result.disable_evaluation_details
      end_result.evaluation_details = EvaluationDetails.uninitialized
    end
    return
  end

  unless @spec_store.has_config?(config_name)
    unsupported_or_unrecognized(config_name, end_result)
    return
  end

  config = @spec_store.get_config(config_name)

  # If persisted values is provided and the experiment is active, return sticky values if exists.
  if !user_persisted_values.nil? && config[:isActive] == true
    sticky_values = user_persisted_values[config_name]
    unless sticky_values.nil?
      end_result.gate_value = sticky_values[Statsig::Const::GATE_VALUE]
      end_result.json_value = sticky_values[Statsig::Const::JSON_VALUE]
      end_result.rule_id = sticky_values[Statsig::Const::RULE_ID]
      end_result.secondary_exposures = sticky_values[Statsig::Const::SECONDARY_EXPOSURES]
      end_result.group_name = sticky_values[Statsig::Const::GROUP_NAME]
      end_result.id_type = sticky_values[Statsig::Const::ID_TYPE]
      end_result.target_app_ids = sticky_values[Statsig::Const::TARGET_APP_IDS]
      unless end_result.disable_evaluation_details
        end_result.evaluation_details = EvaluationDetails.persisted(
          sticky_values[Statsig::Const::CONFIG_SYNC_TIME],
          sticky_values[Statsig::Const::INIT_TIME]
        )
      end
      return
    end

    # If it doesn't exist, then save to persisted storage if the user was assigned to an experiment group.
    eval_spec(config_name, user, config, end_result)
    if end_result.is_experiment_group
      @persistent_storage_utils.add_evaluation_to_user_persisted_values(user_persisted_values, config_name,
                                                                        end_result)
      @persistent_storage_utils.save_to_storage(user, config[:idType], user_persisted_values)
    end
    # Otherwise, remove from persisted storage
  else
    @persistent_storage_utils.remove_experiment_from_storage(user, config[:idType], config_name)
    eval_spec(config_name, user, config, end_result)
  end
end

#get_layer(user, layer_name, end_result) ⇒ Object 



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# File 'lib/evaluator.rb', line 166

def get_layer(user, layer_name, end_result)
  if @spec_store.init_reason == EvaluationReason::UNINITIALIZED
    unless end_result.disable_evaluation_details
      end_result.evaluation_details = EvaluationDetails.uninitialized
    end
    return
  end

  unless @spec_store.has_layer?(layer_name)
    unsupported_or_unrecognized(layer_name, end_result)
    return
  end

  eval_spec(layer_name, user, @spec_store.get_layer(layer_name), end_result)
end

#list_autotunes ⇒ Object 



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# File 'lib/evaluator.rb', line 206

def list_autotunes
keys = []
@spec_store.configs.each do |key, value|
  if value[:entity] == Const::TYPE_AUTOTUNE
    keys << key.to_s
  end
end
keys    end

#list_configs ⇒ Object 



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# File 'lib/evaluator.rb', line 186

def list_configs
  keys = []
  @spec_store.configs.each do |key, value|
    if value[:entity] == Const::TYPE_DYNAMIC_CONFIG
      keys << key.to_s
    end
  end
  keys
end

#list_experiments ⇒ Object 



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# File 'lib/evaluator.rb', line 196

def list_experiments
  keys = []
  @spec_store.configs.each do |key, value|
    if value[:entity] == Const::TYPE_EXPERIMENT
      keys << key.to_s
    end
  end
  keys
end

#list_gates ⇒ Object 



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# File 'lib/evaluator.rb', line 182

def list_gates
  @spec_store.gates.keys.map(&:to_s)
end

#list_layers ⇒ Object 



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# File 'lib/evaluator.rb', line 215

def list_layers
  @spec_store.layers.keys.map(&:to_s)
end

#lookup_config_override(config_name) ⇒ Object 



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# File 'lib/evaluator.rb', line 59

def lookup_config_override(config_name)
  config_name_sym = config_name.to_sym
  if @config_overrides.key?(config_name_sym)
    return ConfigResult.new(
      name: config_name,
      json_value: @config_overrides[config_name_sym],
      rule_id: Const::OVERRIDE,
      id_type: @spec_store.has_config?(config_name) ? @spec_store.get_config(config_name)[:idType] : Const::EMPTY_STR,
      evaluation_details: EvaluationDetails.local_override(
        @spec_store.last_config_sync_time,
        @spec_store.initial_config_sync_time
      )
    )
  end
  return nil
end

#lookup_gate_override(gate_name) ⇒ Object 



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# File 'lib/evaluator.rb', line 42

def lookup_gate_override(gate_name)
  gate_name_sym = gate_name.to_sym
  if @gate_overrides.key?(gate_name_sym)
    return ConfigResult.new(
      name: gate_name,
      gate_value: @gate_overrides[gate_name_sym],
      rule_id: Const::OVERRIDE,
      id_type: @spec_store.has_gate?(gate_name) ? @spec_store.get_gate(gate_name)[:idType] : Const::EMPTY_STR,
      evaluation_details: EvaluationDetails.local_override(
        @spec_store.last_config_sync_time,
        @spec_store.initial_config_sync_time
      )
    )
  end
  return nil
end

#maybe_restart_background_threads ⇒ Object 



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

def maybe_restart_background_threads
  @spec_store.maybe_restart_background_threads
end

#override_config(config, value) ⇒ Object 



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# File 'lib/evaluator.rb', line 291

def override_config(config, value)
  @config_overrides[config.to_sym] = value
end

#override_gate(gate, value) ⇒ Object 



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# File 'lib/evaluator.rb', line 279

def override_gate(gate, value)
  @gate_overrides[gate.to_sym] = value
end

#remove_config_override(config) ⇒ Object 



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# File 'lib/evaluator.rb', line 295

def remove_config_override(config)
  @config_overrides.delete(config.to_sym)
end

#remove_gate_override(gate) ⇒ Object 



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# File 'lib/evaluator.rb', line 283

def remove_gate_override(gate)
  @gate_overrides.delete(gate.to_sym)
end

#shutdown ⇒ Object 



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# File 'lib/evaluator.rb', line 254

def shutdown
  @spec_store.shutdown
end

#unsupported_or_unrecognized(config_name, end_result) ⇒ Object 



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# File 'lib/evaluator.rb', line 258

def unsupported_or_unrecognized(config_name, end_result)
  end_result.rule_id = Const::EMPTY_STR

  if end_result.disable_evaluation_details
    return
  end

  if @spec_store.unsupported_configs.include?(config_name)
    end_result.evaluation_details = EvaluationDetails.unsupported(
      @spec_store.last_config_sync_time,
      @spec_store.initial_config_sync_time
    )
    return
  end

  end_result.evaluation_details = EvaluationDetails.unrecognized(
    @spec_store.last_config_sync_time,
    @spec_store.initial_config_sync_time
  )
end