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618 lines
26 KiB
Python
618 lines
26 KiB
Python
# Copyright (c) 2006,2007 Mitch Garnaat http://garnaat.org/
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#
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# Permission is hereby granted, free of charge, to any person obtaining a
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# copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish, dis-
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# tribute, sublicense, and/or sell copies of the Software, and to permit
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# persons to whom the Software is furnished to do so, subject to the fol-
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# lowing conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
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# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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# SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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# IN THE SOFTWARE.
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import xml.sax
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import threading
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import boto
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from boto import handler
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from boto.connection import AWSQueryConnection
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from boto.sdb.domain import Domain, DomainMetaData
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from boto.sdb.item import Item
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from boto.sdb.regioninfo import SDBRegionInfo
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from boto.exception import SDBResponseError
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class ItemThread(threading.Thread):
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"""
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A threaded :class:`Item <boto.sdb.item.Item>` retriever utility class.
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Retrieved :class:`Item <boto.sdb.item.Item>` objects are stored in the
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``items`` instance variable after :py:meth:`run() <run>` is called.
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.. tip:: The item retrieval will not start until
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the :func:`run() <boto.sdb.connection.ItemThread.run>` method is called.
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"""
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def __init__(self, name, domain_name, item_names):
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"""
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:param str name: A thread name. Used for identification.
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:param str domain_name: The name of a SimpleDB
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:class:`Domain <boto.sdb.domain.Domain>`
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:type item_names: string or list of strings
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:param item_names: The name(s) of the items to retrieve from the specified
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:class:`Domain <boto.sdb.domain.Domain>`.
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:ivar list items: A list of items retrieved. Starts as empty list.
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"""
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super(ItemThread, self).__init__(name=name)
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#print 'starting %s with %d items' % (name, len(item_names))
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self.domain_name = domain_name
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self.conn = SDBConnection()
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self.item_names = item_names
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self.items = []
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def run(self):
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"""
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Start the threaded retrieval of items. Populates the
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``items`` list with :class:`Item <boto.sdb.item.Item>` objects.
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"""
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for item_name in self.item_names:
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item = self.conn.get_attributes(self.domain_name, item_name)
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self.items.append(item)
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#boto.set_stream_logger('sdb')
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class SDBConnection(AWSQueryConnection):
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"""
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This class serves as a gateway to your SimpleDB region (defaults to
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us-east-1). Methods within allow access to SimpleDB
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:class:`Domain <boto.sdb.domain.Domain>` objects and their associated
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:class:`Item <boto.sdb.item.Item>` objects.
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.. tip::
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While you may instantiate this class directly, it may be easier to
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go through :py:func:`boto.connect_sdb`.
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"""
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DefaultRegionName = 'us-east-1'
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DefaultRegionEndpoint = 'sdb.us-east-1.amazonaws.com'
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APIVersion = '2009-04-15'
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ResponseError = SDBResponseError
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def __init__(self, aws_access_key_id=None, aws_secret_access_key=None,
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is_secure=True, port=None, proxy=None, proxy_port=None,
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proxy_user=None, proxy_pass=None, debug=0,
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https_connection_factory=None, region=None, path='/',
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converter=None, security_token=None, validate_certs=True,
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profile_name=None):
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"""
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For any keywords that aren't documented, refer to the parent class,
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:py:class:`boto.connection.AWSAuthConnection`. You can avoid having
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to worry about these keyword arguments by instantiating these objects
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via :py:func:`boto.connect_sdb`.
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:type region: :class:`boto.sdb.regioninfo.SDBRegionInfo`
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:keyword region: Explicitly specify a region. Defaults to ``us-east-1``
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if not specified. You may also specify the region in your ``boto.cfg``:
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.. code-block:: cfg
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[SDB]
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region = eu-west-1
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"""
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if not region:
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region_name = boto.config.get('SDB', 'region', self.DefaultRegionName)
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for reg in boto.sdb.regions():
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if reg.name == region_name:
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region = reg
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break
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self.region = region
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super(SDBConnection, self).__init__(aws_access_key_id,
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aws_secret_access_key,
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is_secure, port, proxy,
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proxy_port, proxy_user, proxy_pass,
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self.region.endpoint, debug,
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https_connection_factory, path,
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security_token=security_token,
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validate_certs=validate_certs,
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profile_name=profile_name)
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self.box_usage = 0.0
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self.converter = converter
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self.item_cls = Item
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def _required_auth_capability(self):
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return ['sdb']
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def set_item_cls(self, cls):
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"""
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While the default item class is :py:class:`boto.sdb.item.Item`, this
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default may be overridden. Use this method to change a connection's
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item class.
