async-lookup.py revision 285206 
1#!/usr/bin/python
2'''
3 async-lookup.py : This example shows how to use asynchronous lookups
4
5 Authors: Zdenek Vasicek (vasicek AT fit.vutbr.cz)
6          Marek Vavrusa  (xvavru00 AT stud.fit.vutbr.cz)
7
8 Copyright (c) 2008. All rights reserved.
9
10 This software is open source.
11
12 Redistribution and use in source and binary forms, with or without
13 modification, are permitted provided that the following conditions
14 are met:
15
16 Redistributions of source code must retain the above copyright notice,
17 this list of conditions and the following disclaimer.
18
19 Redistributions in binary form must reproduce the above copyright notice,
20 this list of conditions and the following disclaimer in the documentation
21 and/or other materials provided with the distribution.
22
23 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
25 TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
26 PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
27 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 POSSIBILITY OF SUCH DAMAGE.
34'''
35import unbound
36import time
37
38ctx = unbound.ub_ctx()
39ctx.resolvconf("/etc/resolv.conf")
40
41def call_back(my_data,status,result):
42    print("Call_back:", my_data)
43    if status == 0 and result.havedata:
44        print("Result:", result.data.address_list)
45        my_data['done_flag'] = True
46
47
48my_data = {'done_flag':False,'arbitrary':"object"}
49status, async_id = ctx.resolve_async("www.nic.cz", my_data, call_back, unbound.RR_TYPE_A, unbound.RR_CLASS_IN)
50
51while (status == 0) and (not my_data['done_flag']):
52    status = ctx.process()
53    time.sleep(0.1)
54
55if (status != 0):
56    print("Resolve error:", unbound.ub_strerror(status))
57