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view tests/test-wireproto-clientreactor.py @ 51977:42a116f1cdc1

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branchmap-v3: introduce a "stop_rev" argument to `headsrevs` The `headsrevs` method of the revlog already have a `revs` argument to compute the headrevs of a limited set of heads. However, it disable the use of the native compiled code to compute the heads, which slows down the branchmap v3 code a lot. The branchmap v3 usage is actually quite constrained as we will always only ignores a part at the top of the graph. So we could be significantly faster. We start by making small change to the python side to improve the situation and introduce the new API. More collaboration with the native code are coming later. This massively speedup operation and close most of the remaining gaps between branchmap-v3 and branchmap-v2. especially on repository with many revs like mozilla-try. A small overhead remains mostly because the `headrevs` logic currently has some inefficiently. We will look into them from there. ### benchmark.name = hg.command.unbundle # bin-env-vars.hg.py-re2-module = default # benchmark.variants.issue6528 = disabled # benchmark.variants.resource-usage = default # benchmark.variants.reuse-external-delta-parent = yes # benchmark.variants.revs = any-1-extra-rev # benchmark.variants.source = unbundle # benchmark.variants.validate = default # benchmark.variants.verbosity = quiet ## data-env-vars.name = netbeans-2018-08-01-zstd-sparse-revlog # bin-env-vars.hg.flavor = default branch-v2: 0.233711 ~~~~~ branch-v3 before: 0.368769 (+57.79%, +0.14) branch-v3 after: 0.239857 (+2.63%, +0.01) # bin-env-vars.hg.flavor = rust branch-v2: 0.235230 ~~~~~ branch-v3 before: 0.372460 (+58.34%, +0.14) branch-v3 after: 0.240972 (+2.44%, +0.01) ## data-env-vars.name = netbeans-2018-08-01-ds2-pnm # bin-env-vars.hg.flavor = rust branch-v2: 0.255586 ~~~~~ branch-v3 before: 0.318907 (+24.78%, +0.06) branch-v3 after: 0.268560 (+5.08%, +0.01) ## data-env-vars.name = mozilla-central-2024-03-22-zstd-sparse-revlog # bin-env-vars.hg.flavor = default branch-v2: 0.339010 ~~~~~ branch-v3 before: 0.349752 (+3.17%, +0.01) branch-v3 after: 0.349389 (+3.06%, +0.01) # bin-env-vars.hg.flavor = rust branch-v2: 0.346525 ~~~~~ branch-v3 before: 0.354300 (+2.24%, +0.01) branch-v3 after: 0.355661 (+2.64%, +0.01) ## data-env-vars.name = mozilla-central-2024-03-22-ds2-pnm # bin-env-vars.hg.flavor = rust branch-v2: 0.380202 ~~~~~ branch-v3 before: 0.396293 (+4.23%, +0.02) branch-v3 after: 0.408851 (+7.54%, +0.03) ## data-env-vars.name = mozilla-unified-2024-03-22-zstd-sparse-revlog # bin-env-vars.hg.flavor = default branch-v2: 0.412165 ~~~~~ branch-v3 before: 0.424769 (+3.06%, +0.01) branch-v3 after: 0.427782 (+3.79%, +0.02) # bin-env-vars.hg.flavor = rust branch-v2: 0.412397 ~~~~~ branch-v3 before: 0.421796 (+2.28%, +0.01) branch-v3 after: 0.422354 (+2.41%, +0.01) ## data-env-vars.name = mozilla-unified-2024-03-22-ds2-pnm # bin-env-vars.hg.flavor = rust branch-v2: 0.429501 ~~~~~ branch-v3 before: 0.443849 (+3.34%, +0.01) branch-v3 after: 0.443197 (+3.19%, +0.01) ## data-env-vars.name = mozilla-try-2024-03-26-zstd-sparse-revlog # bin-env-vars.hg.flavor = default branch-v2: 3.403171 ~~~~~ branch-v3 before: 6.234055 (+83.18%, +2.83) branch-v3 after: 3.819477 (+12.23%, +0.42) # bin-env-vars.hg.flavor = rust branch-v2: 3.454876 ~~~~~ branch-v3 before: 6.307813 (+82.58%, +2.85) branch-v3 after: 3.590284 (+3.92%, +0.14) ## data-env-vars.name = mozilla-try-2024-03-26-ds2-pnm # bin-env-vars.hg.flavor = rust branch-v2: 3.465435 ~~~~~ branch-v3 before: 5.176076 (+49.36%, +1.71) branch-v3 after: 3.633278 (+4.84%, +0.17)
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Tue, 03 Sep 2024 11:11:17 +0200
parents 6000f5b25c9b
children
line wrap: on
line source

