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require 'pstore'
require 'set'
require 'flipper'
module Flipper
module Adapters
# Public: Adapter based on Ruby's pstore database. Perfect for when a local
# file is good enough for storing features.
class PStore
include ::Flipper::Adapter
FeaturesKey = :flipper_features
# Public: The name of the adapter.
attr_reader :name
# Public: The path to where the file is stored.
attr_reader :path
# Public: PStore's thread_safe option.
attr_reader :thread_safe
# Public
def initialize(path = 'flipper.pstore', thread_safe = false)
@path = path
@store = ::PStore.new(path, thread_safe)
@name = :pstore
end
# Public: The set of known features.
def features
@store.transaction do
read_feature_keys
end
end
# Public: Adds a feature to the set of known features.
def add(feature)
@store.transaction do
set_add FeaturesKey, feature.key
end
true
end
# Public: Removes a feature from the set of known features and clears
# all the values for the feature.
def remove(feature)
@store.transaction do
set_delete FeaturesKey, feature.key
clear_gates(feature)
end
true
end
# Public: Clears all the gate values for a feature.
def clear(feature)
@store.transaction do
clear_gates(feature)
end
true
end
# Public
def get(feature)
@store.transaction do
result_for_feature(feature)
end
end
def get_multi(features)
@store.transaction do
read_many_features(features)
end
end
def get_all
@store.transaction do
features = read_feature_keys.map { |key| Flipper::Feature.new(key, self) }
read_many_features(features)
end
end
# Public
def enable(feature, gate, thing)
@store.transaction do
case gate.data_type
when :boolean, :integer
write key(feature, gate), thing.value.to_s
when :set
set_add key(feature, gate), thing.value.to_s
else
raise "#{gate} is not supported by this adapter yet"
end
end
true
end
# Public
def disable(feature, gate, thing)
case gate.data_type
when :boolean
clear(feature)
when :integer
@store.transaction do
write key(feature, gate), thing.value.to_s
end
when :set
@store.transaction do
set_delete key(feature, gate), thing.value.to_s
end
else
raise "#{gate} is not supported by this adapter yet"
end
true
end
# Public
def inspect
attributes = [
"name=#{@name.inspect}",
"path=#{@path.inspect}",
"store=#{@store}",
]
"#<#{self.class.name}:#{object_id} #{attributes.join(', ')}>"
end
private
def clear_gates(feature)
feature.gates.each do |gate|
delete key(feature, gate)
end
end
def read_feature_keys
set_members FeaturesKey
end
def read_many_features(features)
result = {}
features.each do |feature|
result[feature.key] = result_for_feature(feature)
end
result
end
def result_for_feature(feature)
result = {}
feature.gates.each do |gate|
result[gate.key] =
case gate.data_type
when :boolean, :integer
read key(feature, gate)
when :set
set_members key(feature, gate)
else
raise "#{gate} is not supported by this adapter yet"
end
end
result
end
# Private
def key(feature, gate)
"#{feature.key}/#{gate.key}"
end
# Private
def read(key)
@store[key.to_s]
end
# Private
def write(key, value)
@store[key.to_s] = value.to_s
end
# Private
def delete(key)
@store.delete(key.to_s)
end
# Private
def set_add(key, value)
set_members(key) do |members|
members.add(value.to_s)
end
end
# Private
def set_delete(key, value)
set_members(key) do |members|
members.delete(value.to_s)
end
end
# Private
def set_members(key)
key = key.to_s
@store[key] ||= Set.new
if block_given?
yield @store[key]
else
@store[key]
end
end
end
end
end
|
