diff --git a/api/grpc/types/api.pb.go b/api/grpc/types/api.pb.go
index 3ce61dbba..d0851d431 100644
--- a/api/grpc/types/api.pb.go
+++ b/api/grpc/types/api.pb.go
@@ -849,6 +849,10 @@ func init() {
 var _ context.Context
 var _ grpc.ClientConn
 
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+const _ = grpc.SupportPackageIsVersion2
+
 // Client API for API service
 
 type APIClient interface {
@@ -1026,124 +1030,184 @@ func RegisterAPIServer(s *grpc.Server, srv APIServer) {
 	s.RegisterService(&_API_serviceDesc, srv)
 }
 
-func _API_GetServerVersion_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error) (interface{}, error) {
+func _API_GetServerVersion_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(GetServerVersionRequest)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
-	out, err := srv.(APIServer).GetServerVersion(ctx, in)
-	if err != nil {
-		return nil, err
+	if interceptor == nil {
+		return srv.(APIServer).GetServerVersion(ctx, in)
 	}
-	return out, nil
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/types.API/GetServerVersion",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(APIServer).GetServerVersion(ctx, req.(*GetServerVersionRequest))
+	}
+	return interceptor(ctx, in, info, handler)
 }
 
-func _API_CreateContainer_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error) (interface{}, error) {
+func _API_CreateContainer_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(CreateContainerRequest)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
-	out, err := srv.(APIServer).CreateContainer(ctx, in)
-	if err != nil {
-		return nil, err
+	if interceptor == nil {
+		return srv.(APIServer).CreateContainer(ctx, in)
 	}
-	return out, nil
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/types.API/CreateContainer",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(APIServer).CreateContainer(ctx, req.(*CreateContainerRequest))
+	}
+	return interceptor(ctx, in, info, handler)
 }
 
-func _API_UpdateContainer_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error) (interface{}, error) {
+func _API_UpdateContainer_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(UpdateContainerRequest)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
-	out, err := srv.(APIServer).UpdateContainer(ctx, in)
-	if err != nil {
-		return nil, err
+	if interceptor == nil {
+		return srv.(APIServer).UpdateContainer(ctx, in)
 	}
-	return out, nil
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/types.API/UpdateContainer",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(APIServer).UpdateContainer(ctx, req.(*UpdateContainerRequest))
+	}
+	return interceptor(ctx, in, info, handler)
 }
 
-func _API_Signal_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error) (interface{}, error) {
+func _API_Signal_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(SignalRequest)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
-	out, err := srv.(APIServer).Signal(ctx, in)
-	if err != nil {
-		return nil, err
+	if interceptor == nil {
+		return srv.(APIServer).Signal(ctx, in)
 	}
-	return out, nil
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/types.API/Signal",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(APIServer).Signal(ctx, req.(*SignalRequest))
+	}
+	return interceptor(ctx, in, info, handler)
 }
 
-func _API_UpdateProcess_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error) (interface{}, error) {
+func _API_UpdateProcess_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(UpdateProcessRequest)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
-	out, err := srv.(APIServer).UpdateProcess(ctx, in)
-	if err != nil {
-		return nil, err
+	if interceptor == nil {
+		return srv.(APIServer).UpdateProcess(ctx, in)
 	}
-	return out, nil
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/types.API/UpdateProcess",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(APIServer).UpdateProcess(ctx, req.(*UpdateProcessRequest))
+	}
+	return interceptor(ctx, in, info, handler)
 }
 
-func _API_AddProcess_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error) (interface{}, error) {
+func _API_AddProcess_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(AddProcessRequest)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
-	out, err := srv.(APIServer).AddProcess(ctx, in)
-	if err != nil {
-		return nil, err
+	if interceptor == nil {
+		return srv.(APIServer).AddProcess(ctx, in)
 	}
-	return out, nil
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/types.API/AddProcess",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(APIServer).AddProcess(ctx, req.(*AddProcessRequest))
+	}
+	return interceptor(ctx, in, info, handler)
 }
 
-func _API_CreateCheckpoint_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error) (interface{}, error) {
+func _API_CreateCheckpoint_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(CreateCheckpointRequest)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
-	out, err := srv.(APIServer).CreateCheckpoint(ctx, in)
-	if err != nil {
-		return nil, err
+	if interceptor == nil {
+		return srv.(APIServer).CreateCheckpoint(ctx, in)
 	}
-	return out, nil
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/types.API/CreateCheckpoint",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(APIServer).CreateCheckpoint(ctx, req.(*CreateCheckpointRequest))
+	}
+	return interceptor(ctx, in, info, handler)
 }
 
-func _API_DeleteCheckpoint_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error) (interface{}, error) {
+func _API_DeleteCheckpoint_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(DeleteCheckpointRequest)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
-	out, err := srv.(APIServer).DeleteCheckpoint(ctx, in)
-	if err != nil {
-		return nil, err
+	if interceptor == nil {
+		return srv.(APIServer).DeleteCheckpoint(ctx, in)
 	}
-	return out, nil
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/types.API/DeleteCheckpoint",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(APIServer).DeleteCheckpoint(ctx, req.(*DeleteCheckpointRequest))
+	}
+	return interceptor(ctx, in, info, handler)
 }
 
-func _API_ListCheckpoint_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error) (interface{}, error) {
+func _API_ListCheckpoint_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(ListCheckpointRequest)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
-	out, err := srv.(APIServer).ListCheckpoint(ctx, in)
-	if err != nil {
-		return nil, err
+	if interceptor == nil {
+		return srv.(APIServer).ListCheckpoint(ctx, in)
 	}
-	return out, nil
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/types.API/ListCheckpoint",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(APIServer).ListCheckpoint(ctx, req.(*ListCheckpointRequest))
+	}
+	return interceptor(ctx, in, info, handler)
 }
 
