| /* |
| * 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 etcd |
| |
| import ( |
| "context" |
| "fmt" |
| "strings" |
| |
| "github.com/apache/servicecomb-service-center/datasource/etcd/state/kvstore" |
| "github.com/apache/servicecomb-service-center/datasource/etcd/state/parser" |
| "github.com/apache/servicecomb-service-center/pkg/log" |
| "github.com/apache/servicecomb-service-center/pkg/util" |
| "github.com/little-cui/etcdadpt" |
| ) |
| |
| // Indexer implements kvstore.Indexer. |
| // Indexer searches data from etcd server. |
| type Indexer struct { |
| Client etcdadpt.Client |
| Parser parser.Parser |
| Root string |
| } |
| |
| func (i *Indexer) CheckPrefix(key string) error { |
| if strings.Index(key, i.Root) != 0 { |
| return fmt.Errorf("search '%s' mismatch pattern %s", key, i.Root) |
| } |
| return nil |
| } |
| |
| func (i *Indexer) Search(ctx context.Context, opts ...etcdadpt.OpOption) (r *kvstore.Response, err error) { |
| op := etcdadpt.OpGet(opts...) |
| key := util.BytesToStringWithNoCopy(op.Key) |
| |
| log.Debug(fmt.Sprintf("search '%s' match special options, request etcd server, opts: %s", key, op)) |
| |
| if err := i.CheckPrefix(key); err != nil { |
| return nil, err |
| } |
| |
| resp, err := i.Client.Do(ctx, opts...) |
| if err != nil { |
| return nil, err |
| } |
| |
| r = new(kvstore.Response) |
| r.Count = resp.Count |
| if len(resp.Kvs) == 0 || op.CountOnly { |
| return |
| } |
| |
| p := i.Parser |
| if op.KeyOnly { |
| p = nil |
| } |
| |
| kvs := make([]*kvstore.KeyValue, 0, len(resp.Kvs)) |
| for _, src := range resp.Kvs { |
| kv := kvstore.NewKeyValue() |
| if err = FromEtcdKeyValue(kv, src, p); err != nil { |
| continue |
| } |
| kvs = append(kvs, kv) |
| } |
| r.Kvs = kvs |
| return |
| } |
| |
| // Creditable implements kvstore.Indexer#Creditable. |
| func (i *Indexer) Creditable() bool { |
| return true |
| } |
| |
| func NewEtcdIndexer(root string, p parser.Parser) (indexer *Indexer) { |
| return &Indexer{Client: etcdadpt.Instance(), Parser: p, Root: root} |
| } |