Spring Runners

These runners are based on Java Spring library.

All relevant Spring configurations are applicable, and can be passed on to these runners using properties files.

All Spring runners accept following configurations, in addition to the common security configurations mentioned in Gateway & Security:

Parameter	Definition	Example	Default
rierino.runner.[name].offset.class	Fully qualified class name for assigning offsets	com.rierino.handler.util.generator.ConstantNumberGenerator	-
rierino.runner.[name].offset.[parameter]	Offset generator specific parameters	value=5	-
rierino.runner.[name].partition	Partition assigned to runner (used for non-broadcasted topics)	1	-
rierino.runner.[name].authentication.enabled	Whether runner requires authentication for API calls	true	false
rierino.runner.[name].authentication.role	Role required (on service account) for making API calls	internal	-

Authentication

If authentication is enabled on a runner (which is different than authentication on API gateways), the following parameters are also applicable, based on preferred authentication method:

Simple Authentication

Simplest form of authentication, using a predefined API key without hashing and roles:

Parameter	Definition	Example	Default
rierino.runner.[name].authentication.token	API key used for authenticating requests	DEMO	-

Hashed Authentication

Parameter	Definition	Example	Default
rierino.runner.[name].authentication.secret	Secret to use for hashing API keys	-	-
rierino.runner.[name].authentication.algorithm	Algorithm for hashing API keys	MD5	SHA-256
rierino.runner.[name].authentication.iterations	Number of iterations for hashing API keys	100	1
rierino.runner.[name].authentication.cache.state	State manager which keeps acceptable hashed keys with their role mappings (should manage its own TTL)	key_store	-
rierino.runner.[name].authentication.system	System to run a saga on, for validating a hashed API key and returning its roles	admin_core	-
rierino.runner.[name].authentication.stream	Stream to run a saga on, for validating a hashed API key and returning its roles	rpc	-
rierino.runner.[name].authentication.action	Action (i.e. saga path) to run, for validating a hashed API key and returning its roles	ProcessAPIKey	-

Authentication cache state can be a shared state manager, allowing use of predefined and hashed list of API keys and roles without using Sagas to produce them.

CRUD Event Runner

CRUDEventRunner (com.rierino.runner.spring.CRUDEventRunner) is a Spring WebFlux based runner, which accepts typical REST calls through http or https protocols for common CRUD operations.

Each request method and path is mapped on to a specific action and processed based on the elements configured on the runner. Path mappings are as follows:

List records

get

Lists all records for a given state manager, with the following action mappings:

• With no ids and filters parameters: action=GetAll, outputElement=list, state=[state], stream=[state]r
• With ids parameters: action=GetList, payload={list:[{id:id1},...]}, inputElement=list, state=[state], stream=[state]r
• With filters parameters: payload=[filters], state=[state], stream=[state]c

Path parameters

runnerstringRequiredExample: crud

statestringRequiredExample: product

Query parameters

skipstringOptionalExample: 0

limitstringOptionalExample: 10

fieldsstringOptionalExample: data.name,data.description

orderBystringOptionalExample: id asc

idsstringOptionalExample: 123,234

Responses

200

successful operation

application/json

get

HTTPcURLJavaScriptPython

GET /api/{runner}/{state} HTTP/1.1
Host: localhost
Accept: */*

200

successful operation

{
  "list": [
    {}
  ]
}

Read a record

get

Reads a single record for a given state manager, with the following action mappings: action=Get, payload={id:[id]}, state=[state], stream=[state]r

Path parameters

runnerstringRequiredExample: crud

statestringRequiredExample: product

idstringRequiredExample: 123

Query parameters

fieldsstringOptionalExample: data.name,data.description

Responses

200

successful operation

application/json

Responseobject

Found aggregate

get

HTTPcURLJavaScriptPython

GET /api/{runner}/{state}/{id} HTTP/1.1
Host: localhost
Accept: */*

200

successful operation

{}

Creates a record without given ID

post

Creates a single record for a given state manager, with the following action mappings: action=Create, payload={[body]}, state=[state], stream=[state]w

Path parameters

runnerstringRequiredExample: crud

statestringRequiredExample: product

Body

dataobjectOptional

Responses

200

successful operation

application/json

Responseobject

Created aggregate

post

HTTPcURLJavaScriptPython

POST /api/{runner}/{state} HTTP/1.1
Host: localhost
Content-Type: application/json
Accept: */*
Content-Length: 11

