40 lines
1.3 KiB
Python
40 lines
1.3 KiB
Python
|
# 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.
|
||
|
#
|
||
|
|
||
|
|
||
|
class IterableChunkedFile:
|
||
|
"""File object chunk iterator using yield.
|
||
|
|
||
|
Represents a local file as an iterable object by splitting the file
|
||
|
into chunks. Avoids the file from being completely loaded into memory.
|
||
|
"""
|
||
|
|
||
|
def __init__(self, file_object, chunk_size=1024 * 1024 * 128, close=False):
|
||
|
self.close_after_read = close
|
||
|
self.file_object = file_object
|
||
|
self.chunk_size = chunk_size
|
||
|
|
||
|
def __iter__(self):
|
||
|
try:
|
||
|
while True:
|
||
|
data = self.file_object.read(self.chunk_size)
|
||
|
if not data:
|
||
|
break
|
||
|
yield data
|
||
|
finally:
|
||
|
if self.close_after_read:
|
||
|
self.file_object.close()
|
||
|
|
||
|
def __len__(self):
|
||
|
return len(self.file_object)
|