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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_file_system_async.py
DESCRIPTION:
This sample demonstrates common file system operations including list paths, create a file system,
set metadata etc.
USAGE:
python datalake_samples_file_system_async.py
Set the environment variables with your own values before running the sample:
1) DATALAKE_STORAGE_CONNECTION_STRING - the connection string to your storage account
"""
import asyncio
import os
from azure.core.exceptions import ResourceExistsError
current_dir = os.path.dirname(os.path.abspath(__file__))
SOURCE_FILE = os.path.join(current_dir, "SampleSource.txt")
class FileSystemSamplesAsync(object):
connection_string = os.environ['DATALAKE_STORAGE_CONNECTION_STRING']
#--Begin File System Samples-----------------------------------------------------------------
async def file_system_sample(self):
# [START create_file_system_client_from_service]
# Instantiate a DataLakeServiceClient using a connection string
from azure.storage.filedatalake.aio import DataLakeServiceClient
datalake_service_client = DataLakeServiceClient.from_connection_string(self.connection_string)
async with datalake_service_client:
# Instantiate a FileSystemClient
file_system_client = datalake_service_client.get_file_system_client("mynewfilesystemsasync")
# [END create_file_system_client_from_service]
try:
# [START create_file_system]
await file_system_client.create_file_system()
# [END create_file_system]
# [START get_file_system_properties]
properties = await file_system_client.get_file_system_properties()
# [END get_file_system_properties]
finally:
# [START delete_file_system]
await file_system_client.delete_file_system()
# [END delete_file_system]
async def acquire_lease_on_file_system(self):
# Instantiate a DataLakeServiceClient using a connection string
# [START create_data_lake_service_client_from_conn_str]
from azure.storage.filedatalake.aio import DataLakeServiceClient
datalake_service_client = DataLakeServiceClient.from_connection_string(self.connection_string)
# [END create_data_lake_service_client_from_conn_str]
async with datalake_service_client:
# Instantiate a FileSystemClient
file_system_client = datalake_service_client.get_file_system_client("myleasefilesystemasync")
# Create new File System
try:
await file_system_client.create_file_system()
except ResourceExistsError:
pass
# [START acquire_lease_on_file_system]
# Acquire a lease on the file system
lease = await file_system_client.acquire_lease()
# Delete file system by passing in the lease
await file_system_client.delete_file_system(lease=lease)
# [END acquire_lease_on_file_system]
async def set_metadata_on_file_system(self):
# Instantiate a DataLakeServiceClient using a connection string
from azure.storage.filedatalake.aio import DataLakeServiceClient
datalake_service_client = DataLakeServiceClient.from_connection_string(self.connection_string)
async with datalake_service_client:
# Instantiate a FileSystemClient
file_system_client = datalake_service_client.get_file_system_client("mymetadatafilesystemsyncasync")
try:
# Create new File System
await file_system_client.create_file_system()
# [START set_file_system_metadata]
# Create key, value pairs for metadata
metadata = {'type': 'test'}
# Set metadata on the file system
await file_system_client.set_file_system_metadata(metadata=metadata)
# [END set_file_system_metadata]
# Get file system properties
properties = await file_system_client.get_file_system_properties()
finally:
# Delete file system
await file_system_client.delete_file_system()
async def list_paths_in_file_system(self):
# Instantiate a DataLakeServiceClient using a connection string
from azure.storage.filedatalake.aio import DataLakeServiceClient
datalake_service_client = DataLakeServiceClient.from_connection_string(self.connection_string)
async with datalake_service_client:
# Instantiate a FileSystemClient
file_system_client = datalake_service_client.get_file_system_client("mypathfilesystemasync")
# Create new File System
await file_system_client.create_file_system()
# [START upload_file_to_file_system]
file_client = file_system_client.get_file_client("myfile")
await file_client.create_file()
with open(SOURCE_FILE, "rb") as data:
length = data.tell()
await file_client.append_data(data, 0)
await file_client.flush_data(length)
# [END upload_file_to_file_system]
# [START get_paths_in_file_system]
path_list = file_system_client.get_paths()
async for path in path_list:
print(path.name + '\n')
# [END get_paths_in_file_system]
# Delete file system
await file_system_client.delete_file_system()
async def get_file_client_from_file_system(self):
# Instantiate a DataLakeServiceClient using a connection string
from azure.storage.filedatalake.aio import DataLakeServiceClient
datalake_service_client = DataLakeServiceClient.from_connection_string(self.connection_string)
async with datalake_service_client:
# Instantiate a FileSystemClient
file_system_client = datalake_service_client.get_file_system_client("myclientfilesystemasync")
# Create new File System
try:
await file_system_client.create_file_system()
except ResourceExistsError:
pass
# [START get_file_client_from_file_system]
# Get the FileClient from the FileSystemClient to interact with a specific file
file_client = file_system_client.get_file_client("mynewfile")
# [END get_file_client_from_file_system]
# Delete file system
await file_system_client.delete_file_system()
async def get_directory_client_from_file_system(self):
# Instantiate a DataLakeServiceClient using a connection string
from azure.storage.filedatalake.aio import DataLakeServiceClient
datalake_service_client = DataLakeServiceClient.from_connection_string(self.connection_string)
async with datalake_service_client:
# Instantiate a FileSystemClient
file_system_client = datalake_service_client.get_file_system_client("mydirectoryfilesystemasync")
# Create new File System
try:
await file_system_client.create_file_system()
except ResourceExistsError:
pass
# [START get_directory_client_from_file_system]
# Get the DataLakeDirectoryClient from the FileSystemClient to interact with a specific file
directory_client = file_system_client.get_directory_client("mynewdirectory")
# [END get_directory_client_from_file_system]
# Delete file system
await file_system_client.delete_file_system()
async def create_file_from_file_system(self):
# [START create_file_system_client_from_connection_string]
from azure.storage.filedatalake.aio import FileSystemClient
file_system_client = FileSystemClient.from_connection_string(self.connection_string, "filesystemforcreateasync")
# [END create_file_system_client_from_connection_string]
async with file_system_client:
await file_system_client.create_file_system()
# [START create_directory_from_file_system]
directory_client = await file_system_client.create_directory("mydirectory")
# [END create_directory_from_file_system]
# [START create_file_from_file_system]
file_client = await file_system_client.create_file("myfile")
# [END create_file_from_file_system]
# [START delete_file_from_file_system]
await file_system_client.delete_file("myfile")
# [END delete_file_from_file_system]
# [START delete_directory_from_file_system]
await file_system_client.delete_directory("mydirectory")
# [END delete_directory_from_file_system]
await file_system_client.delete_file_system()
async def main():
sample = FileSystemSamplesAsync()
await sample.file_system_sample()
await sample.acquire_lease_on_file_system()
await sample.set_metadata_on_file_system()
await sample.list_paths_in_file_system()
await sample.get_file_client_from_file_system()
await sample.create_file_from_file_system()
if __name__ == '__main__':
asyncio.run(main())
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