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Make all fields private

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This commit is contained in:
Erik Johnston 2018-01-18 11:10:12 +00:00
parent dc519602ac
commit 2f18a2647b
1 changed files with 31 additions and 31 deletions
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62
synapse/util/file_consumer.py
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@ -35,24 +35,24 @@ class BackgroundFileConsumer(object):
_RESUME_ON_QUEUE_SIZE = 2 _RESUME_ON_QUEUE_SIZE = 2
def __init__(self, file_obj): def __init__(self, file_obj):
self.file_obj = file_obj self._file_obj = file_obj
# Producer we're registered with # Producer we're registered with
self.producer = None self._producer = None
# True if PushProducer, false if PullProducer # True if PushProducer, false if PullProducer
self.streaming = False self.streaming = False
# For PushProducers, indicates whether we've paused the producer and # For PushProducers, indicates whether we've paused the producer and
# need to call resumeProducing before we get more data. # need to call resumeProducing before we get more data.
self.paused_producer = False self._paused_producer = False
# Queue of slices of bytes to be written. When producer calls # Queue of slices of bytes to be written. When producer calls
# unregister a final None is sent. # unregister a final None is sent.
self.bytes_queue = Queue.Queue() self._bytes_queue = Queue.Queue()
# Deferred that is resolved when finished writing # Deferred that is resolved when finished writing
self.finished_deferred = None self._finished_deferred = None
# If the _writer thread throws an exception it gets stored here. # If the _writer thread throws an exception it gets stored here.
self._write_exception = None self._write_exception = None
@ -69,21 +69,21 @@ class BackgroundFileConsumer(object):
streaming (bool): True if push based producer, False if pull streaming (bool): True if push based producer, False if pull
based. based.
""" """
if self.producer: if self._producer:
raise Exception("registerProducer called twice") raise Exception("registerProducer called twice")
self.producer = producer self._producer = producer
self.streaming = streaming self.streaming = streaming
self.finished_deferred = threads.deferToThread(self._writer) self._finished_deferred = threads.deferToThread(self._writer)
if not streaming: if not streaming:
self.producer.resumeProducing() self._producer.resumeProducing()
def unregisterProducer(self): def unregisterProducer(self):
"""Part of IProducer interface """Part of IProducer interface
""" """
self.producer = None self._producer = None
if not self.finished_deferred.called: if not self._finished_deferred.called:
self.bytes_queue.put_nowait(None) self._bytes_queue.put_nowait(None)
def write(self, bytes): def write(self, bytes):
"""Part of IProducer interface """Part of IProducer interface
@ -91,65 +91,65 @@ class BackgroundFileConsumer(object):
if self._write_exception: if self._write_exception:
raise self._write_exception raise self._write_exception
if self.finished_deferred.called: if self._finished_deferred.called:
raise Exception("consumer has closed") raise Exception("consumer has closed")
self.bytes_queue.put_nowait(bytes) self._bytes_queue.put_nowait(bytes)
# If this is a PushProducer and the queue is getting behind # If this is a PushProducer and the queue is getting behind
# then we pause the producer. # then we pause the producer.
if self.streaming and self.bytes_queue.qsize() >= self._PAUSE_ON_QUEUE_SIZE: if self.streaming and self._bytes_queue.qsize() >= self._PAUSE_ON_QUEUE_SIZE:
self.paused_producer = True self._paused_producer = True
self.producer.pauseProducing() self._producer.pauseProducing()
def _writer(self): def _writer(self):
"""This is run in a background thread to write to the file. """This is run in a background thread to write to the file.
""" """
try: try:
while self.producer or not self.bytes_queue.empty(): while self._producer or not self._bytes_queue.empty():
# If we've paused the producer check if we should resume the # If we've paused the producer check if we should resume the
# producer. # producer.
if self.producer and self.paused_producer: if self._producer and self._paused_producer:
if self.bytes_queue.qsize() <= self._RESUME_ON_QUEUE_SIZE: if self._bytes_queue.qsize() <= self._RESUME_ON_QUEUE_SIZE:
reactor.callFromThread(self._resume_paused_producer) reactor.callFromThread(self._resume_paused_producer)
if self._notify_empty_deferred and self.bytes_queue.empty(): if self._notify_empty_deferred and self._bytes_queue.empty():
reactor.callFromThread(self._notify_empty) reactor.callFromThread(self._notify_empty)
bytes = self.bytes_queue.get() bytes = self._bytes_queue.get()
# If we get a None (or empty list) then that's a signal used # If we get a None (or empty list) then that's a signal used
# to indicate we should check if we should stop. # to indicate we should check if we should stop.
if bytes: if bytes:
self.file_obj.write(bytes) self._file_obj.write(bytes)
# If its a pull producer then we need to explicitly ask for # If its a pull producer then we need to explicitly ask for
# more stuff. # more stuff.
if not self.streaming and self.producer: if not self.streaming and self._producer:
reactor.callFromThread(self.producer.resumeProducing) reactor.callFromThread(self._producer.resumeProducing)
except Exception as e: except Exception as e:
self._write_exception = e self._write_exception = e
raise raise
finally: finally:
self.file_obj.close() self._file_obj.close()
def wait(self): def wait(self):
"""Returns a deferred that resolves when finished writing to file """Returns a deferred that resolves when finished writing to file
""" """
return make_deferred_yieldable(self.finished_deferred) return make_deferred_yieldable(self._finished_deferred)
def _resume_paused_producer(self): def _resume_paused_producer(self):
"""Gets called if we should resume producing after being paused """Gets called if we should resume producing after being paused
""" """
if self.paused_producer and self.producer: if self._paused_producer and self._producer:
self.paused_producer = False self._paused_producer = False
self.producer.resumeProducing() self._producer.resumeProducing()
def _notify_empty(self): def _notify_empty(self):
"""Called when the _writer thread thinks the queue may be empty and """Called when the _writer thread thinks the queue may be empty and
we should notify anything waiting on `wait_for_writes` we should notify anything waiting on `wait_for_writes`
""" """
if self._notify_empty_deferred and self.bytes_queue.empty(): if self._notify_empty_deferred and self._bytes_queue.empty():
d = self._notify_empty_deferred d = self._notify_empty_deferred
self._notify_empty_deferred = None self._notify_empty_deferred = None
d.callback(None) d.callback(None)