[tor-bugs] #28637 [Core Tor/Tor]: Improve general WTF-PAD code quality and maintainability

[Tor Bug Tracker & Wiki]

#28637: Improve general WTF-PAD code quality and maintainability
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     Reporter:  asn      |      Owner:  (none)
         Type:  defect   |     Status:  new
     Priority:  Medium   |  Milestone:  Tor: unspecified
    Component:  Core     |    Version:
  Tor/Tor                |   Keywords:  wtf-pad, tor-relay, tor-cell,
     Severity:  Normal   |  padding
Actual Points:           |  Parent ID:  #28631
       Points:           |   Reviewer:
      Sponsor:           |
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 This is a master ticket for tasks that can be done after WTF-PAD gets
 merged, and maybe even after 0.4.0 gets released. They represent tasks
 that increase code quality and reduce tech debt.

 Example:

 - Improve the probability distribution API. Instead of using nameless dist
 params, instead have the caller instantiate a struct with the right params
 for each distribution.

 - The above will also allow callers to specify a genpareto distribution
 with configurable `mu` parameter.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28637>
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