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annotate roundup/backends/back_anydbm.py @ 440:de5bf4191f11

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Enabled transaction support in the bsddb backend. It uses the anydbm code where possible, only replacing methods where the db is opened (it uses the btree opener specifically.) Also cleaned up some change note generation. Made the backends package work with pydoc too.
author Richard Jones <richard@users.sourceforge.net>
date Mon, 10 Dec 2001 22:20:01 +0000
parents a28a80b714f9
children a0c598702f17
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1 #
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2 # Copyright (c) 2001 Bizar Software Pty Ltd (http://www.bizarsoftware.com.au/)
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3 # This module is free software, and you may redistribute it and/or modify
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4 # under the same terms as Python, so long as this copyright message and
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5 # disclaimer are retained in their original form.
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6 #
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7 # IN NO EVENT SHALL BIZAR SOFTWARE PTY LTD BE LIABLE TO ANY PARTY FOR
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8 # DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING
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9 # OUT OF THE USE OF THIS CODE, EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE
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10 # POSSIBILITY OF SUCH DAMAGE.
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11 #
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12 # BIZAR SOFTWARE PTY LTD SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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13 # BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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14 # FOR A PARTICULAR PURPOSE. THE CODE PROVIDED HEREUNDER IS ON AN "AS IS"
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15 # BASIS, AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,
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16 # SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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17 #
440
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18 #$Id: back_anydbm.py,v 1.14 2001-12-10 22:20:01 richard Exp $
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19 '''
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20 This module defines a backend that saves the hyperdatabase in a database
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21 chosen by anydbm. It is guaranteed to always be available in python
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22 versions >2.1.1 (the dumbdbm fallback in 2.1.1 and earlier has several
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23 serious bugs, and is not available)
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24 '''
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25
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26 import anydbm, os, marshal
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27 from roundup import hyperdb, date, password
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29 #
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30 # Now the database
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31 #
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32 class Database(hyperdb.Database):
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33 """A database for storing records containing flexible data types.
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34
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35 Transaction stuff TODO:
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36 . check the timestamp of the class file and nuke the cache if it's
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37 modified. Do some sort of conflict checking on the dirty stuff.
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38 . perhaps detect write collisions (related to above)?
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39
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40 """
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41 def __init__(self, storagelocator, journaltag=None):
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42 """Open a hyperdatabase given a specifier to some storage.
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43
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44 The meaning of 'storagelocator' depends on the particular
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45 implementation of the hyperdatabase. It could be a file name,
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46 a directory path, a socket descriptor for a connection to a
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47 database over the network, etc.
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48
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49 The 'journaltag' is a token that will be attached to the journal
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50 entries for any edits done on the database. If 'journaltag' is
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51 None, the database is opened in read-only mode: the Class.create(),
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52 Class.set(), and Class.retire() methods are disabled.
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53 """
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54 self.dir, self.journaltag = storagelocator, journaltag
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55 self.classes = {}
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56 self.cache = {} # cache of nodes loaded or created
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57 self.dirtynodes = {} # keep track of the dirty nodes by class
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58 self.newnodes = {} # keep track of the new nodes by class
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59 self.transactions = []
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61 #
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62 # Classes
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63 #
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64 def __getattr__(self, classname):
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65 """A convenient way of calling self.getclass(classname)."""
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66 return self.classes[classname]
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67
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68 def addclass(self, cl):
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69 cn = cl.classname
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70 if self.classes.has_key(cn):
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71 raise ValueError, cn
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72 self.classes[cn] = cl
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73
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74 def getclasses(self):
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75 """Return a list of the names of all existing classes."""
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76 l = self.classes.keys()
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77 l.sort()
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78 return l
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79
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80 def getclass(self, classname):
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81 """Get the Class object representing a particular class.
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82
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83 If 'classname' is not a valid class name, a KeyError is raised.
