CNCF Functions Support

The Rapid Adapter Builder platform supports expressions from the Cloud Native Computing Foundation (CNCF) functions.

Adapter developers can use jq expression language while building flows using Cloud Native Computing Foundation (CNCF) functions.

Sample code to define a CNCF function:

"functions": [
        {
          "name": "extractWebhookIdFunc",
          "operation": "[{fileId: .configuration.fileId, webhook: .entries[]}] | map(select(.webhook.target.id==.fileId)) | .[0].webhook.id",
          "type": "expression"
        }
      ],

Sample code to implement the CNCF function:

"states": [
        {
          "actions": [
             {
              "functionRef": {
                "refName": "extractWebhookIdFunc"
              },
              "actionDataFilter": {
                "toStateData": "${ .webhookId }"
              }
            }
          ]
     }
]

The Rapid Adapter Builder platform supports the following constructs of the Serverless Workflow specification:

• Workflow Constructs
• Function Definitions
• State Definitions
• Operation State
• Switch State
• State Actions

Workflow Constructs

This table shows the supported operations in the CNCF workflow function.

Operation	Details
specVersion	Indicates the supported version of the Serverless Workflow specification. The Rapid Adapter Builder platform supports 0.8 version.
functions	A unique function name that follows the serverless workflow naming convention.
states	States dictate the control flow logic instructions of a workflow.

Function Definitions

This table shows the supported operations in the CNCF function definition.

Operation	Details
expression	The expression operation.
custom	A property that defines a list of function types that are set by the specification.

State Definitions

This table shows the supported operations in the state definition.

Operation	Details
functionRef	Defines the name of the referenced function. This can be either a string or an object.
actionDataFilter	A filter that you can use within an action.
condition	The condition operation.

Operation State

This table shows the supported operations in the CNCF operation state.

Operation	Details
Multiple actions	Supports multiple actions.
transition	One or more incoming or outgoing transitions of a serverless workflow state.
end	A boolean or object type.

Switch State

This table shows the supported operations in the CNCF switch state.

Operation	Details
dataConditions	A data-based condition statement. When evaluated to true causes a transition to a predefined workflow state.
defaultCondition	A switch state that enables the default transition of a workflow when there are no matching data conditions or if an event timeout occurs.

State Actions

This table shows the supported operations in the CNCF state actions.

Operation	Details
Operation State	A set of actions that are performed in sequence or in parallel. State transition occurs once all the actions are completed.
Switch State	A workflow gateway that directs transition of workflows based on defined conditions.