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 leasing |
| 16 | |
| 17 | import ( |
| 18 | "bytes" |
| 19 | |
| 20 | v3 "github.com/coreos/etcd/clientv3" |
| 21 | v3pb "github.com/coreos/etcd/etcdserver/etcdserverpb" |
| 22 | ) |
| 23 | |
| 24 | func compareInt64(a, b int64) int { |
| 25 | switch { |
| 26 | case a < b: |
| 27 | return -1 |
| 28 | case a > b: |
| 29 | return 1 |
| 30 | default: |
| 31 | return 0 |
| 32 | } |
| 33 | } |
| 34 | |
| 35 | func evalCmp(resp *v3.GetResponse, tcmp v3.Cmp) bool { |
| 36 | var result int |
| 37 | if len(resp.Kvs) != 0 { |
| 38 | kv := resp.Kvs[0] |
| 39 | switch tcmp.Target { |
| 40 | case v3pb.Compare_VALUE: |
| 41 | if tv, _ := tcmp.TargetUnion.(*v3pb.Compare_Value); tv != nil { |
| 42 | result = bytes.Compare(kv.Value, tv.Value) |
| 43 | } |
| 44 | case v3pb.Compare_CREATE: |
| 45 | if tv, _ := tcmp.TargetUnion.(*v3pb.Compare_CreateRevision); tv != nil { |
| 46 | result = compareInt64(kv.CreateRevision, tv.CreateRevision) |
| 47 | } |
| 48 | case v3pb.Compare_MOD: |
| 49 | if tv, _ := tcmp.TargetUnion.(*v3pb.Compare_ModRevision); tv != nil { |
| 50 | result = compareInt64(kv.ModRevision, tv.ModRevision) |
| 51 | } |
| 52 | case v3pb.Compare_VERSION: |
| 53 | if tv, _ := tcmp.TargetUnion.(*v3pb.Compare_Version); tv != nil { |
| 54 | result = compareInt64(kv.Version, tv.Version) |
| 55 | } |
| 56 | } |
| 57 | } |
| 58 | switch tcmp.Result { |
| 59 | case v3pb.Compare_EQUAL: |
| 60 | return result == 0 |
| 61 | case v3pb.Compare_NOT_EQUAL: |
| 62 | return result != 0 |
| 63 | case v3pb.Compare_GREATER: |
| 64 | return result > 0 |
| 65 | case v3pb.Compare_LESS: |
| 66 | return result < 0 |
| 67 | } |
| 68 | return true |
| 69 | } |
| 70 | |
| 71 | func gatherOps(ops []v3.Op) (ret []v3.Op) { |
| 72 | for _, op := range ops { |
| 73 | if !op.IsTxn() { |
| 74 | ret = append(ret, op) |
| 75 | continue |
| 76 | } |
| 77 | _, thenOps, elseOps := op.Txn() |
| 78 | ret = append(ret, gatherOps(append(thenOps, elseOps...))...) |
| 79 | } |
| 80 | return ret |
| 81 | } |
| 82 | |
| 83 | func gatherResponseOps(resp []*v3pb.ResponseOp, ops []v3.Op) (ret []v3.Op) { |
| 84 | for i, op := range ops { |
| 85 | if !op.IsTxn() { |
| 86 | ret = append(ret, op) |
| 87 | continue |
| 88 | } |
| 89 | _, thenOps, elseOps := op.Txn() |
| 90 | if txnResp := resp[i].GetResponseTxn(); txnResp.Succeeded { |
| 91 | ret = append(ret, gatherResponseOps(txnResp.Responses, thenOps)...) |
| 92 | } else { |
| 93 | ret = append(ret, gatherResponseOps(txnResp.Responses, elseOps)...) |
| 94 | } |
| 95 | } |
| 96 | return ret |
| 97 | } |
| 98 | |
| 99 | func copyHeader(hdr *v3pb.ResponseHeader) *v3pb.ResponseHeader { |
| 100 | h := *hdr |
| 101 | return &h |
| 102 | } |
| 103 | |
| 104 | func closeAll(chs []chan<- struct{}) { |
| 105 | for _, ch := range chs { |
| 106 | close(ch) |
| 107 | } |
| 108 | } |