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module Feature
module Repository
# RedisRepository for active feature list
#
# Example usage:
# repository = RedisRepository.new("feature_toggles")
# repository.add_active_feature(:feature_name)
#
# 'feature_toggles' can be whatever name you want to use for
# the Redis hash that will store all of your feature toggles.
#
class RedisRepository
attr_writer :redis
# Constructor
#
# @param redis_key the key of the redis hash where all the toggles will be stored
#
def initialize(redis_key, client = nil)
@redis_key = redis_key
@redis = client unless client.nil?
end
# Returns list of active features
#
# @return [Array<Symbol>] list of active features
#
def active_features
redis.hgetall(@redis_key).select { |_k, v| v.to_s == 'true' }.map { |k, _v| k.to_sym }
end
# Add an active feature to repository
#
# @param [Symbol] feature the feature to be added
#
def add_active_feature(feature)
check_feature_is_not_symbol(feature)
check_feature_already_in_list(feature)
redis.hset(@redis_key, feature, true)
end
# Checks that given feature is a symbol, raises exception otherwise
#
# @param [Sybmol] feature the feature to be checked
#
def check_feature_is_not_symbol(feature)
raise ArgumentError, "#{feature} is not a symbol" unless feature.instance_of?(Symbol)
end
private :check_feature_is_not_symbol
# Checks if given feature is already added to list of active features
# and raises an exception if so
#
# @param [Symbol] feature the feature to be checked
#
def check_feature_already_in_list(feature)
raise ArgumentError, "feature :#{feature} already added" if redis.hexists(@redis_key, feature)
end
private :check_feature_already_in_list
# Returns the currently specified redis client
#
# @return [Redis] Currently set redis client
#
def redis
@redis ||= Redis.current
end
private :redis
end
end
end
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