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sort.go
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sort.go
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// Copyright 2021 FerretDB Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package stages
import (
"context"
"errors"
"github.com/FerretDB/FerretDB/internal/handlers/common"
"github.com/FerretDB/FerretDB/internal/handlers/common/aggregations"
"github.com/FerretDB/FerretDB/internal/handlers/commonerrors"
"github.com/FerretDB/FerretDB/internal/types"
"github.com/FerretDB/FerretDB/internal/util/iterator"
"github.com/FerretDB/FerretDB/internal/util/lazyerrors"
)
// sort represents $sort stage.
type sort struct {
fields *types.Document
}
// newSort creates a new $sort stage.
func newSort(stage *types.Document) (aggregations.Stage, error) {
fields, err := common.GetRequiredParam[*types.Document](stage, "$sort")
if err != nil {
return nil, commonerrors.NewCommandErrorMsgWithArgument(
commonerrors.ErrSortBadExpression,
"the $sort key specification must be an object",
"$sort (stage)",
)
}
if fields.Len() == 0 {
return nil, commonerrors.NewCommandErrorMsgWithArgument(
commonerrors.ErrSortMissingKey,
"$sort stage must have at least one sort key",
"$sort (stage)",
)
}
// TODO https://github.com/FerretDB/FerretDB/issues/2090
return &sort{
fields: fields,
}, nil
}
// Process implements Stage interface.
//
// If sort path is invalid, it returns a possibly wrapped types.PathError.
func (s *sort) Process(ctx context.Context, iter types.DocumentsIterator, closer *iterator.MultiCloser) (types.DocumentsIterator, error) { //nolint:lll // for readability
iter, err := common.SortIterator(iter, closer, s.fields)
if err != nil {
// TODO https://github.com/FerretDB/FerretDB/issues/3125
var pathErr *types.PathError
if errors.As(err, &pathErr) && pathErr.Code() == types.ErrPathElementEmpty {
return nil, commonerrors.NewCommandErrorMsgWithArgument(
commonerrors.ErrPathContainsEmptyElement,
"FieldPath field names may not be empty strings.",
"$sort (stage)",
)
}
return nil, lazyerrors.Error(err)
}
return iter, nil
}
// check interfaces
var (
_ aggregations.Stage = (*sort)(nil)
)