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annotate roundup/backends/back_anydbm.py @ 275:1cc866cec608

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Moved the data stringification up into the hyperdb.Class class's... ...get, set and create methods. This means that the data is also stringified for the journal call, and removes duplication of code from the backends. The backend code now only sees strings.
author Richard Jones <richard@users.sourceforge.net>
date Tue, 09 Oct 2001 23:58:10 +0000
parents a4241ddd22d7
children f43af1e97fdd
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 #
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18 #$Id: back_anydbm.py,v 1.10 2001-10-09 23:58:10 richard Exp $
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20 import anydbm, os, marshal
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21 from roundup import hyperdb, date, password
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23 #
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24 # Now the database
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25 #
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26 class Database(hyperdb.Database):
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27 """A database for storing records containing flexible data types."""
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28
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29 def __init__(self, storagelocator, journaltag=None):
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30 """Open a hyperdatabase given a specifier to some storage.
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31
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32 The meaning of 'storagelocator' depends on the particular
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33 implementation of the hyperdatabase. It could be a file name,
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34 a directory path, a socket descriptor for a connection to a
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35 database over the network, etc.
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36
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37 The 'journaltag' is a token that will be attached to the journal
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38 entries for any edits done on the database. If 'journaltag' is
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39 None, the database is opened in read-only mode: the Class.create(),
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40 Class.set(), and Class.retire() methods are disabled.
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41 """
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42 self.dir, self.journaltag = storagelocator, journaltag
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43 self.classes = {}
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44 self.transactions = []
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45
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46 #
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47 # Classes
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48 #
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49 def __getattr__(self, classname):
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50 """A convenient way of calling self.getclass(classname)."""
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51 return self.classes[classname]
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52
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53 def addclass(self, cl):
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54 cn = cl.classname
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55 if self.classes.has_key(cn):
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56 raise ValueError, cn
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57 self.classes[cn] = cl
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58
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59 def getclasses(self):
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60 """Return a list of the names of all existing classes."""
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61 l = self.classes.keys()
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62 l.sort()
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63 return l
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64
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65 def getclass(self, classname):
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66 """Get the Class object representing a particular class.
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67
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68 If 'classname' is not a valid class name, a KeyError is raised.
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69 """
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70 return self.classes[classname]
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71
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72 #
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73 # Class DBs
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74 #
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75 def clear(self):
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76 for cn in self.classes.keys():
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77 db = os.path.join(self.dir, 'nodes.%s'%cn)
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78 anydbm.open(db, 'n')
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79 db = os.path.join(self.dir, 'journals.%s'%cn)
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80 anydbm.open(db, 'n')
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81
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82 def getclassdb(self, classname, mode='r'):
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83 ''' grab a connection to the class db that will be used for
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84 multiple actions
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85 '''
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86 path = os.path.join(os.getcwd(), self.dir, 'nodes.%s'%classname)
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87 if os.path.exists(path):
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88 return anydbm.open(path, mode)
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89 else:
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90 return anydbm.open(path, 'n')
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91
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92 #
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93 # Nodes
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94 #
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95 def addnode(self, classname, nodeid, node):
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96 ''' add the specified node to its class's db
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97 '''
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98 db = self.getclassdb(classname, 'c')
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99 # now save the marshalled data
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100 db[nodeid] = marshal.dumps(node)
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101 db.close()
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102 setnode = addnode
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103
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104 def getnode(self, classname, nodeid, cldb=None):
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105 ''' add the specified node to its class's db
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106 '''
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107 db = cldb or self.getclassdb(classname)
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108 if not db.has_key(nodeid):
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109 raise IndexError, nodeid
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110 res = marshal.loads(db[nodeid])
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111 if not cldb: db.close()
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112 return res
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113
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114 def hasnode(self, classname, nodeid, cldb=None):
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115 ''' add the specified node to its class's db
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116 '''
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117 db = cldb or self.getclassdb(classname)
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118 res = db.has_key(nodeid)
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119 if not cldb: db.close()
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120 return res
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121
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122 def countnodes(self, classname, cldb=None):
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123 db = cldb or self.getclassdb(classname)
