2016-02-25 18:35:22 +00:00
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import json
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import logging
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import os
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2016-06-14 16:11:48 +00:00
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import socket
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2016-02-25 18:35:22 +00:00
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2016-03-02 16:38:09 +00:00
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from tornado import concurrent, httpclient, ioloop
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import tornado_aws
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from tornado_aws import exceptions as aws_exceptions
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2016-02-25 18:35:22 +00:00
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from . import utils
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2016-03-02 16:38:09 +00:00
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from . import exceptions
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2016-02-25 18:35:22 +00:00
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2016-06-23 13:32:12 +00:00
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# Stub ConnectionError && ConnectionResetError for Python 2.7
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2016-06-14 16:18:34 +00:00
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try:
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ConnectionError
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except NameError:
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class ConnectionError(Exception):
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pass
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2016-06-23 13:32:12 +00:00
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class ConnectionResetError(Exception):
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pass
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2016-02-25 18:35:22 +00:00
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LOGGER = logging.getLogger(__name__)
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class DynamoDB(object):
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"""
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Connects to a DynamoDB instance.
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:keyword str region: AWS region to send requests to
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:keyword str access_key: AWS access key. If unspecified, this
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defaults to the :envvar:`AWS_ACCESS_KEY_ID` environment
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variable and will fall back to using the AWS CLI credentials
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file. See :class:`tornado_aws.client.AsyncAWSClient` for
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more details.
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:keyword str secret_key: AWS secret used to secure API calls.
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If unspecified, this defaults to the :envvar:`AWS_SECRET_ACCESS_KEY`
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environment variable and will fall back to using the AWS CLI
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credentials as described in :class:`tornado_aws.client.AsyncAWSClient`.
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:keyword str profile: optional profile to use in AWS API calls.
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If unspecified, this defaults to the :envvar:`AWS_DEFAULT_PROFILE`
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environment variable or ``default`` if unset.
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:keyword str endpoint: DynamoDB endpoint to contact. If unspecified,
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the default is determined by the region.
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:keyword int max_clients: optional maximum number of HTTP requests
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that may be performed in parallel.
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Create an instance of this class to interact with a DynamoDB
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server. A :class:`tornado_aws.client.AsyncAWSClient` instance
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implements the AWS API wrapping and this class provides the
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DynamoDB specifics.
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"""
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def __init__(self, **kwargs):
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self.logger = LOGGER.getChild(self.__class__.__name__)
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self._client = None
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self._args = kwargs.copy()
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if os.environ.get('DYNAMODB_ENDPOINT', None):
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self._args.setdefault('endpoint', os.environ['DYNAMODB_ENDPOINT'])
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@property
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def client(self):
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if self._client is None:
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2016-03-02 16:38:09 +00:00
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self._client = tornado_aws.AsyncAWSClient('dynamodb', **self._args)
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2016-02-25 18:35:22 +00:00
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return self._client
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def execute(self, function, body):
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"""
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Invoke a DynamoDB function.
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:param str function: DynamoDB function to invoke
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:param dict body: body to send with the function
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:rtype: tornado.concurrent.Future
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This method creates a future that will resolve to the result
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of calling the specified DynamoDB function. It does it's best
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to unwrap the response from the function to make life a little
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easier for you. It does this for the ``GetItem`` and ``Query``
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functions currrently.
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2016-03-02 16:38:09 +00:00
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:raises: :exc:`~sprockets.clients.dynamodb.exceptions.DynamoDBException`
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:exc:`~sprockets.clients.dynamodb.exceptions.ConfigNotFound`
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:exc:`~sprockets.clients.dynamodb.exceptions.NoCredentialsError`
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:exc:`~sprockets.clients.dynamodb.exceptions.NoProfileError`
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:exc:`~sprockets.clients.dynamodb.exceptions.TimeoutException`
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:exc:`~sprockets.clients.dynamodb.exceptions.RequestException`
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:exc:`~sprockets.clients.dynamodb.exceptions.InternalFailure`
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:exc:`~sprockets.clients.dynamodb.exceptions.LimitExceeded`
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:exc:`~sprockets.clients.dynamodb.exceptions.MissingParameter`
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:exc:`~sprockets.clients.dynamodb.exceptions.OptInRequired`
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:exc:`~sprockets.clients.dynamodb.exceptions.ResourceInUse`
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:exc:`~sprockets.clients.dynamodb.exceptions.RequestExpired`
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:exc:`~sprockets.clients.dynamodb.exceptions.ResourceNotFound`
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:exc:`~sprockets.clients.dynamodb.exceptions.ServiceUnavailable`
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:exc:`~sprockets.clients.dynamodb.exceptions.ThroughputExceeded`
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:exc:`~sprockets.clients.dynamodb.exceptions.ValidationException`
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2016-02-25 18:35:22 +00:00
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"""
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encoded = json.dumps(body).encode('utf-8')
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headers = {
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'x-amz-target': 'DynamoDB_20120810.{}'.format(function),
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'Content-Type': 'application/x-amz-json-1.0',
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}
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future = concurrent.TracebackFuture()
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def handle_response(f):
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self.logger.debug('processing %s() = %r', function, f)
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try:
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2016-03-02 16:38:09 +00:00
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result = self._process_response(f)
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except aws_exceptions.AWSError as aws_error:
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future.set_exception(exceptions.DynamoDBException(aws_error))
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except httpclient.HTTPError as http_err:
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if http_err.code == 599:
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future.set_exception(exceptions.TimeoutException())
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else:
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2016-03-24 20:42:29 +00:00
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response_reason = str(http_err.code)
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2016-03-24 20:36:49 +00:00
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if http_err.response and \
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hasattr(http_err.response, 'body'):
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response_reason = http_err.response.body
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2016-03-24 20:42:29 +00:00
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future.set_exception(
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exceptions.RequestException(response_reason))
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2016-02-25 18:35:22 +00:00
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except Exception as exception:
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future.set_exception(exception)
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2016-03-02 16:38:09 +00:00
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else:
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future.set_result(_unwrap_result(function, result))
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2016-02-25 18:35:22 +00:00
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2016-03-02 16:38:09 +00:00
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try:
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aws_response = self.client.fetch('POST', '/', body=encoded,
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headers=headers)
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except aws_exceptions.ConfigNotFound as error:
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future.set_exception(exceptions.ConfigNotFound(str(error)))
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except aws_exceptions.ConfigParserError as error:
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future.set_exception(exceptions.ConfigParserError(str(error)))
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except aws_exceptions.NoCredentialsError as error:
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future.set_exception(exceptions.NoCredentialsError(str(error)))
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except aws_exceptions.NoProfileError as error:
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future.set_exception(exceptions.NoProfileError(str(error)))
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2016-06-23 13:32:12 +00:00
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except (ConnectionError,
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ConnectionResetError,
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OSError,
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socket.gaierror) as error:
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future.set_exception(exceptions.RequestException(str(error)))
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2016-03-02 16:38:09 +00:00
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except httpclient.HTTPError as err:
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if err.code == 599:
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future.set_exception(exceptions.TimeoutException())
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else:
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2016-03-24 20:42:29 +00:00
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reason = str(err.code)
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2016-03-24 20:36:14 +00:00
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if err.response and hasattr(err.response, 'body'):
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reason = err.response.body
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2016-03-24 20:42:29 +00:00
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future.set_exception(exceptions.RequestException(reason))
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2016-03-02 16:38:09 +00:00
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else:
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ioloop.IOLoop.current().add_future(aws_response, handle_response)
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2016-02-25 18:35:22 +00:00
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return future
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def create_table(self, table_definition):
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"""
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Invoke the ``CreateTable`` function.