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:param object cls: The new class to set as this connection's item
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class. See the default item class for inspiration as to what your
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replacement should/could look like.
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"""
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self.item_cls = cls
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def _build_name_value_list(self, params, attributes, replace=False,
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label='Attribute'):
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keys = sorted(attributes.keys())
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i = 1
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for key in keys:
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value = attributes[key]
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if isinstance(value, list):
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for v in value:
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params['%s.%d.Name' % (label, i)] = key
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if self.converter:
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v = self.converter.encode(v)
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params['%s.%d.Value' % (label, i)] = v
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if replace:
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params['%s.%d.Replace' % (label, i)] = 'true'
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i += 1
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else:
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params['%s.%d.Name' % (label, i)] = key
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if self.converter:
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value = self.converter.encode(value)
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params['%s.%d.Value' % (label, i)] = value
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if replace:
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params['%s.%d.Replace' % (label, i)] = 'true'
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i += 1
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def _build_expected_value(self, params, expected_value):
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params['Expected.1.Name'] = expected_value[0]
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if expected_value[1] is True:
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params['Expected.1.Exists'] = 'true'
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elif expected_value[1] is False:
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params['Expected.1.Exists'] = 'false'
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else:
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params['Expected.1.Value'] = expected_value[1]
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def _build_batch_list(self, params, items, replace=False):
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item_names = items.keys()
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i = 0
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for item_name in item_names:
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params['Item.%d.ItemName' % i] = item_name
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j = 0
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item = items[item_name]
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if item is not None:
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attr_names = item.keys()
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for attr_name in attr_names:
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value = item[attr_name]
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if isinstance(value, list):
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for v in value:
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if self.converter:
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v = self.converter.encode(v)
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params['Item.%d.Attribute.%d.Name' % (i, j)] = attr_name
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params['Item.%d.Attribute.%d.Value' % (i, j)] = v
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if replace:
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params['Item.%d.Attribute.%d.Replace' % (i, j)] = 'true'
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j += 1
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else:
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params['Item.%d.Attribute.%d.Name' % (i, j)] = attr_name
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if self.converter:
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value = self.converter.encode(value)
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params['Item.%d.Attribute.%d.Value' % (i, j)] = value
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if replace:
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params['Item.%d.Attribute.%d.Replace' % (i, j)] = 'true'
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j += 1
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i += 1
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def _build_name_list(self, params, attribute_names):
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i = 1
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attribute_names.sort()
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for name in attribute_names:
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params['Attribute.%d.Name' % i] = name
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i += 1
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def get_usage(self):
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"""
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Returns the BoxUsage (in USD) accumulated on this specific SDBConnection
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instance.
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.. tip:: This can be out of date, and should only be treated as a
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rough estimate. Also note that this estimate only applies to the
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requests made on this specific connection instance. It is by
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no means an account-wide estimate.
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:rtype: float
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:return: The accumulated BoxUsage of all requests made on the connection.
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"""
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return self.box_usage
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def print_usage(self):
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"""
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Print the BoxUsage and approximate costs of all requests made on
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this specific SDBConnection instance.
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.. tip:: This can be out of date, and should only be treated as a
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rough estimate. Also note that this estimate only applies to the
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requests made on this specific connection instance. It is by
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no means an account-wide estimate.
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"""
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print('Total Usage: %f compute seconds' % self.box_usage)
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cost = self.box_usage * 0.14
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print('Approximate Cost: $%f' % cost)
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def get_domain(self, domain_name, validate=True):
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"""
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Retrieves a :py:class:`boto.sdb.domain.Domain` object whose name
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matches ``domain_name``.
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:param str domain_name: The name of the domain to retrieve
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:keyword bool validate: When ``True``, check to see if the domain
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actually exists. If ``False``, blindly return a
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:py:class:`Domain <boto.sdb.domain.Domain>` object with the
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specified name set.
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:raises:
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:py:class:`boto.exception.SDBResponseError` if ``validate`` is
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``True`` and no match could be found.
