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annotate roundup/backends/sessions_dbm.py @ 5011:d5da643b3d25

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Remove key_in() from roundup.anypy.dbm_ The key_in() function was just a shim to use the best available option out of 'd.has_key(key)' and 'key in d'. The 'd.has_key(key)' flavour has been deprecated in favour of 'key in d' which based on testing has been available since at least python v2.5 which is the oldest being supported.
author John Kristensen <john@jerrykan.com>
date Fri, 13 Feb 2015 00:20:43 +1100
parents 033a550812fc
children 0b154486ed38
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1 """This module defines a very basic store that's used by the CGI interface
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2 to store session and one-time-key information.
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3
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4 Yes, it's called "sessions" - because originally it only defined a session
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5 class. It's now also used for One Time Key handling too.
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6 """
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7 __docformat__ = 'restructuredtext'
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8
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9 import os, marshal, time
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10
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11 from cgi import escape
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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
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16
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17 class BasicDatabase:
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18 ''' Provide a nice encapsulation of an anydbm store.
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19
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20 Keys are id strings, values are automatically marshalled data.
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21 '''
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22 _db_type = None
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23
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24 def __init__(self, db):
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25 self.config = db.config
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26 self.dir = db.config.DATABASE
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27 os.umask(db.config.UMASK)
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28
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29 def exists(self, infoid):
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30 db = self.opendb('c')
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31 try:
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32 return infoid in db
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33 finally:
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34 db.close()
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35
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36 def clear(self):
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37 path = os.path.join(self.dir, self.name)
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38 if os.path.exists(path):
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39 os.remove(path)
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40 elif os.path.exists(path+'.db'): # dbm appends .db
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41 os.remove(path+'.db')
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42
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43 def cache_db_type(self, path):
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44 ''' determine which DB wrote the class file, and cache it as an
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45 attribute of __class__ (to allow for subclassed DBs to be
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46 different sorts)
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47 '''
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48 db_type = ''
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49 if os.path.exists(path):
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50 db_type = whichdb(path)
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51 if not db_type:
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52 raise hyperdb.DatabaseError(
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53 _("Couldn't identify database type"))
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54 elif os.path.exists(path+'.db'):
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55 # if the path ends in '.db', it's a dbm database, whether
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56 # anydbm says it's dbhash or not!
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57 db_type = 'dbm'
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58 self.__class__._db_type = db_type
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59
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60 _marker = []
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61
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62 def get(self, infoid, value, default=_marker):
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63 db = self.opendb('c')
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64 try:
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65 if infoid in db:
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66 values = marshal.loads(db[infoid])
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67 else:
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68 if default != self._marker:
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69 return default
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70 raise KeyError('No such %s "%s"'%(self.name, escape(infoid)))
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71 return values.get(value, None)
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72 finally:
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73 db.close()
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74
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75 def getall(self, infoid):
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76 db = self.opendb('c')
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77 try:
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78 try:
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79 d = marshal.loads(db[infoid])
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80 del d['__timestamp']
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81 return d
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82 except KeyError:
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83 raise KeyError('No such %s "%s"'%(self.name, escape(infoid)))
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84 finally:
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85 db.close()
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86
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87 def set(self, infoid, **newvalues):
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88 db = self.opendb('c')
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89 try:
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90 if infoid in db:
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91 values = marshal.loads(db[infoid])
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92 else:
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93 values = {'__timestamp': time.time()}
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94 values.update(newvalues)
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95 db[infoid] = marshal.dumps(values)
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96 finally:
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97 db.close()
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98
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99 def list(self):
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100 db = self.opendb('r')
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101 try:
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102 return list(db.keys())
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103 finally:
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104 db.close()
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105
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106 def destroy(self, infoid):
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107 db = self.opendb('c')
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108 try:
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109 if infoid in db:
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110 del db[infoid]
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111 finally:
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112 db.close()
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113
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114 def opendb(self, mode):
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115 '''Low-level database opener that gets around anydbm/dbm
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116 eccentricities.
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117 '''
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118 # figure the class db type
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119 path = os.path.join(os.getcwd(), self.dir, self.name)
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120 if self._db_type is None:
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121 self.cache_db_type(path)
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122
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123 db_type = self._db_type
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124
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125 # new database? let anydbm pick the best dbm
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126 if not db_type:
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127 return anydbm.open(path, 'c')
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128
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129 # open the database with the correct module
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130 dbm = __import__(db_type)
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131 return dbm.open(path, mode)
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132
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133 def commit(self):
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134 pass
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135
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136 def close(self):
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137 pass
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138
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139 def updateTimestamp(self, sessid):
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140 ''' don't update every hit - once a minute should be OK '''
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141 sess = self.get(sessid, '__timestamp', None)
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142 now = time.time()
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143 if sess is None or now > sess + 60:
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144 self.set(sessid, __timestamp=now)
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145
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146 def clean(self):
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147 ''' Remove session records that haven't been used for a week. '''
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148 now = time.time()
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149 week = 60*60*24*7
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150 for sessid in self.list():
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151 sess = self.get(sessid, '__timestamp', None)
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152 if sess is None:
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153 self.updateTimestamp(sessid)
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154 continue
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155 interval = now - sess
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156 if interval > week:
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157 self.destroy(sessid)
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158
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159 class Sessions(BasicDatabase):
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160 name = 'sessions'
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161
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162 class OneTimeKeys(BasicDatabase):
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163 name = 'otks'
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164
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165 # vim: set sts ts=4 sw=4 et si :
Roundup Issue Tracker: http://roundup-tracker.org/