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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 definesrequest()
with the same interface asrequests.Session.request()
. If not passed, an_http
object is created that is bound to thecredentials
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. IfNone
, 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
ordict
) – (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
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
Return type
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, user_project=None)
Create an HMAC key for a service account.
Parameters
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
orNoneType
(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
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, user_project=None)
Return a metadata instance for the given HMAC key.
Parameters
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
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 thepages
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 thepages
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
Raises
ValueError – if both
project
isNone
and the client’s project is alsoNone
.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, user_project=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.
user_project (str) – (Optional) This parameter is currently ignored.
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
Returns
The bucket matching the name provided or None if not found.