[systemd-devel] python - reading the journal

David Strauss david at davidstrauss.net
Sun Feb 17 18:17:22 PST 2013

Great progress!

A few more remarks:
 * Class methods ought to be verbs. "this_machine" and "this_boot" are
the key ones that come to mind. Maybe "add_machine_match" and
 * In methods like "this_machine" that have special handling for the
None value as "myself," the function should use something more
meaningful. You could even define a constant like CURRENT_MACHINE as
None. It's just unclear in calling code that
myjournal.this_machine(None) matches on the current machine versus,
say, no machine field, an empty machine field, or *any* value in the
machine field.
 * "get_next" should note in its documentation that, combined with the
native C, one can use a Pythonic iterator directly. I would even make
this function private to encourage use of the iterator syntax.
 * The "except" handler for _convert_unicode() should be more
specific. I think it's generally dangerous to have catch-all
exceptions, especially ones that fail silently. I couldn't find in the
Python docs for 2 or 3 what the exception would be.

David Strauss
   | david at davidstrauss.net
   | +1 512 577 5827 [mobile]

On Fri, Feb 15, 2013 at 9:28 AM, Steven Hiscocks
<steven-systemd at hiscocks.me.uk> wrote:
> On 11/02/13 05:49, Zbigniew Jędrzejewski-Szmek wrote:
>> On Fri, Feb 08, 2013 at 10:20:57PM +0000, Steven Hiscocks wrote:
>>> I thought the easiest way was to just inherit the Journal (now
>>> _Journal), replacing __new__ with all the python RunString stuff.
>>> https://github.com/kwirk/systemd/commit/9003fdbc69577840ab6a1501a1c49f7377b6124d
>> Hi Steven,
>> comments on your patch:
>> The default conversion must be bytes, otherwise every new binary
>> message field that this module doesn't know about will cause failure.
>> It is better to default to bytes.
> Currently I've put default to unicode, which falls back to bytes if their is
> an exception is raised.
>> ...
>> Zbyszek
> I've been away on a work trip this week so haven't been able to make much
> progress. I've pushed some changes to a branch on github:
> https://github.com/kwirk/systemd/tree/python-systemd-reader
> --
> Steven Hiscocks

David Strauss
   | david at davidstrauss.net
   | +1 512 577 5827 [mobile]

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