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:rtype: :py:class:`boto.sdb.domain.Domain`
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:return: The requested domain
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"""
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domain = Domain(self, domain_name)
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if validate:
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self.select(domain, """select * from `%s` limit 1""" % domain_name)
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return domain
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def lookup(self, domain_name, validate=True):
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"""
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Lookup an existing SimpleDB domain. This differs from
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:py:meth:`get_domain` in that ``None`` is returned if ``validate`` is
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``True`` and no match was found (instead of raising an exception).
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:param str domain_name: The name of the domain to retrieve
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:param bool validate: If ``True``, a ``None`` value will be returned
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if the specified domain can't be found. If ``False``, a
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:py:class:`Domain <boto.sdb.domain.Domain>` object will be dumbly
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returned, regardless of whether it actually exists.
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:rtype: :class:`boto.sdb.domain.Domain` object or ``None``
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:return: The Domain object or ``None`` if the domain does not exist.
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"""
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try:
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domain = self.get_domain(domain_name, validate)
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except:
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domain = None
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return domain
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def get_all_domains(self, max_domains=None, next_token=None):
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"""
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Returns a :py:class:`boto.resultset.ResultSet` containing
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all :py:class:`boto.sdb.domain.Domain` objects associated with
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this connection's Access Key ID.
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:keyword int max_domains: Limit the returned
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:py:class:`ResultSet <boto.resultset.ResultSet>` to the specified
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number of members.
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:keyword str next_token: A token string that was returned in an
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earlier call to this method as the ``next_token`` attribute
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on the returned :py:class:`ResultSet <boto.resultset.ResultSet>`
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object. This attribute is set if there are more than Domains than
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the value specified in the ``max_domains`` keyword. Pass the
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``next_token`` value from you earlier query in this keyword to
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get the next 'page' of domains.
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"""
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params = {}
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if max_domains:
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params['MaxNumberOfDomains'] = max_domains
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if next_token:
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params['NextToken'] = next_token
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return self.get_list('ListDomains', params, [('DomainName', Domain)])
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def create_domain(self, domain_name):
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"""
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Create a SimpleDB domain.
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:type domain_name: string
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:param domain_name: The name of the new domain
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:rtype: :class:`boto.sdb.domain.Domain` object
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:return: The newly created domain
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"""
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params = {'DomainName': domain_name}
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d = self.get_object('CreateDomain', params, Domain)
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d.name = domain_name
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return d
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def get_domain_and_name(self, domain_or_name):
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"""
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Given a ``str`` or :class:`boto.sdb.domain.Domain`, return a
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``tuple`` with the following members (in order):
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* In instance of :class:`boto.sdb.domain.Domain` for the requested
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domain
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* The domain's name as a ``str``
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:type domain_or_name: ``str`` or :class:`boto.sdb.domain.Domain`
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:param domain_or_name: The domain or domain name to get the domain
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and name for.
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:raises: :class:`boto.exception.SDBResponseError` when an invalid
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domain name is specified.
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:rtype: tuple
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:return: A ``tuple`` with contents outlined as per above.
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"""
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if (isinstance(domain_or_name, Domain)):
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return (domain_or_name, domain_or_name.name)
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else:
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return (self.get_domain(domain_or_name), domain_or_name)
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def delete_domain(self, domain_or_name):
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"""
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Delete a SimpleDB domain.
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.. caution:: This will delete the domain and all items within the domain.
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:type domain_or_name: string or :class:`boto.sdb.domain.Domain` object.
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:param domain_or_name: Either the name of a domain or a Domain object
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:rtype: bool
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:return: True if successful
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"""
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domain, domain_name = self.get_domain_and_name(domain_or_name)
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params = {'DomainName': domain_name}
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return self.get_status('DeleteDomain', params)
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def domain_metadata(self, domain_or_name):
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"""
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Get the Metadata for a SimpleDB domain.
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:type domain_or_name: string or :class:`boto.sdb.domain.Domain` object.
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:param domain_or_name: Either the name of a domain or a Domain object
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:rtype: :class:`boto.sdb.domain.DomainMetaData` object
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:return: The newly created domain metadata object
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"""
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domain, domain_name = self.get_domain_and_name(domain_or_name)
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params = {'DomainName': domain_name}
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d = self.get_object('DomainMetadata', params, DomainMetaData)
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d.domain = domain
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return d
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def put_attributes(self, domain_or_name, item_name, attributes,
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replace=True, expected_value=None):
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"""
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Store attributes for a given item in a domain.
