class Flipper::Middleware::Memoizer
Public Class Methods
new(app, opts = {})
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Public: Initializes an instance of the Memoizer middleware. Flipper must be configured with a default instance or the flipper instance must be setup in the env of the request. You can do this by using the Flipper::Middleware::SetupEnv middleware.
app - The app this middleware is included in. opts - The Hash of options.
:preload_all - Boolean of whether or not to preload all features. :preload - Array of Symbol feature names to preload.
Examples
use Flipper::Middleware::Memoizer # using with preload_all features use Flipper::Middleware::Memoizer, preload_all: true # using with preload specific features use Flipper::Middleware::Memoizer, preload: [:stats, :search, :some_feature]
# File lib/flipper/middleware/memoizer.rb, line 26 def initialize(app, opts = {}) if opts.is_a?(Flipper::DSL) || opts.is_a?(Proc) raise 'Flipper::Middleware::Memoizer no longer initializes with a flipper instance or block. Read more at: https://git.io/vSo31.' # rubocop:disable LineLength end @app = app @opts = opts @env_key = opts.fetch(:env_key, 'flipper') end
Public Instance Methods
call(env)
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# File lib/flipper/middleware/memoizer.rb, line 36 def call(env) request = Rack::Request.new(env) if skip_memoize?(request) @app.call(env) else memoized_call(env) end end
Private Instance Methods
memoized_call(env)
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# File lib/flipper/middleware/memoizer.rb, line 52 def memoized_call(env) reset_on_body_close = false flipper = env.fetch(@env_key) { Flipper } original = flipper.memoizing? flipper.memoize = true flipper.preload_all if @opts[:preload_all] if (preload = @opts[:preload]) flipper.preload(preload) end response = @app.call(env) response[2] = Rack::BodyProxy.new(response[2]) do flipper.memoize = original end reset_on_body_close = true response ensure flipper.memoize = original if flipper && !reset_on_body_close end
skip_memoize?(request)
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# File lib/flipper/middleware/memoizer.rb, line 48 def skip_memoize?(request) @opts[:unless] && @opts[:unless].call(request) end