87 lines
2.3 KiB
Python
Executable File
87 lines
2.3 KiB
Python
Executable File
#!/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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Read the RAPPOR'd values on stdin, and sum the bits to produce a Counting Bloom
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filter by cohort. This can then be analyzed by R.
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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 SumBits(params, stdin, stdout):
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csv_in = csv.reader(stdin)
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csv_out = csv.writer(stdout)
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num_cohorts = params.num_cohorts
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num_bloombits = params.num_bloombits
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sums = [[0] * num_bloombits for _ in xrange(num_cohorts)]
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num_reports = [0] * num_cohorts
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for i, row in enumerate(csv_in):
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try:
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(user_id, cohort, unused_bloom, unused_prr, irr) = row
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except ValueError:
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raise RuntimeError('Error parsing row %r' % row)
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if i == 0:
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continue # skip header
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cohort = int(cohort)
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num_reports[cohort] += 1
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if not len(irr) == params.num_bloombits:
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raise RuntimeError(
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"Expected %d bits, got %r" % (params.num_bloombits, len(irr)))
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for i, c in enumerate(irr):
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bit_num = num_bloombits - i - 1 # e.g. char 0 = bit 15, char 15 = bit 0
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if c == '1':
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sums[cohort][bit_num] += 1
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else:
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if c != '0':
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raise RuntimeError('Invalid IRR -- digits should be 0 or 1')
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for cohort in xrange(num_cohorts):
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# First column is the total number of reports in the cohort.
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row = [num_reports[cohort]] + sums[cohort]
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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: sum_bits.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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SumBits(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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