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