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require 'set'
require 'redis'
require 'flipper'
module Flipper
module Adapters
class Redis
include ::Flipper::Adapter
# Private: The key that stores the set of known features.
FeaturesKey = :flipper_features
# Public: The name of the adapter.
attr_reader :name
# Public: Initializes a Redis flipper adapter.
#
# client - The Redis client to use. Feel free to namespace it.
def initialize(client)
@client = client
@name = :redis
end
# Public: The set of known features.
def features
read_feature_keys
end
# Public: Adds a feature to the set of known features.
def add(feature)
@client.sadd FeaturesKey, feature.key
true
end
# Public: Removes a feature from the set of known features.
def remove(feature)
@client.multi do
@client.srem FeaturesKey, feature.key
@client.del feature.key
end
true
end
# Public: Clears the gate values for a feature.
def clear(feature)
@client.del feature.key
true
end
# Public: Gets the values for all gates for a given feature.
#
# Returns a Hash of Flipper::Gate#key => value.
def get(feature)
doc = doc_for(feature)
result_for_feature(feature, doc)
end
def get_multi(features)
read_many_features(features)
end
def get_all
features = read_feature_keys.map { |key| Flipper::Feature.new(key, self) }
read_many_features(features)
end
# Public: Enables a gate for a given thing.
#
# feature - The Flipper::Feature for the gate.
# gate - The Flipper::Gate to disable.
# thing - The Flipper::Type being enabled for the gate.
#
# Returns true.
def enable(feature, gate, thing)
case gate.data_type
when :boolean, :integer
@client.hset feature.key, gate.key, thing.value.to_s
when :set
@client.hset feature.key, to_field(gate, thing), 1
else
unsupported_data_type gate.data_type
end
true
end
# Public: Disables a gate for a given thing.
#
# feature - The Flipper::Feature for the gate.
# gate - The Flipper::Gate to disable.
# thing - The Flipper::Type being disabled for the gate.
#
# Returns true.
def disable(feature, gate, thing)
case gate.data_type
when :boolean
@client.del feature.key
when :integer
@client.hset feature.key, gate.key, thing.value.to_s
when :set
@client.hdel feature.key, to_field(gate, thing)
else
unsupported_data_type gate.data_type
end
true
end
private
def read_many_features(features)
docs = docs_for(features)
result = {}
features.zip(docs) do |feature, doc|
result[feature.key] = result_for_feature(feature, doc)
end
result
end
def read_feature_keys
@client.smembers(FeaturesKey).to_set
end
# Private: Gets a hash of fields => values for the given feature.
#
# Returns a Hash of fields => values.
def doc_for(feature)
@client.hgetall(feature.key)
end
def docs_for(features)
@client.pipelined do
features.each do |feature|
doc_for(feature)
end
end
end
def result_for_feature(feature, doc)
result = {}
fields = doc.keys
feature.gates.each do |gate|
result[gate.key] =
case gate.data_type
when :boolean, :integer
doc[gate.key.to_s]
when :set
fields_to_gate_value fields, gate
else
unsupported_data_type gate.data_type
end
end
result
end
# Private: Converts gate and thing to hash key.
def to_field(gate, thing)
"#{gate.key}/#{thing.value}"
end
# Private: Returns a set of values given an array of fields and a gate.
#
# Returns a Set of the values enabled for the gate.
def fields_to_gate_value(fields, gate)
regex = %r{^#{Regexp.escape(gate.key.to_s)}/}
keys = fields.grep(regex)
values = keys.map { |key| key.split('/', 2).last }
values.to_set
end
# Private
def unsupported_data_type(data_type)
raise "#{data_type} is not supported by this adapter"
end
end
end
end
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