-func _API_State_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error) (interface{}, error) {
+func _API_State_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(StateRequest)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
-	out, err := srv.(APIServer).State(ctx, in)
-	if err != nil {
-		return nil, err
+	if interceptor == nil {
+		return srv.(APIServer).State(ctx, in)
 	}
-	return out, nil
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/types.API/State",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(APIServer).State(ctx, req.(*StateRequest))
+	}
+	return interceptor(ctx, in, info, handler)
 }
 
 func _API_Events_Handler(srv interface{}, stream grpc.ServerStream) error {
@@ -1167,16 +1231,22 @@ func (x *aPIEventsServer) Send(m *Event) error {
 	return x.ServerStream.SendMsg(m)
 }
 
-func _API_Stats_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error) (interface{}, error) {
+func _API_Stats_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(StatsRequest)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
-	out, err := srv.(APIServer).Stats(ctx, in)
-	if err != nil {
-		return nil, err
+	if interceptor == nil {
+		return srv.(APIServer).Stats(ctx, in)
 	}
-	return out, nil
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/types.API/Stats",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(APIServer).Stats(ctx, req.(*StatsRequest))
+	}
+	return interceptor(ctx, in, info, handler)
 }
 
 var _API_serviceDesc = grpc.ServiceDesc{
@@ -1238,148 +1308,123 @@ var _API_serviceDesc = grpc.ServiceDesc{
 }
 
 var fileDescriptor0 = []byte{
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+	0x51, 0x50, 0x4f, 0x5e, 0xdd, 0x7a, 0x89, 0x4a, 0xe6, 0x3e, 0x56, 0xcc, 0xa1, 0x9e, 0x43, 0x7b,
+	0xf1, 0x62, 0xe3, 0xc9, 0x76, 0xaa, 0xf2, 0x5a, 0x2d, 0xdd, 0x10, 0x16, 0x91, 0xf0, 0x55, 0x0e,
+	0x09, 0xd4, 0xa1, 0x88, 0x97, 0xa4, 0x0d, 0x4e, 0x4d, 0xb7, 0x72, 0xa1, 0xff, 0xc5, 0x8a, 0x60,
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+	0x28, 0xfb, 0xa1, 0x5a, 0x52, 0xfe, 0xb8, 0x6f, 0x60, 0xf0, 0x66, 0x81, 0xf7, 0x5d, 0x81, 0x1d,
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+	0x13, 0x9a, 0x78, 0x57, 0xe5, 0x71, 0xce, 0x85, 0xee, 0xf8, 0xc0, 0x56, 0xad, 0x75, 0xf4, 0x0c,
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+	0xa9, 0x23, 0xfb, 0x81, 0xd5, 0xbc, 0x36, 0xf0, 0x2c, 0xef, 0xbf, 0xe6, 0x11, 0x2f, 0x2c, 0xf2,
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+	0x14, 0xa0, 0x9b, 0x2f, 0xc0, 0xee, 0xf8, 0x89, 0x81, 0xc8, 0xef, 0x52, 0x55, 0x79, 0xa7, 0x6f,
+	0x4c, 0xd9, 0x23, 0xc7, 0xf9, 0x1e, 0xf4, 0x23, 0x7d, 0x06, 0x66, 0xbc, 0xd5, 0x72, 0x00, 0x85,
+	0xf3, 0x11, 0xb9, 0xf3, 0x95, 0x37, 0x5b, 0xb9, 0xcb, 0x47, 0xa2, 0x70, 0xda, 0xea, 0xce, 0x6b,
+	0x2e, 0xf4, 0xdb, 0x1e, 0xbf, 0xe3, 0x7f, 0x35, 0xa1, 0xf6, 0xd9, 0xe4, 0x57, 0xce, 0x35, 0x3c,
+	0x2e, 0x7f, 0x2d, 0x71, 0x9e, 0x19, 0xf8, 0x1d, 0x5f, 0x58, 0x46, 0xef, 0xed, 0x5c, 0x37, 0xb7,
+	0x8b, 0x47, 0xce, 0x25, 0x1c, 0x94, 0xbe, 0x04, 0x38, 0xb6, 0xd5, 0x6d, 0xff, 0x86, 0x31, 0x7a,
+	0xb6, 0x6b, 0x39, 0x8f, 0x59, 0xba, 0xce, 0x64, 0x98, 0xdb, 0xaf, 0x8e, 0x19, 0xe6, 0xae, 0x5b,
+	0xd0, 0x23, 0xe7, 0x27, 0xd0, 0xd4, 0xdf, 0x0d, 0x9c, 0x23, 0x23, 0x5b, 0xf8, 0x00, 0x31, 0x3a,
+	0x2e, 0xcd, 0x66, 0x1b, 0x2f, 0xa0, 0x5f, 0xf8, 0x4c, 0xe3, 0xbc, 0x53, 0xd0, 0x55, 0xfc, 0xec,
+	0x30, 0xfa, 0xd6, 0xf6, 0xc5, 0x0c, 0xed, 0x1c, 0x60, 0xfd, 0x1a, 0x76, 0x86, 0x46, 0x7a, 0xe3,
+	0xf3, 0xc5, 0xe8, 0xe9, 0x96, 0x95, 0x0c, 0x04, 0x43, 0x59, 0x7e, 0xee, 0x3a, 0x25, 0x56, 0xcb,
+	0x8f, 0xd3, 0x2c, 0x94, 0x3b, 0xdf, 0xc9, 0x0a, 0xb6, 0xfc, 0xe8, 0xcd, 0x60, 0x77, 0x3c, 0xa1,
+	0x33, 0xd8, 0x9d, 0xaf, 0xe5, 0x47, 0xce, 0x6f, 0x60, 0x50, 0x7c, 0xaf, 0x3a, 0x96, 0xa4, 0xad,
+	0xcf, 0xe8, 0xd1, 0xbb, 0x3b, 0x56, 0x33, 0xc0, 0x1f, 0x42, 0x43, 0xbf, 0x4c, 0x6d, 0x21, 0xe5,
+	0x1f, 0xb3, 0xa3, 0xa3, 0xe2, 0x64, 0xb6, 0xeb, 0x63, 0x68, 0xea, 0x8b, 0x70, 0x96, 0x00, 0x85,
+	0x7b, 0xf1, 0xa8, 0x97, 0x9f, 0x75, 0x1f, 0x7d, 0x5c, 0xb1, 0x7a, 0x78, 0x41, 0x0f, 0xdf, 0xa6,
+	0x27, 0x17, 0x9c, 0x59, 0x53, 0x7d, 0xbe, 0x7c, 0xf9, 0xef, 0x00, 0x00, 0x00, 0xff, 0xff, 0x65,
+	0x85, 0xda, 0xbd, 0xcb, 0x14, 0x00, 0x00,
 }
diff --git a/hack/vendor.sh b/hack/vendor.sh
index 4df20353d..86a99b27d 100755
--- a/hack/vendor.sh
+++ b/hack/vendor.sh
@@ -13,7 +13,7 @@ clone git github.com/docker/docker 2f6e3b0ba027b558adabd41344fee59db4441011
 clone git github.com/docker/go-units 5d2041e26a699eaca682e2ea41c8f891e1060444
 clone git github.com/godbus/dbus e2cf28118e66a6a63db46cf6088a35d2054d3bb0
 clone git github.com/golang/glog 23def4e6c14b4da8ac2ed8007337bc5eb5007998
-clone git github.com/golang/protobuf 8d92cf5fc15a4382f8964b08e1f42a75c0591aa3
+clone git github.com/golang/protobuf 3c84672111d91bb5ac31719e112f9f7126a0e26e
 clone git github.com/opencontainers/runc d49ece5a83da3dcb820121d6850e2b61bd0a5fbe
 clone git github.com/opencontainers/runtime-spec f955d90e70a98ddfb886bd930ffd076da9b67998
 clone git github.com/rcrowley/go-metrics eeba7bd0dd01ace6e690fa833b3f22aaec29af43
@@ -22,7 +22,7 @@ clone git github.com/syndtr/gocapability 2c00daeb6c3b45114c80ac44119e7b8801fdd85
 clone git github.com/vishvananda/netlink adb0f53af689dd38f1443eba79489feaacf0b22e
 clone git github.com/Azure/go-ansiterm 70b2c90b260171e829f1ebd7c17f600c11858dbe
 clone git golang.org/x/net 991d3e32f76f19ee6d9caadb3a22eae8d23315f7 https://github.com/golang/net.git
-clone git google.golang.org/grpc a22b6611561e9f0a3e0919690dd2caf48f14c517 https://github.com/grpc/grpc-go.git
+clone git google.golang.org/grpc ab0be5212fb225475f2087566eded7da5d727960 https://github.com/grpc/grpc-go.git
 clone git github.com/seccomp/libseccomp-golang 1b506fc7c24eec5a3693cdcbed40d9c226cfc6a1
 
