Gracefully handle errors when binding SocketCAN fails #1771
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The parent class BusABC expects to be shutdown properly, checked via its self._is_shutdown flag during object deletion. But that flag is only set when the base class shutdown() is called, which doesn't happen if instantiation of the concrete class failed in can.Bus(). So there is no way to avoid the warning message "SocketcanBus was not properly shut down" if the constructor raised an exception. This change addresses that issue for the SocketCAN interface, by catching an OSError exception in bind_socket(), logging it, and calling self.shutdown().
This was referenced Apr 24, 2024
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The alternative approach is now proposed in #1774. This PR could still be useful in addition, to have a proper error log message. If that is desired... |
hardbyte
approved these changes
Apr 29, 2024
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Adjusted as requested. Thanks for your consideration. |
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The parent class
BusABCexpects to be shutdown properly, checked via itsself._is_shutdownflag during object deletion. But that flag is only set when the base class'shutdown()is called, which doesn't happen if instantiation of the concrete class failed incan.Bus(). So there is no way to avoid the warning message "SocketcanBus was not properly shut down" if the constructor raised an exception.This change addresses that issue for the SocketCAN interface, by catching an OSError exception in
bind_socket(), logging it, and callingself.shutdown()before re-raising the exception.There might be a better approach which also works for the other backends? The flag could be initialized to
Trueand only reset toFalsewhen theBusABCconstructor runs (which happens last in derived classes)?Thus leaving this as a draft for further discussion.