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# coding: utf-8
# -------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See License.txt in the project root for
# license information.
# --------------------------------------------------------------------------
"""
FILE: datalake_samples_directory_async.py
DESCRIPTION:
This sample demonstrates create directory, rename directory, get directory properties, delete directory etc.
USAGE:
python datalake_samples_directory_async.py
Set the environment variables with your own values before running the sample:
1) DATALAKE_STORAGE_ACCOUNT_NAME - the storage account name
2) DATALAKE_STORAGE_ACCOUNT_KEY - the storage account key
"""
import asyncio
import os
import random
import uuid
from azure.core.exceptions import ResourceExistsError
from azure.storage.filedatalake.aio import (
DataLakeServiceClient,
)
async def directory_sample(filesystem_client):
# create a parent directory
dir_name = "testdirasync"
print("Creating a directory named '{}'.".format(dir_name))
# Create directory from file system client
await filesystem_client.create_directory(dir_name)
directory_client = filesystem_client.get_directory_client(dir_name)
try:
# Create the existing directory again will throw exception
# [START create_directory]
await directory_client.create_directory()
# [END create_directory]
except ResourceExistsError:
pass
# populate the directory with some child files
await create_child_files(directory_client, 35)
# rename the directory
# [START rename_directory]
new_dir_name = "testdir2async"
print("Renaming the directory named '{}' to '{}'.".format(dir_name, new_dir_name))
new_directory = await directory_client\
.rename_directory(new_name=directory_client.file_system_name + '/' + new_dir_name)
# [END rename_directory]
# display the properties of the new directory to make sure it was renamed successfully
# [START get_directory_properties]
props = await new_directory.get_directory_properties()
# [END get_directory_properties]
print("Properties of the new directory named '{}' are: {}.".format(new_dir_name, props))
# remove the newly renamed directory
print("Removing the directory named '{}'.".format(new_dir_name))
# [START delete_directory]
await new_directory.delete_directory()
# [END delete_directory]
async def create_child_files(directory_client, num_child_files):
import itertools
# Use a thread pool because it is too slow otherwise
async def create_file():
# generate a random name
file_name = str(uuid.uuid4()).replace('-', '')
file_client = directory_client.get_file_client(file_name)
await file_client.create_file()
futures = [asyncio.ensure_future(create_file()) for _ in itertools.repeat(None, num_child_files)]
await asyncio.wait(futures)
print("Created {} files under the directory '{}'.".format(num_child_files, directory_client.path_name))
async def main():
account_name = os.getenv('DATALAKE_STORAGE_ACCOUNT_NAME', "")
account_key = os.getenv('DATALAKE_STORAGE_ACCOUNT_KEY', "")
# set up the service client with the credentials from the environment variables
service_client = DataLakeServiceClient(account_url="{}://{}.dfs.core.windows.net".format(
"https",
account_name
), credential=account_key)
async with service_client:
# generate a random name for testing purpose
fs_name = "testfs{}".format(random.randint(1, 1000))
print("Generating a test filesystem named '{}'.".format(fs_name))
# create the filesystem
filesystem_client = await service_client.create_file_system(file_system=fs_name)
# invoke the sample code
try:
await directory_sample(filesystem_client)
finally:
# clean up the demo filesystem
await filesystem_client.delete_file_system()
if __name__ == '__main__':
asyncio.run(main())
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