mirror of
https://github.com/SickGear/SickGear.git
synced 2024-12-02 17:33:37 +00:00
202 lines
8.1 KiB
Python
202 lines
8.1 KiB
Python
# Copyright (c) 2012 Mitch Garnaat http://garnaat.org/
|
|
# Copyright (c) 2012 Amazon.com, Inc. or its affiliates. All Rights Reserved
|
|
#
|
|
# Permission is hereby granted, free of charge, to any person obtaining a
|
|
# copy of this software and associated documentation files (the
|
|
# "Software"), to deal in the Software without restriction, including
|
|
# without limitation the rights to use, copy, modify, merge, publish, dis-
|
|
# tribute, sublicense, and/or sell copies of the Software, and to permit
|
|
# persons to whom the Software is furnished to do so, subject to the fol-
|
|
# lowing conditions:
|
|
#
|
|
# The above copyright notice and this permission notice shall be included
|
|
# in all copies or substantial portions of the Software.
|
|
#
|
|
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
|
|
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
|
|
# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
|
|
# SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
|
|
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
|
|
# IN THE SOFTWARE.
|
|
#
|
|
|
|
from boto.dynamodb.exceptions import DynamoDBItemError
|
|
|
|
|
|
class Item(dict):
|
|
"""
|
|
An item in Amazon DynamoDB.
|
|
|
|
:ivar hash_key: The HashKey of this item.
|
|
:ivar range_key: The RangeKey of this item or None if no RangeKey
|
|
is defined.
|
|
:ivar hash_key_name: The name of the HashKey associated with this item.
|
|
:ivar range_key_name: The name of the RangeKey associated with this item.
|
|
:ivar table: The Table this item belongs to.
|
|
"""
|
|
|
|
def __init__(self, table, hash_key=None, range_key=None, attrs=None):
|
|
self.table = table
|
|
self._updates = None
|
|
self._hash_key_name = self.table.schema.hash_key_name
|
|
self._range_key_name = self.table.schema.range_key_name
|
|
if attrs is None:
|
|
attrs = {}
|
|
if hash_key is None:
|
|
hash_key = attrs.get(self._hash_key_name, None)
|
|
self[self._hash_key_name] = hash_key
|
|
if self._range_key_name:
|
|
if range_key is None:
|
|
range_key = attrs.get(self._range_key_name, None)
|
|
self[self._range_key_name] = range_key
|
|
self._updates = {}
|
|
for key, value in attrs.items():
|
|
if key != self._hash_key_name and key != self._range_key_name:
|
|
self[key] = value
|
|
self.consumed_units = 0
|
|
|
|
@property
|
|
def hash_key(self):
|
|
return self[self._hash_key_name]
|
|
|
|
@property
|
|
def range_key(self):
|
|
return self.get(self._range_key_name)
|
|
|
|
@property
|
|
def hash_key_name(self):
|
|
return self._hash_key_name
|
|
|
|
@property
|
|
def range_key_name(self):
|
|
return self._range_key_name
|
|
|
|
def add_attribute(self, attr_name, attr_value):
|
|
"""
|
|
Queue the addition of an attribute to an item in DynamoDB.
|
|
This will eventually result in an UpdateItem request being issued
|
|
with an update action of ADD when the save method is called.
|
|
|
|
:type attr_name: str
|
|
:param attr_name: Name of the attribute you want to alter.
|
|
|
|
:type attr_value: int|long|float|set
|
|
:param attr_value: Value which is to be added to the attribute.
|
|
"""
|
|
self._updates[attr_name] = ("ADD", attr_value)
|
|
|
|
def delete_attribute(self, attr_name, attr_value=None):
|
|
"""
|
|
Queue the deletion of an attribute from an item in DynamoDB.
|
|
This call will result in a UpdateItem request being issued
|
|
with update action of DELETE when the save method is called.
|
|
|
|
:type attr_name: str
|
|
:param attr_name: Name of the attribute you want to alter.
|
|
|
|
:type attr_value: set
|
|
:param attr_value: A set of values to be removed from the attribute.
|
|
This parameter is optional. If None, the whole attribute is
|
|
removed from the item.
