diff --git a/vendor/github.com/coreos/etcd/proxy/grpcproxy/kv.go b/vendor/github.com/coreos/etcd/proxy/grpcproxy/kv.go
new file mode 100644
index 0000000..1c9860f
--- /dev/null
+++ b/vendor/github.com/coreos/etcd/proxy/grpcproxy/kv.go
@@ -0,0 +1,232 @@
+// Copyright 2016 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 grpcproxy
+
+import (
+	"context"
+
+	"github.com/coreos/etcd/clientv3"
+	pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
+	"github.com/coreos/etcd/proxy/grpcproxy/cache"
+)
+
+type kvProxy struct {
+	kv    clientv3.KV
+	cache cache.Cache
+}
+
+func NewKvProxy(c *clientv3.Client) (pb.KVServer, <-chan struct{}) {
+	kv := &kvProxy{
+		kv:    c.KV,
+		cache: cache.NewCache(cache.DefaultMaxEntries),
+	}
+	donec := make(chan struct{})
+	close(donec)
+	return kv, donec
+}
+
+func (p *kvProxy) Range(ctx context.Context, r *pb.RangeRequest) (*pb.RangeResponse, error) {
+	if r.Serializable {
+		resp, err := p.cache.Get(r)
+		switch err {
+		case nil:
+			cacheHits.Inc()
+			return resp, nil
+		case cache.ErrCompacted:
+			cacheHits.Inc()
+			return nil, err
+		}
+
+		cachedMisses.Inc()
+	}
+
+	resp, err := p.kv.Do(ctx, RangeRequestToOp(r))
+	if err != nil {
+		return nil, err
+	}
+
+	// cache linearizable as serializable
+	req := *r
+	req.Serializable = true
+	gresp := (*pb.RangeResponse)(resp.Get())
+	p.cache.Add(&req, gresp)
+	cacheKeys.Set(float64(p.cache.Size()))
+
+	return gresp, nil
+}
+
+func (p *kvProxy) Put(ctx context.Context, r *pb.PutRequest) (*pb.PutResponse, error) {
+	p.cache.Invalidate(r.Key, nil)
+	cacheKeys.Set(float64(p.cache.Size()))
+
+	resp, err := p.kv.Do(ctx, PutRequestToOp(r))
+	return (*pb.PutResponse)(resp.Put()), err
+}
+
+func (p *kvProxy) DeleteRange(ctx context.Context, r *pb.DeleteRangeRequest) (*pb.DeleteRangeResponse, error) {
+	p.cache.Invalidate(r.Key, r.RangeEnd)
+	cacheKeys.Set(float64(p.cache.Size()))
+
+	resp, err := p.kv.Do(ctx, DelRequestToOp(r))
+	return (*pb.DeleteRangeResponse)(resp.Del()), err
+}
+
+func (p *kvProxy) txnToCache(reqs []*pb.RequestOp, resps []*pb.ResponseOp) {
+	for i := range resps {
+		switch tv := resps[i].Response.(type) {
+		case *pb.ResponseOp_ResponsePut:
+			p.cache.Invalidate(reqs[i].GetRequestPut().Key, nil)
+		case *pb.ResponseOp_ResponseDeleteRange:
+			rdr := reqs[i].GetRequestDeleteRange()
+			p.cache.Invalidate(rdr.Key, rdr.RangeEnd)
+		case *pb.ResponseOp_ResponseRange:
+			req := *(reqs[i].GetRequestRange())
+			req.Serializable = true
+			p.cache.Add(&req, tv.ResponseRange)
+		}
+	}
+}
+
+func (p *kvProxy) Txn(ctx context.Context, r *pb.TxnRequest) (*pb.TxnResponse, error) {
+	op := TxnRequestToOp(r)
+	opResp, err := p.kv.Do(ctx, op)
+	if err != nil {
+		return nil, err
+	}
+	resp := opResp.Txn()
+
+	// txn may claim an outdated key is updated; be safe and invalidate
+	for _, cmp := range r.Compare {
+		p.cache.Invalidate(cmp.Key, cmp.RangeEnd)
+	}
+	// update any fetched keys
+	if resp.Succeeded {
+		p.txnToCache(r.Success, resp.Responses)
+	} else {
+		p.txnToCache(r.Failure, resp.Responses)
+	}
+
+	cacheKeys.Set(float64(p.cache.Size()))
+
+	return (*pb.TxnResponse)(resp), nil
+}
+
+func (p *kvProxy) Compact(ctx context.Context, r *pb.CompactionRequest) (*pb.CompactionResponse, error) {
+	var opts []clientv3.CompactOption
+	if r.Physical {
+		opts = append(opts, clientv3.WithCompactPhysical())
+	}
+
+	resp, err := p.kv.Compact(ctx, r.Revision, opts...)
