Cleanup and make HACKING.rst DRYer
Reference the OpenStack hacking guide in HACKING.rst and remove duplicate entries. Add placeholder section for heat specific rules. heat specific rules can be created using hacking's local check support. Change-Id: Ib6967ae769bd73857abb7ef89368c407c8b22053
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Joe Gordon
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HACKING.rst
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HACKING.rst
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Heat Style Commandments
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=======================
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- Step 1: Read http://www.python.org/dev/peps/pep-0008/
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- Step 2: Read http://www.python.org/dev/peps/pep-0008/ again
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- Step 3: Read on
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- Step 1: Read the OpenStack Style Commandments
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https://github.com/openstack-dev/hacking/blob/master/HACKING.rst
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- Step 2: Read on
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Heat Specific Commandments
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--------------------------
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General
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-------
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- Put two newlines between top-level code (funcs, classes, etc)
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- Use only UNIX style newlines ("\n"), not Windows style ("\r\n")
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- Put one newline between methods in classes and anywhere else
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- Long lines should be wrapped in parentheses
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in preference to using a backslash for line continuation.
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- Do not write "except:", use "except Exception:" at the very least
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- Include your name with TODOs as in "#TODO(termie)"
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- Do not shadow a built-in or reserved word. Example::
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def list():
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return [1, 2, 3]
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mylist = list() # BAD, shadows `list` built-in
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class Foo(object):
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def list(self):
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return [1, 2, 3]
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mylist = Foo().list() # OKAY, does not shadow built-in
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- Use the "is not" operator when testing for unequal identities. Example::
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if not X is Y: # BAD, intended behavior is ambiguous
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pass
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if X is not Y: # OKAY, intuitive
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pass
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- Use the "not in" operator for evaluating membership in a collection. Example::
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if not X in Y: # BAD, intended behavior is ambiguous
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pass
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if X not in Y: # OKAY, intuitive
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pass
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if not (X in Y or X in Z): # OKAY, still better than all those 'not's
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pass
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Imports
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-------
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- Do not import objects, only modules (*)
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- Do not import more than one module per line (*)
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- Do not use wildcard ``*`` import (*)
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- Do not make relative imports
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- Order your imports by the full module path
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- Organize your imports according to the following template
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(*) exceptions are:
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- imports from ``migrate`` package
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- imports from ``sqlalchemy`` package
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- imports from ``heat.db.sqlalchemy.session`` module
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- imports from ``heat.db.sqlalchemy.migration.versioning_api`` package
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Example::
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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{{stdlib imports in human alphabetical order}}
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\n
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{{third-party lib imports in human alphabetical order}}
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\n
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{{heat imports in human alphabetical order}}
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\n
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\n
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{{begin your code}}
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Human Alphabetical Order Examples
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---------------------------------
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Example::
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import httplib
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import logging
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import random
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import StringIO
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import time
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import eventlet
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import testtools
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import webob.exc
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import heat.api.ec2
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from heat.api import openstack
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from heat.auth import users
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from heat.endpoint import cloud
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import heat.flags
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from heat import test
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Docstrings
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----------
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Example::
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"""A one line docstring looks like this and ends in a period."""
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"""A multi line docstring has a one-line summary, less than 80 characters.
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Then a new paragraph after a newline that explains in more detail any
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general information about the function, class or method. Example usages
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are also great to have here if it is a complex class for function.
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When writing the docstring for a class, an extra line should be placed
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after the closing quotations. For more in-depth explanations for these
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decisions see http://www.python.org/dev/peps/pep-0257/
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If you are going to describe parameters and return values, use Sphinx, the
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appropriate syntax is as follows.
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:param foo: the foo parameter
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:param bar: the bar parameter
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:returns: return_type -- description of the return value
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:returns: description of the return value
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:raises: AttributeError, KeyError
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"""
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Dictionaries/Lists
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------------------
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If a dictionary (dict) or list object is longer than 80 characters, its items
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should be split with newlines. Embedded iterables should have their items
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indented. Additionally, the last item in the dictionary should have a trailing
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comma. This increases readability and simplifies future diffs.
