code: func ScanLogStream(appID, sourceType, sourceInstance string, reader io.Reader) {
  	if logSender == nil {
  		return
  	}
  	logSender.ScanLogStream(appID, sourceType, sourceInstance, reader)
  }
docs: // ScanLogStream sends a log message with the given meta-data for each line from reader.
  // Restarts on read errors and continues until EOF.