| // Copyright 2017 The etcd 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 leasing |
| |
| import ( |
| "bytes" |
| |
| v3 "github.com/coreos/etcd/clientv3" |
| v3pb "github.com/coreos/etcd/etcdserver/etcdserverpb" |
| ) |
| |
| func compareInt64(a, b int64) int { |
| switch { |
| case a < b: |
| return -1 |
| case a > b: |
| return 1 |
| default: |
| return 0 |
| } |
| } |
| |
| func evalCmp(resp *v3.GetResponse, tcmp v3.Cmp) bool { |
| var result int |
| if len(resp.Kvs) != 0 { |
| kv := resp.Kvs[0] |
| switch tcmp.Target { |
| case v3pb.Compare_VALUE: |
| if tv, _ := tcmp.TargetUnion.(*v3pb.Compare_Value); tv != nil { |
| result = bytes.Compare(kv.Value, tv.Value) |
| } |
| case v3pb.Compare_CREATE: |
| if tv, _ := tcmp.TargetUnion.(*v3pb.Compare_CreateRevision); tv != nil { |
| result = compareInt64(kv.CreateRevision, tv.CreateRevision) |
| } |
| case v3pb.Compare_MOD: |
| if tv, _ := tcmp.TargetUnion.(*v3pb.Compare_ModRevision); tv != nil { |
| result = compareInt64(kv.ModRevision, tv.ModRevision) |
| } |
| case v3pb.Compare_VERSION: |
| if tv, _ := tcmp.TargetUnion.(*v3pb.Compare_Version); tv != nil { |
| result = compareInt64(kv.Version, tv.Version) |
| } |
| } |
| } |
| switch tcmp.Result { |
| case v3pb.Compare_EQUAL: |
| return result == 0 |
| case v3pb.Compare_NOT_EQUAL: |
| return result != 0 |
| case v3pb.Compare_GREATER: |
| return result > 0 |
| case v3pb.Compare_LESS: |
| return result < 0 |
| } |
| return true |
| } |
| |
| func gatherOps(ops []v3.Op) (ret []v3.Op) { |
| for _, op := range ops { |
| if !op.IsTxn() { |
| ret = append(ret, op) |
| continue |
| } |
| _, thenOps, elseOps := op.Txn() |
| ret = append(ret, gatherOps(append(thenOps, elseOps...))...) |
| } |
| return ret |
| } |
| |
| func gatherResponseOps(resp []*v3pb.ResponseOp, ops []v3.Op) (ret []v3.Op) { |
| for i, op := range ops { |
| if !op.IsTxn() { |
| ret = append(ret, op) |
| continue |
| } |
| _, thenOps, elseOps := op.Txn() |
| if txnResp := resp[i].GetResponseTxn(); txnResp.Succeeded { |
| ret = append(ret, gatherResponseOps(txnResp.Responses, thenOps)...) |
| } else { |
| ret = append(ret, gatherResponseOps(txnResp.Responses, elseOps)...) |
| } |
| } |
| return ret |
| } |
| |
| func copyHeader(hdr *v3pb.ResponseHeader) *v3pb.ResponseHeader { |
| h := *hdr |
| return &h |
| } |
| |
| func closeAll(chs []chan<- struct{}) { |
| for _, ch := range chs { |
| close(ch) |
| } |
| } |