[tor-bugs] #29056 [Core Tor/Stem]: Implement bandwidth file parser and formater

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#29056: Implement bandwidth file parser and formater
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 Reporter:  juga           |          Owner:  juga
     Type:  defect         |         Status:  assigned
 Priority:  Medium         |      Milestone:
Component:  Core Tor/Stem  |        Version:
 Severity:  Normal         |     Resolution:
 Keywords:  tor-bwauth     |  Actual Points:
Parent ID:                 |         Points:
 Reviewer:                 |        Sponsor:
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Comment (by juga):

 Replying to [comment:4 atagar]:
 > Thanks teor! I'd be happy to proceed with the parser part of this now.

 It's basically implemented in sbws [0], but there're some changes to make
 I guess it should inherit from stem.descriptor.Descriptor. It's not using
 regular expressions but after looking how you implemented other documents,
 might be easier to use them.
 Probably there's no need to separate classes for header and bandwidth
 lines.

 [0]
 https://github.com/torproject/sbws/blob/12ad99d0024cdd65bd73d6ac969cc1e70680f286/sbws/lib/v3bwfile.py#L157,
 https://github.com/torproject/sbws/blob/12ad99d0024cdd65bd73d6ac969cc1e70680f286/sbws/lib/v3bwfile.py#L187,
 https://github.com/torproject/sbws/blob/12ad99d0024cdd65bd73d6ac969cc1e70680f286/sbws/lib/v3bwfile.py#L362,
 https://github.com/torproject/sbws/blob/12ad99d0024cdd65bd73d6ac969cc1e70680f286/sbws/lib/v3bwfile.py#L590,
 https://github.com/torproject/sbws/blob/12ad99d0024cdd65bd73d6ac969cc1e70680f286/sbws/lib/v3bwfile.py#L600

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29056#comment:9>
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