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84 """
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85 return self.classes[classname]
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86
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87 #
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88 # Class DBs
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89 #
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90 def clear(self):
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91 for cn in self.classes.keys():
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92 db = os.path.join(self.dir, 'nodes.%s'%cn)
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93 anydbm.open(db, 'n')
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94 db = os.path.join(self.dir, 'journals.%s'%cn)
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95 anydbm.open(db, 'n')
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96
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97 def getclassdb(self, classname, mode='r'):
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98 ''' grab a connection to the class db that will be used for
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99 multiple actions
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100 '''
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101 path = os.path.join(os.getcwd(), self.dir, 'nodes.%s'%classname)
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102 if os.path.exists(path):
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103 return anydbm.open(path, mode)
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104 else:
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105 return anydbm.open(path, 'n')
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106
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107 #
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108 # Nodes
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109 #
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110 def addnode(self, classname, nodeid, node):
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111 ''' add the specified node to its class's db
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112 '''
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113 self.newnodes.setdefault(classname, {})[nodeid] = 1
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114 self.cache.setdefault(classname, {})[nodeid] = node
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115 self.savenode(classname, nodeid, node)
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116
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117 def setnode(self, classname, nodeid, node):
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118 ''' change the specified node
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119 '''
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120 self.dirtynodes.setdefault(classname, {})[nodeid] = 1
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121 # can't set without having already loaded the node
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122 self.cache[classname][nodeid] = node
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123 self.savenode(classname, nodeid, node)
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124
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125 def savenode(self, classname, nodeid, node):
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126 ''' perform the saving of data specified by the set/addnode
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127 '''
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128 self.transactions.append((self._doSaveNode, (classname, nodeid, node)))
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129
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130 def getnode(self, classname, nodeid, cldb=None):
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131 ''' add the specified node to its class's db
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132 '''
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133 # try the cache
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134 cache = self.cache.setdefault(classname, {})
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135 if cache.has_key(nodeid):
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136 return cache[nodeid]
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137
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138 # get from the database and save in the cache
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139 db = cldb or self.getclassdb(classname)
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140 if not db.has_key(nodeid):
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141 raise IndexError, nodeid
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142 res = marshal.loads(db[nodeid])
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143 cache[nodeid] = res
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144 return res
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145
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146 def hasnode(self, classname, nodeid, cldb=None):
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147 ''' add the specified node to its class's db
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148 '''
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149 # try the cache
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150 cache = self.cache.setdefault(classname, {})
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151 if cache.has_key(nodeid):
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152 return 1
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153
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154 # not in the cache - check the database
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155 db = cldb or self.getclassdb(classname)
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156 res = db.has_key(nodeid)
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157 return res
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158
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159 def countnodes(self, classname, cldb=None):
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160 # include the new nodes not saved to the DB yet
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161 count = len(self.newnodes.get(classname, {}))
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162
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163 # and count those in the DB
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164 db = cldb or self.getclassdb(classname)
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165 count = count + len(db.keys())
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166 return count
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167
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168 def getnodeids(self, classname, cldb=None):
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169 # start off with the new nodes
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170 res = self.newnodes.get(classname, {}).keys()
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171
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172 db = cldb or self.getclassdb(classname)
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173 res = res + db.keys()
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174 return res
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175
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176 #
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177 # Journal
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178 #
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179 def addjournal(self, classname, nodeid, action, params):
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180 ''' Journal the Action
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181 'action' may be:
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182
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183 'create' or 'set' -- 'params' is a dictionary of property values
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184 'link' or 'unlink' -- 'params' is (classname, nodeid, propname)
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185 'retire' -- 'params' is None
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186 '''
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187 self.transactions.append((self._doSaveJournal, (classname, nodeid,
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188 action, params)))
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189
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190 def getjournal(self, classname, nodeid):
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191 ''' get the journal for id
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192 '''
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193 # attempt to open the journal - in some rare cases, the journal may
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194 # not exist
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195 try:
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196 db = anydbm.open(os.path.join(self.dir, 'journals.%s'%classname),
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197 'r')
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198 except anydbm.open, error:
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199 if error.args[0] != 2: raise
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200 return []
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201 journal = marshal.loads(db[nodeid])
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202 res = []
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203 for entry in journal:
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204 (nodeid, date_stamp, self.journaltag, action, params) = entry
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205 date_obj = date.Date(date_stamp)
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206 res.append((nodeid, date_obj, self.journaltag, action, params))
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207 return res
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208
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209
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210 #
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211 # Basic transaction support
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212 #
252
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213 def commit(self):
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214 ''' Commit the current transactions.
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215 '''
252
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216 # lock the DB
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217 for method, args in self.transactions:
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218 # TODO: optimise this, duh!
