How to use the s3transfer.utils.ChunksizeAdjuster function in s3transfer

            lambda: ChunksizeAdjuster(min_size=1))
        self.adjuster_patch.start()

def get_chunksize(filesize):
    return ChunksizeAdjuster().adjust_chunksize(DEFAULT_CHUNKSIZE, filesize)

'extra_args': call_args.extra_args,
                }
            )
        )

        # Submit requests to upload the parts of the file.
        part_futures = []
        extra_part_args = self._extra_upload_part_args(call_args.extra_args)

        # Get any tags that need to be associated to the submitted task
        # for upload the data
        upload_part_tag = self._get_upload_task_tag(
            upload_input_manager, 'upload_part')

        size = transfer_future.meta.size
        adjuster = ChunksizeAdjuster()
        chunksize = adjuster.adjust_chunksize(config.multipart_chunksize, size)
        part_iterator = upload_input_manager.yield_upload_part_bodies(
            transfer_future, chunksize)

        for part_number, fileobj in part_iterator:
            part_futures.append(
                self._transfer_coordinator.submit(
                    request_executor,
                    UploadPartTask(
                        transfer_coordinator=self._transfer_coordinator,
                        main_kwargs={
                            'client': client,
                            'fileobj': fileobj,
                            'bucket': call_args.bucket,
                            'key': call_args.key,
                            'part_number': part_number,

def _calculate_etag(file_path):
    """
    Attempts to calculate a local file's ETag the way S3 does:
    - Normal uploads: MD5 of the file
    - Multi-part uploads: MD5 of the (binary) MD5s of the parts, dash, number of parts
    We can't know how the file was actually uploaded - but we're assuming it was done using
    the default settings, which we get from `s3_transfer_config`.
    """
    size = pathlib.Path(file_path).stat().st_size
    with open(file_path, 'rb') as fd:
        if size <= s3_transfer_config.multipart_threshold:
            contents = fd.read()
            etag = hashlib.md5(contents).hexdigest()
        else:
            adjuster = ChunksizeAdjuster()
            chunksize = adjuster.adjust_chunksize(s3_transfer_config.multipart_chunksize, size)

            hashes = []
            while True:
                contents = fd.read(chunksize)
                if not contents:
                    break
                hashes.append(hashlib.md5(contents).digest())
            etag = '%s-%d' % (hashlib.md5(b''.join(hashes)).hexdigest(), len(hashes))
    return '"%s"' % etag

if extra_args:
            params.update(extra_args)

        resp = s3_client.copy_object(**params)
        ctx.progress(size)
        version_id = resp.get('VersionId')  # Absent in unversioned buckets.
        ctx.done(make_s3_url(dest_bucket, dest_key, version_id))
    else:
        resp = s3_client.create_multipart_upload(
            Bucket=dest_bucket,
            Key=dest_key,
        )
        upload_id = resp['UploadId']

        adjuster = ChunksizeAdjuster()
        chunksize = adjuster.adjust_chunksize(s3_transfer_config.multipart_chunksize, size)

        chunk_offsets = list(range(0, size, chunksize))

        lock = Lock()
        remaining = len(chunk_offsets)
        parts = [None] * remaining

        def upload_part(i, start, end):
            nonlocal remaining
            part_id = i + 1
            part = s3_client.upload_part_copy(
                CopySource=src_params,
                CopySourceRange=f'bytes={start}-{end-1}',
                Bucket=dest_bucket,
                Key=dest_key,

resp = s3_client.put_object(
                Body=fd,
                Bucket=dest_bucket,
                Key=dest_key,
            )

        version_id = resp.get('VersionId')  # Absent in unversioned buckets.
        ctx.done(make_s3_url(dest_bucket, dest_key, version_id))
    else:
        resp = s3_client.create_multipart_upload(
            Bucket=dest_bucket,
            Key=dest_key,
        )
        upload_id = resp['UploadId']

        adjuster = ChunksizeAdjuster()
        chunksize = adjuster.adjust_chunksize(s3_transfer_config.multipart_chunksize, size)

        chunk_offsets = list(range(0, size, chunksize))

        lock = Lock()
        remaining = len(chunk_offsets)
        parts = [None] * remaining

        def upload_part(i, start, end):
            nonlocal remaining
            part_id = i + 1
            with OSUtils().open_file_chunk_reader(src_path, start, end-start, [ctx.progress]) as fd:
                part = s3_client.upload_part(
                    Body=fd,
                    Bucket=dest_bucket,
                    Key=dest_key,

request_executor,
            CreateMultipartUploadTask(
                transfer_coordinator=self._transfer_coordinator,
                main_kwargs={
                    'client': client,
                    'bucket': call_args.bucket,
                    'key': call_args.key,
                    'extra_args': create_multipart_extra_args,
                }
            )
        )

        # Determine how many parts are needed based on filesize and
        # desired chunksize.
        part_size = config.multipart_chunksize
        adjuster = ChunksizeAdjuster()
        part_size = adjuster.adjust_chunksize(
            part_size, transfer_future.meta.size)
        num_parts = int(
            math.ceil(transfer_future.meta.size / float(part_size)))

        # Submit requests to upload the parts of the file.
        part_futures = []
        progress_callbacks = get_callbacks(transfer_future, 'progress')

        for part_number in range(1, num_parts + 1):
            extra_part_args = self._extra_upload_part_args(
                call_args.extra_args)
            # The part number for upload part starts at 1 while the
            # range parameter starts at zero, so just subtract 1 off of
            # the part number
            extra_part_args['CopySourceRange'] = calculate_range_parameter(