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annotate roundup/backends/sessions_dbm.py @ 5746:fea2b6e54492

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author John Rouillard <rouilj@ieee.org>
date Wed, 29 May 2019 22:56:50 -0400
parents 0e6ed3d72f92
children abee2c2c822e
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c091cacdc505 Finished implementation of session and one-time-key stores for RDBMS backends.
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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 name = None
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24
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25 def __init__(self, db):
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26 self.config = db.config
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27 self.dir = db.config.DATABASE
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28 os.umask(db.config.UMASK)
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29
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30 def exists(self, infoid):
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31 db = self.opendb('c')
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32 try:
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33 return infoid in db
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34 finally:
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35 db.close()
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36
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37 def clear(self):
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38 path = os.path.join(self.dir, self.name)
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39 if os.path.exists(path):
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40 os.remove(path)
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41 elif os.path.exists(path+'.db'): # dbm appends .db
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42 os.remove(path+'.db')
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43
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44 def cache_db_type(self, path):
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45 ''' determine which DB wrote the class file, and cache it as an
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46 attribute of __class__ (to allow for subclassed DBs to be
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47 different sorts)
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48 '''
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49 db_type = ''
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50 if os.path.exists(path):
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51 db_type = whichdb(path)
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52 if not db_type:
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53 raise hyperdb.DatabaseError(
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54 _("Couldn't identify database type"))
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55 elif os.path.exists(path+'.db'):
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56 # if the path ends in '.db', it's a dbm database, whether
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57 # anydbm says it's dbhash or not!
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58 db_type = 'dbm'
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59 self.__class__._db_type = db_type
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60
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61 _marker = []
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62
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63 def get(self, infoid, value, default=_marker):
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64 db = self.opendb('c')
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65 try:
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66 if infoid in db:
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67 values = marshal.loads(db[infoid])
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68 else:
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69 if default != self._marker:
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70 return default
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71 raise KeyError('No such %s "%s"'%(self.name, escape(infoid)))
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72 return values.get(value, None)
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73 finally:
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74 db.close()
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75
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76 def getall(self, infoid):
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77 db = self.opendb('c')
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78 try:
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79 try:
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80 d = marshal.loads(db[infoid])
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81 del d['__timestamp']
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82 return d
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83 except KeyError:
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84 raise KeyError('No such %s "%s"'%(self.name, escape(infoid)))
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85 finally:
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86 db.close()
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87
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88 def set(self, infoid, **newvalues):
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89 db = self.opendb('c')
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90 try:
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91 if infoid in db:
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92 values = marshal.loads(db[infoid])
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93 else:
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94 values = {'__timestamp': time.time()}
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95 values.update(newvalues)
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96 db[infoid] = marshal.dumps(values)
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97 finally:
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98 db.close()
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99
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100 def list(self):
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101 db = self.opendb('r')
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102 try:
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103 return list(db.keys())
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104 finally:
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105 db.close()
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106
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107 def destroy(self, infoid):
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108 db = self.opendb('c')
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109 try:
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110 if infoid in db:
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111 del db[infoid]
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112 finally:
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113 db.close()
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114
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115 def opendb(self, mode):
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116 '''Low-level database opener that gets around anydbm/dbm
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117 eccentricities.
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118 '''
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119 # figure the class db type
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120 path = os.path.join(os.getcwd(), self.dir, self.name)
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121 if self._db_type is None:
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122 self.cache_db_type(path)
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123
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124 db_type = self._db_type
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125
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126 # new database? let anydbm pick the best dbm
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127 if not db_type:
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128 return anydbm.open(path, 'c')
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129
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130 # open the database with the correct module
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131 dbm = __import__(db_type)
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132
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133 retries_left=15
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134 while True:
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135 try:
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136 handle = dbm.open(path, mode)
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137 break
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138 except OSError as e:
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139 # Primarily we want to catch and retry:
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140 # [Errno 11] Resource temporarily unavailable retry
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141 # FIXME: make this more specific
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142 if retries_left < 0:
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143 # We have used up the retries. Reraise the exception
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144 # that got us here.
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145 raise
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146 else:
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147 # delay retry a bit
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148 time.sleep(0.01)
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149 retries_left = retries_left -1
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150 continue # the while loop
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151 return handle
2082
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152
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153 def commit(self):
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154 pass
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155
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156 def close(self):
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157 pass
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158
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159 def updateTimestamp(self, sessid):
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160 ''' don't update every hit - once a minute should be OK '''
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161 sess = self.get(sessid, '__timestamp', None)
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162 now = time.time()
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163 if sess is None or now > sess + 60:
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164 self.set(sessid, __timestamp=now)
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165
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166 def clean(self):
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167 ''' Remove session records that haven't been used for a week. '''
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168 now = time.time()
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169 week = 60*60*24*7
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170 for sessid in self.list():
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171 sess = self.get(sessid, '__timestamp', None)
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172 if sess is None:
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173 self.updateTimestamp(sessid)
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174 continue
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175 interval = now - sess
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176 if interval > week:
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177 self.destroy(sessid)
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178
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179 class Sessions(BasicDatabase):
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180 name = 'sessions'
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181
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182 class OneTimeKeys(BasicDatabase):
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183 name = 'otks'
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184
3925
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185 # vim: set sts ts=4 sw=4 et si :
Roundup Issue Tracker: http://roundup-tracker.org/