As of January 1, 2020 this library no longer supports Python 2 on the latest released version. Library versions released prior to that date will continue to be available. For more information please visit Python 2 support on Google Cloud.

Source code for google.cloud.storage.blob

# Copyright 2014 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# pylint: disable=too-many-lines

"""Create / interact with Google Cloud Storage blobs.

.. _API reference docs: https://cloud.google.com/storage/docs/\
                        json_api/v1/objects
.. _customer-supplied: https://cloud.google.com/storage/docs/\
                       encryption#customer-supplied
.. _google-resumable-media: https://googleapis.github.io/\
                            google-resumable-media-python/latest/\
                            google.resumable_media.requests.html
"""

import base64
import cgi
import copy
import hashlib
from io import BytesIO
from io import TextIOWrapper
import logging
import mimetypes
import os
import re
import warnings

import six
from six.moves.urllib.parse import parse_qsl
from six.moves.urllib.parse import quote
from six.moves.urllib.parse import urlencode
from six.moves.urllib.parse import urlsplit
from six.moves.urllib.parse import urlunsplit

from google import resumable_media
from google.resumable_media.requests import ChunkedDownload
from google.resumable_media.requests import Download
from google.resumable_media.requests import RawDownload
from google.resumable_media.requests import RawChunkedDownload
from google.resumable_media.requests import MultipartUpload
from google.resumable_media.requests import ResumableUpload

from google.api_core.iam import Policy
from google.cloud import exceptions
from google.cloud._helpers import _bytes_to_unicode
from google.cloud._helpers import _datetime_to_rfc3339
from google.cloud._helpers import _rfc3339_nanos_to_datetime
from google.cloud._helpers import _to_bytes
from google.cloud.exceptions import NotFound
from google.cloud.storage._helpers import _add_etag_match_headers
from google.cloud.storage._helpers import _add_generation_match_parameters
from google.cloud.storage._helpers import _PropertyMixin
from google.cloud.storage._helpers import _scalar_property
from google.cloud.storage._helpers import _bucket_bound_hostname_url
from google.cloud.storage._helpers import _convert_to_timestamp
from google.cloud.storage._helpers import _raise_if_more_than_one_set
from google.cloud.storage._helpers import _api_core_retry_to_resumable_media_retry
from google.cloud.storage._signing import generate_signed_url_v2
from google.cloud.storage._signing import generate_signed_url_v4
from google.cloud.storage._helpers import _NUM_RETRIES_MESSAGE
from google.cloud.storage.acl import ACL
from google.cloud.storage.acl import ObjectACL
from google.cloud.storage.constants import _DEFAULT_TIMEOUT
from google.cloud.storage.constants import ARCHIVE_STORAGE_CLASS
from google.cloud.storage.constants import COLDLINE_STORAGE_CLASS
from google.cloud.storage.constants import MULTI_REGIONAL_LEGACY_STORAGE_CLASS
from google.cloud.storage.constants import NEARLINE_STORAGE_CLASS
from google.cloud.storage.constants import REGIONAL_LEGACY_STORAGE_CLASS
from google.cloud.storage.constants import STANDARD_STORAGE_CLASS
from google.cloud.storage.retry import ConditionalRetryPolicy
from google.cloud.storage.retry import DEFAULT_RETRY
from google.cloud.storage.retry import DEFAULT_RETRY_IF_ETAG_IN_JSON
from google.cloud.storage.retry import DEFAULT_RETRY_IF_GENERATION_SPECIFIED
from google.cloud.storage.fileio import BlobReader
from google.cloud.storage.fileio import BlobWriter


_API_ACCESS_ENDPOINT = "https://storage.googleapis.com"
_DEFAULT_CONTENT_TYPE = u"application/octet-stream"
_DOWNLOAD_URL_TEMPLATE = u"{hostname}/download/storage/v1{path}?alt=media"
_BASE_UPLOAD_TEMPLATE = u"{hostname}/upload/storage/v1{bucket_path}/o?uploadType="
_MULTIPART_URL_TEMPLATE = _BASE_UPLOAD_TEMPLATE + u"multipart"
_RESUMABLE_URL_TEMPLATE = _BASE_UPLOAD_TEMPLATE + u"resumable"
# NOTE: "acl" is also writeable but we defer ACL management to
#       the classes in the google.cloud.storage.acl module.
_CONTENT_TYPE_FIELD = "contentType"
_WRITABLE_FIELDS = (
    "cacheControl",
    "contentDisposition",
    "contentEncoding",
    "contentLanguage",
    _CONTENT_TYPE_FIELD,
    "crc32c",
    "customTime",
    "md5Hash",
    "metadata",
    "name",
    "storageClass",
)
_READ_LESS_THAN_SIZE = (
    "Size {:d} was specified but the file-like object only had " "{:d} bytes remaining."
)
_CHUNKED_DOWNLOAD_CHECKSUM_MESSAGE = (
    "A checksum of type `{}` was requested, but checksumming is not available "
    "for downloads when chunk_size is set."
)
_COMPOSE_IF_GENERATION_LIST_DEPRECATED = (
    "'if_generation_match: type list' is deprecated and supported for "
    "backwards-compatability reasons only.  Use 'if_source_generation_match' "
    "instead' to match source objects' generations."
)
_COMPOSE_IF_GENERATION_LIST_AND_IF_SOURCE_GENERATION_ERROR = (
    "Use 'if_generation_match' to match the generation of the destination "
    "object by passing in a generation number, instead of a list. "
    "Use 'if_source_generation_match' to match source objects generations."
)
_COMPOSE_IF_METAGENERATION_LIST_DEPRECATED = (
    "'if_metageneration_match: type list' is deprecated and supported for "
    "backwards-compatability reasons only. Note that the metageneration to "
    "be matched is that of the destination blob. Please pass in a single "
    "value (type long)."
)
_COMPOSE_IF_SOURCE_GENERATION_MISMATCH_ERROR = (
    "'if_source_generation_match' length must be the same as 'sources' length"
)
_DOWNLOAD_AS_STRING_DEPRECATED = (
    "Blob.download_as_string() is deprecated and will be removed in future. "
    "Use Blob.download_as_bytes() instead."
)


_DEFAULT_CHUNKSIZE = 104857600  # 1024 * 1024 B * 100 = 100 MB
_MAX_MULTIPART_SIZE = 8388608  # 8 MB

_logger = logging.getLogger(__name__)


[docs]class Blob(_PropertyMixin): """A wrapper around Cloud Storage's concept of an ``Object``. :type name: str :param name: The name of the blob. This corresponds to the unique path of the object in the bucket. If bytes, will be converted to a unicode object. Blob / object names can contain any sequence of valid unicode characters, of length 1-1024 bytes when UTF-8 encoded. :type bucket: :class:`google.cloud.storage.bucket.Bucket` :param bucket: The bucket to which this blob belongs. :type chunk_size: int :param chunk_size: (Optional) The size of a chunk of data whenever iterating (in bytes). This must be a multiple of 256 KB per the API specification. If not specified, the chunk_size of the blob itself is used. If that is not specified, a default value of 40 MB is used. :type encryption_key: bytes :param encryption_key: (Optional) 32 byte encryption key for customer-supplied encryption. See https://cloud.google.com/storage/docs/encryption#customer-supplied. :type kms_key_name: str :param kms_key_name: (Optional) Resource name of Cloud KMS key used to encrypt the blob's contents. :type generation: long :param generation: (Optional) If present, selects a specific revision of this object. """ _chunk_size = None # Default value for each instance. _CHUNK_SIZE_MULTIPLE = 256 * 1024 """Number (256 KB, in bytes) that must divide the chunk size.""" STORAGE_CLASSES = ( STANDARD_STORAGE_CLASS, NEARLINE_STORAGE_CLASS, COLDLINE_STORAGE_CLASS, ARCHIVE_STORAGE_CLASS, MULTI_REGIONAL_LEGACY_STORAGE_CLASS, REGIONAL_LEGACY_STORAGE_CLASS, ) """Allowed values for :attr:`storage_class`. See https://cloud.google.com/storage/docs/json_api/v1/objects#storageClass https://cloud.google.com/storage/docs/per-object-storage-class .. note:: This list does not include 'DURABLE_REDUCED_AVAILABILITY', which is only documented for buckets (and deprecated). """ def __init__( self, name, bucket, chunk_size=None, encryption_key=None, kms_key_name=None, generation=None, ): """ property :attr:`name` Get the blob's name. """ name = _bytes_to_unicode(name) super(Blob, self).__init__(name=name) self.chunk_size = chunk_size # Check that setter accepts value. self._bucket = bucket self._acl = ObjectACL(self) _raise_if_more_than_one_set( encryption_key=encryption_key, kms_key_name=kms_key_name ) self._encryption_key = encryption_key if kms_key_name is not None: self._properties["kmsKeyName"] = kms_key_name if generation is not None: self._properties["generation"] = generation @property def bucket(self): """Bucket which contains the object. :rtype: :class:`~google.cloud.storage.bucket.Bucket` :returns: The object's bucket. """ return self._bucket @property def chunk_size(self): """Get the blob's default chunk size. :rtype: int or ``NoneType`` :returns: The current blob's chunk size, if it is set. """ return self._chunk_size @chunk_size.setter def chunk_size(self, value): """Set the blob's default chunk size. :type value: int :param value: (Optional) The current blob's chunk size, if it is set. :raises: :class:`ValueError` if ``value`` is not ``None`` and is not a multiple of 256 KB. """ if value is not None and value > 0 and value % self._CHUNK_SIZE_MULTIPLE != 0: raise ValueError( "Chunk size must be a multiple of %d." % (self._CHUNK_SIZE_MULTIPLE,) ) self._chunk_size = value @property def encryption_key(self): """Retrieve the customer-supplied encryption key for the object. :rtype: bytes or ``NoneType`` :returns: The encryption key or ``None`` if no customer-supplied encryption key was used, or the blob's resource has not been loaded from the server. """ return self._encryption_key @encryption_key.setter def encryption_key(self, value): """Set the blob's encryption key. See https://cloud.google.com/storage/docs/encryption#customer-supplied To perform a key rotation for an encrypted blob, use :meth:`rewrite`. See https://cloud.google.com/storage/docs/encryption/using-customer-supplied-keys?hl=ca#rotating :type value: bytes :param value: 32 byte encryption key for customer-supplied encryption. """ self._encryption_key = value
[docs] @staticmethod def path_helper(bucket_path, blob_name): """Relative URL path for a blob. :type bucket_path: str :param bucket_path: The URL path for a bucket. :type blob_name: str :param blob_name: The name of the blob. :rtype: str :returns: The relative URL path for ``blob_name``. """ return bucket_path + "/o/" + _quote(blob_name)
@property def acl(self): """Create our ACL on demand.""" return self._acl def __repr__(self): if self.bucket: bucket_name = self.bucket.name else: bucket_name = None return "<Blob: %s, %s, %s>" % (bucket_name, self.name, self.generation) @property def path(self): """Getter property for the URL path to this Blob. :rtype: str :returns: The URL path to this Blob. """ if not self.name: raise ValueError("Cannot determine path without a blob name.") return self.path_helper(self.bucket.path, self.name) @property def client(self): """The client bound to this blob.""" return self.bucket.client @property def user_project(self): """Project ID billed for API requests made via this blob. Derived from bucket's value. :rtype: str """ return self.bucket.user_project def _encryption_headers(self): """Return any encryption headers needed to fetch the object. :rtype: List(Tuple(str, str)) :returns: a list of tuples to be passed as headers. """ return _get_encryption_headers(self._encryption_key) @property def _query_params(self): """Default query parameters.""" params = {} if self.generation is not None: params["generation"] = self.generation if self.user_project is not None: params["userProject"] = self.user_project return params @property def public_url(self): """The public URL for this blob. Use :meth:`make_public` to enable anonymous access via the returned URL. :rtype: `string` :returns: The public URL for this blob. """ return "{storage_base_url}/{bucket_name}/{quoted_name}".format( storage_base_url=_API_ACCESS_ENDPOINT, bucket_name=self.bucket.name, quoted_name=_quote(self.name, safe=b"/~"), )
[docs] @classmethod def from_string(cls, uri, client=None): """Get a constructor for blob object by URI. :type uri: str :param uri: The blob uri pass to get blob object. :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :rtype: :class:`google.cloud.storage.blob.Blob` :returns: The blob object created. Example: Get a constructor for blob object by URI. >>> from google.cloud import storage >>> from google.cloud.storage.blob import Blob >>> client = storage.Client() >>> blob = Blob.from_string("gs://bucket/object") """ from google.cloud.storage.bucket import Bucket scheme, netloc, path, query, frag = urlsplit(uri) if scheme != "gs": raise ValueError("URI scheme must be gs") bucket = Bucket(client, name=netloc) return cls(path[1:], bucket)
[docs] def generate_signed_url( self, expiration=None, api_access_endpoint=_API_ACCESS_ENDPOINT, method="GET", content_md5=None, content_type=None, response_disposition=None, response_type=None, generation=None, headers=None, query_parameters=None, client=None, credentials=None, version=None, service_account_email=None, access_token=None, virtual_hosted_style=False, bucket_bound_hostname=None, scheme="http", ): """Generates a signed URL for this blob. .. note:: If you are on Google Compute Engine, you can't generate a signed URL using GCE service account. Follow `Issue 50`_ for updates on this. If you'd like to be able to generate a signed URL from GCE, you can use a standard service account from a JSON file rather than a GCE service account. .. _Issue 50: https://github.com/GoogleCloudPlatform/\ google-auth-library-python/issues/50 If you have a blob that you want to allow access to for a set amount of time, you can use this method to generate a URL that is only valid within a certain time period. If ``bucket_bound_hostname`` is set as an argument of :attr:`api_access_endpoint`, ``https`` works only if using a ``CDN``. Example: Generates a signed URL for this blob using bucket_bound_hostname and scheme. >>> from google.cloud import storage >>> client = storage.Client() >>> bucket = client.get_bucket('my-bucket-name') >>> blob = bucket.get_blob('my-blob-name') >>> url = blob.generate_signed_url(expiration='url-expiration-time', bucket_bound_hostname='mydomain.tld', >>> version='v4') >>> url = blob.generate_signed_url(expiration='url-expiration-time', bucket_bound_hostname='mydomain.tld', >>> version='v4',scheme='https') # If using ``CDN`` This is particularly useful if you don't want publicly accessible blobs, but don't want to require users to explicitly log in. :type expiration: Union[Integer, datetime.datetime, datetime.timedelta] :param expiration: Point in time when the signed URL should expire. If a ``datetime`` instance is passed without an explicit ``tzinfo`` set, it will be assumed to be ``UTC``. :type api_access_endpoint: str :param api_access_endpoint: (Optional) URI base. :type method: str :param method: The HTTP verb that will be used when requesting the URL. :type content_md5: str :param content_md5: (Optional) The MD5 hash of the object referenced by ``resource``. :type content_type: str :param content_type: (Optional) The content type of the object referenced by ``resource``. :type response_disposition: str :param response_disposition: (Optional) Content disposition of responses to requests for the signed URL. For example, to enable the signed URL to initiate a file of ``blog.png``, use the value ``'attachment; filename=blob.png'``. :type response_type: str :param response_type: (Optional) Content type of responses to requests for the signed URL. Ignored if content_type is set on object/blob metadata. :type generation: str :param generation: (Optional) A value that indicates which generation of the resource to fetch. :type headers: dict :param headers: (Optional) Additional HTTP headers to be included as part of the signed URLs. See: https://cloud.google.com/storage/docs/xml-api/reference-headers Requests using the signed URL *must* pass the specified header (name and value) with each request for the URL. :type query_parameters: dict :param query_parameters: (Optional) Additional query parameters to be included as part of the signed URLs. See: https://cloud.google.com/storage/docs/xml-api/reference-headers#query :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :type