async def __get_file_client(directory_client: DataLakeDirectoryClient, path):
file_client: DataLakeFileClient = directory_client.get_file_client(path)
try:
await file_client.get_file_properties()
except ResourceNotFoundError:
# We return None to indicate that the file doesnt exist.
return None
except HttpResponseError as error:
message = f'({type(error).__name__}) Problems checking if file exist: {error}'
raise HTTPException(status_code=error.status_code,
detail=message) from error
return file_client
async def download_file(
filename: str,
directory_client: DataLakeDirectoryClient) -> StorageStreamDownloader:
"""
Downloads file from directory_client.
Args:
filename (str): Filename to download from directory_client
directory_client (DataLakeDirectoryClient): Client to download from.
Returns:
Downloaded file content
"""
file_client = directory_client.get_file_client(filename)
try:
downloaded_file = await file_client.download_file()
return downloaded_file
except HttpResponseError as error:
message = f'({type(error).__name__}) File could not be downloaded: {error}'
raise HTTPException(status_code=error.status_code,
detail=message) from error