import sys
import unittest
import zlib

from mercurial import (
    error,
    ui as uimod,
    wireprotoframing as framing,
)
from mercurial.utils import cborutil

try:
    from mercurial import zstd

    zstd.__version__
except ImportError:
    zstd = None

ffs = framing.makeframefromhumanstring

globalui = uimod.ui()


def sendframe(reactor, frame):
    """Send a frame bytearray to a reactor."""
    header = framing.parseheader(frame)
    payload = frame[framing.FRAME_HEADER_SIZE :]
    assert len(payload) == header.length

    return reactor.onframerecv(
        framing.frame(
            header.requestid,
            header.streamid,
            header.streamflags,
            header.typeid,
            header.flags,
            payload,
        )
    )


class SingleSendTests(unittest.TestCase):
    """A reactor that can only send once rejects subsequent sends."""

    if not getattr(unittest.TestCase, 'assertRaisesRegex', False):
        # Python 3.7 deprecates the regex*p* version, but 2.7 lacks
        # the regex version.
        assertRaisesRegex = (  # camelcase-required
            unittest.TestCase.assertRaisesRegexp
        )

    def testbasic(self):
        reactor = framing.clientreactor(
            globalui, hasmultiplesend=False, buffersends=True
        )

        request, action, meta = reactor.callcommand(b'foo', {})
        self.assertEqual(request.state, b'pending')
        self.assertEqual(action, b'noop')

        action, meta = reactor.flushcommands()
        self.assertEqual(action, b'sendframes')

        for frame in meta[b'framegen']:
            self.assertEqual(request.state, b'sending')

        self.assertEqual(request.state, b'sent')

        with self.assertRaisesRegex(
            error.ProgrammingError, 'cannot issue new commands'
        ):
            reactor.callcommand(b'foo', {})

        with self.assertRaisesRegex(
            error.ProgrammingError, 'cannot issue new commands'
        ):
            reactor.callcommand(b'foo', {})


class NoBufferTests(unittest.TestCase):
    """A reactor without send buffering sends requests immediately."""

    def testbasic(self):
        reactor = framing.clientreactor(
            globalui, hasmultiplesend=True, buffersends=False
        )

        request, action, meta = reactor.callcommand(b'command1', {})
        self.assertEqual(request.requestid, 1)
        self.assertEqual(action, b'sendframes')

        self.assertEqual(request.state, b'pending')

        for frame in meta[b'framegen']:
            self.assertEqual(request.state, b'sending')

        self.assertEqual(request.state, b'sent')

        action, meta = reactor.flushcommands()
        self.assertEqual(action, b'noop')

        # And we can send another command.
        request, action, meta = reactor.callcommand(b'command2', {})
        self.assertEqual(request.requestid, 3)
        self.assertEqual(action, b'sendframes')

        for frame in meta[b'framegen']:
            self.assertEqual(request.state, b'sending')

        self.assertEqual(request.state, b'sent')


class BadFrameRecvTests(unittest.TestCase):
    if not getattr(unittest.TestCase, 'assertRaisesRegex', False):
        # Python 3.7 deprecates the regex*p* version, but 2.7 lacks
        # the regex version.
        assertRaisesRegex = (  # camelcase-required
            unittest.TestCase.assertRaisesRegexp
        )

    def testoddstream(self):
        reactor = framing.clientreactor(globalui)

        action, meta = sendframe(reactor, ffs(b'1 1 0 1 0 foo'))
        self.assertEqual(action, b'error')
        self.assertEqual(
            meta[b'message'], b'received frame with odd numbered stream ID: 1'
        )

    def testunknownstream(self):
        reactor = framing.clientreactor(globalui)

        action, meta = sendframe(reactor, ffs(b'1 0 0 1 0 foo'))
        self.assertEqual(action, b'error')
        self.assertEqual(
            meta[b'message'],
            b'received frame on unknown stream without beginning '
            b'of stream flag set',
        )