+	if err == nil {
+		p.cache.Compact(r.Revision)
+	}
+
+	cacheKeys.Set(float64(p.cache.Size()))
+
+	return (*pb.CompactionResponse)(resp), err
+}
+
+func requestOpToOp(union *pb.RequestOp) clientv3.Op {
+	switch tv := union.Request.(type) {
+	case *pb.RequestOp_RequestRange:
+		if tv.RequestRange != nil {
+			return RangeRequestToOp(tv.RequestRange)
+		}
+	case *pb.RequestOp_RequestPut:
+		if tv.RequestPut != nil {
+			return PutRequestToOp(tv.RequestPut)
+		}
+	case *pb.RequestOp_RequestDeleteRange:
+		if tv.RequestDeleteRange != nil {
+			return DelRequestToOp(tv.RequestDeleteRange)
+		}
+	case *pb.RequestOp_RequestTxn:
+		if tv.RequestTxn != nil {
+			return TxnRequestToOp(tv.RequestTxn)
+		}
+	}
+	panic("unknown request")
+}
+
+func RangeRequestToOp(r *pb.RangeRequest) clientv3.Op {
+	opts := []clientv3.OpOption{}
+	if len(r.RangeEnd) != 0 {
+		opts = append(opts, clientv3.WithRange(string(r.RangeEnd)))
+	}
+	opts = append(opts, clientv3.WithRev(r.Revision))
+	opts = append(opts, clientv3.WithLimit(r.Limit))
+	opts = append(opts, clientv3.WithSort(
+		clientv3.SortTarget(r.SortTarget),
+		clientv3.SortOrder(r.SortOrder)),
+	)
+	opts = append(opts, clientv3.WithMaxCreateRev(r.MaxCreateRevision))
+	opts = append(opts, clientv3.WithMinCreateRev(r.MinCreateRevision))
+	opts = append(opts, clientv3.WithMaxModRev(r.MaxModRevision))
+	opts = append(opts, clientv3.WithMinModRev(r.MinModRevision))
+	if r.CountOnly {
+		opts = append(opts, clientv3.WithCountOnly())
+	}
+	if r.KeysOnly {
+		opts = append(opts, clientv3.WithKeysOnly())
+	}
+	if r.Serializable {
+		opts = append(opts, clientv3.WithSerializable())
+	}
+
+	return clientv3.OpGet(string(r.Key), opts...)
+}
+
+func PutRequestToOp(r *pb.PutRequest) clientv3.Op {
+	opts := []clientv3.OpOption{}
+	opts = append(opts, clientv3.WithLease(clientv3.LeaseID(r.Lease)))
+	if r.IgnoreValue {
+		opts = append(opts, clientv3.WithIgnoreValue())
+	}
+	if r.IgnoreLease {
+		opts = append(opts, clientv3.WithIgnoreLease())
+	}
+	if r.PrevKv {
+		opts = append(opts, clientv3.WithPrevKV())
+	}
+	return clientv3.OpPut(string(r.Key), string(r.Value), opts...)
+}
+
+func DelRequestToOp(r *pb.DeleteRangeRequest) clientv3.Op {
+	opts := []clientv3.OpOption{}
+	if len(r.RangeEnd) != 0 {
+		opts = append(opts, clientv3.WithRange(string(r.RangeEnd)))
+	}
+	if r.PrevKv {
+		opts = append(opts, clientv3.WithPrevKV())
+	}
+	return clientv3.OpDelete(string(r.Key), opts...)
+}
+
+func TxnRequestToOp(r *pb.TxnRequest) clientv3.Op {
+	cmps := make([]clientv3.Cmp, len(r.Compare))
+	thenops := make([]clientv3.Op, len(r.Success))
+	elseops := make([]clientv3.Op, len(r.Failure))
+	for i := range r.Compare {
+		cmps[i] = (clientv3.Cmp)(*r.Compare[i])
+	}
+	for i := range r.Success {
+		thenops[i] = requestOpToOp(r.Success[i])
+	}
+	for i := range r.Failure {
+		elseops[i] = requestOpToOp(r.Failure[i])
+	}
+	return clientv3.OpTxn(cmps, thenops, elseops)
+}