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migrator.go
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migrator.go
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package db
import (
"io/fs"
"github.com/msw-x/moon/db/migrate"
"github.com/msw-x/moon/ufmt"
"github.com/msw-x/moon/ulog"
)
type Migrator struct {
log *ulog.Log
ro bool
m *migrate.Migrator
}
func NewMigrator(d *Db) *Migrator {
o := new(Migrator)
o.log = d.log.Branch("migrator")
o.ro = d.ro
o.m = migrate.NewMigrator(d.db).WithReadonly(o.ro)
return o
}
func (o *Migrator) WithSaveDownSql(v bool) *Migrator {
o.m.WithSaveDownSql(v)
return o
}
func (o *Migrator) WithAutoDownSql(v bool) *Migrator {
o.m.WithAutoDownSql(v)
return o
}
func (o *Migrator) WithRollbackLost(v bool) *Migrator {
o.m.WithRollbackLost(v)
return o
}
func (o *Migrator) WithMarkAppliedOnSuccess(v bool) *Migrator {
o.m.WithMarkAppliedOnSuccess(v)
return o
}
func (o *Migrator) Exec(fs fs.FS, lock bool, rollbackLast bool, previewDown bool, repairDown bool) (ok bool) {
err := o.m.Init()
if err == nil {
if o.load(fs) {
if o.m.MigrationsCount() == 0 {
o.log.Info("no migrations")
ok = true
} else {
o.log.Info(o.m.Status())
if lock {
o.log.Info("locked")
} else {
switch {
case rollbackLast:
o.rollbackLast()
case previewDown:
o.previewDown()
case repairDown:
o.repairDown()
default:
ok = o.migrate()
}
}
}
}
} else {
o.log.Error("init:", err)
}
return
}
func (o *Migrator) load(fs fs.FS) bool {
err := o.m.Load(fs)
if err == nil {
o.log.Info("migrations loaded")
return true
} else {
o.log.Error("load migrations:", err)
return false
}
}
func (o *Migrator) migrate() bool {
if o.m.HasIncompleteMigrations() {
if o.ro {
return true
}
o.log.Info("migrate")
err := o.m.Migrate()
if err == nil {
o.log.Info("migrate successfully")
o.log.Info(o.m.Status())
} else {
o.log.Error("migrate:", err)
return false
}
} else {
o.log.Info("migrations are relevant")
}
return true
}
func (o *Migrator) rollbackLast() {
if o.ro {
return
}
if o.m.UnappliedMigrationsCount() == 0 {
err := o.m.RollbackLast()
if err == nil {
o.log.Info("rollback last migrations successfully")
o.log.Info(o.m.Status())
} else {
o.log.Error("rollback last migrations:", err)
}
} else {
o.log.Info("last migrations already unapplied")
}
}
func (o *Migrator) previewDown() {
name, down, err := o.m.Migrations().PreviewDown()
if err == nil {
o.log.Infof("preview migration[%s] down:\n%s", name, down)
} else {
o.log.Error(err)
}
}
func (o *Migrator) repairDown() {
o.log.Info("repair down")
l, err := o.m.RepairDown()
if err == nil {
s := ufmt.JoinSlice(l)
if s == "" {
s = "no"
}
o.log.Info("repaired down:", s)
} else {
o.log.Error(err)
}
}