    def testunhandledframetype(self):
        reactor = framing.clientreactor(globalui, buffersends=False)

        request, action, meta = reactor.callcommand(b'foo', {})
        for frame in meta[b'framegen']:
            pass

        with self.assertRaisesRegex(
            error.ProgrammingError, 'unhandled frame type'
        ):
            sendframe(reactor, ffs(b'1 0 stream-begin text-output 0 foo'))


class StreamTests(unittest.TestCase):
    def testmultipleresponseframes(self):
        reactor = framing.clientreactor(globalui, buffersends=False)

        request, action, meta = reactor.callcommand(b'foo', {})

        self.assertEqual(action, b'sendframes')
        for f in meta[b'framegen']:
            pass

        action, meta = sendframe(
            reactor,
            ffs(
                b'%d 0 stream-begin command-response 0 foo' % request.requestid
            ),
        )
        self.assertEqual(action, b'responsedata')

        action, meta = sendframe(
            reactor, ffs(b'%d 0 0 command-response eos bar' % request.requestid)
        )
        self.assertEqual(action, b'responsedata')


class RedirectTests(unittest.TestCase):
    def testredirect(self):
        reactor = framing.clientreactor(globalui, buffersends=False)

        redirect = {
            b'targets': [b'a', b'b'],
            b'hashes': [b'sha256'],
        }

        request, action, meta = reactor.callcommand(
            b'foo', {}, redirect=redirect
        )

        self.assertEqual(action, b'sendframes')

        frames = list(meta[b'framegen'])
        self.assertEqual(len(frames), 1)

        self.assertEqual(
            frames[0],
            ffs(
                b'1 1 stream-begin command-request new '
                b"cbor:{b'name': b'foo', "
                b"b'redirect': {b'targets': [b'a', b'b'], "
                b"b'hashes': [b'sha256']}}"
            ),
        )


class StreamSettingsTests(unittest.TestCase):
    def testnoflags(self):
        reactor = framing.clientreactor(globalui, buffersends=False)

        request, action, meta = reactor.callcommand(b'foo', {})
        for f in meta[b'framegen']:
            pass

        action, meta = sendframe(
            reactor, ffs(b'1 2 stream-begin stream-settings 0 ')
        )

        self.assertEqual(action, b'error')
        self.assertEqual(
            meta,
            {
                b'message': b'stream encoding settings frame must have '
                b'continuation or end of stream flag set',
            },
        )

    def testconflictflags(self):
        reactor = framing.clientreactor(globalui, buffersends=False)

        request, action, meta = reactor.callcommand(b'foo', {})
        for f in meta[b'framegen']:
            pass

        action, meta = sendframe(
            reactor, ffs(b'1 2 stream-begin stream-settings continuation|eos ')
        )

        self.assertEqual(action, b'error')
        self.assertEqual(
            meta,
            {
                b'message': b'stream encoding settings frame cannot have both '
                b'continuation and end of stream flags set',
            },
        )

    def testemptypayload(self):
        reactor = framing.clientreactor(globalui, buffersends=False)

        request, action, meta = reactor.callcommand(b'foo', {})
        for f in meta[b'framegen']:
            pass

        action, meta = sendframe(
            reactor, ffs(b'1 2 stream-begin stream-settings eos ')
        )

        self.assertEqual(action, b'error')
        self.assertEqual(
            meta,
            {
                b'message': b'stream encoding settings frame did not contain '
                b'CBOR data'
            },
        )

    def testbadcbor(self):
        reactor = framing.clientreactor(globalui, buffersends=False)

        request, action, meta = reactor.callcommand(b'foo', {})
        for f in meta[b'framegen']:
            pass

        action, meta = sendframe(
            reactor, ffs(b'1 2 stream-begin stream-settings eos badvalue')
        )

        self.assertEqual(action, b'error')

    def testsingleobject(self):
        reactor = framing.clientreactor(globalui, buffersends=False)

        request, action, meta = reactor.callcommand(b'foo', {})
        for f in meta[b'framegen']:
            pass

        action, meta = sendframe(
            reactor,
            ffs(b'1 2 stream-begin stream-settings eos cbor:b"identity"'),
        )

        self.assertEqual(action, b'noop')
        self.assertEqual(meta, {})

    def testmultipleobjects(self):
        reactor = framing.clientreactor(globalui, buffersends=False)