 clone git github.com/vdemeester/shakers 24d7f1d6a71aa5d9cbe7390e4afb66b7eef9e1b3
diff --git a/integration-test/start_test.go b/integration-test/start_test.go
index 899083009..1f1addc9e 100644
--- a/integration-test/start_test.go
+++ b/integration-test/start_test.go
@@ -9,6 +9,7 @@ import (
 	"github.com/docker/containerd/api/grpc/types"
 	"github.com/docker/docker/pkg/integration/checker"
 	"github.com/go-check/check"
+	"google.golang.org/grpc"
 )
 
 func (cs *ContainerdSuite) TestStartBusyboxLsSlash(t *check.C) {
@@ -44,14 +45,14 @@ var
 }
 
 func (cs *ContainerdSuite) TestStartBusyboxNoSuchFile(t *check.C) {
-	expectedOutput := `oci runtime error: exec: \"NoSuchFile\": executable file not found in $PATH`
+	expectedOutput := `oci runtime error: exec: "NoSuchFile": executable file not found in $PATH`
 
 	if err := CreateBusyboxBundle("busybox-no-such-file", []string{"NoSuchFile"}); err != nil {
 		t.Fatal(err)
 	}
 
 	_, err := cs.RunContainer("NoSuchFile", "busybox-no-such-file")
-	t.Assert(err.Error(), checker.Contains, expectedOutput)
+	t.Assert(grpc.ErrorDesc(err), checker.Contains, expectedOutput)
 }
 
 func (cs *ContainerdSuite) TestStartBusyboxTop(t *check.C) {
diff --git a/vendor/src/github.com/golang/protobuf/proto/Makefile b/vendor/src/github.com/golang/protobuf/proto/Makefile
index e2e0651a9..f1f06564a 100644
--- a/vendor/src/github.com/golang/protobuf/proto/Makefile
+++ b/vendor/src/github.com/golang/protobuf/proto/Makefile
@@ -39,5 +39,5 @@ test: install generate-test-pbs
 generate-test-pbs:
 	make install
 	make -C testdata
-	protoc --go_out=Mtestdata/test.proto=github.com/golang/protobuf/proto/testdata,Mgoogle/protobuf/any.proto=github.com/golang/protobuf/ptypes/any:. proto3_proto/proto3.proto
+	protoc --go_out=Mtestdata/test.proto=github.com/golang/protobuf/proto/testdata:. proto3_proto/proto3.proto
 	make
diff --git a/vendor/src/github.com/golang/protobuf/proto/decode.go b/vendor/src/github.com/golang/protobuf/proto/decode.go
index f94b9f416..5810782fd 100644
--- a/vendor/src/github.com/golang/protobuf/proto/decode.go
+++ b/vendor/src/github.com/golang/protobuf/proto/decode.go
@@ -768,11 +768,10 @@ func (o *Buffer) dec_new_map(p *Properties, base structPointer) error {
 		}
 	}
 	keyelem, valelem := keyptr.Elem(), valptr.Elem()
-	if !keyelem.IsValid() {
-		keyelem = reflect.Zero(p.mtype.Key())
-	}
-	if !valelem.IsValid() {
-		valelem = reflect.Zero(p.mtype.Elem())
+	if !keyelem.IsValid() || !valelem.IsValid() {
+		// We did not decode the key or the value in the map entry.
+		// Either way, it's an invalid map entry.
+		return fmt.Errorf("proto: bad map data: missing key/val")
 	}
 
 	v.SetMapIndex(keyelem, valelem)
diff --git a/vendor/src/github.com/golang/protobuf/proto/encode.go b/vendor/src/github.com/golang/protobuf/proto/encode.go
index eb7e0474e..231b07401 100644
--- a/vendor/src/github.com/golang/protobuf/proto/encode.go
+++ b/vendor/src/github.com/golang/protobuf/proto/encode.go
@@ -64,10 +64,6 @@ var (
 	// a struct with a repeated field containing a nil element.
 	errRepeatedHasNil = errors.New("proto: repeated field has nil element")
 
-	// errOneofHasNil is the error returned if Marshal is called with
-	// a struct with a oneof field containing a nil element.
-	errOneofHasNil = errors.New("proto: oneof field has nil value")
-
 	// ErrNil is the error returned if Marshal is called with nil.
 	ErrNil = errors.New("proto: Marshal called with nil")
 )
@@ -1226,9 +1222,7 @@ func (o *Buffer) enc_struct(prop *StructProperties, base structPointer) error {
 	// Do oneof fields.
 	if prop.oneofMarshaler != nil {
 		m := structPointer_Interface(base, prop.stype).(Message)
-		if err := prop.oneofMarshaler(m, o); err == ErrNil {
-			return errOneofHasNil
-		} else if err != nil {
+		if err := prop.oneofMarshaler(m, o); err != nil {
