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annotate roundup/instance.py @ 4764:d273e59b487b

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roundup.demo: Use relative tracker home directory Introduced in commit a0654b1283a4 when it was not known that source demo.py is copied to roundup.demo during the build phase. demo.py migrated to roundup.demo in the previous commit.
author anatoly techtonik <techtonik@gmail.com>
date Thu, 21 Feb 2013 19:08:40 +0300
parents e339583eae8e
children 6e9b9743de89
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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 Tracker:
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39 def __init__(self, tracker_home, optimize=0):
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40 """New-style tracker instance constructor
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41
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42 Parameters:
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43 tracker_home:
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44 tracker home directory
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45 optimize:
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46 if set, precompile html templates
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47
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48 """
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49 self.tracker_home = tracker_home
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50 self.optimize = optimize
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51 # if set, call schema_hook after executing schema.py will get
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52 # same variables (in particular db) as schema.py main purpose is
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53 # for regression tests
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54 self.schema_hook = None
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55 self.config = configuration.CoreConfig(tracker_home)
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56 self.actions = {}
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57 self.cgi_actions = {}
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58 self.templating_utils = {}
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60 libdir = os.path.join(self.tracker_home, 'lib')
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61 self.libdir = os.path.isdir(libdir) and libdir or ''
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62
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63 self.load_interfaces()
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64 self.templates = templating.get_loader(self.config["TEMPLATES"],
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65 self.config["TEMPLATE_ENGINE"])
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66 self.backend = backends.get_backend(self.get_backend_name())
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67
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68 if self.optimize:
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69 self.templates.precompile()
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70 # initialize tracker extensions
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71 for extension in self.get_extensions('extensions'):
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72 extension(self)
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73 # load database schema
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74 self.schema = self._compile('schema.py')
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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
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80 def get_backend_name(self):
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81 f = file(os.path.join(self.config.DATABASE, 'backend_name'))
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82 name = f.readline().strip()
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83 f.close()
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84 return name
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85
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86 def open(self, name=None):
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87 # load the database schema
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88 # we cannot skip this part even if self.optimize is set
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89 # because the schema has security settings that must be
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90 # applied to each database instance
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91 backend = self.backend
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92 env = {
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93 'Class': backend.Class,
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94 'FileClass': backend.FileClass,
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95 'IssueClass': backend.IssueClass,
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96 'String': hyperdb.String,
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97 'Password': hyperdb.Password,
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98 'Date': hyperdb.Date,
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99 'Link': hyperdb.Link,
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100 'Multilink': hyperdb.Multilink,
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101 'Interval': hyperdb.Interval,
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102 'Boolean': hyperdb.Boolean,
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103 'Number': hyperdb.Number,
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104 'db': backend.Database(self.config, name)
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105 }
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106
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107 if self.optimize:
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108 # execute preloaded schema object
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109 self._exec(self.schema, env)
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110 if callable (self.schema_hook):
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111 self.schema_hook(**env)
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112 # use preloaded detectors
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113 detectors = self.detectors
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114 else:
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115 # execute the schema file
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116 self._execfile('schema.py', env)
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117 if callable (self.schema_hook):
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118 self.schema_hook(**env)
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119 # reload extensions and detectors
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120 for extension in self.get_extensions('extensions'):
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121 extension(self)
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122 detectors = self.get_extensions('detectors')
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123 db = env['db']
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124 # apply the detectors
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125 for detector in detectors:
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126 detector(db)
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127 # if we are running in debug mode
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128 # or this is the first time the database is opened,
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129 # do database upgrade checks
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130 if not (self.optimize and self.db_open):
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131 # As a consistency check, ensure that every link property is
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132 # pointing at a defined class. Otherwise, the schema is
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133 # internally inconsistent. This is an important safety
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134 # measure as it protects against an accidental schema change
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135 # dropping a table while there are still links to the table;
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136 # once the table has been dropped, there is no way to get it
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137 # back, so it is important to drop it only if we are as sure
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138 # as possible that it is no longer needed.
