khenaidoo | ffe076b | 2019-01-15 16:08:08 -0500 | [diff] [blame^] | 1 | // Copyright 2017 The etcd Authors |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | package namespace |
| 16 | |
| 17 | import ( |
| 18 | "bytes" |
| 19 | "context" |
| 20 | |
| 21 | "github.com/coreos/etcd/clientv3" |
| 22 | ) |
| 23 | |
| 24 | type leasePrefix struct { |
| 25 | clientv3.Lease |
| 26 | pfx []byte |
| 27 | } |
| 28 | |
| 29 | // NewLease wraps a Lease interface to filter for only keys with a prefix |
| 30 | // and remove that prefix when fetching attached keys through TimeToLive. |
| 31 | func NewLease(l clientv3.Lease, prefix string) clientv3.Lease { |
| 32 | return &leasePrefix{l, []byte(prefix)} |
| 33 | } |
| 34 | |
| 35 | func (l *leasePrefix) TimeToLive(ctx context.Context, id clientv3.LeaseID, opts ...clientv3.LeaseOption) (*clientv3.LeaseTimeToLiveResponse, error) { |
| 36 | resp, err := l.Lease.TimeToLive(ctx, id, opts...) |
| 37 | if err != nil { |
| 38 | return nil, err |
| 39 | } |
| 40 | if len(resp.Keys) > 0 { |
| 41 | var outKeys [][]byte |
| 42 | for i := range resp.Keys { |
| 43 | if len(resp.Keys[i]) < len(l.pfx) { |
| 44 | // too short |
| 45 | continue |
| 46 | } |
| 47 | if !bytes.Equal(resp.Keys[i][:len(l.pfx)], l.pfx) { |
| 48 | // doesn't match prefix |
| 49 | continue |
| 50 | } |
| 51 | // strip prefix |
| 52 | outKeys = append(outKeys, resp.Keys[i][len(l.pfx):]) |
| 53 | } |
| 54 | resp.Keys = outKeys |
| 55 | } |
| 56 | return resp, nil |
| 57 | } |