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Resolve asyncio + multiprocessing problem when testing. (#247)
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parent
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.gitignore
vendored
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.gitignore
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@ -1,3 +1,4 @@
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.idea/
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*.egg-info
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*.pyc
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__pycache__
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37
.travis.yml
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.travis.yml
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@ -34,6 +34,43 @@ jobs:
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dist: xenial
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sudo: required
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- os: osx
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language: generic
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python: '3.5'
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env: TWISTED="twisted==18.7.0"
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before_install:
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- eval "$(pyenv init -)"
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- pyenv install 3.5.5
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- pyenv global 3.5.5
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sudo: required
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- os: osx
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language: generic
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python: '3.5'
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env: TWISTED="twisted"
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before_install:
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- eval "$(pyenv init -)"
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- pyenv install 3.5.5
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- pyenv global 3.5.5
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sudo: required
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- os: osx
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language: generic
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python: '3.6'
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env: TWISTED="twisted==18.7.0"
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before_install:
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- eval "$(pyenv init -)"
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- pyenv install 3.6.5
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- pyenv global 3.6.5
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sudo: required
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- os: osx
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language: generic
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python: '3.6'
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env: TWISTED="twisted"
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before_install:
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- eval "$(pyenv init -)"
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- pyenv install 3.6.5
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- pyenv global 3.6.5
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sudo: required
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- stage: lint
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install: pip install -U -e .[tests] black pyflakes isort
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script:
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@ -6,11 +6,6 @@ import tempfile
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import traceback
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from concurrent.futures import CancelledError
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from twisted.internet import reactor
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from .endpoints import build_endpoint_description_strings
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from .server import Server
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class DaphneTestingInstance:
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"""
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@ -121,6 +116,17 @@ class DaphneProcess(multiprocessing.Process):
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self.errors = multiprocessing.Queue()
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def run(self):
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# OK, now we are in a forked child process, and want to use the reactor.
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# However, FreeBSD systems like MacOS do not fork the underlying Kqueue,
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# which asyncio (hence asyncioreactor) is built on.
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# Therefore, we should uninstall the broken reactor and install a new one.
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_reinstall_reactor()
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from twisted.internet import reactor
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from .server import Server
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from .endpoints import build_endpoint_description_strings
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try:
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# Create the server class
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endpoints = build_endpoint_description_strings(host=self.host, port=0)
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@ -143,6 +149,8 @@ class DaphneProcess(multiprocessing.Process):
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self.errors.put((e, traceback.format_exc()))
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def resolve_port(self):
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from twisted.internet import reactor
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if self.server.listening_addresses:
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self.port.value = self.server.listening_addresses[0][1]
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self.ready.set()
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@ -249,3 +257,24 @@ class TestApplication:
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os.unlink(cls.result_storage)
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except OSError:
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pass
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def _reinstall_reactor():
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import sys
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import asyncio
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from twisted.internet import asyncioreactor
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# Uninstall the reactor.
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if "twisted.internet.reactor" in sys.modules:
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del sys.modules["twisted.internet.reactor"]
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# The daphne.server module may have already installed the reactor.
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# If so, using this module will use uninstalled one, thus we should
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# reimport this module too.
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if "daphne.server" in sys.modules:
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del sys.modules["daphne.server"]
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event_loop = asyncio.new_event_loop()
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asyncioreactor.install(event_loop)
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asyncio.set_event_loop(event_loop)
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