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139 classes = db.getclasses()
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140 for classname in classes:
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141 cl = db.getclass(classname)
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142 for propname, prop in cl.getprops().iteritems():
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143 if not isinstance(prop, (hyperdb.Link,
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144 hyperdb.Multilink)):
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145 continue
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146 linkto = prop.classname
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147 if linkto not in classes:
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148 raise ValueError, \
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149 ("property %s.%s links to non-existent class %s"
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150 % (classname, propname, linkto))
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151
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152 db.post_init()
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153 self.db_open = 1
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154 return db
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155
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156 def load_interfaces(self):
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157 """load interfaces.py (if any), initialize Client and MailGW attrs"""
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158 env = {}
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159 if os.path.isfile(os.path.join(self.tracker_home, 'interfaces.py')):
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160 self._execfile('interfaces.py', env)
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161 self.Client = env.get('Client', client.Client)
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162 self.MailGW = env.get('MailGW', mailgw.MailGW)
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163 self.TemplatingUtils = env.get('TemplatingUtils', templating.TemplatingUtils)
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164
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165 def get_extensions(self, dirname):
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166 """Load python extensions
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167
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168 Parameters:
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169 dirname:
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170 extension directory name relative to tracker home
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171
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172 Return value:
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173 list of init() functions for each extension
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174
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175 """
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176 extensions = []
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177 dirpath = os.path.join(self.tracker_home, dirname)
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178 if os.path.isdir(dirpath):
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179 sys.path.insert(1, dirpath)
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180 for name in os.listdir(dirpath):
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181 if not name.endswith('.py'):
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182 continue
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183 env = {}
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184 self._execfile(os.path.join(dirname, name), env)
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185 extensions.append(env['init'])
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186 sys.path.remove(dirpath)
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187 return extensions
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188
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189 def init(self, adminpw):
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190 db = self.open('admin')
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191 self._execfile('initial_data.py', {'db': db, 'adminpw': adminpw,
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192 'admin_email': self.config['ADMIN_EMAIL']})
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193 db.commit()
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194 db.close()
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195
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196 def exists(self):
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197 return self.backend.db_exists(self.config)
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198
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199 def nuke(self):
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200 self.backend.db_nuke(self.config)
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201
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202 def _compile(self, fname):
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203 fname = os.path.join(self.tracker_home, fname)
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204 return compile(file(fname).read(), fname, 'exec')
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205
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206 def _exec(self, obj, env):
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207 if self.libdir:
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208 sys.path.insert(1, self.libdir)
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209 exec(obj, env)
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210 if self.libdir:
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211 sys.path.remove(self.libdir)
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212 return env
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213
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214 def _execfile(self, fname, env):
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215 self._exec(self._compile(fname), env)
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216
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217 def registerAction(self, name, action):
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218
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219 # The logic here is this:
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220 # * if `action` derives from actions.Action,
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221 # it is executable as a generic action.
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222 # * if, moreover, it also derives from cgi.actions.Bridge,
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223 # it may in addition be called via CGI
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224 # * in all other cases we register it as a CGI action, without
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225 # any check (for backward compatibility).
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226 if issubclass(action, actions.Action):
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227 self.actions[name] = action
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228 if issubclass(action, cgi_actions.Bridge):
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229 self.cgi_actions[name] = action
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230 else:
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231 self.cgi_actions[name] = action
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232
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233 def registerUtil(self, name, function):
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234 self.templating_utils[name] = function
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235
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236 class TrackerError(Exception):
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237 pass
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238
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239
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240 class OldStyleTrackers:
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241 def __init__(self):
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242 self.number = 0
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243 self.trackers = {}
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244
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245 def open(self, tracker_home, optimize=0):
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246 """Open the tracker.
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247
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248 Parameters:
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249 tracker_home:
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250 tracker home directory
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251 optimize:
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252 if set, precompile html templates
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253
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254 Raise ValueError if the tracker home doesn't exist.
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255
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256 """
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257 import imp
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258 # sanity check existence of tracker home
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259 if not os.path.exists(tracker_home):
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260 raise ValueError, 'no such directory: "%s"'%tracker_home
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261
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262 # sanity check tracker home contents
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263 for reqd in 'config dbinit select_db interfaces'.split():
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264 if not os.path.exists(os.path.join(tracker_home, '%s.py'%reqd)):
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265 raise TrackerError, 'File "%s.py" missing from tracker '\
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266 'home "%s"'%(reqd, tracker_home)
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267
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268 if self.trackers.has_key(tracker_home):
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269 return imp.load_package(self.trackers[tracker_home],
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270 tracker_home)
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271 # register all available backend modules
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272 backends.list_backends()
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273 self.number = self.number + 1
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274 modname = '_roundup_tracker_%s'%self.number
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275 self.trackers[tracker_home] = modname
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276
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277 # load the tracker
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278 tracker = imp.load_package(modname, tracker_home)
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279
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280 # ensure the tracker has all the required bits
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281 for required in 'open init Client MailGW'.split():
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282 if not hasattr(tracker, required):
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283 raise TrackerError, \
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284 'Required tracker attribute "%s" missing'%required
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285
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286 # load and apply the config
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287 tracker.config = configuration.CoreConfig(tracker_home)
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288 tracker.dbinit.config = tracker.config
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289
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290 tracker.optimize = optimize
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291 tracker.templates = templating.get_loader(tracker.config["TEMPLATES"])
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292 if optimize:
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293 tracker.templates.precompile()
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294
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295 return tracker
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296
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297 OldStyleTrackers = OldStyleTrackers()
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298 def open(tracker_home, optimize=0):
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299 if os.path.exists(os.path.join(tracker_home, 'dbinit.py')):
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300 # user should upgrade...
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301 return OldStyleTrackers.open(tracker_home, optimize=optimize)
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302
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303 return Tracker(tracker_home, optimize=optimize)
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304
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305 # vim: set filetype=python sts=4 sw=4 et si :
Roundup Issue Tracker: http://roundup-tracker.org/