Class: Magick::Feature

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

Constant Summary collapse

VALID_TYPES = 
i[boolean string number].freeze
VALID_STATUSES = 
i[active inactive deprecated].freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, adapter_registry, **options) ⇒ Feature

Returns a new instance of Feature.



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# File 'lib/magick/feature.rb', line 13

def initialize(name, adapter_registry, **options)
  @name = name.to_s
  @adapter_registry = adapter_registry
  @type = (options[:type] || :boolean).to_sym
  @status = (options[:status] || :active).to_sym
  @default_value = options.fetch(:default_value, default_for_type)
  @description = options[:description]
  @display_name = options[:name] || options[:display_name]
  @group = options[:group]
  @targeting = {}
  @dependencies = options[:dependencies] ? Array(options[:dependencies]) : []
  @stored_value_initialized = false # Track if @stored_value has been explicitly set

  # Performance optimizations: cache expensive checks
  @_targeting_empty = true # Will be updated after load_from_adapter
  @_rails_events_enabled = false # Cache Rails events availability (only enable in dev)
  @_perf_metrics_enabled = false # Cache performance metrics (disabled by default for speed)

  validate_type!
  validate_default_value!
  load_from_adapter
  # Update targeting empty cache after loading
  @_targeting_empty = @targeting.empty?
  # Cache performance metrics availability (check once, not on every call)
  # Only enable if performance_metrics exists AND is actually being used
  @_perf_metrics_enabled = !Magick.performance_metrics.nil?
  # Save description and display_name to adapter if they were provided and not already in adapter
  save_metadata_if_new
end

Instance Attribute Details

#adapter_registry ⇒ Object (readonly)

Returns the value of attribute adapter_registry.



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# File 'lib/magick/feature.rb', line 11

def adapter_registry
  @adapter_registry
end

#default_value ⇒ Object (readonly)

Returns the value of attribute default_value.



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# File 'lib/magick/feature.rb', line 11

def default_value
  @default_value
end

#description ⇒ Object (readonly)

Returns the value of attribute description.



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# File 'lib/magick/feature.rb', line 11

def description
  @description
end

#display_name ⇒ Object (readonly)

Returns the value of attribute display_name.



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# File 'lib/magick/feature.rb', line 11

def display_name
  @display_name
end

#group ⇒ Object (readonly)

Returns the value of attribute group.



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# File 'lib/magick/feature.rb', line 11

def group
  @group
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/magick/feature.rb', line 11

def name
  @name
end

#status ⇒ Object (readonly)

Returns the value of attribute status.



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# File 'lib/magick/feature.rb', line 11

def status
  @status
end

#type ⇒ Object (readonly)

Returns the value of attribute type.



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# File 'lib/magick/feature.rb', line 11

def type
  @type
end

Instance Method Details

#add_dependency(dependency_name) ⇒ Object 



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# File 'lib/magick/feature.rb', line 339

def add_dependency(dependency_name)
  @dependencies ||= []
  @dependencies << dependency_name.to_s unless @dependencies.include?(dependency_name.to_s)

  # Rails 8+ event
  if defined?(Magick::Rails::Events) && Magick::Rails::Events.rails8?
    Magick::Rails::Events.dependency_added(name, dependency_name)
  end

  true
end

#check_enabled(context = {}) ⇒ Object 



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# File 'lib/magick/feature.rb', line 91

def check_enabled(context = {})
  # Fast path: check status first
  return false if status == :inactive
  return false if status == :deprecated && !context[:allow_deprecated]

  # Fast path: skip targeting checks if targeting is empty (most common case)
  unless @_targeting_empty
    # Check date/time range targeting
    return false if targeting[:date_range] && !date_range_active?(targeting[:date_range])

    # Check IP address targeting
    return false if targeting[:ip_address] && context[:ip_address] && !ip_address_matches?(context[:ip_address])

    # Check custom attributes
    return false if targeting[:custom_attributes] && !custom_attributes_match?(context,
                                                                               targeting[:custom_attributes])

