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require 'action_dispatch/http/response'
require 'delegate'
module ActionController
module Live
class Response < ActionDispatch::Response
class Buffer < ActionDispatch::Response::Buffer # :nodoc:
def initialize(response)
super(response, Queue.new)
end
def write(string)
unless @response.committed?
@response.headers["Cache-Control"] = "no-cache"
@response.headers.delete("Content-Length")
end
super
end
def each
while str = @buf.pop
yield str
end
end
def close
super
@buf.push nil
end
end
class Header < DelegateClass(Hash)
def initialize(response, header)
@response = response
super(header)
end
def []=(k,v)
if @response.committed?
raise ActionDispatch::IllegalStateError, 'header already sent'
end
super
end
end
def initialize(status = 200, header = {}, body = [])
header = Header.new self, header
super(status, header, body)
end
private
def build_buffer(response, body)
buf = Buffer.new response
body.each { |part| buf.write part }
buf
end
end
def process(name)
t1 = Thread.current
locals = t1.keys.map { |key| [key, t1[key]] }
# This processes the action in a child thread. It lets us return the
# response code and headers back up the rack stack, and still process
# the body in parallel with sending data to the client
Thread.new {
t2 = Thread.current
t2.abort_on_exception = true
# Since we're processing the view in a different thread, copy the
# thread locals from the main thread to the child thread. :'(
locals.each { |k,v| t2[k] = v }
begin
super(name)
ensure
@_response.commit!
end
}
@_response.await_commit
end
end
end
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