class Rack::PactBroker::Cascade

Constants

NotFound

deprecated, no longer used

Attributes

apps[R]

An array of applications to try in order.

Public Class Methods

new(apps, cascade_for = [404, 405]) click to toggle source

Set the apps to send requests to, and what statuses result in cascading. Arguments:

apps: An enumerable of rack applications. cascade_for: The statuses to use cascading for. If a response is received

from an app, the next app is tried.
# File lib/rack/pact_broker/cascade.rb, line 32
def initialize(apps, cascade_for = [404, 405])
  @apps = []
  apps.each { |app| add app }

  @cascade_for = {}
  [*cascade_for].each { |status| @cascade_for[status] = true }
end

Public Instance Methods

<<(app)
Alias for: add
add(app) click to toggle source

Append an app to the list of apps to cascade. This app will be tried last.

# File lib/rack/pact_broker/cascade.rb, line 75
def add(app)
  @apps << app
end
Also aliased as: <<
call(env) click to toggle source

Call each app in order. If the responses uses a status that requires cascading, try the next app. If all responses require cascading, return the response from the last app.

# File lib/rack/pact_broker/cascade.rb, line 43
def call(env)
  return [404, { CONTENT_TYPE => "text/plain" }, []] if @apps.empty?
  result = nil
  last_body = nil

  @apps.each_with_index do |app, i|
    # The SPEC says that the body must be closed after it has been iterated
    # by the server, or if it is replaced by a middleware action. Cascade
    # replaces the body each time a cascade happens. It is assumed that nil
    # does not respond to close, otherwise the previous application body
    # will be closed. The final application body will not be closed, as it
    # will be passed to the server as a result.
    last_body.close if last_body.respond_to? :close
    result = app.call(env)

    puts result.last

    # If it is a 404/403 AND the response body is empty, then try the next app
    if @cascade_for.include?(result[0].to_i) && result[2].respond_to?(:empty?) && result[2].empty?
      last_body = result[2]
    else
      puts "returned from #{i} of #{@apps.size}"
      # otherwise, return the result
      return result
    end
  end

  result
end
include?(app) click to toggle source

Whether the given app is one of the apps to cascade to.

# File lib/rack/pact_broker/cascade.rb, line 80
def include?(app)
  @apps.include?(app)
end