Mercurial > p > roundup > code

annotate roundup/instance.py @ 4740:fe9568a6cbd6

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Untangle template selection logic from template loading functionality.
author anatoly techtonik <techtonik@gmail.com>
date Tue, 15 Jan 2013 00:10:01 +0300
parents f7e68ae4926c
children e339583eae8e
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
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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.precompileTemplates()
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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.precompileTemplates()
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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/