1
# IVLE - Informatics Virtual Learning Environment
2
# Copyright (C) 2007-2009 The University of Melbourne
4
# This program is free software; you can redistribute it and/or modify
5
# it under the terms of the GNU General Public License as published by
6
# the Free Software Foundation; either version 2 of the License, or
7
# (at your option) any later version.
9
# This program is distributed in the hope that it will be useful,
10
# but WITHOUT ANY WARRANTY; without even the implied warranty of
11
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12
# GNU General Public License for more details.
14
# You should have received a copy of the GNU General Public License
15
# along with this program; if not, write to the Free Software
16
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18
# Author: Matt Giuca, Will Grant
21
Provides programmatic access to the IVLE configuration file.
28
from configobj import ConfigObj
29
from validate import Validator
31
__all__ = ["ConfigError", "Config"]
33
class ConfigError(Exception):
35
An error reading or writing the configuration file.
41
Search for the config file, and return the directory it is in.
42
1. Environment var IVLECONF (path to directory)
44
Raises a ConfigError on error.
46
if 'IVLECONF' in os.environ:
47
fname = os.path.join(os.environ['IVLECONF'])
48
if os.path.exists(fname):
50
if os.path.exists('/etc/ivle'):
52
raise ConfigError("Could not find IVLE config directory")
54
def get_plugin(pluginstr):
55
plugin_path, classname = pluginstr.split('#')
56
# Load the plugin module from somewhere in the Python path
57
# (Note that plugin_path is a fully-qualified Python module name).
59
getattr(__import__(plugin_path, fromlist=[classname]), classname))
62
class Config(ConfigObj):
64
The configuration object. Can be instantiated with no arguments (will
65
implicitly find the ivle.conf file and load it).
67
Automatically validates the file against the spec (found in
68
./ivle-spec.conf relative to this module).
70
def __init__(self, blank=False, plugins=True, *args, **kwargs):
71
"""Initialises a new Config object. Searches for the config file,
72
loads it, and validates it.
73
@param blank: If blank=True, will create a blank config instead, and
74
not search for the config file.
75
@param plugins: If True, will find and index plugins.
76
@raise ConfigError: If the config file cannot be found.
78
specfile = os.path.join(os.path.dirname(__file__), 'ivle-spec.conf')
80
super(Config, self).__init__(configspec=specfile, *args, **kwargs)
82
confdir = search_confdir()
83
conffile = os.path.join(confdir, 'ivle.conf')
84
super(Config, self).__init__(infile=conffile, configspec=specfile,
85
interpolation='template',
87
# XXX This doesn't raise errors if it doesn't validate
88
self.validate(Validator())
93
self.plugin_configs = {}
94
# Go through the plugin config files, looking for plugins.
95
for pconfn in glob.glob(os.path.join(confdir, 'plugins.d/*.conf')):
96
pconf = ConfigObj(pconfn)
97
for plugin_section in pconf:
98
# We have a plugin path. Resolve it into a class...
99
plugin_path, plugin = get_plugin(plugin_section)
100
self.plugins[plugin_path] = plugin
101
# ... and add it to the registry.
102
self.plugin_configs[plugin] = pconf[plugin_section]
104
# Create a registry mapping plugin classes to paths.
105
self.reverse_plugins = dict([(v, k) for (k, v) in
106
self.plugins.items()])
108
# Create an index of plugins by base class.
109
self.plugin_index = {}
110
for plugin in self.plugins.values():
111
# Getmro returns a tuple of all the super-classes of the plugin
112
for base in inspect.getmro(plugin):
113
if base not in self.plugin_index:
114
self.plugin_index[base] = []
115
self.plugin_index[base].append(plugin)
117
def set_by_path(self, path, value=_NO_VALUE, comment=None):
118
"""Writes a value to an option, given a '/'-separated path.
119
@param path: '/'-separated path to configuration option.
120
@param value: Optional - value to write to the option.
121
@param comment: Optional - comment string (lines separated by '\n's).
122
Note: If only a comment is being inserted, and the value does not
123
exist, fails silently.
125
path = path.split('/')
126
# Iterate over each segment of the path, and find the section in conf
127
# file to insert the value into (use all but the last path segment)
129
for seg in path[:-1]:
130
# Create the section if it isn't there
131
if seg not in conf_section:
132
conf_section[seg] = {}
133
conf_section = conf_section[seg]
134
# The final path segment names the key to insert into
136
if value is not _NO_VALUE:
137
conf_section[keyname] = value
138
if comment is not None:
140
conf_section[keyname]
144
conf_section.comments[keyname] = comment.split('\n')
146
def get_by_path(self, path):
147
"""Gets an option's value, given a '/'-separated path.
148
@param path: '/'-separated path to configuration option.
149
@raise KeyError: if no config option is at that path.
151
# Iterate over each segment of the path, and find the value in conf file
153
for seg in path.split('/'):
154
value = value[seg] # May raise KeyError
added
removed
ivle/config/__init__.py