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:param dict table_definition: description of the table to
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create according to `CreateTable`_
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:rtype: tornado.concurrent.Future
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.. _CreateTable: http://docs.aws.amazon.com/amazondynamodb/
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latest/APIReference/API_CreateTable.html
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2016-03-02 16:38:09 +00:00
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:raises: :exc:`~sprockets.clients.dynamodb.exceptions.DynamoDBException`
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:exc:`~sprockets.clients.dynamodb.exceptions.ConfigNotFound`
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:exc:`~sprockets.clients.dynamodb.exceptions.NoCredentialsError`
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:exc:`~sprockets.clients.dynamodb.exceptions.NoProfileError`
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:exc:`~sprockets.clients.dynamodb.exceptions.TimeoutException`
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:exc:`~sprockets.clients.dynamodb.exceptions.RequestException`
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:exc:`~sprockets.clients.dynamodb.exceptions.InternalFailure`
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:exc:`~sprockets.clients.dynamodb.exceptions.LimitExceeded`
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:exc:`~sprockets.clients.dynamodb.exceptions.MissingParameter`
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:exc:`~sprockets.clients.dynamodb.exceptions.OptInRequired`
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:exc:`~sprockets.clients.dynamodb.exceptions.ResourceInUse`
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:exc:`~sprockets.clients.dynamodb.exceptions.RequestExpired`
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:exc:`~sprockets.clients.dynamodb.exceptions.ServiceUnavailable`
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:exc:`~sprockets.clients.dynamodb.exceptions.ValidationException`
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2016-02-25 18:35:22 +00:00
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"""
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2016-03-02 16:38:09 +00:00
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future = concurrent.TracebackFuture()
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2016-02-25 18:35:22 +00:00
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2016-03-02 16:38:09 +00:00
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def handle_response(response):
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exception = response.exception()
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if exception:
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future.set_exception(exception)
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else:
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future.set_result(response.result()['TableDescription'])
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aws_response = self.execute('CreateTable', table_definition)
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ioloop.IOLoop.current().add_future(aws_response, handle_response)
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return future
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def update_table(self, table_definition):
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2016-02-25 18:35:22 +00:00
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"""
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2016-03-02 16:38:09 +00:00
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Modifies the provisioned throughput settings, global secondary
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indexes, or DynamoDB Streams settings for a given table.
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2016-02-25 18:35:22 +00:00
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2016-03-02 16:38:09 +00:00
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You can only perform one of the following operations at once:
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- Modify the provisioned throughput settings of the table.
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- Enable or disable Streams on the table.
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- Remove a global secondary index from the table.
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- Create a new global secondary index on the table. Once the index
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begins backfilling, you can use *UpdateTable* to perform other
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operations.
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*UpdateTable* is an asynchronous operation; while it is executing, the
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table status changes from ``ACTIVE`` to ``UPDATING``. While it is
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``UPDATING``, you cannot issue another *UpdateTable* request. When the
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table returns to the ``ACTIVE`` state, the *UpdateTable* operation is
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complete.
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:param dict table_definition: description of the table to
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update according to `UpdateTable`_
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2016-02-25 18:35:22 +00:00
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:rtype: tornado.concurrent.Future
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2016-03-02 16:38:09 +00:00
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:raises: :exc:`~sprockets.clients.dynamodb.exceptions.DynamoDBException`
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:exc:`~sprockets.clients.dynamodb.exceptions.ConfigNotFound`
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:exc:`~sprockets.clients.dynamodb.exceptions.NoCredentialsError`
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:exc:`~sprockets.clients.dynamodb.exceptions.NoProfileError`
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:exc:`~sprockets.clients.dynamodb.exceptions.TimeoutException`
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:exc:`~sprockets.clients.dynamodb.exceptions.RequestException`
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:exc:`~sprockets.clients.dynamodb.exceptions.InternalFailure`
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:exc:`~sprockets.clients.dynamodb.exceptions.LimitExceeded`
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:exc:`~sprockets.clients.dynamodb.exceptions.MissingParameter`
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:exc:`~sprockets.clients.dynamodb.exceptions.OptInRequired`
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:exc:`~sprockets.clients.dynamodb.exceptions.ResourceInUse`
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:exc:`~sprockets.clients.dynamodb.exceptions.RequestExpired`
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:exc:`~sprockets.clients.dynamodb.exceptions.ServiceUnavailable`
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:exc:`~sprockets.clients.dynamodb.exceptions.ValidationException`
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.. _UpdateTable: http://docs.aws.amazon.com/amazondynamodb/
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latest/APIReference/API_UpdateTable.html
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2016-02-25 18:35:22 +00:00
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"""
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raise NotImplementedError
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def delete_table(self, table_name):
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"""
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2016-03-02 16:38:09 +00:00
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Invoke the `DeleteTable`_ function. The DeleteTable operation deletes a
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table and all of its items. After a DeleteTable request, the specified
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table is in the DELETING state until DynamoDB completes the deletion.
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If the table is in the ACTIVE state, you can delete it. If a table is
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in CREATING or UPDATING states, then a
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:py:exc:`~sprockets.clients.dynamodb.exceptions.ResourceInUse`
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exception is raised. If the specified table does not exist, a
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:exc:`~sprockets.clients.dynamodb.exceptions.ResourceNotFound`
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exception is raised. If table is already in the DELETING state, no
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error is returned.
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2016-02-25 18:35:22 +00:00
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:param str table_name: name of the table to describe.
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:rtype: tornado.concurrent.Future
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2016-03-02 16:38:09 +00:00
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:returns: Response Format:
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.. code:: json
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{
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"AttributeDefinitions": [{
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"AttributeName": "string",
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"AttributeType": "string"
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}],
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"CreationDateTime": number,
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"GlobalSecondaryIndexes": [{
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"Backfilling": boolean,
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"IndexArn": "string",
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"IndexName": "string",
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"IndexSizeBytes": number,
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"IndexStatus": "string",
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"ItemCount": number,
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"KeySchema": [{
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"AttributeName": "string",
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"KeyType": "string"
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}],
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"Projection": {
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|
"NonKeyAttributes": [
|
|
|
|
|
"string"
|
|
|
|
|
],
|
|
|
|
|
"ProjectionType": "string"
|
|
|
|
|
},
|
|
|
|
|
"ProvisionedThroughput": {
|
|
|
|
|
"LastDecreaseDateTime": number,
|
|
|
|
|
"LastIncreaseDateTime": number,
|
|
|
|
|
"NumberOfDecreasesToday": number,
|
|
|
|
|
"ReadCapacityUnits": number,
|
|
|
|
|
"WriteCapacityUnits": number
|
|
|
|
|
}
|
|
|
|
|
}],
|
|
|
|
|
"ItemCount": number,
|
|
|
|
|
"KeySchema": [{
|
|
|
|
|
"AttributeName": "string",
|
|
|
|
|
"KeyType": "string"
|
|
|
|
|
}],
|
|
|
|
|
"LatestStreamArn": "string",
|
|
|
|
|
"LatestStreamLabel": "string",
|
|
|
|
|
"LocalSecondaryIndexes": [{
|
|
|
|
|
"IndexArn": "string",
|
|
|
|
|
"IndexName": "string",
|
|
|
|
|
"IndexSizeBytes": number,
|
|
|
|
|
"ItemCount": number,
|
|
|
|
|
"KeySchema": [{
|
|
|
|
|
"AttributeName": "string",
|
|
|
|
|
"KeyType": "string"
|
|
|
|
|
}],
|
|
|
|
|
"Projection": {
|
|
|
|
|
"NonKeyAttributes": [
|
|
|
|
|
"string"
|
|
|
|
|
],
|
|
|
|
|
"ProjectionType": "string"
|
|
|
|
|
}
|
|
|
|
|
}],
|
|
|
|
|
"ProvisionedThroughput": {
|
|
|
|
|
"LastDecreaseDateTime": number,
|
|
|
|
|
"LastIncreaseDateTime": number,
|
|
|
|
|
"NumberOfDecreasesToday": number,
|
|
|
|
|
"ReadCapacityUnits": number,
|
|
|
|
|
"WriteCapacityUnits": number
|
|
|
|
|
},
|
|
|
|
|
"StreamSpecification": {
|
|
|
|
|
"StreamEnabled": boolean,
|
|
|
|
|
"StreamViewType": "string"
|
|
|
|
|
},
|
|
|
|
|
"TableArn": "string",
|
|
|
|
|
"TableName": "string",
|
|
|
|
|
"TableSizeBytes": number,
|
|
|
|
|
"TableStatus": "string"
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
:raises: :exc:`~sprockets.clients.dynamodb.exceptions.DynamoDBException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ConfigNotFound`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.NoCredentialsError`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.NoProfileError`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.TimeoutException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.RequestException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.InternalFailure`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.LimitExceeded`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.MissingParameter`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.OptInRequired`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ResourceInUse`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.RequestExpired`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ServiceUnavailable`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ValidationException`
|
2016-02-25 18:35:22 +00:00
|
|
|
|
|
|
|
|
.. _DeleteTable: http://docs.aws.amazon.com/amazondynamodb/
|
|
|
|
|
latest/APIReference/API_DeleteTable.html
|
|
|
|
|
|
|
|
|
|
"""
|
|
|
|
|
return self.execute('DeleteTable', {'TableName': table_name})
|
|
|
|
|
|
2016-03-02 16:38:09 +00:00
|
|
|
def describe_table(self, table_name):
|
2016-02-25 18:35:22 +00:00
|
|
|
"""
|
2016-03-02 16:38:09 +00:00
|
|
|
Invoke the `DescribeTable`_ function.