 			return err
 		}
 	}
diff --git a/vendor/src/github.com/golang/protobuf/proto/text.go b/vendor/src/github.com/golang/protobuf/proto/text.go
index 37c953570..1cbaf86d3 100644
--- a/vendor/src/github.com/golang/protobuf/proto/text.go
+++ b/vendor/src/github.com/golang/protobuf/proto/text.go
@@ -175,93 +175,7 @@ type raw interface {
 	Bytes() []byte
 }
 
-func requiresQuotes(u string) bool {
-	// When type URL contains any characters except [0-9A-Za-z./\-]*, it must be quoted.
-	for _, ch := range u {
-		switch {
-		case ch == '.' || ch == '/' || ch == '_':
-			continue
-		case '0' <= ch && ch <= '9':
-			continue
-		case 'A' <= ch && ch <= 'Z':
-			continue
-		case 'a' <= ch && ch <= 'z':
-			continue
-		default:
-			return true
-		}
-	}
-	return false
-}
-
-// isAny reports whether sv is a google.protobuf.Any message
-func isAny(sv reflect.Value) bool {
-	type wkt interface {
-		XXX_WellKnownType() string
-	}
-	t, ok := sv.Addr().Interface().(wkt)
-	return ok && t.XXX_WellKnownType() == "Any"
-}
-
-// writeProto3Any writes an expanded google.protobuf.Any message.
-//
-// It returns (false, nil) if sv value can't be unmarshaled (e.g. because
-// required messages are not linked in).
-//
-// It returns (true, error) when sv was written in expanded format or an error
-// was encountered.
-func (tm *TextMarshaler) writeProto3Any(w *textWriter, sv reflect.Value) (bool, error) {
-	turl := sv.FieldByName("TypeUrl")
-	val := sv.FieldByName("Value")
-	if !turl.IsValid() || !val.IsValid() {
-		return true, errors.New("proto: invalid google.protobuf.Any message")
-	}
-
-	b, ok := val.Interface().([]byte)
-	if !ok {
-		return true, errors.New("proto: invalid google.protobuf.Any message")
-	}
-
-	parts := strings.Split(turl.String(), "/")
-	mt := MessageType(parts[len(parts)-1])
-	if mt == nil {
-		return false, nil
-	}
-	m := reflect.New(mt.Elem())
-	if err := Unmarshal(b, m.Interface().(Message)); err != nil {
-		return false, nil
-	}
-	w.Write([]byte("["))
-	u := turl.String()
-	if requiresQuotes(u) {
-		writeString(w, u)
-	} else {
-		w.Write([]byte(u))
-	}
-	if w.compact {
-		w.Write([]byte("]:<"))
-	} else {
-		w.Write([]byte("]: <\n"))
-		w.ind++
-	}
-	if err := tm.writeStruct(w, m.Elem()); err != nil {
-		return true, err
-	}
-	if w.compact {
-		w.Write([]byte("> "))
-	} else {
-		w.ind--
-		w.Write([]byte(">\n"))
-	}
-	return true, nil
-}
-
-func (tm *TextMarshaler) writeStruct(w *textWriter, sv reflect.Value) error {
-	if tm.ExpandAny && isAny(sv) {
-		if canExpand, err := tm.writeProto3Any(w, sv); canExpand {
-			return err
-		}
-	}
+func writeStruct(w *textWriter, sv reflect.Value) error {
 	st := sv.Type()
 	sprops := GetProperties(st)
 	for i := 0; i < sv.NumField(); i++ {
@@ -313,7 +227,7 @@ func (tm *TextMarshaler) writeStruct(w *textWriter, sv reflect.Value) error {
 					}
 					continue
 				}
-				if err := tm.writeAny(w, v, props); err != nil {
+				if err := writeAny(w, v, props); err != nil {
 					return err
 				}
 				if err := w.WriteByte('\n'); err != nil {
@@ -355,7 +269,7 @@ func (tm *TextMarshaler) writeStruct(w *textWriter, sv reflect.Value) error {
 						return err
 					}
 				}
-				if err := tm.writeAny(w, key, props.mkeyprop); err != nil {
+				if err := writeAny(w, key, props.mkeyprop); err != nil {
 					return err
 				}
 				if err := w.WriteByte('\n'); err != nil {
@@ -372,7 +286,7 @@ func (tm *TextMarshaler) writeStruct(w *textWriter, sv reflect.Value) error {
 							return err
 						}
 					}
-					if err := tm.writeAny(w, val, props.mvalprop); err != nil {
+					if err := writeAny(w, val, props.mvalprop); err != nil {
 						return err
 					}
 					if err := w.WriteByte('\n'); err != nil {
@@ -444,7 +358,7 @@ func (tm *TextMarshaler) writeStruct(w *textWriter, sv reflect.Value) error {
 		}
 
