Class: Flipper::Middleware::Memoizer

Inherits:
Object
  • Object
show all
Defined in:
lib/flipper/middleware/memoizer.rb

Instance Method Summary collapse

Constructor Details

#initialize(app, opts = {}) ⇒ Memoizer

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 - Boolean to preload all features or Array of Symbol feature names to preload.

Examples

use Flipper::Middleware::Memoizer

# using with preload_all features
use Flipper::Middleware::Memoizer, preload: true

# using with preload specific features
use Flipper::Middleware::Memoizer, preload: [:stats, :search, :some_feature]

# using with preload block that returns true/false
use Flipper::Middleware::Memoizer, preload: ->(request) { !request.path.start_with?('/assets') }

# using with preload block that returns specific features
use Flipper::Middleware::Memoizer, preload: ->(request) {
  request.path.starts_with?('/admin') ? [:stats, :search] : false
}


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# File 'lib/flipper/middleware/memoizer.rb', line 31

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.'
  end

  @app = app
  @opts = opts
  @env_key = opts.fetch(:env_key, 'flipper')
end

Instance Method Details

#call(env) ⇒ Object



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# File 'lib/flipper/middleware/memoizer.rb', line 41

def call(env)
  request = Rack::Request.new(env)

  if memoize?(request)
    memoized_call(request)
  else
    @app.call(env)
  end
end