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delete.go
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delete.go
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package server
import (
"context"
"go.etcd.io/etcd/api/v3/etcdserverpb"
)
func isDelete(txn *etcdserverpb.TxnRequest) (int64, string, bool) {
if len(txn.Compare) == 0 &&
len(txn.Failure) == 0 &&
len(txn.Success) == 2 &&
txn.Success[0].GetRequestRange() != nil &&
txn.Success[1].GetRequestDeleteRange() != nil {
rng := txn.Success[1].GetRequestDeleteRange()
return 0, string(rng.Key), true
}
if len(txn.Compare) == 1 &&
txn.Compare[0].Target == etcdserverpb.Compare_MOD &&
txn.Compare[0].Result == etcdserverpb.Compare_EQUAL &&
len(txn.Failure) == 1 &&
txn.Failure[0].GetRequestRange() != nil &&
len(txn.Success) == 1 &&
txn.Success[0].GetRequestDeleteRange() != nil {
return txn.Compare[0].GetModRevision(), string(txn.Success[0].GetRequestDeleteRange().Key), true
}
return 0, "", false
}
func (l *LimitedServer) delete(ctx context.Context, key string, revision int64) (*etcdserverpb.TxnResponse, error) {
rev, kv, ok, err := l.backend.Delete(ctx, key, revision)
if err != nil {
return nil, err
}
if !ok {
return &etcdserverpb.TxnResponse{
Header: txnHeader(rev),
Responses: []*etcdserverpb.ResponseOp{
{
Response: &etcdserverpb.ResponseOp_ResponseRange{
ResponseRange: &etcdserverpb.RangeResponse{
Header: txnHeader(rev),
Kvs: toKVs(kv),
Count: 1,
},
},
},
},
Succeeded: false,
}, nil
}
return &etcdserverpb.TxnResponse{
Header: txnHeader(rev),
Responses: []*etcdserverpb.ResponseOp{
{
Response: &etcdserverpb.ResponseOp_ResponseDeleteRange{
ResponseDeleteRange: &etcdserverpb.DeleteRangeResponse{
Header: txnHeader(rev),
PrevKvs: toKVs(kv),
},
},
},
},
Succeeded: true,
}, nil
}