Storage Client

Client for interacting with the Google Cloud Storage API.

class google.cloud.storage.client.Client(project=

Bases: google.cloud.client.ClientWithProject

Client to bundle configuration needed for API requests.

Parameters
- project (str* or [None*](https://python.readthedocs.io/en/latest/library/constants.html#None)) – the project which the client acts on behalf of. Will be passed when creating a topic. If not passed, falls back to the default inferred from the environment.
- credentials (Credentials) – (Optional) The OAuth2 Credentials to use for this client. If not passed (and if no _http object is passed), falls back to the default inferred from the environment.
- _http (Session) – (Optional) HTTP object to make requests. Can be any object that defines request() with the same interface as requests.Session.request(). If not passed, an _http object is created that is bound to the credentials for the current object. This parameter should be considered private, and could change in the future.
- client_info (ClientInfo) – The client info used to send a user-agent string along with API requests. If None, then default info will be used. Generally, you only need to set this if you’re developing your own library or partner tool.
- client_options (ClientOptions or dict) – (Optional) Client options used to set user options on the client. API Endpoint should be set through client_options.

SCOPE( = ('https://www.googleapis.com/auth/devstorage.full_control', 'https://www.googleapis.com/auth/devstorage.read_only', 'https://www.googleapis.com/auth/devstorage.read_write' )

The scopes required for authenticating as a Cloud Storage consumer.

batch()

Factory constructor for batch object.

NOTE: This will not make an HTTP request; it simply instantiates a batch object owned by this client.

Return type

google.cloud.storage.batch.Batch
Returns

The batch object created.

bucket(bucket_name, user_project=None)

Factory constructor for bucket object.

NOTE: This will not make an HTTP request; it simply instantiates a bucket object owned by this client.

Parameters
- bucket_name (str) – The name of the bucket to be instantiated.
- user_project (str) – (Optional) the project ID to be billed for API requests made via the bucket.
Return type

google.cloud.storage.bucket.Bucket
Returns

The bucket object created.

classmethod create_anonymous_client()

Factory: return client with anonymous credentials.

NOTE: Such a client has only limited access to “public” buckets: listing their contents and downloading their blobs.

Return type

google.cloud.storage.client.Client
Returns

Instance w/ anonymous credentials and no project.

create_bucket(bucket_or_name, requester_pays=None, project=None)

API call: create a new bucket via a POST request.

See https://cloud.google.com/storage/docs/json_api/v1/buckets/insert

Parameters
- bucket_or_name (Union[ Bucket, str, ]) – The bucket resource to pass or name to create.
- requester_pays (bool) – Optional. Whether requester pays for API requests for this bucket and its blobs.
- project (str) – Optional. the project under which the bucket is to be created. If not passed, uses the project set on the client.
Returns

google.cloud.storage.bucket.Bucket
```
  The newly created bucket.
```
Raises

google.cloud.exceptions.Conflict – If the bucket already exists.

Examples

Create a bucket using a string.

    bucket = client.create_bucket("my-bucket")
    assert isinstance(bucket, Bucket)
    # <Bucket: my-bucket>

Create a bucket using a resource.

>>> from google.cloud import storage
>>> client = storage.Client()

>>> # Set properties on a plain resource object.
>>> bucket = storage.Bucket("my-bucket-name")
>>> bucket.location = "europe-west6"
>>> bucket.storage_class = "COLDLINE"

>>> # Pass that resource object to the client.
>>> bucket = client.create_bucket(bucket)  # API request.

create_hmac_key(service_account_email, project_id=None)

Create an HMAC key for a service account.

Parameters
- service_account_email (str) – e-mail address of the service account
- project_id (str) – (Optional) explicit project ID for the key. Defaults to the client’s project.
Return type

Tuple[HMACKeyMetadata, str]
Returns

metadata for the created key, plus the bytes of the key’s secret, which is an 40-character base64-encoded string.

property current_batch()

Currently-active batch.

Return type

google.cloud.storage.batch.Batch or NoneType (if no batch is active).
Returns

The batch at the top of the batch stack.

download_blob_to_file(blob_or_uri, file_obj, start=None, end=None)

Download the contents of a blob object or blob URI into a file-like object.

Parameters
- blob_or_uri (Union[ Blob, str, ]) – The blob resource to pass or URI to download.
- file_obj (file) – A file handle to which to write the blob’s data.
- start (int) – Optional. The first byte in a range to be downloaded.
- end (int) – Optional. The last byte in a range to be downloaded.

Examples

Download a blob using using a blob resource.

>>> from google.cloud import storage
>>> client = storage.Client()

>>> bucket = client.get_bucket('my-bucket-name')
>>> blob = storage.Blob('path/to/blob', bucket)

>>> with open('file-to-download-to') as file_obj:
>>>     client.download_blob_to_file(blob, file_obj)  # API request.

Download a blob using a URI.

>>> from google.cloud import storage
>>> client = storage.Client()

>>> with open('file-to-download-to') as file_obj:
>>>     client.download_blob_to_file(
>>>         'gs://bucket_name/path/to/blob', file_obj)

get_bucket(bucket_or_name)

API call: retrieve a bucket via a GET request.

