[tor-bugs] #18688 [Tor]: Relays should disable DirPort if RelayBandwidthRate is less than 50kb/s

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#18688: Relays should disable DirPort if RelayBandwidthRate is less than 50kb/s
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     Reporter:  teor    |      Owner:
         Type:  defect  |     Status:  new
     Priority:  Medium  |  Milestone:  Tor: 0.2.???
    Component:  Tor     |    Version:
     Severity:  Normal  |   Keywords:
Actual Points:          |  Parent ID:
       Points:          |   Reviewer:
      Sponsor:          |
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 While I was checking fallback directory mirrors for #17158, I encountered
 some relays that took more than a minute to serve a consensus.

 Most took 150 seconds, which could be caused by a RelayBandwidthRate of 10
 kilobytes a second.

 I suggest that we disable the DirPort on relays with a RelayBandwidthRate
 less than 50 kilobytes a second (30s to serve a consensus).

 This is an incomplete list, starting with those with the highest consensus
 weight:
 217.198.117.122:80
 212.47.250.44:80
 158.69.112.86:80
 50.7.178.34:80
 191.101.251.172:80
 51.254.249.177:80
 188.165.232.40:80
 104.236.38.231:8080
 89.163.225.184:9030
 185.31.230.69:9030
 81.7.14.227:9030
 62.210.238.33:9030
 164.132.56.137:9030
 212.107.149.145:9030
 94.23.165.33:9031

 I'm using this python function from scripts/maint/updateFallbackDirs.py
 (not yet merged to master) to find them:
 {{{
 from stem.descriptor.remote import DescriptorDownloader
 def fallback_consensus_dl_speed(dirip, dirport, nickname, max_time):
   download_failed = False
   downloader = DescriptorDownloader()
   start = datetime.datetime.utcnow()
   # some directory mirrors respond to requests in ways that hang python
   # sockets, which is why we long this line here
   logging.info('Initiating consensus download from %s (%s:%d).', nickname,
                dirip, dirport)
   # there appears to be about 1 second of overhead when comparing stem's
   # internal trace time and the elapsed time calculated here
   TIMEOUT_SLOP = 1.0
   try:
     downloader.get_consensus(endpoints = [(dirip, dirport)],
                              timeout = (max_time + TIMEOUT_SLOP)).run()
   except Exception, stem_error:
     logging.info('Unable to retrieve a consensus from %s: %s', nickname,
                  exc)
     download_failed = True
   elapsed = (datetime.datetime.utcnow() - start).total_seconds()
   if elapsed > max_time:
     status = 'too slow'
     level = logging.WARNING
     download_failed = True
   else:
     status = 'ok'
     level = logging.DEBUG
   logging.log(level, 'Consensus download: %0.1fs %s from %s (%s:%d), ' +
                'max download time %0.1fs.', elapsed, status, nickname,
                dirip, dirport, max_time)
   return download_failed
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18688>
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