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annotate scripts/dump_dbm_sessions_db.py @ 7654:1471fcda252b

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refactor: parameterize the root prefix number of characters To make i18n work on windows, we need to clean the three character root elements(drive letter, colon, backslash) from the front of the various paths. Parameterize the number of chars. Old way hard coded to 1, which leaves :/ in the path and generates bad LOCALE_DIRS. From issues getting Roundup running on windows discussed on mailing list by Simon Eigeldinger. Thread starts with: https://sourceforge.net/p/roundup/mailman/message/41557096/ subject: Installing Roundup on Windows 2023-10-05.
author John Rouillard <rouilj@ieee.org>
date Fri, 06 Oct 2023 20:45:25 -0400
parents 1188bb423f92
children 9ba04f37896f
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cd408eb748dd Add small utility script for dumping dbm based databases.
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1 #! /usr/bin/env python3
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2 """Usage: dump_dbm_sessions_db.py [filename]
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3
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4 Simple script to dump the otks and sessions dbm databases. Dumps
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5 sessions db in current directory if no argument is given.
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6
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7 Dump format:
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8
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9 key: <timestamp> data
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10
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11 where <timestamp> is the human readable __timestamp decoded from the
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12 data object. Data object is dumped in json format. With pretty print
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13
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14 key:
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15 <timestamp>
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16 {
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17 key: val,
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18 ...
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19 }
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20
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21 if data is not a python object, print will be key: data or
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22 key:
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23 data
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24
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25 if pretty printed.
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26 """
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27
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28 import argparse, dbm, json, marshal, os, sys
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29 from datetime import datetime
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30
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31 def indent(text, amount, ch=" "):
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32 """ Found at: https://stackoverflow.com/a/8348914
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33 """
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34 padding = amount * ch
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35 return ''.join(padding+line for line in text.splitlines(True))
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36
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37 def print_marshal(k):
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38 d = marshal.loads(db[k])
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39 try:
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40 t = datetime.fromtimestamp(d['__timestamp'])
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41 except (KeyError, TypeError):
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42 # TypeError raised if marshalled data is not a dict (list, tuple etc)
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43 t = "no_timestamp"
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44 if args.pretty:
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45 print("%s:\n %s\n%s"%(k, t, indent(json.dumps(
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46 d, sort_keys=True, indent=4), 4)))
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47 else:
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48 print("%s: %s %s"%(k, t, d))
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49
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50 def print_raw(k):
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51 if args.pretty:
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52 print("%s:\n %s"%(k, db[k]))
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53 else:
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54 print("%s: %s"%(k, db[k]))
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55
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56 parser = argparse.ArgumentParser(
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57 description='Dump DBM files used by Roundup in storage order.')
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58 parser.add_argument('-k', '--key', action="append",
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59 help='dump the entry for a key, can be used multiple times.')
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60 parser.add_argument('-K', '--keysonly', action='store_true',
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61 help='print the database keys, sorted in byte order.')
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62 parser.add_argument('-p', '--pretty', action='store_true',
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63 help='pretty print the output rather than printing on one line.')
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64 parser.add_argument('file', nargs='?',
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65 help='file to be dumped ("sessions" if not provided)')
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66 args = parser.parse_args()
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67
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68 if args.file:
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69 file = args.file
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70 else:
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71 file="sessions"
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72
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73 try:
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74 db = dbm.open(file)
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75 except Exception as e:
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76 print("Unable to open database for %s: %s"%(file, e))
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77 try:
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78 os.stat(file)
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79 print(" perhaps file is invalid or was created with a different version of Python?")
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80 except OSError:
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81 # the file does exist on disk.
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82 pass
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83 exit(1)
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84
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85 if args.keysonly:
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86 for k in sorted(db.keys()):
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87 print("%s"%k)
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88 exit(0)
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89
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90 if args.key:
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91 for k in args.key:
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92 try:
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93 print_marshal(k)
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94 except (ValueError):
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95 print_raw(k)
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96 exit(0)
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97
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98 k = db.firstkey()
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99 while k is not None:
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100 try:
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101 print_marshal(k)
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102 except (ValueError): # ValueError marshal.loads failed
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103 print_raw(k)
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104
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105 k = db.nextkey(k)
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