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Added delete option to database storage.

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Batuhan Berk Başoğlu 2020-10-12 12:10:01 -04:00
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# Copyright 2017 Google Inc.
#
# 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.
"""Support for resumable uploads.
Also supported here are simple (media) uploads and multipart
uploads that contain both metadata and a small file as payload.
"""
from google.resumable_media import _upload
from google.resumable_media.requests import _request_helpers
class SimpleUpload(_request_helpers.RequestsMixin, _upload.SimpleUpload):
"""Upload a resource to a Google API.
A **simple** media upload sends no metadata and completes the upload
in a single request.
Args:
upload_url (str): The URL where the content will be uploaded.
headers (Optional[Mapping[str, str]]): Extra headers that should
be sent with the request, e.g. headers for encrypted data.
Attributes:
upload_url (str): The URL where the content will be uploaded.
"""
def transmit(
self,
transport,
data,
content_type,
timeout=(
_request_helpers._DEFAULT_CONNECT_TIMEOUT,
_request_helpers._DEFAULT_READ_TIMEOUT,
),
):
"""Transmit the resource to be uploaded.
Args:
transport (~requests.Session): A ``requests`` object which can
make authenticated requests.
data (bytes): The resource content to be uploaded.
content_type (str): The content type of the resource, e.g. a JPEG
image has content type ``image/jpeg``.
timeout (Optional[Union[float, Tuple[float, float]]]):
The number of seconds to wait for the server response.
Depending on the retry strategy, a request may be repeated
several times using the same timeout each time.
Can also be passed as a tuple (connect_timeout, read_timeout).
See :meth:`requests.Session.request` documentation for details.
Returns:
~requests.Response: The HTTP response returned by ``transport``.
"""
method, url, payload, headers = self._prepare_request(data, content_type)
response = _request_helpers.http_request(
transport,
method,
url,
data=payload,
headers=headers,
retry_strategy=self._retry_strategy,
timeout=timeout,
)
self._process_response(response)
return response
class MultipartUpload(_request_helpers.RequestsMixin, _upload.MultipartUpload):
"""Upload a resource with metadata to a Google API.
A **multipart** upload sends both metadata and the resource in a single
(multipart) request.
Args:
upload_url (str): The URL where the content will be uploaded.
headers (Optional[Mapping[str, str]]): Extra headers that should
be sent with the request, e.g. headers for encrypted data.
checksum Optional([str]): 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.
Attributes:
upload_url (str): The URL where the content will be uploaded.
"""
def transmit(
self,
transport,
data,
metadata,
content_type,
timeout=(
_request_helpers._DEFAULT_CONNECT_TIMEOUT,
_request_helpers._DEFAULT_READ_TIMEOUT,
),
):
"""Transmit the resource to be uploaded.
Args:
transport (~requests.Session): A ``requests`` object which can
make authenticated requests.
data (bytes): The resource content to be uploaded.
metadata (Mapping[str, str]): The resource metadata, such as an
ACL list.
content_type (str): The content type of the resource, e.g. a JPEG
image has content type ``image/jpeg``.
timeout (Optional[Union[float, Tuple[float, float]]]):
The number of seconds to wait for the server response.
Depending on the retry strategy, a request may be repeated
several times using the same timeout each time.
Can also be passed as a tuple (connect_timeout, read_timeout).
See :meth:`requests.Session.request` documentation for details.
Returns:
~requests.Response: The HTTP response returned by ``transport``.
"""
method, url, payload, headers = self._prepare_request(
data, metadata, content_type
)
response = _request_helpers.http_request(
transport,
method,
url,
data=payload,
headers=headers,
retry_strategy=self._retry_strategy,
timeout=timeout,
)
self._process_response(response)
return response
class ResumableUpload(_request_helpers.RequestsMixin, _upload.ResumableUpload):
"""Initiate and fulfill a resumable upload to a Google API.
A **resumable** upload sends an initial request with the resource metadata
and then gets assigned an upload ID / upload URL to send bytes to.
Using the upload URL, the upload is then done in chunks (determined by
the user) until all bytes have been uploaded.
When constructing a resumable upload, only the resumable upload URL and
the chunk size are required:
.. testsetup:: resumable-constructor
bucket = u'bucket-foo'
.. doctest:: resumable-constructor
>>> from google.resumable_media.requests import ResumableUpload
>>>
>>> url_template = (
... u'https://www.googleapis.com/upload/storage/v1/b/{bucket}/o?'
