guesstimate/internal/orm/version_resolver.go

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2020-08-08 15:04:59 +02:00
package orm
import (
"context"
"time"
"github.com/jinzhu/gorm"
"github.com/pkg/errors"
)
type VersionResolver interface {
Current(context.Context) (string, error)
Set(context.Context, string) error
}
type DBVersionResolver struct {
db *gorm.DB
}
type DatabaseVersion struct {
ID uint `gorm:"primary_key"`
Version string `gorm:"unique; not null"`
MigratedAt time.Time
IsCurrent bool
}
func (r *DBVersionResolver) Current(ctx context.Context) (string, error) {
var version string
err := WithTx(ctx, r.db, func(ctx context.Context, tx *gorm.DB) error {
dbVersion := &DatabaseVersion{}
err := tx.Where("is_current = ?", true).First(dbVersion).Error
if errors.Is(err, gorm.ErrRecordNotFound) {
return nil
}
if err != nil {
return errors.WithStack(err)
}
version = dbVersion.Version
return nil
})
if err != nil {
return "", errors.Wrap(err, "could execute version resolver init transaction")
}
return version, nil
}
func (r *DBVersionResolver) Set(ctx context.Context, version string) error {
err := WithTx(ctx, r.db, func(ctx context.Context, tx *gorm.DB) error {
dbVersion := &DatabaseVersion{
Version: version,
MigratedAt: time.Now(),
}
if version != "" {
if err := tx.FirstOrCreate(dbVersion).Error; err != nil {
return err
}
err := tx.Model(dbVersion).
UpdateColumn("is_current", true).Error
if err != nil {
return errors.WithStack(err)
}
}
err := tx.Model(&DatabaseVersion{}).
Where("version <> ?", version).
UpdateColumn("is_current", false).Error
if err != nil {
return errors.WithStack(err)
}
return err
})
if err != nil {
return errors.Wrap(err, "could not update schema version")
}
return nil
}
func (r *DBVersionResolver) Init(ctx context.Context) error {
err := WithTx(ctx, r.db, func(ctx context.Context, tx *gorm.DB) error {
if err := tx.AutoMigrate(&DatabaseVersion{}).Error; err != nil {
return errors.WithStack(err)
}
if err := tx.Model(&DatabaseVersion{}).AddUniqueIndex("idx_unique_version", "version").Error; err != nil {
return errors.WithStack(err)
}
return nil
})
if err != nil {
return errors.Wrap(err, "could execute version resolver init transaction")
}
return nil
}
func NewDBVersionResolver(db *gorm.DB) *DBVersionResolver {
return &DBVersionResolver{
db: db,
}
}