derpconf abstracts loading configuration files for your app. derpconf was extracted from thumbor.
Installing derpconf is as easy as:
pip install derpconf
Using it is as simple as:
from derpconf.config import Config
conf = Config.load('/path/to/my/cfg.conf')
assert conf.MY_KEY == 'MY_VALUE' # assuming there's a key called MY_KEY in
# the configuration file.If you want to set default values for your configurations, just call:
Config.define('MY-KEY', 'DEFAULT VALUE', 'Description for my key', 'Section')The values that define gets are:
- the configuration key;
- the default value for that key if it's not found in the configuration file;
- the description for this key. This is very useful for generating configuration file examples.
- the section that this key belongs to. Again very useful for generating configuration file examples.
If you wish to allow environment variables to be used as the value of
configuration keys, just call the allow_environment_variables method in your
config.py file:
from derpconf.config import Config
Config.allow_environment_variables()If there's an environment variable with the same name as the given configuration, derpconf will give precedence to it, instead of using the default value or the value in the configuration file.
# called program with SOMETHING=value myprogram.py
assert config.SOMETHING == "value"
# even if the default for 'SOMETHING' or the value in the config file is different from 'value'After you've loaded configurations from a file, sometimes it's needed to have them reloaded. This is the case when a new module needs to define some new default values.
In order to reload values from a config object, just call reload on it:
from derpconf.config import Config
conf = Config.load('/path/to/my/cfg.conf')
# then later on...
Config.define('SOMENEWFOO', 'bar', 'baz', 'foo')
conf.reload()
assert conf.SOMENEWFOO == 'bar'To generate a configuration example, you just need to call the
get_config_text method. Let's see an example:
from derpconf.config import Config
Config.define('foo', 'fooval', 'Foo is always a foo', 'FooValues')
Config.define('bar', 'barval', 'Bar is not always a bar', 'BarValues')
Config.define('baz', 'bazval', 'Baz is never a bar', 'BarValues')
config_sample = Config.get_config_text()
print config_sample # or instead of both, just call generate_config()The following text will be print into the standard output:
################################## FooValues ###################################
## Foo is always a foo
## Defaults to: fooval
#foo = 'fooval'
################################################################################
################################## BarValues ###################################
## Bar is not always a bar
## Defaults to: barval
#bar = 'barval'
## Baz is never a bar
## Defaults to: bazval
#baz = 'bazval'
################################################################################A good sample of using derpconf can be seen at thumbor's configuration file.
derpconf includes a configuration file verifier. The purpose of this verifier is to help you quickly understand what configuration files are missing what keys and what values will be used for them instead.
Running it is as simple as including a call to verify_config in your
config.py file:
verify_config(file_path)Or you can leave it blank and derpconf will get the file path from sys.argv:
verify_config()The output of the verifier is something like this:
Configuration "baz" not found in file /Users/bernardo/dev/derpconf/vows/fixtures/missing.conf. Using "bazval" instead.
Configuration "foo" not found in file /Users/bernardo/dev/derpconf/vows/fixtures/missing.conf. Using "fooval" instead.
Configuration "bar" not found in file /Users/bernardo/dev/derpconf/vows/fixtures/missing.conf. Using "barval" instead.You can see it in use at derpconf's code.
derpconf is licensed under the MIT License:
The MIT License
Copyright (c) 2012 globo.com [email protected]
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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