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# -*- coding: utf-8 -*-
# send_protocol.py
# Copyright (C) 2016 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from zope.interface import implements
from twisted.internet import defer
from twisted.internet import reactor
from twisted.web.iweb import IBodyProducer
from twisted.web.iweb import UNKNOWN_LENGTH
class DocStreamProducer(object):
"""
A producer that writes the body of a request to a consumer.
"""
implements(IBodyProducer)
def __init__(self, producer):
"""
Initialize the string produer.
:param producer: A RequestBody instance and a list of producer calls
:type producer: (.support.RequestBody, [(function, *args)])
"""
self.body, self.producer = producer
self.length = UNKNOWN_LENGTH
self.pause = False
self.stop = False
@defer.inlineCallbacks
def startProducing(self, consumer):
"""
Write the body to the consumer.
:param consumer: Any IConsumer provider.
:type consumer: twisted.internet.interfaces.IConsumer
:return: A Deferred that fires when production ends.
:rtype: twisted.internet.defer.Deferred
"""
while self.producer and not self.stop:
if self.pause:
yield self.sleep(0.001)
continue
call = self.producer.pop(0)
fun, args = call[0], call[1:]
yield fun(*args)
consumer.write(self.body.pop(1, leave_open=True))
consumer.write(self.body.pop(0)) # close stream
def sleep(self, secs):
d = defer.Deferred()
reactor.callLater(secs, d.callback, None)
return d
def pauseProducing(self):
self.pause = True
def stopProducing(self):
self.stop = True
def resumeProducing(self):
self.pause = False
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