Fix passing default grpc call options in Kubernetes client

Signed-off-by: Marek Siarkowicz <siarkowicz@google.com>

client/v3/kubernetes/client.go

@@ -16,6 +16,7 @@ package kubernetes
 
 import (
 	"context"
+	"fmt"
 
 	pb "go.etcd.io/etcd/api/v3/etcdserverpb"
 	"go.etcd.io/etcd/api/v3/mvccpb"
@@ -31,7 +32,6 @@ func New(cfg clientv3.Config) (*Client, error) {
 	}
 	kc := &Client{
 		Client: c,
-		kv:     clientv3.RetryKVClient(c),
 	}
 	kc.Kubernetes = kc
 	return kc, nil
@@ -40,15 +40,14 @@ func New(cfg clientv3.Config) (*Client, error) {
 type Client struct {
 	*clientv3.Client
 	Kubernetes Interface
-	kv         pb.KVClient
 }
 
 var _ Interface = (*Client)(nil)
 
 func (k Client) Get(ctx context.Context, key string, opts GetOptions) (resp GetResponse, err error) {
-	rangeResp, err := k.kv.Range(ctx, getRequest(key, opts.Revision))
+	rangeResp, err := k.KV.Get(ctx, key, clientv3.WithRev(opts.Revision), clientv3.WithLimit(1))
 	if err != nil {
-		return resp, clientv3.ContextError(ctx, err)
+		return resp, err
 	}
 	resp.Revision = rangeResp.Header.Revision
 	if len(rangeResp.Kvs) == 1 {
@@ -58,17 +57,14 @@ func (k Client) Get(ctx context.Context, key string, opts GetOptions) (resp GetR
 }
 
 func (k Client) List(ctx context.Context, prefix string, opts ListOptions) (resp ListResponse, err error) {
-	rangeStart := prefix + opts.Continue
+	rangeStart := prefix
+	if opts.Continue != "" {
+		rangeStart = opts.Continue
+	}
 	rangeEnd := clientv3.GetPrefixRangeEnd(prefix)
-
-	rangeResp, err := k.kv.Range(ctx, &pb.RangeRequest{
-		Key:      []byte(rangeStart),
-		RangeEnd: []byte(rangeEnd),
-		Limit:    opts.Limit,
-		Revision: opts.Revision,
-	})
+	rangeResp, err := k.KV.Get(ctx, rangeStart, clientv3.WithRange(rangeEnd), clientv3.WithLimit(opts.Limit), clientv3.WithRev(opts.Revision))
 	if err != nil {
-		return resp, clientv3.ContextError(ctx, err)
+		return resp, err
 	}
 	resp.Kvs = rangeResp.Kvs
 	resp.Count = rangeResp.Count
@@ -77,48 +73,51 @@ func (k Client) List(ctx context.Context, prefix string, opts ListOptions) (resp
 }
 
 func (k Client) Count(ctx context.Context, prefix string, _ CountOptions) (int64, error) {
-	resp, err := k.kv.Range(ctx, &pb.RangeRequest{
-		Key:       []byte(prefix),
-		RangeEnd:  []byte(clientv3.GetPrefixRangeEnd(prefix)),
-		CountOnly: true,
-	})
+	resp, err := k.KV.Get(ctx, prefix, clientv3.WithPrefix(), clientv3.WithCountOnly())
 	if err != nil {
-		return 0, clientv3.ContextError(ctx, err)
+		return 0, err
 	}
 	return resp.Count, nil
 }
 
 func (k Client) OptimisticPut(ctx context.Context, key string, value []byte, expectedRevision int64, opts PutOptions) (resp PutResponse, err error) {
-	onSuccess := &pb.RequestOp{Request: &pb.RequestOp_RequestPut{RequestPut: &pb.PutRequest{Key: []byte(key), Value: value, Lease: int64(opts.LeaseID)}}}
+	txn := k.KV.Txn(ctx).If(
+		clientv3.Compare(clientv3.ModRevision(key), "=", expectedRevision),
+	).Then(
+		clientv3.OpPut(key, string(value), clientv3.WithLease(opts.LeaseID)),
+	)
 