credentials: :class:`google.auth.credentials.Credentials` :param credentials: (Optional) The authorization credentials to attach to requests. These credentials identify this application to the service. If none are specified, the client will attempt to ascertain the credentials from the environment. :type version: str :param version: (Optional) The version of signed credential to create. Must be one of 'v2' | 'v4'. :type service_account_email: str :param service_account_email: (Optional) E-mail address of the service account. :type access_token: str :param access_token: (Optional) Access token for a service account. :type virtual_hosted_style: bool :param virtual_hosted_style: (Optional) If true, then construct the URL relative the bucket's virtual hostname, e.g., '<bucket-name>.storage.googleapis.com'. :type bucket_bound_hostname: str :param bucket_bound_hostname: (Optional) If passed, then construct the URL relative to the bucket-bound hostname. Value can be a bare or with scheme, e.g., 'example.com' or 'http://example.com'. See: https://cloud.google.com/storage/docs/request-endpoints#cname :type scheme: str :param scheme: (Optional) If ``bucket_bound_hostname`` is passed as a bare hostname, use this value as the scheme. ``https`` will work only when using a CDN. Defaults to ``"http"``. :raises: :exc:`ValueError` when version is invalid. :raises: :exc:`TypeError` when expiration is not a valid type. :raises: :exc:`AttributeError` if credentials is not an instance of :class:`google.auth.credentials.Signing`. :rtype: str :returns: A signed URL you can use to access the resource until expiration. """ if version is None: version = "v2" elif version not in ("v2", "v4"): raise ValueError("'version' must be either 'v2' or 'v4'") quoted_name = _quote(self.name, safe=b"/~") if virtual_hosted_style: api_access_endpoint = "https://{bucket_name}.storage.googleapis.com".format( bucket_name=self.bucket.name ) elif bucket_bound_hostname: api_access_endpoint = _bucket_bound_hostname_url( bucket_bound_hostname, scheme ) else: resource = "/{bucket_name}/{quoted_name}".format( bucket_name=self.bucket.name, quoted_name=quoted_name ) if virtual_hosted_style or bucket_bound_hostname: resource = "/{quoted_name}".format(quoted_name=quoted_name) if credentials is None: client = self._require_client(client) credentials = client._credentials if version == "v2": helper = generate_signed_url_v2 else: helper = generate_signed_url_v4 if self._encryption_key is not None: encryption_headers = _get_encryption_headers(self._encryption_key) if headers is None: headers = {} if version == "v2": # See: https://cloud.google.com/storage/docs/access-control/signed-urls-v2#about-canonical-extension-headers v2_copy_only = "X-Goog-Encryption-Algorithm" headers[v2_copy_only] = encryption_headers[v2_copy_only] else: headers.update(encryption_headers) return helper( credentials, resource=resource, expiration=expiration, api_access_endpoint=api_access_endpoint, method=method.upper(), content_md5=content_md5, content_type=content_type, response_type=response_type, response_disposition=response_disposition, generation=generation, headers=headers, query_parameters=query_parameters, service_account_email=service_account_email, access_token=access_token, )
[docs] def exists( self, client=None, if_etag_match=None, if_etag_not_match=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, timeout=_DEFAULT_TIMEOUT, retry=DEFAULT_RETRY, ): """Determines whether or not this blob exists. If :attr:`user_project` is set on the bucket, bills the API request to that project. :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :type if_etag_match: Union[str, Set[str]] :param if_etag_match: (Optional) See :ref:`using-if-etag-match` :type if_etag_not_match: Union[str, Set[str]] :param if_etag_not_match: (Optional) See :ref:`using-if-etag-not-match` :type if_generation_match: long :param if_generation_match: (Optional) See :ref:`using-if-generation-match` :type if_generation_not_match: long :param if_generation_not_match: (Optional) See :ref:`using-if-generation-not-match` :type if_metageneration_match: long :param if_metageneration_match: (Optional) See :ref:`using-if-metageneration-match` :type if_metageneration_not_match: long :param if_metageneration_not_match: (Optional) See :ref:`using-if-metageneration-not-match` :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` :type retry: google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy :param retry: (Optional) How to retry the RPC. See: :ref:`configuring_retries` :rtype: bool :returns: True if the blob exists in Cloud Storage. """ client = self._require_client(client) # We only need the status code (200 or not) so we seek to # minimize the returned payload. query_params = self._query_params query_params["fields"] = "name" _add_generation_match_parameters( query_params, if_generation_match=if_generation_match, if_generation_not_match=if_generation_not_match, if_metageneration_match=if_metageneration_match, if_metageneration_not_match=if_metageneration_not_match, ) headers = {} _add_etag_match_headers( headers, if_etag_match=if_etag_match, if_etag_not_match=if_etag_not_match ) try: # We intentionally pass `_target_object=None` since fields=name # would limit the local properties. client._get_resource( self.path, query_params=query_params, headers=headers, timeout=timeout, retry=retry, _target_object=None, ) except NotFound: # NOTE: This will not fail immediately in a batch. However, when # Batch.finish() is called, the resulting `NotFound` will be # raised. return False return True
[docs] def delete( self, client=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, timeout=_DEFAULT_TIMEOUT, retry=DEFAULT_RETRY_IF_GENERATION_SPECIFIED, ): """Deletes a blob from Cloud Storage. If :attr:`user_project` is set on the bucket, bills the API request to that project. :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :type if_generation_match: long :param if_generation_match: (Optional) See :ref:`using-if-generation-match` :type if_generation_not_match: long :param if_generation_not_match: (Optional) See :ref:`using-if-generation-not-match` :type if_metageneration_match: long :param if_metageneration_match: (Optional) See :ref:`using-if-metageneration-match` :type if_metageneration_not_match: long :param if_metageneration_not_match: (Optional) See :ref:`using-if-metageneration-not-match` :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` :type retry: google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy :param retry: (Optional) How to retry the RPC. See: :ref:`configuring_retries` :raises: :class:`google.cloud.exceptions.NotFound` (propagated from :meth:`google.cloud.storage.bucket.Bucket.delete_blob`). """ self.bucket.delete_blob( self.name, client=client, generation=self.generation, timeout=timeout, if_generation_match=if_generation_match, if_generation_not_match=if_generation_not_match, if_metageneration_match=if_metageneration_match, if_metageneration_not_match=if_metageneration_not_match, retry=retry, )
def _get_transport(self, client): """Return the client's transport. :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :rtype transport: :class:`~google.auth.transport.requests.AuthorizedSession` :returns: The transport (with credentials) that will make authenticated requests. """ client = self._require_client(client) return client._http def _get_download_url( self, client, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, ): """Get the download URL for the current blob. If the ``media_link`` has been loaded, it will be used, otherwise the URL will be constructed from the current blob's path (and possibly generation) to avoid a round trip. :type client: :class:`~google.cloud.storage.client.Client` :param client: The client to use. :type if_generation_match: long :param if_generation_match: (Optional) See :ref:`using-if-generation-match` :type if_generation_not_match: long :param if_generation_not_match: (Optional) See :ref:`using-if-generation-not-match` :type if_metageneration_match: long :param if_metageneration_match: (Optional) See :ref:`using-if-metageneration-match` :type if_metageneration_not_match: long :param if_metageneration_not_match: (Optional) See :ref:`using-if-metageneration-not-match` :rtype: str :returns: The download URL for the current blob. """ name_value_pairs = [] if self.media_link is None: hostname = _get_host_name(client._connection) base_url = _DOWNLOAD_URL_TEMPLATE.format(hostname=hostname, path=self.path) if self.generation is not None: name_value_pairs.append(("generation", "{:d}".format(self.generation))) else: base_url = self.media_link if self.user_project is not None: name_value_pairs.append(("userProject", self.user_project)) _add_generation_match_parameters( name_value_pairs, if_generation_match=if_generation_match, if_generation_not_match=if_generation_not_match, if_metageneration_match=if_metageneration_match, if_metageneration_not_match=if_metageneration_not_match, ) return _add_query_parameters(base_url, name_value_pairs) def _extract_headers_from_download(self, response): """Extract headers from a non-chunked request's http object. This avoids the need to make a second request for commonly used headers. :type response: :class requests.models.Response :param response: The server response from downloading a non-chunked file """ self.content_encoding = response.headers.get("Content-Encoding", None) self.content_type = response.headers.get("Content-Type", None) self.cache_control = response.headers.get("Cache-Control", None) self.storage_class = response.headers.get("X-Goog-Storage-Class", None) self.content_language = response.headers.get("Content-Language", None) self._properties["etag"] = response.headers.get("ETag", None) self._properties["generation"] = response.headers.get("X-goog-generation", None) self._properties["metageneration"] = response.headers.get( "X-goog-metageneration", None ) # 'X-Goog-Hash': 'crc32c=4gcgLQ==,md5=CS9tHYTtyFntzj7B9nkkJQ==', x_goog_hash = response.headers.get("X-Goog-Hash", "") if x_goog_hash: digests = {} for encoded_digest in x_goog_hash.split(","): match = re.match(r"(crc32c|md5)=([\w\d/\+/]+={0,3})", encoded_digest) if match: method, digest = match.groups() digests[method] = digest self.crc32c = digests.get("crc32c", None) self.md5_hash = digests.get("md5", None) def _do_download( self, transport, file_obj, download_url, headers, start=None, end=None, raw_download=False, timeout=_DEFAULT_TIMEOUT, checksum="md5", retry=None, ): """Perform a download without any error handling. This is intended to be called by :meth:`download_to_file` so it can be wrapped with error handling / remapping. :type transport: :class:`~google.auth.transport.requests.AuthorizedSession` :param transport: The transport (with credentials) that will make authenticated requests. :type file_obj: file :param file_obj: A file handle to which to write the blob's data. :type download_url: str :param download_url: The URL where the media can be accessed. :type headers: dict :param headers: Headers to be sent with the request(s). :type start: int :param start: (Optional) The first byte in a range to be downloaded. :type end: int :param end: (Optional) The last byte in a range to be downloaded. :type raw_download: bool :param raw_download: (Optional) If true, download the object without any expansion. :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` :type checksum: str :param checksum: (Optional) The type of checksum to compute to verify the integrity of the object. The response headers must contain a checksum of the requested type. If the headers lack an appropriate checksum (for instance in the case of transcoded or ranged downloads where the remote service does not know the correct checksum, including downloads where chunk_size is set) an INFO-level log will be emitted. Supported values are "md5", "crc32c" and None. The default is "md5". :type retry: google.api_core.retry.Retry :param retry: (Optional) How to retry the RPC. A None value will disable retries. A google.api_core.retry.Retry value will enable retries, and the object will configure backoff and timeout options. Custom predicates (customizable error codes) are not supported for media operations such as this one. This private method does not accept ConditionalRetryPolicy values because the information necessary to evaluate the policy is instead evaluated in client.download_blob_to_file(). See the retry.py source code and docstrings in this package (google.cloud.storage.retry) for information on retry types and how to configure them. """ retry_strategy = _api_core_retry_to_resumable_media_retry(retry) if self.chunk_size is None: if raw_download: klass = RawDownload else: klass = Download download = klass( download_url, stream=file_obj, headers=headers, start=start, end=end, checksum=checksum, ) download._retry_strategy = retry_strategy response = download.consume(transport, timeout=timeout) self._extract_headers_from_download(response) else: if checksum: msg = _CHUNKED_DOWNLOAD_CHECKSUM_MESSAGE.format(checksum) _logger.info(msg) if raw_download: klass = RawChunkedDownload else: klass = ChunkedDownload download = klass( download_url, self.chunk_size, file_obj, headers=headers, start=start if start else 0, end=end, ) download._retry_strategy = retry_strategy while not download.finished: download.consume_next_chunk(transport, timeout=timeout)
[docs] def download_to_file( self, file_obj, client=None, start=None, end=None, raw_download=False, if_etag_match=None, if_etag_not_match=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, timeout=_DEFAULT_TIMEOUT, checksum="md5", retry=DEFAULT_RETRY, ): """DEPRECATED. Download the contents of this blob into a file-like object. .. note:: If the server-set property, :attr:`media_link`, is not yet initialized, makes an additional API request to load it. Downloading a file that has been encrypted with a `customer-supplied`_ encryption key: .. literalinclude:: snippets.py :start-after: [START download_to_file] :end-before: [END download_to_file] :dedent: 4 The ``encryption_key`` should be a str or bytes with a length of at least 32. If the :attr:`chunk_size` of a current blob is `None`, will download data in single download request otherwise it will download the :attr:`chunk_size` of data in each request. For more fine-grained control over the download process, check out `google-resumable-media`_. For example, this library allows downloading **parts** of a blob rather than the whole thing. If :attr:`user_project` is set on the bucket, bills the API request to that project. :type file_obj: file :param file_obj: A file handle to which to write the blob's data. :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :type start: int :param start: (Optional) The first byte in a range to be downloaded. :type end: int :param end: (Optional) The last byte in a range to be downloaded. :type raw_download: bool :param raw_download: (Optional) If true, download the object without any expansion. :type if_etag_match: Union[str, Set[str]] :param if_etag_match: (Optional) See :ref:`using-if-etag-match` :type if_etag_not_match: Union[str, Set[str]] :param if_etag_not_match: (Optional) See :ref:`using-if-etag-not-match` :type if_generation_match: long :param if_generation_match: (Optional) See :ref:`using-if-generation-match` :type if_generation_not_match: long :param if_generation_not_match: (Optional) See :ref:`using-if-generation-not-match` :type if_metageneration_match: long :param if_metageneration_match: (Optional) See :ref:`using-if-metageneration-match` :type if_metageneration_not_match: long :param if_metageneration_not_match: (Optional) See :ref:`using-if-metageneration-not-match` :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` :type checksum: str :param checksum: (Optional) The type of checksum to compute to verify the integrity of the object. The response headers must contain a checksum of the requested type. If the headers lack an appropriate checksum (for instance in the case of transcoded or ranged downloads where the remote service does not know the correct checksum, including downloads where chunk_size is set) an INFO-level log will be emitted. Supported values are "md5", "crc32c" and None. The default is "md5". :type retry: google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy :param retry: (Optional) How to retry the RPC. A None value will disable retries. A google.api_core.retry.Retry value will enable retries, and the object will define retriable response codes and errors and configure backoff and timeout options. A google.cloud.storage.retry.ConditionalRetryPolicy value wraps a Retry object and activates it only if certain conditions are met. This class exists to provide safe defaults for RPC calls that are not technically safe to retry normally (due to potential data duplication or other side-effects) but become safe to retry if a condition such as if_metageneration_match is set. See the retry.py source code and docstrings in this package (google.cloud.storage.retry) for information on retry types and how to configure them. Media operations (downloads and uploads) do not support non-default predicates in a Retry object. The default will always be used. Other configuration changes for Retry objects such as delays and deadlines are respected. :raises: :class:`google.cloud.exceptions.NotFound` """ client = self._require_client(client) client.download_blob_to_file( self, file_obj=file_obj, start=start, end=end, raw_download=raw_download, if_etag_match=if_etag_match, if_etag_not_match=if_etag_not_match, if_generation_match=if_generation_match, if_generation_not_match=if_generation_not_match, if_metageneration_match=if_metageneration_match, if_metageneration_not_match=if_metageneration_not_match, timeout=timeout, checksum=checksum, retry=retry, )
