Mercurial > p > roundup > code

annotate roundup/instance.py @ 4419:eade357a1a16

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- update acknowledgements
author Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
date Mon, 13 Sep 2010 17:08:41 +0000
parents b9eb72f20b4d
children 80a9295a60fd
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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
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19 """Top-level tracker interface.
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20
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21 Open a tracker with:
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22
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23 >>> from roundup import instance
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24 >>> db = instance.open('path to tracker home')
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25
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26 The "db" handle you get back is the tracker's hyperdb which has the interface
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27 described in `roundup.hyperdb.Database`.
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28 """
2005
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29 __docformat__ = 'restructuredtext'
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30
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31 import os
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32 import sys
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33 from roundup import configuration, mailgw
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34 from roundup import hyperdb, backends, actions
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35 from roundup.cgi import client, templating
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36 from roundup.cgi import actions as cgi_actions
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37
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38 class Vars:
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39 def __init__(self, vars):
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40 self.__dict__.update(vars)
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41
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42 class Tracker:
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43 def __init__(self, tracker_home, optimize=0):
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44 """New-style tracker instance constructor
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45
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46 Parameters:
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47 tracker_home:
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48 tracker home directory
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49 optimize:
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50 if set, precompile html templates
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51
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52 """
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53 self.tracker_home = tracker_home
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54 self.optimize = optimize
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55 # if set, call schema_hook after executing schema.py will get
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56 # same variables (in particular db) as schema.py main purpose is
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57 # for regression tests
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58 self.schema_hook = None
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59 self.config = configuration.CoreConfig(tracker_home)
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60 self.actions = {}
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61 self.cgi_actions = {}
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62 self.templating_utils = {}
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63 self.load_interfaces()
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64 self.templates = templating.Templates(self.config["TEMPLATES"])
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65 self.backend = backends.get_backend(self.get_backend_name())
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66 if self.optimize:
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67 libdir = os.path.join(self.tracker_home, 'lib')
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68 if os.path.isdir(libdir):
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69 sys.path.insert(1, libdir)
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70 self.templates.precompileTemplates()
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71 # initialize tracker extensions
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72 for extension in self.get_extensions('extensions'):
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73 extension(self)
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74 # load database schema
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75 schemafilename = os.path.join(self.tracker_home, 'schema.py')
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76 # Note: can't use built-in open()
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77 # because of the global function with the same name
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78 schemafile = file(schemafilename, 'rt')
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79 self.schema = compile(schemafile.read(), schemafilename, 'exec')
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80 schemafile.close()
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81 # load database detectors
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82 self.detectors = self.get_extensions('detectors')
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83 # db_open is set to True after first open()
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84 self.db_open = 0
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85 if libdir in sys.path:
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86 sys.path.remove(libdir)
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87
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88 def get_backend_name(self):
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89 o = __builtins__['open']
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90 f = o(os.path.join(self.config.DATABASE, 'backend_name'))
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91 name = f.readline().strip()
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92 f.close()
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93 return name
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94
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95 def open(self, name=None):
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96 # load the database schema
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97 # we cannot skip this part even if self.optimize is set
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98 # because the schema has security settings that must be
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99 # applied to each database instance
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100 backend = self.backend
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101 vars = {
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102 'Class': backend.Class,
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103 'FileClass': backend.FileClass,
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104 'IssueClass': backend.IssueClass,
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105 'String': hyperdb.String,
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106 'Password': hyperdb.Password,
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107 'Date': hyperdb.Date,
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108 'Link': hyperdb.Link,
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109 'Multilink': hyperdb.Multilink,
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110 'Interval': hyperdb.Interval,
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111 'Boolean': hyperdb.Boolean,
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112 'Number': hyperdb.Number,
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113 'db': backend.Database(self.config, name)
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114 }
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115
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116 if self.optimize:
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117 # execute preloaded schema object
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118 exec(self.schema, vars)
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119 if callable (self.schema_hook):
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120 self.schema_hook(**vars)
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121 # use preloaded detectors
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122 detectors = self.detectors
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123 else:
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124 libdir = os.path.join(self.tracker_home, 'lib')
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125 if os.path.isdir(libdir):
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126 sys.path.insert(1, libdir)
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127 # execute the schema file
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128 self._load_python('schema.py', vars)
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129 if callable (self.schema_hook):
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130 self.schema_hook(**vars)
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131 # reload extensions and detectors
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132 for extension in self.get_extensions('extensions'):
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133 extension(self)
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134 detectors = self.get_extensions('detectors')
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135 if libdir in sys.path:
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136 sys.path.remove(libdir)
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137 db = vars['db']
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138 # apply the detectors
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139 for detector in detectors:
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140 detector(db)
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141 # if we are running in debug mode
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142 # or this is the first time the database is opened,
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143 # do database upgrade checks
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144 if not (self.optimize and self.db_open):
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145 # As a consistency check, ensure that every link property is
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146 # pointing at a defined class. Otherwise, the schema is
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147 # internally inconsistent. This is an important safety
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148 # measure as it protects against an accidental schema change
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149 # dropping a table while there are still links to the table;
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150 # once the table has been dropped, there is no way to get it
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151 # back, so it is important to drop it only if we are as sure
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152 # as possible that it is no longer needed.
