configstacker 0.2.0

Aggregates multiple configuration sources into one configuration object with dot-notation or dictionary-like access.

What is configstacker?

Configstacker is a python library with the goal to simplify configuration handling as much as possible. You can read configurations from different sources (e.g. files, environment variables and others) and load single or merge multiple sources at will. The resulting configuration object can be used like a dictionary or with dot-notation. If you need additional flexibility configstacker also allows you to specify converters for values or merging strategies for keys that occur multiple times throughout different sources. If this is still not sufficient enough configstacker makes it very easy for you to add additional source handlers.

#
# Single Source Example
#
from configstacker import YAMLFile

config = YAMLFile('/path/to/my/config.yml')

# Dot-notation access
assert config.a_key is True

# Mixed dictionary and dot-notation access
assert config['subsection'].nested_key == 100

# Dictionary-like interface
assert config.keys() == ['a_key', 'subsection']

# Dictionary dumping on any level
assert config.dump() == {'a_key': True, 'subsection': {'nested_key': 100}}
assert config.subsection.dump() == {'nested_key': 100}

# New value assignment
config.new_value = 10.0
assert config.new_value == 10.0

#
# Multi Source Example
#
import configstacker as cs

# The resulting configuration object behaves
# the same as a single source one.
config = cs.StackedConfig(
    # The order of sources defines their search priority whereas the
    # last element has the highest one.
    cs.Environment(prefix='MYAPP'),
    cs.YAMLFile('/path/to/my/config.yml')
)

# Higher priority values shadow lower priority values.
assert config.a_key is False

# Lower prioritized values which are not shadowed stay accessible.
assert config['subsection'].nested_key == 100

# New values will be added to the source that has the highest
# priority and is writable.
config.other_new_value = True
assert config.other_new_value is True

# In this case the new item was added to the last element in the
# source list.
assert config.source_list[-1].other_new_value

Examples for type conversion and merging strategies can be found in the documentation.

Latest Version and History

Configstacker adheres to Semantic Versioning.

The current version is 0.2.0 which means configstacker is still in a planning phase. As such it is not meant for production use. That said it is already very stable and should hit its first major version soon.

Changes can be found in CHANGELOG.

Installation

Configstacker can be installed with pip and only requires six for the minimal installation.

pip install configstacker

However, some of the source handlers require additional packages when in use.

• YAMLFile requires pyyaml

You can use the following syntax to install all optional dependencies. Leave out those from the brackets you do not need.

pip install configstacker[yaml]

Note

New source handlers with additional dependencies might be added over time.

Documentation

Configstacker provides a user documentation on readthedocs.org.

Licensing

Please see LICENSE.

Contribution

Contributions are very welcome. The main development happens on gitlab. For reporting issues you can also use github.