func decodeTransactGetItemsOutput()

in dax/internal/client/response.go [813:872]
54 lines of code
16 McCabe index (conditional complexity)

func decodeTransactGetItemsOutput(ctx context.Context, reader *cbor.Reader, input *dynamodb.TransactGetItemsInput, keySchemaCache *lru.Lru, attrListIdToNames *lru.Lru, output *dynamodb.TransactGetItemsOutput) (*dynamodb.TransactGetItemsOutput, error) {
	length, err := reader.ReadArrayLength()
	if err != nil {
		return output, err
	}
	if length != 2 {
		return output, &smithy.SerializationError{Err: fmt.Errorf("TransactGetResponse needs to have 2 elements, instead had: %d", length)}
	}

	if output == nil {
		output = &dynamodb.TransactGetItemsOutput{}
	}

	numR, err := reader.ReadArrayLength()
	if err != nil {
		return output, err
	}
	if numR != len(input.TransactItems) {
		return output, &smithy.SerializationError{Err: fmt.Errorf("TransactGetResponse need to have the same number of Responses "+
			"as the length of TransactItems in the input: %d, instead had: %d", len(input.TransactItems), numR)}
	}

	responses := make([]types.ItemResponse, numR)
	for i := 0; i < numR; i++ {
		get := input.TransactItems[i].Get
		projectionOrdinals, err := buildProjectionOrdinals(get.ProjectionExpression, get.ExpressionAttributeNames)
		if err != nil {
			return output, err
		}
		item, err := decodeNonKeyAttributes(ctx, reader, attrListIdToNames, projectionOrdinals)
		if err != nil {
			return output, err
		}
		// The key attributes are only added if it's NOT a projection
		if item != nil && len(projectionOrdinals) == 0 {
			for k, v := range get.Key {
				item[k] = v
			}
		}
		responses[i] = types.ItemResponse{Item: item}
	}
	output.Responses = responses

	numCC, err := reader.ReadArrayLength()
	if err != nil {
		return output, err
	}
	if numCC > 0 {
		output.ConsumedCapacity = make([]types.ConsumedCapacity, numCC)
		for i := 0; i < numCC; i++ {
			capacity, err := decodeConsumedCapacityExtended(reader)
			if err != nil {
				return output, err
			}
			output.ConsumedCapacity[i] = *capacity
		}
	}

	return output, nil
}