[docs] def download_to_filename( self, filename, client=None, start=None, end=None, raw_download=False, if_etag_match=None, if_etag_not_match=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, timeout=_DEFAULT_TIMEOUT, checksum="md5", retry=DEFAULT_RETRY, ): """Download the contents of this blob into a named file. If :attr:`user_project` is set on the bucket, bills the API request to that project. :type filename: str :param filename: A filename to be passed to ``open``. :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :type start: int :param start: (Optional) The first byte in a range to be downloaded. :type end: int :param end: (Optional) The last byte in a range to be downloaded. :type raw_download: bool :param raw_download: (Optional) If true, download the object without any expansion. :type if_etag_match: Union[str, Set[str]] :param if_etag_match: (Optional) See :ref:`using-if-etag-match` :type if_etag_not_match: Union[str, Set[str]] :param if_etag_not_match: (Optional) See :ref:`using-if-etag-not-match` :type if_generation_match: long :param if_generation_match: (Optional) See :ref:`using-if-generation-match` :type if_generation_not_match: long :param if_generation_not_match: (Optional) See :ref:`using-if-generation-not-match` :type if_metageneration_match: long :param if_metageneration_match: (Optional) See :ref:`using-if-metageneration-match` :type if_metageneration_not_match: long :param if_metageneration_not_match: (Optional) See :ref:`using-if-metageneration-not-match` :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` :type checksum: str :param checksum: (Optional) The type of checksum to compute to verify the integrity of the object. The response headers must contain a checksum of the requested type. If the headers lack an appropriate checksum (for instance in the case of transcoded or ranged downloads where the remote service does not know the correct checksum, including downloads where chunk_size is set) an INFO-level log will be emitted. Supported values are "md5", "crc32c" and None. The default is "md5". :type retry: google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy :param retry: (Optional) How to retry the RPC. A None value will disable retries. A google.api_core.retry.Retry value will enable retries, and the object will define retriable response codes and errors and configure backoff and timeout options. A google.cloud.storage.retry.ConditionalRetryPolicy value wraps a Retry object and activates it only if certain conditions are met. This class exists to provide safe defaults for RPC calls that are not technically safe to retry normally (due to potential data duplication or other side-effects) but become safe to retry if a condition such as if_metageneration_match is set. See the retry.py source code and docstrings in this package (google.cloud.storage.retry) for information on retry types and how to configure them. Media operations (downloads and uploads) do not support non-default predicates in a Retry object. The default will always be used. Other configuration changes for Retry objects such as delays and deadlines are respected. :raises: :class:`google.cloud.exceptions.NotFound` """ client = self._require_client(client) try: with open(filename, "wb") as file_obj: client.download_blob_to_file( self, file_obj, start=start, end=end, raw_download=raw_download, if_etag_match=if_etag_match, if_etag_not_match=if_etag_not_match, if_generation_match=if_generation_match, if_generation_not_match=if_generation_not_match, if_metageneration_match=if_metageneration_match, if_metageneration_not_match=if_metageneration_not_match, timeout=timeout, checksum=checksum, retry=retry, ) except resumable_media.DataCorruption: # Delete the corrupt downloaded file. os.remove(filename) raise updated = self.updated if updated is not None: if six.PY2: mtime = _convert_to_timestamp(updated) else: mtime = updated.timestamp() os.utime(file_obj.name, (mtime, mtime))
[docs] def download_as_bytes( self, client=None, start=None, end=None, raw_download=False, if_etag_match=None, if_etag_not_match=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, timeout=_DEFAULT_TIMEOUT, checksum="md5", retry=DEFAULT_RETRY, ): """Download the contents of this blob as a bytes object. If :attr:`user_project` is set on the bucket, bills the API request to that project. :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :type start: int :param start: (Optional) The first byte in a range to be downloaded. :type end: int :param end: (Optional) The last byte in a range to be downloaded. :type raw_download: bool :param raw_download: (Optional) If true, download the object without any expansion. :type if_etag_match: Union[str, Set[str]] :param if_etag_match: (Optional) See :ref:`using-if-etag-match` :type if_etag_not_match: Union[str, Set[str]] :param if_etag_not_match: (Optional) See :ref:`using-if-etag-not-match` :type if_generation_match: long :param if_generation_match: (Optional) See :ref:`using-if-generation-match` :type if_generation_not_match: long :param if_generation_not_match: (Optional) See :ref:`using-if-generation-not-match` :type if_metageneration_match: long :param if_metageneration_match: (Optional) See :ref:`using-if-metageneration-match` :type if_metageneration_not_match: long :param if_metageneration_not_match: (Optional) See :ref:`using-if-metageneration-not-match` :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` :type checksum: str :param checksum: (Optional) The type of checksum to compute to verify the integrity of the object. The response headers must contain a checksum of the requested type. If the headers lack an appropriate checksum (for instance in the case of transcoded or ranged downloads where the remote service does not know the correct checksum, including downloads where chunk_size is set) an INFO-level log will be emitted. Supported values are "md5", "crc32c" and None. The default is "md5". :type retry: google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy :param retry: (Optional) How to retry the RPC. A None value will disable retries. A google.api_core.retry.Retry value will enable retries, and the object will define retriable response codes and errors and configure backoff and timeout options. A google.cloud.storage.retry.ConditionalRetryPolicy value wraps a Retry object and activates it only if certain conditions are met. This class exists to provide safe defaults for RPC calls that are not technically safe to retry normally (due to potential data duplication or other side-effects) but become safe to retry if a condition such as if_metageneration_match is set. See the retry.py source code and docstrings in this package (google.cloud.storage.retry) for information on retry types and how to configure them. Media operations (downloads and uploads) do not support non-default predicates in a Retry object. The default will always be used. Other configuration changes for Retry objects such as delays and deadlines are respected. :rtype: bytes :returns: The data stored in this blob. :raises: :class:`google.cloud.exceptions.NotFound` """ client = self._require_client(client) string_buffer = BytesIO() client.download_blob_to_file( self, string_buffer, start=start, end=end, raw_download=raw_download, if_etag_match=if_etag_match, if_etag_not_match=if_etag_not_match, if_generation_match=if_generation_match, if_generation_not_match=if_generation_not_match, if_metageneration_match=if_metageneration_match, if_metageneration_not_match=if_metageneration_not_match, timeout=timeout, checksum=checksum, retry=retry, ) return string_buffer.getvalue()
[docs] def download_as_string( self, client=None, start=None, end=None, raw_download=False, if_etag_match=None, if_etag_not_match=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, timeout=_DEFAULT_TIMEOUT, retry=DEFAULT_RETRY, ): """(Deprecated) Download the contents of this blob as a bytes object. If :attr:`user_project` is set on the bucket, bills the API request to that project. .. note:: Deprecated alias for :meth:`download_as_bytes`. :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :type start: int :param start: (Optional) The first byte in a range to be downloaded. :type end: int :param end: (Optional) The last byte in a range to be downloaded. :type raw_download: bool :param raw_download: (Optional) If true, download the object without any expansion. :type if_etag_match: Union[str, Set[str]] :param if_etag_match: (Optional) See :ref:`using-if-etag-match` :type if_etag_not_match: Union[str, Set[str]] :param if_etag_not_match: (Optional) See :ref:`using-if-etag-not-match` :type if_generation_match: long :param if_generation_match: (Optional) See :ref:`using-if-generation-match` :type if_generation_not_match: long :param if_generation_not_match: (Optional) See :ref:`using-if-generation-not-match` :type if_metageneration_match: long :param if_metageneration_match: (Optional) See :ref:`using-if-metageneration-match` :type if_metageneration_not_match: long :param if_metageneration_not_match: (Optional) See :ref:`using-if-metageneration-not-match` :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` :type retry: google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy :param retry: (Optional) How to retry the RPC. A None value will disable retries. A google.api_core.retry.Retry value will enable retries, and the object will define retriable response codes and errors and configure backoff and timeout options. A google.cloud.storage.retry.ConditionalRetryPolicy value wraps a Retry object and activates it only if certain conditions are met. This class exists to provide safe defaults for RPC calls that are not technically safe to retry normally (due to potential data duplication or other side-effects) but become safe to retry if a condition such as if_metageneration_match is set. See the retry.py source code and docstrings in this package (google.cloud.storage.retry) for information on retry types and how to configure them. Media operations (downloads and uploads) do not support non-default predicates in a Retry object. The default will always be used. Other configuration changes for Retry objects such as delays and deadlines are respected. :rtype: bytes :returns: The data stored in this blob. :raises: :class:`google.cloud.exceptions.NotFound` """ warnings.warn( _DOWNLOAD_AS_STRING_DEPRECATED, PendingDeprecationWarning, stacklevel=2 ) return self.download_as_bytes( client=client, start=start, end=end, raw_download=raw_download, if_etag_match=if_etag_match, if_etag_not_match=if_etag_not_match, if_generation_match=if_generation_match, if_generation_not_match=if_generation_not_match, if_metageneration_match=if_metageneration_match, if_metageneration_not_match=if_metageneration_not_match, timeout=timeout, retry=retry, )
[docs] def download_as_text( self, client=None, start=None, end=None, raw_download=False, encoding=None, if_etag_match=None, if_etag_not_match=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, timeout=_DEFAULT_TIMEOUT, retry=DEFAULT_RETRY, ): """Download the contents of this blob as text (*not* bytes). If :attr:`user_project` is set on the bucket, bills the API request to that project. :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :type start: int :param start: (Optional) The first byte in a range to be downloaded. :type end: int :param end: (Optional) The last byte in a range to be downloaded. :type raw_download: bool :param raw_download: (Optional) If true, download the object without any expansion. :type encoding: str :param encoding: (Optional) encoding to be used to decode the downloaded bytes. Defaults to the ``charset`` param of attr:`content_type`, or else to "utf-8". :type if_etag_match: Union[str, Set[str]] :param if_etag_match: (Optional) See :ref:`using-if-etag-match` :type if_etag_not_match: Union[str, Set[str]] :param if_etag_not_match: (Optional) See :ref:`using-if-etag-not-match` :type if_generation_match: long :param if_generation_match: (Optional) See :ref:`using-if-generation-match` :type if_generation_not_match: long :param if_generation_not_match: (Optional) See :ref:`using-if-generation-not-match` :type if_metageneration_match: long :param if_metageneration_match: (Optional) See :ref:`using-if-metageneration-match` :type if_metageneration_not_match: long :param if_metageneration_not_match: (Optional) See :ref:`using-if-metageneration-not-match` :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` :type retry: google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy :param retry: (Optional) How to retry the RPC. A None value will disable retries. A google.api_core.retry.Retry value will enable retries, and the object will define retriable response codes and errors and configure backoff and timeout options. A google.cloud.storage.retry.ConditionalRetryPolicy value wraps a Retry object and activates it only if certain conditions are met. This class exists to provide safe defaults for RPC calls that are not technically safe to retry normally (due to potential data duplication or other side-effects) but become safe to retry if a condition such as if_metageneration_match is set. See the retry.py source code and docstrings in this package (google.cloud.storage.retry) for information on retry types and how to configure them. Media operations (downloads and uploads) do not support non-default predicates in a Retry object. The default will always be used. Other configuration changes for Retry objects such as delays and deadlines are respected. :rtype: text :returns: The data stored in this blob, decoded to text. """ data = self.download_as_bytes( client=client, start=start, end=end, raw_download=raw_download, if_etag_match=if_etag_match, if_etag_not_match=if_etag_not_match, if_generation_match=if_generation_match, if_generation_not_match=if_generation_not_match, if_metageneration_match=if_metageneration_match, if_metageneration_not_match=if_metageneration_not_match, timeout=timeout, retry=retry, ) if encoding is not None: return data.decode(encoding) if self.content_type is not None: _, params = cgi.parse_header(self.content_type) if "charset" in params: return data.decode(params["charset"]) return data.decode("utf-8")
