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[tor-commits] [metrics-tasks/master] Add pylinf.py



commit d5d5dac885b4f60a4ed41b197541eef88d381a22
Author: Sathyanarayanan Gunasekaran <gsathya.ceg@xxxxxxxxx>
Date:   Mon Oct 22 20:44:49 2012 +0530

    Add pylinf.py
---
 task-1854/README.txt |    9 +++
 task-1854/pylinf.py  |  178 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 187 insertions(+), 0 deletions(-)

diff --git a/task-1854/README.txt b/task-1854/README.txt
new file mode 100644
index 0000000..646dfea
--- /dev/null
+++ b/task-1854/README.txt
@@ -0,0 +1,9 @@
+Basic algorithm - 
+1) find probability of each relay in pristine consensus
+2) find probability of each relay in modified consensus
+3) for every relay in modified consensus,
+      calculate prob_diff where
+      prob_diff = prob_in_pristine_consensus[relay] - prob_in_modified_consensus[relay]
+4) find largest prob_diff
+5) remove the relays with lowest adv_bw
+6) go to step 2
diff --git a/task-1854/pylinf.py b/task-1854/pylinf.py
new file mode 100644
index 0000000..1f7187a
--- /dev/null
+++ b/task-1854/pylinf.py
@@ -0,0 +1,178 @@
+"""
+Usage - python pylinf.py -h
+Output - A CSV file of the format (without newlines):
+         <valid-after>,
+         <min adv_bw>,
+         <number of relays>,
+         <linf>
+rsync -arz --delete metrics.torproject.org::metrics-recent/relay-descriptors/consensuses in
+"""
+
+import sys
+import math
+import os
+import pygeoip
+import StringIO
+import stem.descriptor
+
+from optparse import OptionParser
+from binascii import b2a_hex, a2b_base64, a2b_hex
+from stem.descriptor.server_descriptor import RelayDescriptor, BridgeDescriptor
+
+class Router:
+    def __init__(self):
+        self.prob = None
+        self.bandwidth = None
+        self.advertised_bw = None
+        self.country = None
+        self.as_no = None
+        self.is_exit = None
+        self.is_guard = None
+
+    def add_router_info(self, values):
+           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.bandwidth = int(values[0].split('=')[1])
+
+    def add_flags(self, values):
+           if "Exit" in values and not "BadExit" in values:
+               self.is_exit = True
+           if "Guard" in values:
+               self.is_guard = True
+
+    def get_as_details(self, ip):
+        try:
+            value = as_db.org_by_addr(str(ip)).split()
+            return value[0]
+        except:
+            return ""
+
+    def get_advertised_bw(self, hex_digest):
+        try:
+            with open(options.server_desc+'/'+hex_digest) as f:
+                data = f.read()
+
+            desc_iter = stem.descriptor.server_descriptor.parse_file(StringIO.StringIO(data))
+            desc_entries = list(desc_iter)
+            desc = desc_entries[0]
+            return min(desc.average_bandwidth, desc.burst_bandwidth, desc.observed_bandwidth)
+        except:
+            return 0
+
+def parse_bw_weights(values):
+    data = {}
+    try:
+        for value in values:
+            key, value = value.split("=")
+            data[key] = float(value) / 10000
+        return data
+    except:
+        return None
+
+def run(file_name):
+    routers = []
+    router = None
+    result_string = []
+    Wed, Wee, Wgd, Wgg = 1, 1, 1, 1
+    # parse consensus
+    with open(file_name, 'r') as f:
+        for line in f.readlines():
+            key = line.split()[0]
+            values = line.split()[1:]
+            if key =='r':
+                router = Router()
+                routers.append(router)
+                router.add_router_info(values)
+            elif key == 's':
+                router.add_flags(values)
+            elif key == 'w':
+                router.add_weights(values)
+            elif key == 'valid-after':
+                valid_after = ' '.join(values)
+            elif key == 'bandwidth-weights':
+                data = parse_bw_weights(values)
+                try:
+                    Wed = data['Wed']
+                    Wee = data['Wee']
+                    Wgd = data['Wgd']
+                    Wgg = data['Wgg']
+                except:
+                    pass
+
+    if len(routers) <= 0:
+        return
+
+    # Find probability of each relay in pristine consensus    
+    total_bw = 0
+    for router in routers:
+        total_bw += router.bandwidth
+
+    for router in routers:
+        router.prob = float(router.bandwidth)/float(total_bw)
+
+    # sort list of routers based on adv_bw
+    routers.sort(key=lambda router: router.advertised_bw)
+
+    while(len(routers)>1):
+        total_bw = 0
+
+        # this is the difference btw probability of choosing a relay in pristine
+        # consensus and probability of choosing the same relay in the modified
+        # consensus; prob_diff is the list of such differences for all relays
+        prob_diff = []
+
+        min_adv_bw = routers[0].advertised_bw
+
+        for router in routers:
+            total_bw += router.bandwidth
+
+        for router in routers:
+            new_prob = float(router.bandwidth)/float(total_bw)
+            diff = abs(new_prob - router.prob)
+            prob_diff.append(diff)
+
+        result_string.append(','.join([valid_after,
+                                      str(min_adv_bw),
+                                      str(len(routers)),
+                                      str(max(prob_diff))]))
+
+        # remove routers with min adv_bw
+        while len(routers) > 0 and routers[0].advertised_bw == min_adv_bw:
+            del routers[0]
+
+    return '\n'.join(result_string)
+
+def parse_args():
+    usage = "Usage - python pyentropy.py [options]"
+    parser = OptionParser(usage)
+
+    parser.add_option("-g", "--geoip", dest="gi_db", default="GeoIP.dat",
+                      help="Input GeoIP database")
+    parser.add_option("-a", "--as", dest="as_db", default="GeoIPASNum.dat",
+                      help="Input AS GeoIP database")
+    parser.add_option("-s", "--server_desc", dest="server_desc",
+                      default="data/relay-descriptors/server-descriptors/", help="Server descriptors directory")
+    parser.add_option("-o", "--output", dest="output", default="entropy.csv",
+                      help="Output filename")
+    parser.add_option("-c", "--consensus", dest="consensus", default="in/consensus",
+                      help="Input consensus dir")
+
+    (options, args) = parser.parse_args()
+
+    return options
+
+if __name__ == "__main__":
+    options = parse_args()
+    gi_db = pygeoip.GeoIP(options.gi_db)
+    as_db = pygeoip.GeoIP(options.as_db)
+
+    with open(options.output, 'w') as f:
+        for file_name in os.listdir(options.consensus):
+            string = run(os.path.join(options.consensus, file_name))
+            if string:
+                f.write("%s\n" % (string))



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