Class: Rack::ExpectationCascade

Inherits:
Object
  • Object
show all
Defined in:
lib/rack/contrib/expectation_cascade.rb

Constant Summary collapse

Expect = 
"Expect".freeze
ContinueExpectation = 
"100-continue".freeze
ExpectationFailed = 
[417, {"Content-Type" => "text/html"}, []].freeze
NotFound = 
[404, {"Content-Type" => "text/html"}, []].freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize {|_self| ... } ⇒ ExpectationCascade

Returns a new instance of ExpectationCascade.

Yields:

  • (_self)

Yield Parameters:



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# File 'lib/rack/contrib/expectation_cascade.rb', line 11

def initialize
  @apps = []
  yield self if block_given?
end

Instance Attribute Details

#apps ⇒ Object (readonly)

Returns the value of attribute apps.



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# File 'lib/rack/contrib/expectation_cascade.rb', line 9

def apps
  @apps
end

Instance Method Details

#<<(app) ⇒ Object 



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# File 'lib/rack/contrib/expectation_cascade.rb', line 28

def <<(app)
  @apps << app
end

#call(env) ⇒ Object 



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# File 'lib/rack/contrib/expectation_cascade.rb', line 16

def call(env)
  set_expectation = env[Expect] != ContinueExpectation
  env[Expect] = ContinueExpectation if set_expectation
  @apps.each do |app|
    result = app.call(env)
    return result unless result[0].to_i == 417
  end
  set_expectation ? NotFound : ExpectationFailed
ensure
  env.delete(Expect) if set_expectation
end