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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
NotFound = [404, {"Content-Type" => "text/plain"}, []]
attr_reader :apps
def initialize(apps, catch=[404, 405])
@apps = []; @has_app = {}
apps.each { |app| add app }
@catch = {}
[*catch].each { |status| @catch[status] = true }
end
def call(env)
result = NotFound
@apps.each do |app|
result = app.call(env)
break unless @catch.include?(result[0].to_i)
end
result
end
def add app
@has_app[app] = true
@apps << app
end
def include? app
@has_app.include? app
end
alias_method :<<, :add
end
end
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