51 lines
1.7 KiB
Python
51 lines
1.7 KiB
Python
# Copyright 2019 The TensorFlow Authors. 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 struct
|
|
from tensorboard.compat.tensorflow_stub.pywrap_tensorflow import masked_crc32c
|
|
|
|
|
|
class RecordWriter:
|
|
"""Write encoded protobuf to a file with packing defined in tensorflow."""
|
|
|
|
def __init__(self, writer):
|
|
"""Open a file to keep the tensorboard records.
|
|
|
|
Args:
|
|
writer: A file-like object that implements `write`, `flush` and `close`.
|
|
"""
|
|
self._writer = writer
|
|
|
|
# Format of a single record: (little-endian)
|
|
# uint64 length
|
|
# uint32 masked crc of length
|
|
# byte data[length]
|
|
# uint32 masked crc of data
|
|
def write(self, data):
|
|
header = struct.pack("<Q", len(data))
|
|
header_crc = struct.pack("<I", masked_crc32c(header))
|
|
footer_crc = struct.pack("<I", masked_crc32c(data))
|
|
self._writer.write(header + header_crc + data + footer_crc)
|
|
|
|
def flush(self):
|
|
self._writer.flush()
|
|
|
|
def close(self):
|
|
self._writer.close()
|
|
|
|
@property
|
|
def closed(self):
|
|
return self._writer.closed
|