func verifyTaskMetadata(taskMetadataRawMsg json.RawMessage) error {
	taskMetadataMap := make(map[string]json.RawMessage)
	json.Unmarshal(taskMetadataRawMsg, &taskMetadataMap)

	if taskMetadataMap["Arn"] == nil {
		return notEmptyErrMsg("Arn")
	}

	if taskMetadataMap["DesiredStatus"] == nil {
		return notEmptyErrMsg("DesiredStatus")
	}

	if taskMetadataMap["KnownStatus"] == nil {
		return notEmptyErrMsg("KnownStatus")
	}

	if taskMetadataMap["Family"] == nil {
		return notEmptyErrMsg("Family")
	}

	if taskMetadataMap["Version"] == nil {
		return notEmptyErrMsg("Version")
	}

	if taskMetadataMap["Containers"] == nil {
		return notEmptyErrMsg("Containers")
	}

	var containersMetadataArray []json.RawMessage
	json.Unmarshal(taskMetadataMap["Containers"], &containersMetadataArray)
	if len(containersMetadataArray) != 1 {
		return fmt.Errorf("incorrect number of containers, expected 1, received %d",
			len(containersMetadataArray))
	}

	return verifyContainerMetadata(containersMetadataArray[0])
}
func verifyTaskMetadata(taskMetadataRawMsg json.RawMessage) error {
	taskMetadataMap := make(map[string]json.RawMessage)
	json.Unmarshal(taskMetadataRawMsg, &taskMetadataMap)

	if taskMetadataMap["Arn"] == nil {
		return notEmptyErrMsg("Arn")
	}

	if taskMetadataMap["DesiredStatus"] == nil {
		return notEmptyErrMsg("DesiredStatus")
	}

	if taskMetadataMap["KnownStatus"] == nil {
		return notEmptyErrMsg("KnownStatus")
	}

	if taskMetadataMap["Family"] == nil {
		return notEmptyErrMsg("Family")
	}

	if taskMetadataMap["Version"] == nil {
		return notEmptyErrMsg("Version")
	}

	if taskMetadataMap["Containers"] == nil {
		return notEmptyErrMsg("Containers")
	}

	var containersMetadataArray []json.RawMessage
	json.Unmarshal(taskMetadataMap["Containers"], &containersMetadataArray)
	if len(containersMetadataArray) != 1 {
		return fmt.Errorf("incorrect number of containers, expected 1, received %d",
			len(containersMetadataArray))
	}

	return verifyContainerMetadata(containersMetadataArray[0])
}
// verifyTaskMetadata verifies the number of containers in task metadata, make
// sure each necessary field is not empty, we cannot check the values of those fields
// since they are dynamic. It also verifies the container metadata.