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annotate lemuriformes/table_size.py @ 17:4793f99b73e0

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[lemuriformes] utility functions
author Jeff Hammel <k0scist@gmail.com>
date Sun, 10 Dec 2017 17:42:52 -0800
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1 #!/usr/bin/env python
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2 # -*- coding: utf-8 -*-
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3
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4 """
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5 monitor SQL table size
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6 """
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7
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8 import argparse
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9 import csv
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10 import os
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11 import sys
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12 import time
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13 from .cli import ConfigurationParser
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14 from .url2sql import url2sql
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15
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16
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17 def main(args=sys.argv[1:]):
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18 """CLI"""
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19
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20 # parse command line
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21 parser = ConfigurationParser(description=__doc__)
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22 parser.add_argument('database', type=url2sql,
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23 help="URL of SQL database to connect to")
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24 parser.add_argument('table',
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25 help="table to read sizes of")
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26 parser.add_argument('-o', '--output', dest='output',
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27 type=argparse.FileType('a'), default=sys.stdout,
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28 help="CSV output file; stdout by default")
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29 parser.add_argument('-w', '--wait', dest='wait',
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30 type=float, default=60.,
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31 help="how long to wait between calls in seconds [DEFAULT: %(default)s]")
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32 options = parser.parse_args(args)
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33
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34 # ensure table is part of database
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35 db = options.database
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36 tables = db.tables()
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37 if options.table not in tables:
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38 parser.error("Table '{}' not in database tables: {}".format(options.table,
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39 ', '.join(tables)))
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40
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41 # instantiate writer
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42 writer = csv.writer(options.output)
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43
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44 # get initial data
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45 previous = db.count(options.table)
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46 end = time.time()
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47 time.sleep(options.wait)
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48
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49 while True:
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50 try:
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51 start = time.time()
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52 count = db.count(options.table)
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53 rate = (count - previous)/(start-end)
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54 writer.writerow([start, count, rate])
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55 options.output.flush()
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56 end = start
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57 previous = count
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58 time.sleep(options.wait - (time.time() - start))
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59 except KeyboardInterrupt:
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60 break
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61
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62 if __name__ == '__main__':
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63 main()