|
2016-02-25 18:35:22 +00:00
|
|
|
|
2016-03-02 16:38:09 +00:00
|
|
|
:param str table_name: name of the table to describe.
|
2016-02-25 18:35:22 +00:00
|
|
|
:rtype: tornado.concurrent.Future
|
2016-03-02 16:38:09 +00:00
|
|
|
:returns: Response Format:
|
|
|
|
|
|
|
|
|
|
.. code:: json
|
|
|
|
|
|
|
|
|
|
{
|
|
|
|
|
"AttributeDefinitions": [{
|
|
|
|
|
"AttributeName": "string",
|
|
|
|
|
"AttributeType": "string"
|
|
|
|
|
}],
|
|
|
|
|
"CreationDateTime": number,
|
|
|
|
|
"GlobalSecondaryIndexes": [{
|
|
|
|
|
"Backfilling": boolean,
|
|
|
|
|
"IndexArn": "string",
|
|
|
|
|
"IndexName": "string",
|
|
|
|
|
"IndexSizeBytes": number,
|
|
|
|
|
"IndexStatus": "string",
|
|
|
|
|
"ItemCount": number,
|
|
|
|
|
"KeySchema": [{
|
|
|
|
|
"AttributeName": "string",
|
|
|
|
|
"KeyType": "string"
|
|
|
|
|
}],
|
|
|
|
|
"Projection": {
|
|
|
|
|
"NonKeyAttributes": [
|
|
|
|
|
"string"
|
|
|
|
|
],
|
|
|
|
|
"ProjectionType": "string"
|
|
|
|
|
},
|
|
|
|
|
"ProvisionedThroughput": {
|
|
|
|
|
"LastDecreaseDateTime": number,
|
|
|
|
|
"LastIncreaseDateTime": number,
|
|
|
|
|
"NumberOfDecreasesToday": number,
|
|
|
|
|
"ReadCapacityUnits": number,
|
|
|
|
|
"WriteCapacityUnits": number
|
|
|
|
|
}
|
|
|
|
|
}],
|
|
|
|
|
"ItemCount": number,
|
|
|
|
|
"KeySchema": [{
|
|
|
|
|
"AttributeName": "string",
|
|
|
|
|
"KeyType": "string"
|
|
|
|
|
}],
|
|
|
|
|
"LatestStreamArn": "string",
|
|
|
|
|
"LatestStreamLabel": "string",
|
|
|
|
|
"LocalSecondaryIndexes": [{
|
|
|
|
|
"IndexArn": "string",
|
|
|
|
|
"IndexName": "string",
|
|
|
|
|
"IndexSizeBytes": number,
|
|
|
|
|
"ItemCount": number,
|
|
|
|
|
"KeySchema": [{
|
|
|
|
|
"AttributeName": "string",
|
|
|
|
|
"KeyType": "string"
|
|
|
|
|
}],
|
|
|
|
|
"Projection": {
|
|
|
|
|
"NonKeyAttributes": [
|
|
|
|
|
"string"
|
|
|
|
|
],
|
|
|
|
|
"ProjectionType": "string"
|
|
|
|
|
}
|
|
|
|
|
}],
|
|
|
|
|
"ProvisionedThroughput": {
|
|
|
|
|
"LastDecreaseDateTime": number,
|
|
|
|
|
"LastIncreaseDateTime": number,
|
|
|
|
|
"NumberOfDecreasesToday": number,
|
|
|
|
|
"ReadCapacityUnits": number,
|
|
|
|
|
"WriteCapacityUnits": number
|
|
|
|
|
},
|
|
|
|
|
"StreamSpecification": {
|
|
|
|
|
"StreamEnabled": boolean,
|
|
|
|
|
"StreamViewType": "string"
|
|
|
|
|
},
|
|
|
|
|
"TableArn": "string",
|
|
|
|
|
"TableName": "string",
|
|
|
|
|
"TableSizeBytes": number,
|
|
|
|
|
"TableStatus": "string"
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
:raises: :exc:`~sprockets.clients.dynamodb.exceptions.DynamoDBException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ConfigNotFound`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.NoCredentialsError`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.NoProfileError`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.TimeoutException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.RequestException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.InternalFailure`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.LimitExceeded`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.MissingParameter`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.OptInRequired`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ResourceInUse`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.RequestExpired`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ServiceUnavailable`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ValidationException`
|
|
|
|
|
|
|
|
|
|
.. _DescribeTable: http://docs.aws.amazon.com/amazondynamodb/
|
|
|
|
|
latest/APIReference/API_DescribeTable.html
|
|
|
|
|
|
|
|
|
|
"""
|
|
|
|
|
future = concurrent.TracebackFuture()
|
|
|
|
|
|
|
|
|
|
def handle_response(response):
|
|
|
|
|
exception = response.exception()
|
|
|
|
|
if exception:
|
|
|
|
|
future.set_exception(exception)
|
|
|
|
|
else:
|
|
|
|
|
future.set_result(response.result()['Table'])
|
|
|
|
|
|
|
|
|
|
aws_response = self.execute('DescribeTable', {'TableName': table_name})
|
|
|
|
|
ioloop.IOLoop.current().add_future(aws_response, handle_response)
|
|
|
|
|
return future
|
|
|
|
|
|
|
|
|
|
def list_tables(self, exclusive_start_table_name=None, limit=None):
|
|
|
|
|
"""
|
|
|
|
|
Invoke the `ListTables`_ function.
|
|
|
|
|
|
|
|
|
|
Returns an array of table names associated with the current account
|
|
|
|
|
and endpoint. The output from *ListTables* is paginated, with each page
|
|
|
|
|
returning a maximum of ``100`` table names.
|
|
|
|
|
|
|
|
|
|
:param str exclusive_start_table_name: The first table name that this
|
|
|
|
|
operation will evaluate. Use the value that was returned for
|
|
|
|
|
``LastEvaluatedTableName`` in a previous operation, so that you can
|
|
|
|
|
obtain the next page of results.
|
|
|
|
|
:param int limit: A maximum number of table names to return. If this
|
|
|
|
|
parameter is not specified, the limit is ``100``.
|
|
|
|
|
:returns: Response Format:
|
|
|
|
|
|
|
|
|
|
.. code:: json
|
|
|
|
|
|
|
|
|
|
{
|
|
|
|
|
"LastEvaluatedTableName": "string",
|
|
|
|
|
"TableNames": [
|
|
|
|
|
"string"
|
|
|
|
|
]
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
:raises: :exc:`~sprockets.clients.dynamodb.exceptions.DynamoDBException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ConfigNotFound`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.NoCredentialsError`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.NoProfileError`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.TimeoutException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.RequestException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.InternalFailure`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.LimitExceeded`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.MissingParameter`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.OptInRequired`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ResourceInUse`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.RequestExpired`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ServiceUnavailable`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ValidationException`
|
|
|
|
|
|
|
|
|
|
.. _ListTables: http://docs.aws.amazon.com/amazondynamodb/
|
|
|
|
|
latest/APIReference/API_ListTables.html
|
|
|
|
|
|
|
|
|
|
"""
|
|
|
|
|
payload = {}
|
|
|
|
|
if exclusive_start_table_name:
|
|
|
|
|
payload['ExclusiveStartTableName'] = exclusive_start_table_name
|
|
|
|
|
if limit:
|
|
|
|
|
payload['Limit'] = limit
|
|
|
|
|
return self.execute('ListTables', payload)
|
|
|
|
|
|
|
|
|
|
def put_item(self, table_name, item, return_values=False,
|
|
|
|
|
condition_expression=None,
|
|
|
|
|
expression_attribute_names=None,
|
|
|
|
|
expression_attribute_values=None,
|
|
|
|
|
return_consumed_capacity=None,
|
|
|
|
|
return_item_collection_metrics=False):
|
|
|
|
|
"""Invoke the `PutItem`_ function, creating a new item, or replaces an
|
|
|
|
|
old item with a new item. If an item that has the same primary key as
|
|
|
|
|
the new item already exists in the specified table, the new item
|
|
|
|
|
completely replaces the existing item. You can perform a conditional
|
|
|
|
|
put operation (add a new item if one with the specified primary key
|
|
|
|
|
doesn't exist), or replace an existing item if it has certain attribute
|
|
|
|
|
values.
|
|
|
|
|
|
|
|
|
|
In addition to putting an item, you can also return the item's
|
|
|
|
|
attribute values in the same operation, using the ``return_values``
|
|
|
|
|
parameter.
