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annotate roundup/backends/back_bsddb.py @ 2497:e27578fc4e37

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export now stores file "content" in separate files in export directory
author Richard Jones <richard@users.sourceforge.net>
date Thu, 24 Jun 2004 07:05:04 +0000
parents fc52d57c6c3e
children 091711fb2f8c
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_bsddb.py,v 1.29 2004-02-11 23:55:08 richard Exp $
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19 '''This module defines a backend that saves the hyperdatabase in BSDDB.
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20 '''
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21 __docformat__ = 'restructuredtext'
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23 import bsddb, os, marshal
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24 from roundup import hyperdb, date
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25
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26 # these classes are so similar, we just use the anydbm methods
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27 from back_anydbm import Database, Class, FileClass, IssueClass
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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(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 # Class DBs
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36 #
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37 def clear(self):
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38 for cn in self.classes.keys():
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39 db = os.path.join(self.dir, 'nodes.%s'%cn)
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40 bsddb.btopen(db, 'n')
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41 db = os.path.join(self.dir, 'journals.%s'%cn)
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42 bsddb.btopen(db, 'n')
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43
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44 def getclassdb(self, classname, mode='r'):
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45 ''' grab a connection to the class db that will be used for
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46 multiple actions
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47 '''
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48 path = os.path.join(os.getcwd(), self.dir, 'nodes.%s'%classname)
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49 if os.path.exists(path):
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50 return bsddb.btopen(path, mode)
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51 else:
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52 return bsddb.btopen(path, 'c')
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53
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54 def opendb(self, name, mode):
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55 '''Low-level database opener that gets around anydbm/dbm
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56 eccentricities.
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57 '''
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58 if __debug__:
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59 print >>hyperdb.DEBUG, self, 'opendb', (self, name, mode)
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60 # determine which DB wrote the class file
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61 path = os.path.join(os.getcwd(), self.dir, name)
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62 if not os.path.exists(path):
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63 if __debug__:
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64 print >>hyperdb.DEBUG, "opendb bsddb.open(%r, 'c')"%path
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65 return bsddb.btopen(path, 'c')
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67 # open the database with the correct module
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68 if __debug__:
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69 print >>hyperdb.DEBUG, "opendb bsddb.open(%r, %r)"%(path, mode)
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70 return bsddb.btopen(path, mode)
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71
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72 #
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73 # Journal
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74 #
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75 def getjournal(self, classname, nodeid):
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76 ''' get the journal for id
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78 Raise IndexError if the node doesn't exist (as per history()'s
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79 API)
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80 '''
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81 if __debug__:
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82 print >>hyperdb.DEBUG, 'getjournal', (self, classname, nodeid)
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83
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84 # our journal result
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85 res = []
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86
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87 # add any journal entries for transactions not committed to the
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88 # database
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89 for method, args in self.transactions:
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90 if method != self.doSaveJournal:
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91 continue
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92 (cache_classname, cache_nodeid, cache_action, cache_params,
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93 cache_creator, cache_creation) = args
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94 if cache_classname == classname and cache_nodeid == nodeid:
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95 if not cache_creator:
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96 cache_creator = self.getuid()
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97 if not cache_creation:
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98 cache_creation = date.Date()
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99 res.append((cache_nodeid, cache_creation, cache_creator,
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100 cache_action, cache_params))
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101
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102 # attempt to open the journal - in some rare cases, the journal may
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103 # not exist
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104 try:
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105 db = bsddb.btopen(os.path.join(self.dir, 'journals.%s'%classname),
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106 'r')
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107 except bsddb.error, error:
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108 if error.args[0] != 2:
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109 # this isn't a "not found" error, be alarmed!
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110 raise
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111 if res:
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112 # we have unsaved journal entries, return them
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113 return res
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114 raise IndexError, 'no such %s %s'%(classname, nodeid)
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115 # more handling of bad journals
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116 if not db.has_key(nodeid):
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117 if res:
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118 # we have some unsaved journal entries, be happy!
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119 return res
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120 raise IndexError, 'no such %s %s'%(classname, nodeid)
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121 journal = marshal.loads(db[nodeid])
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122 db.close()
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123
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124 # add all the saved journal entries for this node
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125 for nodeid, date_stamp, user, action, params in journal:
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126 res.append((nodeid, date.Date(date_stamp), user, action, params))
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127 return res
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128
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129 def getCachedJournalDB(self, classname):
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130 ''' get the journal db, looking in our cache of databases for commit
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131 '''
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132 # get the database handle
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133 db_name = 'journals.%s'%classname
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134 if self.databases.has_key(db_name):
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135 return self.databases[db_name]
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136 else:
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137 db = bsddb.btopen(os.path.join(self.dir, db_name), 'c')
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138 self.databases[db_name] = db
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139 return db
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140
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