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annotate roundup/backends/sessions_dbm.py @ 3924:21d3d7eeea8c

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assorted pyflakes fixes I (re-)discovered pyflakes today and ran it over to roundup code to see what it had to say. It reported a ton of "imported module foo but you're not actually using it" warnings and a couple of actual errors that this patch fixes. The code was wrong but it was mostly stuff that never gets executed...like hyperdb.Choice.
author Justus Pendleton <jpend@users.sourceforge.net>
date Thu, 27 Sep 2007 06:12:57 +0000
parents f2fda3e6fc8b
children 603ec9630b08
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #$Id: sessions_dbm.py,v 1.8 2007-09-27 06:12:57 jpend Exp $
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2 """This module defines a very basic store that's used by the CGI interface
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3 to store session and one-time-key information.
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4
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5 Yes, it's called "sessions" - because originally it only defined a session
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6 class. It's now also used for One Time Key handling too.
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7 """
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8 __docformat__ = 'restructuredtext'
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9
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10 import anydbm, whichdb, os, marshal, time
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11 from roundup import hyperdb
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12
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13 class BasicDatabase:
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14 ''' Provide a nice encapsulation of an anydbm store.
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15
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16 Keys are id strings, values are automatically marshalled data.
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17 '''
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18 _db_type = None
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19
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20 def __init__(self, db):
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21 self.config = db.config
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22 self.dir = db.config.DATABASE
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23 os.umask(db.config.UMASK)
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24
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25 def exists(self, infoid):
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26 db = self.opendb('c')
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27 try:
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28 return db.has_key(infoid)
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29 finally:
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30 db.close()
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31
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32 def clear(self):
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33 path = os.path.join(self.dir, self.name)
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34 if os.path.exists(path):
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35 os.remove(path)
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36 elif os.path.exists(path+'.db'): # dbm appends .db
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37 os.remove(path+'.db')
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38
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39 def cache_db_type(self, path):
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40 ''' determine which DB wrote the class file, and cache it as an
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41 attribute of __class__ (to allow for subclassed DBs to be
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42 different sorts)
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43 '''
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44 db_type = ''
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45 if os.path.exists(path):
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46 db_type = whichdb.whichdb(path)
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47 if not db_type:
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48 raise hyperdb.DatabaseError, "Couldn't identify database type"
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49 elif os.path.exists(path+'.db'):
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50 # if the path ends in '.db', it's a dbm database, whether
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51 # anydbm says it's dbhash or not!
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52 db_type = 'dbm'
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53 self.__class__._db_type = db_type
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54
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55 _marker = []
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56 def get(self, infoid, value, default=_marker):
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57 db = self.opendb('c')
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58 try:
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59 if db.has_key(infoid):
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60 values = marshal.loads(db[infoid])
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61 else:
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62 if default != self._marker:
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63 return default
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64 raise KeyError, 'No such %s "%s"'%(self.name, infoid)
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65 return values.get(value, None)
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66 finally:
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67 db.close()
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68
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69 def getall(self, infoid):
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70 db = self.opendb('c')
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71 try:
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72 try:
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73 d = marshal.loads(db[infoid])
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74 del d['__timestamp']
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75 return d
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76 except KeyError:
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77 raise KeyError, 'No such %s "%s"'%(self.name, infoid)
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78 finally:
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79 db.close()
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80
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81 def set(self, infoid, **newvalues):
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82 db = self.opendb('c')
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83 try:
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84 if db.has_key(infoid):
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85 values = marshal.loads(db[infoid])
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86 else:
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87 values = {'__timestamp': time.time()}
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88 values.update(newvalues)
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89 db[infoid] = marshal.dumps(values)
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90 finally:
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91 db.close()
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92
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93 def list(self):
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94 db = self.opendb('r')
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95 try:
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96 return db.keys()
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97 finally:
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98 db.close()
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99
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100 def destroy(self, infoid):
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101 db = self.opendb('c')
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102 try:
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103 if db.has_key(infoid):
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104 del db[infoid]
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105 finally:
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106 db.close()
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107
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108 def opendb(self, mode):
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109 '''Low-level database opener that gets around anydbm/dbm
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110 eccentricities.
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111 '''
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112 # figure the class db type
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113 path = os.path.join(os.getcwd(), self.dir, self.name)
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114 if self._db_type is None:
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115 self.cache_db_type(path)
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116
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117 db_type = self._db_type
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118
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119 # new database? let anydbm pick the best dbm
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120 if not db_type:
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121 return anydbm.open(path, 'c')
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122
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123 # open the database with the correct module
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124 dbm = __import__(db_type)
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125 return dbm.open(path, mode)
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126
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127 def commit(self):
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128 pass
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129
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130 def close(self):
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131 pass
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132
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133 def updateTimestamp(self, sessid):
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134 ''' don't update every hit - once a minute should be OK '''
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135 sess = self.get(sessid, '__timestamp', None)
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136 now = time.time()
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137 if sess is None or now > sess + 60:
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138 self.set(sessid, __timestamp=now)
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139
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140 def clean(self, now):
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141 """Age sessions, remove when they haven't been used for a week.
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142 """
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143 week = 60*60*24*7
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144 for sessid in self.list():
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145 sess = self.get(sessid, '__timestamp', None)
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146 if sess is None:
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147 sess=time.time()
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148 self.updateTimestamp(sessid)
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149 interval = now - sess
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150 if interval > week:
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151 self.destroy(sessid)
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152
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153 class Sessions(BasicDatabase):
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154 name = 'sessions'
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155
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156 class OneTimeKeys(BasicDatabase):
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157 name = 'otks'
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158
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