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#!/usr/bin/python
#
# Copyright 2014 Google Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Given a list of candidates on stdin, produce a file of hashes ("map file").
"""
import csv
import sys
import rappor
def HashCandidates(params, stdin, stdout):
num_bloombits = params.num_bloombits
csv_out = csv.writer(stdout)
for line in stdin:
word = line.strip()
row = [word]
for cohort in xrange(params.num_cohorts):
bloom_bits = rappor.get_bloom_bits(word, cohort, params.num_hashes,
num_bloombits)
for bit_to_set in bloom_bits:
# bits are indexed from 1. Add a fixed offset for each cohort.
# NOTE: This detail could be omitted from the map file format, and done
# in R.
row.append(cohort * num_bloombits + (bit_to_set + 1))
csv_out.writerow(row)
def main(argv):
try:
filename = argv[1]
except IndexError:
raise RuntimeError('Usage: hash_candidates.py <params file>')
with open(filename) as f:
try:
params = rappor.Params.from_csv(f)
except rappor.Error as e:
raise RuntimeError(e)
HashCandidates(params, sys.stdin, sys.stdout)
if __name__ == '__main__':
try:
main(sys.argv)
except RuntimeError, e:
print >>sys.stderr, e.args[0]
sys.exit(1)
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