|
|
|
|
|
|
|
|
|
|
When you add an item, the primary key attribute(s) are the only
|
|
|
|
|
required attributes. Attribute values cannot be null. String and Binary
|
|
|
|
|
type attributes must have lengths greater than zero. Set type
|
|
|
|
|
attributes cannot be empty. Requests with empty values will be rejected
|
|
|
|
|
with a
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ValidationException`.
|
|
|
|
|
|
|
|
|
|
You can request that PutItem return either a copy of the original item
|
|
|
|
|
(before the update) or a copy of the updated item (after the update).
|
|
|
|
|
For more information, see the ReturnValues description below.
|
|
|
|
|
|
|
|
|
|
.. note:: To prevent a new item from replacing an existing item, use a
|
|
|
|
|
conditional expression that contains the attribute_not_exists
|
|
|
|
|
function with the name of the attribute being used as the partition
|
|
|
|
|
key for the table. Since every record must contain that attribute,
|
|
|
|
|
the attribute_not_exists function will only succeed if no matching
|
|
|
|
|
item exists.
|
|
|
|
|
|
|
|
|
|
For more information about using this API, see Working with Items in
|
|
|
|
|
the Amazon DynamoDB Developer Guide.
|
|
|
|
|
|
|
|
|
|
:param str table_name: The table to put the item to
|
|
|
|
|
:param dict item: A map of attribute name/value pairs, one for each
|
|
|
|
|
attribute. Only the primary key attributes are required; you can
|
|
|
|
|
optionally provide other attribute name-value pairs for the item.
|
|
|
|
|
|
|
|
|
|
You must provide all of the attributes for the primary key. For
|
|
|
|
|
example, with a simple primary key, you only need to provide a
|
|
|
|
|
value for the partition key. For a composite primary key, you must
|
|
|
|
|
provide both values for both the partition key and the sort key.
|
|
|
|
|
|
|
|
|
|
If you specify any attributes that are part of an index key, then
|
|
|
|
|
the data types for those attributes must match those of the schema
|
|
|
|
|
in the table's attribute definition.
|
|
|
|
|
:param bool return_values: Set to ``True`` if you want to get the item
|
|
|
|
|
attributes as they appeared before they were updated with the
|
|
|
|
|
*PutItem* request.
|
|
|
|
|
:param str condition_expression: A condition that must be satisfied in
|
|
|
|
|
order for a conditional *PutItem* operation to succeed. See the
|
|
|
|
|
`AWS documentation for ConditionExpression <http://docs.aws.amazon.
|
|
|
|
|
com/amazondynamodb/latest/APIReference/API_PutItem.html#DDB-Put
|
|
|
|
|
Item-request-ConditionExpression>`_ for more information.
|
|
|
|
|
:param dict expression_attribute_names: One or more substitution tokens
|
|
|
|
|
for attribute names in an expression. See the `AWS documentation
|
|
|
|
|
for ExpressionAttributeNames <http://docs.aws.amazon.com/amazon
|
|
|
|
|
dynamodb/latest/APIReference/API_PutItem.html#DDB-PutItem-request-
|
|
|
|
|
ExpressionAttributeNames>`_ for more information.
|
|
|
|
|
:param dict expression_attribute_values: One or more values that can be
|
|
|
|
|
substituted in an expression. See the `AWS documentation
|
|
|
|
|
for ExpressionAttributeValues <http://docs.aws.amazon.com/amazon
|
|
|
|
|
dynamodb/latest/APIReference/API_PutItem.html#DDB-PutItem-request-
|
|
|
|
|
ExpressionAttributeValues>`_ for more information.
|
|
|
|
|
:param str return_consumed_capacity: Determines the level of detail
|
|
|
|
|
about provisioned throughput consumption that is returned in the
|
|
|
|
|
response. Should be ``None`` or one of ``INDEXES`` or ``TOTAL``
|
|
|
|
|
:param bool return_item_collection_metrics: Determines whether item
|
|
|
|
|
collection metrics are returned.
|
|
|
|
|
:rtype: tornado.concurrent.Future
|
|
|
|
|
|
|
|
|
|
:raises: :exc:`~sprockets.clients.dynamodb.exceptions.DynamoDBException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ConfigNotFound`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.NoCredentialsError`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.NoProfileError`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.TimeoutException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.RequestException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.InternalFailure`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.LimitExceeded`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.MissingParameter`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.OptInRequired`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ResourceInUse`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.RequestExpired`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ServiceUnavailable`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ValidationException`
|
2016-02-25 18:35:22 +00:00
|
|
|
|
|
|
|
|
.. _PutItem: http://docs.aws.amazon.com/amazondynamodb/
|
|
|
|
|
latest/APIReference/API_PutItem.html
|
|
|
|
|
|
|
|
|
|
"""
|
2016-03-02 16:38:09 +00:00
|
|
|
payload = {'TableName': table_name, 'Item': utils.marshall(item)}
|
|
|
|
|
if condition_expression:
|
|
|
|
|
payload['ConditionExpression'] = condition_expression
|
|
|
|
|
if expression_attribute_names:
|
|
|
|
|
payload['ExpressionAttributeNames'] = expression_attribute_names
|
|
|
|
|
if expression_attribute_values:
|
|
|
|
|
payload['ExpressionAttributeValues'] = expression_attribute_values
|
|
|
|
|
if return_consumed_capacity:
|
|
|
|
|
payload['ReturnConsumedCapacity'] = return_consumed_capacity
|
|
|
|
|
if return_item_collection_metrics:
|
|
|
|
|
payload['ReturnItemCollectionMetrics'] = 'SIZE'
|
|
|
|
|
if return_values:
|
|
|
|
|
payload['ReturnValues'] = 'ALL_OLD'
|
|
|
|
|
return self.execute('PutItem', payload)
|
2016-02-25 18:35:22 +00:00
|
|
|
|
2016-03-02 16:38:09 +00:00
|
|
|
def get_item(self, table_name, key_dict, consistent_read=False,
|
|
|
|
|
expression_attribute_names=None,
|
|
|
|
|
projection_expression=None, return_consumed_capacity=None):
|
2016-02-25 18:35:22 +00:00
|
|
|
"""
|
|
|
|
|
Invoke the `GetItem`_ function.
|
|
|
|
|
|
|
|
|
|
:param str table_name: table to retrieve the item from
|
|
|
|
|
:param dict key_dict: key to use for retrieval. This will
|
|
|
|
|
be marshalled for you so a native :class:`dict` works.
|
2016-03-02 16:38:09 +00:00
|
|
|
:param bool consistent_read: Determines the read consistency model: If
|
|
|
|
|
set to :py:data`True`, then the operation uses strongly consistent
|
|
|
|
|
reads; otherwise, the operation uses eventually consistent reads.
|
|
|
|
|
:param dict expression_attribute_names: One or more substitution tokens
|
|
|
|
|
for attribute names in an expression.
|
|
|
|
|
:param str projection_expression: A string that identifies one or more
|
|
|
|
|
attributes to retrieve from the table. These attributes can include
|
|
|
|
|
scalars, sets, or elements of a JSON document. The attributes in
|
|
|
|
|
the expression must be separated by commas. If no attribute names
|
|
|
|
|
are specified, then all attributes will be returned. If any of the
|
|
|
|
|
requested attributes are not found, they will not appear in the
|
|
|
|
|
result.
|
|
|
|
|
:param str return_consumed_capacity: Determines the level of detail
|
|
|
|
|
about provisioned throughput consumption that is returned in the
|
|
|
|
|
response:
|
|
|
|
|
|
|
|
|
|
- INDEXES: The response includes the aggregate consumed
|
|
|
|
|
capacity for the operation, together with consumed capacity for
|
|
|
|
|
each table and secondary index that was accessed. Note that
|
|
|
|
|
some operations, such as *GetItem* and *BatchGetItem*, do not
|
|
|
|
|
access any indexes at all. In these cases, specifying INDEXES
|
|
|
|
|
will only return consumed capacity information for table(s).
|
|
|
|
|
- TOTAL: The response includes only the aggregate consumed
|
|
|
|
|
capacity for the operation.
|
|
|
|
|
- NONE: No consumed capacity details are included in the
|
|
|
|
|
response.
