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86 lines
2.5 KiB
Markdown
86 lines
2.5 KiB
Markdown
Coding Standards and Practices
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This is not meant to be a style document so much as a practices document for ensuring performance and convention in the Ansible Tower API.
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Paginate Everything
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===================
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Anything that returns a collection must be paginated.
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Assume large data sets
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======================
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Don't test exclusively with small data. Assume 1000-10000 hosts in all operations, with years of event data.
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Some of our users have 30,000 machines they manage.
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API performance
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===============
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In general, the expected response time for any API call is something like 1/4 of a second or less. Signs of slow API
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performance should be regularly checked, particularly for missing indexes.
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Missing Indexes
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===============
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Any filters the UI uses should be indexed.
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Migrations
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==========
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Always think about any existing data when adding any new fields. It's ok to wait in upgrade time to get the database to be
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consistent.
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Limit Queries
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=============
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The number of queries made should be constant time and must not vary with the size of the result set.
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Consider RBAC
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=============
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The returns of all collections must be filtered by who has access to view them, without exception
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Discoverability
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===============
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All API endpoints must be able to be traversed from "/", and have comments, where possible, explaining their purpose
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Friendly Comments
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=================
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All API comments are exposed by the API browser and must be fit for customers. Avoid jokes in API comments and error
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messages, as well as FIXME comments in places that the API will display.
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UI Sanity
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=========
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Where possible the API should provide API endpoints that feed raw data into the UI, the UI should not have to do lots of
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data transformations, as it is going to be less responsive and able to do these things.
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When requiring a collection of times of size N, the UI must not make any extra API queries for each item in the result set
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Effective Usage of Query Sets
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=============================
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The system must return Django result sets rather than building JSON in memory in nearly all cases. Use things like
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exclude and joins, and let the database do the work.
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Serializers
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===========
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No database queries may be made in serializers because these are executed once per item, rather than paginated.
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REST verbs
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==========
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REST verbs should be RESTy. Don't use GETs to do things that should be a PUT or POST.
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Unit tests
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==========
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Every URL/route must have unit test coverage. Consider both positive and negative tests.
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