Mercurial > p > roundup > code

annotate roundup/backends/sessions_dbm.py @ 5732:0e6ed3d72f92

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Rest rate limiting code first commit. It is a bit rough and turned off by default. The current code is lossy. If client connections are fast enough, the rate limiting code doesn't count every connection. So the client can get more connections than configured if they are fast enough. 5-20% of the connections are not recorded.
author John Rouillard <rouilj@ieee.org>
date Sat, 25 May 2019 16:50:25 -0400
parents 0b154486ed38
children abee2c2c822e
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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
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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
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185 # vim: set sts ts=4 sw=4 et si :
Roundup Issue Tracker: http://roundup-tracker.org/