Mercurial > p > roundup > code

annotate roundup/backends/blobfiles.py @ 2570:2691c4e46780 maint-0.7

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merge from HEAd
author Richard Jones <richard@users.sourceforge.net>
date Wed, 14 Jul 2004 01:11:37 +0000
parents 4d112730e02f
children 638fc2dab5a1
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: blobfiles.py,v 1.12.2.1 2004-06-24 07:14:48 richard Exp $
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19 '''This module exports file storage for roundup backends.
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20 Files are stored into a directory hierarchy.
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21 '''
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22 __docformat__ = 'restructuredtext'
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23
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24 import os
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25
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26 def files_in_dir(dir):
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27 if not os.path.exists(dir):
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28 return 0
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29 num_files = 0
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30 for dir_entry in os.listdir(dir):
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31 full_filename = os.path.join(dir,dir_entry)
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32 if os.path.isfile(full_filename):
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33 num_files = num_files + 1
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34 elif os.path.isdir(full_filename):
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35 num_files = num_files + files_in_dir(full_filename)
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36 return num_files
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37
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38 class FileStorage:
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39 """Store files in some directory structure"""
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40 def filename(self, classname, nodeid, property=None):
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41 '''Determine what the filename for the given node and optionally
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42 property is.
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43 '''
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44 if property:
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45 name = '%s%s.%s'%(classname, nodeid, property)
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46 else:
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47 # roundupdb.FileClass never specified the property name, so don't
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48 # include it
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49 name = '%s%s'%(classname, nodeid)
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50
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51 # have a separate subdir for every thousand messages
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52 subdir = str(int(nodeid) / 1000)
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53 return os.path.join(self.dir, 'files', classname, subdir, name)
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54
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55 def filename_flat(self, classname, nodeid, property=None):
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56 '''Determine what the filename for the given node and optionally
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57 property is.
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58 '''
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59 if property:
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60 return os.path.join(self.dir, 'files', '%s%s.%s'%(classname,
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61 nodeid, property))
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62 else:
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63 # roundupdb.FileClass never specified the property name, so don't
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64 # include it
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65 return os.path.join(self.dir, 'files', '%s%s'%(classname,
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66 nodeid))
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67
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68 def storefile(self, classname, nodeid, property, content):
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69 '''Store the content of the file in the database. The property may be
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70 None, in which case the filename does not indicate which property
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71 is being saved.
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72 '''
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73 # determine the name of the file to write to
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74 name = self.filename(classname, nodeid, property)
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75
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76 # make sure the file storage dir exists
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77 if not os.path.exists(os.path.dirname(name)):
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78 os.makedirs(os.path.dirname(name))
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79
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80 # save to a temp file
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81 name = name + '.tmp'
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82 # make sure we don't register the rename action more than once
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83 if not os.path.exists(name):
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84 # save off the rename action
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85 self.transactions.append((self.doStoreFile, (classname, nodeid,
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86 property)))
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87 open(name, 'wb').write(content)
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88
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89 def getfile(self, classname, nodeid, property):
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90 '''Get the content of the file in the database.
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91 '''
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92 # try a variety of different filenames - the file could be in the
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93 # usual place, or it could be in a temp file pre-commit *or* it
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94 # could be in an old-style, backwards-compatible flat directory
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95 filename = self.filename(classname, nodeid, property)
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96 flat_filename = self.filename_flat(classname, nodeid, property)
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97 for filename in (filename, filename+'.tmp', flat_filename):
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98 if os.path.exists(filename):
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99 f = open(filename, 'rb')
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100 break
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101 else:
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102 raise IOError, 'content file not found'
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103 # snarf the contents and make sure we close the file
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104 content = f.read()
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105 f.close()
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106 return content
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107
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108 def numfiles(self):
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109 '''Get number of files in storage, even across subdirectories.
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110 '''
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111 files_dir = os.path.join(self.dir, 'files')
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112 return files_in_dir(files_dir)
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113
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114 def doStoreFile(self, classname, nodeid, property, **databases):
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115 '''Store the file as part of a transaction commit.
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116 '''
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117 # determine the name of the file to write to
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118 name = self.filename(classname, nodeid, property)
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119
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120 # content is being updated (and some platforms, eg. win32, won't
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121 # let us rename over the top of the old file)
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122 if os.path.exists(name):
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123 os.remove(name)
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124
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125 # the file is currently ".tmp" - move it to its real name to commit
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126 os.rename(name+".tmp", name)
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127
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128 # return the classname, nodeid so we reindex this content
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129 return (classname, nodeid)
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130
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131 def rollbackStoreFile(self, classname, nodeid, property, **databases):
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132 '''Remove the temp file as a part of a rollback
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133 '''
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134 # determine the name of the file to delete
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135 name = self.filename(classname, nodeid, property)
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136 if os.path.exists(name+".tmp"):
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137 os.remove(name+".tmp")
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138
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139 # vim: set filetype=python ts=4 sw=4 et si
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