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"""
SleekXMPP: The Sleek XMPP Library
Copyright (C) 2010 Nathanael C. Fritz, Erik Reuterborg Larsson
This file is part of SleekXMPP.
See the file LICENSE for copying permission.
"""
import logging
import sleekxmpp
from sleekxmpp import Iq
from sleekxmpp.plugins.base import base_plugin
from sleekxmpp.xmlstream import register_stanza_plugin
from sleekxmpp.plugins.xep_0059 import Set
log = logging.getLogger(__name__)
class ResultIterator():
"""
An iterator for Result Set Managment
"""
def __init__(self, query, interface, amount=10, start=None, reverse=False):
"""
Arguments:
query -- The template query
interface -- The substanza of the query, for example disco_items
amount -- The max amounts of items to request per iteration
start -- From which item id to start
reverse -- If True, page backwards through the results
Example:
q = Iq()
q['to'] = 'pubsub.example.com'
q['disco_items']['node'] = 'blog'
for i in ResultIterator(q, 'disco_items', '10'):
print i['disco_items']['items']
"""
self.query = query
self.amount = amount
self.start = start
self.interface = interface
self.reverse = reverse
def __iter__(self):
return self
def __next__(self):
return self.next()
def next(self):
"""
Return the next page of results from a query.
Note: If using backwards paging, then the next page of
results will be the items before the current page
of items.
"""
self.query[self.interface]['rsm']['before'] = self.reverse
self.query['id'] = self.query.stream.new_id()
self.query[self.interface]['rsm']['max'] = str(self.amount)
if self.start and self.reverse:
self.query[self.interface]['rsm']['before'] = self.start
elif self.start:
self.query[self.interface]['rsm']['after'] = self.start
r = self.query.send(block=True)
if not r or not r[self.interface]['rsm']['first'] and \
not r[self.interface]['rsm']['last']:
raise StopIteration
if self.reverse:
self.start = r[self.interface]['rsm']['first']
else:
self.start = r[self.interface]['rsm']['last']
return r
class xep_0059(base_plugin):
"""
XEP-0050: Result Set Management
"""
def plugin_init(self):
"""
Start the XEP-0059 plugin.
"""
self.xep = '0059'
self.description = 'Result Set Management'
self.stanza = sleekxmpp.plugins.xep_0059.stanza
def post_init(self):
"""Handle inter-plugin dependencies."""
base_plugin.post_init(self)
self.xmpp['xep_0030'].add_feature(Set.namespace)
def iterate(self, stanza, interface):
"""
Create a new result set iterator for a given stanza query.
Arguments:
stanza -- A stanza object to serve as a template for
queries made each iteration. For example, a
basic disco#items query.
interface -- The name of the substanza to which the
result set management stanza should be
appended. For example, for disco#items queries
the interface 'disco_items' should be used.
"""
return ResultIterator(stanza, interface)
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