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// Copyright 2020 Northern.tech AS
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package migrate
import (
"context"
"errors"
"fmt"
"go.mongodb.org/mongo-driver/mongo"
"github.com/mendersoftware/go-lib-micro/log"
)
// MigratorDummy does not actually apply migrations, just inserts the
// target version into the db to mark the initial/current state.
type DummyMigrator struct {
Client *mongo.Client
Db string
Automigrate bool
}
// Apply makes MigratorDummy implement the Migrator interface.
func (m *DummyMigrator) Apply(ctx context.Context, target Version, migrations []Migration) error {
l := log.FromContext(ctx).F(log.Ctx{"db": m.Db})
applied, err := GetMigrationInfo(ctx, m.Client, m.Db)
if err != nil {
return err
}
if len(applied) > 1 {
return errors.New("dummy migrator cannot apply migrations, more than 1 already applied")
}
last := Version{}
if len(applied) == 1 {
last = applied[0].Version
}
if !m.Automigrate {
if VersionIsLess(last, target) {
return fmt.Errorf(ErrNeedsMigration+": %s has version %s, needs version %s", m.Db, last.String(), target.String())
} else {
return nil
}
}
if VersionIsLess(last, target) {
l.Infof("applying migration from version %s to %s", last, target)
return UpdateMigrationInfo(ctx, target, m.Client, m.Db)
} else {
l.Infof("migration to version %s skipped", target)
}
return nil
}
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