def _get_content_type(self, content_type, filename=None): """Determine the content type from the current object. The return value will be determined in order of precedence: - The value passed in to this method (if not :data:`None`) - The value stored on the current blob - The default value ('application/octet-stream') :type content_type: str :param content_type: (Optional) Type of content. :type filename: str :param filename: (Optional) The name of the file where the content is stored. :rtype: str :returns: Type of content gathered from the object. """ if content_type is None: content_type = self.content_type if content_type is None and filename is not None: content_type, _ = mimetypes.guess_type(filename) if content_type is None: content_type = _DEFAULT_CONTENT_TYPE return content_type def _get_writable_metadata(self): """Get the object / blob metadata which is writable. This is intended to be used when creating a new object / blob. See the `API reference docs`_ for more information, the fields marked as writable are: * ``acl`` * ``cacheControl`` * ``contentDisposition`` * ``contentEncoding`` * ``contentLanguage`` * ``contentType`` * ``crc32c`` * ``customTime`` * ``md5Hash`` * ``metadata`` * ``name`` * ``storageClass`` For now, we don't support ``acl``, access control lists should be managed directly through :class:`ObjectACL` methods. """ # NOTE: This assumes `self.name` is unicode. object_metadata = {"name": self.name} for key in self._changes: if key in _WRITABLE_FIELDS: object_metadata[key] = self._properties[key] return object_metadata def _get_upload_arguments(self, content_type): """Get required arguments for performing an upload. The content type returned will be determined in order of precedence: - The value passed in to this method (if not :data:`None`) - The value stored on the current blob - The default value ('application/octet-stream') :type content_type: str :param content_type: Type of content being uploaded (or :data:`None`). :rtype: tuple :returns: A triple of * A header dictionary * An object metadata dictionary * The ``content_type`` as a string (according to precedence) """ headers = _get_encryption_headers(self._encryption_key) object_metadata = self._get_writable_metadata() content_type = self._get_content_type(content_type) return headers, object_metadata, content_type def _do_multipart_upload( self, client, stream, content_type, size, num_retries, predefined_acl, if_generation_match, if_generation_not_match, if_metageneration_match, if_metageneration_not_match, timeout=_DEFAULT_TIMEOUT, checksum=None, retry=None, ): """Perform a multipart upload. The content type of the upload will be determined in order of precedence: - The value passed in to this method (if not :data:`None`) - The value stored on the current blob - The default value ('application/octet-stream') :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :type stream: IO[bytes] :param stream: A bytes IO object open for reading. :type content_type: str :param content_type: Type of content being uploaded (or :data:`None`). :type size: int :param size: The number of bytes to be uploaded (which will be read from ``stream``). If not provided, the upload will be concluded once ``stream`` is exhausted (or :data:`None`). :type num_retries: int :param num_retries: Number of upload retries. By default, only uploads with if_generation_match set will be retried, as uploads without the argument are not guaranteed to be idempotent. Setting num_retries will override this default behavior and guarantee retries even when if_generation_match is not set. (Deprecated: This argument will be removed in a future release.) :type predefined_acl: str :param predefined_acl: (Optional) Predefined access control list :type if_generation_match: long :param if_generation_match: (Optional) See :ref:`using-if-generation-match` :type if_generation_not_match: long :param if_generation_not_match: (Optional) See :ref:`using-if-generation-not-match` :type if_metageneration_match: long :param if_metageneration_match: (Optional) See :ref:`using-if-metageneration-match` :type if_metageneration_not_match: long :param if_metageneration_not_match: (Optional) See :ref:`using-if-metageneration-not-match` :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` :type checksum: str :param checksum: (Optional) The type of checksum to compute to verify the integrity of the object. The request metadata will be amended to include the computed value. Using this option will override a manually-set checksum value. Supported values are "md5", "crc32c" and None. The default is None. :type retry: google.api_core.retry.Retry :param retry: (Optional) How to retry the RPC. A None value will disable retries. A google.api_core.retry.Retry value will enable retries, and the object will configure backoff and timeout options. Custom predicates (customizable error codes) are not supported for media operations such as this one. This private method does not accept ConditionalRetryPolicy values because the information necessary to evaluate the policy is instead evaluated in blob._do_upload(). See the retry.py source code and docstrings in this package (google.cloud.storage.retry) for information on retry types and how to configure them. :rtype: :class:`~requests.Response` :returns: The "200 OK" response object returned after the multipart upload request. :raises: :exc:`ValueError` if ``size`` is not :data:`None` but the ``stream`` has fewer than ``size`` bytes remaining. """ if size is None: data = stream.read() else: data = stream.read(size) if len(data) < size: msg = _READ_LESS_THAN_SIZE.format(size, len(data)) raise ValueError(msg) client = self._require_client(client) transport = self._get_transport(client) if "metadata" in self._properties and "metadata" not in self._changes: self._changes.add("metadata") info = self._get_upload_arguments(content_type) headers, object_metadata, content_type = info hostname = _get_host_name(client._connection) base_url = _MULTIPART_URL_TEMPLATE.format( hostname=hostname, bucket_path=self.bucket.path ) name_value_pairs = [] if self.user_project is not None: name_value_pairs.append(("userProject", self.user_project)) # When a Customer Managed Encryption Key is used to encrypt Cloud Storage object # at rest, object resource metadata will store the version of the Key Management # Service cryptographic material. If a Blob instance with KMS Key metadata set is # used to upload a new version of the object then the existing kmsKeyName version # value can't be used in the upload request and the client instead ignores it. if ( self.kms_key_name is not None and "cryptoKeyVersions" not in self.kms_key_name ): name_value_pairs.append(("kmsKeyName", self.kms_key_name)) if predefined_acl is not None: name_value_pairs.append(("predefinedAcl", predefined_acl)) if if_generation_match is not None: name_value_pairs.append(("ifGenerationMatch", if_generation_match)) if if_generation_not_match is not None: name_value_pairs.append(("ifGenerationNotMatch", if_generation_not_match)) if if_metageneration_match is not None: name_value_pairs.append(("ifMetagenerationMatch", if_metageneration_match)) if if_metageneration_not_match is not None: name_value_pairs.append( ("ifMetaGenerationNotMatch", if_metageneration_not_match) ) upload_url = _add_query_parameters(base_url, name_value_pairs) upload = MultipartUpload(upload_url, headers=headers, checksum=checksum) upload._retry_strategy = _api_core_retry_to_resumable_media_retry( retry, num_retries ) response = upload.transmit( transport, data, object_metadata, content_type, timeout=timeout ) return response def _initiate_resumable_upload( self, client, stream, content_type, size, num_retries, predefined_acl=None, extra_headers=None, chunk_size=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, timeout=_DEFAULT_TIMEOUT, checksum=None, retry=None, ): """Initiate a resumable upload. The content type of the upload will be determined in order of precedence: - The value passed in to this method (if not :data:`None`) - The value stored on the current blob - The default value ('application/octet-stream') :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :type stream: IO[bytes] :param stream: A bytes IO object open for reading. :type content_type: str :param content_type: Type of content being uploaded (or :data:`None`). :type size: int :param size: The number of bytes to be uploaded (which will be read from ``stream``). If not provided, the upload will be concluded once ``stream`` is exhausted (or :data:`None`). :type predefined_acl: str :param predefined_acl: (Optional) Predefined access control list :type num_retries: int :param num_retries: Number of upload retries. By default, only uploads with if_generation_match set will be retried, as uploads without the argument are not guaranteed to be idempotent. Setting num_retries will override this default behavior and guarantee retries even when if_generation_match is not set. (Deprecated: This argument will be removed in a future release.) :type extra_headers: dict :param extra_headers: (Optional) Extra headers to add to standard headers. :type chunk_size: int :param chunk_size: (Optional) Chunk size to use when creating a :class:`~google.resumable_media.requests.ResumableUpload`. If not passed, will fall back to the chunk size on the current blob, if the chunk size of a current blob is also `None`, will set the default value. The default value of ``chunk_size`` is 100 MB. :type if_generation_match: long :param if_generation_match: (Optional) See :ref:`using-if-generation-match` :type if_generation_not_match: long :param if_generation_not_match: (Optional) See :ref:`using-if-generation-not-match` :type if_metageneration_match: long :param if_metageneration_match: (Optional) See :ref:`using-if-metageneration-match` :type if_metageneration_not_match: long :param if_metageneration_not_match: (Optional) See :ref:`using-if-metageneration-not-match` :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` :type checksum: str :param checksum: (Optional) The type of checksum to compute to verify the integrity of the object. After the upload is complete, the server-computed checksum of the resulting object will be checked and google.resumable_media.common.DataCorruption will be raised on a mismatch. On a validation failure, the client will attempt to delete the uploaded object automatically. Supported values are "md5", "crc32c" and None. The default is None. :type retry: google.api_core.retry.Retry :param retry: (Optional) How to retry the RPC. A None value will disable retries. A google.api_core.retry.Retry value will enable retries, and the object will configure backoff and timeout options. Custom predicates (customizable error codes) are not supported for media operations such as this one. This private method does not accept ConditionalRetryPolicy values because the information necessary to evaluate the policy is instead evaluated in blob._do_upload(). See the retry.py source code and docstrings in this package (google.cloud.storage.retry) for information on retry types and how to configure them. :rtype: tuple :returns: Pair of * The :class:`~google.resumable_media.requests.ResumableUpload` that was created * The ``transport`` used to initiate the upload. """ client = self._require_client(client) if chunk_size is None: chunk_size = self.chunk_size if chunk_size is None: chunk_size = _DEFAULT_CHUNKSIZE transport = self._get_transport(client) if "metadata" in self._properties and "metadata" not in self._changes: self._changes.add("metadata") info = self._get_upload_arguments(content_type) headers, object_metadata, content_type = info if extra_headers is not None: headers.update(extra_headers) hostname = _get_host_name(client._connection) base_url = _RESUMABLE_URL_TEMPLATE.format( hostname=hostname, bucket_path=self.bucket.path ) name_value_pairs = [] if self.user_project is not None: name_value_pairs.append(("userProject", self.user_project)) # When a Customer Managed Encryption Key is used to encrypt Cloud Storage object # at rest, object resource metadata will store the version of the Key Management # Service cryptographic material. If a Blob instance with KMS Key metadata set is # used to upload a new version of the object then the existing kmsKeyName version # value can't be used in the upload request and the client instead ignores it. if ( self.kms_key_name is not None and "cryptoKeyVersions" not in self.kms_key_name ): name_value_pairs.append(("kmsKeyName", self.kms_key_name)) if predefined_acl is not None: name_value_pairs.append(("predefinedAcl", predefined_acl)) if if_generation_match is not None: name_value_pairs.append(("ifGenerationMatch", if_generation_match)) if if_generation_not_match is not None: name_value_pairs.append(("ifGenerationNotMatch", if_generation_not_match)) if if_metageneration_match is not None: name_value_pairs.append(("ifMetagenerationMatch", if_metageneration_match)) if if_metageneration_not_match is not None: name_value_pairs.append( ("ifMetaGenerationNotMatch", if_metageneration_not_match) ) upload_url = _add_query_parameters(base_url, name_value_pairs) upload = ResumableUpload( upload_url, chunk_size, headers=headers, checksum=checksum ) upload._retry_strategy = _api_core_retry_to_resumable_media_retry( retry, num_retries ) upload.initiate( transport, stream, object_metadata, content_type, total_bytes=size, stream_final=False, timeout=timeout, ) return upload, transport def _do_resumable_upload( self, client, stream, content_type, size, num_retries, predefined_acl, if_generation_match, if_generation_not_match, if_metageneration_match, if_metageneration_not_match, timeout=_DEFAULT_TIMEOUT, checksum=None, retry=None, ): """Perform a resumable upload. Assumes ``chunk_size`` is not :data:`None` on the current blob. The default value of ``chunk_size`` is 100 MB. The content type of the upload will be determined in order of precedence: - The value passed in to this method (if not :data:`None`) - The value stored on the current blob - The default value ('application/octet-stream') :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :type stream: IO[bytes] :param stream: A bytes IO object open for reading. :type content_type: str :param content_type: Type of content being uploaded (or :data:`None`). :type size: int :param size: The number of bytes to be uploaded (which will be read from ``stream``). If not provided, the upload will be concluded once ``stream`` is exhausted (or :data:`None`). :type num_retries: int :param num_retries: Number of upload retries. By default, only uploads with if_generation_match set will be retried, as uploads without the argument are not guaranteed to be idempotent. Setting num_retries will override this default behavior and guarantee retries even when if_generation_match is not set. (Deprecated: This argument will be removed in a future release.) :type predefined_acl: str :param predefined_acl: (Optional) Predefined access control list :type if_generation_match: long :param if_generation_match: (Optional) See :ref:`using-if-generation-match` :type if_generation_not_match: long :param if_generation_not_match: (Optional) See :ref:`using-if-generation-not-match` :type if_metageneration_match: long :param if_metageneration_match: (Optional) See :ref:`using-if-metageneration-match` :type if_metageneration_not_match: long :param if_metageneration_not_match: (Optional) See :ref:`using-if-metageneration-not-match` :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` :type checksum: str :param checksum: (Optional) The type of checksum to compute to verify the integrity of the object. After the upload is complete, the server-computed checksum of the resulting object will be checked and google.resumable_media.common.DataCorruption will be raised on a mismatch. On a validation failure, the client will attempt to delete the uploaded object automatically. Supported values are "md5", "crc32c" and None. The default is None. :type retry: google.api_core.retry.Retry :param retry: (Optional) How to retry the RPC. A None value will disable retries. A google.api_core.retry.Retry value will enable retries, and the object will configure backoff and timeout options. Custom predicates (customizable error codes) are not supported for media operations such as this one. This private method does not accept ConditionalRetryPolicy values because the information necessary to evaluate the policy is instead evaluated in blob._do_upload(). See the retry.py source code and docstrings in this package (google.cloud.storage.retry) for information on retry types and how to configure them. :rtype: :class:`~requests.Response` :returns: The "200 OK" response