sstable-summary.py

#!/usr/bin/env python3

import argparse
import binascii
import struct

cmdline_parser = argparse.ArgumentParser()
cmdline_parser.add_argument('summary_file', help='summary file to parse')

args = cmdline_parser.parse_args()

f = open(args.summary_file, 'rb')
data = f.read()
f.close()

offset = 0

(min_interval, entries_count, entries_size, sampling_level, size_at_full_sampling) = struct.unpack_from('>llqll', data)
header_size = 24

print('Minimal interval:\t{}'.format(min_interval))
print('Number of entires:\t{}'.format(entries_count))
print('Summary entries size:\t{}'.format(entries_size))
print('Sampling level:\t\t{}'.format(sampling_level))
print('Size at full sampling:\t{}'.format(size_at_full_sampling))

positions = list(struct.unpack_from('<{}l'.format(entries_count), data, header_size))
positions.append(entries_size)

offset = header_size + entries_size

start_length = struct.unpack_from('>l', data, offset)[0]
start = struct.unpack_from('>{}s'.format(start_length), data, offset + 4)[0]
offset += start_length + 4

end_length = struct.unpack_from('>l', data, offset)[0]
end = struct.unpack_from('>{}s'.format(end_length), data, offset + 4)[0]
offset += end_length + 4

print('First key:\t\t{}'.format(binascii.hexlify(start)))
print('Last key:\t\t{}'.format(binascii.hexlify(end)))
print('Total summary size:\t{}'.format(offset))
print('Entries:')

for i in range(0, entries_count):
    start = positions[i]
    end = positions[i + 1] - 8

    (key, position) = struct.unpack_from('<{}sq'.format(end - start), data, header_size + start)
    
    print('\tKey {} at position {}'.format(binascii.hexlify(key), position))