 		// Enums have a String method, so writeAny will work fine.
-		if err := tm.writeAny(w, fv, props); err != nil {
+		if err := writeAny(w, fv, props); err != nil {
 			return err
 		}
 
@@ -456,7 +370,7 @@ func (tm *TextMarshaler) writeStruct(w *textWriter, sv reflect.Value) error {
 	// Extensions (the XXX_extensions field).
 	pv := sv.Addr()
 	if pv.Type().Implements(extendableProtoType) {
-		if err := tm.writeExtensions(w, pv); err != nil {
+		if err := writeExtensions(w, pv); err != nil {
 			return err
 		}
 	}
@@ -486,7 +400,7 @@ func writeRaw(w *textWriter, b []byte) error {
 }
 
 // writeAny writes an arbitrary field.
-func (tm *TextMarshaler) writeAny(w *textWriter, v reflect.Value, props *Properties) error {
+func writeAny(w *textWriter, v reflect.Value, props *Properties) error {
 	v = reflect.Indirect(v)
 
 	// Floats have special cases.
@@ -535,15 +449,15 @@ func (tm *TextMarshaler) writeAny(w *textWriter, v reflect.Value, props *Propert
 			}
 		}
 		w.indent()
-		if etm, ok := v.Interface().(encoding.TextMarshaler); ok {
-			text, err := etm.MarshalText()
+		if tm, ok := v.Interface().(encoding.TextMarshaler); ok {
+			text, err := tm.MarshalText()
 			if err != nil {
 				return err
 			}
 			if _, err = w.Write(text); err != nil {
 				return err
 			}
-		} else if err := tm.writeStruct(w, v); err != nil {
+		} else if err := writeStruct(w, v); err != nil {
 			return err
 		}
 		w.unindent()
@@ -687,7 +601,7 @@ func (s int32Slice) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
 
 // writeExtensions writes all the extensions in pv.
 // pv is assumed to be a pointer to a protocol message struct that is extendable.
-func (tm *TextMarshaler) writeExtensions(w *textWriter, pv reflect.Value) error {
+func writeExtensions(w *textWriter, pv reflect.Value) error {
 	emap := extensionMaps[pv.Type().Elem()]
 	ep := pv.Interface().(extendableProto)
 
@@ -722,13 +636,13 @@ func (tm *TextMarshaler) writeExtensions(w *textWriter, pv reflect.Value) error
 
 		// Repeated extensions will appear as a slice.
 		if !desc.repeated() {
-			if err := tm.writeExtension(w, desc.Name, pb); err != nil {
+			if err := writeExtension(w, desc.Name, pb); err != nil {
 				return err
 			}
 		} else {
 			v := reflect.ValueOf(pb)
 			for i := 0; i < v.Len(); i++ {
-				if err := tm.writeExtension(w, desc.Name, v.Index(i).Interface()); err != nil {
+				if err := writeExtension(w, desc.Name, v.Index(i).Interface()); err != nil {
 					return err
 				}
 			}
@@ -737,7 +651,7 @@ func (tm *TextMarshaler) writeExtensions(w *textWriter, pv reflect.Value) error
 	return nil
 }
 