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153 classes = db.getclasses()
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154 for classname in classes:
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155 cl = db.getclass(classname)
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156 for propname, prop in cl.getprops().iteritems():
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157 if not isinstance(prop, (hyperdb.Link,
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158 hyperdb.Multilink)):
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159 continue
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160 linkto = prop.classname
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161 if linkto not in classes:
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162 raise ValueError, \
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163 ("property %s.%s links to non-existent class %s"
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164 % (classname, propname, linkto))
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165
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166 db.post_init()
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167 self.db_open = 1
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168 return db
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169
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170 def load_interfaces(self):
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171 """load interfaces.py (if any), initialize Client and MailGW attrs"""
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172 vars = {}
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173 if os.path.isfile(os.path.join(self.tracker_home, 'interfaces.py')):
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174 self._load_python('interfaces.py', vars)
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175 self.Client = vars.get('Client', client.Client)
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176 self.MailGW = vars.get('MailGW', mailgw.MailGW)
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177
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178 def get_extensions(self, dirname):
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179 """Load python extensions
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180
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181 Parameters:
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182 dirname:
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183 extension directory name relative to tracker home
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184
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185 Return value:
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186 list of init() functions for each extension
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187
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188 """
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189 extensions = []
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190 dirpath = os.path.join(self.tracker_home, dirname)
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191 if os.path.isdir(dirpath):
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192 sys.path.insert(1, dirpath)
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193 for name in os.listdir(dirpath):
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194 if not name.endswith('.py'):
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195 continue
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196 vars = {}
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197 self._load_python(os.path.join(dirname, name), vars)
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198 extensions.append(vars['init'])
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199 sys.path.remove(dirpath)
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200 return extensions
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201
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202 def init(self, adminpw):
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203 db = self.open('admin')
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204 self._load_python('initial_data.py', {'db': db, 'adminpw': adminpw,
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205 'admin_email': self.config['ADMIN_EMAIL']})
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206 db.commit()
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207 db.close()
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208
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209 def exists(self):
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210 return self.backend.db_exists(self.config)
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211
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212 def nuke(self):
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213 self.backend.db_nuke(self.config)
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214
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215 def _load_python(self, file, vars):
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216 file = os.path.join(self.tracker_home, file)
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217 execfile(file, vars)
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218 return vars
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219
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220 def registerAction(self, name, action):
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221
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222 # The logic here is this:
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223 # * if `action` derives from actions.Action,
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224 # it is executable as a generic action.
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225 # * if, moreover, it also derives from cgi.actions.Bridge,
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226 # it may in addition be called via CGI
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227 # * in all other cases we register it as a CGI action, without
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228 # any check (for backward compatibility).
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229 if issubclass(action, actions.Action):
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230 self.actions[name] = action
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231 if issubclass(action, cgi_actions.Bridge):
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232 self.cgi_actions[name] = action
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233 else:
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234 self.cgi_actions[name] = action
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235
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236 def registerUtil(self, name, function):
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237 self.templating_utils[name] = function
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238
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239 class TrackerError(Exception):
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240 pass
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241
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242
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243 class OldStyleTrackers:
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244 def __init__(self):
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245 self.number = 0
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246 self.trackers = {}
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247
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248 def open(self, tracker_home, optimize=0):
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249 """Open the tracker.
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250
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251 Parameters:
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252 tracker_home:
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253 tracker home directory
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254 optimize:
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255 if set, precompile html templates
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256
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257 Raise ValueError if the tracker home doesn't exist.
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258
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259 """
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260 import imp
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261 # sanity check existence of tracker home
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262 if not os.path.exists(tracker_home):
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263 raise ValueError, 'no such directory: "%s"'%tracker_home
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264
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265 # sanity check tracker home contents
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266 for reqd in 'config dbinit select_db interfaces'.split():
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267 if not os.path.exists(os.path.join(tracker_home, '%s.py'%reqd)):
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268 raise TrackerError, 'File "%s.py" missing from tracker '\
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269 'home "%s"'%(reqd, tracker_home)
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270
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271 if self.trackers.has_key(tracker_home):
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272 return imp.load_package(self.trackers[tracker_home],
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273 tracker_home)
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274 # register all available backend modules
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275 backends.list_backends()
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276 self.number = self.number + 1
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277 modname = '_roundup_tracker_%s'%self.number
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278 self.trackers[tracker_home] = modname
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279
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280 # load the tracker
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281 tracker = imp.load_package(modname, tracker_home)
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282
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283 # ensure the tracker has all the required bits
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284 for required in 'open init Client MailGW'.split():
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285 if not hasattr(tracker, required):
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286 raise TrackerError, \
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287 'Required tracker attribute "%s" missing'%required
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288
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289 # load and apply the config
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290 tracker.config = configuration.CoreConfig(tracker_home)
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291 tracker.dbinit.config = tracker.config
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292
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293 tracker.optimize = optimize
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294 tracker.templates = templating.Templates(tracker.config["TEMPLATES"])
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295 if optimize:
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296 tracker.templates.precompileTemplates()
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297
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298 return tracker
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299
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300 OldStyleTrackers = OldStyleTrackers()
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301 def open(tracker_home, optimize=0):
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302 if os.path.exists(os.path.join(tracker_home, 'dbinit.py')):
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303 # user should upgrade...
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304 return OldStyleTrackers.open(tracker_home, optimize=optimize)
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305
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306 return Tracker(tracker_home, optimize=optimize)
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307
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308 # vim: set filetype=python sts=4 sw=4 et si :
Roundup Issue Tracker: http://roundup-tracker.org/