Yaniv Bronhaim has posted comments on this change.

Change subject: Introducing context manager to terminate async processes on 
internal fail
......................................................................


Patch Set 1:

(2 comments)

https://gerrit.ovirt.org/#/c/51407/1/lib/vdsm/utils.py
File lib/vdsm/utils.py:

Line 704: 
Line 705: def terminator(proc, logger):
Line 706:     '''
Line 707:     A context manager for taking care for killing process on failure.
Line 708:     The first exception will be remembered and re-raised.
> I think this should always terminate the process, not only after errors, li
but in most of the places you just want to kill on error, and let the process 
continue, or wait until it finishes

this decorator just guaranty that we kill the process on fail. we could do it 
inside asyncProc for each method, i think its more reasonable
Line 709: 
Line 710:     Sample usage:
Line 711:     proc = ExecCmd('cmd', sync=False)
Line 712:     with terminator(proc, logger) as rollback:


Line 733:         try:
Line 734:             proc.kill()
Line 735:         except Exception:
Line 736:             self._log.error("Failed to kill subprocess")
Line 737:         six.reraise(*exc_info)
> It will be much simpler to use a function instead of a class with __enter__
I don't think I understand what you suggest. where do you plan to use such 
contextmanager?
Line 738: 
Line 739: 
Line 740: def traceback(on="", msg="Unhandled exception"):
Line 741:     """


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Gerrit-MessageType: comment
Gerrit-Change-Id: I003cce39d62dba5644937fafaf2c6e24c526c075
Gerrit-PatchSet: 1
Gerrit-Project: vdsm
Gerrit-Branch: master
Gerrit-Owner: Yaniv Bronhaim <ybron...@redhat.com>
Gerrit-Reviewer: Dan Kenigsberg <dan...@redhat.com>
Gerrit-Reviewer: Jenkins CI
Gerrit-Reviewer: Nir Soffer <nsof...@redhat.com>
Gerrit-Reviewer: Yaniv Bronhaim <ybron...@redhat.com>
Gerrit-Reviewer: gerrit-hooks <automat...@ovirt.org>
Gerrit-HasComments: Yes
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