{
  "data": {}
}

200

successful operation

{}

Creates a record with given ID

post

Creates a single record for a given state manager, with the following action mappings: action=Create, payload={[body], id:[id]}, state=[state], stream=[state]w

Path parameters

runnerstringRequiredExample: crud

statestringRequiredExample: product

idstringRequiredExample: 123

Body

idstringOptionalExample: 123

dataobjectOptional

Responses

200

successful operation

application/json

Responseobject

Created aggregate

post

HTTPcURLJavaScriptPython

POST /api/{runner}/{state}/{id} HTTP/1.1
Host: localhost
Content-Type: application/json
Accept: */*
Content-Length: 22

{
  "id": "123",
  "data": {}
}

200

successful operation

{}

Overwrite a record

put

Overwrites a single record for a given state manager, with the following action mappings: action=Set, payload={[body], id:[id]}, state=[state], stream=[state]w

Path parameters

runnerstringRequiredExample: crud

statestringRequiredExample: product

idstringRequiredExample: 123

Body

idstringOptionalExample: 123

dataobjectOptional

Responses

200

successful operation

application/json

Responseobject

Overwritten aggregate

put

HTTPcURLJavaScriptPython

PUT /api/{runner}/{state}/{id} HTTP/1.1
Host: localhost
Content-Type: application/json
Accept: */*
Content-Length: 22

{
  "id": "123",
  "data": {}
}

200

successful operation

{}

Patch a record

patch

Patches a single record for a given state manager, with the following action mappings: action=Update, payload={[body], id:[id]}, state=[state], stream=[state]w

Path parameters

runnerstringRequiredExample: crud

statestringRequiredExample: product

idstringRequiredExample: 123

Body

idstringOptionalExample: 123

dataobjectOptional

Responses

200

successful operation

application/json

Responseobject

Patched aggregate

patch

HTTPcURLJavaScriptPython

PATCH /api/{runner}/{state}/{id} HTTP/1.1
Host: localhost
Content-Type: application/json
Accept: */*
Content-Length: 22

{
  "id": "123",
  "data": {}
}

200

successful operation

{}

Delete a record

delete

Deletes a single record for a given state manager, with the following action mappings: action=Delete, payload={id:[id]}, state=[state], stream=[state]w

Path parameters

runnerstringRequiredExample: crud

statestringRequiredExample: product

idstringRequiredExample: 123

Responses

200

successful operation

application/json

Responseobject

Deleted aggregate

delete

HTTPcURLJavaScriptPython

DELETE /api/{runner}/{state}/{id} HTTP/1.1
Host: localhost
Accept: */*

200

successful operation

{}

Perform write actions

post

Executes multiple write actions at once using the following mappings: action=[action], inputElement=[inputElement], outputElement=[outputElement], meta=[meta]

Path parameters

runnerstringRequiredExample: crud

statestringRequiredExample: product

Body

actionstringOptionalExample: Create

inputElementstringOptional

outputElementstringOptional

metaobjectOptional

Event meta parameters for the action requested

Responses

200

successful operation

application/json

Responseobject

Action results

post

HTTPcURLJavaScriptPython

POST /api/{runner}/{state}/@ HTTP/1.1
Host: localhost
Content-Type: application/json
Accept: */*
Content-Length: 74

{
  "action": "Create",
  "inputElement": "text",
  "outputElement": "text",
  "meta": {}
}

200

successful operation

{}

CRUD event runner also supports using /[action]_[state] Saga flows for these requests if the input stream is mapped to a Saga event handler.

This event runner accepts request metadata in "request_metadata" header, as a base64 encoded Json string.

RPC Event Runner

RPCEventRunner (com.rierino.runner.spring.RPCEventRunner) is a Spring WebFlux based runner, which accepts remote procedure call type requests through http or https protocols for more customized use cases.

The request path defines the stream and action in /api/[runner]/[stream]/[action] form, and the request body is used as the full event contents, including request metadata and payload itself.

Using /api_direct instead of /api in calls to these runners allows sending requests in payload form, without requiring full event data format. This option is usable only when making calls directly to the runners from inside the cluster, without passing them through the API gateways.

RSocket Event Runner

RSocketEventRunner(com.rierino.runner.spring.RSocketEventRunner) is a RSocket based runner, which accepts continuous requests through socket connections for low latency and frequent use cases.

Message path defines the stream and action in /api/[runner]/[stream]/[action] form, and the message payload is used as the full event contents.

SpringSpring

Spring Page

Spring runners can listen to Kafka streams, but only for command, journal and pulses (and not events or other role data).