101 lines
3.6 KiB
Python
101 lines
3.6 KiB
Python
# Copyright The PyTorch Lightning team.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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import sys
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import threading
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from functools import partial, wraps
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from http.server import SimpleHTTPRequestHandler
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import pytest
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import torch.distributed
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import torch.multiprocessing as mp
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@pytest.fixture(scope="function", autouse=True)
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def preserve_global_rank_variable():
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""" Ensures that the rank_zero_only.rank global variable gets reset in each test. """
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from pytorch_lightning.utilities.distributed import rank_zero_only
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rank = getattr(rank_zero_only, "rank", None)
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yield
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if rank is not None:
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setattr(rank_zero_only, "rank", rank)
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@pytest.fixture(scope="function", autouse=True)
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def restore_env_variables():
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""" Ensures that environment variables set during the test do not leak out. """
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env_backup = os.environ.copy()
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yield
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# restore environment as it was before running the test
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os.environ.clear()
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os.environ.update(env_backup)
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@pytest.fixture(scope="function", autouse=True)
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def teardown_process_group():
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""" Ensures that the distributed process group gets closed before the next test runs. """
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yield
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if torch.distributed.is_available() and torch.distributed.is_initialized():
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torch.distributed.destroy_process_group()
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def pytest_configure(config):
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config.addinivalue_line("markers", "spawn: spawn test in a separate process using torch.multiprocessing.spawn")
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@pytest.mark.tryfirst
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def pytest_pyfunc_call(pyfuncitem):
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if pyfuncitem.get_closest_marker("spawn"):
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testfunction = pyfuncitem.obj
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funcargs = pyfuncitem.funcargs
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testargs = tuple([funcargs[arg] for arg in pyfuncitem._fixtureinfo.argnames])
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mp.spawn(wraps, (testfunction, testargs))
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return True
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@pytest.fixture
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def tmpdir_server(tmpdir):
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if sys.version_info >= (3, 7):
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Handler = partial(SimpleHTTPRequestHandler, directory=str(tmpdir))
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from http.server import ThreadingHTTPServer
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else:
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# unfortunately SimpleHTTPRequestHandler doesn't accept the directory arg in python3.6
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# so we have to hack it like this
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class Handler(SimpleHTTPRequestHandler):
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def translate_path(self, path):
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# get the path from cwd
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path = super().translate_path(path)
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# get the relative path
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relpath = os.path.relpath(path, os.getcwd())
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# return the full path from root_dir
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return os.path.join(str(tmpdir), relpath)
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# ThreadingHTTPServer was added in 3.7, so we need to define it ourselves
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from http.server import HTTPServer
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from socketserver import ThreadingMixIn
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class ThreadingHTTPServer(ThreadingMixIn, HTTPServer):
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daemon_threads = True
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with ThreadingHTTPServer(('localhost', 0), Handler) as server:
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server_thread = threading.Thread(target=server.serve_forever)
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# Exit the server thread when the main thread terminates
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server_thread.daemon = True
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server_thread.start()
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yield server.server_address
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server.shutdown()
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