| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 counter |
| |
| import ( |
| "context" |
| |
| "github.com/go-chassis/cari/config" |
| "github.com/go-chassis/etcdadpt" |
| "github.com/go-chassis/openlog" |
| |
| "github.com/apache/servicecomb-kie/server/datasource" |
| "github.com/apache/servicecomb-kie/server/datasource/etcd/key" |
| ) |
| |
| const revision = "revision_counter" |
| |
| // Dao is the implementation |
| type Dao struct { |
| } |
| |
| // GetRevision return current revision number |
| func (s *Dao) GetRevision(ctx context.Context, domain string) (int64, error) { |
| kv, err := etcdadpt.Get(ctx, key.Counter(revision, domain)) |
| if err != nil { |
| openlog.Error("get error: " + err.Error()) |
| return 0, err |
| } |
| if kv == nil { |
| return 0, nil |
| } |
| return kv.Version, nil |
| } |
| |
| // ApplyRevision increase revision number and return modified value |
| func (s *Dao) ApplyRevision(ctx context.Context, domain string) (int64, error) { |
| resp, err := etcdadpt.PutBytesAndGet(ctx, key.Counter(revision, domain), nil) |
| if err != nil { |
| openlog.Error("put bytes error: " + err.Error()) |
| return 0, config.NewError(config.ErrInternal, "apply revision failed") |
| } |
| if resp.Count == 0 { |
| return 0, datasource.ErrRevisionNotExist |
| } |
| return resp.Kvs[0].Version, nil |
| } |