Source code for toil.fileStores
# Copyright (C) 2015-2019 Regents of the University of California
#
# 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.
from __future__ import absolute_import
import os
__all__ = ['fileStore', 'nonCachingFileStore', 'cachingFileStore', 'FileID']
[docs]class FileID(str):
"""
A small wrapper around Python's builtin string class. It is used to represent a file's ID in the file store, and
has a size attribute that is the file's size in bytes. This object is returned by importFile and writeGlobalFile.
Calls into the file store can use bare strings; size will be queried from the job store if unavailable in the ID.
"""
def __new__(cls, fileStoreID, *args):
return super(FileID, cls).__new__(cls, fileStoreID)
[docs] def __init__(self, fileStoreID, size):
# Don't pass an argument to parent class's __init__.
# In Python 3 we can have super(FileID, self) hand us object's __init__ which chokes on any arguments.
super(FileID, self).__init__()
self.size = size
[docs] def pack(self):
"""
Pack the FileID into a string so it can be passed through external code.
"""
return '{}:{}'.format(self.size, self)
@classmethod
def forPath(cls, fileStoreID, filePath):
return cls(fileStoreID, os.stat(filePath).st_size)
[docs] @classmethod
def unpack(cls, packedFileStoreID):
"""
Unpack the result of pack() into a FileID object.
"""
# Find the separating character (first instance)
sepPos = packedFileStoreID.find(':')
# Break up the packed value
size = int(packedFileStoreID[:sepPos])
value = packedFileStoreID[(sepPos + 1):]
# Create the FileID
return cls(value, size)