# Copyright (c) 2023, NVIDIA CORPORATION. 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 logging
import os
from nvflare.fuel.hci.chunk import MAX_CHUNK_SIZE, Sender
from nvflare.fuel.hci.conn import Connection
from nvflare.fuel.hci.proto import MetaKey, MetaStatusValue, make_meta
from nvflare.fuel.hci.server.constants import ConnProps
class _BytesSender:
def __init__(self, conn: Connection):
self.conn = conn
def send(self, data):
self.conn.flush_bytes(data)
[docs]class BinaryTransfer:
def __init__(self):
self.logger = logging.getLogger(self.__class__.__name__)
[docs] def download_file(self, conn: Connection, tx_id: str, folder_name: str, file_name: str):
conn.binary_mode = True
tx_path = self.tx_path(conn, tx_id, folder_name)
full_path = os.path.join(tx_path, file_name)
if not os.path.exists(full_path):
self.logger.error(f"no such file: {full_path}")
return
if not os.path.isfile(full_path):
self.logger.error(f"not a file: {full_path}")
return
self.logger.debug(f"called to send {full_path} ...")
bytes_sender = _BytesSender(conn)
sender = Sender(send_data_func=bytes_sender.send)
buffer_size = MAX_CHUNK_SIZE
bytes_sent = 0
with open(full_path, mode="rb") as f:
chunk = f.read(buffer_size)
while chunk:
sender.send(chunk)
bytes_sent += len(chunk)
chunk = f.read(buffer_size)
sender.close()
self.logger.debug(f"finished sending {full_path}: {bytes_sent} bytes sent")
[docs] @staticmethod
def tx_path(conn: Connection, tx_id: str, folder_name=None):
download_dir = conn.get_prop(ConnProps.DOWNLOAD_DIR)
if not folder_name:
return os.path.join(download_dir, tx_id)
else:
return os.path.join(download_dir, tx_id, folder_name)
[docs] def download_folder(self, conn: Connection, tx_id: str, folder_name: str, download_file_cmd_name: str):
self.logger.debug(f"download_folder called for {folder_name}")
tx_path = self.tx_path(conn, tx_id, folder_name)
# return list of the files
files = []
for (dir_path, dir_names, file_names) in os.walk(tx_path):
for f in file_names:
p = os.path.join(dir_path, f)
p = os.path.relpath(p, tx_path)
files.append(p)
self.logger.debug(f"files of the folder: {files}")
if len(files) > 0:
conn.append_string(
"OK",
meta=make_meta(
MetaStatusValue.OK,
extra={
MetaKey.FILES: files,
MetaKey.TX_ID: tx_id,
MetaKey.FOLDER_NAME: folder_name,
MetaKey.CMD_NAME: download_file_cmd_name,
},
),
)
else:
conn.append_error(
"No data to download",
meta=make_meta(
MetaStatusValue.ERROR,
info="No data to download",
),
)