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annotate roundup/backends/sessions_dbm.py @ 4385:8d135c19523e

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fix up some pre-Python2.6 compatibility issues in the *dbm interface
author Richard Jones <richard@users.sourceforge.net>
date Sat, 10 Jul 2010 03:52:45 +0000
parents 0d9369d35483
children 6e3e4f24c753
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1 #$Id: sessions_dbm.py,v 1.10 2008-08-18 05:04:01 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 os, marshal, time
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11
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12 from roundup import hyperdb
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13 from roundup.i18n import _
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14 from roundup.anypy.dbm_ import anydbm, whichdb, key_in
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15
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16 class BasicDatabase:
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17 ''' Provide a nice encapsulation of an anydbm store.
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18
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19 Keys are id strings, values are automatically marshalled data.
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20 '''
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21 _db_type = None
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22
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23 def __init__(self, db):
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24 self.config = db.config
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25 self.dir = db.config.DATABASE
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26 os.umask(db.config.UMASK)
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27
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28 def exists(self, infoid):
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29 db = self.opendb('c')
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30 try:
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31 return key_in(db, infoid)
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32 finally:
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33 db.close()
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34
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35 def clear(self):
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36 path = os.path.join(self.dir, self.name)
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37 if os.path.exists(path):
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38 os.remove(path)
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39 elif os.path.exists(path+'.db'): # dbm appends .db
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40 os.remove(path+'.db')
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41
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42 def cache_db_type(self, path):
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43 ''' determine which DB wrote the class file, and cache it as an
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44 attribute of __class__ (to allow for subclassed DBs to be
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45 different sorts)
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46 '''
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47 db_type = ''
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48 if os.path.exists(path):
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49 db_type = whichdb(path)
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50 if not db_type:
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51 raise hyperdb.DatabaseError(
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52 _("Couldn't identify database type"))
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53 elif os.path.exists(path+'.db'):
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54 # if the path ends in '.db', it's a dbm database, whether
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55 # anydbm says it's dbhash or not!
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56 db_type = 'dbm'
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57 self.__class__._db_type = db_type
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58
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59 _marker = []
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60 def get(self, infoid, value, default=_marker):
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61 db = self.opendb('c')
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62 try:
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63 if key_in(db, infoid):
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64 values = marshal.loads(db[infoid])
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65 else:
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66 if default != self._marker:
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67 return default
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68 raise KeyError('No such %s "%s"'%(self.name, infoid))
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69 return values.get(value, None)
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70 finally:
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71 db.close()
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72
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73 def getall(self, infoid):
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74 db = self.opendb('c')
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75 try:
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76 try:
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77 d = marshal.loads(db[infoid])
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78 del d['__timestamp']
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79 return d
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80 except KeyError:
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81 raise KeyError('No such %s "%s"'%(self.name, infoid))
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82 finally:
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83 db.close()
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84
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85 def set(self, infoid, **newvalues):
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86 db = self.opendb('c')
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87 try:
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88 if key_in(db, infoid):
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89 values = marshal.loads(db[infoid])
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90 else:
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91 values = {'__timestamp': time.time()}
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92 values.update(newvalues)
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93 db[infoid] = marshal.dumps(values)
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94 finally:
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95 db.close()
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96
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97 def list(self):
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98 db = self.opendb('r')
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99 try:
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100 return list(db.keys())
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101 finally:
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102 db.close()
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103
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104 def destroy(self, infoid):
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105 db = self.opendb('c')
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106 try:
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107 if key_in(db, infoid):
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108 del db[infoid]
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109 finally:
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110 db.close()
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111
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112 def opendb(self, mode):
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113 '''Low-level database opener that gets around anydbm/dbm
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114 eccentricities.
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115 '''
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116 # figure the class db type
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117 path = os.path.join(os.getcwd(), self.dir, self.name)
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118 if self._db_type is None:
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119 self.cache_db_type(path)
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120
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121 db_type = self._db_type
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122
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123 # new database? let anydbm pick the best dbm
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124 if not db_type:
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125 return anydbm.open(path, 'c')
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126
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127 # open the database with the correct module
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128 dbm = __import__(db_type)
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129 return dbm.open(path, mode)
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130
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131 def commit(self):
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132 pass
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133
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134 def close(self):
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135 pass
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136
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137 def updateTimestamp(self, sessid):
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138 ''' don't update every hit - once a minute should be OK '''
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139 sess = self.get(sessid, '__timestamp', None)
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140 now = time.time()
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141 if sess is None or now > sess + 60:
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142 self.set(sessid, __timestamp=now)
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143
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144 def clean(self):
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145 ''' Remove session records that haven't been used for a week. '''
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146 now = time.time()
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147 week = 60*60*24*7
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148 for sessid in self.list():
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149 sess = self.get(sessid, '__timestamp', None)
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150 if sess is None:
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151 self.updateTimestamp(sessid)
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152 continue
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153 interval = now - sess
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154 if interval > week:
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155 self.destroy(sessid)
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156
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157 class Sessions(BasicDatabase):
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158 name = 'sessions'
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159
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160 class OneTimeKeys(BasicDatabase):
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161 name = 'otks'
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162
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163 # vim: set sts ts=4 sw=4 et si :
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