object returned after the final chunk is uploaded. """ upload, transport = self._initiate_resumable_upload( client, stream, content_type, size, num_retries, predefined_acl=predefined_acl, if_generation_match=if_generation_match, if_generation_not_match=if_generation_not_match, if_metageneration_match=if_metageneration_match, if_metageneration_not_match=if_metageneration_not_match, timeout=timeout, checksum=checksum, retry=retry, ) while not upload.finished: try: response = upload.transmit_next_chunk(transport, timeout=timeout) except resumable_media.DataCorruption: # Attempt to delete the corrupted object. self.delete() raise return response def _do_upload( self, client, stream, content_type, size, num_retries, predefined_acl, if_generation_match, if_generation_not_match, if_metageneration_match, if_metageneration_not_match, timeout=_DEFAULT_TIMEOUT, checksum=None, retry=None, ): """Determine an upload strategy and then perform the upload. If the size of the data to be uploaded exceeds 8 MB a resumable media request will be used, otherwise the content and the metadata will be uploaded in a single multipart upload request. The content type of the upload will be determined in order of precedence: - The value passed in to this method (if not :data:`None`) - The value stored on the current blob - The default value ('application/octet-stream') :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :type stream: IO[bytes] :param stream: A bytes IO object open for reading. :type content_type: str :param content_type: Type of content being uploaded (or :data:`None`). :type size: int :param size: The number of bytes to be uploaded (which will be read from ``stream``). If not provided, the upload will be concluded once ``stream`` is exhausted (or :data:`None`). :type num_retries: int :param num_retries: Number of upload retries. By default, only uploads with if_generation_match set will be retried, as uploads without the argument are not guaranteed to be idempotent. Setting num_retries will override this default behavior and guarantee retries even when if_generation_match is not set. (Deprecated: This argument will be removed in a future release.) :type predefined_acl: str :param predefined_acl: (Optional) Predefined access control list :type if_generation_match: long :param if_generation_match: (Optional) See :ref:`using-if-generation-match` :type if_generation_not_match: long :param if_generation_not_match: (Optional) See :ref:`using-if-generation-not-match` :type if_metageneration_match: long :param if_metageneration_match: (Optional) See :ref:`using-if-metageneration-match` :type if_metageneration_not_match: long :param if_metageneration_not_match: (Optional) See :ref:`using-if-metageneration-not-match` :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` :type checksum: str :param checksum: (Optional) The type of checksum to compute to verify the integrity of the object. If the upload is completed in a single request, the checksum will be entirely precomputed and the remote server will handle verification and error handling. If the upload is too large and must be transmitted in multiple requests, the checksum will be incrementally computed and the client will handle verification and error handling, raising google.resumable_media.common.DataCorruption on a mismatch and attempting to delete the corrupted file. Supported values are "md5", "crc32c" and None. The default is None. :type retry: google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy :param retry: (Optional) How to retry the RPC. A None value will disable retries. A google.api_core.retry.Retry value will enable retries, and the object will define retriable response codes and errors and configure backoff and timeout options. A google.cloud.storage.retry.ConditionalRetryPolicy value wraps a Retry object and activates it only if certain conditions are met. This class exists to provide safe defaults for RPC calls that are not technically safe to retry normally (due to potential data duplication or other side-effects) but become safe to retry if a condition such as if_generation_match is set. See the retry.py source code and docstrings in this package (google.cloud.storage.retry) for information on retry types and how to configure them. Media operations (downloads and uploads) do not support non-default predicates in a Retry object. The default will always be used. Other configuration changes for Retry objects such as delays and deadlines are respected. :rtype: dict :returns: The parsed JSON from the "200 OK" response. This will be the **only** response in the multipart case and it will be the **final** response in the resumable case. """ # Handle ConditionalRetryPolicy. if isinstance(retry, ConditionalRetryPolicy): # Conditional retries are designed for non-media calls, which change # arguments into query_params dictionaries. Media operations work # differently, so here we make a "fake" query_params to feed to the # ConditionalRetryPolicy. query_params = { "ifGenerationMatch": if_generation_match, "ifMetagenerationMatch": if_metageneration_match, } retry = retry.get_retry_policy_if_conditions_met(query_params=query_params) if size is not None and size <= _MAX_MULTIPART_SIZE: response = self._do_multipart_upload( client, stream, content_type, size, num_retries, predefined_acl, if_generation_match, if_generation_not_match, if_metageneration_match, if_metageneration_not_match, timeout=timeout, checksum=checksum, retry=retry, ) else: response = self._do_resumable_upload( client, stream, content_type, size, num_retries, predefined_acl, if_generation_match, if_generation_not_match, if_metageneration_match, if_metageneration_not_match, timeout=timeout, checksum=checksum, retry=retry, ) return response.json()
[docs] def upload_from_file( self, file_obj, rewind=False, size=None, content_type=None, num_retries=None, client=None, predefined_acl=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, timeout=_DEFAULT_TIMEOUT, checksum=None, retry=DEFAULT_RETRY_IF_GENERATION_SPECIFIED, ): """Upload the contents of this blob from a file-like object. The content type of the upload will be determined in order of precedence: - The value passed in to this method (if not :data:`None`) - The value stored on the current blob - The default value ('application/octet-stream') .. note:: The effect of uploading to an existing blob depends on the "versioning" and "lifecycle" policies defined on the blob's bucket. In the absence of those policies, upload will overwrite any existing contents. See the `object versioning`_ and `lifecycle`_ API documents for details. Uploading a file with a `customer-supplied`_ encryption key: .. literalinclude:: snippets.py :start-after: [START upload_from_file] :end-before: [END upload_from_file] :dedent: 4 The ``encryption_key`` should be a str or bytes with a length of at least 32. If the size of the data to be uploaded exceeds 8 MB a resumable media request will be used, otherwise the content and the metadata will be uploaded in a single multipart upload request. For more fine-grained over the upload process, check out `google-resumable-media`_. If :attr:`user_project` is set on the bucket, bills the API request to that project. :type file_obj: file :param file_obj: A file handle open for reading. :type rewind: bool :param rewind: If True, seek to the beginning of the file handle before writing the file to Cloud Storage. :type size: int :param size: The number of bytes to be uploaded (which will be read from ``file_obj``). If not provided, the upload will be concluded once ``file_obj`` is exhausted. :type content_type: str :param content_type: (Optional) Type of content being uploaded. :type num_retries: int :param num_retries: Number of upload retries. By default, only uploads with if_generation_match set will be retried, as uploads without the argument are not guaranteed to be idempotent. Setting num_retries will override this default behavior and guarantee retries even when if_generation_match is not set. (Deprecated: This argument will be removed in a future release.) :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :type predefined_acl: str :param predefined_acl: (Optional) Predefined access control list :type if_generation_match: long :param if_generation_match: (Optional) See :ref:`using-if-generation-match` :type if_generation_not_match: long :param if_generation_not_match: (Optional) See :ref:`using-if-generation-not-match` :type if_metageneration_match: long :param if_metageneration_match: (Optional) See :ref:`using-if-metageneration-match` :type if_metageneration_not_match: long :param if_metageneration_not_match: (Optional) See :ref:`using-if-metageneration-not-match` :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` :type checksum: str :param checksum: (Optional) The type of checksum to compute to verify the integrity of the object. If the upload is completed in a single request, the checksum will be entirely precomputed and the remote server will handle verification and error handling. If the upload is too large and must be transmitted in multiple requests, the checksum will be incrementally computed and the client will handle verification and error handling, raising google.resumable_media.common.DataCorruption on a mismatch and attempting to delete the corrupted file. Supported values are "md5", "crc32c" and None. The default is None. :type retry: google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy :param retry: (Optional) How to retry the RPC. A None value will disable retries. A google.api_core.retry.Retry value will enable retries, and the object will define retriable response codes and errors and configure backoff and timeout options. A google.cloud.storage.retry.ConditionalRetryPolicy value wraps a Retry object and activates it only if certain conditions are met. This class exists to provide safe defaults for RPC calls that are not technically safe to retry normally (due to potential data duplication or other side-effects) but become safe to retry if a condition such as if_generation_match is set. See the retry.py source code and docstrings in this package (google.cloud.storage.retry) for information on retry types and how to configure them. Media operations (downloads and uploads) do not support non-default predicates in a Retry object. The default will always be used. Other configuration changes for Retry objects such as delays and deadlines are respected. :raises: :class:`~google.cloud.exceptions.GoogleCloudError` if the upload response returns an error status. .. _object versioning: https://cloud.google.com/storage/\ docs/object-versioning .. _lifecycle: https://cloud.google.com/storage/docs/lifecycle """ if num_retries is not None: warnings.warn(_NUM_RETRIES_MESSAGE, DeprecationWarning, stacklevel=2) # num_retries and retry are mutually exclusive. If num_retries is # set and retry is exactly the default, then nullify retry for # backwards compatibility. if retry is DEFAULT_RETRY_IF_GENERATION_SPECIFIED: retry = None _maybe_rewind(file_obj, rewind=rewind) predefined_acl = ACL.validate_predefined(predefined_acl) try: created_json = self._do_upload( client, file_obj, content_type, size, num_retries, predefined_acl, if_generation_match, if_generation_not_match, if_metageneration_match, if_metageneration_not_match, timeout=timeout, checksum=checksum, retry=retry, ) self._set_properties(created_json) except resumable_media.InvalidResponse as exc: _raise_from_invalid_response(exc)
[docs] def upload_from_filename( self, filename, content_type=None, num_retries=None, client=None, predefined_acl=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, timeout=_DEFAULT_TIMEOUT, checksum=None, retry=DEFAULT_RETRY_IF_GENERATION_SPECIFIED, ): """Upload this blob's contents from the content of a named file. The content type of the upload will be determined in order of precedence: - The value passed in to this method (if not :data:`None`) - The value stored on the current blob - The value given by ``mimetypes.guess_type`` - The default value ('application/octet-stream') .. note:: The effect of uploading to an existing blob depends on the "versioning" and "lifecycle" policies defined on the blob's bucket. In the absence of those policies, upload will overwrite any existing contents. See the `object versioning <https://cloud.google.com/storage/docs/object-versioning>`_ and `lifecycle <https://cloud.google.com/storage/docs/lifecycle>`_ API documents for details. If :attr:`user_project` is set on the bucket, bills the API request to that project. :type filename: str :param filename: The path to the file. :type content_type: str :param content_type: (Optional) Type of content being uploaded. :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :type num_retries: int :param num_retries: Number of upload retries. By default, only uploads with if_generation_match set will be retried, as uploads without the argument are not guaranteed to be idempotent. Setting num_retries will override this default behavior and guarantee retries even when if_generation_match is not set. (Deprecated: This argument will be removed in a future release.) :type predefined_acl: str :param predefined_acl: (Optional) Predefined access control list :type if_generation_match: long :param if_generation_match: (Optional) See :ref:`using-if-generation-match` :type if_generation_not_match: long :param if_generation_not_match: (Optional) See :ref:`using-if-generation-not-match` :type if_metageneration_match: long :param if_metageneration_match: (Optional) See :ref:`using-if-metageneration-match` :type if_metageneration_not_match: long :param if_metageneration_not_match: (Optional) See :ref:`using-if-metageneration-not-match` :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` :type checksum: str :param checksum: (Optional) The type of checksum to compute to verify the integrity of the object. If the upload is completed in a single request, the checksum will be entirely precomputed and the remote server will handle verification and error handling. If the upload is too large and must be transmitted in multiple requests, the checksum will be incrementally computed and the client will handle verification and error handling, raising google.resumable_media.common.DataCorruption on a mismatch and attempting to delete the corrupted file. Supported values are "md5", "crc32c" and None. The default is None. :type retry: google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy :param retry: (Optional) How to retry the RPC. A None value will disable retries. A google.api_core.retry.Retry value will enable retries, and the object will define retriable response codes and errors and configure backoff and timeout options. A google.cloud.storage.retry.ConditionalRetryPolicy value wraps a Retry object and activates it only if certain conditions are met. This class exists to provide safe defaults for RPC calls that are not technically safe to retry normally (due to potential data duplication or other side-effects) but become safe to retry if a condition such as if_generation_match is set. See the retry.py source code and docstrings in this package (google.cloud.storage.retry) for information on retry types and how to configure them. Media operations (downloads and uploads) do not support non-default predicates in a Retry object. The default will always be used. Other configuration changes for Retry objects such as delays and deadlines are respected. """ content_type = self._get_content_type(content_type, filename=filename) with open(filename, "rb") as file_obj: total_bytes = os.fstat(file_obj.fileno()).st_size self.upload_from_file( file_obj, content_type=content_type, num_retries=num_retries, client=client, size=total_bytes, predefined_acl=predefined_acl, if_generation_match=if_generation_match, if_generation_not_match=if_generation_not_match, if_metageneration_match=if_metageneration_match, if_metageneration_not_match=if_metageneration_not_match, timeout=timeout, checksum=checksum, retry=retry, )
