Resources
- https://restfulapi.net/resource-naming/
- https://api.gov.au/standards/national_api_standards/naming-conventions.html
- https://opensource.zalando.com/restful-api-guidelines/
Assumptions
| # | Description |
|---|---|
| 1 | Yang namespaces are globally unique (except for multiple revisions) |
Open Issues/Decisions
| # | Description | Details | Decisions |
|---|---|---|---|
| How to differentiatie GET queries with different parameters. If we dont have named parameters how best to know what is meant | Alternatives
| Team meeting Flavio,Tony,Toine,Bruno,Niamh, Rishi 8 Oct 2020: Use hierarchical resource urls including the concept of 'dataspaces' and 'anchors'. 'Fragments' will be replaced by 'Nodes' e.g. GET /dataspaces/{dataspace_id}/anchors → returns Anchor-points GET /dataspaces/{dataspace_id}/anchors/{anchor-id}/nodes?xpath="..." → returns Node(s) GET /dataspaces/{dataspace_id}/anchors/{anchor-id}/nodes?schema_node_identifier="..." → returns Node(s) GET /dataspaces/{dataspace_id}/nodes&xpath="..." → returns Node(s) GET /dataspaces/{dataspace_id}/modules → returns Modules | |
| Advance queries v Simple Queries (gets) for data fragments. Do we want/need differentiatie on UTL? |
Note . The xpath could be a full unambiguous xpath returning one object or it could be partial path using wildcards etc allowing for more advanced queries return 0 or more fragments (developed over many iterations) | Team meeting Flavio,Tony,Toine,Bruno,Niamh, Rishi 8 Oct 2020: Advanced queries will implemented as advanced xpath' (and or schema node identifiers) no need for separate URLs | |
| We have no modules sets! | model files just arbitrarily group a few modules, is there a need to persist this grouping (We do have the concept of a dataspace as well) | Team meeting Flavio,Tony,Toine,Bruno,Niamh, Rishi 8 Oct 2020: The way modules are delivered i.e. grouped in files is not relevant for the CPS application. What needs to be stored for each 'anchor' is the namespace and revision of the model that describes the 'root' of that instance | |
| 4 | Treat operations with xpath and schema_node_identifier as 'queies' using POST? |
API definitions
Note 1. This list of URL operations is not meant to be complete or final. It is mainly a starting point to establish a pattern and naming convention for the Configuration Persistence Service.
Note 2. All urls in below table will be prefixed with something like : <server>/api/cps/v1/
Note 3. This does not yet cover authorization.
| # | Operation | Payload | Description | |
|---|---|---|---|---|
Modelling storage | 1 | POST /dataspaces/{dataspace-id}/modules | File | Create (and validate) a module set (upload a model file) for the given dataspace. Payload is a file containing 1 or more yang modules. This operation will also create a dataspace. |
| 2 | GET /dataspaces/{dataspace-id}/modules | Read all modules in the store for the given dataspace | ||
| 3 | GET /dataspaces/{dataspace-id}/modules/namespace/{namespace-id} | Read all modules in the store for the given dataspace and namespace | ||
| 4 | GET /dataspaces/{dataspace-id}/modules/namespace/{namespace-id}/revision/{revision} | Read all modules in the store for the given dataspace, namespace and revision | ||
Anchor persistence | 5 | POST /dataspaces/{dataspace-id}/anchors | Json Object | Create a new anchor in the given dataspace (payload includes anchor name, module namespace and revision) |
| 6 | GET /dataspaces/{dataspace-id}/anchors/{anchor-id} | Read an anchor and the associated attributes given a anchor ID and a dataspace. | ||
| 7 | DELETE /dataspaces/{dataspace-id}/anchors/{anchor-id} | Delete an anchor given a anchor ID and a dataspace. This will delete the whole tree | ||
| 8 | GET /dataspaces/{dataspace-id}/anchors | Read all anchors in the given a dataspace. | ||
Node persistence | 9 | POST /dataspaces/{dataspace-id}/nodes | File | Create a (root) node for a given anchor for the given dataspace, the node can have children. Their children will also be persisted as separate nodes in the system. |
| 10 | GET /dataspaces/{dataspace-id}/anchors/{anchor-id}/nodes?xpath="..." | Get a node given an anchor for the given dataspace (return just one level with just xpath references to its children) | ||
| 11 | GET /dataspaces/{dataspace-id}/nodes&xpath="..." | Get a node (under any anchor) given a Xpath expression for the given dataspace | ||
| 12 | GET /dataspaces/{dataspace-id}/nodes?schema_node_identifier="..." | Get all the relevant nodes given a schema node identifier for the given dataspace (not need to specify dataspace is schema-node-identifier is globally unique) | ||
| Queries (Alternative for #10-#12 above, see open issue #4) | 10 | POST /dataspaces/{dataspace-id}/anchors/{anchor-id}/queries | Request body: | Get a node given an anchor for the given dataspace (return just one level with just xpath references to its children) |
| 11 | POST /dataspaces/{dataspace-id}/queries | Request body: { xpath: { xpath specification }} | Get a node (under any anchor) given a Xpath expression for the given dataspace | |
| 12 | POST /dataspaces/{dataspace-id}/queries | Request body: { schema_node_identifier: { schema_node_identifierspecification }} | Get all the relevant nodes given a schema node identifier for the given dataspace (not need to specify dataspace is schema-node-identifier is globally unique) |