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annotate roundup/backends/back_anydbm.py @ 224:ad2c98faec97

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using isinstance(blah, Foo) now instead of isFooType
author Richard Jones <richard@users.sourceforge.net>
date Sun, 12 Aug 2001 06:32:36 +0000
parents 18134bffab37
children 76c6994aa4e8
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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 1.7 2001-08-12 06:32:36 richard Exp $
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20 import anydbm, os, marshal
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21 from roundup import hyperdb, date
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22
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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
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45 #
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46 # Classes
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47 #
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48 def __getattr__(self, classname):
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49 """A convenient way of calling self.getclass(classname)."""
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50 return self.classes[classname]
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51
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52 def addclass(self, cl):
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53 cn = cl.classname
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54 if self.classes.has_key(cn):
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55 raise ValueError, cn
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56 self.classes[cn] = cl
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57
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58 def getclasses(self):
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59 """Return a list of the names of all existing classes."""
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60 l = self.classes.keys()
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61 l.sort()
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62 return l
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63
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64 def getclass(self, classname):
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65 """Get the Class object representing a particular class.
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66
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67 If 'classname' is not a valid class name, a KeyError is raised.
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68 """
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69 return self.classes[classname]
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70
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71 #
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72 # Class DBs
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73 #
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74 def clear(self):
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75 for cn in self.classes.keys():
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76 db = os.path.join(self.dir, 'nodes.%s'%cn)
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77 anydbm.open(db, 'n')
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78 db = os.path.join(self.dir, 'journals.%s'%cn)
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79 anydbm.open(db, 'n')
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80
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81 def getclassdb(self, classname, mode='r'):
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82 ''' grab a connection to the class db that will be used for
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83 multiple actions
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84 '''
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85 path = os.path.join(os.getcwd(), self.dir, 'nodes.%s'%classname)
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86 if os.path.exists(path):
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87 return anydbm.open(path, mode)
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88 else:
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89 return anydbm.open(path, 'n')
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90
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91 #
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92 # Nodes
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93 #
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94 def addnode(self, classname, nodeid, node):
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95 ''' add the specified node to its class's db
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96 '''
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97 db = self.getclassdb(classname, 'c')
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98
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99 # convert the instance data to builtin types
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100 properties = self.classes[classname].properties
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101 for key in properties.keys():
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102 if isinstance(properties[key], hyperdb.Date):
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103 node[key] = node[key].get_tuple()
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104 elif isinstance(properties[key], hyperdb.Interval):
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105 node[key] = node[key].get_tuple()
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106
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107 # now save the marshalled data
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108 db[nodeid] = marshal.dumps(node)
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109 db.close()
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110 setnode = addnode
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111
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112 def getnode(self, classname, nodeid, cldb=None):
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113 ''' add the specified node to its class's db
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114 '''
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115 db = cldb or self.getclassdb(classname)
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116 if not db.has_key(nodeid):
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117 raise IndexError, nodeid
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118 res = marshal.loads(db[nodeid])
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119
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120 # convert the marshalled data to instances
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121 properties = self.classes[classname].properties
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122 for key in properties.keys():
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123 if key == self.RETIRED_FLAG: continue
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124 if isinstance(properties[key], hyperdb.Date):
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125 res[key] = date.Date(res[key])
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126 elif isinstance(properties[key], hyperdb.Interval):
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127 res[key] = date.Interval(res[key])
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128
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129 if not cldb: db.close()
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130 return res
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131
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132 def hasnode(self, classname, nodeid, cldb=None):
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133 ''' add the specified node to its class's db
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134 '''
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135 db = cldb or self.getclassdb(classname)
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136 res = db.has_key(nodeid)
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137 if not cldb: db.close()
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138 return res
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139
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140 def countnodes(self, classname, cldb=None):
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141 db = cldb or self.getclassdb(classname)
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142 return len(db.keys())
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143 if not cldb: db.close()
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144 return res
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145
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146 def getnodeids(self, classname, cldb=None):
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147 db = cldb or self.getclassdb(classname)
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148 res = db.keys()
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149 if not cldb: db.close()
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150 return res
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151
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152 #
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153 # Journal
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154 #
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155 def addjournal(self, classname, nodeid, action, params):
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156 ''' Journal the Action
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157 'action' may be:
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158
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159 'create' or 'set' -- 'params' is a dictionary of property values
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160 'link' or 'unlink' -- 'params' is (classname, nodeid, propname)
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161 'retire' -- 'params' is None
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162 '''
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163 entry = (nodeid, date.Date().get_tuple(), self.journaltag, action,
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164 params)
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165 db = anydbm.open(os.path.join(self.dir, 'journals.%s'%classname), 'c')
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166 if db.has_key(nodeid):
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167 s = db[nodeid]
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168 l = marshal.loads(db[nodeid])
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169 l.append(entry)
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170 else:
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171 l = [entry]
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172 db[nodeid] = marshal.dumps(l)
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173 db.close()
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174
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175 def getjournal(self, classname, nodeid):
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176 ''' get the journal for id
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177 '''
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178 # attempt to open the journal - in some rare cases, the journal may
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179 # not exist
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180 try:
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181 db = anydbm.open(os.path.join(self.dir, 'journals.%s'%classname),
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182 'r')
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183 except anydbm.open, error:
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184 if error.args[0] != 2: raise
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185 return []
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186 journal = marshal.loads(db[nodeid])
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187 res = []
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188 for entry in journal:
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189 (nodeid, date_stamp, self.journaltag, action, params) = entry
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190 date_obj = date.Date(date_stamp)
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191 res.append((nodeid, date_obj, self.journaltag, action, params))
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192 db.close()
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193 return res
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194
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195 def close(self):
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196 ''' Close the Database - we must release the circular refs so that
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197 we can be del'ed and the underlying anydbm connections closed
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198 cleanly.
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199 '''
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200 self.classes = None
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201
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202
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203 #
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204 # Basic transaction support
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205 #
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206 # TODO: well, write these methods (and then use them in other code)
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207 def register_action(self):
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208 ''' Register an action to the transaction undo log
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209 '''
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210
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211 def commit(self):
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212 ''' Commit the current transaction, start a new one
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213 '''
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214
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215 def rollback(self):
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216 ''' Reverse all actions from the current transaction
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217 '''
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218
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219 #
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220 #$Log: not supported by cvs2svn $
224
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221 #Revision 1.6 2001/08/07 00:24:42 richard
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222 #stupid typo
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223 #
214
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224 #Revision 1.5 2001/08/07 00:15:51 richard
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225 #Added the copyright/license notice to (nearly) all files at request of
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226 #Bizar Software.
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227 #
213
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228 #Revision 1.4 2001/07/30 01:41:36 richard
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229 #Makes schema changes mucho easier.
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230 #
149
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231 #Revision 1.3 2001/07/25 01:23:07 richard
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232 #Added the Roundup spec to the new documentation directory.
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233 #
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234 #Revision 1.2 2001/07/23 08:20:44 richard
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235 #Moved over to using marshal in the bsddb and anydbm backends.
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236 #roundup-admin now has a "freshen" command that'll load/save all nodes (not
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237 # retired - mod hyperdb.Class.list() so it lists retired nodes)
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238 #
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239 #
Roundup Issue Tracker: http://roundup-tracker.org/