See https://cloud.google.com/storage/docs/json_api/v1/buckets/get

Parameters

bucket_or_name (Union[ Bucket, str, ]) – The bucket resource to pass or name to create.

Returns

google.cloud.storage.bucket.Bucket

  The bucket matching the name provided.

Raises

google.cloud.exceptions.NotFound – If the bucket is not found.

Examples

Retrieve a bucket using a string.

    try:
        bucket = client.get_bucket("my-bucket")
    except google.cloud.exceptions.NotFound:
        print("Sorry, that bucket does not exist!")

Get a bucket using a resource.

>>> from google.cloud import storage
>>> client = storage.Client()

>>> # Set properties on a plain resource object.
>>> bucket = client.get_bucket("my-bucket-name")

>>> # Time passes. Another program may have modified the bucket
... # in the meantime, so you want to get the latest state.
>>> bucket = client.get_bucket(bucket)  # API request.

get_hmac_key_metadata(access_id, project_id=None)

Return a metadata instance for the given HMAC key.

Parameters
- access_id (str) – Unique ID of an existing key.
- project_id (str) – (Optional) project ID of an existing key. Defaults to client’s project.

get_service_account_email(project=None)

Get the email address of the project’s GCS service account

Parameters

project (str) – (Optional) Project ID to use for retreiving GCS service account email address. Defaults to the client’s project.
Return type

str
Returns

service account email address

list_blobs(bucket_or_name, max_results=None, page_token=None, prefix=None, delimiter=None, versions=None, projection='noAcl', fields=None)

Return an iterator used to find blobs in the bucket.

If user_project is set, bills the API request to that project.

Parameters
- bucket_or_name (Union[ Bucket, str, ]) – The bucket resource to pass or name to create.
- max_results (int) – (Optional) The maximum number of blobs in each page of results from this request. Non-positive values are ignored. Defaults to a sensible value set by the API.
- page_token (str) – (Optional) If present, return the next batch of blobs, using the value, which must correspond to the nextPageToken value returned in the previous response. Deprecated: use the pages property of the returned iterator instead of manually passing the token.
- prefix (str) – (Optional) prefix used to filter blobs.
- delimiter (str) – (Optional) Delimiter, used with prefix to emulate hierarchy.
- versions (bool) – (Optional) Whether object versions should be returned as separate blobs.
- projection (str) – (Optional) If used, must be ‘full’ or ‘noAcl’. Defaults to 'noAcl'. Specifies the set of properties to return.
- fields (str) – (Optional) Selector specifying which fields to include in a partial response. Must be a list of fields. For example to get a partial response with just the next page token and the name and language of each blob returned: 'items(name,contentLanguage),nextPageToken'. See: https://cloud.google.com/storage/docs/json_api/v1/parameters#fields
Returns

Iterator of all Blob in this bucket matching the arguments.

list_buckets(max_results=None, page_token=None, prefix=None, projection='noAcl', fields=None, project=None)

Get all buckets in the project associated to the client.

This will not populate the list of blobs available in each bucket.

    for bucket in client.list_buckets():
        print(bucket)

This implements “storage.buckets.list”.

Parameters
- max_results (int) – Optional. The maximum number of buckets to return.
- page_token (str) – Optional. If present, return the next batch of buckets, using the value, which must correspond to the nextPageToken value returned in the previous response. Deprecated: use the pages property of the returned iterator instead of manually passing the token.
- prefix (str) – Optional. Filter results to buckets whose names begin with this prefix.
- projection (str) – (Optional) Specifies the set of properties to return. If used, must be ‘full’ or ‘noAcl’. Defaults to ‘noAcl’.
- fields (str) – (Optional) Selector specifying which fields to include in a partial response. Must be a list of fields. For example to get a partial response with just the next page token and the language of each bucket returned: ‘items/id,nextPageToken’
- project (str) – (Optional) the project whose buckets are to be listed. If not passed, uses the project set on the client.
Return type

Iterator
Raises

ValueError – if both project is None and the client’s project is also None.
Returns

Iterator of all Bucket belonging to this project.

list_hmac_keys(max_results=None, service_account_email=None, show_deleted_keys=None, project_id=None)

List HMAC keys for a project.

Parameters
- max_results (int) – (Optional) max number of keys to return in a given page.
- service_account_email (str) – (Optional) limit keys to those created by the given service account.
- show_deleted_keys (bool) – (Optional) included deleted keys in the list. Default is to exclude them.
- project_id (str) – (Optional) explicit project ID for the key. Defaults to the client’s project.
Return type

Tuple[HMACKeyMetadata, str]
Returns

metadata for the created key, plus the bytes of the key’s secret, which is an 40-character base64-encoded string.

lookup_bucket(bucket_name)

Get a bucket by name, returning None if not found.

You can use this if you would rather check for a None value than catching an exception:

    bucket = client.lookup_bucket("doesnt-exist")
    assert not bucket
    # None
    bucket = client.lookup_bucket("my-bucket")
    assert isinstance(bucket, Bucket)
    # <Bucket: my-bucket>

Parameters

bucket_name (str) – The name of the bucket to get.
Return type

google.cloud.storage.bucket.Bucket
Returns

The bucket matching the name provided or None if not found.