[tor-bugs] #29057 [Core Tor/sbws]: Adapt bandwidth file classes to be compatible with stem (descriptors, etc) documents

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#29057: Adapt bandwidth file classes to be compatible with stem (descriptors, etc)
documents
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 Reporter:  juga           |          Owner:  juga
     Type:  defect         |         Status:  assigned
 Priority:  Medium         |      Milestone:  sbws: 1.1.x-final
Component:  Core Tor/sbws  |        Version:
 Severity:  Normal         |     Resolution:
 Keywords:                 |  Actual Points:
Parent ID:  #28684         |         Points:
 Reviewer:                 |        Sponsor:
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Comment (by juga):

 After checking stem's implementation, it could be used in sbws for:
 - parsing existing bandwidth files: this would be useful for tests and
 creating graphs (made with script outside of sbws package), though
 there're already methods in sbws implementing this and to use stem's one,
 sbws will need to implement methods that take as input the dictionaries
 stem creates.
 - generate the bandwidth file: this is would be more useful, though it's
 also already implemented in sbws and sbws would need to implement methods
 to pass to stem the data in the format it needs (dictionaries).

 To don't depend on the stem implementation until it's released, i think
 this might be moved to a later milestone.

 What it can still be changed in stem, is the way the headers and bandwidth
 lines attributes are declared, which specify the type for each attribute
 (https://gitweb.torproject.org/stem.git/tree/stem/descriptor/bandwidth_file.py#n61).
 The header could just be a copy of what is implemented in stem (until
 released).
 However, the bandwidth lines are not converted to their types, just parsed
 from/to strings, so this would be a new way to declare the bandwidth
 lines.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29057#comment:1>
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