    # Check complex conditions
    return false if targeting[:complex_conditions] && !complex_conditions_match?(context,
                                                                                 targeting[:complex_conditions])

    # Check user/group/role/percentage targeting
    targeting_result = check_targeting(context)
    if targeting_result.nil?
      # Targeting doesn't match - return false
      return false
    else
      # Targeting matches - for boolean features, return true directly
      # For string/number features, still check the value
      if type == :boolean
        return true
      end
      # For string/number, continue to check value below
    end
  end

  # Get value and check based on type
  value = get_value(context)
  case type
  when :boolean
    value == true
  when :string
    !value.nil? && value != ''
  when :number
    value.to_f.positive?
  else
    false
  end
rescue StandardError => e
  # Return false on any error (fail-safe)
  warn "Magick: Error in check_enabled for '#{name}': #{e.message}" if defined?(Rails) && Rails.env.development?
  false
end

#delete ⇒ Object 



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# File 'lib/magick/feature.rb', line 539

def delete
  adapter_registry.delete(name)
  @stored_value = nil
  @stored_value_initialized = false # Reset initialization flag so get_value returns default_value
  @targeting = {}
  # Also remove from Magick.features if registered
  Magick.features.delete(name.to_s)
  true
end

#dependencies ⇒ Object 



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# File 'lib/magick/feature.rb', line 362

def dependencies
  @dependencies || []
end

#disable(user_id: nil) ⇒ Object 



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# File 'lib/magick/feature.rb', line 480

def disable(user_id: nil)
  # Clear all targeting to disable globally
  @targeting = {}
  save_targeting

  case type
  when :boolean
    set_value(false, user_id: user_id)
  when :string
    set_value('', user_id: user_id)
  when :number
    set_value(0, user_id: user_id)
  else
    raise InvalidFeatureValueError, "Cannot disable feature of type #{type}"
  end

  # Ensure registered feature instance also has targeting cleared
  if Magick.features.key?(name)
    registered = Magick.features[name]
    registered.instance_variable_set(:@targeting, {})
  end

  # Cascade disable: disable all features that depend on this one
  disable_dependent_features(user_id: user_id)

  # Rails 8+ event
  if defined?(Magick::Rails::Events) && Magick::Rails::Events.rails8?
    Magick::Rails::Events.feature_disabled_globally(name, user_id: user_id)
  end

  true
end

#disable_custom_attribute(attribute_name) ⇒ Object 



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# File 'lib/magick/feature.rb', line 314

def disable_custom_attribute(attribute_name)
  custom_attrs = targeting[:custom_attributes] || {}
  custom_attrs.delete(attribute_name.to_sym)
  if custom_attrs.empty?
    disable_targeting(:custom_attributes)
  else
    enable_targeting(:custom_attributes, custom_attrs)
  end
  true
end

#disable_date_range ⇒ Object 



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# File 'lib/magick/feature.rb', line 292

def disable_date_range
  disable_targeting(:date_range)
  true
end

#disable_for_group(group_name) ⇒ Object 



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# File 'lib/magick/feature.rb', line 232

def disable_for_group(group_name)
  disable_targeting(:group, group_name)
  true
end

#disable_for_role(role_name) ⇒ Object 



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# File 'lib/magick/feature.rb', line 242

def disable_for_role(role_name)
  disable_targeting(:role, role_name)
  true
end

#disable_for_user(user_id) ⇒ Object 



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# File 'lib/magick/feature.rb', line 222

def disable_for_user(user_id)
  disable_targeting(:user, user_id)
  true
end

#disable_ip_addresses ⇒ Object 



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# File 'lib/magick/feature.rb', line 302

def disable_ip_addresses
  disable_targeting(:ip_address)
  true
end

#disable_percentage_of_requests ⇒ Object 



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# File 'lib/magick/feature.rb', line 282

def disable_percentage_of_requests
  disable_targeting(:percentage_requests)
  true
end

