File size: 3,312 Bytes
2c3c408 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 | # vfs.py
#
# LICENSE
#
# The MIT License
#
# Copyright (c) 2020 TileDB, Inc.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
# DESCRIPTION
#
# Please see the TileDB documentation for more information:
# https://docs.tiledb.com/main/how-to/virtual-filesystem
#
# This program explores the various TileDB VFS tools.
#
import os
import struct
import tiledb
def path(p):
return os.path.join(os.getcwd(), p)
def dirs_files():
# Create TileDB VFS
vfs = tiledb.VFS()
# Create directory
if not vfs.is_dir("dir_A"):
vfs.create_dir(path("dir_A"))
print("Created 'dir_A'")
else:
print("'dir_A' already exists")
# Creating an (empty) file
if not vfs.is_file("dir_A/file_A"):
vfs.touch(path("dir_A/file_A"))
print("Created empty file 'dir_A/file_A'")
else:
print("'dir_A/file_A' already exists")
# Getting the file size
print("Size of file 'dir_A/file_A': {}".format(vfs.file_size(path("dir_A/file_A"))))
# Moving files (moving directories is similar)
print("Moving file 'dir_A/file_A' to 'dir_A/file_B'")
vfs.move_file(path("dir_A/file_A"), path("dir_A/file_B"))
# Deleting files and directories
print("Deleting 'dir_A/file_B' and 'dir_A'")
vfs.remove_file(path("dir_A/file_B"))
vfs.remove_dir(path("dir_A"))
def write():
# Create TileDB VFS
vfs = tiledb.VFS()
# Write binary data
with vfs.open("tiledb_vfs.bin", "wb") as f:
f.write(struct.pack("f", 153.0))
f.write("abcd".encode("utf-8"))
# Write binary data again - this will overwrite the previous file
with vfs.open("tiledb_vfs.bin", "wb") as f:
f.write(struct.pack("f", 153.1))
f.write("abcdef".encode("utf-8"))
# Append binary data to existing file (this will NOT work on S3)
with vfs.open("tiledb_vfs.bin", "ab") as f:
f.write("ghijkl".encode("utf-8"))
def read():
# Create TileDB VFS
vfs = tiledb.VFS()
# Read binary data
with vfs.open("tiledb_vfs.bin", "rb") as f:
# Read the first 4 bytes (bytes [0:4])
f1 = struct.unpack("f", f.read(4))[0]
# Read the next 8 bytes (bytes [4:12])
s1 = bytes.decode(f.read(8), "utf-8")
print(f"Binary read:\n{f1}\n{s1}")
dirs_files()
write()
read()
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