|
2016-02-25 18:35:22 +00:00
|
|
|
:rtype: tornado.concurrent.Future
|
|
|
|
|
|
2016-03-02 16:38:09 +00:00
|
|
|
:raises: :exc:`~sprockets.clients.dynamodb.exceptions.DynamoDBException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ConfigNotFound`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.NoCredentialsError`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.NoProfileError`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.TimeoutException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.RequestException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.InternalFailure`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.LimitExceeded`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.MissingParameter`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.OptInRequired`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ResourceInUse`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.RequestExpired`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ResourceNotFound`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ServiceUnavailable`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ThroughputExceeded`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ValidationException`
|
|
|
|
|
|
2016-02-25 18:35:22 +00:00
|
|
|
.. _GetItem: http://docs.aws.amazon.com/amazondynamodb/
|
|
|
|
|
latest/APIReference/API_GetItem.html
|
|
|
|
|
|
|
|
|
|
"""
|
2016-03-02 16:38:09 +00:00
|
|
|
payload = {'TableName': table_name,
|
|
|
|
|
'Key': utils.marshall(key_dict),
|
|
|
|
|
'ConsistentRead': consistent_read}
|
|
|
|
|
if expression_attribute_names:
|
|
|
|
|
payload['ExpressionAttributeNames'] = expression_attribute_names
|
|
|
|
|
if projection_expression:
|
|
|
|
|
payload['ProjectionExpression'] = projection_expression
|
|
|
|
|
if return_consumed_capacity:
|
|
|
|
|
payload['ReturnConsumedCapacity'] = return_consumed_capacity
|
|
|
|
|
return self.execute('GetItem', payload)
|
|
|
|
|
|
|
|
|
|
def update_item(self, table_name, key, return_values=False,
|
|
|
|
|
condition_expression=None, update_expression=None,
|
|
|
|
|
expression_attribute_names=None,
|
|
|
|
|
expression_attribute_values=None,
|
|
|
|
|
return_consumed_capacity=None,
|
|
|
|
|
return_item_collection_metrics=False):
|
|
|
|
|
"""Invoke the `UpdateItem`_ function.
|
|
|
|
|
|
|
|
|
|
Edits an existing item's attributes, or adds a new item to the table
|
|
|
|
|
if it does not already exist. You can put, delete, or add attribute
|
|
|
|
|
values. You can also perform a conditional update on an existing item
|
|
|
|
|
(insert a new attribute name-value pair if it doesn't exist, or replace
|
|
|
|
|
an existing name-value pair if it has certain expected attribute
|
|
|
|
|
values).
|
|
|
|
|
|
|
|
|
|
:param str table_name: The name of the table that contains the item to
|
|
|
|
|
update
|
|
|
|
|
:param dict key: A dictionary of key/value pairs that are used to
|
|
|
|
|
define the primary key values for the item. For the primary key,
|
|
|
|
|
you must provide all of the attributes. For example, with a simple
|
|
|
|
|
primary key, you only need to provide a value for the partition
|
|
|
|
|
key. For a composite primary key, you must provide values for both
|
|
|
|
|
the partition key and the sort key.
|
|
|
|
|
:param bool return_values: Set to ``True`` if you want to get the item
|
|
|
|
|
attributes as they appeared before they were updated with the
|
|
|
|
|
*UpdateItem* request.
|
|
|
|
|
:param str condition_expression: A condition that must be satisfied in
|
|
|
|
|
order for a conditional *UpdateItem* operation to succeed. One of:
|
|
|
|
|
``attribute_exists``, ``attribute_not_exists``, ``attribute_type``,
|
|
|
|
|
``contains``, ``begins_with``, ``size``, ``=``, ``<>``, ``<``,
|
|
|
|
|
``>``, ``<=``, ``>=``, ``BETWEEN``, ``IN``, ``AND``, ``OR``, or
|
|
|
|
|
``NOT``.
|
|
|
|
|
:param str update_expression: An expression that defines one or more
|
|
|
|
|
attributes to be updated, the action to be performed on them, and
|
|
|
|
|
new value(s) for them.
|
|
|
|
|
:param dict expression_attribute_names: One or more substitution tokens
|
|
|
|
|
for attribute names in an expression.
|
|
|
|
|
:param dict expression_attribute_values: One or more values that can be
|
|
|
|
|
substituted in an expression.
|
|
|
|
|
:param str return_consumed_capacity: Determines the level of detail
|
|
|
|
|
about provisioned throughput consumption that is returned in the
|
|
|
|
|
response. Should be ``None`` or one of ``INDEXES`` or ``TOTAL``
|
|
|
|
|
:param bool return_item_collection_metrics: Determines whether item
|
|
|
|
|
collection metrics are returned.
|
|
|
|
|
:rtype: dict
|
|
|
|
|
|
|
|
|
|
:raises: :exc:`~sprockets.clients.dynamodb.exceptions.DynamoDBException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ConfigNotFound`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.NoCredentialsError`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.NoProfileError`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.TimeoutException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.RequestException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.InternalFailure`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.LimitExceeded`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.MissingParameter`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.OptInRequired`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ResourceInUse`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.RequestExpired`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ResourceNotFound`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ServiceUnavailable`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ThroughputExceeded`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ValidationException`
|
|
|
|
|
|
2016-03-04 14:35:43 +00:00
|
|
|
.. _UpdateItem: http://docs.aws.amazon.com/amazondynamodb/
|
2016-03-02 16:38:09 +00:00
|
|
|
latest/APIReference/API_UpdateItem.html
|
|
|
|
|
|
|
|
|
|
"""
|
|
|
|
|
raise NotImplementedError
|
|
|
|
|
|
|
|
|
|
def delete_item(self, table_name, key, condition_expression=None,
|
|
|
|
|
expression_attribute_names=None,
|
|
|
|
|
expression_attribute_values=None,
|
|
|
|
|
return_consumed_capacity=None,
|
|
|
|
|
return_item_collection_metrics=False,
|
|
|
|
|
return_values=False):
|
|
|
|
|
"""Invoke the `DeleteItem`_ function that deletes a single item in a
|
|
|
|
|
table by primary key. You can perform a conditional delete operation
|
|
|
|
|
that deletes the item if it exists, or if it has an expected attribute
|
|
|
|
|
value.
|
|
|
|
|
|
|
|
|
|
In addition to deleting an item, you can also return the item's
|
|
|
|
|
attribute values in the same operation, using the ``return_values``
|
|
|
|
|
parameter.
|
|
|
|
|
|
|
|
|
|
Unless you specify conditions, the *DeleteItem* is an idempotent
|
|
|
|
|
operation; running it multiple times on the same item or attribute does
|
|
|
|
|
not result in an error response.
|
|
|
|
|
|
|
|
|
|
Conditional deletes are useful for deleting items only if specific
|
|
|
|
|
conditions are met. If those conditions are met, DynamoDB performs the
|
|
|
|
|
delete. Otherwise, the item is not deleted.
|
|
|
|
|
|
|
|
|
|
:param str table_name: The name of the table from which to delete the
|
|
|
|
|
item.
|
|
|
|
|
:param dict key: A map of attribute names to ``AttributeValue``
|
|
|
|
|
objects, representing the primary key of the item to delete. For
|
|
|
|
|
the primary key, you must provide all of the attributes. For
|
|
|
|
|
example, with a simple primary key, you only need to provide a
|
|
|
|
|
value for the partition key. For a composite primary key, you must
|
|
|
|
|
provide values for both the partition key and the sort key.
|
|
|
|
|
:param str condition_expression: A condition that must be satisfied in
|
|
|
|
|
order for a conditional *DeleteItem* to succeed. See the `AWS
|
|
|
|
|
documentation for ConditionExpression <http://docs.aws.amazon.com/
|
|
|
|
|
amazondynamodb/latest/APIReference/API_DeleteItem.html#DDB-Delete
|
|
|
|
|
Item-request-ConditionExpression>`_ for more information.
|
|
|
|
|
:param dict expression_attribute_names: One or more substitution tokens
|
|
|
|
|
for attribute names in an expression. See the `AWS documentation
|
|
|
|
|
for ExpressionAttributeNames <http://docs.aws.amazon.com/
|
|
|
|
|
amazondynamodb/latest/APIReference/API_DeleteItem.html#DDB-Delete
|
|
|
|
|
Item-request-ExpressionAttributeNames>`_ for more information.
|
|
|
|
|
:param dict expression_attribute_values: One or more values that can be
|
|
|
|
|
substituted in an expression. See the `AWS documentation
|
|
|
|
|
for ExpressionAttributeValues <http://docs.aws.amazon.com/
|
|
|
|
|
amazondynamodb/latest/APIReference/API_DeleteItem.html#DDB-Delete
|
|
|
|
|
Item-request-ExpressionAttributeValues>`_ for more information.