#disable_percentage_of_users ⇒ Object 



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# File 'lib/magick/feature.rb', line 262

def disable_percentage_of_users
  disable_targeting(:percentage_users)
  true
end

#disabled?(context = {}) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/magick/feature.rb', line 145

def disabled?(context = {})
  !enabled?(context)
end

#disabled_for?(object, **additional_context) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/magick/feature.rb', line 157

def disabled_for?(object, **additional_context)
  !enabled_for?(object, **additional_context)
end

#enable(user_id: nil) ⇒ Object 



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# File 'lib/magick/feature.rb', line 440

def enable(user_id: nil)
  # Check if this feature is a dependency of any disabled features
  # If a main feature that depends on this feature is disabled, prevent enabling this dependency
  # Dependencies cannot be enabled until the main feature is enabled
  dependent_features = find_dependent_features
  disabled_dependents = dependent_features.select do |dep_feature_name|
    dep_feature = Magick.features[dep_feature_name.to_s] || Magick[dep_feature_name]
    # Check if the dependent feature (main feature) is disabled
    dep_feature && !dep_feature.enabled?
  end

  unless disabled_dependents.empty?
    # Return false if any main feature that depends on this feature is disabled
    # This prevents enabling a dependency when the main feature is disabled
    return false
  end

  # Clear all targeting to enable globally
  @targeting = {}
  save_targeting

  case type
  when :boolean
    set_value(true, user_id: user_id)
  when :string
    raise InvalidFeatureValueError, 'Cannot enable string feature. Use set_value instead.'
  when :number
    raise InvalidFeatureValueError, 'Cannot enable number feature. Use set_value instead.'
  else
    raise InvalidFeatureValueError, "Cannot enable feature of type #{type}"
  end

  # Rails 8+ event
  if defined?(Magick::Rails::Events) && Magick::Rails::Events.rails8?
    Magick::Rails::Events.feature_enabled_globally(name, user_id: user_id)
  end

  true
end

#enable_for_custom_attribute(attribute_name, values, operator: :equals) ⇒ Object 



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# File 'lib/magick/feature.rb', line 307

def enable_for_custom_attribute(attribute_name, values, operator: :equals)
  custom_attrs = targeting[:custom_attributes] || {}
  custom_attrs[attribute_name.to_sym] = { values: Array(values), operator: operator }
  enable_targeting(:custom_attributes, custom_attrs)
  true
end

#enable_for_date_range(start_date, end_date) ⇒ Object 



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# File 'lib/magick/feature.rb', line 287

def enable_for_date_range(start_date, end_date)
  enable_targeting(:date_range, { start: start_date, end: end_date })
  true
end

#enable_for_group(group_name) ⇒ Object 



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# File 'lib/magick/feature.rb', line 227

def enable_for_group(group_name)
  enable_targeting(:group, group_name)
  true
end

#enable_for_ip_addresses(ip_addresses) ⇒ Object 



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# File 'lib/magick/feature.rb', line 297

def enable_for_ip_addresses(ip_addresses)
  enable_targeting(:ip_address, Array(ip_addresses))
  true
end

#enable_for_role(role_name) ⇒ Object 



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# File 'lib/magick/feature.rb', line 237

def enable_for_role(role_name)
  enable_targeting(:role, role_name)
  true
end

#enable_for_user(user_id) ⇒ Object 



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# File 'lib/magick/feature.rb', line 217

def enable_for_user(user_id)
  enable_targeting(:user, user_id)
  true
end

#enable_percentage_of_requests(percentage) ⇒ Object 



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# File 'lib/magick/feature.rb', line 267

def enable_percentage_of_requests(percentage)
  @targeting[:percentage_requests] = percentage.to_f
  save_targeting

  # Update registered feature instance if it exists
  Magick.features[name].instance_variable_set(:@targeting, @targeting.dup) if Magick.features.key?(name)

