/
msg_delete.go
256 lines (205 loc) · 6.31 KB
/
msg_delete.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
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
// 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 pg
import (
"context"
"fmt"
"github.com/jackc/pgx/v4"
"github.com/FerretDB/FerretDB/internal/handlers/common"
"github.com/FerretDB/FerretDB/internal/handlers/pg/pgdb"
"github.com/FerretDB/FerretDB/internal/types"
"github.com/FerretDB/FerretDB/internal/util/lazyerrors"
"github.com/FerretDB/FerretDB/internal/util/must"
"github.com/FerretDB/FerretDB/internal/wire"
)
// MsgDelete implements HandlerInterface.
func (h *Handler) MsgDelete(ctx context.Context, msg *wire.OpMsg) (*wire.OpMsg, error) {
document, err := msg.Document()
if err != nil {
return nil, lazyerrors.Error(err)
}
if err := common.Unimplemented(document, "let"); err != nil {
return nil, err
}
common.Ignored(document, h.L, "writeConcern")
var deletes *types.Array
if deletes, err = common.GetOptionalParam(document, "deletes", deletes); err != nil {
return nil, err
}
ordered := true
if ordered, err = common.GetOptionalParam(document, "ordered", ordered); err != nil {
return nil, err
}
var sp pgdb.SQLParam
if sp.DB, err = common.GetRequiredParam[string](document, "$db"); err != nil {
return nil, err
}
collectionParam, err := document.Get(document.Command())
if err != nil {
return nil, err
}
var ok bool
if sp.Collection, ok = collectionParam.(string); !ok {
return nil, common.NewErrorMsg(
common.ErrBadValue,
fmt.Sprintf("collection name has invalid type %s", common.AliasFromType(collectionParam)),
)
}
// get comment from options.Delete().SetComment() method
if sp.Comment, err = common.GetOptionalParam(document, "comment", sp.Comment); err != nil {
return nil, err
}
var deleted int32
var delErrors common.WriteErrors
// process every delete filter
for i := 0; i < deletes.Len(); i++ {
// get document with filter
deleteDoc, err := common.AssertType[*types.Document](must.NotFail(deletes.Get(i)))
if err != nil {
return nil, err
}
filter, limit, err := h.prepareDeleteParams(deleteDoc)
if err != nil {
return nil, err
}
// get comment from query, e.g. db.collection.DeleteOne({"_id":"string", "$comment: "test"})
if sp.Comment, err = common.GetOptionalParam(filter, "$comment", sp.Comment); err != nil {
return nil, err
}
sp.Filter = filter
del, err := h.execDelete(ctx, &sp, filter, limit)
if err == nil {
deleted += del
continue
}
delErrors.Append(err, int32(i))
if ordered {
break
}
}
replyDoc := must.NotFail(types.NewDocument(
"ok", float64(1),
))
if len(delErrors) > 0 {
replyDoc = delErrors.Document()
}
must.NoError(replyDoc.Set("n", deleted))
var reply wire.OpMsg
err = reply.SetSections(wire.OpMsgSection{
Documents: []*types.Document{replyDoc},
})
if err != nil {
return nil, lazyerrors.Error(err)
}
return &reply, nil
}
// prepareDeleteParams extracts query filter and limit from delete document.
func (h *Handler) prepareDeleteParams(deleteDoc *types.Document) (*types.Document, int64, error) {
var err error
if err = common.Unimplemented(deleteDoc, "collation", "hint"); err != nil {
return nil, 0, err
}
// get filter from document
var filter *types.Document
if filter, err = common.GetOptionalParam(deleteDoc, "q", filter); err != nil {
return nil, 0, err
}
l, err := deleteDoc.Get("limit")
if err != nil {
return nil, 0, common.NewErrorMsg(
common.ErrMissingField,
"BSON field 'delete.deletes.limit' is missing but a required field",
)
}
var limit int64
if limit, err = common.GetWholeNumberParam(l); err != nil || limit < 0 || limit > 1 {
return nil, 0, common.NewErrorMsg(
common.ErrFailedToParse,
fmt.Sprintf("The limit field in delete objects must be 0 or 1. Got %v", l),
)
}
return filter, limit, nil
}
// execDelete fetches documents, filter them out and limiting with the given limit value.
// It returns the number of deleted documents or an error.
func (h *Handler) execDelete(ctx context.Context, sp *pgdb.SQLParam, filter *types.Document, limit int64) (int32, error) {
var err error
resDocs := make([]*types.Document, 0, 16)
var deleted int32
err = h.PgPool.InTransaction(ctx, func(tx pgx.Tx) error {
// fetch current items from collection
fetchedChan, err := h.PgPool.QueryDocuments(ctx, tx, sp)
if err != nil {
return err
}
defer func() {
// Drain the channel to prevent leaking goroutines.
// TODO Offer a better design instead of channels: https://github.com/FerretDB/FerretDB/issues/898.
for range fetchedChan {
}
}()
// iterate through every row and delete matching ones
for fetchedItem := range fetchedChan {
if fetchedItem.Err != nil {
return fetchedItem.Err
}
for _, doc := range fetchedItem.Docs {
matches, err := common.FilterDocument(doc, filter)
if err != nil {
return err
}
if !matches {
continue
}
resDocs = append(resDocs, doc)
}
if resDocs, err = common.LimitDocuments(resDocs, limit); err != nil {
return err
}
// if no field is matched in a row, go to the next one
if len(resDocs) == 0 {
continue
}
rowsDeleted, err := h.delete(ctx, sp, resDocs)
if err != nil {
return err
}
deleted += int32(rowsDeleted)
}
return nil
})
if err != nil {
return 0, err
}
return deleted, nil
}
// delete deletes documents by _id.
func (h *Handler) delete(ctx context.Context, sp *pgdb.SQLParam, docs []*types.Document) (int64, error) {
ids := make([]any, len(docs))
for i, doc := range docs {
id := must.NotFail(doc.Get("_id"))
ids[i] = id
}
var rowsDeleted int64
err := h.PgPool.InTransaction(ctx, func(tx pgx.Tx) error {
var err error
rowsDeleted, err = pgdb.DeleteDocumentsByID(ctx, tx, sp, ids)
return err
})
if err != nil {
// TODO check error code
return 0, common.NewError(common.ErrNamespaceNotFound, fmt.Errorf("delete: ns not found: %w", err))
}
return rowsDeleted, nil
}