mirror of
https://github.com/valitydev/salt.git
synced 2024-11-07 08:58:59 +00:00
168 lines
4.6 KiB
ReStructuredText
168 lines
4.6 KiB
ReStructuredText
=================
|
|
Salt Coding Style
|
|
=================
|
|
|
|
Salt is developed with a certain coding style, while the style is dominantly
|
|
PEP-08 it is not completely PEP-08. It is also noteworthy that a few
|
|
development techniques are also employed which should be adhered to. In the
|
|
end, the code is made to be "Salty".
|
|
|
|
Most importantly though, we will accept code that violates the coding style and
|
|
KINDLY ask the contributor to fix it, or go ahead and fix the code on behalf of
|
|
the contributor. Coding style is NEVER grounds to reject code contributions,
|
|
and is never grounds to talk down to another member of the community (There are
|
|
no grounds to treat others without respect, especially people working to
|
|
improve Salt)!!
|
|
|
|
|
|
Strings
|
|
=======
|
|
|
|
Salt follows a few rules when formatting strings:
|
|
|
|
Single Quotes
|
|
-------------
|
|
|
|
In Salt, all strings use single quotes unless there is a good reason not to.
|
|
This means that docstrings use single quotes, standard strings use single
|
|
quotes etc.:
|
|
|
|
.. code-block:: python
|
|
|
|
def foo():
|
|
'''
|
|
A function that does things
|
|
'''
|
|
name = 'A name'
|
|
return name
|
|
|
|
Formatting Strings
|
|
------------------
|
|
|
|
All strings which require formatting should use the `.format` string method:
|
|
|
|
.. code-block:: python
|
|
|
|
data = 'some text'
|
|
more = '{0} and then some'.format(data)
|
|
|
|
Make sure to use indices or identifiers in the format brackets, since empty
|
|
brackets are not supported by python 2.6.
|
|
|
|
Please do NOT use printf formatting.
|
|
|
|
Docstring Conventions
|
|
---------------------
|
|
|
|
Docstrings should always add a newline, docutils takes care of the new line and
|
|
it makes the code cleaner and more vertical:
|
|
|
|
`GOOD`:
|
|
|
|
.. code-block:: python
|
|
|
|
def bar():
|
|
'''
|
|
Here lies a docstring with a newline after the quotes and is the salty
|
|
way to handle it! Vertical code is the way to go!
|
|
'''
|
|
return
|
|
|
|
`BAD`:
|
|
|
|
.. code-block:: python
|
|
|
|
def baz():
|
|
'''This is not ok!'''
|
|
return
|
|
|
|
Imports
|
|
=======
|
|
|
|
Salt code prefers importing modules and not explicit functions. This is both a
|
|
style and functional preference. The functional preference originates around
|
|
the fact that the module import system used by pluggable modules will include
|
|
callable objects (functions) that exist in the direct module namespace. This
|
|
is not only messy, but may unintentionally expose code python libs to the Salt
|
|
interface and pose a security problem.
|
|
|
|
To say this more directly with an example, this is `GOOD`:
|
|
|
|
.. code-block:: python
|
|
|
|
import os
|
|
|
|
def minion_path():
|
|
path = os.path.join(self.opts['cachedir'], 'minions')
|
|
return path
|
|
|
|
This on the other hand is `DISCOURAGED`:
|
|
|
|
.. code-block:: python
|
|
|
|
from os.path import join
|
|
|
|
def minion_path():
|
|
path = join(self.opts['cachedir'], 'minions')
|
|
return path
|
|
|
|
The time when this is changed is for importing exceptions, generally directly
|
|
importing exceptions is preferred:
|
|
|
|
This is a good way to import exceptions:
|
|
|
|
.. code-block:: python
|
|
|
|
from salt.exceptions import CommandExecutionError
|
|
|
|
Vertical is Better
|
|
==================
|
|
|
|
When writing Salt code, vertical code is generally preferred. This is not a hard
|
|
rule but more of a guideline. As PEP-08 specifies Salt code should not exceed 79
|
|
characters on a line, but it is preferred to separate code out into more
|
|
newlines in some cases for better readability:
|
|
|
|
.. code-block:: python
|
|
|
|
import os
|
|
|
|
os.chmod(
|
|
os.path.join(self.opts['sock_dir'],
|
|
'minion_event_pub.ipc'),
|
|
448
|
|
)
|
|
|
|
Where there are more line breaks, this is also apparent when constructing a
|
|
function with many arguments, something very common in state functions for
|
|
instance:
|
|
|
|
.. code-block:: python
|
|
|
|
def managed(name,
|
|
source=None,
|
|
source_hash='',
|
|
user=None,
|
|
group=None,
|
|
mode=None,
|
|
template=None,
|
|
makedirs=False,
|
|
context=None,
|
|
replace=True,
|
|
defaults=None,
|
|
env=None,
|
|
backup='',
|
|
**kwargs):
|
|
|
|
Code Churn
|
|
==========
|
|
|
|
Many pull requests have been submitted that only churn code in the name of
|
|
PEP-08. Code churn is a leading source of bugs and is strongly discouraged.
|
|
While style fixes are encouraged they should be isolated to a single file per
|
|
commit, and the changes should be legitimate, if there are any questions about
|
|
whether a style change is legitimate please reference this document and the
|
|
official PEP-08 (http://www.python.org/dev/peps/pep-0008/) document before
|
|
changing code. Many claims that a change is PEP-08 have been invalid, please
|
|
double check before committing fixes.
|