  # Rails 8+ event
  if defined?(Magick::Rails::Events) && Magick::Rails::Events.rails8?
    Magick::Rails::Events.targeting_added(name, targeting_type: :percentage_requests, targeting_value: percentage)
  end

  true
end

#enable_percentage_of_users(percentage) ⇒ Object 



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# File 'lib/magick/feature.rb', line 247

def enable_percentage_of_users(percentage)
  @targeting[:percentage_users] = percentage.to_f
  save_targeting

  # Update registered feature instance if it exists
  Magick.features[name].instance_variable_set(:@targeting, @targeting.dup) if Magick.features.key?(name)

  # Rails 8+ event
  if defined?(Magick::Rails::Events) && Magick::Rails::Events.rails8?
    Magick::Rails::Events.targeting_added(name, targeting_type: :percentage_users, targeting_value: percentage)
  end

  true
end

#enabled?(context = {}) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/magick/feature.rb', line 43

def enabled?(context = {})
  # Check performance metrics dynamically (in case enabled after feature creation)
  # But cache the check result for performance
  perf_metrics = Magick.performance_metrics
  perf_metrics_enabled = !perf_metrics.nil?

  # Update cached flag if it changed
  @_perf_metrics_enabled = perf_metrics_enabled if @_perf_metrics_enabled != perf_metrics_enabled

  # Fast path: if performance metrics disabled, skip all overhead
  return check_enabled(context) unless perf_metrics_enabled

  # Performance metrics enabled: measure and record
  # Use inline timing to avoid function call overhead
  start_time = Process.clock_gettime(Process::CLOCK_MONOTONIC)
  result = check_enabled(context)
  duration = (Process.clock_gettime(Process::CLOCK_MONOTONIC) - start_time) * 1000 # milliseconds

  # Record metrics (fast path - minimal overhead)
  perf_metrics.record(name, 'enabled?', duration, success: true)

  # Rails 8+ events (only in development or when explicitly enabled)
  if @_rails_events_enabled
    if result
      Magick::Rails::Events.feature_enabled(name, context: context)
    else
      Magick::Rails::Events.feature_disabled(name, context: context)
    end
  end

  # Warn if deprecated (only if enabled)
  if status == :deprecated && result && !context[:allow_deprecated] && Magick.warn_on_deprecated
    warn "DEPRECATED: Feature '#{name}' is deprecated and will be removed."
    Magick::Rails::Events.deprecated_warning(name) if @_rails_events_enabled
  end

  result
rescue StandardError => e
  # Record error metrics if enabled
  if perf_metrics_enabled && perf_metrics
    duration = defined?(start_time) && start_time ? (Process.clock_gettime(Process::CLOCK_MONOTONIC) - start_time) * 1000 : 0.0
    perf_metrics.record(name, 'enabled?', duration, success: false)
  end
  # Return false on any error (fail-safe)
  warn "Magick: Error checking feature '#{name}': #{e.message}" if defined?(Rails) && Rails.env.development?
  false
end

#enabled_for?(object, **additional_context) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/magick/feature.rb', line 149

def enabled_for?(object, **additional_context)
  # Extract context from object
  context = extract_context_from_object(object)
  # Merge with any additional context provided
  context.merge!(additional_context)
  enabled?(context)
end

#get_value(context = {}) ⇒ Object 



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# File 'lib/magick/feature.rb', line 165

def get_value(context = {})
  # Fast path: check targeting rules first (only if targeting exists)
  unless @_targeting_empty
    targeting_result = check_targeting(context)
    # If targeting matches (returns truthy), return the stored value
    # If targeting doesn't match (returns nil), continue to return default value
    unless targeting_result.nil?
      # Targeting matches - return stored value (or load it if not initialized)
      if @stored_value_initialized
        return @stored_value
      else
        # Load from adapter
        loaded_value = load_value_from_adapter
        if loaded_value.nil?
          # Value not found in adapter, use default and cache it
          @stored_value = default_value
          @stored_value_initialized = true
          return default_value
        else
          # Value found in adapter, use it and mark as initialized
          @stored_value = loaded_value
          @stored_value_initialized = true
          return loaded_value
        end
      end
    end
    # Targeting doesn't match - return default value
    return default_value
  end

