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0.0.6 • Public • Published

resource-base-interface

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The resource-base-interface describes resource CRUD operations which can be bound to a service. Such operations are described via a gRPC interface with the message structures therefore being defined using Protocol Buffers. This interface can be bound with any protobuf definition as long as it contains the endpoints defined in the resource-base.proto file (note that any resource message structure can be defined).

The exposed gRPC methods are implemented by the ServiceBase object which uses a ResourceAPI instance to perform operations with a database provider. The exposed interface is therefore agnostic to a specific database implementation. However, a valid database provider is required. A set of such providers is implemented in chassis-srv. This interface emits resource-related messages to Apache Kafka which can be enabled or disabled at the ServiceBase's constructor.

Methods for managing and traversing graph databases are supported for the ArangoDB provider

gRPC Interface

This interface describes the following gRPC endpoints for a generic resource of type Resource.

io.restorecommerce.resourcebase.Resource

Field Type Label Description
id string required identifier for the resource
meta io.restorecommerce.meta.Meta meta optional Meta information common to all Restore Commerce resources
value number optional value for the resource
text string optional textual data for the resource

Create

This operation is used for inserting resources to the database. Requests are performed by providing a list of resources which are returned in the response. A meta should be present, containing relevant resource ownership information. Timestamps for creation and modification are then appended automatically to this property upon a Create request. The resource is stored as a normal collection document by default. If there is a graph configuration specified for the resource then it is stored as a vertex collection along with the edge definitions provided in the configuration.

io.restorecommerce.resourcebase.ResourceList

Field Type Label Description
items [ ] io.restorecommerce.resourcebase.Resource required list of resources
total_count number optional total number of resources

Read

This operation returns resources based on provided filter and options. Requests are performed using io.restorecommerce.resourcebase.ReadRequest and responses are a list of resources.

google.protobuf.Struct

Field Type Label Description
fields map<string, Value> optional Unordered map of dynamically typed values.

io.restorecommerce.resourcebase.Sort

Field Type Label Description
field string optional field to be sorted upon
SortOrder enum optional sorting order, UNSORTED, ASCENDING or DESCENDING

io.restorecommerce.resourcebase.FieldFilter

Field Type Label Description
name string optional field name
include bool optional include or exclude field

io.restorecommerce.resourcebase.ScopeFilter

Field Type Label Description
scope string optional scope to operate on
instance string optional value to compare

io.restorecommerce.resourcebase.ReadRequest

Field Type Label Description
offset number optional offset of the resource
limit number optional limit, default value is 1000
filter google.protobuf.Struct optional filter based on field values, multiple filters can be combined with AND and OR operators
sort [ ]io.restorecommerce.resourcebase.Sort optional sort the resources
field [ ] io.restorecommerce.resourcebase.FieldFilter optional fields selector, list of fields to be included or excluded, by default we get all the fields
search [ ]string optional word search, not yet implemeneted
locales_limiter [ ]string optional querying based on locales, not yet implemented
scope io.restorecommerce.resourcebase.ScopeFilter optional scope to operate on, not yet implemented

Update

This operation is used for updating resources in the database. Requests are performed by providing a list of resources and all updated items are returned within the response. Note that the only required properties on each resource are its id and the properties which are meant to be modified. It is possible to specify in the configuration multiple edge definitions for one vertex. These edges are automatically updated when vertex documents are updated.

Upsert

This operation is used for updating resources in the database or creating them if they do not exist. Requests are performed by providing a resource list, which is returned in the response.

Delete

This operation is used for deleting resources in the database. Requests are performed using io.restorecommerce.resourcebase.DeleteRequest and responses are google.protobuf.Empty messages. If a graph vertex is deleted, all connected edges are also deleted.

io.restorecommerce.resourcebase.DeleteRequest

Field Type Label Description
collection string required Name of the target collection
ids [ ]string optional List of resource identifiers to be deleted; if empty or not provided, the whole collection is truncated

Traversal

This operation is used for traversing graph resource in the database. Requests are performed using io.restorecommerce.graph.TraversalRequest and respone is io.restorecommerce.graph.TraversalResponse message.

