udp_multicast interface: support windows#1914
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Neither the SO_TIMESTAMPNS / via recvmsg() method, nor the SIOCGSTAMP / ioctl() method for obtaining the packet timestamp is supported on Windows. This code adds a fallback to datetime, and switches to recvfrom() so that the udp_multicast bus becomes usable on windows.
on windows, the example would otherwise cause an _enter_buffered_busy fatal error, notifier shutdown and bus shutdown are racing eachother...
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@thseiler There are two Multicast tests in Is there a reason to use datetime intead of |
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@zariiii9003 Thanks a lot for the guidance. The |
can/interfaces/udp_multicast/bus.py
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| if ( | ||
| error.errno == errno.ENOPROTOOPT | ||
| or error.errno == errno.EINVAL | ||
| or error.errno == errno.WSAEINVAL |
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This could cause an AttributeError on Linux. You could redefine WSAEINVAL as a module constant.
test/back2back_test.py
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| @unittest.skipUnless( | ||
| IS_UNIX and not (IS_CI and IS_OSX), | ||
| "only supported on Unix systems (but not on macOS at Travis CI and GitHub Actions)", | ||
| (IS_UNIX and not (IS_CI and IS_OSX)) or IS_WINDOWS, |
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You can replace this with @unittest.skipIf(IS_CI and IS_OSX, ...
test/back2back_test.py
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| @unittest.skipUnless( | ||
| IS_UNIX and not (IS_TRAVIS or (IS_CI and IS_OSX)), | ||
| "only supported on Unix systems (but not on Travis CI; and not on macOS at GitHub Actions)", | ||
| (IS_UNIX and not (IS_TRAVIS or (IS_CI and IS_OSX))) or IS_WINDOWS, |
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same here, we're not using Travis anymore anyway.
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The comment suggests skipping the UdpMulticast tests on macOS was necessary because of an issue with Travis CI. However, the tests may well work in the .github/workflow macOS environment, and skipping them is no longer necessary. Would you agree this is worth a test?
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Yes, that might work. There's still a formatting issue, use black to fix it.
zariiii9003
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zariiii9003
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Looks good, thank you 👍
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Neither the recvmsg() / SO_TIMESTAMPNS method, nor the SIOCGSTAMP / ioctl() method for obtaining the packet timestamp is supported on Windows. This code switches from recvmsg to recvfrom() so that the udp_multicast works on Windows.
To support precise timestamps on Windows, Python would need to expose the WSArecvmsg() function first; see here. This PR is falling back to time.time() for now...