How to define Activity return values in Go

A Go-based Activity Definition can return either just an error or a customValue, error combination (same as a Workflow Definition). You may wish to use a struct type to hold all custom values, just keep in mind they must all be serializable.

type YourActivityResult struct{
  ActivityResultFieldOne string
  ActivityResultFieldTwo int
}

func (a *YourActivityStruct) YourActivityDefinition(ctx context.Context, param YourActivityParam) (YourActivityResult, error) {
  // ...
  result := YourActivityResult {
    ActivityResultFieldOne: a.ActivityFieldOne,
    ActivityResultFieldTwo: a.ActivityFieldTwo,
  }
  return result, nil
}