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testutil.py 1.9KB

1 year ago
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  1. ###############################################################################
  2. #
  3. # The MIT License (MIT)
  4. #
  5. # Copyright (c) typedef int GmbH
  6. #
  7. # Permission is hereby granted, free of charge, to any person obtaining a copy
  8. # of this software and associated documentation files (the "Software"), to deal
  9. # in the Software without restriction, including without limitation the rights
  10. # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11. # copies of the Software, and to permit persons to whom the Software is
  12. # furnished to do so, subject to the following conditions:
  13. #
  14. # The above copyright notice and this permission notice shall be included in
  15. # all copies or substantial portions of the Software.
  16. #
  17. # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18. # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19. # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  20. # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21. # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22. # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23. # THE SOFTWARE.
  24. #
  25. ###############################################################################
  26. import txaio
  27. from contextlib import contextmanager
  28. @contextmanager
  29. def replace_loop(new_loop):
  30. """
  31. This is a context-manager that sets the txaio event-loop to the
  32. one supplied temporarily. It's up to you to ensure you pass an
  33. event_loop or a reactor instance depending upon asyncio/Twisted.
  34. Use like so:
  35. .. sourcecode:: python
  36. from twisted.internet import task
  37. with replace_loop(task.Clock()) as fake_reactor:
  38. f = txaio.call_later(5, foo)
  39. fake_reactor.advance(10)
  40. # ...etc
  41. """
  42. # setup
  43. orig = txaio.config.loop
  44. txaio.config.loop = new_loop
  45. yield new_loop
  46. # cleanup
  47. txaio.config.loop = orig