+++ /dev/null
-module Rack
- # Rack::Cascade tries an request on several apps, and returns the
- # first response that is not 404 (or in a list of configurable
- # status codes).
-
- class Cascade
- attr_reader :apps
-
- def initialize(apps, catch=404)
- @apps = apps
- @catch = [*catch]
- end
-
- def call(env)
- status = headers = body = nil
- raise ArgumentError, "empty cascade" if @apps.empty?
- @apps.each { |app|
- begin
- status, headers, body = app.call(env)
- break unless @catch.include?(status.to_i)
- end
- }
- [status, headers, body]
- end
-
- def add app
- @apps << app
- end
-
- def include? app
- @apps.include? app
- end
-
- alias_method :<<, :add
- end
-end