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#!/usr/bin/env python
#
# Copyright 2015 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Small helper class to provide a small slice of a stream.
This class reads ahead to detect if we are at the end of the stream.
"""
from apitools.base.py import exceptions
# TODO(user): Consider replacing this with a StringIO.
class BufferedStream(object):
"""Buffers a stream, reading ahead to determine if we're at the end."""
def __init__(self, stream, start, size):
self.__stream = stream
self.__start_pos = start
self.__buffer_pos = 0
self.__buffered_data = self.__stream.read(size)
self.__stream_at_end = len(self.__buffered_data) < size
self.__end_pos = self.__start_pos + len(self.__buffered_data)
def __str__(self):
return ('Buffered stream %s from position %s-%s with %s '
'bytes remaining' % (self.__stream, self.__start_pos,
self.__end_pos, self._bytes_remaining))
def __len__(self):
return len(self.__buffered_data)
@property
def stream_exhausted(self):
return self.__stream_at_end
@property
def stream_end_position(self):
return self.__end_pos
@property
def _bytes_remaining(self):
return len(self.__buffered_data) - self.__buffer_pos
def read(self, size=None): # pylint: disable=invalid-name
"""Reads from the buffer."""
if size is None or size < 0:
raise exceptions.NotYetImplementedError(
'Illegal read of size %s requested on BufferedStream. '
'Wrapped stream %s is at position %s-%s, '
'%s bytes remaining.' %
(size, self.__stream, self.__start_pos, self.__end_pos,
self._bytes_remaining))
data = ''
if self._bytes_remaining:
size = min(size, self._bytes_remaining)
data = self.__buffered_data[
self.__buffer_pos:self.__buffer_pos + size]
self.__buffer_pos += size
return data