Catching exception with async=True

[Robert Smith]

How can I catch an exception when using async=True? This doesn't seem to work (in Windows) when there is not a bash executable available:

try:

    p = sarge.run('bash -c "pwd", async=True, stdout=sarge.Capture(), stderr=sarge.Capture())

except Exception as e:

    print('error')

The traceback is the following:

Exception in thread Thread-1:

Traceback (most recent call last):

  File "C:\Users\user\AppData\Local\Continuum\Anaconda\envs\IDE-env\lib\threadin

g.py", line 810, in __bootstrap_inner

    self.run()

  File "C:\Users\user\AppData\Local\Continuum\Anaconda\envs\IDE-env\lib\threadin

g.py", line 763, in run

    self.__target(*self.__args, **self.__kwargs)

  File "C:\Users\user\AppData\Local\Continuum\Anaconda\envs\IDE-env\lib\site-pac

kages\sarge\__init__.py", line 1136, in run_node

    result = getattr(self, method)(node, input, async)

  File "C:\Users\user\AppData\Local\Continuum\Anaconda\envs\IDE-env\lib\site-pac

kages\sarge\__init__.py", line 1282, in run_command_node

    node.cmd.run(input=input, async=async)

  File "C:\Users\user\AppData\Local\Continuum\Anaconda\envs\IDE-env\lib\site-pac

kages\sarge\__init__.py", line 632, in run

    self.process = p = Popen(self.args, **self.kwargs)

  File "C:\Users\user\AppData\Local\Continuum\Anaconda\envs\IDE-env\lib\subproce

ss.py", line 710, in __init__

    errread, errwrite)

  File "C:\Users\user\AppData\Local\Continuum\Anaconda\envs\IDE-env\lib\subproce

ss.py", line 958, in _execute_child

    startupinfo)

WindowsError: [Error 2] The system cannot find the file specified

Something similar happens in Linux when trying to use a wrong command instead of bash.

Thanks

[Vinay Sajip]

You can't really do this, since async=True runs the command on a background thread, so you can't catch exceptions raised there. You can, however, spin up your own thread and in there call run with async=False - you should then be able to catch any exceptions.

Regards,

Vinay Sajip

---

From: Robert Smith <rsmit...@gmail.com>
To: sarge <python...@googlegroups.com>
Sent: Monday, 5 October 2015, 18:19
Subject: Catching exception with async=True

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[Robert Smith]

Thank you for your response. Using another thread is a bit inconvenient because I'm already using other threads. Maybe I need another approach to circumvent this limitation.

Regards