-func (tm *TextMarshaler) writeExtension(w *textWriter, name string, pb interface{}) error {
+func writeExtension(w *textWriter, name string, pb interface{}) error {
 	if _, err := fmt.Fprintf(w, "[%s]:", name); err != nil {
 		return err
 	}
@@ -746,7 +660,7 @@ func (tm *TextMarshaler) writeExtension(w *textWriter, name string, pb interface
 			return err
 		}
 	}
-	if err := tm.writeAny(w, reflect.ValueOf(pb), nil); err != nil {
+	if err := writeAny(w, reflect.ValueOf(pb), nil); err != nil {
 		return err
 	}
 	if err := w.WriteByte('\n'); err != nil {
@@ -773,13 +687,12 @@ func (w *textWriter) writeIndent() {
 
 // TextMarshaler is a configurable text format marshaler.
 type TextMarshaler struct {
-	Compact   bool // use compact text format (one line).
-	ExpandAny bool // expand google.protobuf.Any messages of known types
+	Compact bool // use compact text format (one line).
 }
 
 // Marshal writes a given protocol buffer in text format.
 // The only errors returned are from w.
-func (tm *TextMarshaler) Marshal(w io.Writer, pb Message) error {
+func (m *TextMarshaler) Marshal(w io.Writer, pb Message) error {
 	val := reflect.ValueOf(pb)
 	if pb == nil || val.IsNil() {
 		w.Write([]byte("<nil>"))
@@ -794,11 +707,11 @@ func (tm *TextMarshaler) Marshal(w io.Writer, pb Message) error {
 	aw := &textWriter{
 		w:        ww,
 		complete: true,
-		compact:  tm.Compact,
+		compact:  m.Compact,
 	}
 
-	if etm, ok := pb.(encoding.TextMarshaler); ok {
-		text, err := etm.MarshalText()
+	if tm, ok := pb.(encoding.TextMarshaler); ok {
+		text, err := tm.MarshalText()
 		if err != nil {
 			return err
 		}
@@ -812,7 +725,7 @@ func (tm *TextMarshaler) Marshal(w io.Writer, pb Message) error {
 	}
 	// Dereference the received pointer so we don't have outer < and >.
 	v := reflect.Indirect(val)
-	if err := tm.writeStruct(aw, v); err != nil {
+	if err := writeStruct(aw, v); err != nil {
 		return err
 	}
 	if bw != nil {
@@ -822,9 +735,9 @@ func (tm *TextMarshaler) Marshal(w io.Writer, pb Message) error {
 }
 
 // Text is the same as Marshal, but returns the string directly.
-func (tm *TextMarshaler) Text(pb Message) string {
+func (m *TextMarshaler) Text(pb Message) string {
 	var buf bytes.Buffer
-	tm.Marshal(&buf, pb)
+	m.Marshal(&buf, pb)
 	return buf.String()
 }
 
diff --git a/vendor/src/github.com/golang/protobuf/proto/text_parser.go b/vendor/src/github.com/golang/protobuf/proto/text_parser.go
index b5e1c8e1f..451323262 100644
--- a/vendor/src/github.com/golang/protobuf/proto/text_parser.go
+++ b/vendor/src/github.com/golang/protobuf/proto/text_parser.go
@@ -163,7 +163,7 @@ func (p *textParser) advance() {
 	p.cur.offset, p.cur.line = p.offset, p.line
 	p.cur.unquoted = ""
 	switch p.s[0] {
-	case '<', '>', '{', '}', ':', '[', ']', ';', ',', '/':
+	case '<', '>', '{', '}', ':', '[', ']', ';', ',':
 		// Single symbol
 		p.cur.value, p.s = p.s[0:1], p.s[1:len(p.s)]
 	case '"', '\'':
@@ -451,10 +451,7 @@ func (p *textParser) readStruct(sv reflect.Value, terminator string) error {
 	fieldSet := make(map[string]bool)
 	// A struct is a sequence of "name: value", terminated by one of
 	// '>' or '}', or the end of the input.  A name may also be
-	// "[extension]" or "[type/url]".
-	//
-	// The whole struct can also be an expanded Any message, like:
-	// [type/url] < ... struct contents ... >
+	// "[extension]".
 	for {
 		tok := p.next()
 		if tok.err != nil {
@@ -464,66 +461,33 @@ func (p *textParser) readStruct(sv reflect.Value, terminator string) error {
 			break
 		}
 		if tok.value == "[" {
-			// Looks like an extension or an Any.
+			// Looks like an extension.
 			//
 			// TODO: Check whether we need to handle
 			// namespace rooted names (e.g. ".something.Foo").
-			extName, err := p.consumeExtName()
-			if err != nil {
-				return err
+			tok = p.next()
+			if tok.err != nil {
+				return tok.err
 			}
-
-			if s := strings.LastIndex(extName, "/"); s >= 0 {
-				// If it contains a slash, it's an Any type URL.
-				messageName := extName[s+1:]
-				mt := MessageType(messageName)
-				if mt == nil {
-					return p.errorf("unrecognized message %q in google.protobuf.Any", messageName)
-				}
-				tok = p.next()
-				if tok.err != nil {
-					return tok.err
-				}
-				// consume an optional colon
-				if tok.value == ":" {
-					tok = p.next()
-					if tok.err != nil {
-						return tok.err
-					}
-				}
-				var terminator string
-				switch tok.value {
-				case "<":
-					terminator = ">"
-				case "{":
-					terminator = "}"
-				default:
-					return p.errorf("expected '{' or '<', found %q", tok.value)
-				}
-				v := reflect.New(mt.Elem())
-				if pe := p.readStruct(v.Elem(), terminator); pe != nil {
-					return pe
-				}
-				b, err := Marshal(v.Interface().(Message))
-				if err != nil {
-					return p.errorf("failed to marshal message of type %q: %v", messageName, err)
-				}
-				sv.FieldByName("TypeUrl").SetString(extName)
-				sv.FieldByName("Value").SetBytes(b)
-				continue
-			}
-
 			var desc *ExtensionDesc
 			// This could be faster, but it's functional.
 			// TODO: Do something smarter than a linear scan.
 			for _, d := range RegisteredExtensions(reflect.New(st).Interface().(Message)) {
-				if d.Name == extName {
+				if d.Name == tok.value {
 					desc = d
 					break
 				}
 			}
 			if desc == nil {
-				return p.errorf("unrecognized extension %q", extName)
+				return p.errorf("unrecognized extension %q", tok.value)
+			}
+			// Check the extension terminator.
+			tok = p.next()
+			if tok.err != nil {
+				return tok.err
+			}
+			if tok.value != "]" {
+				return p.errorf("unrecognized extension terminator %q", tok.value)
 			}
 
