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process_consensuses_slim.py
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import pathsim
import stem.descriptor.reader
import stem.descriptor
import stem
from stem import Flag
import os
import os.path
import cPickle as pickle
def read_descriptors(descriptors, descriptor_dir, skip_listener):
"""Add to descriptors contents of descriptor archive in descriptor_dir."""
num_descriptors = 0
num_relays = 0
print('Reading descriptors from: {0}'.format(descriptor_dir))
reader = stem.descriptor.reader.DescriptorReader(descriptor_dir,
validate=True)
reader.register_skip_listener(skip_listener)
with reader:
for desc in reader:
if (num_descriptors % 10000 == 0):
print('{0} descriptors processed.'.format(num_descriptors))
num_descriptors += 1
if (desc.fingerprint not in descriptors):
descriptors[desc.fingerprint] = {}
num_relays += 1
descriptors[desc.fingerprint]\
[pathsim.timestamp(desc.published)] = desc
print('#descriptors: {0}; #relays:{1}'.\
format(num_descriptors,num_relays))
def process_consensuses(in_dirs, initial_descriptor_dir):
"""For every input consensus, finds the descriptors published most recently before the descriptor times listed for the relays in that consensus, records state changes indicated by descriptors published during the consensus fresh period, and writes out pickled consensus and descriptor objects with the relevant information.
Inputs:
in_dirs: list of (consensus in dir, descriptor in dir,
processed descriptor out dir) triples *in order*
initial_descriptor_dir: Contains descriptors to initialize processing.
"""
water_filling = True
descriptors = {}
def skip_listener(path, exception):
print('ERROR [{0}]: {1}'.format(path.encode('ascii', 'ignore'), exception.__unicode__().encode('ascii','ignore')))
print('Outputting slim classes.')
# initialize descriptors
if (initial_descriptor_dir is not None):
read_descriptors(descriptors, initial_descriptor_dir, skip_listener)
for in_consensuses_dir, in_descriptors, desc_out_dir in in_dirs:
# read all descriptors into memory
read_descriptors(descriptors, in_descriptors, skip_listener)
# output pickled consensuses, dict of most recent descriptors, and
# list of hibernation status changes
num_consensuses = 0
pathnames = []
for dirpath, dirnames, fnames in os.walk(in_consensuses_dir):
for fname in fnames:
pathnames.append(os.path.join(dirpath,fname))
pathnames.sort()
for pathname in pathnames:
filename = os.path.basename(pathname)
if (filename[0] == '.'):
continue
print('Processing consensus file {0}'.format(filename))
cons_f = open(pathname, 'rb')
descriptors_out = {}
hibernating_statuses = [] # (time, fprint, hibernating)
cons_valid_after = None
cons_fresh_until = None
cons_bw_weights = None
cons_bwweightscale = None
relays = {}
num_not_found = 0
num_found = 0
for r_stat in stem.descriptor.parse_file(cons_f, validate=True):
if (cons_valid_after == None):
cons_valid_after = r_stat.document.valid_after
# compute timestamp version once here
valid_after_ts = pathsim.timestamp(cons_valid_after)
if (cons_fresh_until == None):
cons_fresh_until = r_stat.document.fresh_until
# compute timestamp version once here
fresh_until_ts = pathsim.timestamp(cons_fresh_until)
if (cons_bw_weights == None):
cons_bw_weights = r_stat.document.bandwidth_weights
if (cons_bwweightscale == None) and \
('bwweightscale' in r_stat.document.params):
cons_bwweightscale = r_stat.document.params[\
'bwweightscale']
relays[r_stat.fingerprint] = pathsim.RouterStatusEntry(\
r_stat.fingerprint, r_stat.flags, \
