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Octavia-lib Style Commandments

This project was ultimately spawned from work done on the Neutron project. As such, we tend to follow Neutron conventions regarding coding style.

-- Read the OpenStack Octavia style guide: - https://docs.openstack.org/octavia/latest/contributor/HACKING.html

Octavia Specific Commandments

  • [O316] Change assertTrue(isinstance(A, B)) by optimal assert like assertIsInstance(A, B).
  • [O318] Change assert(Not)Equal(A, None) or assert(Not)Equal(None, A) by optimal assert like assertIs(Not)None(A).
  • [O319] Validate that debug level logs are not translated.
  • [O321] Validate that jsonutils module is used instead of json
  • [O322] Don't use author tags
  • [O323] Change assertEqual(True, A) or assertEqual(False, A) to the more specific assertTrue(A) or assertFalse(A)
  • [O324] Method's default argument shouldn't be mutable
  • [O338] Change assertEqual(A in B, True), assertEqual(True, A in B), assertEqual(A in B, False) or assertEqual(False, A in B) to the more specific assertIn/NotIn(A, B)
  • [O339] LOG.warn() is not allowed. Use LOG.warning()
  • [O340] Don't use xrange()
  • [O341] Don't translate logs.
  • [0342] Exception messages should be translated
  • [O343] Python 3: do not use basestring.
  • [O344] Python 3: do not use dict.iteritems.
  • [O345] Usage of Python eventlet module not allowed
  • [O346] Don't use backslashes for line continuation.
  • [O501] Direct octavia imports not allowed.

Creating Unit Tests

For every new feature, unit tests should be created that both test and (implicitly) document the usage of said feature. If submitting a patch for a bug that had no unit test, a new passing unit test should be added. If a submitted bug fix does have a unit test, be sure to add a new one that fails without the patch and passes with the patch.

Everything is python

Although OpenStack apparently allows either python or C++ code, at this time we don't envision needing anything other than python (and standard, supported open source modules) for anything we intend to do in Octavia-lib.

Idempotency

With as much as is going on inside Octavia-lib, its likely that certain messages and commands will be repeatedly processed. It's important that this doesn't break the functionality of the load balancing service. Therefore, as much as possible, algorithms and interfaces should be made as idempotent as possible.

Avoid premature optimization

Understand that being "high performance" is often not the same thing as being "scalable." First get the thing to work in an intelligent way. Only worry about making it fast if speed becomes an issue.

Don't repeat yourself

Octavia-lib strives to follow DRY principles. There should be one source of truth, and repetition of code should be avoided.

Security is not an afterthought

The load balancer is often both the most visible public interface to a given user application, but load balancers themselves often have direct access to sensitive components and data within the application environment. Security bugs will happen, but in general we should not approve designs which have known significant security problems, or which could be made more secure by better design.

Octavia-lib should follow industry standards

By "industry standards" we either mean RFCs or well-established best practices. We are generally not interested in defining new standards if a prior open standard already exists. We should also avoid doing things which directly or indirectly contradict established standards.