io.restorecommerce.graph.TraversalRequest

Field Type Label Description
start_vertex string required this can be either the _id or the _key of a vertex in the collection
opts io.restorecommerce.graph.Options optional List of options for graph traversal
collection_name string optional starting vertex's Collection name
edge_name string optional edge name for traversal
data bool optional if set to true only the vertices data is returned
path bool optional if set to true only the traversed paths are returned
aql bool optional if set to true traversal is executed as an AQL query

io.restorecommerce.graph.Options

Field Type Label Description
direction string optional Graph traversal direction, possible values are outbound or inbound, if not provided by default it is outbound traversal
filter [ ] io.restorecommerce.graph.Filter optional List Vertexes to be filtered out, i.e. these vertices are not traversed
expander [ ] io.restorecommerce.graph.Expander optional List of edges to be included in the traversal, by default all edges are included in traversal
sort string optional JS code of custom comparison function for the edges
min_depth uint32 optional visits only vertices in atleast the give depth
start_vertex string optional id of the start vertex
visitor string optional JS code of custom visitor function
init string optional JS code of custom result initialization function
item_order string optional item iteration order, possible values are either forward or backward
strategy string optional traversal strategy, possible values are either depthfirst or breadthfirst
max_iterations uint32 optional maximum number of iterations in each traversal, this is used to prevent endless loops in cyclic graphs
max_depth uint32 optional visits nodes in at most the given depth
uniqueness io.restorecommerce.graph.Uniqueness optional specifiy uniqueness for vertices and edges visited
order string optional traversal order, possible values are preorder, postorder or preorder-expander
graph_name string optional name of graph that contain the edges
edge_collection string optional name of the collection that contains the edges

io.restorecommerce.graph.Filter

Field Type Label Description
vertex string optional vertex would be excluded on traversal

io.restorecommerce.graph.Expander

Field Type Label Description
edge string optional expand this edge
direction string optional direction of traversal, either outbound or inbound

io.restorecommerce.graph.Uniqueness

Field Type Label Description
vertices string optional specifies uniqueness for vertices visited, possible values are none, global or path
edges string optional specifies uniqueness for edges visited, possible values are none, global or path

io.restorecommerce.graph.TraversalResponse

Field Type Label Description
vertex_fields [ ] io.restorecommerce.graph.VertexFields required Object containing vertex metadata: id, _id, _key and _rev values
paths google.protobuf.Any required buffered data, contains the list of visited paths
data google.protobuf.Any required buffered data, contains all the data from the visited vertices

io.restorecommerce.graph.VertexFields

Field Type Label Description
_id string required vertex document handle
_key string required vertex document unique key
_rev string required revision or vertex document ETag
id string required id of the vertex collection

Kafka Events

A kafka Topic can be provided when instantiating a ServiceBase. If enableEvents is set to true, a list of events is then emitted to Kafka by this microservice for each document of each CRUD request :

  • Created
  • Read
  • Modified
  • Deleted

The events emitted to Kafka can be used for restoring the system in case of failure by implementing a command-interface in the used microservice. For usage details please see command-interface tests.

Fields Configuration

It is possible to pass a fields configuration object to ResourceAPI in order to enable some special field handlers.

Field Generators

The strategies property can be used to specify fields within each resource which should be generated automatically. Such autogeneration feature currently includes UUIDs, timestamps and sequential counters. The latter one is particularly useful for fields such as a customer or an item number, which can have a type of sequential logic. In these cases, a Redis database is used to generate and read these values efficiently.

Buffer Fields

Buffer-encoded fields can be decoded before being stored in the database. It is possible to specify within the bufferFields property what fields of each resource should be specially handled this way. The values are also encoded into a buffer again when read from the database.

Required Fields

It is possible to specify which fields are required for each document of each resource on the requiredFields config. An InvalidArgument error is thrown if one of these fields is missing when attempting to store a document.

Development

Tests

See tests. To execute the tests a set of backing services are needed. Refer to System repository to start the backing-services before running the tests.

  • To run tests
npm run test

Usage

  • Install dependencies
npm install
  • Build
# compile the code 
npm run build

Install

npm i @restorecommerce/resource-base-interface

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91

Version

0.0.6

License

MIT

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