 			props := &Properties{}
@@ -679,35 +643,6 @@ func (p *textParser) readStruct(sv reflect.Value, terminator string) error {
 	return reqFieldErr
 }
 
-// consumeExtName consumes extension name or expanded Any type URL and the
-// following ']'. It returns the name or URL consumed.
-func (p *textParser) consumeExtName() (string, error) {
-	tok := p.next()
-	if tok.err != nil {
-		return "", tok.err
-	}
-
-	// If extension name or type url is quoted, it's a single token.
-	if len(tok.value) > 2 && isQuote(tok.value[0]) && tok.value[len(tok.value)-1] == tok.value[0] {
-		name, err := unquoteC(tok.value[1:len(tok.value)-1], rune(tok.value[0]))
-		if err != nil {
-			return "", err
-		}
-		return name, p.consumeToken("]")
-	}
-
-	// Consume everything up to "]"
-	var parts []string
-	for tok.value != "]" {
-		parts = append(parts, tok.value)
-		tok = p.next()
-		if tok.err != nil {
-			return "", p.errorf("unrecognized type_url or extension name: %s", tok.err)
-		}
-	}
-	return strings.Join(parts, ""), nil
-}
-
 // consumeOptionalSeparator consumes an optional semicolon or comma.
 // It is used in readStruct to provide backward compatibility.
 func (p *textParser) consumeOptionalSeparator() error {
diff --git a/vendor/src/google.golang.org/grpc/.travis.yml b/vendor/src/google.golang.org/grpc/.travis.yml
index 3f83776ec..9bc2c1279 100644
--- a/vendor/src/google.golang.org/grpc/.travis.yml
+++ b/vendor/src/google.golang.org/grpc/.travis.yml
@@ -1,5 +1,9 @@
 language: go
 
+go:
+  - 1.5.3
+  - 1.6
+
 before_install:
   - go get github.com/axw/gocov/gocov
   - go get github.com/mattn/goveralls
@@ -11,4 +15,3 @@ install:
 
 script:
   - make test testrace
-  - make coverage
diff --git a/vendor/src/google.golang.org/grpc/CONTRIBUTING.md b/vendor/src/google.golang.org/grpc/CONTRIBUTING.md
index 407d384a7..36cd6f758 100644
--- a/vendor/src/google.golang.org/grpc/CONTRIBUTING.md
+++ b/vendor/src/google.golang.org/grpc/CONTRIBUTING.md
@@ -1,16 +1,39 @@
 # How to contribute
 
-We definitely welcome patches and contribution to grpc! Here is some guideline
+We definitely welcome patches and contribution to grpc! Here are some guidelines
 and information about how to do so.
 
-## Getting started
+## Sending patches
 
-### Legal requirements
+### Getting started
+
+1. Check out the code:
+
+        $ go get google.golang.org/grpc
+        $ cd $GOPATH/src/google.golang.org/grpc
+
+1. Create a fork of the grpc-go repository.
+1. Add your fork as a remote:
+
+        $ git remote add fork git@github.com:$YOURGITHUBUSERNAME/grpc-go.git
+
+1. Make changes, commit them.
+1. Run the test suite:
+
+        $ make test
+
+1. Push your changes to your fork:
+
+        $ git push fork ...
+
+1. Open a pull request.
+
+## Legal requirements
 
 In order to protect both you and ourselves, you will need to sign the
 [Contributor License Agreement](https://cla.developers.google.com/clas).
 
-### Filing Issues
+## Filing Issues
 When filing an issue, make sure to answer these five questions:
 
 1. What version of Go are you using (`go version`)?
diff --git a/vendor/src/google.golang.org/grpc/Makefile b/vendor/src/google.golang.org/grpc/Makefile
index 12e84e4e5..d26eb9081 100644
--- a/vendor/src/google.golang.org/grpc/Makefile
+++ b/vendor/src/google.golang.org/grpc/Makefile
@@ -1,15 +1,3 @@
-.PHONY: \
-	all \
-	deps \
-	updatedeps \
-	testdeps \
-	updatetestdeps \
-	build \
-	proto \
-	test \
-	testrace \
-	clean \
-
 all: test testrace
 
 deps:
@@ -32,7 +20,7 @@ proto:
 		echo "error: protoc not installed" >&2; \
 		exit 1; \
 	fi
-	go get -v github.com/golang/protobuf/protoc-gen-go
+	go get -u -v github.com/golang/protobuf/protoc-gen-go
 	for file in $$(git ls-files '*.proto'); do \
 		protoc -I $$(dirname $$file) --go_out=plugins=grpc:$$(dirname $$file) $$file; \
 	done
@@ -44,7 +32,20 @@ testrace: testdeps
 	go test -v -race -cpu 1,4 google.golang.org/grpc/...
 