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219 method(*args)
252
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220 # unlock the DB
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221
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222 # all transactions committed, back to normal
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223 self.cache = {}
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224 self.dirtynodes = {}
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225 self.newnodes = {}
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226 self.transactions = []
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227
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228 def _doSaveNode(self, classname, nodeid, node):
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229 db = self.getclassdb(classname, 'c')
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230 # now save the marshalled data
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231 db[nodeid] = marshal.dumps(node)
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232 db.close()
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233
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234 def _doSaveJournal(self, classname, nodeid, action, params):
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235 entry = (nodeid, date.Date().get_tuple(), self.journaltag, action,
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236 params)
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237 db = anydbm.open(os.path.join(self.dir, 'journals.%s'%classname), 'c')
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238 if db.has_key(nodeid):
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239 s = db[nodeid]
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240 l = marshal.loads(db[nodeid])
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241 l.append(entry)
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242 else:
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243 l = [entry]
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244 db[nodeid] = marshal.dumps(l)
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245 db.close()
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246
46
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247 def rollback(self):
252
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248 ''' Reverse all actions from the current transaction.
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249 '''
430
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250 self.cache = {}
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251 self.dirtynodes = {}
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252 self.newnodes = {}
252
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253 self.transactions = []
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254
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255 #
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256 #$Log: not supported by cvs2svn $
440
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257 #Revision 1.13 2001/12/02 05:06:16 richard
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258 #. We now use weakrefs in the Classes to keep the database reference, so
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259 # the close() method on the database is no longer needed.
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260 # I bumped the minimum python requirement up to 2.1 accordingly.
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261 #. #487480 ] roundup-server
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262 #. #487476 ] INSTALL.txt
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263 #
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264 #I also cleaned up the change message / post-edit stuff in the cgi client.
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265 #There's now a clearly marked "TODO: append the change note" where I believe
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266 #the change note should be added there. The "changes" list will obviously
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267 #have to be modified to be a dict of the changes, or somesuch.
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268 #
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diff changeset
269 #More testing needed.
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270 #
431
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271 #Revision 1.12 2001/12/01 07:17:50 richard
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272 #. We now have basic transaction support! Information is only written to
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273 # the database when the commit() method is called. Only the anydbm
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274 # backend is modified in this way - neither of the bsddb backends have been.
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275 # The mail, admin and cgi interfaces all use commit (except the admin tool
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276 # doesn't have a commit command, so interactive users can't commit...)
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277 #. Fixed login/registration forwarding the user to the right page (or not,
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278 # on a failure)
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279 #
430
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280 #Revision 1.11 2001/11/21 02:34:18 richard
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281 #Added a target version field to the extended issue schema
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282 #
394
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283 #Revision 1.10 2001/10/09 23:58:10 richard
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284 #Moved the data stringification up into the hyperdb.Class class' get, set
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285 #and create methods. This means that the data is also stringified for the
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286 #journal call, and removes duplication of code from the backends. The
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287 #backend code now only sees strings.
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288 #
275
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289 #Revision 1.9 2001/10/09 07:25:59 richard
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290 #Added the Password property type. See "pydoc roundup.password" for
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291 #implementation details. Have updated some of the documentation too.
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292 #
270
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293 #Revision 1.8 2001/09/29 13:27:00 richard
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294 #CGI interfaces now spit up a top-level index of all the instances they can
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295 #serve.
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296 #
252
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297 #Revision 1.7 2001/08/12 06:32:36 richard
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298 #using isinstance(blah, Foo) now instead of isFooType
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299 #
224
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300 #Revision 1.6 2001/08/07 00:24:42 richard
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301 #stupid typo
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302 #
214
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303 #Revision 1.5 2001/08/07 00:15:51 richard
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304 #Added the copyright/license notice to (nearly) all files at request of
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305 #Bizar Software.
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306 #
213
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307 #Revision 1.4 2001/07/30 01:41:36 richard
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308 #Makes schema changes mucho easier.
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309 #
149
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310 #Revision 1.3 2001/07/25 01:23:07 richard
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311 #Added the Roundup spec to the new documentation directory.
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312 #
71
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313 #Revision 1.2 2001/07/23 08:20:44 richard
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314 #Moved over to using marshal in the bsddb and anydbm backends.
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315 #roundup-admin now has a "freshen" command that'll load/save all nodes (not
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316 # retired - mod hyperdb.Class.list() so it lists retired nodes)
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3c5920433866 *sigh* some databases have _foo.so as their underlying implementation.
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317 #
71
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318 #
Roundup Issue Tracker: http://roundup-tracker.org/