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db.go
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db.go
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package main
import (
"database/sql"
"errors"
"fmt"
"log"
"github.com/golang-migrate/migrate/v4"
)
type MigrationLogger struct {
Prefix string
}
func (m MigrationLogger) Printf(format string, v ...interface{}) {
log.Print(m.Prefix, fmt.Sprintf(format, v...))
}
func (m MigrationLogger) Verbose() bool {
return false
}
func connectAndMigrateDB(dbConn string) (_ *sql.DB, close func() error, err error) {
if dbConn == "" {
return nil, nil, fmt.Errorf("env var DB_CONN is not provided")
}
m, err := migrate.New("file://migrations", dbConn)
if err != nil {
return nil, nil, fmt.Errorf("create migrator: %w", err)
}
m.Log = MigrationLogger{Prefix: "migration: "}
err = m.Up()
if err != nil && !errors.Is(err, migrate.ErrNoChange) {
return nil, nil, fmt.Errorf("migrate up: %w", err)
}
close = func() error { return nil }
db, err := sql.Open("postgres", dbConn)
if err == nil {
close = db.Close
err = db.Ping()
}
if err != nil {
close()
return nil, nil, fmt.Errorf("connect to db: %w", err)
}
return db, close, nil
}