[docs] def upload_from_string( self, data, content_type="text/plain", num_retries=None, client=None, predefined_acl=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, timeout=_DEFAULT_TIMEOUT, checksum=None, retry=DEFAULT_RETRY_IF_GENERATION_SPECIFIED, ): """Upload contents of this blob from the provided string. .. note:: The effect of uploading to an existing blob depends on the "versioning" and "lifecycle" policies defined on the blob's bucket. In the absence of those policies, upload will overwrite any existing contents. See the `object versioning <https://cloud.google.com/storage/docs/object-versioning>`_ and `lifecycle <https://cloud.google.com/storage/docs/lifecycle>`_ API documents for details. If :attr:`user_project` is set on the bucket, bills the API request to that project. :type data: bytes or str :param data: The data to store in this blob. If the value is text, it will be encoded as UTF-8. :type content_type: str :param content_type: (Optional) Type of content being uploaded. Defaults to ``'text/plain'``. :type num_retries: int :param num_retries: Number of upload retries. By default, only uploads with if_generation_match set will be retried, as uploads without the argument are not guaranteed to be idempotent. Setting num_retries will override this default behavior and guarantee retries even when if_generation_match is not set. (Deprecated: This argument will be removed in a future release.) :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :type predefined_acl: str :param predefined_acl: (Optional) Predefined access control list :type if_generation_match: long :param if_generation_match: (Optional) See :ref:`using-if-generation-match` :type if_generation_not_match: long :param if_generation_not_match: (Optional) See :ref:`using-if-generation-not-match` :type if_metageneration_match: long :param if_metageneration_match: (Optional) See :ref:`using-if-metageneration-match` :type if_metageneration_not_match: long :param if_metageneration_not_match: (Optional) See :ref:`using-if-metageneration-not-match` :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` :type checksum: str :param checksum: (Optional) The type of checksum to compute to verify the integrity of the object. If the upload is completed in a single request, the checksum will be entirely precomputed and the remote server will handle verification and error handling. If the upload is too large and must be transmitted in multiple requests, the checksum will be incrementally computed and the client will handle verification and error handling, raising google.resumable_media.common.DataCorruption on a mismatch and attempting to delete the corrupted file. Supported values are "md5", "crc32c" and None. The default is None. :type retry: google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy :param retry: (Optional) How to retry the RPC. A None value will disable retries. A google.api_core.retry.Retry value will enable retries, and the object will define retriable response codes and errors and configure backoff and timeout options. A google.cloud.storage.retry.ConditionalRetryPolicy value wraps a Retry object and activates it only if certain conditions are met. This class exists to provide safe defaults for RPC calls that are not technically safe to retry normally (due to potential data duplication or other side-effects) but become safe to retry if a condition such as if_generation_match is set. See the retry.py source code and docstrings in this package (google.cloud.storage.retry) for information on retry types and how to configure them. Media operations (downloads and uploads) do not support non-default predicates in a Retry object. The default will always be used. Other configuration changes for Retry objects such as delays and deadlines are respected. """ data = _to_bytes(data, encoding="utf-8") string_buffer = BytesIO(data) self.upload_from_file( file_obj=string_buffer, size=len(data), content_type=content_type, num_retries=num_retries, client=client, predefined_acl=predefined_acl, if_generation_match=if_generation_match, if_generation_not_match=if_generation_not_match, if_metageneration_match=if_metageneration_match, if_metageneration_not_match=if_metageneration_not_match, timeout=timeout, checksum=checksum, retry=retry, )
[docs] def create_resumable_upload_session( self, content_type=None, size=None, origin=None, client=None, timeout=_DEFAULT_TIMEOUT, checksum=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, retry=DEFAULT_RETRY_IF_GENERATION_SPECIFIED, ): """Create a resumable upload session. Resumable upload sessions allow you to start an upload session from one client and complete the session in another. This method is called by the initiator to set the metadata and limits. The initiator then passes the session URL to the client that will upload the binary data. The client performs a PUT request on the session URL to complete the upload. This process allows untrusted clients to upload to an access-controlled bucket. For more details, see the `documentation on signed URLs`_. .. _documentation on signed URLs: https://cloud.google.com/storage/\ docs/access-control/signed-urls#signing-resumable The content type of the upload will be determined in order of precedence: - The value passed in to this method (if not :data:`None`) - The value stored on the current blob - The default value ('application/octet-stream') .. note:: The effect of uploading to an existing blob depends on the "versioning" and "lifecycle" policies defined on the blob's bucket. In the absence of those policies, upload will overwrite any existing contents. See the `object versioning <https://cloud.google.com/storage/docs/object-versioning>`_ and `lifecycle <https://cloud.google.com/storage/docs/lifecycle>`_ API documents for details. If :attr:`encryption_key` is set, the blob will be encrypted with a `customer-supplied`_ encryption key. If :attr:`user_project` is set on the bucket, bills the API request to that project. :type size: int :param size: (Optional) The maximum number of bytes that can be uploaded using this session. If the size is not known when creating the session, this should be left blank. :type content_type: str :param content_type: (Optional) Type of content being uploaded. :type origin: str :param origin: (Optional) If set, the upload can only be completed by a user-agent that uploads from the given origin. This can be useful when passing the session to a web client. :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` :type checksum: str :param checksum: (Optional) The type of checksum to compute to verify the integrity of the object. After the upload is complete, the server-computed checksum of the resulting object will be checked and google.resumable_media.common.DataCorruption will be raised on a mismatch. On a validation failure, the client will attempt to delete the uploaded object automatically. Supported values are "md5", "crc32c" and None. The default is None. :type if_generation_match: long :param if_generation_match: (Optional) See :ref:`using-if-generation-match` :type if_generation_not_match: long :param if_generation_not_match: (Optional) See :ref:`using-if-generation-not-match` :type if_metageneration_match: long :param if_metageneration_match: (Optional) See :ref:`using-if-metageneration-match` :type if_metageneration_not_match: long :param if_metageneration_not_match: (Optional) See :ref:`using-if-metageneration-not-match` :type retry: google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy :param retry: (Optional) How to retry the RPC. A None value will disable retries. A google.api_core.retry.Retry value will enable retries, and the object will define retriable response codes and errors and configure backoff and timeout options. A google.cloud.storage.retry.ConditionalRetryPolicy value wraps a Retry object and activates it only if certain conditions are met. This class exists to provide safe defaults for RPC calls that are not technically safe to retry normally (due to potential data duplication or other side-effects) but become safe to retry if a condition such as if_generation_match is set. See the retry.py source code and docstrings in this package (google.cloud.storage.retry) for information on retry types and how to configure them. Media operations (downloads and uploads) do not support non-default predicates in a Retry object. The default will always be used. Other configuration changes for Retry objects such as delays and deadlines are respected. :rtype: str :returns: The resumable upload session URL. The upload can be completed by making an HTTP PUT request with the file's contents. :raises: :class:`google.cloud.exceptions.GoogleCloudError` if the session creation response returns an error status. """ # Handle ConditionalRetryPolicy. if isinstance(retry, ConditionalRetryPolicy): # Conditional retries are designed for non-media calls, which change # arguments into query_params dictionaries. Media operations work # differently, so here we make a "fake" query_params to feed to the # ConditionalRetryPolicy. query_params = { "ifGenerationMatch": if_generation_match, "ifMetagenerationMatch": if_metageneration_match, } retry = retry.get_retry_policy_if_conditions_met(query_params=query_params) extra_headers = {} if origin is not None: # This header is specifically for client-side uploads, it # determines the origins allowed for CORS. extra_headers["Origin"] = origin try: fake_stream = BytesIO(b"") # Send a fake the chunk size which we **know** will be acceptable # to the `ResumableUpload` constructor. The chunk size only # matters when **sending** bytes to an upload. upload, _ = self._initiate_resumable_upload( client, fake_stream, content_type, size, None, predefined_acl=None, if_generation_match=if_generation_match, if_generation_not_match=if_generation_not_match, if_metageneration_match=if_metageneration_match, if_metageneration_not_match=if_metageneration_not_match, extra_headers=extra_headers, chunk_size=self._CHUNK_SIZE_MULTIPLE, timeout=timeout, checksum=checksum, retry=retry, ) return upload.resumable_url except resumable_media.InvalidResponse as exc: _raise_from_invalid_response(exc)
[docs] def get_iam_policy( self, client=None, requested_policy_version=None, timeout=_DEFAULT_TIMEOUT, retry=DEFAULT_RETRY, ): """Retrieve the IAM policy for the object. .. note: Blob- / object-level IAM support does not yet exist and methods currently call an internal ACL backend not providing any utility beyond the blob's :attr:`acl` at this time. The API may be enhanced in the future and is currently undocumented. Use :attr:`acl` for managing object access control. If :attr:`user_project` is set on the bucket, bills the API request to that project. :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the current object's bucket. :type requested_policy_version: int or ``NoneType`` :param requested_policy_version: (Optional) The version of IAM policies to request. If a policy with a condition is requested without setting this, the server will return an error. This must be set to a value of 3 to retrieve IAM policies containing conditions. This is to prevent client code that isn't aware of IAM conditions from interpreting and modifying policies incorrectly. The service might return a policy with version lower than the one that was requested, based on the feature syntax in the policy fetched. :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` :type retry: google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy :param retry: (Optional) How to retry the RPC. See: :ref:`configuring_retries` :rtype: :class:`google.api_core.iam.Policy` :returns: the policy instance, based on the resource returned from the ``getIamPolicy`` API request. """ client = self._require_client(client) query_params = {} if self.user_project is not None: query_params["userProject"] = self.user_project if requested_policy_version is not None: query_params["optionsRequestedPolicyVersion"] = requested_policy_version info = client._get_resource( "%s/iam" % (self.path,), query_params=query_params, timeout=timeout, retry=retry, _target_object=None, ) return Policy.from_api_repr(info)
[docs] def set_iam_policy( self, policy, client=None, timeout=_DEFAULT_TIMEOUT, retry=DEFAULT_RETRY_IF_ETAG_IN_JSON, ): """Update the IAM policy for the bucket. .. note: Blob- / object-level IAM support does not yet exist and methods currently call an internal ACL backend not providing any utility beyond the blob's :attr:`acl` at this time. The API may be enhanced in the future and is currently undocumented. Use :attr:`acl` for managing object access control. If :attr:`user_project` is set on the bucket, bills the API request to that project. :type policy: :class:`google.api_core.iam.Policy` :param policy: policy instance used to update bucket's IAM policy. :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the current bucket. :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` :type retry: google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy :param retry: (Optional) How to retry the RPC. See: :ref:`configuring_retries` :rtype: :class:`google.api_core.iam.Policy` :returns: the policy instance, based on the resource returned from the ``setIamPolicy`` API request. """ client = self._require_client(client) query_params = {} if self.user_project is not None: query_params["userProject"] = self.user_project path = "{}/iam".format(self.path) resource = policy.to_api_repr() resource["resourceId"] = self.path info = client._put_resource( path, resource, query_params=query_params, timeout=timeout, retry=retry, _target_object=None, ) return Policy.from_api_repr(info)
[docs] def test_iam_permissions( self, permissions, client=None, timeout=_DEFAULT_TIMEOUT, retry=DEFAULT_RETRY ): """API call: test permissions .. note: Blob- / object-level IAM support does not yet exist and methods currently call an internal ACL backend not providing any utility beyond the blob's :attr:`acl` at this time. The API may be enhanced in the future and is currently undocumented. Use :attr:`acl` for managing object access control. If :attr:`user_project` is set on the bucket, bills the API request to that project. :type permissions: list of string :param permissions: the permissions to check :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the current bucket. :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` :type retry: google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy :param retry: (Optional) How to retry the RPC. See: :ref:`configuring_retries` :rtype: list of string :returns: the permissions returned by the ``testIamPermissions`` API request. """ client = self._require_client(client) query_params = {"permissions": permissions} if self.user_project is not None: query_params["userProject"] = self.user_project path = "%s/iam/testPermissions" % (self.path,) resp = client._get_resource( path, query_params=query_params, timeout=timeout, retry=retry, _target_object=None, ) return resp.get("permissions", [])
[docs] def make_public(self, client=None, timeout=_DEFAULT_TIMEOUT): """Update blob's ACL, granting read access to anonymous users. :type client: :class:`~google.cloud.storage.client.Client` or ``NoneType`` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` """ self.acl.all().grant_read() self.acl.save(client=client, timeout=timeout)
[docs] def make_private(self, client=None, timeout=_DEFAULT_TIMEOUT): """Update blob's ACL, revoking read access for anonymous users. :type client: :class:`~google.cloud.storage.client.Client` or ``NoneType`` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` """ self.acl.all().revoke_read() self.acl.save(client=client, timeout=timeout)
