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annotate roundup/backends/back_anydbm.py @ 252:76c6994aa4e8

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CGI interfaces now spit up a top-level index of all instances they can serve.
author Richard Jones <richard@users.sourceforge.net>
date Sat, 29 Sep 2001 13:27:00 +0000
parents ad2c98faec97
children a4241ddd22d7
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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 #
252
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18 #$Id: back_anydbm.py,v 1.8 2001-09-29 13:27:00 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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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
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100 # convert the instance data to builtin types
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101 properties = self.classes[classname].properties
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102 for key in properties.keys():
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103 if isinstance(properties[key], hyperdb.Date):
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104 node[key] = node[key].get_tuple()
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105 elif isinstance(properties[key], hyperdb.Interval):
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106 node[key] = node[key].get_tuple()
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107
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108 # now save the marshalled data
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109 db[nodeid] = marshal.dumps(node)
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110 db.close()
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111 setnode = addnode
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112
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113 def getnode(self, classname, nodeid, cldb=None):
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114 ''' add the specified node to its class's db
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115 '''
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116 db = cldb or self.getclassdb(classname)
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117 if not db.has_key(nodeid):
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118 raise IndexError, nodeid
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119 res = marshal.loads(db[nodeid])
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120
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121 # convert the marshalled data to instances
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122 properties = self.classes[classname].properties
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123 for key in properties.keys():
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124 if key == self.RETIRED_FLAG: continue
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125 if isinstance(properties[key], hyperdb.Date):
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126 res[key] = date.Date(res[key])
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127 elif isinstance(properties[key], hyperdb.Interval):
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128 res[key] = date.Interval(res[key])
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129
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130 if not cldb: db.close()
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131 return res
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132
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133 def hasnode(self, classname, nodeid, cldb=None):
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134 ''' add the specified node to its class's db
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135 '''
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136 db = cldb or self.getclassdb(classname)
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137 res = db.has_key(nodeid)
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138 if not cldb: db.close()
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139 return res
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140
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141 def countnodes(self, classname, cldb=None):
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142 db = cldb or self.getclassdb(classname)
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143 return len(db.keys())
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144 if not cldb: db.close()
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145 return res
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146
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147 def getnodeids(self, classname, cldb=None):
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148 db = cldb or self.getclassdb(classname)
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149 res = db.keys()
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150 if not cldb: db.close()
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151 return res
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152
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153 #
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154 # Journal
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155 #
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156 def addjournal(self, classname, nodeid, action, params):
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157 ''' Journal the Action
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158 'action' may be:
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159
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160 'create' or 'set' -- 'params' is a dictionary of property values
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161 'link' or 'unlink' -- 'params' is (classname, nodeid, propname)
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162 'retire' -- 'params' is None
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163 '''
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164 entry = (nodeid, date.Date().get_tuple(), self.journaltag, action,
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165 params)
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166 db = anydbm.open(os.path.join(self.dir, 'journals.%s'%classname), 'c')
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167 if db.has_key(nodeid):
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168 s = db[nodeid]
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169 l = marshal.loads(db[nodeid])
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170 l.append(entry)
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171 else:
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172 l = [entry]
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173 db[nodeid] = marshal.dumps(l)
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174 db.close()
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175
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176 def getjournal(self, classname, nodeid):
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177 ''' get the journal for id
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178 '''
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179 # attempt to open the journal - in some rare cases, the journal may
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180 # not exist
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181 try:
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182 db = anydbm.open(os.path.join(self.dir, 'journals.%s'%classname),
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183 'r')
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184 except anydbm.open, error:
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185 if error.args[0] != 2: raise
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186 return []
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187 journal = marshal.loads(db[nodeid])
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188 res = []
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189 for entry in journal:
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190 (nodeid, date_stamp, self.journaltag, action, params) = entry
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191 date_obj = date.Date(date_stamp)
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192 res.append((nodeid, date_obj, self.journaltag, action, params))
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193 db.close()
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194 return res
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195
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196 def close(self):
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197 ''' Close the Database - we must release the circular refs so that
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198 we can be del'ed and the underlying anydbm connections closed
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199 cleanly.
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200 '''
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201 self.classes = None
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202
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203
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204 #
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205 # Basic transaction support
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206 #
252
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207 def commit(self):
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208 ''' Commit the current transactions.
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209 '''
252
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210 # lock the DB
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211 for action, classname, entry in self.transactions:
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212 # write the node, figure what's changed for the journal.
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213 pass
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214 # unlock the DB
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215
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216 def rollback(self):
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217 ''' Reverse all actions from the current transaction.
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218 '''
252
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219 self.transactions = []
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220
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221 #
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222 #$Log: not supported by cvs2svn $
252
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223 #Revision 1.7 2001/08/12 06:32:36 richard
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224 #using isinstance(blah, Foo) now instead of isFooType
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225 #
224
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226 #Revision 1.6 2001/08/07 00:24:42 richard
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227 #stupid typo
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228 #
214
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229 #Revision 1.5 2001/08/07 00:15:51 richard
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230 #Added the copyright/license notice to (nearly) all files at request of
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231 #Bizar Software.
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232 #
213
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233 #Revision 1.4 2001/07/30 01:41:36 richard
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234 #Makes schema changes mucho easier.
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235 #
149
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236 #Revision 1.3 2001/07/25 01:23:07 richard
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237 #Added the Roundup spec to the new documentation directory.
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238 #
71
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239 #Revision 1.2 2001/07/23 08:20:44 richard
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240 #Moved over to using marshal in the bsddb and anydbm backends.
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241 #roundup-admin now has a "freshen" command that'll load/save all nodes (not
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242 # retired - mod hyperdb.Class.list() so it lists retired nodes)
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243 #
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244 #
Roundup Issue Tracker: http://roundup-tracker.org/