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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
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
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