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How to use read_maybe method in yandex-tank

Best Python code snippet using yandex-tank

console.py

Source:console.py

...40                self.handle.read_watch()41        finally:42            signal.alarm(0)43            if watch is not None: self.handle.unwatch(path, watch)44    def read_maybe(self, path):45        return self.handle.read('0', path)46def runVncViewer(domid, do_autopass, do_daemonize=False):47    xs = OurXenstoreConnection()48    d = '/local/domain/%d/' % domid49    vnc_port = xs.read_eventually(d + 'console/vnc-port')50    vfb_backend = xs.read_maybe(d + 'device/vfb/0/backend')51    vnc_listen = None52    vnc_password = None53    vnc_password_tmpfile = None54    cmdl = ['vncviewer']55    if vfb_backend is not None:56        vnc_listen = xs.read_maybe(vfb_backend + '/vnclisten')57        if do_autopass:58            vnc_password = xs.read_maybe(vfb_backend + '/vncpasswd')59            if vnc_password is not None:60                cmdl.append('-autopass')61                vnc_password_tmpfile = os.tmpfile()62                print >>vnc_password_tmpfile, vnc_password63                vnc_password_tmpfile.seek(0)64                vnc_password_tmpfile.flush()65    if vnc_listen is None:66        vnc_listen = 'localhost'67    cmdl.append('%s:%d' % (vnc_listen, int(vnc_port) - 5900))68    if do_daemonize:69        pid = utils.daemonize('vncviewer', cmdl, vnc_password_tmpfile)70        if pid == 0:71            puts >>sys.stderr, 'failed to invoke vncviewer'72            os._exit(-1)...

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