| // Copyright 2016 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 tumble |
| |
| import ( |
| "context" |
| "crypto/sha256" |
| "encoding/hex" |
| |
| "go.chromium.org/luci/common/logging" |
| ds "go.chromium.org/luci/gae/service/datastore" |
| ) |
| |
| // AddToJournal records one or more Mutation to the tumble journal, but does not |
| // execute any of them. This does so by running a transaction on a pseudo-random |
| // entity group, and journaling the mutations there. |
| func AddToJournal(c context.Context, m ...Mutation) error { |
| (logging.Fields{"count": len(m)}).Infof(c, "tumble.AddToJournal") |
| if len(m) == 0 { |
| return nil |
| } |
| return RunMutation(c, addToJournalMutation(m)) |
| } |
| |
| type addToJournalMutation []Mutation |
| |
| func (a addToJournalMutation) Root(c context.Context) *ds.Key { |
| hsh := sha256.New() |
| for _, m := range a { |
| hsh.Write(ds.SerializeKC.ToBytes(m.Root(c))) |
| } |
| return ds.MakeKey(c, "tumble.temp", hex.EncodeToString(hsh.Sum(nil))) |
| } |
| |
| func (a addToJournalMutation) RollForward(c context.Context) ([]Mutation, error) { |
| return a, nil |
| } |