.. _example_setup_ctx:

Lookup from threads
===================

This example shows how to use unbound module from a threaded program.
In this example, three lookup threads are created which work in background.
Each thread resolves different DNS record.

Source code
-----------

::

    #!/usr/bin/python
    from unbound import ub_ctx, RR_TYPE_A, RR_CLASS_IN
    from threading import Thread

    ctx = ub_ctx()
    ctx.resolvconf("/etc/resolv.conf")

    class LookupThread(Thread):
        def __init__(self,ctx, name):
            Thread.__init__(self)
            self.ctx = ctx
            self.name = name

        def run(self):
            print "Thread lookup started:",self.name
            status, result = self.ctx.resolve(self.name, RR_TYPE_A, RR_CLASS_IN)
            if status == 0 and result.havedata:
                print "  Result:",self.name,":", result.data.address_list

    threads = []
    for name in ["www.fit.vutbr.cz","www.vutbr.cz","www.google.com"]:
        thread = LookupThread(ctx, name)
        thread.start()
        threads.append(thread)

    for thread in threads:
        thread.join()