commit e7f15593954d88ad1de449c23581eb4b007ad539 Author: Karsten Loesing karsten.loesing@gmx.net Date: Tue Jul 24 09:53:29 2012 +0200

Fix the way how advertised bandwidth is supposed to be used (#6232).

A relay's advertised bandwidth is not supposed to be used as replacement for a potentially missing consensus bandwidth. The idea is to compare path selection probability based on reported vs measured bandwidth. There should be an entropy (and max entropy) based on advertised bandwidths in addition to the same numbers for consensus weights.

Also removing the hex_digest field, because we only need it once when looking up the advertised bandwidth.

Oh, and changing the default advertised bandwidth from None to 0, so that we can calculate with the result. There may always be single server descriptors missing. --- task-6232/pyentropy.py | 16 ++++++---------- 1 files changed, 6 insertions(+), 10 deletions(-)

diff --git a/task-6232/pyentropy.py b/task-6232/pyentropy.py index ba11d24..74c5699 100644 --- a/task-6232/pyentropy.py +++ b/task-6232/pyentropy.py @@ -28,7 +28,6 @@ from stem.descriptor.server_descriptor import RelayDescriptor, BridgeDescriptor

class Router: def __init__(self): - self.hex_digest = None self.bandwidth = None self.advertised_bw = None self.country = None @@ -37,17 +36,14 @@ class Router: self.is_guard = None

def add_router_info(self, values): - self.hex_digest = b2a_hex(a2b_base64(values[2]+"=")) + hex_digest = b2a_hex(a2b_base64(values[2]+"=")) + self.advertised_bw = self.get_advertised_bw(hex_digest) ip = values[5] self.country = gi_db.country_code_by_addr(ip) self.as_no = self.get_as_details(ip)

def add_weights(self, values): - self.advertised_bw = self.get_advertised_bw() - if self.advertised_bw: - self.bandwidth = self.advertised_bw - else: - self.bandwidth = int(values[0].split('=')[1]) + self.bandwidth = int(values[0].split('=')[1])

def add_flags(self, values): if "Exit" in values and not "BadExit" in values: @@ -62,9 +58,9 @@ class Router: except: return None

- def get_advertised_bw(self): + def get_advertised_bw(self, hex_digest): try: - with open(options.server_desc+self.hex_digest) as f: + with open(options.server_desc+hex_digest) as f: data = f.read()

desc_iter = stem.descriptor.server_descriptor.parse_file(StringIO.StringIO(data)) @@ -72,7 +68,7 @@ class Router: desc = desc_entries[0] return min(desc.average_bandwidth, desc.burst_bandwidth, desc.observed_bandwidth) except: - return None + return 0

def parse_bw_weights(values): data = {}