Hierarchical Yaml Python Config
Project description
HiYaPyCo - A Hierarchical Yaml Python Config
Description
A simple python lib allowing hierarchical overlay of config files in YAML syntax, offering different merge methods and variable interpolation based on jinja2.
The goal was to have something similar to puppets hiera deeper merge_behavior for python.
Key Features
hierarchical overlay of multiple YAML files
multiple merge methods for hierarchical YAML files
variable interpolation using jinja2
Requirements
PyYAML aka. python-yaml
Jinja2 aka. python-jinja2
ordereddict for python2.6 (if you like to use the Ordered Dict Yaml Loader / Dumper aka. ODYLDo)
Python Version
HiYaPyCo was designed to run on both current major python versions without changes. Tested versions:
2.6
2.7
3.2
3.4
Usage
A simple example:
import hiyapyco conf = hiyapyco.load('yamlfile1' [,'yamlfile2' [,'yamlfile3' [...]]] [,kwargs]) print(hiyapyco.dump(conf))
real life example:
yaml1.yaml:
--- first: first element second: xxx deep: k1: - 1 - 2
yaml2.yaml:
--- second: again {{ first }} deep: k1: - 4 - 6 k2: - 3 - 6
load …
>>> import pprint >>> import hiyapyco >>> conf = hiyapyco.load('yaml1.yaml', 'yaml2.yaml', method=hiyapyco.METHOD_MERGE, interpolate=True, failonmissingfiles=True) >>> pprint.PrettyPrinter(indent=4).pprint(conf) { 'deep': { 'k1': [1, 2, 4, 6], 'k2': [3, 6]}, 'first': u'first element', 'ma': { 'ones': u'12', 'sum': u'22'}, 'second': u'again first element'}
real life example using yaml documents as strings
>>> import hiyapyco >>> y1=""" ... yaml: 1 ... y: ... y1: abc ... y2: xyz ... """ >>> y2=""" ... yaml: 2 ... y: ... y2: def ... y3: XYZ ... """ >>> conf = hiyapyco.load([y1, y2], method=hiyapyco.METHOD_MERGE) >>> print (conf) OrderedDict([('yaml', 2), ('y', OrderedDict([('y1', 'abc'), ('y2', 'def'), ('y3', 'XYZ')]))]) >>> hiyapyco.dump(conf, default_flow_style=True) '{yaml: 2, y: {y1: abc, y2: def, y3: XYZ}}\n'
args
All args are handled as file names or yaml documents. They may be strings or list of strings.
kwargs
method: bit (one of the listed below):
hiyapyco.METHOD_SIMPLE: replace values (except for lists a simple merge is performed) (default method)
hiyapyco.METHOD_MERGE: perform a deep merge
interpolate: boolean : perform interpolation after the merge (default: False)
castinterpolated: boolean : try to perform a best possible match cast for interpolated strings
usedefaultyamlloader: boolean : force the usage of the default PyYAML loader/dumper instead of HiYaPyCos implementation of a OrderedDict loader/dumper (see: Ordered Dict Yaml Loader / Dumper aka. ODYLDo) (default: False)
failonmissingfiles: boolean : fail if a supplied YAML file can not be found (default: True)
loglevel: int : loglevel for the hiyapyco logger; should be one of the valid levels from logging: ‘WARN’, ‘ERROR’, ‘DEBUG’, ‘I NFO’, ‘WARNING’, ‘CRITICAL’, ‘NOTSET’ (default: default of logging)
loglevelmissingfiles: int : one of the valid levels from logging: ‘WARN’, ‘ERROR’, ‘DEBUG’, ‘INFO’, ‘WARNING’, ‘CRITICAL’, ‘NOTSET’ (default: logging.ERROR if failonmissingfiles = True, else logging.WARN)
interpolation
For using interpolation, I strongly recomend not to use the default PyYAML loader, as it sorts the dict entrys alphabetically, a fact that may break interpolation in some cases (see test/odict.yaml and test/test_odict.py for an example). See Ordered Dict Yaml Loader / Dumper aka. ODYLDo
default
The default jinja2.Environment for the interpolation is
hiyapyco.jinja2env = Environment(undefined=Undefined)
This means that undefined vars will be ignored and replaced with a empty string.
change the jinja2 Environment
If you like to change the jinja2 Environment used for the interpolation, set hiyapyco.jinja2env before calling hiyapyco.load!
use jinja2 DebugUndefined
If you like to keep the undefined var as string but raise no error, use
from jinja2 import Environment, Undefined, DebugUndefined, StrictUndefined hiyapyco.jinja2env = Environment(undefined=DebugUndefined)
use jinja2 StrictUndefined
If you like to raise a error on undefined vars, use
from jinja2 import Environment, Undefined, DebugUndefined, StrictUndefined hiyapyco.jinja2env = Environment(undefined=StrictUndefined)
This will raise a hiyapyco.HiYaPyCoImplementationException wrapped arround the jinja2.UndefinedError pointing at the string causing the error.
more informations
See: jinja2.Environment
cast interpolated strings
As you must use interpolation as strings (PyYAML will weep if you try to start a value with {{), you can set castinterpolated to True in order to try to get a best match cast for the interpolated values. The ``best match`` cast is currently only a q&d implementation and may not give you the expected results!
Ordered Dict Yaml Loader / Dumper aka. ODYLDo
This is a simple implementation of a PyYAML loader / dumper using OrderedDict from collections. Because chaos is fun but order matters on loading dicts from a yaml file. In order to use this on python 2.6, please install ordereddict:
sudo pip-2.6 install ordereddict
Install
From Source
GitHub
https://github.com/zerwes/hiyapyco
git clone https://github.com/zerwes/hiyapyco cd hiyapyco sudo python setup.py install
PyPi
Download the latest or desired version of the source package from https://pypi.python.org/pypi/HiYaPyCo. Unpack the archive and install by executing:
sudo python setup.py install
pip
Install the latest wheel package using:
pip install HiYaPyCo
debian packages
echo "deb http://repo.zero-sys.net/hiyapyco/deb ./" > /etc/apt/sources.list.d/hiyapyco.list gpg --keyserver keys.gnupg.net --recv-key ED7D414C # or use: wget http://jwhoisserver.net/key.asc -O - | gpg --import - gpg --armor --export ED7D414C | apt-key add - apt-get update apt-get install python3-hiyapyco python-hiyapyco
rpm packages
use http://repo.zero-sys.net/hiyapyco/rpm as URL for the yum repo and http://jwhoisserver.net/key.asc as the URL for the key.
License
2014 - 2015 Klaus Zerwes zero-sys.net
This package is free software. This software is licensed under the terms of the GNU GENERAL PUBLIC LICENSE version 3 or later, as published by the Free Software Foundation. See https://www.gnu.org/licenses/gpl.html
Changelog
0.4.3
FIXED: issue #6 import of hiyapyco **version* in setup.py causes pip install failures*
0.4.2
Changed: moved to GPL
Improvements: missing files handling, doc
0.4.1
Implemented: castinterpolated
0.4.0
Implemented: loading yaml docs from string
0.3.2
Improved tests and bool args checks
0.3.0 / 0.3.1
Implemented a Ordered Dict Yaml Loader
0.2.0
Fixed unicode handling
0.1.0 / 0.1.1
Initial release
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