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# Copyright (c) 2020-2024 Open Text.
#
# 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.
"""
WriteFile message
In the copy-local protocol, the server may send a WriteFile message when it
receives a batch of copy data. If the COPY FROM LOCAL command uses the
REJECTED DATA and/or EXCEPTIONS parameters, this message contains content of
rejected rows or exceptions output files. If the command uses the
RETURNREJECTED parameters instead, this message is a series of row numbers
saying which rows in the load were rejected.
"""
from __future__ import print_function, division, absolute_import, annotations
from struct import unpack_from
from ..message import BackendMessage
class WriteFile(BackendMessage):
message_id = b'O'
def __init__(self, filename, file_length, data=None):
BackendMessage.__init__(self)
self.filename = filename
self.file_length = file_length
# Parse RETURNREJECTED data
if self.filename == '':
row_count = self.file_length // 8
# Rejected row numbers come in little endian format
self.rejected_rows = unpack_from('<{0}Q'.format(row_count), data)
def write_to_disk(self, connection, buffer_size):
# Read the rest of the message from wire and write the file
bytes_left = self.file_length
with open(self.filename, 'ab') as f:
pos = 0
while bytes_left > 0:
bytes_to_read = min(buffer_size, bytes_left)
content = connection.read_bytes(bytes_to_read)
f.write(content)
bytes_left -= bytes_to_read
def __str__(self):
return "WriteFile: Filename = {}, FileLength = {}".format(self.filename, self.file_length)
BackendMessage.register(WriteFile)
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