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 - 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]
# File lib/flipper/middleware/memoizer.rb, line 23 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 if opts[:preload_all] warn "Flipper::Middleware::Memoizer: `preload_all` is deprecated, use `preload: true`" opts[:preload] = true 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 38 def call(env) request = Rack::Request.new(env) if memoize?(request) memoized_call(env) else @app.call(env) end end
Private Instance Methods
memoize?(request)
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# File lib/flipper/middleware/memoizer.rb, line 50 def memoize?(request) if @opts[:if] @opts[:if].call(request) elsif @opts[:unless] !@opts[:unless].call(request) else true end end
memoized_call(env)
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# File lib/flipper/middleware/memoizer.rb, line 60 def memoized_call(env) reset_on_body_close = false flipper = env.fetch(@env_key) { Flipper } # Already memoizing. This instance does not need to do anything. if flipper.memoizing? warn "Flipper::Middleware::Memoizer appears to be running twice. Read how to resolve this at https://github.com/jnunemaker/flipper/pull/523" return @app.call(env) end flipper.memoize = true case @opts[:preload] when true then flipper.preload_all when Array then flipper.preload(@opts[:preload]) end response = @app.call(env) response[2] = Rack::BodyProxy.new(response[2]) do flipper.memoize = false end reset_on_body_close = true response ensure flipper.memoize = false if flipper && !reset_on_body_close end