Event Transformation using Event Transformers.

Events are the powerful concept at the center of the SZ Platform. The Event Transformer based Services offer a simple and configurable approach to transforming the payload of events prior to reemiiting events. These are useful for targeting services which expect different payloads.

TRANSFORMER

Example

{
  "some_transformer_event": {
    "conditions": [
      {
        "key": "tkey",
        "val": 9,
        "op": "not_equal"
      }
    ],
    "emit_events": [
      {
        "event_type": "transformed_trigger_event",
        "topic": "ferris.events",
        "transform": [
          {
            "key": "tkey",
            "val": "4",
            "type": "replace"
          },
          {
            "key": "tkey",
            "val": "thekey",
            "type": "rename"
          }
        ]
      }
    ]
  }
}

some_transformer_event - name of the event to apply rules/transforms conditions - conditions to be met for transformation to occur. If multipe conditions are defined and operator is used, all of them must be met to proceed. conditions.key - name of the key to be checked conditions.val - value that should match criteria op - operator that will be used to match criteria, possible options equal, not_equal, in (in array), not_in

emit_events - list of event objects with transformation def event_type - type of the event that will be emitted topic - name of destination topic for event transform - list of keys that should be transformed transform.key - name of the key that should be transformed transform.type - type of transformation that should be applied: replace (will replace value of the key with one provided), rename (will rename the key with one provided in val), remove (will remove key), add (will add new key/val) transform.val - value to be applied (works with transform.type)