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124 return len(db.keys())
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125 if not cldb: db.close()
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126 return res
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127
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128 def getnodeids(self, classname, cldb=None):
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129 db = cldb or self.getclassdb(classname)
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130 res = db.keys()
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131 if not cldb: db.close()
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132 return res
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133
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134 #
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135 # Journal
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136 #
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137 def addjournal(self, classname, nodeid, action, params):
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138 ''' Journal the Action
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139 'action' may be:
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140
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141 'create' or 'set' -- 'params' is a dictionary of property values
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142 'link' or 'unlink' -- 'params' is (classname, nodeid, propname)
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143 'retire' -- 'params' is None
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144 '''
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145 entry = (nodeid, date.Date().get_tuple(), self.journaltag, action,
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146 params)
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147 db = anydbm.open(os.path.join(self.dir, 'journals.%s'%classname), 'c')
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148 if db.has_key(nodeid):
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149 s = db[nodeid]
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150 l = marshal.loads(db[nodeid])
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151 l.append(entry)
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152 else:
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153 l = [entry]
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154 db[nodeid] = marshal.dumps(l)
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155 db.close()
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156
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157 def getjournal(self, classname, nodeid):
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158 ''' get the journal for id
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159 '''
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160 # attempt to open the journal - in some rare cases, the journal may
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161 # not exist
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162 try:
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163 db = anydbm.open(os.path.join(self.dir, 'journals.%s'%classname),
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164 'r')
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165 except anydbm.open, error:
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166 if error.args[0] != 2: raise
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167 return []
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168 journal = marshal.loads(db[nodeid])
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169 res = []
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170 for entry in journal:
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171 (nodeid, date_stamp, self.journaltag, action, params) = entry
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172 date_obj = date.Date(date_stamp)
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173 res.append((nodeid, date_obj, self.journaltag, action, params))
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174 db.close()
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175 return res
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176
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177 def close(self):
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178 ''' Close the Database - we must release the circular refs so that
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179 we can be del'ed and the underlying anydbm connections closed
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180 cleanly.
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181 '''
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182 self.classes = None
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183
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184
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185 #
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186 # Basic transaction support
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187 #
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188 def commit(self):
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189 ''' Commit the current transactions.
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190 '''
252
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191 # lock the DB
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192 for action, classname, entry in self.transactions:
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193 # write the node, figure what's changed for the journal.
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194 pass
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195 # unlock the DB
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196
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197 def rollback(self):
252
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198 ''' Reverse all actions from the current transaction.
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199 '''
252
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200 self.transactions = []
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201
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202 #
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203 #$Log: not supported by cvs2svn $
275
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204 #Revision 1.9 2001/10/09 07:25:59 richard
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205 #Added the Password property type. See "pydoc roundup.password" for
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206 #implementation details. Have updated some of the documentation too.
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207 #
270
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208 #Revision 1.8 2001/09/29 13:27:00 richard
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209 #CGI interfaces now spit up a top-level index of all the instances they can
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210 #serve.
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211 #
252
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212 #Revision 1.7 2001/08/12 06:32:36 richard
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213 #using isinstance(blah, Foo) now instead of isFooType
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214 #
224
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215 #Revision 1.6 2001/08/07 00:24:42 richard
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216 #stupid typo
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217 #
214
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218 #Revision 1.5 2001/08/07 00:15:51 richard
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219 #Added the copyright/license notice to (nearly) all files at request of
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220 #Bizar Software.
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221 #
213
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222 #Revision 1.4 2001/07/30 01:41:36 richard
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223 #Makes schema changes mucho easier.
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224 #
149
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225 #Revision 1.3 2001/07/25 01:23:07 richard
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226 #Added the Roundup spec to the new documentation directory.
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227 #
71
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228 #Revision 1.2 2001/07/23 08:20:44 richard
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229 #Moved over to using marshal in the bsddb and anydbm backends.
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230 #roundup-admin now has a "freshen" command that'll load/save all nodes (not
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231 # retired - mod hyperdb.Class.list() so it lists retired nodes)
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232 #
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233 #
Roundup Issue Tracker: http://roundup-tracker.org/