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annotate roundup/instance.py @ 4305:e39b88a7150a

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- update with possible tracker issue
author Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
date Mon, 14 Dec 2009 21:48:51 +0000
parents 2b75274936bc
children a0be2bc223f5
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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 """Tracker handling (open tracker).
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20
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21 Backwards compatibility for the old-style "imported" trackers.
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22 """
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23 __docformat__ = 'restructuredtext'
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24
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25 import os
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26 import sys
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27 from roundup import configuration, mailgw
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28 from roundup import hyperdb, backends, actions
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29 from roundup.cgi import client, templating
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30 from roundup.cgi import actions as cgi_actions
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31
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32 class Vars:
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33 def __init__(self, vars):
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34 self.__dict__.update(vars)
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35
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36 class Tracker:
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37 def __init__(self, tracker_home, optimize=0):
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38 """New-style tracker instance constructor
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39
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40 Parameters:
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41 tracker_home:
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42 tracker home directory
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43 optimize:
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44 if set, precompile html templates
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45
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46 """
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47 self.tracker_home = tracker_home
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48 self.optimize = optimize
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49 # if set, call schema_hook after executing schema.py will get
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50 # same variables (in particular db) as schema.py main purpose is
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51 # for regression tests
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52 self.schema_hook = None
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53 self.config = configuration.CoreConfig(tracker_home)
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54 self.actions = {}
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55 self.cgi_actions = {}
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56 self.templating_utils = {}
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57 self.load_interfaces()
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58 self.templates = templating.Templates(self.config["TEMPLATES"])
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59 self.backend = backends.get_backend(self.get_backend_name())
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60 if self.optimize:
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61 libdir = os.path.join(self.tracker_home, 'lib')
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62 if os.path.isdir(libdir):
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63 sys.path.insert(1, libdir)
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64 self.templates.precompileTemplates()
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65 # initialize tracker extensions
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66 for extension in self.get_extensions('extensions'):
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67 extension(self)
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68 # load database schema
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69 schemafilename = os.path.join(self.tracker_home, 'schema.py')
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70 # Note: can't use built-in open()
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71 # because of the global function with the same name
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72 schemafile = file(schemafilename, 'rt')
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73 self.schema = compile(schemafile.read(), schemafilename, 'exec')
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74 schemafile.close()
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75 # load database detectors
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76 self.detectors = self.get_extensions('detectors')
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77 # db_open is set to True after first open()
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78 self.db_open = 0
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79 if libdir in sys.path:
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80 sys.path.remove(libdir)
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81
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82 def get_backend_name(self):
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83 o = __builtins__['open']
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84 f = o(os.path.join(self.tracker_home, 'db', 'backend_name'))
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85 name = f.readline().strip()
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86 f.close()
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87 return name
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88
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89 def open(self, name=None):
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90 # load the database schema
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91 # we cannot skip this part even if self.optimize is set
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92 # because the schema has security settings that must be
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93 # applied to each database instance
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94 backend = self.backend
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95 vars = {
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96 'Class': backend.Class,
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97 'FileClass': backend.FileClass,
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98 'IssueClass': backend.IssueClass,
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99 'String': hyperdb.String,
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100 'Password': hyperdb.Password,
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101 'Date': hyperdb.Date,
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102 'Link': hyperdb.Link,
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103 'Multilink': hyperdb.Multilink,
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104 'Interval': hyperdb.Interval,
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105 'Boolean': hyperdb.Boolean,
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106 'Number': hyperdb.Number,
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107 'db': backend.Database(self.config, name)
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108 }
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109
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110 if self.optimize:
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111 # execute preloaded schema object
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112 exec(self.schema, vars)
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113 if callable (self.schema_hook):
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114 self.schema_hook(**vars)
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115 # use preloaded detectors
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116 detectors = self.detectors
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117 else:
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118 libdir = os.path.join(self.tracker_home, 'lib')
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119 if os.path.isdir(libdir):
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120 sys.path.insert(1, libdir)
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121 # execute the schema file
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122 self._load_python('schema.py', vars)
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123 if callable (self.schema_hook):
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124 self.schema_hook(**vars)
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125 # reload extensions and detectors
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126 for extension in self.get_extensions('extensions'):
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127 extension(self)
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128 detectors = self.get_extensions('detectors')
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129 if libdir in sys.path:
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130 sys.path.remove(libdir)
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131 db = vars['db']
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132 # apply the detectors
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133 for detector in detectors:
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134 detector(db)
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135 # if we are running in debug mode
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136 # or this is the first time the database is opened,
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137 # do database upgrade checks
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138 if not (self.optimize and self.db_open):
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139 # As a consistency check, ensure that every link property is
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140 # pointing at a defined class. Otherwise, the schema is
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141 # internally inconsistent. This is an important safety
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142 # measure as it protects against an accidental schema change
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143 # dropping a table while there are still links to the table;
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144 # once the table has been dropped, there is no way to get it
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145 # back, so it is important to drop it only if we are as sure
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146 # as possible that it is no longer needed.
