contrib/unbound/libunbound/python/doc/examples/example2.rst

   1 .. _example_setup_ctx:
   2
   3 Lookup from threads
   4 ===================
   5
   6 This example shows how to use unbound module from a threaded program.
   7 In this example, three lookup threads are created which work in background.
   8 Each thread resolves different DNS record.
   9
  10 Source code
  11 -----------
  12
  13 ::
  14
  15     #!/usr/bin/python
  16     from unbound import ub_ctx, RR_TYPE_A, RR_CLASS_IN
  17     from threading import Thread
  18
  19     ctx = ub_ctx()
  20     ctx.resolvconf("/etc/resolv.conf")
  21
  22     class LookupThread(Thread):
  23         def __init__(self,ctx, name):
  24             Thread.__init__(self)
  25             self.ctx = ctx
  26             self.name = name
  27
  28         def run(self):
  29             print "Thread lookup started:",self.name
  30             status, result = self.ctx.resolve(self.name, RR_TYPE_A, RR_CLASS_IN)
  31             if status == 0 and result.havedata:
  32                 print "  Result:",self.name,":", result.data.address_list
  33
  34     threads = []
  35     for name in ["www.fit.vutbr.cz","www.vutbr.cz","www.google.com"]:
  36         thread = LookupThread(ctx, name)
  37         thread.start()
  38         threads.append(thread)
  39
  40     for thread in threads:
  41         thread.join()