r_stat.bandwidth, water_filling=water_filling)
# find most recent unexpired descriptor published before
# the publication time in the consensus
# and status changes in fresh period (i.e. hibernation)
pub_time = pathsim.timestamp(r_stat.published)
desc_time = 0
descs_while_fresh = []
desc_time_fresh = None
# get all descriptors with this fingerprint
if (r_stat.fingerprint in descriptors):
for t,d in descriptors[r_stat.fingerprint].items():
# update most recent desc seen before cons pubtime
# allow pubtime after valid_after but not fresh_until
if (valid_after_ts-t <\
pathsim.TorOptions.router_max_age) and\
(t <= pub_time) and (t > desc_time) and\
(t <= fresh_until_ts):
desc_time = t
# store fresh-period descs for hibernation tracking
if (t >= valid_after_ts) and \
(t <= fresh_until_ts):
descs_while_fresh.append((t,d))
# find most recent hibernating stat before fresh period
# prefer most-recent descriptor before fresh period
# but use oldest after valid_after if necessary
if (desc_time_fresh == None):
desc_time_fresh = t
elif (desc_time_fresh < valid_after_ts):
if (t > desc_time_fresh) and\
(t <= valid_after_ts):
desc_time_fresh = t
else:
if (t < desc_time_fresh):
desc_time_fresh = t
# output best descriptor if found
if (desc_time != 0):
num_found += 1
# store discovered recent descriptor
desc = descriptors[r_stat.fingerprint][desc_time]
descriptors_out[r_stat.fingerprint] = \
pathsim.ServerDescriptor(desc.fingerprint, desc.hibernating, desc.address)
# store hibernating statuses
if (desc_time_fresh == None):
raise ValueError('Descriptor error for {0}:{1}.\n Found descriptor before published date {2}: {3}\nDid not find descriptor for initial hibernation status for fresh period starting {4}.'.format(r_stat.nickname, r_stat.fingerprint, pub_time, desc_time, valid_after_ts))
desc = descriptors[r_stat.fingerprint][desc_time_fresh]
cur_hibernating = desc.hibernating
# setting initial status
hibernating_statuses.append((0, desc.fingerprint,\
cur_hibernating))
if (cur_hibernating):
print('{0}:{1} was hibernating at consenses period start'.format(desc.nickname, desc.fingerprint))
descs_while_fresh.sort(key = lambda x: x[0])
for (t,d) in descs_while_fresh:
if (d.hibernating != cur_hibernating):
cur_hibernating = d.hibernating
hibernating_statuses.append(\
(t, d.fingerprint, cur_hibernating))
if (cur_hibernating):
print('{0}:{1} started hibernating at {2}'\
.format(d.nickname, d.fingerprint, t))
else:
print('{0}:{1} stopped hibernating at {2}'\
.format(d.nickname, d.fingerprint, t))
else:
# print(\
# 'Descriptor not found for {0}:{1}:{2}'.format(\
# r_stat.nickname,r_stat.fingerprint, pub_time))
num_not_found += 1
# output pickled consensus, recent descriptors, and
# hibernating status changes
if (cons_valid_after != None) and\
(cons_fresh_until != None):
consensus = pathsim.NetworkStatusDocument(\
cons_valid_after, cons_fresh_until, cons_bw_weights,\
cons_bwweightscale, relays)
hibernating_statuses.sort(key = lambda x: x[0],\
reverse=True)
outpath = os.path.join(desc_out_dir,\
cons_valid_after.strftime(\
'%Y-%m-%d-%H-%M-%S-network_state'))
f = open(outpath, 'wb')
pickle.dump(consensus, f, pickle.HIGHEST_PROTOCOL)
pickle.dump(descriptors_out,f,pickle.HIGHEST_PROTOCOL)
pickle.dump(hibernating_statuses,f,pickle.HIGHEST_PROTOCOL)
f.close()
print('Wrote descriptors for {0} relays.'.\
format(num_found))
print('Did not find descriptors for {0} relays\n'.\
format(num_not_found))
else:
print('Problem parsing {0}.'.format(filename))
num_consensuses += 1
cons_f.close()
print('# consensuses: {0}'.format(num_consensuses))