b62518d952
The YAML format is intended for human interaction. Scripts also want to consume this data, so we'd like to publish a machine-friendly format for them. That format adds a version and a sha, so that people have a way to trace the published data back to its source, as well as forward and reverse mappings built from the data to simplify the questions consumers will wind up querying from the data. Change-Id: Ia62e01ca4380df0a36daaf76fe90e5f808ac7773
Service Types Authority
The following is a central authority for handing out service types to projects for their services.
Each OpenStack Service with a REST API must have a well known service type. The well known service type guarantees a documented API is available for that service. Users of this service can trust that it will be the same between different OpenStack environments.
Attributes
The following attributes are required for a service type registration:
service-type (required)
The unique identifier for the service to be used in the service catalog.
project (required)
An OpenStack git project that contains the definition of the API claimed by this service type. This is assumed to be a code repository, though if multiple projects are implementing the same API they can choose to have this be an API definition repository instead.
Project is a singleton and defines the reference point for the API in question.
api_reference (required)
A published API reference document for the API identified by this service type.
description (optional)
A short description about the service in question. It helps people reading only this document.
aliases (optional)
An ordered list of historical aliases for this service type.
Note
The list of aliases is only for communicating the
existing set of other names that services have gone by from the time
before this list existed. Changing a service-type is
VERY BAD and breaks users. It's important to list them
so that everyone can share in the knowledge of what to do with the
clouds that are out there, but seriously, putting things here is only
for documenting history, not for making new changes.
A service must have one and only one known service type. However,
there are older names that have been commonly used for some services. In
order for API consumers to be able to count on the Service Types
Authority service-type as an inbound interface they expect,
aliases provides a ordered list of known fallback names. If
an API consumer cannot find a given service-type in the
service-catalog, they are directed to try the list of
aliases here, in the order they are given, in order to find
the requested endpoint.
Naming
Service types should be:
- English words
- Be matched by the regex ^[a-z][a-z-]+$
- Be meaningful
- Not use terms which are incredibly overloaded in OpenStack space (i.e. policy)
- A thing, not an action (i.e. load-balancer, not load-balancing)
- Singular instead of plural (i.e. image, not images)
- Unversioned (volume, not volumev2)
Non Official Types in Service Catalog
The OpenStack Service Catalog can be used for listing services outside of the standardized service types. There will be no official registry of these types, so conflicts are possible. As such, the types should include an org prefix '$org:' where $org is something recognizable to a particular organization and not part of the OpenStack ecosystem.