[Bugs] #1889 HIGH: Print stack when encountering an exception during log formatting

[Sugar Labs Bugs]

#1889: Print stack when encountering an exception during log formatting
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    Reporter:  sascha_silbe  |          Owner:  sascha_silbe     
        Type:  enhancement   |         Status:  new              
    Priority:  High          |      Milestone:  0.88.x           
   Component:  sugar         |        Version:  Git as of bugdate
    Severity:  Blocker       |       Keywords:  r+               
Distribution:  Unspecified   |   Status_field:  Assigned         
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Comment(by sascha_silbe):

 Replying to [comment:4 tomeu]:
 > Thanks, though would be great if we could remove the logging-specific
 lines from the traceback.
 I just looked into that, but don't consider it useful because:

 1. print_exception():
  We could print the exception as a simple string instead of as a
 traceback, but I think that would make it harder to understand what's
 going on. Compare
 {{{
    Traceback (most recent call last):
      File "/usr/lib/python2.5/logging/__init__.py", line 744, in emit
        msg = self.format(record)
      File "/usr/lib/python2.5/logging/__init__.py", line 630, in format
        return fmt.format(record)
      File "/usr/lib/python2.5/logging/__init__.py", line 418, in format
        record.message = record.getMessage()
      File "/usr/lib/python2.5/logging/__init__.py", line 288, in
 getMessage
        msg = msg % self.args
    TypeError: int argument required
 }}}
 with
 {{{
 Exception in log handler: int argument required
 }}}

 2. print_stack():
  We could apply some magic to remove the last 8 entries from the
 traceback, but it would be somewhat complex and potentially fragile. Given
 that exceptions in log handlers are rare, I'd rather apply KISS than trim
 a few unnecessary lines.

-- 
Ticket URL: <http://bugs.sugarlabs.org/ticket/1889#comment:5>
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