|
|
|
|
|
:param str return_consumed_capacity: Determines the level of detail
|
|
|
|
|
about provisioned throughput consumption that is returned in the
|
|
|
|
|
response. See the `AWS documentation
|
|
|
|
|
for ReturnConsumedCapacity <http://docs.aws.amazon.com/
|
|
|
|
|
amazondynamodb/latest/APIReference/API_DeleteItem.html#DDB-Delete
|
|
|
|
|
Item-request-ReturnConsumedCapacity>`_ for more information.
|
|
|
|
|
:param bool return_item_collection_metrics: Determines whether item
|
|
|
|
|
collection metrics are returned.
|
|
|
|
|
:param bool return_values: Return the item attributes as they appeared
|
|
|
|
|
before they were deleted.
|
|
|
|
|
:returns: Response format:
|
|
|
|
|
|
|
|
|
|
.. code:: json
|
|
|
|
|
|
|
|
|
|
{
|
|
|
|
|
"Attributes": {
|
|
|
|
|
"string": {
|
|
|
|
|
"B": blob,
|
|
|
|
|
"BOOL": boolean,
|
|
|
|
|
"BS": [
|
|
|
|
|
blob
|
|
|
|
|
],
|
|
|
|
|
"L": [
|
|
|
|
|
AttributeValue
|
|
|
|
|
],
|
|
|
|
|
"M": {
|
|
|
|
|
"string": AttributeValue
|
|
|
|
|
},
|
|
|
|
|
"N": "string",
|
|
|
|
|
"NS": [
|
|
|
|
|
"string"
|
|
|
|
|
],
|
|
|
|
|
"NULL": boolean,
|
|
|
|
|
"S": "string",
|
|
|
|
|
"SS": [
|
|
|
|
|
"string"
|
|
|
|
|
]
|
|
|
|
|
}
|
|
|
|
|
},
|
|
|
|
|
"ConsumedCapacity": {
|
|
|
|
|
"CapacityUnits": number,
|
|
|
|
|
"GlobalSecondaryIndexes": {
|
|
|
|
|
"string": {
|
|
|
|
|
"CapacityUnits": number
|
|
|
|
|
}
|
|
|
|
|
},
|
|
|
|
|
"LocalSecondaryIndexes": {
|
|
|
|
|
"string": {
|
|
|
|
|
"CapacityUnits": number
|
|
|
|
|
}
|
|
|
|
|
},
|
|
|
|
|
"Table": {
|
|
|
|
|
"CapacityUnits": number
|
|
|
|
|
},
|
|
|
|
|
"TableName": "string"
|
|
|
|
|
},
|
|
|
|
|
"ItemCollectionMetrics": {
|
|
|
|
|
"ItemCollectionKey": {
|
|
|
|
|
"string": {
|
|
|
|
|
"B": blob,
|
|
|
|
|
"BOOL": boolean,
|
|
|
|
|
"BS": [
|
|
|
|
|
blob
|
|
|
|
|
],
|
|
|
|
|
"L": [
|
|
|
|
|
AttributeValue
|
|
|
|
|
],
|
|
|
|
|
"M": {
|
|
|
|
|
"string": AttributeValue
|
|
|
|
|
},
|
|
|
|
|
"N": "string",
|
|
|
|
|
"NS": [
|
|
|
|
|
"string"
|
|
|
|
|
],
|
|
|
|
|
"NULL": boolean,
|
|
|
|
|
"S": "string",
|
|
|
|
|
"SS": [
|
|
|
|
|
"string"
|
|
|
|
|
]
|
|
|
|
|
}
|
|
|
|
|
},
|
|
|
|
|
"SizeEstimateRangeGB": [
|
|
|
|
|
number
|
|
|
|
|
]
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
:raises: :exc:`~sprockets.clients.dynamodb.exceptions.DynamoDBException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ConfigNotFound`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.NoCredentialsError`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.NoProfileError`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.TimeoutException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.RequestException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.InternalFailure`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.LimitExceeded`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.MissingParameter`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.OptInRequired`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ResourceInUse`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.RequestExpired`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ResourceNotFound`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ServiceUnavailable`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ThroughputExceeded`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ValidationException`
|
|
|
|
|
|
2016-03-04 14:35:43 +00:00
|
|
|
.. _DeleteItem: http://docs.aws.amazon.com/amazondynamodb/
|
2016-03-02 16:38:09 +00:00
|
|
|
latest/APIReference/API_DeleteItem.html
|
|
|
|
|
|
|
|
|
|
"""
|
|
|
|
|
raise NotImplementedError
|
|
|
|
|
|
|
|
|
|
def batch_get_item(self):
|
|
|
|
|
"""Invoke the `BatchGetItem`_ function.
|
|
|
|
|
|
|
|
|
|
:raises: :exc:`~sprockets.clients.dynamodb.exceptions.DynamoDBException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ConfigNotFound`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.NoCredentialsError`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.NoProfileError`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.TimeoutException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.RequestException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.InternalFailure`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.LimitExceeded`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.MissingParameter`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.OptInRequired`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ResourceInUse`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.RequestExpired`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ResourceNotFound`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ServiceUnavailable`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ThroughputExceeded`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ValidationException`
|
|
|
|
|
|
2016-03-04 14:35:43 +00:00
|
|
|
.. _BatchGetItem: http://docs.aws.amazon.com/amazondynamodb/
|
2016-03-02 16:38:09 +00:00
|
|
|
latest/APIReference/API_BatchGetItem.html
|
|
|
|
|
|
|
|
|
|
"""
|
|
|
|
|
raise NotImplementedError
|
|
|
|
|
|
|
|
|
|
def batch_write_item(self):
|
|
|
|
|
"""Invoke the `BatchWriteItem`_ function.
|
|
|
|
|
|
|
|
|
|
:raises: :exc:`~sprockets.clients.dynamodb.exceptions.DynamoDBException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ConfigNotFound`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.NoCredentialsError`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.NoProfileError`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.TimeoutException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.RequestException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.InternalFailure`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.LimitExceeded`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.MissingParameter`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.OptInRequired`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ResourceInUse`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.RequestExpired`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ResourceNotFound`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ServiceUnavailable`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ThroughputExceeded`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ValidationException`
|
|
|
|
|
|
2016-03-04 14:35:43 +00:00
|
|
|
.. _BatchWriteItem: http://docs.aws.amazon.com/amazondynamodb/
|
2016-03-02 16:38:09 +00:00
|
|
|
latest/APIReference/API_BatchWriteItem.html
|
|
|
|
|
|
|
|
|
|
"""
|
|
|
|
|
raise NotImplementedError
|
|
|
|
|
|
|
|
|
|
def query(self, table_name, consistent_read=False,
|
|
|
|
|
exclusive_start_key=None, expression_attribute_names=None,
|
|
|
|
|
expression_attribute_values=None, filter_expression=None,
|
|
|
|
|
projection_expression=None, index_name=None,limit=None,
|
|
|
|
|
return_consumed_capacity=None, scan_index_forward=True,
|
|
|
|
|
select=None):
|
|
|
|
|
"""A `Query`_ operation uses the primary key of a table or a secondary
|
|
|
|
|
index to directly access items from that table or index.
|
|
|
|
|
|
|
|
|
|
You can use the ``scan_index_forward`` parameter to get results in
|
|
|
|
|
forward or reverse order, by sort key.
|
|
|
|
|
|
|
|
|
|
Queries that do not return results consume the minimum number of read
|
|
|
|
|
capacity units for that type of read operation.
|
|
|
|
|
|
|
|
|
|
If the total number of items meeting the query criteria exceeds the
|
|
|
|
|
result set size limit of 1 MB, the query stops and results are returned
|
|
|
|
|
to the user with the ``LastEvaluatedKey`` element to continue the query
|
|
|
|
|
in a subsequent operation. Unlike a *Scan* operation, a Query operation
|
|
|
|
|
never returns both an empty result set and a ``LastEvaluatedKey``
|
|
|
|
|
value. ``LastEvaluatedKey`` is only provided if the results exceed
|
|
|
|
|
1 MB, or if you have used the ``limit`` parameter.
|
|
|
|
|
|
|
|
|
|
You can query a table, a local secondary index, or a global secondary
|
|
|
|
|
index. For a query on a table or on a local secondary index, you can
|
|
|
|
|
set the ``consistent_read`` parameter to true and obtain a strongly
|
|
|
|
|
consistent result. Global secondary indexes support eventually
|
|
|
|
|
consistent reads only, so do not specify ``consistent_read`` when
|
|
|
|
|
querying a global secondary index.
|
|
|
|
|
|
|
|
|
|
:param str table_name: The name of the table containing the requested
|
|
|
|
|
items.
