text: # Copyright (c) 2008 AG Projects
  # Author: Denis Bilenko
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  # THE SOFTWARE.
  
  from __future__ import with_statement
  import sys
  import greentest
  import weakref
  import time
  from gevent import sleep, Timeout
  DELAY = 0.04
  
  
  class Error(Exception):
      pass
  
  
  class Test(greentest.TestCase):
  
      def test_api(self):
          # Nothing happens if with-block finishes before the timeout expires
          t = Timeout(DELAY * 2)
          assert not t.pending, repr(t)
          with t:
              assert t.pending, repr(t)
              sleep(DELAY)
          # check if timer was actually cancelled
          assert not t.pending, repr(t)
          sleep(DELAY * 2)
  
          # An exception will be raised if it's not
          try:
              with Timeout(DELAY) as t:
                  sleep(DELAY * 2)
          except Timeout, ex:
              assert ex is t, (ex, t)
          else:
              raise AssertionError('must raise Timeout')
  
          # You can customize the exception raised:
          try:
              with Timeout(DELAY, IOError("Operation takes way too long")):
                  sleep(DELAY * 2)
          except IOError, ex:
              assert str(ex) == "Operation takes way too long", repr(ex)
  
          # Providing classes instead of values should be possible too:
          try:
              with Timeout(DELAY, ValueError):
                  sleep(DELAY * 2)
          except ValueError:
              pass
  
          try:
              1 / 0
          except:
              try:
                  with Timeout(DELAY, sys.exc_info()[0]):
                      sleep(DELAY * 2)
                      raise AssertionError('should not get there')
                  raise AssertionError('should not get there')
              except ZeroDivisionError:
                  pass
          else:
              raise AssertionError('should not get there')
  
          # It's possible to cancel the timer inside the block:
          with Timeout(DELAY) as timer:
              timer.cancel()
              sleep(DELAY * 2)
  
          # To silent the exception before exiting the block, pass False as second parameter.
          XDELAY = 0.1
          start = time.time()
          with Timeout(XDELAY, False):
              sleep(XDELAY * 2)
          delta = (time.time() - start)
          assert delta < XDELAY * 2, delta
  
          # passing None as seconds disables the timer
          with Timeout(None):
              sleep(DELAY)
          sleep(DELAY)
  
      def test_ref(self):
          err = Error()
          err_ref = weakref.ref(err)
          with Timeout(DELAY * 2, err):
              sleep(DELAY)
          del err
          assert not err_ref(), repr(err_ref())
  
      def test_nested_timeout(self):
          with Timeout(DELAY, False):
              with Timeout(DELAY * 2, False):
                  sleep(DELAY * 3)
              raise AssertionError('should not get there')
  
          with Timeout(DELAY) as t1:
              with Timeout(DELAY * 2) as t2:
                  try:
                      sleep(DELAY * 3)
                  except Timeout, ex:
                      assert ex is t1, (ex, t1)
                  assert not t1.pending, t1
                  assert t2.pending, t2
              assert not t2.pending, t2
  
          with Timeout(DELAY * 2) as t1:
              with Timeout(DELAY) as t2:
                  try:
                      sleep(DELAY * 3)
                  except Timeout, ex:
                      assert ex is t2, (ex, t2)
                  assert t1.pending, t1
                  assert not t2.pending, t2
          assert not t1.pending, t1
  
  
  if __name__ == '__main__':
      greentest.main()
  