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######################################################################
#
# File: b2sdk/_internal/transfer/outbound/large_file_upload_state.py
#
# Copyright 2020 Backblaze Inc. All Rights Reserved.
#
# License https://www.backblaze.com/using_b2_code.html
#
######################################################################
from __future__ import annotations
import threading
class LargeFileUploadState:
"""
Track the status of uploading a large file, accepting updates
from the tasks that upload each of the parts.
The aggregated progress is passed on to a ProgressListener that
reports the progress for the file as a whole.
This class is THREAD SAFE.
"""
def __init__(self, file_progress_listener):
"""
:param b2sdk.v2.AbstractProgressListener file_progress_listener: a progress listener object to use. Use :py:class:`b2sdk.v2.DoNothingProgressListener` to disable.
"""
self.lock = threading.RLock()
self.error_message = None
self.file_progress_listener = file_progress_listener
self.part_number_to_part_state = {}
self.bytes_completed = 0
def set_error(self, message):
"""
Set an error message.
:param str message: an error message
"""
with self.lock:
self.error_message = message
def has_error(self):
"""
Check whether an error occurred.
:rtype: bool
"""
with self.lock:
return self.error_message is not None
def get_error_message(self):
"""
Fetche an error message.
:return: an error message
:rtype: str
"""
with self.lock:
assert self.has_error()
return self.error_message
def update_part_bytes(self, bytes_delta):
"""
Update listener progress info.
:param int bytes_delta: number of bytes to increase a progress for
"""
with self.lock:
self.bytes_completed += bytes_delta
self.file_progress_listener.bytes_completed(self.bytes_completed)
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