forked from sampork/go-sniffer
/
msg_distinct.go
95 lines (78 loc) · 3.03 KB
/
msg_distinct.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
// 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 handler
import (
"context"
"fmt"
"github.com/40t/go-sniffer/plugSrc/mongodb/build/FerretDB-internal/backends"
"github.com/40t/go-sniffer/plugSrc/mongodb/build/FerretDB-internal/handler/common"
"github.com/40t/go-sniffer/plugSrc/mongodb/build/FerretDB-internal/handler/handlererrors"
"github.com/40t/go-sniffer/plugSrc/mongodb/build/FerretDB-internal/types"
"github.com/40t/go-sniffer/plugSrc/mongodb/build/FerretDB-internal/util/iterator"
"github.com/40t/go-sniffer/plugSrc/mongodb/build/FerretDB-internal/util/lazyerrors"
"github.com/40t/go-sniffer/plugSrc/mongodb/build/FerretDB-internal/util/must"
"github.com/40t/go-sniffer/plugSrc/mongodb/build/FerretDB-internal/wire"
)
// MsgDistinct implements `distinct` command.
func (h *Handler) MsgDistinct(ctx context.Context, msg *wire.OpMsg) (*wire.OpMsg, error) {
document, err := msg.Document()
if err != nil {
return nil, lazyerrors.Error(err)
}
params, err := common.GetDistinctParams(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, handlererrors.NewCommandErrorMsgWithArgument(handlererrors.ErrInvalidNamespace, msg, document.Command())
}
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, handlererrors.NewCommandErrorMsgWithArgument(handlererrors.ErrInvalidNamespace, msg, document.Command())
}
return nil, lazyerrors.Error(err)
}
closer := iterator.NewMultiCloser()
defer closer.Close()
var qp backends.QueryParams
if !h.DisablePushdown {
qp.Filter = params.Filter
}
// TODO https://github.com/FerretDB/FerretDB/issues/3235
queryRes, err := c.Query(ctx, &qp)
if err != nil {
return nil, lazyerrors.Error(err)
}
closer.Add(queryRes.Iter)
iter := common.FilterIterator(queryRes.Iter, closer, params.Filter)
distinct, err := common.FilterDistinctValues(iter, params.Key)
if err != nil {
return nil, lazyerrors.Error(err)
}
var reply wire.OpMsg
must.NoError(reply.SetSections(wire.OpMsgSection{
Documents: []*types.Document{must.NotFail(types.NewDocument(
"values", distinct,
"ok", float64(1),
))},
}))
return &reply, nil
}