[metrics-bugs] #29370 [Metrics/Onionperf]: Measure mode with arbitrary tgen traffic models

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#29370: Measure mode with arbitrary tgen traffic models
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 Reporter:  irl                        |          Owner:  metrics-team
     Type:  enhancement                |         Status:  reopened
 Priority:  Low                        |      Milestone:
Component:  Metrics/Onionperf          |        Version:
 Severity:  Normal                     |     Resolution:
 Keywords:  metrics-team-roadmap-2020  |  Actual Points:
Parent ID:  #33321                     |         Points:  1
 Reviewer:                             |        Sponsor:  Sponsor59
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Changes (by karsten):

 * cc: robgjansen, jnewsome (added)


Comment:

 What is the use case here? Is this about providing TGen traffic models
 that are otherwise used in Shadow, but for more complex user models than
 bulk file downloads? OnionPerf users are not expected to generate these
 model files on their own, neither from scratch nor by editing existing
 model files, right?

 One technical problem I see is that TGen models generated by OnionPerf
 contain measurement details like peers (server addresses) or ports (SOCKS
 port of the local Tor client). Would the provided models contain
 placeholders for these parts that OnionPerf fills in before passing models
 to its TGen instances? How does Shadow solve this problem?

 Related to this ticket, we might want to implement #33243 by providing a
 traffic model file rather than by adding more command line parameters. In
 fact, we could take out the `--oneshot` parameter if we provide a traffic
 model file for it.

 Implementation note: OnionPerf already contains a `-m/--traffic-model`
 parameter that does not do anything right now and that we would implement
 here.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29370#comment:6>
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