Skip to content
Permalink
Branch: master
Find file Copy path
Find file Copy path
Fetching contributors…
Cannot retrieve contributors at this time
71 lines (51 sloc) 2.39 KB

Working with object storage

Object storage provides a simple way to store and retrieve large amounts of unstructured data over HTTP. Object Storage is also referred to as Blob (Binary Large OBject) Storage by Azure, and Simple Storage Service (S3) by Amazon.

Typically, you would store your objects within a Bucket, as it is known in AWS and GCP. A Bucket is also called a Container in OpenStack and Azure. In CloudBridge, we use the term Bucket.

Storing objects in a bucket

To store an object within a bucket, we need to first create a bucket or retrieve an existing bucket.

bucket = provider.storage.buckets.create('my-bucket')
bucket.objects.list()

Next, let's upload some data to this bucket. To efficiently upload a file, simple use the upload_from_file method.

obj = bucket.objects.create('my-data.txt')
obj.upload_from_file('/path/to/myfile.txt')

You can also use the upload() function to upload from an in memory stream. Note that, an object you create with objects.create() doesn't actually get persisted until you upload some content.

To locate and download this uploaded file again, you can do the following:

bucket = provider.storage.buckets.find(name='my-bucket')[0]
obj = bucket.objects.find(name='my-data.txt')[0]
print("Size: {0}, Modified: {1}".format(obj.size, obj.last_modified))
with open('/tmp/myfile.txt', 'wb') as f:
    obj.save_content(f)

Using tokens for authentication

Some providers may support using temporary credentials with a session token, in which case you will be able to access a particular bucket by using that session token.

provider = CloudProviderFactory().create_provider(
    ProviderList.AWS,
    {'aws_access_key': 'ACCESS_KEY',
     'aws_secret_key': 'SECRET_KEY',
     'aws_session_token': 'MY_SESSION_TOKEN'})
provider = CloudProviderFactory().create_provider(
    ProviderList.OPENSTACK,
    {'os_storage_url': 'SWIFT_STORAGE_URL',
     'os_auth_token': 'MY_SESSION_TOKEN'})

Once a provider is obtained, you can access the container as usual:

bucket = provider.storage.buckets.get(container)
obj = bucket.objects.create('my_object.txt')
obj.upload_from_file(source)
You can’t perform that action at this time.