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pcp.py
# -*- test-case-name: twisted.test.test_pcp -*- # Copyright (c) Twisted Matrix Laboratories. # See LICENSE for details. """ Producer-Consumer Proxy. """ from zope.interface import implementer from twisted.internet import interfaces @implementer(interfaces.IProducer, interfaces.IConsumer) class BasicProducerConsumerProxy: """ I can act as a man in the middle between any Producer and Consumer. @ivar producer: the Producer I subscribe to. @type producer: L{IProducer<interfaces.IProducer>} @ivar consumer: the Consumer I publish to. @type consumer: L{IConsumer<interfaces.IConsumer>} @ivar paused: As a Producer, am I paused? @type paused: bool """ consumer = None producer = None producerIsStreaming = None iAmStreaming = True outstandingPull = False paused = False stopped = False def __init__(self, consumer): self._buffer = [] if consumer is not None: self.consumer = consumer consumer.registerProducer(self, self.iAmStreaming) # Producer methods: def pauseProducing(self): self.paused = True if self.producer: self.producer.pauseProducing() def resumeProducing(self): self.paused = False if self._buffer: # TODO: Check to see if consumer supports writeSeq. self.consumer.write("".join(self._buffer)) self._buffer[:] = [] else: if not self.iAmStreaming: self.outstandingPull = True if self.producer is not None: self.producer.resumeProducing() def stopProducing(self): if self.producer is not None: self.producer.stopProducing() if self.consumer is not None: del self.consumer # Consumer methods: def write(self, data): if self.paused or (not self.iAmStreaming and not self.outstandingPull): # We could use that fifo queue here. self._buffer.append(data) elif self.consumer is not None: self.consumer.write(data) self.outstandingPull = False def finish(self): if self.consumer is not None: self.consumer.finish() self.unregisterProducer() def registerProducer(self, producer, streaming): self.producer = producer self.producerIsStreaming = streaming def unregisterProducer(self): if self.producer is not None: del self.producer del self.producerIsStreaming if self.consumer: self.consumer.unregisterProducer() def __repr__(self) -> str: return f"<{self.__class__}@{id(self):x} around {self.consumer}>" class ProducerConsumerProxy(BasicProducerConsumerProxy): """ProducerConsumerProxy with a finite buffer. When my buffer fills up, I have my parent Producer pause until my buffer has room in it again. """ # Copies much from abstract.FileDescriptor bufferSize = 2**2**2**2 producerPaused = False unregistered = False def pauseProducing(self): # Does *not* call up to ProducerConsumerProxy to relay the pause # message through to my parent Producer. self.paused = True def resumeProducing(self): self.paused = False if self._buffer: data = "".join(self._buffer) bytesSent = self._writeSomeData(data) if bytesSent < len(data): unsent = data[bytesSent:] assert ( not self.iAmStreaming ), "Streaming producer did not write all its data." self._buffer[:] = [unsent] else: self._buffer[:] = [] else: bytesSent = 0 if ( self.unregistered and bytesSent and not self._buffer and self.consumer is not None ): self.consumer.unregisterProducer() if not self.iAmStreaming: self.outstandingPull = not bytesSent if self.producer is not None: bytesBuffered = sum(len(s) for s in self._buffer) # TODO: You can see here the potential for high and low # watermarks, where bufferSize would be the high mark when we # ask the upstream producer to pause, and we wouldn't have # it resume again until it hit the low mark. Or if producer # is Pull, maybe we'd like to pull from it as much as necessary # to keep our buffer full to the low mark, so we're never caught # without something to send. if self.producerPaused and (bytesBuffered < self.bufferSize): # Now that our buffer is empty, self.producerPaused = False self.producer.resumeProducing() elif self.outstandingPull: # I did not have any data to write in response to a pull, # so I'd better pull some myself. self.producer.resumeProducing() def write(self, data): if self.paused or (not self.iAmStreaming and not self.outstandingPull): # We could use that fifo queue here. self._buffer.append(data) elif self.consumer is not None: assert ( not self._buffer ), "Writing fresh data to consumer before my buffer is empty!" # I'm going to use _writeSomeData here so that there is only one # path to self.consumer.write. But it doesn't actually make sense, # if I am streaming, for some data to not be all data. But maybe I # am not streaming, but I am writing here anyway, because there was # an earlier request for data which was not answered. bytesSent = self._writeSomeData(data) self.outstandingPull = False if not bytesSent == len(data): assert ( not self.iAmStreaming ), "Streaming producer did not write all its data." self._buffer.append(data[bytesSent:]) if (self.producer is not None) and self.producerIsStreaming: bytesBuffered = sum(len(s) for s in self._buffer) if bytesBuffered >= self.bufferSize: self.producer.pauseProducing() self.producerPaused = True def registerProducer(self, producer, streaming): self.unregistered = False BasicProducerConsumerProxy.registerProducer(self, producer, streaming) if not streaming: producer.resumeProducing() def unregisterProducer(self): if self.producer is not None: del self.producer del self.producerIsStreaming self.unregistered = True if self.consumer and not self._buffer: self.consumer.unregisterProducer() def _writeSomeData(self, data): """Write as much of this data as possible. @returns: The number of bytes written. """ if self.consumer is None: return 0 self.consumer.write(data) return len(data)
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