        request, action, meta = reactor.callcommand(b'foo', {})
        for f in meta[b'framegen']:
            pass

        data = b''.join(
            [
                b''.join(cborutil.streamencode(b'identity')),
                b''.join(cborutil.streamencode({b'foo', b'bar'})),
            ]
        )

        action, meta = sendframe(
            reactor, ffs(b'1 2 stream-begin stream-settings eos %s' % data)
        )

        self.assertEqual(action, b'error')
        self.assertEqual(
            meta,
            {
                b'message': b'error setting stream decoder: identity decoder '
                b'received unexpected additional values',
            },
        )

    def testmultipleframes(self):
        reactor = framing.clientreactor(globalui, buffersends=False)

        request, action, meta = reactor.callcommand(b'foo', {})
        for f in meta[b'framegen']:
            pass

        data = b''.join(cborutil.streamencode(b'identity'))

        action, meta = sendframe(
            reactor,
            ffs(
                b'1 2 stream-begin stream-settings continuation %s' % data[0:3]
            ),
        )

        self.assertEqual(action, b'noop')
        self.assertEqual(meta, {})

        action, meta = sendframe(
            reactor, ffs(b'1 2 0 stream-settings eos %s' % data[3:])
        )

        self.assertEqual(action, b'noop')
        self.assertEqual(meta, {})

    def testinvalidencoder(self):
        reactor = framing.clientreactor(globalui, buffersends=False)

        request, action, meta = reactor.callcommand(b'foo', {})
        for f in meta[b'framegen']:
            pass

        action, meta = sendframe(
            reactor,
            ffs(b'1 2 stream-begin stream-settings eos cbor:b"badvalue"'),
        )

        self.assertEqual(action, b'error')
        self.assertEqual(
            meta,
            {
                b'message': b'error setting stream decoder: unknown stream '
                b'decoder: badvalue',
            },
        )

    def testzlibencoding(self):
        reactor = framing.clientreactor(globalui, buffersends=False)

        request, action, meta = reactor.callcommand(b'foo', {})
        for f in meta[b'framegen']:
            pass

        action, meta = sendframe(
            reactor,
            ffs(
                b'%d 2 stream-begin stream-settings eos cbor:b"zlib"'
                % request.requestid
            ),
        )

        self.assertEqual(action, b'noop')
        self.assertEqual(meta, {})

        result = {
            b'status': b'ok',
        }
        encoded = b''.join(cborutil.streamencode(result))

        compressed = zlib.compress(encoded)
        self.assertEqual(zlib.decompress(compressed), encoded)

        action, meta = sendframe(
            reactor,
            ffs(
                b'%d 2 encoded command-response eos %s'
                % (request.requestid, compressed)
            ),
        )

        self.assertEqual(action, b'responsedata')
        self.assertEqual(meta[b'data'], encoded)

    def testzlibencodingsinglebyteframes(self):
        reactor = framing.clientreactor(globalui, buffersends=False)

        request, action, meta = reactor.callcommand(b'foo', {})
        for f in meta[b'framegen']:
            pass

        action, meta = sendframe(
            reactor,
            ffs(
                b'%d 2 stream-begin stream-settings eos cbor:b"zlib"'
                % request.requestid
            ),
        )

        self.assertEqual(action, b'noop')
        self.assertEqual(meta, {})

        result = {
            b'status': b'ok',
        }
        encoded = b''.join(cborutil.streamencode(result))

        compressed = zlib.compress(encoded)
        self.assertEqual(zlib.decompress(compressed), encoded)

        chunks = []

        for i in range(len(compressed)):
            char = compressed[i : i + 1]
            if char == b'\\':
                char = b'\\\\'
            action, meta = sendframe(
                reactor,
                ffs(
                    b'%d 2 encoded command-response continuation %s'
                    % (request.requestid, char)
                ),
            )

            self.assertEqual(action, b'responsedata')
            chunks.append(meta[b'data'])
            self.assertTrue(meta[b'expectmore'])
            self.assertFalse(meta[b'eos'])

        # zlib will have the full data decoded at this point, even though
        # we haven't flushed.
        self.assertEqual(b''.join(chunks), encoded)

