[tor-bugs] #28494 [Core Tor/Stem]: Please provide an equivalent for UnparseableDescriptor from metrics-lib

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#28494: Please provide an equivalent for UnparseableDescriptor from metrics-lib
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 Reporter:  irl            |          Owner:  atagar
     Type:  enhancement    |         Status:  new
 Priority:  Medium         |      Milestone:
Component:  Core Tor/Stem  |        Version:
 Severity:  Normal         |     Resolution:
 Keywords:                 |  Actual Points:
Parent ID:                 |         Points:
 Reviewer:                 |        Sponsor:
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Comment (by atagar):

 Hi irl, sorry about the delay. You filed quite a few interesting tickets.
 :P

 Are you using parse_file() or a DescriptorReader? parse_file() is
 documented as only raising TypeErrors when unable to determine the
 descriptor type ("**TypeError** if we can't match the contents of the file
 to a descriptor type"), and from my read of the code looks like it does.
 The DescriptorReader however raises TypeErrors as a catch-all for parsing
 failures.

 Honestly I'm a little tempted to deprecate our DescriptorReader. I wrote
 it for Karsten way back when I first began Stem and he asked for a class
 that tracked when unprocessed files become available on disk. I've never
 used it, and it's such a specialized use case I'm unaware of anyone else
 using it either.

 Do you need this class or would parse_file() work just as well for you?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28494#comment:1>
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