  # Fast path: use cached value if initialized (avoid adapter calls)
  return @stored_value if @stored_value_initialized

  # Load from adapter if instance variable hasn't been initialized
  loaded_value = load_value_from_adapter
  if loaded_value.nil?
    # Value not found in adapter, use default and cache it
    @stored_value = default_value
    @stored_value_initialized = true
    default_value
  else
    # Value found in adapter, use it and mark as initialized
    @stored_value = loaded_value
    @stored_value_initialized = true
    loaded_value
  end
rescue StandardError => e
  # Return default value on error (fail-safe)
  warn "Magick: Error in get_value for '#{name}': #{e.message}" if defined?(Rails) && Rails.env.development?
  default_value
end

#get_variant(context = {}) ⇒ Object 



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# File 'lib/magick/feature.rb', line 366

def get_variant(context = {})
  return nil unless targeting[:variants]

  variants = targeting[:variants]
  selected_variant = if variants.length == 1
                       variants.first[:name]
                     else
                       # Weighted random selection
                       total_weight = variants.sum { |v| v[:weight] || 0 }
                       if total_weight.zero?
                         variants.first[:name]
                       else
                         random = rand(total_weight)
                         current = 0
                         selected = nil
                         variants.each do |variant|
                           current += variant[:weight] || 0
                           if random < current
                             selected = variant[:name]
                             break
                           end
                         end
                         selected || variants.first[:name]
                       end
                     end

  # Rails 8+ event
  if defined?(Magick::Rails::Events) && Magick::Rails::Events.rails8?
    Magick::Rails::Events.variant_selected(name, variant_name: selected_variant, context: context)
  end

  selected_variant
end

#reload ⇒ Object

Reload feature state from adapter (useful when feature is changed externally)



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# File 'lib/magick/feature.rb', line 550

def reload
  load_from_adapter
  # Update targeting empty cache
  @_targeting_empty = @targeting.empty?
  # Update performance metrics flag (in case it was enabled after feature creation)
  @_perf_metrics_enabled = !Magick.performance_metrics.nil?
  # Update registered feature instance if it exists
  if Magick.features.key?(name)
    registered = Magick.features[name]
    registered.instance_variable_set(:@stored_value, @stored_value)
    registered.instance_variable_set(:@stored_value_initialized, @stored_value_initialized)
    registered.instance_variable_set(:@status, @status)
    registered.instance_variable_set(:@description, @description)
    registered.instance_variable_set(:@display_name, @display_name)
    registered.instance_variable_set(:@group, @group)
    registered.instance_variable_set(:@targeting, @targeting.dup)
    registered.instance_variable_set(:@_targeting_empty, @_targeting_empty)
    registered.instance_variable_set(:@_perf_metrics_enabled, @_perf_metrics_enabled)
  end
  true
end

#remove_dependency(dependency_name) ⇒ Object 



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# File 'lib/magick/feature.rb', line 351

def remove_dependency(dependency_name)
  @dependencies&.delete(dependency_name.to_s)

  # Rails 8+ event
  if defined?(Magick::Rails::Events) && Magick::Rails::Events.rails8?
    Magick::Rails::Events.dependency_removed(name, dependency_name)
  end

  true
end

#save_targeting ⇒ Object 



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# File 'lib/magick/feature.rb', line 585

def save_targeting
  # Save targeting to adapter (this updates memory synchronously, then Redis/AR)
  # The set method already publishes cache invalidation to other processes via Pub/Sub
  adapter_registry.set(name, 'targeting', targeting)

  # Update the feature in Magick.features if it's registered
  if Magick.features.key?(name)
    Magick.features[name].instance_variable_set(:@targeting, targeting.dup)
    # Update targeting empty cache for performance
    Magick.features[name].instance_variable_set(:@_targeting_empty, targeting.empty?)
  end

