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

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