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# Copyright (c) 2006,2007 Mitch Garnaat http://garnaat.org/
#
# 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.
"""
Represents an SDB Domain
"""
from boto.sdb.queryresultset import SelectResultSet
class Domain:
def __init__(self, connection=None, name=None):
self.connection = connection
self.name = name
self._metadata = None
def __repr__(self):
return 'Domain:%s' % self.name
def __iter__(self):
return iter(self.select("SELECT * FROM `%s`" % self.name))
def startElement(self, name, attrs, connection):
return None
def endElement(self, name, value, connection):
if name == 'DomainName':
self.name = value
else:
setattr(self, name, value)
def get_metadata(self):
if not self._metadata:
self._metadata = self.connection.domain_metadata(self)
return self._metadata
def put_attributes(self, item_name, attributes,
replace=True, expected_value=None):
"""
Store attributes for a given item.
:type item_name: string
:param item_name: The name of the item whose attributes are being stored.
:type attribute_names: dict or dict-like object
:param attribute_names: The name/value pairs to store as attributes
: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.
:type replace: bool
:param replace: Whether the attribute values passed in will replace
existing values or will be added as addition values.
Defaults to True.
:rtype: bool
:return: True if successful
"""
return self.connection.put_attributes(self, item_name, attributes,
replace, expected_value)
def batch_put_attributes(self, items, replace=True):
"""
Store attributes for multiple items.
: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 themselves dictionaries
of attribute names/values, exactly the same as the
attribute_names parameter of the scalar put_attributes
call.
:type replace: bool
:param replace: Whether the attribute values passed in will replace
existing values or will be added as addition values.
Defaults to True.
:rtype: bool
:return: True if successful
"""
return self.connection.batch_put_attributes(self, items, replace)
def get_attributes(self, item_name, attribute_name=None,
consistent_read=False, item=None):
"""
Retrieve attributes for a given item.
:type item_name: string
:param item_name: The name of the item whose attributes are being retrieved.
:type attribute_names: string or list of strings
:param attribute_names: An attribute name or list of attribute names. This
parameter is optional. If not supplied, all attributes
will be retrieved for the item.
:rtype: :class:`boto.sdb.item.Item`
:return: An Item mapping type containing the requested attribute name/values
"""
return self.connection.get_attributes(self, item_name, attribute_name,
consistent_read, item)
def delete_attributes(self, item_name, attributes=None,
expected_values=None):
"""
Delete attributes from a given item.
: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
"""
return self.connection.delete_attributes(self, item_name, attributes,
expected_values)
def batch_delete_attributes(self, items):
"""
Delete multiple items in this domain.
: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.
:rtype: bool
:return: True if successful
"""
return self.connection.batch_delete_attributes(self, items)
def select(self, query='', next_token=None, consistent_read=False, max_items=None):
"""
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.
:type query: string
:param query: The SimpleDB query to be performed.
:rtype: iter
:return: An iterator containing the results. This is actually a generator
function that will iterate across all search results, not just the
first page.
"""
return SelectResultSet(self, query, max_items=max_items, next_token=next_token,
consistent_read=consistent_read)
def get_item(self, item_name, consistent_read=False):
"""
Retrieves an item from the domain, along with all of its attributes.
:param string item_name: The name of the item to retrieve.
:rtype: :class:`boto.sdb.item.Item` or ``None``
:keyword bool consistent_read: When set to true, ensures that the most
recent data is returned.
:return: The requested item, or ``None`` if there was no match found
"""
item = self.get_attributes(item_name, consistent_read=consistent_read)
if item:
item.domain = self
return item
else:
return None
def new_item(self, item_name):
return self.connection.item_cls(self, item_name)
def delete_item(self, item):
self.delete_attributes(item.name)
def to_xml(self, f=None):
"""Get this domain as an XML DOM Document
:param f: Optional File to dump directly to
:type f: File or Stream
:return: File object where the XML has been dumped to
:rtype: file
"""
if not f:
from tempfile import TemporaryFile
f = TemporaryFile()
print >> f, '<?xml version="1.0" encoding="UTF-8"?>'
print >> f, '<Domain id="%s">' % self.name
for item in self:
print >> f, '\t<Item id="%s">' % item.name
for k in item:
print >> f, '\t\t<attribute id="%s">' % k
values = item[k]
if not isinstance(values, list):
values = [values]
for value in values:
print >> f, '\t\t\t<value><![CDATA[',
if isinstance(value, unicode):
value = value.encode('utf-8', 'replace')
else:
value = unicode(value, errors='replace').encode('utf-8', 'replace')
f.write(value)
print >> f, ']]></value>'
print >> f, '\t\t</attribute>'
print >> f, '\t</Item>'
print >> f, '</Domain>'
f.flush()
f.seek(0)
return f
def from_xml(self, doc):
"""Load this domain based on an XML document"""
import xml.sax
handler = DomainDumpParser(self)
xml.sax.parse(doc, handler)
return handler
def delete(self):
"""
Delete this domain, and all items under it
"""
return self.connection.delete_domain(self)
class DomainMetaData:
def __init__(self, domain=None):
self.domain = domain
self.item_count = None
self.item_names_size = None
self.attr_name_count = None
self.attr_names_size = None
self.attr_value_count = None
self.attr_values_size = None
def startElement(self, name, attrs, connection):
return None
def endElement(self, name, value, connection):
if name == 'ItemCount':
self.item_count = int(value)
elif name == 'ItemNamesSizeBytes':
self.item_names_size = int(value)
elif name == 'AttributeNameCount':
self.attr_name_count = int(value)
elif name == 'AttributeNamesSizeBytes':
self.attr_names_size = int(value)
elif name == 'AttributeValueCount':
self.attr_value_count = int(value)
elif name == 'AttributeValuesSizeBytes':
self.attr_values_size = int(value)
elif name == 'Timestamp':
self.timestamp = value
else:
setattr(self, name, value)
import sys
from xml.sax.handler import ContentHandler
class DomainDumpParser(ContentHandler):
"""
SAX parser for a domain that has been dumped
"""
def __init__(self, domain):
self.uploader = UploaderThread(domain)
self.item_id = None
self.attrs = {}
self.attribute = None
self.value = ""
self.domain = domain
def startElement(self, name, attrs):
if name == "Item":
self.item_id = attrs['id']
self.attrs = {}
elif name == "attribute":
self.attribute = attrs['id']
elif name == "value":
self.value = ""
def characters(self, ch):
self.value += ch
def endElement(self, name):
if name == "value":
if self.value and self.attribute:
value = self.value.strip()
attr_name = self.attribute.strip()
if attr_name in self.attrs:
self.attrs[attr_name].append(value)
else:
self.attrs[attr_name] = [value]
elif name == "Item":
self.uploader.items[self.item_id] = self.attrs
# Every 20 items we spawn off the uploader
if len(self.uploader.items) >= 20:
self.uploader.start()
self.uploader = UploaderThread(self.domain)
elif name == "Domain":
# If we're done, spawn off our last Uploader Thread
self.uploader.start()
from threading import Thread
class UploaderThread(Thread):
"""Uploader Thread"""
def __init__(self, domain):
self.db = domain
self.items = {}
Thread.__init__(self)
def run(self):
try:
self.db.batch_put_attributes(self.items)
except:
print "Exception using batch put, trying regular put instead"
for item_name in self.items:
self.db.put_attributes(item_name, self.items[item_name])
print ".",
sys.stdout.flush()
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