|
|
"""
|
|
self._updates[attr_name] = ("DELETE", attr_value)
|
|
|
|
def put_attribute(self, attr_name, attr_value):
|
|
"""
|
|
Queue the putting of an attribute to an item in DynamoDB.
|
|
This call will result in an UpdateItem request being issued
|
|
with the update action of PUT when the save method is called.
|
|
|
|
:type attr_name: str
|
|
:param attr_name: Name of the attribute you want to alter.
|
|
|
|
:type attr_value: int|long|float|str|set
|
|
:param attr_value: New value of the attribute.
|
|
"""
|
|
self._updates[attr_name] = ("PUT", attr_value)
|
|
|
|
def save(self, expected_value=None, return_values=None):
|
|
"""
|
|
Commits pending updates to Amazon DynamoDB.
|
|
|
|
:type expected_value: dict
|
|
:param expected_value: A dictionary of name/value pairs that
|
|
you expect. This dictionary should have name/value pairs
|
|
where the name is the name of the attribute and the value is
|
|
either the value you are expecting or False if you expect
|
|
the attribute not to exist.
|
|
|
|
:type return_values: str
|
|
:param return_values: Controls the return of attribute name/value pairs
|
|
before they were updated. Possible values are: None, 'ALL_OLD',
|
|
'UPDATED_OLD', 'ALL_NEW' or 'UPDATED_NEW'. If 'ALL_OLD' is
|
|
specified and the item is overwritten, the content of the old item
|
|
is returned. If 'ALL_NEW' is specified, then all the attributes of
|
|
the new version of the item are returned. If 'UPDATED_NEW' is
|
|
specified, the new versions of only the updated attributes are
|
|
returned.
|
|
"""
|
|
return self.table.layer2.update_item(self, expected_value,
|
|
return_values)
|
|
|
|
def delete(self, expected_value=None, return_values=None):
|
|
"""
|
|
Delete the item from DynamoDB.
|
|
|
|
:type expected_value: dict
|
|
:param expected_value: A dictionary of name/value pairs that
|
|
you expect. This dictionary should have name/value pairs
|
|
where the name is the name of the attribute and the value
|
|
is either the value you are expecting or False if you expect
|
|
the attribute not to exist.
|
|
|
|
:type return_values: str
|
|
:param return_values: Controls the return of attribute
|
|
name-value pairs before then were changed. Possible
|
|
values are: None or 'ALL_OLD'. If 'ALL_OLD' is
|
|
specified and the item is overwritten, the content
|
|
of the old item is returned.
|
|
"""
|
|
return self.table.layer2.delete_item(self, expected_value,
|
|
return_values)
|
|
|
|
def put(self, expected_value=None, return_values=None):
|
|
"""
|
|
Store a new item or completely replace an existing item
|
|
in Amazon DynamoDB.
|
|
|
|
:type expected_value: dict
|
|
:param expected_value: A dictionary of name/value pairs that
|
|
you expect. This dictionary should have name/value pairs
|
|
where the name is the name of the attribute and the value
|
|
is either the value you are expecting or False if you expect
|
|
the attribute not to exist.
|
|
|
|
:type return_values: str
|
|
:param return_values: Controls the return of attribute
|
|
name-value pairs before then were changed. Possible
|
|
values are: None or 'ALL_OLD'. If 'ALL_OLD' is
|
|
specified and the item is overwritten, the content
|
|
of the old item is returned.
|
|
"""
|
|
return self.table.layer2.put_item(self, expected_value, return_values)
|
|
|
|
def __setitem__(self, key, value):
|
|
"""Overrwrite the setter to instead update the _updates
|
|
method so this can act like a normal dict"""
|
|
if self._updates is not None:
|
|
self.put_attribute(key, value)
|
|
dict.__setitem__(self, key, value)
|
|
|
|
def __delitem__(self, key):
|
|
"""Remove this key from the items"""
|
|
if self._updates is not None:
|
|
self.delete_attribute(key)
|
|
dict.__delitem__(self, key)
|
|
|
|
# Allow this item to still be pickled
|
|
def __getstate__(self):
|
|
return self.__dict__
|
|
def __setstate__(self, d):
|
|
self.__dict__.update(d)
|