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:type domain_or_name: string or :class:`boto.sdb.domain.Domain` object.
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:param domain_or_name: Either the name of a domain or a Domain object
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:type item_name: string
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:param item_name: The name of the item whose attributes are being
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stored.
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:type attribute_names: dict or dict-like object
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:param attribute_names: The name/value pairs to store as attributes
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:type expected_value: list
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:param expected_value: If supplied, this is a list or tuple consisting
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of a single attribute name and expected value. The list can be
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of the form:
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* ['name', 'value']
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In which case the call will first verify that the attribute "name"
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of this item has a value of "value". If it does, the delete
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will proceed, otherwise a ConditionalCheckFailed error will be
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returned. The list can also be of the form:
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* ['name', True|False]
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which will simply check for the existence (True) or
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non-existence (False) of the attribute.
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:type replace: bool
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:param replace: Whether the attribute values passed in will replace
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existing values or will be added as addition values.
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Defaults to True.
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:rtype: bool
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:return: True if successful
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"""
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domain, domain_name = self.get_domain_and_name(domain_or_name)
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params = {'DomainName': domain_name,
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'ItemName': item_name}
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self._build_name_value_list(params, attributes, replace)
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if expected_value:
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self._build_expected_value(params, expected_value)
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return self.get_status('PutAttributes', params)
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def batch_put_attributes(self, domain_or_name, items, replace=True):
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"""
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Store attributes for multiple items in a domain.
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:type domain_or_name: string or :class:`boto.sdb.domain.Domain` object.
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:param domain_or_name: Either the name of a domain or a Domain object
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:type items: dict or dict-like object
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:param items: A dictionary-like object. The keys of the dictionary are
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the item names and the values are themselves dictionaries
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of attribute names/values, exactly the same as the
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attribute_names parameter of the scalar put_attributes
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call.
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:type replace: bool
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:param replace: Whether the attribute values passed in will replace
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existing values or will be added as addition values.
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Defaults to True.
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:rtype: bool
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:return: True if successful
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"""
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domain, domain_name = self.get_domain_and_name(domain_or_name)
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params = {'DomainName': domain_name}
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self._build_batch_list(params, items, replace)
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return self.get_status('BatchPutAttributes', params, verb='POST')
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def get_attributes(self, domain_or_name, item_name, attribute_names=None,
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consistent_read=False, item=None):
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"""
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Retrieve attributes for a given item in a domain.
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:type domain_or_name: string or :class:`boto.sdb.domain.Domain` object.
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:param domain_or_name: Either the name of a domain or a Domain object
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:type item_name: string
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:param item_name: The name of the item whose attributes are
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being retrieved.
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:type attribute_names: string or list of strings
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:param attribute_names: An attribute name or list of attribute names.
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This parameter is optional. If not supplied, all attributes will
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be retrieved for the item.
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:type consistent_read: bool
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:param consistent_read: When set to true, ensures that the most recent
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data is returned.
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:type item: :class:`boto.sdb.item.Item`
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:keyword item: Instead of instantiating a new Item object, you may
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specify one to update.
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:rtype: :class:`boto.sdb.item.Item`
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:return: An Item with the requested attribute name/values set on it
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"""
|
|
domain, domain_name = self.get_domain_and_name(domain_or_name)
|
|
params = {'DomainName': domain_name,
|
|
'ItemName': item_name}
|
|
if consistent_read:
|
|
params['ConsistentRead'] = 'true'
|
|
if attribute_names:
|
|
if not isinstance(attribute_names, list):
|
|
attribute_names = [attribute_names]
|
|
self.build_list_params(params, attribute_names, 'AttributeName')
|
|
response = self.make_request('GetAttributes', params)
|
|
body = response.read()
|
|
if response.status == 200:
|
|
if item is None:
|
|
item = self.item_cls(domain, item_name)
|
|
h = handler.XmlHandler(item, self)
|
|
xml.sax.parseString(body, h)
|
|
return item
|
|
else:
|
|
raise SDBResponseError(response.status, response.reason, body)
|
|
|
|
def delete_attributes(self, domain_or_name, item_name, attr_names=None,
|
|
expected_value=None):
|
|
"""
|
|
Delete attributes from a given item in a domain.
|
|
|
|
:type domain_or_name: string or :class:`boto.sdb.domain.Domain` object.