... u'uploadType=resumable')
>>> upload_url = url_template.format(bucket=bucket)
>>>
>>> chunk_size = 3 * 1024 * 1024 # 3MB
>>> upload = ResumableUpload(upload_url, chunk_size)
When initiating an upload (via :meth:`initiate`), the caller is expected
to pass the resource being uploaded as a file-like ``stream``. If the size
of the resource is explicitly known, it can be passed in directly:
.. testsetup:: resumable-explicit-size
import os
import tempfile
import mock
import requests
from six.moves import http_client
from google.resumable_media.requests import ResumableUpload
upload_url = u'http://test.invalid'
chunk_size = 3 * 1024 * 1024 # 3MB
upload = ResumableUpload(upload_url, chunk_size)
file_desc, filename = tempfile.mkstemp()
os.close(file_desc)
data = b'some bytes!'
with open(filename, u'wb') as file_obj:
file_obj.write(data)
fake_response = requests.Response()
fake_response.status_code = int(http_client.OK)
fake_response._content = b''
resumable_url = u'http://test.invalid?upload_id=7up'
fake_response.headers[u'location'] = resumable_url
post_method = mock.Mock(return_value=fake_response, spec=[])
transport = mock.Mock(request=post_method, spec=['request'])
.. doctest:: resumable-explicit-size
>>> import os
>>>
>>> upload.total_bytes is None
True
>>>
>>> stream = open(filename, u'rb')
>>> total_bytes = os.path.getsize(filename)
>>> metadata = {u'name': filename}
>>> response = upload.initiate(
... transport, stream, metadata, u'text/plain',
... total_bytes=total_bytes)
>>> response
<Response [200]>
>>>
>>> upload.total_bytes == total_bytes
True
.. testcleanup:: resumable-explicit-size
os.remove(filename)
If the stream is in a "final" state (i.e. it won't have any more bytes
written to it), the total number of bytes can be determined implicitly
from the ``stream`` itself:
.. testsetup:: resumable-implicit-size
import io
import mock
import requests
from six.moves import http_client
from google.resumable_media.requests import ResumableUpload
upload_url = u'http://test.invalid'
chunk_size = 3 * 1024 * 1024 # 3MB
upload = ResumableUpload(upload_url, chunk_size)
fake_response = requests.Response()
fake_response.status_code = int(http_client.OK)
fake_response._content = b''
resumable_url = u'http://test.invalid?upload_id=7up'
fake_response.headers[u'location'] = resumable_url
post_method = mock.Mock(return_value=fake_response, spec=[])
transport = mock.Mock(request=post_method, spec=['request'])
data = b'some MOAR bytes!'
metadata = {u'name': u'some-file.jpg'}
content_type = u'image/jpeg'
.. doctest:: resumable-implicit-size
>>> stream = io.BytesIO(data)
>>> response = upload.initiate(
... transport, stream, metadata, content_type)
>>>
>>> upload.total_bytes == len(data)
True
If the size of the resource is **unknown** when the upload is initiated,
the ``stream_final`` argument can be used. This might occur if the
resource is being dynamically created on the client (e.g. application
logs). To use this argument:
.. testsetup:: resumable-unknown-size
import io
import mock
import requests
from six.moves import http_client
from google.resumable_media.requests import ResumableUpload
upload_url = u'http://test.invalid'
chunk_size = 3 * 1024 * 1024 # 3MB
upload = ResumableUpload(upload_url, chunk_size)
fake_response = requests.Response()
fake_response.status_code = int(http_client.OK)
fake_response._content = b''
resumable_url = u'http://test.invalid?upload_id=7up'
fake_response.headers[u'location'] = resumable_url
post_method = mock.Mock(return_value=fake_response, spec=[])
transport = mock.Mock(request=post_method, spec=['request'])
metadata = {u'name': u'some-file.jpg'}
content_type = u'application/octet-stream'
stream = io.BytesIO(b'data')
.. doctest:: resumable-unknown-size
>>> response = upload.initiate(
... transport, stream, metadata, content_type,
... stream_final=False)
>>>
>>> upload.total_bytes is None
True
Args:
upload_url (str): The URL where the resumable upload will be initiated.
chunk_size (int): The size of each chunk used to upload the resource.
headers (Optional[Mapping[str, str]]): Extra headers that should
be sent with the :meth:`initiate` request, e.g. headers for
encrypted data. These **will not** be sent with
:meth:`transmit_next_chunk` or :meth:`recover` requests.
checksum Optional([str]): 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. The corrupted file will not be deleted from the remote
host automatically. Supported values are "md5", "crc32c" and None.
The default is None.
Attributes:
upload_url (str): The URL where the content will be uploaded.
Raises:
ValueError: If ``chunk_size`` is not a multiple of
:data:`.UPLOAD_CHUNK_SIZE`.
"""
def initiate(
self,
transport,
stream,
metadata,
content_type,
total_bytes=None,
stream_final=True,
timeout=(
_request_helpers._DEFAULT_CONNECT_TIMEOUT,
_request_helpers._DEFAULT_READ_TIMEOUT,
),
):
"""Initiate a resumable upload.
By default, this method assumes your ``stream`` is in a "final"
state ready to transmit. However, ``stream_final=False`` can be used
to indicate that the size of the resource is not known. This can happen
if bytes are being dynamically fed into ``stream``, e.g. if the stream
is attached to application logs.
If ``stream_final=False`` is used, :attr:`chunk_size` bytes will be
read from the stream every time :meth:`transmit_next_chunk` is called.
