blob: bb2794828b96e649702d2743557cdfcb84922b66 [file] [log] [blame]
// Copyright 2015 The LUCI Authors.
//
// 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 mutate
import (
"context"
"go.chromium.org/luci/common/logging"
"go.chromium.org/luci/dm/appengine/model"
ds "go.chromium.org/luci/gae/service/datastore"
"go.chromium.org/luci/tumble"
)
// MergeQuest ensures that the given Quest exists and contains the merged
// set of BuiltBy entries.
type MergeQuest struct {
Quest *model.Quest
AndThen []tumble.Mutation
}
// Root implements tumble.Mutation.
func (m *MergeQuest) Root(c context.Context) *ds.Key {
return model.QuestKeyFromID(c, m.Quest.ID)
}
// RollForward implements tumble.Mutation.
func (m *MergeQuest) RollForward(c context.Context) (muts []tumble.Mutation, err error) {
curQuest := model.QuestFromID(m.Quest.ID)
c = logging.SetField(c, "qid", m.Quest.ID)
reason := "getting quest"
switch err = ds.Get(c, curQuest); err {
case nil:
prevLen := len(curQuest.BuiltBy)
curQuest.BuiltBy.Add(m.Quest.BuiltBy...)
if len(curQuest.BuiltBy) > prevLen {
reason = "putting merged quest"
err = ds.Put(c, curQuest)
}
case ds.ErrNoSuchEntity:
reason = "putting quest"
err = ds.Put(c, m.Quest)
}
if err != nil {
logging.WithError(err).Errorf(c, "%s", reason)
}
muts = m.AndThen
return
}
func init() {
tumble.Register((*MergeQuest)(nil))
}