[tor-bugs] #12882 [Onionoo]: Logging Framework

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#12882: Logging Framework
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     Reporter:  iwakeh       |      Owner:  iwakeh
         Type:  enhancement  |     Status:  assigned
     Priority:  normal       |  Milestone:
    Component:  Onionoo      |    Version:
   Resolution:               |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |
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Comment (by karsten):

 Agreed about the suggested two sinks for metrics and logging.  That
 reminds me of another important requirement: the logging part should be
 split up into informational messages and warnings or errors.  The former
 can be written to files in a "logrotate" style, the latter must be
 included in emails sent out by cron.

 Let me explain how this works right now: the cron part of Onionoo uses
 `System.out` for informational messages and `System.err` for errors and
 warnings.  The Ant target `"run"` has `error="errors"` set, so that errors
 and warnings are written (not appended) to the local `errors` file.  Cron
 calls Ant with the following command: `ant run >> log && cat errors`.
 That means that informational messages are appended to `log` and
 everything in the `errors` file gets mailed to me once the cronjob
 finishes.

 For completeness, here's how logging in Tomcat is currently used: there
 are a few calls to `System.err` (which could also be `System.out` calls)
 in the server package.  Those lines are appended to Tomcat's
 `catalina.out` file.  Any other file would be fine, too, this is just
 where it happens to log right now.

 As for identifying errors, warnings, and informational log entries, I
 think the current `System.out` and `System.err` statements might be a fine
 start.  All these can be turned into calls to the logging framework.

 And to answer your question: no, I don't process logs automatically.

 Want to apply one of the mentioned logging frameworks and try it in the
 Vagrant environment?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12882#comment:5>
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