[tor-bugs] #5651 [Metrics Utilities]: Annotation header with descriptor types

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#5651: Annotation header with descriptor types
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 Reporter:  atagar             |          Owner:     
     Type:  enhancement        |         Status:  new
 Priority:  normal             |      Milestone:     
Component:  Metrics Utilities  |        Version:     
 Keywords:                     |         Parent:     
   Points:                     |   Actualpoints:     
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Comment(by atagar):

 > What are you trying to do, under what constraint?

 The goal of this is to allow a descriptor parser to reliably figure out
 how it should parse files. At present stem and metrics-lib infer a file's
 type by checking its filename and the first line of its contents, for
 instance a first line starting with 'router Unnamed 10.' indicates that
 it's a bridge descriptor. This is pretty hacky.

 Admittedly this is mostly just an issue for metrics descriptors since the
 filename is a reliable indicator for cached files. Using the filename
 feels like a bit of a hack which is why I wanted to apply this to cached
 descriptors too, but it's not horrible. I'm fine with proceeding with this
 as being a metrics-only header. Thoughts, Karsten?

 Cheers! -Damian

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/5651#comment:8>
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