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msg_count.go
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/
msg_count.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 sqlite
import (
"context"
"errors"
"fmt"
"github.com/FerretDB/FerretDB/internal/backends"
"github.com/FerretDB/FerretDB/internal/handlers/common"
"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"
"github.com/FerretDB/FerretDB/internal/util/must"
"github.com/FerretDB/FerretDB/internal/wire"
)
// MsgCount implements HandlerInterface.
func (h *Handler) MsgCount(ctx context.Context, msg *wire.OpMsg) (*wire.OpMsg, error) {
document, err := msg.Document()
if err != nil {
return nil, lazyerrors.Error(err)
}
params, err := common.GetCountParams(document, h.L)
if err != nil {
return nil, err
}
db, err := h.b.Database(params.DB)
if err != nil {
if backends.ErrorCodeIs(err, backends.ErrorCodeDatabaseNameIsInvalid) {
msg := fmt.Sprintf("Invalid namespace specified '%s.%s'", params.DB, params.Collection)
return nil, commonerrors.NewCommandErrorMsgWithArgument(commonerrors.ErrInvalidNamespace, msg, "count")
}
return nil, lazyerrors.Error(err)
}
c, err := db.Collection(params.Collection)
if err != nil {
if backends.ErrorCodeIs(err, backends.ErrorCodeCollectionNameIsInvalid) {
msg := fmt.Sprintf("Invalid collection name: %s", params.Collection)
return nil, commonerrors.NewCommandErrorMsgWithArgument(commonerrors.ErrInvalidNamespace, msg, "count")
}
return nil, lazyerrors.Error(err)
}
var qp backends.QueryParams
if !h.DisableFilterPushdown {
qp.Filter = params.Filter
}
queryRes, err := c.Query(ctx, &qp)
if err != nil {
return nil, lazyerrors.Error(err)
}
iter := queryRes.Iter
closer := iterator.NewMultiCloser(iter)
defer closer.Close()
iter = common.FilterIterator(iter, closer, params.Filter)
iter = common.SkipIterator(iter, closer, params.Skip)
iter = common.LimitIterator(iter, closer, params.Limit)
iter = common.CountIterator(iter, closer, "count")
_, res, err := iter.Next()
if errors.Is(err, iterator.ErrIteratorDone) {
err = nil
}
if err != nil {
return nil, lazyerrors.Error(err)
}
count, _ := res.Get("count")
n, _ := count.(int32)
var reply wire.OpMsg
must.NoError(reply.SetSections(wire.OpMsgSection{
Documents: []*types.Document{must.NotFail(types.NewDocument(
"n", n,
"ok", float64(1),
))},
}))
return &reply, nil
}