aio Package

Classes

BlobClient

A client to interact with a specific blob, although that blob may not yet exist.

BlobLeaseClient

Creates a new BlobLeaseClient.

This client provides lease operations on a BlobClient or ContainerClient.

BlobServiceClient

A client to interact with the Blob Service at the account level.

This client provides operations to retrieve and configure the account properties as well as list, create and delete containers within the account. For operations relating to a specific container or blob, clients for those entities can also be retrieved using the get_client functions.

ContainerClient

A client to interact with a specific container, although that container may not yet exist.

For operations relating to a specific blob within this container, a blob client can be retrieved using the get_blob_client function.

ExponentialRetry

Exponential retry.

LinearRetry

Linear retry.

StorageStreamDownloader

A streaming object to download from Azure Storage.

Functions

download_blob_from_url

Download the contents of a blob to a local file or stream.

download_blob_from_url(blob_url, output, credential=None, **kwargs)

Parameters

blob_url
str
Required

The full URI to the blob. This can also include a SAS token.

output
str or <xref:<xref:writable stream>>
Required

Where the data should be downloaded to. This could be either a file path to write to, or an open IO handle to write to.

credential
default value: None

The credentials with which to authenticate. This is optional if the blob URL already has a SAS token or the blob is public. The value can be a SAS token string, an instance of a AzureSasCredential from azure.core.credentials, an account shared access key, or an instance of a TokenCredentials class from azure.identity. If the resource URI already contains a SAS token, this will be ignored in favor of an explicit credential

  • except in the case of AzureSasCredential, where the conflicting SAS tokens will raise a ValueError.
overwrite
bool

Whether the local file should be overwritten if it already exists. The default value is False - in which case a ValueError will be raised if the file already exists. If set to True, an attempt will be made to write to the existing file. If a stream handle is passed in, this value is ignored.

max_concurrency
int

The number of parallel connections with which to download.

offset
int

Start of byte range to use for downloading a section of the blob. Must be set if length is provided.

length
int

Number of bytes to read from the stream. This is optional, but should be supplied for optimal performance.

validate_content
bool

If true, calculates an MD5 hash for each chunk of the blob. The storage service checks the hash of the content that has arrived with the hash that was sent. This is primarily valuable for detecting bitflips on the wire if using http instead of https as https (the default) will already validate. Note that this MD5 hash is not stored with the blob. Also note that if enabled, the memory-efficient upload algorithm will not be used, because computing the MD5 hash requires buffering entire blocks, and doing so defeats the purpose of the memory-efficient algorithm.

Return type

upload_blob_to_url

Upload data to a given URL

The data will be uploaded as a block blob.

upload_blob_to_url(blob_url, data, credential=None, **kwargs)

Parameters

blob_url
str
Required

The full URI to the blob. This can also include a SAS token.

data
bytes or str or <xref:Iterable>
Required

The data to upload. This can be bytes, text, an iterable or a file-like object.

credential
default value: None

The credentials with which to authenticate. This is optional if the blob URL already has a SAS token. The value can be a SAS token string, an instance of a AzureSasCredential from azure.core.credentials, an account shared access key, or an instance of a TokenCredentials class from azure.identity. If the resource URI already contains a SAS token, this will be ignored in favor of an explicit credential

  • except in the case of AzureSasCredential, where the conflicting SAS tokens will raise a ValueError.
overwrite
bool

Whether the blob to be uploaded should overwrite the current data. If True, upload_blob_to_url will overwrite any existing data. If set to False, the operation will fail with a ResourceExistsError.

max_concurrency
int

The number of parallel connections with which to download.

length
int

Number of bytes to read from the stream. This is optional, but should be supplied for optimal performance.

metadata
dict(<xref:str,str>)

Name-value pairs associated with the blob as metadata.

validate_content
bool

If true, calculates an MD5 hash for each chunk of the blob. The storage service checks the hash of the content that has arrived with the hash that was sent. This is primarily valuable for detecting bitflips on the wire if using http instead of https as https (the default) will already validate. Note that this MD5 hash is not stored with the blob. Also note that if enabled, the memory-efficient upload algorithm will not be used, because computing the MD5 hash requires buffering entire blocks, and doing so defeats the purpose of the memory-efficient algorithm.

encoding
str

Encoding to use if text is supplied as input. Defaults to UTF-8.

Returns

Blob-updated property dict (Etag and last modified)

Return type

dict(str, <xref:Any>)