-
Notifications
You must be signed in to change notification settings - Fork 3
/
filter.go
95 lines (80 loc) · 2.39 KB
/
filter.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
package pglogicalstream
import (
"bytes"
"encoding/json"
"fmt"
"github.com/apache/arrow/go/v14/arrow"
"github.com/apache/arrow/go/v14/arrow/array"
"github.com/apache/arrow/go/v14/arrow/memory"
"github.com/cloudquery/plugin-sdk/v4/scalar"
"github.com/usedatabrew/pglogicalstream/internal/schemas"
"strings"
)
type ChangeFilter struct {
tablesWhiteList map[string]*arrow.Schema
schemaWhiteList string
}
type Filtered func(change Wal2JsonChanges)
func NewChangeFilter(tableSchemas []schemas.DataTableSchema, schema string) ChangeFilter {
tablesMap := map[string]*arrow.Schema{}
for _, table := range tableSchemas {
tablesMap[strings.Split(table.TableName, ".")[1]] = table.Schema
}
return ChangeFilter{
tablesWhiteList: tablesMap,
schemaWhiteList: schema,
}
}
func (c ChangeFilter) FilterChange(lsn string, change []byte, OnFiltered Filtered) {
var changes WallMessage
if err := json.NewDecoder(bytes.NewReader(change)).Decode(&changes); err != nil {
panic(fmt.Errorf("cant parse change from database to filter it %v", err))
}
if len(changes.Change) == 0 {
return
}
for _, ch := range changes.Change {
var filteredChanges = Wal2JsonChanges{
Lsn: lsn,
Changes: []Wal2JsonChange{},
}
if ch.Schema != c.schemaWhiteList {
continue
}
var (
arrowTableSchema *arrow.Schema
tableExist bool
)
if arrowTableSchema, tableExist = c.tablesWhiteList[ch.Table]; !tableExist {
continue
}
builder := array.NewRecordBuilder(memory.DefaultAllocator, arrowTableSchema)
changesMap := map[string]interface{}{}
if ch.Kind == "delete" {
for i, changedValue := range ch.Oldkeys.Keyvalues {
changesMap[ch.Oldkeys.Keynames[i]] = changedValue
}
} else {
for i, changedValue := range ch.Columnvalues {
changesMap[ch.Columnnames[i]] = changedValue
}
}
arrowSchema := c.tablesWhiteList[ch.Table]
for i, arrowField := range arrowSchema.Fields() {
fieldName := arrowField.Name
value := changesMap[fieldName]
s := scalar.NewScalar(arrowSchema.Field(i).Type)
if err := s.Set(value); err != nil {
panic(fmt.Errorf("error setting value for column %s: %w", arrowField.Name, err))
}
scalar.AppendToBuilder(builder.Field(i), s)
}
filteredChanges.Changes = append(filteredChanges.Changes, Wal2JsonChange{
Kind: ch.Kind,
Schema: ch.Schema,
Table: ch.Table,
Row: builder.NewRecord(),
})
OnFiltered(filteredChanges)
}
}