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require 'set'
require 'flipper'
require 'mongo'
module Flipper
module Adapters
class Mongo
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
def initialize(collection)
@collection = collection
@name = :mongo
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)
update FeaturesKey, '$addToSet' => { 'features' => feature.key }
true
end
# Public: Removes a feature from the set of known features.
def remove(feature)
update FeaturesKey, '$pull' => { 'features' => feature.key }
clear feature
true
end
# Public: Clears all the gate values for a feature.
def clear(feature)
delete 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 = find(feature.key)
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 disabled for the gate.
#
# Returns true.
def enable(feature, gate, thing)
case gate.data_type
when :boolean, :integer
update feature.key, '$set' => {
gate.key.to_s => thing.value.to_s,
}
when :set
update feature.key, '$addToSet' => {
gate.key.to_s => thing.value.to_s,
}
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
delete feature.key
when :integer
update feature.key, '$set' => { gate.key.to_s => thing.value.to_s }
when :set
update feature.key, '$pull' => { gate.key.to_s => thing.value.to_s }
else
unsupported_data_type gate.data_type
end
true
end
private
def read_feature_keys
find(FeaturesKey).fetch('features') { Set.new }.to_set
end
def read_many_features(features)
docs = find_many(features.map(&:key))
result = {}
features.each do |feature|
result[feature.key] = result_for_feature(feature, docs[feature.key])
end
result
end
# Private
def unsupported_data_type(data_type)
raise "#{data_type} is not supported by this adapter"
end
# Private
def find(key)
@collection.find(_id: key.to_s).limit(1).first || {}
end
def find_many(keys)
docs = @collection.find(_id: { '$in' => keys }).to_a
result = Hash.new { |hash, key| hash[key] = {} }
docs.each do |doc|
result[doc['_id']] = doc
end
result
end
# Private
def update(key, updates)
options = { upsert: true }
@collection.find(_id: key.to_s).update_one(updates, options)
end
# Private
def delete(key)
@collection.find(_id: key.to_s).delete_one
end
def result_for_feature(feature, doc)
result = {}
feature.gates.each do |gate|
result[gate.key] =
case gate.data_type
when :boolean, :integer
doc[gate.key.to_s]
when :set
doc.fetch(gate.key.to_s) { Set.new }.to_set
else
unsupported_data_type gate.data_type
end
end
result
end
end
end
end
|