        # End the stream for good measure.
        action, meta = sendframe(
            reactor,
            ffs(b'%d 2 stream-end command-response eos ' % request.requestid),
        )

        self.assertEqual(action, b'responsedata')
        self.assertEqual(meta[b'data'], b'')
        self.assertFalse(meta[b'expectmore'])
        self.assertTrue(meta[b'eos'])

    def testzlibmultipleresponses(self):
        # We feed in zlib compressed data on the same stream but belonging to
        # 2 different requests. This tests our flushing behavior.
        reactor = framing.clientreactor(
            globalui, buffersends=False, hasmultiplesend=True
        )

        request1, action, meta = reactor.callcommand(b'foo', {})
        for f in meta[b'framegen']:
            pass

        request2, action, meta = reactor.callcommand(b'foo', {})
        for f in meta[b'framegen']:
            pass

        outstream = framing.outputstream(2)
        outstream.setencoder(globalui, b'zlib')

        response1 = b''.join(
            cborutil.streamencode(
                {
                    b'status': b'ok',
                    b'extra': b'response1' * 10,
                }
            )
        )

        response2 = b''.join(
            cborutil.streamencode(
                {
                    b'status': b'error',
                    b'extra': b'response2' * 10,
                }
            )
        )

        action, meta = sendframe(
            reactor,
            ffs(
                b'%d 2 stream-begin stream-settings eos cbor:b"zlib"'
                % request1.requestid
            ),
        )

        self.assertEqual(action, b'noop')
        self.assertEqual(meta, {})

        # Feeding partial data in won't get anything useful out.
        action, meta = sendframe(
            reactor,
            ffs(
                b'%d 2 encoded command-response continuation %s'
                % (request1.requestid, outstream.encode(response1))
            ),
        )
        self.assertEqual(action, b'responsedata')
        self.assertEqual(meta[b'data'], b'')

        # But flushing data at both ends will get our original data.
        action, meta = sendframe(
            reactor,
            ffs(
                b'%d 2 encoded command-response eos %s'
                % (request1.requestid, outstream.flush())
            ),
        )
        self.assertEqual(action, b'responsedata')
        self.assertEqual(meta[b'data'], response1)

        # We should be able to reuse the compressor/decompressor for the
        # 2nd response.
        action, meta = sendframe(
            reactor,
            ffs(
                b'%d 2 encoded command-response continuation %s'
                % (request2.requestid, outstream.encode(response2))
            ),
        )
        self.assertEqual(action, b'responsedata')
        self.assertEqual(meta[b'data'], b'')

        action, meta = sendframe(
            reactor,
            ffs(
                b'%d 2 encoded command-response eos %s'
                % (request2.requestid, outstream.flush())
            ),
        )
        self.assertEqual(action, b'responsedata')
        self.assertEqual(meta[b'data'], response2)

    @unittest.skipUnless(zstd, 'zstd not available')
    def testzstd8mbencoding(self):
        reactor = framing.clientreactor(globalui, buffersends=False)

        request, action, meta = reactor.callcommand(b'foo', {})
        for f in meta[b'framegen']:
            pass

        action, meta = sendframe(
            reactor,
            ffs(
                b'%d 2 stream-begin stream-settings eos cbor:b"zstd-8mb"'
                % request.requestid
            ),
        )

        self.assertEqual(action, b'noop')
        self.assertEqual(meta, {})

        result = {
            b'status': b'ok',
        }
        encoded = b''.join(cborutil.streamencode(result))

        encoder = framing.zstd8mbencoder(globalui)
        compressed = encoder.encode(encoded) + encoder.finish()
        self.assertEqual(
            zstd.ZstdDecompressor().decompress(
                compressed, max_output_size=len(encoded)
            ),
            encoded,
        )

        action, meta = sendframe(
            reactor,
            ffs(
                b'%d 2 encoded command-response eos %s'
                % (request.requestid, compressed)
            ),
        )

        self.assertEqual(action, b'responsedata')
        self.assertEqual(meta[b'data'], encoded)