-	var onFailure *pb.RequestOp
 	if opts.GetOnFailure {
-		onFailure = &pb.RequestOp{Request: &pb.RequestOp_RequestRange{RequestRange: getRequest(key, 0)}}
+		txn = txn.Else(clientv3.OpGet(key))
 	}
 
-	txnResp, err := k.optimisticTxn(ctx, key, expectedRevision, onSuccess, onFailure)
+	txnResp, err := txn.Commit()
 	if err != nil {
-		return resp, clientv3.ContextError(ctx, err)
+		return resp, err
 	}
 	resp.Succeeded = txnResp.Succeeded
 	resp.Revision = txnResp.Header.Revision
 	if opts.GetOnFailure && !txnResp.Succeeded {
+		if len(txnResp.Responses) == 0 {
+			return resp, fmt.Errorf("invalid OptimisticPut response: %v", txnResp.Responses)
+		}
 		resp.KV = kvFromTxnResponse(txnResp.Responses[0])
 	}
 	return resp, nil
 }
 
 func (k Client) OptimisticDelete(ctx context.Context, key string, expectedRevision int64, opts DeleteOptions) (resp DeleteResponse, err error) {
-	onSuccess := &pb.RequestOp{Request: &pb.RequestOp_RequestDeleteRange{RequestDeleteRange: &pb.DeleteRangeRequest{Key: []byte(key)}}}
-
-	var onFailure *pb.RequestOp
+	txn := k.KV.Txn(ctx).If(
+		clientv3.Compare(clientv3.ModRevision(key), "=", expectedRevision),
+	).Then(
+		clientv3.OpDelete(key),
+	)
 	if opts.GetOnFailure {
-		onFailure = &pb.RequestOp{Request: &pb.RequestOp_RequestRange{RequestRange: getRequest(key, 0)}}
+		txn = txn.Else(clientv3.OpGet(key))
 	}
-
-	txnResp, err := k.optimisticTxn(ctx, key, expectedRevision, onSuccess, onFailure)
+	txnResp, err := txn.Commit()
 	if err != nil {
-		return resp, clientv3.ContextError(ctx, err)
+		return resp, err
 	}
 	resp.Succeeded = txnResp.Succeeded
 	resp.Revision = txnResp.Header.Revision
@@ -128,34 +127,6 @@ func (k Client) OptimisticDelete(ctx context.Context, key string, expectedRevisi
 	return resp, nil
 }
 
-func (k Client) optimisticTxn(ctx context.Context, key string, expectedRevision int64, onSuccess, onFailure *pb.RequestOp) (*pb.TxnResponse, error) {
-	txn := &pb.TxnRequest{
-		Compare: []*pb.Compare{
-			{
-				Result:      pb.Compare_EQUAL,
-				Target:      pb.Compare_MOD,
-				Key:         []byte(key),
-				TargetUnion: &pb.Compare_ModRevision{ModRevision: expectedRevision},
-			},
-		},
-	}
-	if onSuccess != nil {
-		txn.Success = []*pb.RequestOp{onSuccess}
-	}
-	if onFailure != nil {
-		txn.Failure = []*pb.RequestOp{onFailure}
-	}
-	return k.kv.Txn(ctx, txn)
-}
-
-func getRequest(key string, revision int64) *pb.RangeRequest {
-	return &pb.RangeRequest{
-		Key:      []byte(key),
-		Revision: revision,
-		Limit:    1,
-	}
-}
-
 func kvFromTxnResponse(resp *pb.ResponseOp) *mvccpb.KeyValue {
 	getResponse := resp.GetResponseRange()
 	if len(getResponse.Kvs) == 1 {