  # Update local targeting empty cache for performance
  @_targeting_empty = targeting.empty?

  # Note: We don't need to explicitly publish cache invalidation here because:
  # 1. adapter_registry.set already publishes cache invalidation (synchronously for async Redis updates)
  # 2. Publishing twice causes duplicate reloads in other processes
  # 3. The set method handles both sync and async Redis updates correctly
end

#set_group(group_name) ⇒ Object 



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# File 'lib/magick/feature.rb', line 521

def set_group(group_name)
  if group_name.nil? || group_name.to_s.strip.empty?
    @group = nil
    # Clear group from adapter by setting to empty string (adapters handle this)
    adapter_registry.set(name, 'group', nil)
  else
    @group = group_name.to_s.strip
    adapter_registry.set(name, 'group', @group)
  end

  # Update registered feature instance if it exists
  if Magick.features.key?(name)
    Magick.features[name].instance_variable_set(:@group, @group)
  end

  true
end

#set_status(new_status) ⇒ Object

Raises:



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# File 'lib/magick/feature.rb', line 513

def set_status(new_status)
  raise InvalidFeatureValueError, "Invalid status: #{new_status}" unless VALID_STATUSES.include?(new_status.to_sym)

  @status = new_status.to_sym
  adapter_registry.set(name, 'status', status)
  true
end

#set_value(value, user_id: nil) ⇒ Object 



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# File 'lib/magick/feature.rb', line 400

def set_value(value, user_id: nil)
  old_value = @stored_value
  validate_value!(value)
  adapter_registry.set(name, 'value', value)
  adapter_registry.set(name, 'type', type)
  adapter_registry.set(name, 'status', status)
  adapter_registry.set(name, 'default_value', default_value)
  adapter_registry.set(name, 'description', description) if description
  adapter_registry.set(name, 'display_name', display_name) if display_name
  adapter_registry.set(name, 'group', group) if group
  @stored_value = value
  @stored_value_initialized = true # Mark as initialized

  # Update registered feature instance if it exists
  if Magick.features.key?(name)
    registered = Magick.features[name]
    registered.instance_variable_set(:@stored_value, value)
    registered.instance_variable_set(:@stored_value_initialized, true)
    registered.instance_variable_set(:@targeting, @targeting.dup) if @targeting
  end

  changes = { value: { from: old_value, to: value } }

  # Audit log
  Magick.audit_log&.log(
    name,
    'set_value',
    user_id: user_id,
    changes: changes
  )

  # Rails 8+ events
  if defined?(Magick::Rails::Events) && Magick::Rails::Events.rails8?
    Magick::Rails::Events.feature_changed(name, changes: changes, user_id: user_id)
    Magick::Rails::Events.audit_logged(name, action: 'set_value', user_id: user_id, changes: changes)
  end

  true
end

#set_variants(variants) ⇒ Object 



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# File 'lib/magick/feature.rb', line 325

def set_variants(variants)
  variants_array = Array(variants).map do |v|
    v.is_a?(FeatureVariant) ? v : FeatureVariant.new(v[:name], v[:value], weight: v[:weight] || 0)
  end
  enable_targeting(:variants, variants_array.map(&:to_h))

  # Rails 8+ event
  if defined?(Magick::Rails::Events) && Magick::Rails::Events.rails8?
    Magick::Rails::Events.variant_set(name, variants: variants_array)
  end

  true
end

#to_h ⇒ Object 



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# File 'lib/magick/feature.rb', line 572

def to_h
  {
    name: name,
    display_name: display_name,
    type: type,
    status: status,
    value: stored_value,
    default_value: default_value,
    description: description,
    targeting: targeting
  }
end

#value(context = {}) ⇒ Object 



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# File 'lib/magick/feature.rb', line 161

def value(context = {})
  get_value(context)
end