[metrics-bugs] #22983 [Metrics/Library]: Add a Descriptor subinterface and implementation for Tor web server logs

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#22983: Add a Descriptor subinterface and implementation for Tor web server logs
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 Reporter:  iwakeh           |          Owner:  metrics-team
     Type:  enhancement      |         Status:  needs_revision
 Priority:  Medium           |      Milestone:  metrics-lib 2.2.0
Component:  Metrics/Library  |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:  metrics-2017     |  Actual Points:
Parent ID:                   |         Points:
 Reviewer:                   |        Sponsor:
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Comment (by iwakeh):

 Replying to [comment:50 karsten]:
 > Agreed with all points above except one:

 Fine.

 >
 > ...
 > Does that mean we should provide a general-purpose log parser? Probably
 not.

 This is my main concern here.

 > ... In the parser we don't have to provide getters for fields that we
 don't care about, like user-agent string. But we should be prepared to
 find request methods GET, HEAD, POST, or really anything else in log lines
 we're given.

 Maybe, the general rule here could be that the parser/validator accepts
 the format in a backward compatible way, i.e., log lines that have been
 valid at some point will be parsed/valid in future?  This would enable
 parsing of HEAD from your example above and also accommodate changes life
 accepting FTP in future with the benefit of having a defined pattern of
 valid log lines that is more restrictive than a general log parser.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22983#comment:51>
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