-
Notifications
You must be signed in to change notification settings - Fork 11
/
export.go
53 lines (45 loc) · 1.08 KB
/
export.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
// SPDX-FileCopyrightText: 2024 PK Lab AG <contact@pklab.io>
// SPDX-License-Identifier: MIT
package postgres
import (
"context"
"database/sql"
"fmt"
"io"
"github.com/dipdup-net/go-lib/config"
"github.com/uptrace/bun"
"github.com/uptrace/bun/dialect/pgdialect"
"github.com/uptrace/bun/driver/pgdriver"
)
type Export struct {
*bun.DB
}
func NewExport(cfg config.Database) *Export {
dsn := fmt.Sprintf(
"postgres://%s:%s@%s:%d/%s?sslmode=disable&application_name=export",
cfg.User,
cfg.Password,
cfg.Host,
cfg.Port,
cfg.Database,
)
sqldb := sql.OpenDB(pgdriver.NewConnector(pgdriver.WithDSN(dsn)))
db := bun.NewDB(sqldb, pgdialect.New())
return &Export{db}
}
func (e *Export) ToCsv(ctx context.Context, writer io.Writer, query string) error {
conn, err := e.Conn(ctx)
if err != nil {
return err
}
defer conn.Close()
rawQuery := fmt.Sprintf("COPY (%s) TO STDOUT WITH CSV HEADER", bun.Safe(query))
_, err = pgdriver.CopyTo(ctx, conn, writer, rawQuery)
return err
}
func (e *Export) Close() error {
if err := e.DB.Close(); err != nil {
return err
}
return nil
}