-
Notifications
You must be signed in to change notification settings - Fork 92
/
show_table_status.go
118 lines (99 loc) · 3.06 KB
/
show_table_status.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
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 dal
import (
"context"
"strings"
"sync"
)
import (
"github.com/pkg/errors"
)
import (
"github.com/arana-db/arana/pkg/dataset"
"github.com/arana-db/arana/pkg/mysql/rows"
"github.com/arana-db/arana/pkg/proto"
"github.com/arana-db/arana/pkg/proto/rule"
"github.com/arana-db/arana/pkg/resultx"
"github.com/arana-db/arana/pkg/runtime/ast"
"github.com/arana-db/arana/pkg/runtime/plan"
)
var _ proto.Plan = (*ShowTableStatusPlan)(nil)
type ShowTableStatusPlan struct {
plan.BasePlan
Database string
Stmt *ast.ShowTableStatus
Shards rule.DatabaseTables
}
func (s *ShowTableStatusPlan) Type() proto.PlanType {
return proto.PlanTypeQuery
}
func (s *ShowTableStatusPlan) ExecIn(ctx context.Context, conn proto.VConn) (proto.Result, error) {
var (
sb strings.Builder
args []int
)
ctx, span := plan.Tracer.Start(ctx, "ShowTableStatusPlan.ExecIn")
defer span.End()
if err := s.Stmt.Restore(ast.RestoreDefault, &sb, &args); err != nil {
return nil, errors.WithStack(err)
}
db, table := s.Shards.Smallest()
if db == "" || table == "" {
return nil, errors.New("no found db or table")
}
toTable := table[:strings.LastIndex(table, "_")]
toSql := strings.ReplaceAll(sb.String(), s.Database, db)
toSql = strings.ReplaceAll(toSql, toTable, table)
query, err := conn.Query(ctx, "", toSql, s.ToArgs(args)...)
if err != nil {
return nil, errors.WithStack(err)
}
ds, err := query.Dataset()
if err != nil {
return nil, errors.WithStack(err)
}
fields, err := ds.Fields()
if err != nil {
return nil, errors.WithStack(err)
}
sm := sync.Map{}
ds = dataset.Pipe(ds, dataset.Map(nil, func(next proto.Row) (proto.Row, error) {
dest := make([]proto.Value, len(fields))
if next.Scan(dest) != nil {
return next, nil
}
if strings.HasPrefix(dest[0].String(), toTable) {
dest[0] = proto.NewValueString(toTable)
}
if next.IsBinary() {
return rows.NewBinaryVirtualRow(fields, dest), nil
}
return rows.NewTextVirtualRow(fields, dest), nil
}), dataset.FilterPrefix(func(next proto.Row) bool {
dest := make([]proto.Value, len(fields))
if next.Scan(dest) != nil {
return false
}
if _, ok := sm.Load(dest[0]); ok {
return false
}
sm.Store(dest[0], "")
return true
}, systemTablePrefix))
return resultx.New(resultx.WithDataset(ds)), nil
}