Templating

For the YaWL specification fields that support templating, values can be generated dynamically using the data obtained from the workflow state. The templating language is jq. For more information, see the jq documentation.

By default, templating is not used for string values of fields; use string interpolation instead.

Input data for the templaterInput data for the templater

The templater input data will be different depending on the field.

Templater usage examplesTemplater usage examples

Full workflow state example:

{
  "data": [
    {
      "some_property_0": "value_0"
    },
    {
      "some_property_1": "value_1"
    }
  ],
  "a": {
    "b": {
      "c": "value_2"
    }
  }
}

Templater extensionsTemplater extensions

Templater extensions allow you to call jq functions implementing non-standard logic.

$global variable$global variable

The $global variable returns the top-level state of the workflow before starting the current top-level step. For example, in the Foreach step, input data filtering is a required attribute, and the $global variable can be used within the sequence of steps in do to retrieve the workflow state as it was before Foreach started (top-level state).

$counter variable$counter variable

The $counter variable returns the current operation index (indexing starts from zero). You can use the variable inside the input and condition fields of the While step.

Yandex LockboxYandex Lockbox

A special lockboxPayload jq function allows you to get the value of the Yandex Lockbox secret by its ID, key and (optionally) version. For the extension to work correctly, the workflow settings must specify a service account that has permissions to view the secret contents, e.g., the one with the lockbox.payloadViewer role.

Description of the lockboxPayload jq function arguments:

Examples of using the jq functionExamples of using the lockboxPayloadjq function

• Getting the latest secret version:

  \(lockboxPayload("<secret_ID>"; "<secret_key>"))
  

• Getting the specified secret version:

  \(lockboxPayload("<secret_ID>"; "<secret_key>"; "<secret_version_ID>"))