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migrator.go
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/
migrator.go
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package migrator
import (
"time"
_ "github.com/go-sql-driver/mysql"
"github.com/go-xorm/xorm"
"github.com/grafana/grafana/pkg/log"
_ "github.com/lib/pq"
_ "github.com/mattn/go-sqlite3"
)
type Migrator struct {
x *xorm.Engine
dialect Dialect
migrations []Migration
Logger log.Logger
}
type MigrationLog struct {
Id int64
MigrationId string
Sql string
Success bool
Error string
Timestamp time.Time
}
func NewMigrator(engine *xorm.Engine) *Migrator {
mg := &Migrator{}
mg.x = engine
mg.Logger = log.New("migrator")
mg.migrations = make([]Migration, 0)
mg.dialect = NewDialect(mg.x)
return mg
}
func (mg *Migrator) MigrationsCount() int {
return len(mg.migrations)
}
func (mg *Migrator) AddMigration(id string, m Migration) {
m.SetId(id)
mg.migrations = append(mg.migrations, m)
}
func (mg *Migrator) GetMigrationLog() (map[string]MigrationLog, error) {
logMap := make(map[string]MigrationLog)
logItems := make([]MigrationLog, 0)
exists, err := mg.x.IsTableExist(new(MigrationLog))
if err != nil {
return nil, err
}
if !exists {
return logMap, nil
}
if err = mg.x.Find(&logItems); err != nil {
return nil, err
}
for _, logItem := range logItems {
if !logItem.Success {
continue
}
logMap[logItem.MigrationId] = logItem
}
return logMap, nil
}
func (mg *Migrator) Start() error {
mg.Logger.Info("Starting DB migration")
logMap, err := mg.GetMigrationLog()
if err != nil {
return err
}
for _, m := range mg.migrations {
_, exists := logMap[m.Id()]
if exists {
mg.Logger.Debug("Skipping migration: Already executed", "id", m.Id())
continue
}
sql := m.Sql(mg.dialect)
record := MigrationLog{
MigrationId: m.Id(),
Sql: sql,
Timestamp: time.Now(),
}
mg.Logger.Debug("Executing", "sql", sql)
err := mg.inTransaction(func(sess *xorm.Session) error {
err := mg.exec(m, sess)
if err != nil {
mg.Logger.Error("Exec failed", "error", err, "sql", sql)
record.Error = err.Error()
sess.Insert(&record)
return err
}
record.Success = true
sess.Insert(&record)
return nil
})
if err != nil {
return err
}
}
return nil
}
func (mg *Migrator) exec(m Migration, sess *xorm.Session) error {
mg.Logger.Info("Executing migration", "id", m.Id())
condition := m.GetCondition()
if condition != nil {
sql, args := condition.Sql(mg.dialect)
results, err := sess.SQL(sql).Query(args...)
if err != nil || len(results) == 0 {
mg.Logger.Debug("Skipping migration condition not fulfilled", "id", m.Id())
return sess.Rollback()
}
}
_, err := sess.Exec(m.Sql(mg.dialect))
if err != nil {
mg.Logger.Error("Executing migration failed", "id", m.Id(), "error", err)
return err
}
return nil
}
type dbTransactionFunc func(sess *xorm.Session) error
func (mg *Migrator) inTransaction(callback dbTransactionFunc) error {
var err error
sess := mg.x.NewSession()
defer sess.Close()
if err = sess.Begin(); err != nil {
return err
}
err = callback(sess)
if err != nil {
sess.Rollback()
return err
} else if err = sess.Commit(); err != nil {
return err
}
return nil
}