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Example::
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my_dictionary = {
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"image": {
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"name": "Just a Snapshot",
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"size": 2749573,
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"properties": {
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"user_id": 12,
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"arch": "x86_64",
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},
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"things": [
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"thing_one",
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"thing_two",
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],
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"status": "ACTIVE",
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},
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}
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Calling Methods
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---------------
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Calls to methods 80 characters or longer should format each argument with
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newlines. This is not a requirement, but a guideline::
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unnecessarily_long_function_name('string one',
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'string two',
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kwarg1=constants.ACTIVE,
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kwarg2=['a', 'b', 'c'])
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Rather than constructing parameters inline, it is better to break things up::
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list_of_strings = [
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'what_a_long_string',
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'not as long',
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]
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dict_of_numbers = {
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'one': 1,
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'two': 2,
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'twenty four': 24,
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}
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object_one.call_a_method('string three',
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'string four',
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kwarg1=list_of_strings,
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kwarg2=dict_of_numbers)
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Internationalization (i18n) Strings
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-----------------------------------
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In order to support multiple languages, we have a mechanism to support
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automatic translations of exception and log strings.
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Example::
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msg = _("An error occurred")
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raise HTTPBadRequest(explanation=msg)
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If you have a variable to place within the string, first internationalize the
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template string then do the replacement.
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Example::
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msg = _("Missing parameter: %s") % ("flavor",)
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LOG.error(msg)
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If you have multiple variables to place in the string, use keyword parameters.
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This helps our translators reorder parameters when needed.
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Example::
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msg = _("The server with id %(s_id)s has no key %(m_key)s")
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LOG.error(msg % {"s_id": "1234", "m_key": "imageId"})
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None so far
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Creating Unit Tests
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-------------------
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@ -226,7 +26,7 @@ Running Tests
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-------------
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The testing system is based on a combination of tox and testr. The canonical
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approach to running tests is to simply run the command `tox`. This will
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create virtual environments, populate them with depenedencies and run all of
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create virtual environments, populate them with dependencies and run all of
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the tests that OpenStack CI systems run. Behind the scenes, tox is running
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`testr run --parallel`, but is set up such that you can supply any additional
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testr arguments that are needed to tox. For example, you can run:
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@ -241,57 +41,3 @@ run --parallel` will run it in parallel (this is the default incantation tox
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uses.) More information about testr can be found at:
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http://wiki.openstack.org/testr
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openstack-common
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----------------
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A number of modules from openstack-common are imported into the project.
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These modules are "incubating" in openstack-common and are kept in sync
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with the help of openstack-common's update.py script. See:
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http://wiki.openstack.org/CommonLibrary#Incubation
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The copy of the code should never be directly modified here. Please
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always update openstack-common first and then run the script to copy
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the changes across.
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OpenStack Trademark
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-------------------
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OpenStack is a registered trademark of the OpenStack Foundation, and uses the
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following capitalization:
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OpenStack
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Commit Messages
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---------------
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Using a common format for commit messages will help keep our git history
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readable. Follow these guidelines:
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First, provide a brief summary 72 characters in length or less.
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The first line of the commit message should provide an accurate
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description of the change, not just a reference to a bug or
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blueprint. It must be followed by a single blank line.
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If the change relates to a specific driver (libvirt, xenapi, qpid, etc...),
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begin the first line of the commit message with the driver name, lowercased,
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followed by a colon.
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Following your brief summary, provide a more detailed description of
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the patch, manually wrapping the text at 72 characters. This
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description should provide enough detail that one does not have to
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refer to external resources to determine its high-level functionality.
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Once you use 'git review', two lines will be appended to the commit
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message: a blank line followed by a 'Change-Id'. This is important
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to correlate this commit with a specific review in Gerrit, and it
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should not be modified.
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For further information on constructing high quality commit messages,
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and how to split up commits into a series of changes, consult the
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project wiki:
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http://wiki.openstack.org/GitCommitMessages
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