func (t *Transformer) toMsg(incoming interface{}, msg *message.Msg) error {
switch newMsg := incoming.(type) {
case map[string]interface{}: // we're a proper message.Msg, so copy the data over
msg.Op = message.OpTypeFromString(newMsg["op"].(string))
msg.Timestamp = newMsg["ts"].(int64)
msg.Namespace = newMsg["ns"].(string)
switch data := newMsg["data"].(type) {
case otto.Value:
exported, err := data.Export()
if err != nil {
t.pipe.Err <- t.transformerError(ERROR, err, msg)
return nil
}
d, err := mejson.Unmarshal(exported.(map[string]interface{}))
if err != nil {
t.pipe.Err <- t.transformerError(ERROR, err, msg)
return nil
}
msg.Data = map[string]interface{}(d)
case map[string]interface{}:
d, err := mejson.Unmarshal(data)
if err != nil {
t.pipe.Err <- t.transformerError(ERROR, err, msg)
return nil
}
msg.Data = map[string]interface{}(d)
default:
msg.Data = data
}
case bool: // skip this doc if we're a bool and we're false
if !newMsg {
msg.Op = message.Noop
return nil
}
default: // something went wrong
return fmt.Errorf("returned doc was not a map[string]interface{}")
}
return nil
}