    @unittest.skipUnless(zstd, 'zstd not available')
    def testzstd8mbencodingsinglebyteframes(self):
        reactor = framing.clientreactor(globalui, buffersends=False)

        request, action, meta = reactor.callcommand(b'foo', {})
        for f in meta[b'framegen']:
            pass

        action, meta = sendframe(
            reactor,
            ffs(
                b'%d 2 stream-begin stream-settings eos cbor:b"zstd-8mb"'
                % request.requestid
            ),
        )

        self.assertEqual(action, b'noop')
        self.assertEqual(meta, {})

        result = {
            b'status': b'ok',
        }
        encoded = b''.join(cborutil.streamencode(result))

        compressed = zstd.ZstdCompressor().compress(encoded)
        self.assertEqual(
            zstd.ZstdDecompressor().decompress(compressed), encoded
        )

        chunks = []

        for i in range(len(compressed)):
            char = compressed[i : i + 1]
            if char == b'\\':
                char = b'\\\\'
            action, meta = sendframe(
                reactor,
                ffs(
                    b'%d 2 encoded command-response continuation %s'
                    % (request.requestid, char)
                ),
            )

            self.assertEqual(action, b'responsedata')
            chunks.append(meta[b'data'])
            self.assertTrue(meta[b'expectmore'])
            self.assertFalse(meta[b'eos'])

        # zstd decompressor will flush at frame boundaries.
        self.assertEqual(b''.join(chunks), encoded)

        # End the stream for good measure.
        action, meta = sendframe(
            reactor,
            ffs(b'%d 2 stream-end command-response eos ' % request.requestid),
        )

        self.assertEqual(action, b'responsedata')
        self.assertEqual(meta[b'data'], b'')
        self.assertFalse(meta[b'expectmore'])
        self.assertTrue(meta[b'eos'])

    @unittest.skipUnless(zstd, 'zstd not available')
    def testzstd8mbmultipleresponses(self):
        # We feed in zstd compressed data on the same stream but belonging to
        # 2 different requests. This tests our flushing behavior.
        reactor = framing.clientreactor(
            globalui, buffersends=False, hasmultiplesend=True
        )

        request1, action, meta = reactor.callcommand(b'foo', {})
        for f in meta[b'framegen']:
            pass

        request2, action, meta = reactor.callcommand(b'foo', {})
        for f in meta[b'framegen']:
            pass

        outstream = framing.outputstream(2)
        outstream.setencoder(globalui, b'zstd-8mb')

        response1 = b''.join(
            cborutil.streamencode(
                {
                    b'status': b'ok',
                    b'extra': b'response1' * 10,
                }
            )
        )

        response2 = b''.join(
            cborutil.streamencode(
                {
                    b'status': b'error',
                    b'extra': b'response2' * 10,
                }
            )
        )

        action, meta = sendframe(
            reactor,
            ffs(
                b'%d 2 stream-begin stream-settings eos cbor:b"zstd-8mb"'
                % request1.requestid
            ),
        )

        self.assertEqual(action, b'noop')
        self.assertEqual(meta, {})

        # Feeding partial data in won't get anything useful out.
        action, meta = sendframe(
            reactor,
            ffs(
                b'%d 2 encoded command-response continuation %s'
                % (request1.requestid, outstream.encode(response1))
            ),
        )
        self.assertEqual(action, b'responsedata')
        self.assertEqual(meta[b'data'], b'')

        # But flushing data at both ends will get our original data.
        action, meta = sendframe(
            reactor,
            ffs(
                b'%d 2 encoded command-response eos %s'
                % (request1.requestid, outstream.flush())
            ),
        )
        self.assertEqual(action, b'responsedata')
        self.assertEqual(meta[b'data'], response1)

        # We should be able to reuse the compressor/decompressor for the
        # 2nd response.
        action, meta = sendframe(
            reactor,
            ffs(
                b'%d 2 encoded command-response continuation %s'
                % (request2.requestid, outstream.encode(response2))
            ),
        )
        self.assertEqual(action, b'responsedata')
        self.assertEqual(meta[b'data'], b'')

        action, meta = sendframe(
            reactor,
            ffs(
                b'%d 2 encoded command-response eos %s'
                % (request2.requestid, outstream.flush())
            ),
        )
        self.assertEqual(action, b'responsedata')
        self.assertEqual(meta[b'data'], response2)


if __name__ == '__main__':
    if (3, 6, 0) <= sys.version_info < (3, 6, 4):
        # Python 3.6.0 through 3.6.3 inclusive shipped with
        # https://bugs.python.org/issue31825 and we can't run these
        # tests on those specific versions of Python. Sigh.
        sys.exit(80)
    import silenttestrunner

    silenttestrunner.main(__name__)