util.go

Documentation: go.etcd.io/etcd/client/v3/leasing

     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  	v3pb "go.etcd.io/etcd/api/v3/etcdserverpb"
    21  	v3 "go.etcd.io/etcd/client/v3"
    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  }
   109
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