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require 'active_support/core_ext/file/path'
require 'rack/chunked'
module ActionController #:nodoc:
# Methods for sending streaming templates back to the client.
module Streaming
extend ActiveSupport::Concern
include AbstractController::Rendering
attr_internal :stream
module ClassMethods
# Render streaming templates. It accepts :only, :except, :if and :unless as options
# to specify when to stream, as in ActionController filters.
def stream(options={})
if defined?(Fiber)
before_filter :_stream_filter, options
else
raise "You cannot use streaming if Fiber is not available."
end
end
end
protected
# Mark following render calls as streaming.
def _stream_filter #:nodoc:
self.stream = true
end
# Consider the stream option when normalazing options.
def _normalize_options(options) #:nodoc:
super
options[:stream] = self.stream unless options.key?(:stream)
end
# Set proper cache control and transfer encoding when streaming
def _process_options(options) #:nodoc:
super
if options[:stream]
if env["HTTP_VERSION"] == "HTTP/1.0"
options.delete(:stream)
else
headers["Cache-Control"] ||= "no-cache"
headers["Transfer-Encoding"] = "chunked"
headers.delete("Content-Length")
end
end
end
# Call render_to_body if we are streaming instead of usual +render+.
def _render_template(options) #:nodoc:
if options.delete(:stream)
Rack::Chunked::Body.new view_context.render_body(options)
else
super
end
end
end
end
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