If one of those reads produces strictly fewer bites than the chunk
size, the upload will be concluded.
Args:
transport (~requests.Session): A ``requests`` object which can
make authenticated requests.
stream (IO[bytes]): The stream (i.e. file-like object) that will
be uploaded. The stream **must** be at the beginning (i.e.
``stream.tell() == 0``).
metadata (Mapping[str, str]): The resource metadata, such as an
ACL list.
content_type (str): The content type of the resource, e.g. a JPEG
image has content type ``image/jpeg``.
total_bytes (Optional[int]): The total number of bytes to be
uploaded. If specified, the upload size **will not** be
determined from the stream (even if ``stream_final=True``).
stream_final (Optional[bool]): Indicates if the ``stream`` is
"final" (i.e. no more bytes will be added to it). In this case
we determine the upload size from the size of the stream. If
``total_bytes`` is passed, this argument will be ignored.
timeout (Optional[Union[float, Tuple[float, float]]]):
The number of seconds to wait for the server response.
Depending on the retry strategy, a request may be repeated
several times using the same timeout each time.
Can also be passed as a tuple (connect_timeout, read_timeout).
See :meth:`requests.Session.request` documentation for details.
Returns:
~requests.Response: The HTTP response returned by ``transport``.
"""
method, url, payload, headers = self._prepare_initiate_request(
stream,
metadata,
content_type,
total_bytes=total_bytes,
stream_final=stream_final,
)
response = _request_helpers.http_request(
transport,
method,
url,
data=payload,
headers=headers,
retry_strategy=self._retry_strategy,
timeout=timeout,
)
self._process_initiate_response(response)
return response
def transmit_next_chunk(
self,
transport,
timeout=(
_request_helpers._DEFAULT_CONNECT_TIMEOUT,
_request_helpers._DEFAULT_READ_TIMEOUT,
),
):
"""Transmit the next chunk of the resource to be uploaded.
If the current upload was initiated with ``stream_final=False``,
this method will dynamically determine if the upload has completed.
The upload will be considered complete if the stream produces
fewer than :attr:`chunk_size` bytes when a chunk is read from it.
In the case of failure, an exception is thrown that preserves the
failed response:
.. testsetup:: bad-response
import io
import mock
import requests
from six.moves import http_client
from google import resumable_media
import google.resumable_media.requests.upload as upload_mod
transport = mock.Mock(spec=['request'])
fake_response = requests.Response()
fake_response.status_code = int(http_client.BAD_REQUEST)
transport.request.return_value = fake_response
upload_url = u'http://test.invalid'
upload = upload_mod.ResumableUpload(
upload_url, resumable_media.UPLOAD_CHUNK_SIZE)
# Fake that the upload has been initiate()-d
data = b'data is here'
upload._stream = io.BytesIO(data)
upload._total_bytes = len(data)
upload._resumable_url = u'http://test.invalid?upload_id=nope'
.. doctest:: bad-response
:options: +NORMALIZE_WHITESPACE
>>> error = None
>>> try:
... upload.transmit_next_chunk(transport)
... except resumable_media.InvalidResponse as caught_exc:
... error = caught_exc
...
>>> error
InvalidResponse('Request failed with status code', 400,
'Expected one of', <HTTPStatus.OK: 200>, 308)
>>> error.response
<Response [400]>
Args:
transport (~requests.Session): A ``requests`` object which can
make authenticated requests.
timeout (Optional[Union[float, Tuple[float, float]]]):
The number of seconds to wait for the server response.
Depending on the retry strategy, a request may be repeated
several times using the same timeout each time.
Can also be passed as a tuple (connect_timeout, read_timeout).
See :meth:`requests.Session.request` documentation for details.
Returns:
~requests.Response: The HTTP response returned by ``transport``.
Raises:
~google.resumable_media.common.InvalidResponse: If the status
code is not 200 or 308.
~google.resumable_media.common.DataCorruption: If this is the final
chunk, a checksum validation was requested, and the checksum
does not match or is not available.
"""
method, url, payload, headers = self._prepare_request()
response = _request_helpers.http_request(
transport,
method,
url,
data=payload,
headers=headers,
retry_strategy=self._retry_strategy,
timeout=timeout,
)
self._process_response(response, len(payload))
return response
def recover(self, transport):
"""Recover from a failure.
This method should be used when a :class:`ResumableUpload` is in an
:attr:`~ResumableUpload.invalid` state due to a request failure.
This will verify the progress with the server and make sure the
current upload is in a valid state before :meth:`transmit_next_chunk`
can be used again.
Args:
transport (~requests.Session): A ``requests`` object which can
make authenticated requests.
Returns:
~requests.Response: The HTTP response returned by ``transport``.
"""
method, url, payload, headers = self._prepare_recover_request()
# NOTE: We assume "payload is None" but pass it along anyway.
response = _request_helpers.http_request(
transport,
method,
url,
data=payload,
headers=headers,
retry_strategy=self._retry_strategy,
)
self._process_recover_response(response)
return response