commit ed9b401f0a553274e07055b067406d255e61bc98 Author: Damian Johnson atagar@torproject.org Date: Fri Aug 29 09:17:05 2014 -0700

Example for getting number of relays a bw auth has a measurement for

Including a script I just whipped up for Sebastian to see if there was an issue with the bandwidth authorities. This gives a fine spot to describe a bit more about how the Tor network works. --- docs/tutorials/double_double_toil_and_trouble.rst | 5 ++ .../examples/votes_by_bandwidth_authorities.rst | 64 ++++++++++++++++++++ 2 files changed, 69 insertions(+)

diff --git a/docs/tutorials/double_double_toil_and_trouble.rst b/docs/tutorials/double_double_toil_and_trouble.rst index 4d1a672..06a6c08 100644 --- a/docs/tutorials/double_double_toil_and_trouble.rst +++ b/docs/tutorials/double_double_toil_and_trouble.rst @@ -97,3 +97,8 @@ Descriptors Compares the votes of two directory authorities, in this case moria1 and maatuska with a special interest in the 'Running' flag.

+* `Votes by Bandwidth Authorities <examples/votes_by_bandwidth_authorities.html>`_ + + Provides information about the current votes from Tor's Bandwidth + Authorities. + diff --git a/docs/tutorials/examples/votes_by_bandwidth_authorities.rst b/docs/tutorials/examples/votes_by_bandwidth_authorities.rst new file mode 100644 index 0000000..f1a4d67 --- /dev/null +++ b/docs/tutorials/examples/votes_by_bandwidth_authorities.rst @@ -0,0 +1,64 @@ +Votes by Bandwidth Authorities +============================== + +.. image:: /_static/buttons/back.png + :target: ../double_double_toil_and_trouble.html + +Tor takes into account a relay's throughput when picking a route through the +Tor network for its circuits. That is to say large, fast relays receive more +traffic than small ones since they can better service the load. + +To determine a relay's throughput special authorities, called **bandwidth +authorities**, take periodic measurements using them. The `lifecycle of new Tor +relays https://blog.torproject.org/blog/lifecycle-of-a-new-relay`_ is a bit +more complicated than that, but that's the general idea. + +Bandwidth authorities include their measurements in their votes. The following +gets their current votes then prints how many relays it had a measurement for. + +:: + + from stem.descriptor import remote + + # request votes from all the bandwidth authorities + + queries = {} + downloader = remote.DescriptorDownloader() + + for authority in remote.get_authorities().values(): + if authority.nickname not in ('moria1', 'gabelmoo', 'maatuska', 'tor26'): + continue # not a bandwidth authority + + queries[authority.nickname] = downloader.query( + '/tor/status-vote/current/authority', + endpoints = [(authority.address, authority.dir_port)], + ) + + for authority_name, query in queries.items(): + try: + print "Getting %s's vote from %s:" % (authority_name, query.download_url) + + measured, unmeasured = 0, 0 + + for desc in query.run(): + if desc.measured: + measured += 1 + else: + unmeasured += 1 + + print ' %i measured entries and %i unmeasured' % (measured, unmeasured) + except Exception as exc: + print " failed to get the vote (%s)" % exc + +:: + + % python bandwidth_auth_measured_counts.py + Getting gabelmoo's vote from http://212.112.245.170:80/tor/status-vote/current/authority: + 5935 measured entries and 1332 unmeasured + Getting tor26's vote from http://86.59.21.38:80/tor/status-vote/current/authority: + 5735 measured entries and 1690 unmeasured + Getting moria1's vote from http://128.31.0.39:9131/tor/status-vote/current/authority: + 6647 measured entries and 625 unmeasured + Getting maatuska's vote from http://171.25.193.9:443/tor/status-vote/current/authority: + 6313 measured entries and 1112 unmeasured +