|
|
|
|
|
:param bool consistent_read: Determines the read consistency model: If
|
|
|
|
|
set to ``True``, then the operation uses strongly consistent reads;
|
|
|
|
|
otherwise, the operation uses eventually consistent reads. Strongly
|
|
|
|
|
consistent reads are not supported on global secondary indexes. If
|
|
|
|
|
you query a global secondary index with ``consistent_read`` set to
|
|
|
|
|
``True``, you will receive a
|
|
|
|
|
:exc:`~tornado_dynamodb.exceptions.ValidationException`.
|
|
|
|
|
:param str|bytes|int exclusive_start_key: The primary key of the first
|
|
|
|
|
item that this operation will evaluate. Use the value that was
|
|
|
|
|
returned for ``LastEvaluatedKey`` in the previous operation. In a
|
|
|
|
|
parallel scan, a *Scan* request that includes
|
|
|
|
|
``exclusive_start_key`` must specify the same segment whose
|
|
|
|
|
previous *Scan* returned the corresponding value of
|
|
|
|
|
``LastEvaluatedKey``.
|
|
|
|
|
:param dict expression_attribute_names: One or more substitution tokens
|
|
|
|
|
for attribute names in an expression.
|
|
|
|
|
:param dict expression_attribute_values: One or more values that can be
|
|
|
|
|
substituted in an expression.
|
|
|
|
|
:param str filter_expression: A string that contains conditions that
|
|
|
|
|
DynamoDB applies after the *Query* operation, but before the data
|
|
|
|
|
is returned to you. Items that do not satisfy the criteria are not
|
|
|
|
|
returned. Note that a filter expression is applied after the items
|
|
|
|
|
have already been read; the process of filtering does not consume
|
|
|
|
|
any additional read capacity units. For more information, see
|
|
|
|
|
`Filter Expressions <http://docs.aws.amazon.com/amazondynamodb/
|
|
|
|
|
latest/developerguide/QueryAndScan.html#FilteringResults>`_ in the
|
|
|
|
|
Amazon DynamoDB Developer Guide.
|
|
|
|
|
:param str projection_expression:
|
|
|
|
|
:param str index_name: The name of a secondary index to query. This
|
|
|
|
|
index can be any local secondary index or global secondary index.
|
|
|
|
|
Note that if you use this parameter, you must also provide
|
|
|
|
|
``table_name``.
|
|
|
|
|
:param int limit: The maximum number of items to evaluate (not
|
|
|
|
|
necessarily the number of matching items). If DynamoDB processes
|
|
|
|
|
the number of items up to the limit while processing the results,
|
|
|
|
|
it stops the operation and returns the matching values up to that
|
|
|
|
|
point, and a key in ``LastEvaluatedKey`` to apply in a subsequent
|
|
|
|
|
operation, so that you can pick up where you left off. Also, if the
|
|
|
|
|
processed data set size exceeds 1 MB before DynamoDB reaches this
|
|
|
|
|
limit, it stops the operation and returns the matching values up to
|
|
|
|
|
the limit, and a key in ``LastEvaluatedKey`` to apply in a
|
|
|
|
|
subsequent operation to continue the operation. For more
|
|
|
|
|
information, see `Query and Scan <http://docs.aws.amazon.com/amazo
|
|
|
|
|
ndynamodb/latest/developerguide/QueryAndScan.html>`_ in the Amazon
|
|
|
|
|
DynamoDB Developer Guide.
|
|
|
|
|
:param str return_consumed_capacity: Determines the level of detail
|
|
|
|
|
about provisioned throughput consumption that is returned in the
|
|
|
|
|
response:
|
|
|
|
|
|
|
|
|
|
- ``INDEXES``: The response includes the aggregate consumed
|
|
|
|
|
capacity for the operation, together with consumed capacity for
|
|
|
|
|
each table and secondary index that was accessed. Note that
|
|
|
|
|
some operations, such as *GetItem* and *BatchGetItem*, do not
|
|
|
|
|
access any indexes at all. In these cases, specifying
|
|
|
|
|
``INDEXES`` will only return consumed capacity information for
|
|
|
|
|
table(s).
|
|
|
|
|
- ``TOTAL``: The response includes only the aggregate consumed
|
|
|
|
|
capacity for the operation.
|
|
|
|
|
- ``NONE``: No consumed capacity details are included in the
|
|
|
|
|
response.
|
|
|
|
|
:param bool scan_index_forward: Specifies the order for index
|
|
|
|
|
traversal: If ``True`` (default), the traversal is performed in
|
|
|
|
|
ascending order; if ``False``, the traversal is performed in
|
|
|
|
|
descending order. Items with the same partition key value are
|
|
|
|
|
stored in sorted order by sort key. If the sort key data type is
|
|
|
|
|
*Number*, the results are stored in numeric order. For type
|
|
|
|
|
*String*, the results are stored in order of ASCII character code
|
|
|
|
|
values. For type *Binary*, DynamoDB treats each byte of the binary
|
|
|
|
|
data as unsigned. If set to ``True``, DynamoDB returns the results
|
|
|
|
|
in the order in which they are stored (by sort key value). This is
|
|
|
|
|
the default behavior. If set to ``False``, DynamoDB reads the
|
|
|
|
|
results in reverse order by sort key value, and then returns the
|
|
|
|
|
results to the client.
|
|
|
|
|
:param str select: The attributes to be returned in the result. You can
|
|
|
|
|
retrieve all item attributes, specific item attributes, the count
|
|
|
|
|
of matching items, or in the case of an index, some or all of the
|
|
|
|
|
attributes projected into the index. Possible values are:
|
|
|
|
|
|
|
|
|
|
- ``ALL_ATTRIBUTES``: Returns all of the item attributes from the
|
|
|
|
|
specified table or index. If you query a local secondary index,
|
|
|
|
|
then for each matching item in the index DynamoDB will fetch
|
|
|
|
|
the entire item from the parent table. If the index is
|
|
|
|
|
configured to project all item attributes, then all of the data
|
|
|
|
|
can be obtained from the local secondary index, and no fetching
|
|
|
|
|
is required.
|
|
|
|
|
- ``ALL_PROJECTED_ATTRIBUTES``: Allowed only when querying an
|
|
|
|
|
index. Retrieves all attributes that have been projected into
|
|
|
|
|
the index. If the index is configured to project all
|
|
|
|
|
attributes, this return value is equivalent to specifying
|
|
|
|
|
``ALL_ATTRIBUTES``.
|
|
|
|
|
- ``COUNT``: Returns the number of matching items, rather than
|
|
|
|
|
the matching items themselves.
|
|
|
|
|
:rtype: dict
|
|
|
|
|
|
|
|
|
|
:raises: :exc:`~sprockets.clients.dynamodb.exceptions.DynamoDBException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ConfigNotFound`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.NoCredentialsError`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.NoProfileError`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.TimeoutException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.RequestException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.InternalFailure`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.LimitExceeded`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.MissingParameter`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.OptInRequired`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ResourceInUse`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.RequestExpired`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ResourceNotFound`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ServiceUnavailable`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ThroughputExceeded`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ValidationException`
|
|
|
|
|
|
|
|
|
|
.. _Query: http://docs.aws.amazon.com/amazondynamodb/
|
|
|
|
|
latest/APIReference/API_Query.html
|
|
|
|
|
|
|
|
|
|
"""
|
|
|
|
|
raise NotImplementedError
|
|
|
|
|
|
|
|
|
|
def scan(self, table_name, consistent_read=False, exclusive_start_key=None,
|
|
|
|
|
expression_attribute_names=None, expression_attribute_values=None,
|
|
|
|
|
filter_expression=None, projection_expression=None,
|
|
|
|
|
index_name=None, limit=None, return_consumed_capacity=None,
|
|
|
|
|
segment=None, total_segments=None):
|
|
|
|
|
"""The `Scan`_ operation returns one or more items and item attributes
|
|
|
|
|
by accessing every item in a table or a secondary index.
|
|
|
|
|
|
|
|
|
|
If the total number of scanned items exceeds the maximum data set size
|
|
|
|
|
limit of 1 MB, the scan stops and results are returned to the user as a
|
|
|
|
|
``LastEvaluatedKey`` value to continue the scan in a subsequent
|
|
|
|
|
operation. The results also include the number of items exceeding the
|
|
|
|
|
limit. A scan can result in no table data meeting the filter criteria.
|
|
|
|
|
|
|
|
|
|
By default, Scan operations proceed sequentially; however, for faster
|
|
|
|
|
performance on a large table or secondary index, applications can
|
|
|
|
|
request a parallel *Scan* operation by providing the ``segment`` and
|
|
|
|
|
``total_segments`` parameters. For more information, see
|
|
|
|
|
`Parallel Scan <http://docs.aws.amazon.com/amazondynamodb/latest/
|
|
|
|
|
developerguide/QueryAndScan.html#QueryAndScanParallelScan>`_ in the
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Amazon DynamoDB Developer Guide.
