guesstimate/internal/orm/migration.go

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2020-08-08 15:04:59 +02:00
package orm
import (
"context"
"github.com/jinzhu/gorm"
"github.com/pkg/errors"
"gitlab.com/wpetit/goweb/middleware/container"
)
type MigrationFunc func(ctx context.Context, tx *gorm.DB) error
type Migration interface {
Version() string
Up(context.Context) error
Down(context.Context) error
}
type DBMigration struct {
version string
up MigrationFunc
down MigrationFunc
}
func (m *DBMigration) Version() string {
return m.version
}
func (m *DBMigration) Up(ctx context.Context) error {
db, err := m.getDatabase(ctx)
if err != nil {
return err
}
err = WithTx(ctx, db, func(ctx context.Context, tx *gorm.DB) error {
return m.up(ctx, tx)
})
if err != nil {
return errors.Wrap(err, "could not apply up migration")
}
return nil
}
func (m *DBMigration) Down(ctx context.Context) error {
db, err := m.getDatabase(ctx)
if err != nil {
return err
}
err = WithTx(ctx, db, func(ctx context.Context, tx *gorm.DB) error {
return m.down(ctx, tx)
})
if err != nil {
return errors.Wrap(err, "could not apply down migration")
}
return nil
}
func (m *DBMigration) getDatabase(ctx context.Context) (*gorm.DB, error) {
ctn, err := container.From(ctx)
if err != nil {
return nil, errors.Wrap(err, "could not retrieve service container")
}
orm, err := From(ctn)
if err != nil {
return nil, errors.Wrap(err, "could not retrieve orm service")
}
return orm.DB(), nil
}
func NewDBMigration(version string, up, down MigrationFunc) *DBMigration {
return &DBMigration{
version: version,
up: up,
down: down,
}
}