xref: /netbsd-src/external/bsd/unbound/dist/libunbound/python/doc/examples/example3.rst (revision 0cd9f4ecf44538bbdd5619b5b2081449960ab3e6)
13b6c3722Schristos.. _example_asynch:
23b6c3722Schristos
33b6c3722SchristosAsynchronous lookup
4*0cd9f4ecSchristos===================
53b6c3722Schristos
63b6c3722SchristosThis example performs the name lookup in the background.
73b6c3722SchristosThe main program keeps running while the name is resolved.
83b6c3722Schristos
9*0cd9f4ecSchristosSource code
10*0cd9f4ecSchristos-----------
11*0cd9f4ecSchristos
123b6c3722Schristos::
133b6c3722Schristos
143b6c3722Schristos	#!/usr/bin/python
153b6c3722Schristos	import time
163b6c3722Schristos	import unbound
173b6c3722Schristos
183b6c3722Schristos	ctx = unbound.ub_ctx()
193b6c3722Schristos	ctx.resolvconf("/etc/resolv.conf")
203b6c3722Schristos
213b6c3722Schristos	def call_back(my_data,status,result):
223b6c3722Schristos		print "Call_back:", my_data
233b6c3722Schristos		if status == 0 and result.havedata:
243b6c3722Schristos			print "Result:", result.data.address_list
253b6c3722Schristos			my_data['done_flag'] = True
263b6c3722Schristos
273b6c3722Schristos
283b6c3722Schristos	my_data = {'done_flag':False,'arbitrary':"object"}
293b6c3722Schristos	status, async_id = ctx.resolve_async("www.seznam.cz", my_data, call_back, unbound.RR_TYPE_A, unbound.RR_CLASS_IN)
303b6c3722Schristos
313b6c3722Schristos	while (status == 0) and (not my_data['done_flag']):
323b6c3722Schristos		status = ctx.process()
333b6c3722Schristos		time.sleep(0.1)
343b6c3722Schristos
353b6c3722Schristos	if (status != 0):
363b6c3722Schristos		print "Resolve error:", unbound.ub_strerror(status)
373b6c3722Schristos
38*0cd9f4ecSchristosThe :meth:`unbound.ub_ctx.resolve_async` method is able to pass on any Python
39*0cd9f4ecSchristosobject. In this example, we used a dictionary object ``my_data``.
40