[docs] def compose( self, sources, client=None, timeout=_DEFAULT_TIMEOUT, if_generation_match=None, if_metageneration_match=None, if_source_generation_match=None, retry=DEFAULT_RETRY_IF_GENERATION_SPECIFIED, ): """Concatenate source blobs into this one. If :attr:`user_project` is set on the bucket, bills the API request to that project. :type sources: list of :class:`Blob` :param sources: Blobs whose contents will be composed into this blob. :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` :type if_generation_match: long :param if_generation_match: (Optional) Makes the operation conditional on whether the destination object's current generation matches the given value. Setting to 0 makes the operation succeed only if there are no live versions of the object. .. note:: In a previous version, this argument worked identically to the ``if_source_generation_match`` argument. For backwards-compatibility reasons, if a list is passed in, this argument will behave like ``if_source_generation_match`` and also issue a DeprecationWarning. :type if_metageneration_match: long :param if_metageneration_match: (Optional) Makes the operation conditional on whether the destination object's current metageneration matches the given value. If a list of long is passed in, no match operation will be performed. (Deprecated: type(list of long) is supported for backwards-compatability reasons only.) :type if_source_generation_match: list of long :param if_source_generation_match: (Optional) Makes the operation conditional on whether the current generation of each source blob matches the corresponding generation. The list must match ``sources`` item-to-item. :type retry: google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy :param retry: (Optional) How to retry the RPC. See: :ref:`configuring_retries` Example: Compose blobs using source generation match preconditions. >>> from google.cloud import storage >>> client = storage.Client() >>> bucket = client.bucket("bucket-name") >>> blobs = [bucket.blob("blob-name-1"), bucket.blob("blob-name-2")] >>> if_source_generation_match = [None] * len(blobs) >>> if_source_generation_match[0] = "123" # precondition for "blob-name-1" >>> composed_blob = bucket.blob("composed-name") >>> composed_blob.compose(blobs, if_source_generation_match=if_source_generation_match) """ sources_len = len(sources) client = self._require_client(client) query_params = {} if isinstance(if_generation_match, list): warnings.warn( _COMPOSE_IF_GENERATION_LIST_DEPRECATED, DeprecationWarning, stacklevel=2, ) if if_source_generation_match is not None: raise ValueError( _COMPOSE_IF_GENERATION_LIST_AND_IF_SOURCE_GENERATION_ERROR ) if_source_generation_match = if_generation_match if_generation_match = None if isinstance(if_metageneration_match, list): warnings.warn( _COMPOSE_IF_METAGENERATION_LIST_DEPRECATED, DeprecationWarning, stacklevel=2, ) if_metageneration_match = None if if_source_generation_match is None: if_source_generation_match = [None] * sources_len if len(if_source_generation_match) != sources_len: raise ValueError(_COMPOSE_IF_SOURCE_GENERATION_MISMATCH_ERROR) source_objects = [] for source, source_generation in zip(sources, if_source_generation_match): source_object = {"name": source.name, "generation": source.generation} preconditions = {} if source_generation is not None: preconditions["ifGenerationMatch"] = source_generation if preconditions: source_object["objectPreconditions"] = preconditions source_objects.append(source_object) request = { "sourceObjects": source_objects, "destination": self._properties.copy(), } if self.user_project is not None: query_params["userProject"] = self.user_project _add_generation_match_parameters( query_params, if_generation_match=if_generation_match, if_metageneration_match=if_metageneration_match, ) api_response = client._post_resource( "{}/compose".format(self.path), request, query_params=query_params, timeout=timeout, retry=retry, _target_object=self, ) self._set_properties(api_response)
[docs] def rewrite( self, source, token=None, client=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, if_source_generation_match=None, if_source_generation_not_match=None, if_source_metageneration_match=None, if_source_metageneration_not_match=None, timeout=_DEFAULT_TIMEOUT, retry=DEFAULT_RETRY_IF_GENERATION_SPECIFIED, ): """Rewrite source blob into this one. If :attr:`user_project` is set on the bucket, bills the API request to that project. :type source: :class:`Blob` :param source: blob whose contents will be rewritten into this blob. :type token: str :param token: (Optional) Token returned from an earlier, not-completed call to rewrite the same source blob. If passed, result will include updated status, total bytes written. :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :type if_generation_match: long :param if_generation_match: (Optional) See :ref:`using-if-generation-match` Note that the generation to be matched is that of the ``destination`` blob. :type if_generation_not_match: long :param if_generation_not_match: (Optional) See :ref:`using-if-generation-not-match` Note that the generation to be matched is that of the ``destination`` blob. :type if_metageneration_match: long :param if_metageneration_match: (Optional) See :ref:`using-if-metageneration-match` Note that the metageneration to be matched is that of the ``destination`` blob. :type if_metageneration_not_match: long :param if_metageneration_not_match: (Optional) See :ref:`using-if-metageneration-not-match` Note that the metageneration to be matched is that of the ``destination`` blob. :type if_source_generation_match: long :param if_source_generation_match: (Optional) Makes the operation conditional on whether the source object's generation matches the given value. :type if_source_generation_not_match: long :param if_source_generation_not_match: (Optional) Makes the operation conditional on whether the source object's generation does not match the given value. :type if_source_metageneration_match: long :param if_source_metageneration_match: (Optional) Makes the operation conditional on whether the source object's current metageneration matches the given value. :type if_source_metageneration_not_match: long :param if_source_metageneration_not_match: (Optional) Makes the operation conditional on whether the source object's current metageneration does not match the given value. :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` :type retry: google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy :param retry: (Optional) How to retry the RPC. See: :ref:`configuring_retries` :rtype: tuple :returns: ``(token, bytes_rewritten, total_bytes)``, where ``token`` is a rewrite token (``None`` if the rewrite is complete), ``bytes_rewritten`` is the number of bytes rewritten so far, and ``total_bytes`` is the total number of bytes to be rewritten. """ client = self._require_client(client) headers = _get_encryption_headers(self._encryption_key) headers.update(_get_encryption_headers(source._encryption_key, source=True)) query_params = self._query_params if "generation" in query_params: del query_params["generation"] if token: query_params["rewriteToken"] = token if source.generation: query_params["sourceGeneration"] = source.generation if self.kms_key_name is not None: query_params["destinationKmsKeyName"] = self.kms_key_name _add_generation_match_parameters( query_params, if_generation_match=if_generation_match, if_generation_not_match=if_generation_not_match, if_metageneration_match=if_metageneration_match, if_metageneration_not_match=if_metageneration_not_match, if_source_generation_match=if_source_generation_match, if_source_generation_not_match=if_source_generation_not_match, if_source_metageneration_match=if_source_metageneration_match, if_source_metageneration_not_match=if_source_metageneration_not_match, ) path = "{}/rewriteTo{}".format(source.path, self.path) api_response = client._post_resource( path, self._properties, query_params=query_params, headers=headers, timeout=timeout, retry=retry, _target_object=self, ) rewritten = int(api_response["totalBytesRewritten"]) size = int(api_response["objectSize"]) # The resource key is set if and only if the API response is # completely done. Additionally, there is no rewrite token to return # in this case. if api_response["done"]: self._set_properties(api_response["resource"]) return None, rewritten, size return api_response["rewriteToken"], rewritten, size
[docs] def update_storage_class( self, new_class, client=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, if_source_generation_match=None, if_source_generation_not_match=None, if_source_metageneration_match=None, if_source_metageneration_not_match=None, timeout=_DEFAULT_TIMEOUT, retry=DEFAULT_RETRY_IF_GENERATION_SPECIFIED, ): """Update blob's storage class via a rewrite-in-place. This helper will wait for the rewrite to complete before returning, so it may take some time for large files. See https://cloud.google.com/storage/docs/per-object-storage-class If :attr:`user_project` is set on the bucket, bills the API request to that project. :type new_class: str :param new_class: new storage class for the object. One of: :attr:`~google.cloud.storage.constants.NEARLINE_STORAGE_CLASS`, :attr:`~google.cloud.storage.constants.COLDLINE_STORAGE_CLASS`, :attr:`~google.cloud.storage.constants.ARCHIVE_STORAGE_CLASS`, :attr:`~google.cloud.storage.constants.STANDARD_STORAGE_CLASS`, :attr:`~google.cloud.storage.constants.MULTI_REGIONAL_LEGACY_STORAGE_CLASS`, or :attr:`~google.cloud.storage.constants.REGIONAL_LEGACY_STORAGE_CLASS`. :type client: :class:`~google.cloud.storage.client.Client` :param client: (Optional) The client to use. If not passed, falls back to the ``client`` stored on the blob's bucket. :type if_generation_match: long :param if_generation_match: (Optional) See :ref:`using-if-generation-match` Note that the generation to be matched is that of the ``destination`` blob. :type if_generation_not_match: long :param if_generation_not_match: (Optional) See :ref:`using-if-generation-not-match` Note that the generation to be matched is that of the ``destination`` blob. :type if_metageneration_match: long :param if_metageneration_match: (Optional) See :ref:`using-if-metageneration-match` Note that the metageneration to be matched is that of the ``destination`` blob. :type if_metageneration_not_match: long :param if_metageneration_not_match: (Optional) See :ref:`using-if-metageneration-not-match` Note that the metageneration to be matched is that of the ``destination`` blob. :type if_source_generation_match: long :param if_source_generation_match: (Optional) Makes the operation conditional on whether the source object's generation matches the given value. :type if_source_generation_not_match: long :param if_source_generation_not_match: (Optional) Makes the operation conditional on whether the source object's generation does not match the given value. :type if_source_metageneration_match: long :param if_source_metageneration_match: (Optional) Makes the operation conditional on whether the source object's current metageneration matches the given value. :type if_source_metageneration_not_match: long :param if_source_metageneration_not_match: (Optional) Makes the operation conditional on whether the source object's current metageneration does not match the given value. :type timeout: float or tuple :param timeout: (Optional) The amount of time, in seconds, to wait for the server response. See: :ref:`configuring_timeouts` :type retry: google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy :param retry: (Optional) How to retry the RPC. See: :ref:`configuring_retries` """ if new_class not in self.STORAGE_CLASSES: raise ValueError("Invalid storage class: %s" % (new_class,)) # Update current blob's storage class prior to rewrite self._patch_property("storageClass", new_class) # Execute consecutive rewrite operations until operation is done token, _, _ = self.rewrite( self, if_generation_match=if_generation_match, if_generation_not_match=if_generation_not_match, if_metageneration_match=if_metageneration_match, if_metageneration_not_match=if_metageneration_not_match, if_source_generation_match=if_source_generation_match, if_source_generation_not_match=if_source_generation_not_match, if_source_metageneration_match=if_source_metageneration_match, if_source_metageneration_not_match=if_source_metageneration_not_match, timeout=timeout, retry=retry, ) while token is not None: token, _, _ = self.rewrite( self, token=token, if_generation_match=if_generation_match, if_generation_not_match=if_generation_not_match, if_metageneration_match=if_metageneration_match, if_metageneration_not_match=if_metageneration_not_match, if_source_generation_match=if_source_generation_match, if_source_generation_not_match=if_source_generation_not_match, if_source_metageneration_match=if_source_metageneration_match, if_source_metageneration_not_match=if_source_metageneration_not_match, timeout=timeout, retry=retry, )
[docs] def open( self, mode="r", chunk_size=None, encoding=None, errors=None, newline=None, **kwargs ): r"""Create a file handler for file-like I/O to or from this blob. This method can be used as a context manager, just like Python's built-in 'open()' function. While reading, as with other read methods, if blob.generation is not set the most recent blob generation will be used. Because the file-like IO reader downloads progressively in chunks, this could result in data from multiple versions being mixed together. If this is a concern, use either bucket.get_blob(), or blob.reload(), which will download the latest generation number and set it; or, if the generation is known, set it manually, for instance with bucket.blob(generation=123456). Checksumming (hashing) to verify data integrity is disabled for reads using this feature because reads are implemented using request ranges, which do not provide checksums to validate. See https://cloud.google.com/storage/docs/hashes-etags for details. :type mode: str :param mode: (Optional) A mode string, as per standard Python `open()` semantics.The first character must be 'r', to open the blob for reading, or 'w' to open it for writing. The second character, if present, must be 't' for (unicode) text mode, or 'b' for bytes mode. If the second character is omitted, text mode is the default. :type chunk_size: long :param chunk_size: (Optional) For reads, the minimum number of bytes to read at a time. If fewer bytes than the chunk_size are requested, the remainder is buffered. For writes, the maximum number of bytes to buffer before sending data to the server, and the size of each request when data is sent. Writes are implemented as a "resumable upload", so chunk_size for writes must be exactly a multiple of 256KiB as with other resumable uploads. The default is 40 MiB. :type encoding: str :param encoding: (Optional) For text mode only, the name of the encoding that the stream will be decoded or encoded with. If omitted, it defaults to locale.getpreferredencoding(False). :type errors: str :param errors: (Optional) For text mode only, an optional string that specifies how encoding and decoding errors are to be handled. Pass 'strict' to raise a ValueError exception if there is an encoding error (the default of None has the same effect), or pass 'ignore' to ignore errors. (Note that ignoring encoding errors can lead to data loss.) Other more rarely-used options are also available; see the Python 'io' module documentation for 'io.TextIOWrapper' for a complete list. :type newline: str :param newline: (Optional) For text mode only, controls how line endings are handled. It can be None, '', '\n', '\r', and '\r\n'. If None, reads use "universal newline mode" and writes use the system default. See the Python 'io' module documentation for 'io.TextIOWrapper' for details. :param kwargs: Keyword arguments to pass to the underlying API calls. For both uploads and downloads, the following arguments are supported: - ``if_generation_match`` - ``if_generation_not_match`` - ``if_metageneration_match`` - ``if_metageneration_not_match`` - ``timeout`` - ``retry`` For uploads only, the following additional arguments are supported: - ``content_type`` - ``num_retries`` - ``predefined_acl`` - ``checksum`` .. note:: ``num_retries`` is supported for backwards-compatibility reasons only; please use ``retry`` with a Retry object or ConditionalRetryPolicy instead. :returns: A 'BlobReader' or 'BlobWriter' from 'google.cloud.storage.fileio', or an 'io.TextIOWrapper' around one of those classes, depending on the 'mode' argument. Example: Read from a text blob by using open() as context manager. Using bucket.get_blob() fetches metadata such as the generation, which prevents race conditions in case the blob is modified. >>> from google.cloud import storage >>> client = storage.Client() >>> bucket = client.bucket("bucket-name") >>> blob = bucket.get_blob("blob-name.txt") >>> with blob.open("rt") as f: >>> print(f.read()) """ if mode == "rb": if encoding or errors or newline: raise ValueError( "encoding, errors and newline arguments are for text mode only" ) return BlobReader(self, chunk_size=chunk_size, **kwargs) elif mode == "wb": if encoding or errors or newline: raise ValueError( "encoding, errors and newline arguments are for text mode only" ) return BlobWriter(self, chunk_size=chunk_size, **kwargs) elif mode in ("r", "rt"): return TextIOWrapper( BlobReader(self, chunk_size=chunk_size, **kwargs), encoding=encoding, errors=errors, newline=newline, ) elif mode in ("w", "wt"): return TextIOWrapper( BlobWriter(self, chunk_size=chunk_size, text_mode=True, **kwargs), encoding=encoding, errors=errors, newline=newline, ) else: raise NotImplementedError( "Supported modes strings are 'r', 'rb', 'rt', 'w', 'wb', and 'wt' only." )
