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.. _example_asynch:
==============================
Asynchronous lookup
==============================
This example performs the name lookup in the background.
The main program keeps running while the name is resolved.
::
#!/usr/bin/python
import time
import unbound
ctx = unbound.ub_ctx()
ctx.resolvconf("/etc/resolv.conf")
def call_back(my_data,status,result):
print "Call_back:", my_data
if status == 0 and result.havedata:
print "Result:", result.data.address_list
my_data['done_flag'] = True
my_data = {'done_flag':False,'arbitrary':"object"}
status, async_id = ctx.resolve_async("www.seznam.cz", my_data, call_back, unbound.RR_TYPE_A, unbound.RR_CLASS_IN)
while (status == 0) and (not my_data['done_flag']):
status = ctx.process()
time.sleep(0.1)
if (status != 0):
print "Resolve error:", unbound.ub_strerror(status)
The :meth:`unbound.ub_ctx.resolve_async` method is able to pass on any Python object. In this example, we used a dictionary object `my_data`.
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