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annotate roundup/backends/back_bsddb3.py @ 1244:8dd4f736370b

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merge from maintenance branch
author Richard Jones <richard@users.sourceforge.net>
date Thu, 03 Oct 2002 06:56:30 +0000
parents c7119e74fcf8
children 8a908bbad1ef
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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 1.18 2002-10-03 06:56:29 richard Exp $
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19 '''
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20 This module defines a backend that saves the hyperdatabase in BSDDB3.
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21 '''
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22
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23 import bsddb3, 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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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 db = os.path.join(self.dir, 'nodes.%s'%cn)
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40 bsddb3.btopen(db, 'n')
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41 db = os.path.join(self.dir, 'journals.%s'%cn)
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42 bsddb3.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 bsddb3.btopen(path, mode)
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51 else:
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52 return bsddb3.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 bsddb3.open(%r, 'c')"%path
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65 return bsddb3.btopen(path, 'c')
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66
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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 bsddb3.open(%r, %r)"%(path, mode)
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70 return bsddb3.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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77 '''
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78 # attempt to open the journal - in some rare cases, the journal may
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79 # not exist
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80 try:
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81 db = bsddb3.btopen(os.path.join(self.dir, 'journals.%s'%classname),
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82 'r')
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83 except bsddb3._db.DBNoSuchFileError:
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84 raise IndexError, 'no such %s %s'%(classname, nodeid)
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85 # more handling of bad journals
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86 if not db.has_key(nodeid):
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87 raise IndexError, 'no such %s %s'%(classname, nodeid)
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88 journal = marshal.loads(db[nodeid])
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89 res = []
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90 for entry in journal:
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91 (nodeid, date_stamp, user, action, params) = entry
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92 date_obj = date.Date(date_stamp)
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93 res.append((nodeid, date_obj, user, action, params))
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94 db.close()
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95 return res
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96
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97 def getCachedJournalDB(self, classname):
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98 ''' get the journal db, looking in our cache of databases for commit
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99 '''
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100 # get the database handle
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101 db_name = 'journals.%s'%classname
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102 if self.databases.has_key(db_name):
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103 return self.databases[db_name]
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104 else:
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105 db = bsddb3.btopen(os.path.join(self.dir, db_name), 'c')
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106 self.databases[db_name] = db
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107 return db
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108
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