|
|
:param domain_or_name: Either the name of a domain or a Domain object
|
|
|
|
:type item_name: string
|
|
:param item_name: The name of the item whose attributes are being
|
|
deleted.
|
|
|
|
:type attributes: dict, list or :class:`boto.sdb.item.Item`
|
|
:param attributes: Either a list containing attribute names which
|
|
will cause all values associated with that attribute
|
|
name to be deleted or a dict or Item containing the
|
|
attribute names and keys and list of values to
|
|
delete as the value. If no value is supplied,
|
|
all attribute name/values for the item will be
|
|
deleted.
|
|
|
|
:type expected_value: list
|
|
:param expected_value: If supplied, this is a list or tuple consisting
|
|
of a single attribute name and expected value. The list can be
|
|
of the form:
|
|
|
|
* ['name', 'value']
|
|
|
|
In which case the call will first verify that the attribute "name"
|
|
of this item has a value of "value". If it does, the delete
|
|
will proceed, otherwise a ConditionalCheckFailed error will be
|
|
returned. The list can also be of the form:
|
|
|
|
* ['name', True|False]
|
|
|
|
which will simply check for the existence (True) or
|
|
non-existence (False) of the attribute.
|
|
|
|
:rtype: bool
|
|
:return: True if successful
|
|
"""
|
|
domain, domain_name = self.get_domain_and_name(domain_or_name)
|
|
params = {'DomainName': domain_name,
|
|
'ItemName': item_name}
|
|
if attr_names:
|
|
if isinstance(attr_names, list):
|
|
self._build_name_list(params, attr_names)
|
|
elif isinstance(attr_names, dict) or isinstance(attr_names, self.item_cls):
|
|
self._build_name_value_list(params, attr_names)
|
|
if expected_value:
|
|
self._build_expected_value(params, expected_value)
|
|
return self.get_status('DeleteAttributes', params)
|
|
|
|
def batch_delete_attributes(self, domain_or_name, items):
|
|
"""
|
|
Delete multiple items in a domain.
|
|
|
|
:type domain_or_name: string or :class:`boto.sdb.domain.Domain` object.
|
|
:param domain_or_name: Either the name of a domain or a Domain object
|
|
|
|
:type items: dict or dict-like object
|
|
:param items: A dictionary-like object. The keys of the dictionary are
|
|
the item names and the values are either:
|
|
|
|
* dictionaries of attribute names/values, exactly the
|
|
same as the attribute_names parameter of the scalar
|
|
put_attributes call. The attribute name/value pairs
|
|
will only be deleted if they match the name/value
|
|
pairs passed in.
|
|
* None which means that all attributes associated
|
|
with the item should be deleted.
|
|
|
|
:return: True if successful
|
|
"""
|
|
domain, domain_name = self.get_domain_and_name(domain_or_name)
|
|
params = {'DomainName': domain_name}
|
|
self._build_batch_list(params, items, False)
|
|
return self.get_status('BatchDeleteAttributes', params, verb='POST')
|
|
|
|
def select(self, domain_or_name, query='', next_token=None,
|
|
consistent_read=False):
|
|
"""
|
|
Returns a set of Attributes for item names within domain_name that
|
|
match the query. The query must be expressed in using the SELECT
|
|
style syntax rather than the original SimpleDB query language.
|
|
Even though the select request does not require a domain object,
|
|
a domain object must be passed into this method so the Item objects
|
|
returned can point to the appropriate domain.
|
|
|
|
:type domain_or_name: string or :class:`boto.sdb.domain.Domain` object
|
|
:param domain_or_name: Either the name of a domain or a Domain object
|
|
|
|
:type query: string
|
|
:param query: The SimpleDB query to be performed.
|
|
|
|
:type consistent_read: bool
|
|
:param consistent_read: When set to true, ensures that the most recent
|
|
data is returned.
|
|
|
|
:rtype: ResultSet
|
|
:return: An iterator containing the results.
|
|
"""
|
|
domain, domain_name = self.get_domain_and_name(domain_or_name)
|
|
params = {'SelectExpression': query}
|
|
if consistent_read:
|
|
params['ConsistentRead'] = 'true'
|
|
if next_token:
|
|
params['NextToken'] = next_token
|
|
try:
|
|
return self.get_list('Select', params, [('Item', self.item_cls)],
|
|
parent=domain)
|
|
except SDBResponseError as e:
|
|
e.body = "Query: %s\n%s" % (query, e.body)
|
|
raise e
|