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migrator.go
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/
migrator.go
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package sqlite
import (
"context"
"database/sql"
"fmt"
"strings"
_ "github.com/golang-migrate/migrate/v4/source/file" // indirect import required by golang-migrate package
"github.com/sirupsen/logrus"
"github.com/operator-framework/operator-registry/pkg/sqlite/migrations"
)
type Migrator interface {
Migrate(ctx context.Context) error
Up(ctx context.Context, migrations migrations.Migrations) error
Down(ctx context.Context, migrations migrations.Migrations) error
}
type SQLLiteMigrator struct {
db *sql.DB
migrationsTable string
migrations migrations.MigrationSet
}
var _ Migrator = &SQLLiteMigrator{}
const (
DefaultMigrationsTable = "schema_migrations"
NilVersion = -1
)
// NewSQLLiteMigrator returns a SQLLiteMigrator.
func NewSQLLiteMigrator(db *sql.DB) (Migrator, error) {
return &SQLLiteMigrator{
db: db,
migrationsTable: DefaultMigrationsTable,
migrations: migrations.All(),
}, nil
}
// Migrate gets the current version from the database, the latest version from the migrations,
// and migrates up the the latest
func (m *SQLLiteMigrator) Migrate(ctx context.Context) error {
tx, err := m.db.Begin()
if err != nil {
return err
}
defer func() {
if err := tx.Rollback(); err != nil && !strings.Contains(err.Error(), "transaction has already been committed") {
logrus.WithError(err).Warnf("couldn't rollback")
}
}()
version, err := m.version(ctx, tx)
if err != nil {
return err
}
if err := tx.Commit(); err != nil {
return tx.Rollback()
}
return m.Up(ctx, m.migrations.From(version+1))
}
// Up runs a specific set of migrations.
func (m *SQLLiteMigrator) Up(ctx context.Context, migrations migrations.Migrations) error {
tx, err := m.db.Begin()
if err != nil {
return err
}
var commitErr error
defer func() {
if commitErr == nil {
return
}
logrus.WithError(commitErr).Warningf("tx commit failed")
if err := tx.Rollback(); err != nil {
logrus.WithError(err).Warningf("couldn't rollback after failed commit")
}
}()
if err := m.ensureMigrationTable(ctx, tx); err != nil {
return err
}
for _, migration := range migrations {
current_version, err := m.version(ctx, tx)
if err != nil {
return err
}
if migration.Id != current_version+1 {
return fmt.Errorf("migration applied out of order")
}
if err := migration.Up(ctx, tx); err != nil {
return err
}
if err := m.setVersion(ctx, tx, migration.Id); err != nil {
return err
}
}
commitErr = tx.Commit()
return commitErr
}
func (m *SQLLiteMigrator) Down(ctx context.Context, migrations migrations.Migrations) error {
tx, err := m.db.Begin()
if err != nil {
return err
}
var commitErr error
defer func() {
if commitErr == nil {
return
}
logrus.WithError(commitErr).Warningf("tx commit failed")
if err := tx.Rollback(); err != nil {
logrus.WithError(err).Warningf("couldn't rollback after failed commit")
}
}()
if err := m.ensureMigrationTable(ctx, tx); err != nil {
return err
}
for _, migration := range migrations {
current_version, err := m.version(ctx, tx)
if err != nil {
return err
}
if migration.Id != current_version {
return fmt.Errorf("migration applied out of order")
}
if err := migration.Down(ctx, tx); err != nil {
return err
}
if err := m.setVersion(ctx, tx, migration.Id-1); err != nil {
return err
}
}
commitErr = tx.Commit()
return commitErr
}
func (m *SQLLiteMigrator) ensureMigrationTable(ctx context.Context, tx *sql.Tx) error {
sql := fmt.Sprintf(`
CREATE TABLE IF NOT EXISTS %s (
version bigint NOT NULL,
timestamp DATETIME DEFAULT CURRENT_TIMESTAMP
);
`, m.migrationsTable)
_, err := tx.ExecContext(ctx, sql)
return err
}
func (m *SQLLiteMigrator) tableExists(tx *sql.Tx, table string) (bool, error) {
query := `SELECT count(*)
FROM sqlite_master
WHERE name = ?`
row := tx.QueryRow(query, table)
var count int
err := row.Scan(&count)
if err != nil {
return false, err
}
exists := count > 0
return exists, nil
}
func (m *SQLLiteMigrator) version(ctx context.Context, tx *sql.Tx) (version int, err error) {
tableExists, err := m.tableExists(tx, m.migrationsTable)
if err != nil {
return NilVersion, err
}
if !tableExists {
return NilVersion, nil
}
query := `SELECT version FROM ` + m.migrationsTable + ` LIMIT 1`
err = tx.QueryRowContext(ctx, query).Scan(&version)
switch {
case err == sql.ErrNoRows:
return NilVersion, nil
case err != nil:
return NilVersion, err
default:
return version, nil
}
}
func (m *SQLLiteMigrator) setVersion(ctx context.Context, tx *sql.Tx, version int) error {
if err := m.ensureMigrationTable(ctx, tx); err != nil {
return err
}
_, err := tx.ExecContext(ctx, "DELETE FROM "+m.migrationsTable)
if err != nil {
return err
}
_, err = tx.ExecContext(ctx, "INSERT INTO "+m.migrationsTable+"(version) values(?)", version)
return err
}