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#-------------------------------------------------------------------------
# Copyright (c) Microsoft. All rights reserved.
#
# 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.
#--------------------------------------------------------------------------
import threading
from time import sleep
from .._error import _ERROR_NO_SINGLE_THREAD_CHUNKING
class _FileChunkDownloader(object):
def __init__(self, file_service, share_name, directory_name, file_name,
file_size, chunk_size, start_range, end_range, stream,
max_retries, retry_wait, progress_callback, timeout):
self.file_service = file_service
self.share_name = share_name
self.directory_name = directory_name
self.file_name = file_name
self.chunk_size = chunk_size
if start_range is not None:
end_range = end_range or file_size
self.file_size = end_range - start_range
self.file_end = end_range
self.start_index = start_range
else:
self.file_size = file_size
self.file_end = file_size
self.start_index = 0
self.stream = stream
self.stream_start = stream.tell()
self.stream_lock = threading.Lock()
self.progress_callback = progress_callback
self.progress_total = 0
self.progress_lock = threading.Lock()
self.max_retries = max_retries
self.retry_wait = retry_wait
self.timeout = timeout
def get_chunk_offsets(self):
index = self.start_index
while index < self.file_end:
yield index
index += self.chunk_size
def process_chunk(self, chunk_start):
if chunk_start + self.chunk_size > self.file_end:
chunk_end = self.file_end
else:
chunk_end = chunk_start + self.chunk_size
chunk_data = self._download_chunk_with_retries(chunk_start, chunk_end).content
length = chunk_end - chunk_start
if length > 0:
self._write_to_stream(chunk_data, chunk_start)
self._update_progress(length)
def _update_progress(self, length):
if self.progress_callback is not None:
with self.progress_lock:
self.progress_total += length
total = self.progress_total
self.progress_callback(total, self.file_size)
def _write_to_stream(self, chunk_data, chunk_start):
with self.stream_lock:
self.stream.seek(self.stream_start + chunk_start)
self.stream.write(chunk_data)
def _download_chunk_with_retries(self, chunk_start, chunk_end):
retries = self.max_retries
while True:
try:
return self.file_service._get_file(
self.share_name,
self.directory_name,
self.file_name,
start_range=chunk_start,
end_range=chunk_end - 1,
timeout=self.timeout
)
except Exception:
if retries > 0:
retries -= 1
sleep(self.retry_wait)
else:
raise
class _FileChunkUploader(object):
def __init__(self, file_service, share_name, directory_name, file_name,
file_size, chunk_size, stream, parallel, max_retries, retry_wait,
progress_callback, timeout):
self.file_service = file_service
self.share_name = share_name
self.directory_name = directory_name
self.file_name = file_name
self.file_size = file_size
self.chunk_size = chunk_size
self.stream = stream
self.stream_start = stream.tell() if parallel else None
self.stream_lock = threading.Lock() if parallel else None
self.progress_callback = progress_callback
self.progress_total = 0
self.progress_lock = threading.Lock() if parallel else None
self.max_retries = max_retries
self.retry_wait = retry_wait
self.timeout = timeout
def get_chunk_offsets(self):
index = 0
if self.file_size is None:
# we don't know the size of the stream, so we have no
# choice but to seek
while True:
data = self._read_from_stream(index, 1)
if not data:
break
yield index
index += self.chunk_size
else:
while index < self.file_size:
yield index
index += self.chunk_size
def process_chunk(self, chunk_offset):
size = self.chunk_size
if self.file_size is not None:
size = min(size, self.file_size - chunk_offset)
chunk_data = self._read_from_stream(chunk_offset, size)
return self._upload_chunk_with_retries(chunk_offset, chunk_data)
def process_all_unknown_size(self):
assert self.stream_lock is None
range_ids = []
index = 0
while True:
data = self._read_from_stream(None, self.chunk_size)
if data:
index += len(data)
range_id = self._upload_chunk_with_retries(index, data)
range_ids.append(range_id)
else:
break
return range_ids
def _read_from_stream(self, offset, count):
if self.stream_lock is not None:
with self.stream_lock:
self.stream.seek(self.stream_start + offset)
data = self.stream.read(count)
else:
data = self.stream.read(count)
return data
def _update_progress(self, length):
if self.progress_callback is not None:
if self.progress_lock is not None:
with self.progress_lock:
self.progress_total += length
total = self.progress_total
else:
self.progress_total += length
total = self.progress_total
self.progress_callback(total, self.file_size)
def _upload_chunk_with_retries(self, chunk_start, chunk_data):
retries = self.max_retries
while True:
try:
range_id = self._upload_chunk(chunk_start, chunk_data)
self._update_progress(len(chunk_data))
return range_id
except Exception:
if retries > 0:
retries -= 1
sleep(self.retry_wait)
else:
raise
def _upload_chunk(self, chunk_start, chunk_data):
chunk_end = chunk_start + len(chunk_data) - 1
self.file_service.update_range(
self.share_name,
self.directory_name,
self.file_name,
chunk_data,
chunk_start,
chunk_end,
timeout=self.timeout
)
return 'bytes={0}-{1}'.format(chunk_start, chunk_end)
def _download_file_chunks(file_service, share_name, directory_name, file_name,
file_size, block_size, start_range, end_range, stream,
max_connections, max_retries, retry_wait, progress_callback,
timeout):
if max_connections <= 1:
raise ValueError(_ERROR_NO_SINGLE_THREAD_CHUNKING.format('file'))
downloader = _FileChunkDownloader(
file_service,
share_name,
directory_name,
file_name,
file_size,
block_size,
start_range,
end_range,
stream,
max_retries,
retry_wait,
progress_callback,
timeout
)
if progress_callback is not None:
progress_callback(0, file_size)
import concurrent.futures
executor = concurrent.futures.ThreadPoolExecutor(max_connections)
result = list(executor.map(downloader.process_chunk, downloader.get_chunk_offsets()))
def _upload_file_chunks(file_service, share_name, directory_name, file_name,
file_size, block_size, stream, max_connections,
max_retries, retry_wait, progress_callback, timeout):
uploader = _FileChunkUploader(
file_service,
share_name,
directory_name,
file_name,
file_size,
block_size,
stream,
max_connections > 1,
max_retries,
retry_wait,
progress_callback,
timeout
)
if progress_callback is not None:
progress_callback(0, file_size)
if max_connections > 1:
import concurrent.futures
executor = concurrent.futures.ThreadPoolExecutor(max_connections)
range_ids = list(executor.map(uploader.process_chunk, uploader.get_chunk_offsets()))
else:
if file_size is not None:
range_ids = [uploader.process_chunk(start) for start in uploader.get_chunk_offsets()]
else:
range_ids = uploader.process_all_unknown_size()
return range_ids
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