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annotate roundup/backends/back_bsddb3.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 01b5afc087ae
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_bsddb3.py,v 1.23 2004-05-05 01:17:42 richard Exp $
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19 '''This module defines a backend that saves the hyperdatabase in BSDDB3.
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20 '''
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21 __docformat__ = 'restructuredtext'
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22
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23 import bsddb3, os, marshal, errno
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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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28
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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 for name in 'nodes.%s'%cn, 'journals.%s'%cn:
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40 try:
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41 os.remove(os.path.join(self.dir, name))
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42 except os.error, error:
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43 if error.errno != errno.ENOENT:
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44 raise
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45
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46 def getclassdb(self, classname, mode='r'):
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47 ''' grab a connection to the class db that will be used for
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48 multiple actions
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49 '''
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50 path = os.path.join(os.getcwd(), self.dir, 'nodes.%s'%classname)
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51 if os.path.exists(path):
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52 return bsddb3.btopen(path, mode)
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53 else:
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54 return bsddb3.btopen(path, 'c')
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55
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56 def opendb(self, name, mode):
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57 '''Low-level database opener that gets around anydbm/dbm
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58 eccentricities.
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59 '''
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60 if __debug__:
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61 print >>hyperdb.DEBUG, self, 'opendb', (self, name, mode)
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62 # determine which DB wrote the class file
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63 path = os.path.join(os.getcwd(), self.dir, name)
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64 if not os.path.exists(path):
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65 if __debug__:
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66 print >>hyperdb.DEBUG, "opendb bsddb3.open(%r, 'c')"%path
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67 return bsddb3.btopen(path, 'c')
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68
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69 # open the database with the correct module
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70 if __debug__:
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71 print >>hyperdb.DEBUG, "opendb bsddb3.open(%r, %r)"%(path, mode)
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72 return bsddb3.btopen(path, mode)
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73
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74 #
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75 # Journal
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76 #
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77 def getjournal(self, classname, nodeid):
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78 ''' get the journal for id
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79
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80 Raise IndexError if the node doesn't exist (as per history()'s
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81 API)
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82 '''
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83 if __debug__:
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84 print >>hyperdb.DEBUG, 'getjournal', (self, classname, nodeid)
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85
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86 # our journal result
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87 res = []
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88
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89 # add any journal entries for transactions not committed to the
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90 # database
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91 for method, args in self.transactions:
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92 if method != self.doSaveJournal:
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93 continue
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94 (cache_classname, cache_nodeid, cache_action, cache_params,
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95 cache_creator, cache_creation) = args
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96 if cache_classname == classname and cache_nodeid == nodeid:
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97 if not cache_creator:
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98 cache_creator = self.getuid()
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99 if not cache_creation:
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100 cache_creation = date.Date()
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101 res.append((cache_nodeid, cache_creation, cache_creator,
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102 cache_action, cache_params))
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103
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104 # attempt to open the journal - in some rare cases, the journal may
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105 # not exist
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106 try:
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107 db = bsddb3.btopen(os.path.join(self.dir, 'journals.%s'%classname),
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108 'r')
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109 except bsddb3._db.DBNoSuchFileError:
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110 if res:
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111 # we have unsaved journal entries, return them
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112 return res
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113 raise IndexError, 'no such %s %s'%(classname, nodeid)
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114 # more handling of bad journals
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115 if not db.has_key(nodeid):
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116 db.close()
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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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Richard Jones <richard@users.sourceforge.net>
parents: 858
diff changeset
137 db = bsddb3.btopen(os.path.join(self.dir, db_name), 'c')
974a4b94c5e3 Implemented the destroy() method needed by the session database...
Richard Jones <richard@users.sourceforge.net>
parents: 858
diff changeset
138 self.databases[db_name] = db
974a4b94c5e3 Implemented the destroy() method needed by the session database...
Richard Jones <richard@users.sourceforge.net>
parents: 858
diff changeset
139 return db
974a4b94c5e3 Implemented the destroy() method needed by the session database...
Richard Jones <richard@users.sourceforge.net>
parents: 858
diff changeset
140
Roundup Issue Tracker: http://roundup-tracker.org/