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database.go
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database.go
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package go_migrate
import (
"context"
"database/sql"
"time"
"github.com/mdobak/go-xerrors"
)
type sqldb interface {
QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error)
ExecContext(ctx context.Context, query string, args ...interface{}) (sql.Result, error)
}
type sqldbBeginTx interface {
BeginTx(ctx context.Context, opts *sql.TxOptions) (*sql.Tx, error)
}
type sqldbTX interface {
Commit() error
Rollback() error
}
const (
selectMigrationsSQL = `SELECT * FROM migrations ORDER BY "version" ASC`
insertMigrationSQL = `INSERT INTO migrations ("version", "timestamp") VALUES ($1, $2)`
deleteMigrationSQL = `DELETE FROM migrations WHERE "version" = $1`
createTableSQL = `
CREATE TABLE IF NOT EXISTS migrations (
"version" bigint NOT NULL,
"timestamp" timestamp NOT NULL,
PRIMARY KEY ("version")
)`
)
type SQLDatabase struct {
sqldb sqldb
inited bool
}
type migration struct {
Version int `db:"version"`
Timestamp time.Time `db:"timestamp"`
}
func NewSQLDatabase(sqldb sqldb) *SQLDatabase {
return &SQLDatabase{sqldb: sqldb}
}
func (s *SQLDatabase) List(ctx context.Context) ([]int, error) {
if err := s.init(ctx); err != nil {
return nil, err
}
var ms []*migration
rows, err := s.sqldb.QueryContext(ctx, selectMigrationsSQL)
defer rows.Close()
if err != nil {
return nil, err
}
for rows.Next() {
m := &migration{}
if err := rows.Scan(&m.Version, &m.Timestamp); err != nil {
return nil, err
}
ms = append(ms, m)
}
if err != nil {
return nil, err
}
var vs []int
for _, m := range ms {
vs = append(vs, m.Version)
}
return vs, nil
}
func (s *SQLDatabase) Migrate(ctx context.Context, actions []Action) error {
if err := s.init(ctx); err != nil {
return err
}
for _, action := range actions {
var err error
switch action.Direction {
case Up:
err = s.up(ctx, action)
case Down:
err = s.down(ctx, action)
}
if err != nil {
return err
}
}
return nil
}
func (s *SQLDatabase) up(ctx context.Context, action Action) error {
return transaction(ctx, s.sqldb, func(db sqldb) error {
_, err := db.ExecContext(ctx, action.Migration)
if err != nil {
return err
}
_, err = db.ExecContext(ctx, insertMigrationSQL, action.Version, time.Now())
return err
})
}
func (s *SQLDatabase) down(ctx context.Context, action Action) error {
return transaction(ctx, s.sqldb, func(db sqldb) error {
_, err := db.ExecContext(ctx, action.Migration)
if err != nil {
return err
}
_, err = db.ExecContext(ctx, deleteMigrationSQL, action.Version)
return err
})
}
func (s *SQLDatabase) init(ctx context.Context) error {
if s.inited {
return nil
}
s.inited = true
_, err := s.sqldb.ExecContext(ctx, createTableSQL)
return err
}
func transaction(ctx context.Context, sqldb sqldb, fn func(db sqldb) error) (err error) {
if sqldb, ok := sqldb.(sqldbBeginTx); ok {
tx, err := sqldb.BeginTx(ctx, nil)
if err != nil {
return err
}
defer func() {
if r := recover(); r != nil {
err = xerrors.Append(err, xerrors.FromRecover(r))
}
if err != nil {
rerr := tx.Rollback()
if rerr != nil {
err = xerrors.Append(err, rerr)
}
}
}()
err = fn(tx)
if err != nil {
return err
}
return tx.Commit()
}
return fn(sqldb)
}