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module Feature
module Repository
# YamlRepository for active and inactive features
# The yaml config file should look like this:
#
# features:
# an_active_feature: true
# an_inactive_feature: false
#
# Example usage:
# repository = YamlRepository.new('/path/to/yaml/file')
# # use repository with Feature
#
# A yaml config also can have this format:
# features:
# development:
# a_feature: true
# production:
# a_feature: false
#
# This way you have to use:
# repository = YamlRepository.new('/path/to/yaml/file', '_your_environment_')
# # use repository with Feature
#
class YamlRepository
require 'erb'
require 'yaml'
# Constructor
#
# @param [String] yaml_file_name the yaml config filename
# @param [String] environment optional environment to use from config
#
def initialize(yaml_file_name, environment = '')
@yaml_file_name = yaml_file_name
@environment = environment
end
# Returns list of active features
#
# @return [Array<Symbol>] list of active features
#
def active_features
data = read_file(@yaml_file_name)
get_active_features(data, @environment)
end
# Read given file, perform erb evaluation and yaml parsing
#
# @param file_name [String] the file name fo the yaml config
# @return [Hash]
#
def read_file(file_name)
raw_data = File.read(file_name)
evaluated_data = ERB.new(raw_data).result
YAML.load(evaluated_data)
end
private :read_file
# Extracts active features from given hash
#
# @param data [Hash] hash parsed from yaml file
# @param selector [String] uses the value for this key as source of feature data
#
def get_active_features(data, selector)
data = data[selector] unless selector.empty?
if !data.is_a?(Hash) || !data.key?('features')
raise ArgumentError, 'yaml config does not contain proper config'
end
return [] unless data['features']
check_valid_feature_data(data['features'])
data['features'].keys.select { |key| data['features'][key] }.map(&:to_sym)
end
private :get_active_features
# Checks for valid values in given feature hash
#
# @param features [Hash] feature hash
#
def check_valid_feature_data(features)
features.values.each do |value|
unless [true, false].include?(value)
raise ArgumentError, "#{value} is not allowed value in config, use true/false"
end
end
end
end
end
end
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