37 lines
828 B
Python
37 lines
828 B
Python
from multiprocessing import Queue
|
|
import os
|
|
|
|
class QueueFile(object):
|
|
""" Class which implements a file-like interface and reads from a blocking
|
|
multiprocessing queue.
|
|
"""
|
|
def __init__(self, queue, name=None):
|
|
self._queue = queue
|
|
self._closed = False
|
|
self._done = False
|
|
self._buffer = ''
|
|
self._total_size = 0
|
|
self._name = name
|
|
|
|
def read(self, size=8192):
|
|
if self._closed or self._done:
|
|
return None
|
|
|
|
while len(self._buffer) < size:
|
|
result = self._queue.get(block=True)
|
|
if result is None:
|
|
self._done = True
|
|
break
|
|
|
|
self._buffer += result
|
|
self._total_size += len(result)
|
|
|
|
buf = self._buffer[0:size]
|
|
self._buffer = self._buffer[size:]
|
|
return buf
|
|
|
|
def flush(self):
|
|
pass
|
|
|
|
def close(self):
|
|
self._closed = True
|