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annotate roundup/backends/sessions_dbm.py @ 2151:ae21c1fc41d5

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better fix
author Richard Jones <richard@users.sourceforge.net>
date Fri, 26 Mar 2004 23:56:11 +0000
parents c69dd43728a3
children 12cd4fa91eb7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2151
ae21c1fc41d5 better fix
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1 #$Id: sessions_dbm.py,v 1.4 2004-03-26 23:56:11 richard 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
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12 class BasicDatabase:
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13 ''' Provide a nice encapsulation of an anydbm store.
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14
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15 Keys are id strings, values are automatically marshalled data.
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16 '''
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17 _db_type = None
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18
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19 def __init__(self, db):
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20 self.config = db.config
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21 self.dir = db.config.DATABASE
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22 # ensure files are group readable and writable
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23 os.umask(0002)
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24
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25 def clear(self):
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26 path = os.path.join(self.dir, self.name)
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27 if os.path.exists(path):
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28 os.remove(path)
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29 elif os.path.exists(path+'.db'): # dbm appends .db
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30 os.remove(path+'.db')
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31
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32 def cache_db_type(self, path):
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33 ''' determine which DB wrote the class file, and cache it as an
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34 attribute of __class__ (to allow for subclassed DBs to be
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35 different sorts)
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36 '''
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37 db_type = ''
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38 if os.path.exists(path):
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39 db_type = whichdb.whichdb(path)
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40 if not db_type:
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41 raise hyperdb.DatabaseError, "Couldn't identify database type"
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42 elif os.path.exists(path+'.db'):
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43 # if the path ends in '.db', it's a dbm database, whether
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44 # anydbm says it's dbhash or not!
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45 db_type = 'dbm'
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46 self.__class__._db_type = db_type
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47
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48 _marker = []
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49 def get(self, infoid, value, default=_marker):
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50 db = self.opendb('c')
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51 try:
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52 if db.has_key(infoid):
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53 values = marshal.loads(db[infoid])
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54 else:
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55 if default != self._marker:
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56 return default
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57 raise KeyError, 'No such %s "%s"'%(self.name, infoid)
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58 return values.get(value, None)
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59 finally:
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60 db.close()
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61
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62 def getall(self, infoid):
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63 db = self.opendb('c')
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64 try:
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65 try:
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66 d = marshal.loads(db[infoid])
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67 del d['__timestamp']
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68 return d
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69 except KeyError:
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70 raise KeyError, 'No such %s "%s"'%(self.name, infoid)
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71 finally:
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72 db.close()
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73
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74 def set(self, infoid, **newvalues):
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75 db = self.opendb('c')
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76 try:
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77 if db.has_key(infoid):
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78 values = marshal.loads(db[infoid])
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79 else:
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80 values = {'__timestamp': time.time()}
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81 values.update(newvalues)
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82 db[infoid] = marshal.dumps(values)
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83 finally:
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84 db.close()
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85
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86 def list(self):
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87 db = self.opendb('r')
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88 try:
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89 return db.keys()
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90 finally:
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91 db.close()
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92
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93 def destroy(self, infoid):
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94 db = self.opendb('c')
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95 try:
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96 if db.has_key(infoid):
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97 del db[infoid]
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98 finally:
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99 db.close()
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100
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101 def opendb(self, mode):
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102 '''Low-level database opener that gets around anydbm/dbm
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103 eccentricities.
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104 '''
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105 # figure the class db type
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106 path = os.path.join(os.getcwd(), self.dir, self.name)
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107 if self._db_type is None:
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108 self.cache_db_type(path)
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109
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110 db_type = self._db_type
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111
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112 # new database? let anydbm pick the best dbm
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113 if not db_type:
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114 return anydbm.open(path, 'c')
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115
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116 # open the database with the correct module
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117 dbm = __import__(db_type)
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118 return dbm.open(path, mode)
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119
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120 def commit(self):
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121 pass
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122
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123 def close(self):
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124 pass
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125
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126 def updateTimestamp(self, sessid):
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127 self.set(sessid, __timestamp=time.time())
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128
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129 def clean(self, now):
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130 """Age sessions, remove when they haven't been used for a week.
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131 """
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132 week = 60*60*24*7
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
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133 for sessid in self.list():
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ae21c1fc41d5 better fix
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134 sess = self.get(sessid, '__timestamp', None)
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135 if sess is None:
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136 sess=time.time()
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137 self.updateTimestamp(sessid)
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138 interval = now - sess
2082
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
Richard Jones <richard@users.sourceforge.net>
parents:
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139 if interval > week:
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
Richard Jones <richard@users.sourceforge.net>
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140 self.destroy(sessid)
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
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141
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
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142 class Sessions(BasicDatabase):
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
Richard Jones <richard@users.sourceforge.net>
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143 name = 'sessions'
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
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144
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
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145 class OneTimeKeys(BasicDatabase):
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
Richard Jones <richard@users.sourceforge.net>
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146 name = 'otks'
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
Richard Jones <richard@users.sourceforge.net>
parents:
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147
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