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147 classes = db.getclasses()
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148 for classname in classes:
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149 cl = db.getclass(classname)
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150 for propname, prop in cl.getprops().iteritems():
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151 if not isinstance(prop, (hyperdb.Link,
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152 hyperdb.Multilink)):
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153 continue
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154 linkto = prop.classname
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155 if linkto not in classes:
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156 raise ValueError, \
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157 ("property %s.%s links to non-existent class %s"
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158 % (classname, propname, linkto))
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159
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160 db.post_init()
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161 self.db_open = 1
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162 return db
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163
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164 def load_interfaces(self):
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165 """load interfaces.py (if any), initialize Client and MailGW attrs"""
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166 vars = {}
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167 if os.path.isfile(os.path.join(self.tracker_home, 'interfaces.py')):
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168 self._load_python('interfaces.py', vars)
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169 self.Client = vars.get('Client', client.Client)
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170 self.MailGW = vars.get('MailGW', mailgw.MailGW)
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171
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172 def get_extensions(self, dirname):
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173 """Load python extensions
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174
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175 Parameters:
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176 dirname:
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177 extension directory name relative to tracker home
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178
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179 Return value:
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180 list of init() functions for each extension
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181
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182 """
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183 extensions = []
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184 dirpath = os.path.join(self.tracker_home, dirname)
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185 if os.path.isdir(dirpath):
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186 sys.path.insert(1, dirpath)
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187 for name in os.listdir(dirpath):
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188 if not name.endswith('.py'):
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189 continue
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190 vars = {}
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191 self._load_python(os.path.join(dirname, name), vars)
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192 extensions.append(vars['init'])
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193 sys.path.remove(dirpath)
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194 return extensions
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195
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196 def init(self, adminpw):
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197 db = self.open('admin')
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198 self._load_python('initial_data.py', {'db': db, 'adminpw': adminpw,
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199 'admin_email': self.config['ADMIN_EMAIL']})
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200 db.commit()
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201 db.close()
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202
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203 def exists(self):
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204 return self.backend.db_exists(self.config)
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205
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206 def nuke(self):
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207 self.backend.db_nuke(self.config)
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208
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209 def _load_python(self, file, vars):
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210 file = os.path.join(self.tracker_home, file)
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211 execfile(file, vars)
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212 return vars
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213
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214 def registerAction(self, name, action):
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215
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216 # The logic here is this:
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217 # * if `action` derives from actions.Action,
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218 # it is executable as a generic action.
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219 # * if, moreover, it also derives from cgi.actions.Bridge,
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220 # it may in addition be called via CGI
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221 # * in all other cases we register it as a CGI action, without
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222 # any check (for backward compatibility).
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223 if issubclass(action, actions.Action):
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224 self.actions[name] = action
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225 if issubclass(action, cgi_actions.Bridge):
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226 self.cgi_actions[name] = action
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227 else:
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228 self.cgi_actions[name] = action
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229
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230 def registerUtil(self, name, function):
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231 self.templating_utils[name] = function
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232
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233 class TrackerError(Exception):
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234 pass
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235
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236
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237 class OldStyleTrackers:
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238 def __init__(self):
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239 self.number = 0
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240 self.trackers = {}
204
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241
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242 def open(self, tracker_home, optimize=0):
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243 """Open the tracker.
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244
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245 Parameters:
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246 tracker_home:
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247 tracker home directory
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248 optimize:
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249 if set, precompile html templates
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250
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251 Raise ValueError if the tracker home doesn't exist.
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252
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253 """
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254 import imp
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255 # sanity check existence of tracker home
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256 if not os.path.exists(tracker_home):
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257 raise ValueError, 'no such directory: "%s"'%tracker_home
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258
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259 # sanity check tracker home contents
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260 for reqd in 'config dbinit select_db interfaces'.split():
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261 if not os.path.exists(os.path.join(tracker_home, '%s.py'%reqd)):
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262 raise TrackerError, 'File "%s.py" missing from tracker '\
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263 'home "%s"'%(reqd, tracker_home)
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264
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265 if self.trackers.has_key(tracker_home):
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266 return imp.load_package(self.trackers[tracker_home],
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267 tracker_home)
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268 # register all available backend modules
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269 backends.list_backends()
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270 self.number = self.number + 1
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271 modname = '_roundup_tracker_%s'%self.number
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272 self.trackers[tracker_home] = modname
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273
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274 # load the tracker
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275 tracker = imp.load_package(modname, tracker_home)
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276
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277 # ensure the tracker has all the required bits
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278 for required in 'open init Client MailGW'.split():
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279 if not hasattr(tracker, required):
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280 raise TrackerError, \
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281 'Required tracker attribute "%s" missing'%required
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282
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283 # load and apply the config
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284 tracker.config = configuration.CoreConfig(tracker_home)
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285 tracker.dbinit.config = tracker.config
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286
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287 tracker.optimize = optimize
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288 tracker.templates = templating.Templates(tracker.config["TEMPLATES"])
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289 if optimize:
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290 tracker.templates.precompileTemplates()
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291
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292 return tracker
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293
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294 OldStyleTrackers = OldStyleTrackers()
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295 def open(tracker_home, optimize=0):
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296 if os.path.exists(os.path.join(tracker_home, 'dbinit.py')):
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297 # user should upgrade...
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298 return OldStyleTrackers.open(tracker_home, optimize=optimize)
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299
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300 return Tracker(tracker_home, optimize=optimize)
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301
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302 # vim: set filetype=python sts=4 sw=4 et si :
Roundup Issue Tracker: http://roundup-tracker.org/