func allLoggerFunction()

in functions/events-all-logger/all_logger.go [33:79]
30 lines of code
7 McCabe index (conditional complexity)

func allLoggerFunction(ctx context.Context, e event.Event) error {
	// Print out the raw data to start, so we always see *something* in the logs.
	fmt.Printf("pinball-event-raw: %s", e.Data())

	// Parse the JSON into a generic map
	var event map[string]interface{}
	if err := json.Unmarshal([]byte(e.Data()), &event); err != nil {
		return fmt.Errorf("error parsing JSON: %v", err)
	}

	// Expect events to have a base64 encoded 'data' field. This doesn't
	// make for great log messages. Decode and replace before logging.
	// Stat by checking for 'message'
	if message, ok := event["message"].(map[string]interface{}); ok {
		// Extract and decode the 'data' field from 'message'
		if dataEncoded, ok := message["data"].(string); ok {
			dataDecoded, err := base64.StdEncoding.DecodeString(dataEncoded)
			if err != nil {
				return fmt.Errorf("error decoding base64: %v", err)
			}

			// Parse the JSON into a generic map, so we get a complete
			// JSON doc after we add it back to the message a re-serialize
			var data map[string]interface{}
			if err := json.Unmarshal([]byte(dataDecoded), &data); err != nil {
				return fmt.Errorf("error parsing JSON from 'data' field: %v", err)
			}

			message["data"] = data

			// Re-serialize
			updatedJSON, err := json.Marshal(event)
			if err != nil {
				return fmt.Errorf("error re-serializing JSON: %v", err)
			}
			// Print as JSON string, so Cloud Logging will parse as JSON
			// ("Structured Logging") and allow querying by fields in the document
			fmt.Printf("%s\n", updatedJSON)
		} else {
			return fmt.Errorf("data field not found within message or not a string")
		}
	} else {
		return fmt.Errorf("message field not found")
	}

	return nil
}