Mercurial > p > roundup > code

annotate roundup/backends/sessions_rdbms.py @ 8264:09e8d1a4c796

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docs: clarify wording, fix index, add superseder link Make superseder, messages etc. properties index entries point to the right place. Link to description of using Superseder in the original overview. fix bad wording on boolean properties.
author John Rouillard <rouilj@ieee.org>
date Wed, 08 Jan 2025 11:39:54 -0500
parents fe0091279f50
children ee17f62c8341
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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 import time
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9
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10 from roundup.anypy.html import html_escape as escape
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11 from roundup.backends.sessions_common import SessionCommon
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12
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13
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14 class BasicDatabase(SessionCommon):
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15 ''' Provide a nice encapsulation of an RDBMS table.
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16
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17 Keys are id strings, values are automatically marshalled data.
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18 '''
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19 name = None
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20
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21 def __init__(self, db):
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22 self.db = db
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23 self.conn, self.cursor = self.db.sql_open_connection()
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24
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25 def clear(self):
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26 self.cursor.execute('delete from %ss' % self.name)
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27
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28 def exists(self, infoid):
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29 n = self.name
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30 self.cursor.execute('select count(*) from %ss where %s_key=%s' %
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31 (n, n, self.db.arg), (infoid,))
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32 return int(self.cursor.fetchone()[0])
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33
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34 _marker = []
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35
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36 def get(self, infoid, value, default=_marker):
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37 n = self.name
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38 self.cursor.execute('select %s_value from %ss where %s_key=%s' %
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39 (n, n, n, self.db.arg), (infoid,))
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40 res = self.cursor.fetchone()
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41 if not res:
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42 if default != self._marker:
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43 return default
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44 raise KeyError('No such %s "%s"' % (self.name, escape(infoid)))
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45 values = eval(res[0])
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46 return values.get(value, None)
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47
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48 def getall(self, infoid):
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49 n = self.name
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50 self.cursor.execute('select %s_value from %ss where %s_key=%s' %
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51 (n, n, n, self.db.arg), (infoid,))
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52 res = self.cursor.fetchone()
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53 if not res:
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54 raise KeyError('No such %s "%s"' % (self.name, escape(infoid)))
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55 return eval(res[0])
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56
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57 def set(self, infoid, **newvalues):
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58 """ Store all newvalues under key infoid with a timestamp in database.
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59
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60 If newvalues['__timestamp'] exists and is representable as
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61 a floating point number (i.e. could be generated by time.time()),
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62 that value is used for the <name>_time column in the database.
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63 """
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64 c = self.cursor
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65 n = self.name
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66 a = self.db.arg
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67 c.execute('select %s_value from %ss where %s_key=%s' %
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68 (n, n, n, a), (infoid,))
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69 res = c.fetchone()
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70
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71 timestamp = time.time()
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72 if res:
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73 values = eval(res[0])
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74 else:
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75 values = {}
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76
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77 if '__timestamp' in newvalues:
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78 try:
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79 # __timestamp must be representable as a float. Check it.
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80 timestamp = float(newvalues['__timestamp'])
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81 except ValueError:
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82 if res:
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83 # keep the original timestamp
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84 del(newvalues['__timestamp'])
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85 else:
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86 # here timestamp is the new timestamp
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87 newvalues['__timestamp'] = timestamp
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88 values.update(newvalues)
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89 if res:
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90 sql = ('update %ss set %s_value=%s, %s_time=%s '
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91 'where %s_key=%s' % (n, n, a, n, a, n, a))
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92 args = (repr(values), timestamp, infoid)
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93 else:
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94 sql = 'insert into %ss (%s_key, %s_time, %s_value) '\
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95 'values (%s, %s, %s)' % (n, n, n, n, a, a, a)
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96 args = (infoid, timestamp, repr(values))
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97 c.execute(sql, args)
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98
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99 def list(self):
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100 c = self.cursor
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101 n = self.name
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102 c.execute('select %s_key from %ss' % (n, n))
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103 return [res[0] for res in c.fetchall()]
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104
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105 def destroy(self, infoid):
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106 self.cursor.execute('delete from %ss where %s_key=%s' %
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107 (self.name, self.name, self.db.arg), (infoid,))
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108
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109 def updateTimestamp(self, infoid):
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110 """ don't update every hit - once a minute should be OK """
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111 now = time.time()
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112 self.cursor.execute('''update %ss set %s_time=%s where %s_key=%s '''
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113 '''and %s_time < %s''' %
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114 (self.name, self.name, self.db.arg, self.name,
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115 self.db.arg, self.name, self.db.arg),
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116 (now, infoid, now-60))
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117
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118 def clean(self):
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119 ''' Remove session records that haven't been used for a week. '''
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120 now = time.time()
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121 week = 60*60*24*7
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122 old = now - week
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123 self.cursor.execute('delete from %ss where %s_time < %s' %
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124 (self.name, self.name, self.db.arg), (old, ))
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125
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126 def commit(self):
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127 self.log_info('commit %s' % self.name)
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128 self.conn.commit()
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129 self.cursor = self.conn.cursor()
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130
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131 def lifetime(self, item_lifetime=0):
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132 """Return the proper timestamp for a key with key_lifetime specified
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133 in seconds. Default lifetime is 0.
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134 """
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135 now = time.time()
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136 week = 60*60*24*7
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137 return now - week + item_lifetime
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138
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139 def close(self):
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140 self.conn.close()
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141
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142
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143 class Sessions(BasicDatabase):
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144 name = 'session'
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145
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146
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147 class OneTimeKeys(BasicDatabase):
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148 name = 'otk'
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149
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150 # vim: set et sts=4 sw=4 :
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