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By default, *Scan* uses eventually consistent reads when accessing the
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|
data in a table; therefore, the result set might not include the
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changes to data in the table immediately before the operation began. If
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you need a consistent copy of the data, as of the time that the *Scan*
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begins, you can set the ``consistent_read`` parameter to ``True``.
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:param str table_name: The name of the table containing the requested
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items; or, if you provide IndexName, the name of the table to which
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that index belongs.
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:param bool consistent_read: A Boolean value that determines the read
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consistency model during the scan:
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- If set to ``False``, then the data returned from *Scan* might not
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contain the results from other recently completed write
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operations (*PutItem*, *UpdateItem*, or *DeleteItem*).
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- If set to ``True``, then all of the write operations that
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completed before the Scan began are guaranteed to be contained in
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the *Scan* response.
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The default setting is ``False``.
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This parameter is not supported on global secondary indexes. If you
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scan a global secondary index and set ``consistent_read`` to
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``true``, you will receive a
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:exc:`~tornado_dynamodb.exceptions.ValidationException`.
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:param str|bytes|int exclusive_start_key: The primary key of the first
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item that this operation will evaluate. Use the value that was
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returned for ``LastEvaluatedKey`` in the previous operation.
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In a parallel scan, a *Scan* request that includes
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``exclusive_start_key`` must specify the same segment whose
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previous *Scan* returned the corresponding value of
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``LastEvaluatedKey``.
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:param dict expression_attribute_names: One or more substitution tokens
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for attribute names in an expression.
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:param dict expression_attribute_values: One or more values that can be
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substituted in an expression.
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:param str filter_expression: A string that contains conditions that
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DynamoDB applies after the Scan operation, but before the data is
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returned to you. Items that do not satisfy the expression criteria
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are not returned.
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.. note:: A filter expression is applied after the items have
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already been read; the process of filtering does not consume
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any additional read capacity units.
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For more information, see `Filter Expressions <http://docs.aws.
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|
amazon.com/amazondynamodb/latest/developerguide/QueryAndScan.html
|
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|
#FilteringResults>`_ in the Amazon DynamoDB Developer Guide.
|
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|
:param str projection_expression: A string that identifies one or more
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|
attributes to retrieve from the specified table or index. These
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attributes can include scalars, sets, or elements of a JSON
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document. The attributes in the expression must be separated by
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commas.
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If no attribute names are specified, then all attributes will be
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returned. If any of the requested attributes are not found, they
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will not appear in the result.
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For more information, see `Accessing Item Attributes <http://docs.
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|
aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.
|
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|
AccessingItemAttributes.html>`_ in the Amazon DynamoDB Developer
|
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|
Guide.
|
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|
:param str index_name: The name of a secondary index to scan. This
|
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|
|
index can be any local secondary index or global secondary index.
|
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|
|
Note that if you use this parameter, you must also provide
|
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|
``table_name``.
|
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|
:param int limit: The maximum number of items to evaluate (not
|
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|
|
necessarily the number of matching items). If DynamoDB processes
|
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|
the number of items up to the limit while processing the results,
|
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|
it stops the operation and returns the matching values up to that
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|
point, and a key in ``LastEvaluatedKey`` to apply in a subsequent
|
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|
|
operation, so that you can pick up where you left off. Also, if the
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|
|
processed data set size exceeds 1 MB before DynamoDB reaches this
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|
limit, it stops the operation and returns the matching values up to
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|
|
the limit, and a key in ``LastEvaluatedKey`` to apply in a
|
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|
|
subsequent operation to continue the operation. For more
|
|
|
|
|
information, see `Query and Scan <http://docs.aws.amazon.com/amazo
|
|
|
|
|
ndynamodb/latest/developerguide/QueryAndScan.html>`_ in the Amazon
|
|
|
|
|
DynamoDB Developer Guide.
|
|
|
|
|
:param str return_consumed_capacity: Determines the level of detail
|
|
|
|
|
about provisioned throughput consumption that is returned in the
|
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|
|
|
response. Should be ``None`` or one of ``INDEXES`` or ``TOTAL``
|
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|
|
|
:param int segment: For a parallel *Scan* request, ``segment``
|
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|
|
|
identifies an individual segment to be scanned by an application
|
|
|
|
|
worker.
|
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|
|
Segment IDs are zero-based, so the first segment is always ``0``.
|
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|
|
For example, if you want to use four application threads to scan a
|
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|
|
|
table or an index, then the first thread specifies a Segment value
|
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|
|
of ``0``, the second thread specifies ``1``, and so on.
|
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|
|
|
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|
|
The value of ``LastEvaluatedKey`` returned from a parallel *Scan*
|
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|
|
|
request must be used as ``ExclusiveStartKey`` with the same segment
|
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|
|
|
ID in a subsequent *Scan* operation.
|
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|
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|
The value for ``segment`` must be greater than or equal to ``0``,
|
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|
|
and less than the value provided for ``total_segments``.
|
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|
|
|
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|
|
|
|
If you provide ``segment``, you must also provide
|
|
|
|
|
``total_segments``.
|
|
|
|
|
:param int total_segments: For a parallel *Scan* request,
|
|
|
|
|
``total_segments`` represents the total number of segments into
|
|
|
|
|
which the *Scan* operation will be divided. The value of
|
|
|
|
|
``total_segments`` corresponds to the number of application workers
|
|
|
|
|
that will perform the parallel scan. For example, if you want to
|
|
|
|
|
use four application threads to scan a table or an index, specify a
|
|
|
|
|
``total_segments`` value of 4.
|
|
|
|
|
|
|
|
|
|
The value for ``total_segments`` must be greater than or equal to
|
|
|
|
|
``1``, and less than or equal to ``1000000``. If you specify a
|
|
|
|
|
``total_segments`` value of ``1``, the *Scan* operation will be
|
|
|
|
|
sequential rather than parallel.
|
|
|
|
|
|
|
|
|
|
If you specify ``total_segments``, you must also specify
|
|
|
|
|
``segments``.
|
|
|
|
|
:rtype: dict
|
|
|
|
|
|
|
|
|
|
:raises: :exc:`~sprockets.clients.dynamodb.exceptions.DynamoDBException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ConfigNotFound`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.NoCredentialsError`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.NoProfileError`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.TimeoutException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.RequestException`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.InternalFailure`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.LimitExceeded`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.MissingParameter`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.OptInRequired`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ResourceInUse`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.RequestExpired`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ResourceNotFound`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ServiceUnavailable`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ThroughputExceeded`
|
|
|
|
|
:exc:`~sprockets.clients.dynamodb.exceptions.ValidationException`
|
|
|
|
|
|
|
|
|
|
.. _Scan: http://docs.aws.amazon.com/amazondynamodb/
|
|
|
|
|
latest/APIReference/API_Scan.html
|
|
|
|
|
|
|
|
|
|
"""
|
|
|
|
|
raise NotImplementedError
|
|
|
|
|
|
|
|
|
|
@staticmethod
|
|
|
|
|
def _process_response(response):
|
|
|
|
|
error = response.exception()
|
|
|
|
|
if error:
|
|
|
|
|
if isinstance(error, aws_exceptions.AWSError):
|
|
|
|
|
if error.args[1]['type'] in exceptions.MAP:
|
|
|
|
|
raise exceptions.MAP[error.args[1]['type']](
|
|
|
|
|
error.args[1]['message'])
|
|
|
|
|
raise error
|
|
|
|
|
http_response = response.result()
|
|
|
|
|
if not http_response or not http_response.body:
|
|
|
|
|
raise exceptions.DynamoDBException('empty response')
|
|
|
|
|
return json.loads(http_response.body.decode('utf-8'))
|
2016-02-25 18:35:22 +00:00
|
|
|
|
|
|
|
|
|
|
|
|
|
def _unwrap_result(function, result):
|
|
|
|
|
if result:
|
|
|
|
|
if function == 'GetItem':
|
|
|
|
|
return utils.unmarshall(result['Item'])
|
|
|
|
|
if function == 'Query':
|
|
|
|
|
return [utils.unmarshall(item) for item in result['Items']]
|
|
|
|
|
return result
|
