// deleteRevKey deletes a key by revision, returning false if key is missing
func deleteRevKey(kvc pb.KVClient, key string, rev int64) (bool, error) {
cmp := &pb.Compare{
Result: pb.Compare_EQUAL,
Target: pb.Compare_MOD,
Key: []byte(key),
TargetUnion: &pb.Compare_ModRevision{ModRevision: rev},
}
req := &pb.RequestUnion{Request: &pb.RequestUnion_RequestDeleteRange{
RequestDeleteRange: &pb.DeleteRangeRequest{Key: []byte(key)}}}
txnresp, err := kvc.Txn(
context.TODO(),
&pb.TxnRequest{
Compare: []*pb.Compare{cmp},
Success: []*pb.RequestUnion{req},
Failure: nil,
})
if err != nil {
return false, err
} else if txnresp.Succeeded == false {
return false, nil
}
return true, nil
}
