Class: Async::HTTP::Cache::Response

Inherits:
Protocol::HTTP::Response
  • Object
show all
Defined in:
lib/async/http/cache/response.rb

Constant Summary collapse

CACHE_CONTROL = 
'cache-control'

'set-cookie'
ETAG = 
'etag'
X_CACHE = 
'x-cache'

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(response, body) ⇒ Response

Returns a new instance of Response.



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# File 'lib/async/http/cache/response.rb', line 36

def initialize(response, body)
  @generated_at = Async::Clock.now
  
  super(
    response.version,
    response.status,
    response.headers.flatten,
    body,
    response.protocol
  )
  
  @max_age = @headers[CACHE_CONTROL]&.max_age
  @etag = nil
  
  @headers.set(X_CACHE, 'hit')
end

Instance Attribute Details

#generated_at ⇒ Object (readonly)

Returns the value of attribute generated_at.



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# File 'lib/async/http/cache/response.rb', line 53

def generated_at
  @generated_at
end

Instance Method Details

#age ⇒ Object 



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# File 'lib/async/http/cache/response.rb', line 77

def age
  Async::Clock.now - @generated_at
end

#cachable? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/async/http/cache/response.rb', line 59

def cachable?
  if cache_control = @headers[CACHE_CONTROL]
    if cache_control.private? || !cache_control.public?
      return false
    end
  else
    # No cache control header...
    return false
  end
  
  if set_cookie = @headers[SET_COOKIE]
    Async.logger.warn(self) {"Cannot cache response with set-cookie header!"}
    return false
  end
  
  return true
end

#dup ⇒ Object 



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# File 'lib/async/http/cache/response.rb', line 87

def dup
  dup = super
  
  dup.body = @body.dup
  dup.headers = @headers.dup
  
  return dup
end

#etag ⇒ Object 



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# File 'lib/async/http/cache/response.rb', line 55

def etag
  @etag ||= @headers[ETAG]
end

#expired? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/async/http/cache/response.rb', line 81

def expired?
  if @max_age
    self.age > @max_age
  end
end