Go function return values

Functions triggered by HTTP requests can set the response directly. You can configure the function to do this by using the Go http.ResponseWriter.

Example HTTP response

func Handle(ctx context.Context, res http.ResponseWriter, req *http.Request) {
  // Set response
  res.Header().Add("Content-Type", "text/plain")
  res.Header().Add("Content-Length", "3")
  res.WriteHeader(200)
  _, err := fmt.Fprintf(res, "OK\n")
  if err != nil {
	fmt.Fprintf(os.Stderr, "error or response write: %v", err)
  }
}

Functions triggered by a cloud event might return nothing, error, or CloudEvent in order to push events into the Knative Eventing system. In this case, you must set a unique ID, proper Source, and a Type for the cloud event. The data can be populated from a defined structure, or from a map.

Example CloudEvent response

func Handle(ctx context.Context, event cloudevents.Event) (resp *cloudevents.Event, err error) {
  // ...
  response := cloudevents.NewEvent()
  response.SetID("example-uuid-32943bac6fea")
  response.SetSource("purchase/getter")
  response.SetType("purchase")
  // Set the data from Purchase type
  response.SetData(cloudevents.ApplicationJSON, Purchase{
	CustomerId: custId,
	ProductId:  prodId,
  })
  // OR set the data directly from map
  response.SetData(cloudevents.ApplicationJSON, map[string]string{"customerId": custId, "productId": prodId})
  // Validate the response
  resp = &response
  if err = resp.Validate(); err != nil {
	fmt.Printf("invalid event created. %v", err)
  }
  return
}