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annotate roundup/backends/sessions_dbm.py @ 2082:c091cacdc505

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Finished implementation of session and one-time-key stores for RDBMS backends. Refactored the API of sessions and their interaction with the backend database a fair bit too. Added some session tests. Nothing testing ageing yet, 'cos that's a pain inna ass to test :) Note: metakit backend still uses the *dbm implementation. It might want to implement its own session store some day, as it'll be faster than the *dbm one.
author Richard Jones <richard@users.sourceforge.net>
date Thu, 18 Mar 2004 01:58:46 +0000
parents
children 93f03c6714d8
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rev   line source
2082
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
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1 #$Id: sessions_dbm.py,v 1.1 2004-03-18 01:58:45 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 return marshal.loads(db[infoid])
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67 except KeyError:
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68 raise KeyError, 'No such %s "%s"'%(self.name, infoid)
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69 finally:
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70 db.close()
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71
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72 def set(self, infoid, **newvalues):
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73 db = self.opendb('c')
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74 try:
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75 if db.has_key(infoid):
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76 values = marshal.loads(db[infoid])
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77 else:
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78 values = {'__timestamp': time.time()}
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79 values.update(newvalues)
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80 db[infoid] = marshal.dumps(values)
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81 finally:
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82 db.close()
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83
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84 def list(self):
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85 db = self.opendb('r')
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86 try:
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87 return db.keys()
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88 finally:
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89 db.close()
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90
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91 def destroy(self, infoid):
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92 db = self.opendb('c')
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93 try:
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94 if db.has_key(infoid):
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95 del db[infoid]
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96 finally:
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97 db.close()
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98
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99 def opendb(self, mode):
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100 '''Low-level database opener that gets around anydbm/dbm
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101 eccentricities.
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102 '''
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103 # figure the class db type
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104 path = os.path.join(os.getcwd(), self.dir, self.name)
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105 if self._db_type is None:
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106 self.cache_db_type(path)
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107
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108 db_type = self._db_type
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109
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110 # new database? let anydbm pick the best dbm
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111 if not db_type:
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112 return anydbm.open(path, 'c')
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113
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114 # open the database with the correct module
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115 dbm = __import__(db_type)
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116 return dbm.open(path, mode)
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117
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118 def commit(self):
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119 pass
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120
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121 def close(self):
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122 pass
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123
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124 def updateTimestamp(self, sessid):
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125 self.set(sessid, __timestamp=time.time())
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126
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127 def clean(self, now):
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128 """Age sessions, remove when they haven't been used for a week.
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129 """
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130 week = 60*60*24*7
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
131 for sessid in self.list():
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
Richard Jones <richard@users.sourceforge.net>
parents:
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132 interval = now - self.get(sessid, '__timestamp')
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
133 if interval > week:
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
134 self.destroy(sessid)
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
135
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
Richard Jones <richard@users.sourceforge.net>
parents:
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136 class Sessions(BasicDatabase):
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
137 name = 'sessions'
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
138
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 class OneTimeKeys(BasicDatabase):
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
Richard Jones <richard@users.sourceforge.net>
parents:
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140 name = 'otks'
c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
141
Roundup Issue Tracker: http://roundup-tracker.org/