@cee {<jsondict|} spec? Was: Systemd service and structured logging

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Hi Mantas Mikulėnas and other members,

This looks nice:

  @cee: {<jsondict>}

For me this is new. I could find some scattered information about this.

Is there an official spec for this logging syntax?

I think it would be nice if a systemd service could log structured logs like
this via stdout.

Regards,
  Thomas Güttler


Am 06.05.19 um 11:09 schrieb Mantas Mikulėnas:
On Mon, May 6, 2019 at 10:09 AM Thomas Güttler <guettliml@xxxxxxxxxxxxxxxxxx <mailto:guettliml@xxxxxxxxxxxxxxxxxx>> wrote:

    Am 03.05.19 um 13:29 schrieb Jérémy ROSEN:
     > if you want the whole power of structured logs, you need to use the journald API


On the other hand, JSON parsing might be a useful addition to journald, as apparently "@cee: {<jsondict>}" is a quite common syslog format.

     > I am not sure in what language your program is written, but if you are using C, it's pretty trivial to do
     > (and i'm pretty sure most bindings are trivial to use too)


    Yes, this would work.


    Solution 1:
       My service (written Python) uses the journald API.
       Disadvantage: My script can't be run under a different environment (without journald)


I would suggest implementing support for multiple logging backends – don't call journald APIs directly and don't print out JSON directly, but have abstract functions such as log_info(text, **kvpairs) or something such. That's what many programs already do for file/syslog/journal backends. (Possibly just use the `logging` module in python?)

--
Mantas Mikulėnas

--
Thomas Guettler http://www.thomas-guettler.de/
I am looking for feedback: https://github.com/guettli/programming-guidelines
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