Skip to main content

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 merge_behavior: deeper 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

! GPG key changed !

echo "deb http://repo.zero-sys.net/hiyapyco/deb ./" > /etc/apt/sources.list.d/hiyapyco.list
gpg --keyserver keys.gnupg.net --recv-key 77DE7FB4
# or use:
wget https://repo.zero-sys.net/77DE7FB4.asc -O - | gpg --import -
gpg --armor --export 77DE7FB4 | apt-key add -
apt-get update
apt-get install python3-hiyapyco python-hiyapyco

rpm packages

! GPG key changed !

use http://repo.zero-sys.net/hiyapyco/rpm as URL for the yum repo and https://repo.zero-sys.net/77DE7FB4.asc as the URL for the key.

Arch Linux

An AUR package is available.

License

Copyright © 2014 - 2017 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

0.4.10

FIXED: issue #24 repo signing

0.4.9

FIXED: issue #23 loglevelonmissingfiles

0.4.8

Fixed pypi doc

0.4.7

Reverted: logger settings to initial state

Improved: dump

Merged:

0.4.6

MERGED: fixes from mmariani

0.4.5

FIXED: issues #9 and #11

0.4.4

deb packages:

  • removed support for python 2.6

  • include examples as doc

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

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

HiYaPyCo-0.4.10.tar.gz (30.7 kB view details)

Uploaded Source

Built Distribution

HiYaPyCo-0.4.10-py2.py3-none-any.whl (14.1 kB view details)

Uploaded Python 2 Python 3

File details

Details for the file HiYaPyCo-0.4.10.tar.gz.

File metadata

  • Download URL: HiYaPyCo-0.4.10.tar.gz
  • Upload date:
  • Size: 30.7 kB
  • Tags: Source
  • Uploaded using Trusted Publishing? No

File hashes

Hashes for HiYaPyCo-0.4.10.tar.gz
Algorithm Hash digest
SHA256 fb5420eed74cd66e96f43534f07d85aff129b4e90efca4ab42858565202c2b45
MD5 3434deec0ff382eccaa60f58573ba347
BLAKE2b-256 9660cb952f353bc5d14f9b481b4d273e97272bd94e9c2d3add0182bffb2e86a7

See more details on using hashes here.

File details

Details for the file HiYaPyCo-0.4.10-py2.py3-none-any.whl.

File metadata

File hashes

Hashes for HiYaPyCo-0.4.10-py2.py3-none-any.whl
Algorithm Hash digest
SHA256 52ed227eef3dd29c4f3e4be3d6f9221d455e07874f75e088f36f04f1bffb2a17
MD5 f4e615c0de4462cbbe0a8390d0e33ac0
BLAKE2b-256 0d174e0edf11dce30b213d0492e84c3aa2c5e536bd3cd069d1475667c227defc

See more details on using hashes here.

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page