cache_control = _scalar_property("cacheControl") """HTTP 'Cache-Control' header for this object. See `RFC 7234`_ and `API reference docs`_. :rtype: str or ``NoneType`` .. _RFC 7234: https://tools.ietf.org/html/rfc7234#section-5.2 """ content_disposition = _scalar_property("contentDisposition") """HTTP 'Content-Disposition' header for this object. See `RFC 6266`_ and `API reference docs`_. :rtype: str or ``NoneType`` .. _RFC 6266: https://tools.ietf.org/html/rfc7234#section-5.2 """ content_encoding = _scalar_property("contentEncoding") """HTTP 'Content-Encoding' header for this object. See `RFC 7231`_ and `API reference docs`_. :rtype: str or ``NoneType`` .. _RFC 7231: https://tools.ietf.org/html/rfc7231#section-3.1.2.2 """ content_language = _scalar_property("contentLanguage") """HTTP 'Content-Language' header for this object. See `BCP47`_ and `API reference docs`_. :rtype: str or ``NoneType`` .. _BCP47: https://tools.ietf.org/html/bcp47 """ content_type = _scalar_property(_CONTENT_TYPE_FIELD) """HTTP 'Content-Type' header for this object. See `RFC 2616`_ and `API reference docs`_. :rtype: str or ``NoneType`` .. _RFC 2616: https://tools.ietf.org/html/rfc2616#section-14.17 """ crc32c = _scalar_property("crc32c") """CRC32C checksum for this object. This returns the blob's CRC32C checksum. To retrieve the value, first use a reload method of the Blob class which loads the blob's properties from the server. See `RFC 4960`_ and `API reference docs`_. If not set before upload, the server will compute the hash. :rtype: str or ``NoneType`` .. _RFC 4960: https://tools.ietf.org/html/rfc4960#appendix-B Example: Retrieve the crc32c hash of blob. >>> from google.cloud import storage >>> client = storage.Client() >>> bucket = client.get_bucket("my-bucket-name") >>> blob = bucket.blob('my-blob') >>> blob.crc32c # return None >>> blob.reload() >>> blob.crc32c # return crc32c hash >>> # Another approach >>> blob = bucket.get_blob('my-blob') >>> blob.crc32c # return crc32c hash """ @property def component_count(self): """Number of underlying components that make up this object. See https://cloud.google.com/storage/docs/json_api/v1/objects :rtype: int or ``NoneType`` :returns: The component count (in case of a composed object) or ``None`` if the blob's resource has not been loaded from the server. This property will not be set on objects not created via ``compose``. """ component_count = self._properties.get("componentCount") if component_count is not None: return int(component_count) @property def etag(self): """Retrieve the ETag for the object. See `RFC 2616 (etags)`_ and `API reference docs`_. :rtype: str or ``NoneType`` :returns: The blob etag or ``None`` if the blob's resource has not been loaded from the server. .. _RFC 2616 (etags): https://tools.ietf.org/html/rfc2616#section-3.11 """ return self._properties.get("etag") event_based_hold = _scalar_property("eventBasedHold") """Is an event-based hold active on the object? See `API reference docs`_. If the property is not set locally, returns :data:`None`. :rtype: bool or ``NoneType`` """ @property def generation(self): """Retrieve the generation for the object. See https://cloud.google.com/storage/docs/json_api/v1/objects :rtype: int or ``NoneType`` :returns: The generation of the blob or ``None`` if the blob's resource has not been loaded from the server. """ generation = self._properties.get("generation") if generation is not None: return int(generation) @property def id(self): """Retrieve the ID for the object. See https://cloud.google.com/storage/docs/json_api/v1/objects The ID consists of the bucket name, object name, and generation number. :rtype: str or ``NoneType`` :returns: The ID of the blob or ``None`` if the blob's resource has not been loaded from the server. """ return self._properties.get("id") md5_hash = _scalar_property("md5Hash") """MD5 hash for this object. This returns the blob's MD5 hash. To retrieve the value, first use a reload method of the Blob class which loads the blob's properties from the server. See `RFC 1321`_ and `API reference docs`_. If not set before upload, the server will compute the hash. :rtype: str or ``NoneType`` .. _RFC 1321: https://tools.ietf.org/html/rfc1321 Example: Retrieve the md5 hash of blob. >>> from google.cloud import storage >>> client = storage.Client() >>> bucket = client.get_bucket("my-bucket-name") >>> blob = bucket.blob('my-blob') >>> blob.md5_hash # return None >>> blob.reload() >>> blob.md5_hash # return md5 hash >>> # Another approach >>> blob = bucket.get_blob('my-blob') >>> blob.md5_hash # return md5 hash """ @property def media_link(self): """Retrieve the media download URI for the object. See https://cloud.google.com/storage/docs/json_api/v1/objects :rtype: str or ``NoneType`` :returns: The media link for the blob or ``None`` if the blob's resource has not been loaded from the server. """ return self._properties.get("mediaLink") @property def metadata(self): """Retrieve arbitrary/application specific metadata for the object. See https://cloud.google.com/storage/docs/json_api/v1/objects :setter: Update arbitrary/application specific metadata for the object. :getter: Retrieve arbitrary/application specific metadata for the object. :rtype: dict or ``NoneType`` :returns: The metadata associated with the blob or ``None`` if the property is not set. """ return copy.deepcopy(self._properties.get("metadata")) @metadata.setter def metadata(self, value): """Update arbitrary/application specific metadata for the object. Values are stored to GCS as strings. To delete a key, set its value to None and call blob.patch(). See https://cloud.google.com/storage/docs/json_api/v1/objects :type value: dict :param value: The blob metadata to set. """ if value is not None: value = {k: str(v) if v is not None else None for k, v in value.items()} self._patch_property("metadata", value) @property def metageneration(self): """Retrieve the metageneration for the object. See https://cloud.google.com/storage/docs/json_api/v1/objects :rtype: int or ``NoneType`` :returns: The metageneration of the blob or ``None`` if the blob's resource has not been loaded from the server. """ metageneration = self._properties.get("metageneration") if metageneration is not None: return int(metageneration) @property def owner(self): """Retrieve info about the owner of the object. See https://cloud.google.com/storage/docs/json_api/v1/objects :rtype: dict or ``NoneType`` :returns: Mapping of owner's role/ID, or ``None`` if the blob's resource has not been loaded from the server. """ return copy.deepcopy(self._properties.get("owner")) @property def retention_expiration_time(self): """Retrieve timestamp at which the object's retention period expires. See https://cloud.google.com/storage/docs/json_api/v1/objects :rtype: :class:`datetime.datetime` or ``NoneType`` :returns: Datetime object parsed from RFC3339 valid timestamp, or ``None`` if the property is not set locally. """ value = self._properties.get("retentionExpirationTime") if value is not None: return _rfc3339_nanos_to_datetime(value) @property def self_link(self): """Retrieve the URI for the object. See https://cloud.google.com/storage/docs/json_api/v1/objects :rtype: str or ``NoneType`` :returns: The self link for the blob or ``None`` if the blob's resource has not been loaded from the server. """ return self._properties.get("selfLink") @property def size(self): """Size of the object, in bytes. See https://cloud.google.com/storage/docs/json_api/v1/objects :rtype: int or ``NoneType`` :returns: The size of the blob or ``None`` if the blob's resource has not been loaded from the server. """ size = self._properties.get("size") if size is not None: return int(size) @property def kms_key_name(self): """Resource name of Cloud KMS key used to encrypt the blob's contents. :rtype: str or ``NoneType`` :returns: The resource name or ``None`` if no Cloud KMS key was used, or the blob's resource has not been loaded from the server. """ return self._properties.get("kmsKeyName") @kms_key_name.setter def kms_key_name(self, value): """Set KMS encryption key for object. :type value: str or ``NoneType`` :param value: new KMS key name (None to clear any existing key). """ self._patch_property("kmsKeyName", value) storage_class = _scalar_property("storageClass") """Retrieve the storage class for the object. This can only be set at blob / object **creation** time. If you'd like to change the storage class **after** the blob / object already exists in a bucket, call :meth:`update_storage_class` (which uses :meth:`rewrite`). See https://cloud.google.com/storage/docs/storage-classes :rtype: str or ``NoneType`` :returns: If set, one of :attr:`~google.cloud.storage.constants.STANDARD_STORAGE_CLASS`, :attr:`~google.cloud.storage.constants.NEARLINE_STORAGE_CLASS`, :attr:`~google.cloud.storage.constants.COLDLINE_STORAGE_CLASS`, :attr:`~google.cloud.storage.constants.ARCHIVE_STORAGE_CLASS`, :attr:`~google.cloud.storage.constants.MULTI_REGIONAL_LEGACY_STORAGE_CLASS`, :attr:`~google.cloud.storage.constants.REGIONAL_LEGACY_STORAGE_CLASS`, :attr:`~google.cloud.storage.constants.DURABLE_REDUCED_AVAILABILITY_STORAGE_CLASS`, else ``None``. """ temporary_hold = _scalar_property("temporaryHold") """Is a temporary hold active on the object? See `API reference docs`_. If the property is not set locally, returns :data:`None`. :rtype: bool or ``NoneType`` """ @property def time_deleted(self): """Retrieve the timestamp at which the object was deleted. See https://cloud.google.com/storage/docs/json_api/v1/objects :rtype: :class:`datetime.datetime` or ``NoneType`` :returns: Datetime object parsed from RFC3339 valid timestamp, or ``None`` if the blob's resource has not been loaded from the server (see :meth:`reload`). If the blob has not been deleted, this will never be set. """ value = self._properties.get("timeDeleted") if value is not None: return _rfc3339_nanos_to_datetime(value) @property def time_created(self): """Retrieve the timestamp at which the object was created. See https://cloud.google.com/storage/docs/json_api/v1/objects :rtype: :class:`datetime.datetime` or ``NoneType`` :returns: Datetime object parsed from RFC3339 valid timestamp, or ``None`` if the blob's resource has not been loaded from the server (see :meth:`reload`). """ value = self._properties.get("timeCreated") if value is not None: return _rfc3339_nanos_to_datetime(value) @property def updated(self): """Retrieve the timestamp at which the object was updated. See https://cloud.google.com/storage/docs/json_api/v1/objects :rtype: :class:`datetime.datetime` or ``NoneType`` :returns: Datetime object parsed from RFC3339 valid timestamp, or ``None`` if the blob's resource has not been loaded from the server (see :meth:`reload`). """ value = self._properties.get("updated") if value is not None: return _rfc3339_nanos_to_datetime(value) @property def custom_time(self): """Retrieve the custom time for the object. See https://cloud.google.com/storage/docs/json_api/v1/objects :rtype: :class:`datetime.datetime` or ``NoneType`` :returns: Datetime object parsed from RFC3339 valid timestamp, or ``None`` if the blob's resource has not been loaded from the server (see :meth:`reload`). """ value = self._properties.get("customTime") if value is not None: return _rfc3339_nanos_to_datetime(value) @custom_time.setter def custom_time(self, value): """Set the custom time for the object. Once set on the server side object, this value can't be unset, but may only changed to a custom datetime in the future. If :attr:`custom_time` must be unset, either perform a rewrite operation or upload the data again. See https://cloud.google.com/storage/docs/json_api/v1/objects :type value: :class:`datetime.datetime` :param value: new value """ if value is not None: value = _datetime_to_rfc3339(value) self._patch_property("customTime", value)
def _get_host_name(connection): """Returns the host name from the given connection. :type connection: :class:`~google.cloud.storage._http.Connection` :param connection: The connection object. :rtype: str :returns: The host name. """ # TODO: After google-cloud-core 1.6.0 is stable and we upgrade it # to 1.6.0 in setup.py, we no longer need to check the attribute # existence. We can simply return connection.get_api_base_url_for_mtls(). return ( connection.API_BASE_URL if not hasattr(connection, "get_api_base_url_for_mtls") else connection.get_api_base_url_for_mtls() ) def _get_encryption_headers(key, source=False): """Builds customer encryption key headers :type key: bytes :param key: 32 byte key to build request key and hash. :type source: bool :param source: If true, return headers for the "source" blob; otherwise, return headers for the "destination" blob. :rtype: dict :returns: dict of HTTP headers being sent in request. """ if key is None: return {} key = _to_bytes(key) key_hash = hashlib.sha256(key).digest() key_hash = base64.b64encode(key_hash) key = base64.b64encode(key) if source: prefix = "X-Goog-Copy-Source-Encryption-" else: prefix = "X-Goog-Encryption-" return { prefix + "Algorithm": "AES256", prefix + "Key": _bytes_to_unicode(key), prefix + "Key-Sha256": _bytes_to_unicode(key_hash), } def _quote(value, safe=b"~"): """URL-quote a string. If the value is unicode, this method first UTF-8 encodes it as bytes and then quotes the bytes. (In Python 3, ``urllib.parse.quote`` does this encoding automatically, but in Python 2, non-ASCII characters cannot be quoted.) :type value: str or bytes :param value: The value to be URL-quoted. :type safe: bytes :param safe: Bytes *not* to be quoted. By default, includes only ``b'~'``. :rtype: str :returns: The encoded value (bytes in Python 2, unicode in Python 3). """ value = _to_bytes(value, encoding="utf-8") return quote(value, safe=safe) def _maybe_rewind(stream, rewind=False): """Rewind the stream if desired. :type stream: IO[bytes] :param stream: A bytes IO object open for reading. :type rewind: bool :param rewind: Indicates if we should seek to the beginning of the stream. """ if rewind: stream.seek(0, os.SEEK_SET) def _raise_from_invalid_response(error): """Re-wrap and raise an ``InvalidResponse`` exception. :type error: :exc:`google.resumable_media.InvalidResponse` :param error: A caught exception from the ``google-resumable-media`` library. :raises: :class:`~google.cloud.exceptions.GoogleCloudError` corresponding to the failed status code """ response = error.response # The 'response.text' gives the actual reason of error, where 'error' gives # the message of expected status code. if response.text: error_message = response.text + ": " + str(error) else: error_message = str(error) message = u"{method} {url}: {error}".format( method=response.request.method, url=response.request.url, error=error_message ) raise exceptions.from_http_status(response.status_code, message, response=response) def _add_query_parameters(base_url, name_value_pairs): """Add one query parameter to a base URL. :type base_url: string :param base_url: Base URL (may already contain query parameters) :type name_value_pairs: list of (string, string) tuples. :param name_value_pairs: Names and values of the query parameters to add :rtype: string :returns: URL with additional query strings appended. """ if len(name_value_pairs) == 0: return base_url scheme, netloc, path, query, frag = urlsplit(base_url) query = parse_qsl(query) query.extend(name_value_pairs) return urlunsplit((scheme, netloc, path, urlencode(query), frag))