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41 lines
1.2 KiB
Python
41 lines
1.2 KiB
Python
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"""This file defines a basic download-to-memory consumer, suitable for use in
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a filenode's read() method. See download_to_data() for an example of its use.
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"""
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from zope.interface import implements
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from twisted.internet.interfaces import IConsumer
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class MemoryConsumer:
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implements(IConsumer)
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def __init__(self, progress=None):
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self.chunks = []
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self.done = False
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self._progress = progress
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def registerProducer(self, p, streaming):
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self.producer = p
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if streaming:
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# call resumeProducing once to start things off
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p.resumeProducing()
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else:
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while not self.done:
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p.resumeProducing()
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def write(self, data):
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self.chunks.append(data)
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if self._progress is not None:
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self._progress.set_progress(sum([len(c) for c in self.chunks]))
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def unregisterProducer(self):
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self.done = True
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def download_to_data(n, offset=0, size=None, progress=None):
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"""
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:param progress: None or an IProgress implementer
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"""
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d = n.read(MemoryConsumer(progress=progress), offset, size)
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d.addCallback(lambda mc: "".join(mc.chunks))
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return d
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