 clean:
-	go clean google.golang.org/grpc/...
+	go clean -i google.golang.org/grpc/...
 
 coverage: testdeps
 	./coverage.sh --coveralls
+
+.PHONY: \
+	all \
+	deps \
+	updatedeps \
+	testdeps \
+	updatetestdeps \
+	build \
+	proto \
+	test \
+	testrace \
+	clean \
+	coverage
diff --git a/vendor/src/google.golang.org/grpc/README.md b/vendor/src/google.golang.org/grpc/README.md
index 37b05f095..90e9453d5 100644
--- a/vendor/src/google.golang.org/grpc/README.md
+++ b/vendor/src/google.golang.org/grpc/README.md
@@ -7,7 +7,7 @@ The Go implementation of [gRPC](http://www.grpc.io/): A high performance, open s
 Installation
 ------------
 
-To install this package, you need to install Go 1.4 or above and setup your Go workspace on your computer. The simplest way to install the library is to run:
+To install this package, you need to install Go and setup your Go workspace on your computer. The simplest way to install the library is to run:
 
 ```
 $ go get google.golang.org/grpc
@@ -16,7 +16,7 @@ $ go get google.golang.org/grpc
 Prerequisites
 -------------
 
-This requires Go 1.4 or above.
+This requires Go 1.5 or later .
 
 Constraints
 -----------
diff --git a/vendor/src/google.golang.org/grpc/backoff.go b/vendor/src/google.golang.org/grpc/backoff.go
new file mode 100644
index 000000000..dc4858ebe
--- /dev/null
+++ b/vendor/src/google.golang.org/grpc/backoff.go
@@ -0,0 +1,80 @@
+package grpc
+
+import (
+	"math/rand"
+	"time"
+)
+
+// DefaultBackoffConfig uses values specified for backoff in
+// https://github.com/grpc/grpc/blob/master/doc/connection-backoff.md.
+var (
+	DefaultBackoffConfig = BackoffConfig{
+		MaxDelay:  120 * time.Second,
+		baseDelay: 1.0 * time.Second,
+		factor:    1.6,
+		jitter:    0.2,
+	}
+)
+
+// backoffStrategy defines the methodology for backing off after a grpc
+// connection failure.
+//
+// This is unexported until the GRPC project decides whether or not to allow
+// alternative backoff strategies. Once a decision is made, this type and its
+// method may be exported.
+type backoffStrategy interface {
+	// backoff returns the amount of time to wait before the next retry given
+	// the number of consecutive failures.
+	backoff(retries int) time.Duration
+}
+
+// BackoffConfig defines the parameters for the default GRPC backoff strategy.
+type BackoffConfig struct {
+	// MaxDelay is the upper bound of backoff delay.
+	MaxDelay time.Duration
+
+	// TODO(stevvooe): The following fields are not exported, as allowing
+	// changes would violate the current GRPC specification for backoff. If
+	// GRPC decides to allow more interesting backoff strategies, these fields
+	// may be opened up in the future.
+
+	// baseDelay is the amount of time to wait before retrying after the first
+	// failure.
+	baseDelay time.Duration
+
+	// factor is applied to the backoff after each retry.
+	factor float64
+
+	// jitter provides a range to randomize backoff delays.
+	jitter float64
+}
+
+func setDefaults(bc *BackoffConfig) {
+	md := bc.MaxDelay
+	*bc = DefaultBackoffConfig
+
+	if md > 0 {
+		bc.MaxDelay = md
+	}
+}
+
+func (bc BackoffConfig) backoff(retries int) (t time.Duration) {
+	if retries == 0 {
+		return bc.baseDelay
+	}
+	backoff, max := float64(bc.baseDelay), float64(bc.MaxDelay)
+	for backoff < max && retries > 0 {
+		backoff *= bc.factor
+		retries--
+	}
+	if backoff > max {
+		backoff = max
+	}
+	// Randomize backoff delays so that if a cluster of requests start at
+	// the same time, they won't operate in lockstep.
+	backoff *= 1 + bc.jitter*(rand.Float64()*2-1)
+	if backoff < 0 {
+		return 0
+	}
+	return time.Duration(backoff)
+}
diff --git a/vendor/src/google.golang.org/grpc/call.go b/vendor/src/google.golang.org/grpc/call.go
index 9d815af39..9d0fc8eee 100644
--- a/vendor/src/google.golang.org/grpc/call.go
+++ b/vendor/src/google.golang.org/grpc/call.go
@@ -34,13 +34,13 @@
 package grpc
 
 import (
+	"bytes"
 	"io"
 	"time"
 
 	"golang.org/x/net/context"
 	"golang.org/x/net/trace"
 	"google.golang.org/grpc/codes"
-	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/transport"
 )
 
@@ -48,16 +48,16 @@ import (
 // On error, it returns the error and indicates whether the call should be retried.
 //
 // TODO(zhaoq): Check whether the received message sequence is valid.
-func recvResponse(codec Codec, t transport.ClientTransport, c *callInfo, stream *transport.Stream, reply interface{}) error {
+func recvResponse(dopts dialOptions, t transport.ClientTransport, c *callInfo, stream *transport.Stream, reply interface{}) error {
 	// Try to acquire header metadata from the server if there is any.
 	var err error
 	c.headerMD, err = stream.Header()
 	if err != nil {
 		return err
 	}
-	p := &parser{s: stream}
+	p := &parser{r: stream}
 	for {
-		if err = recv(p, codec, reply); err != nil {
+		if err = recv(p, dopts.codec, stream, dopts.dc, reply); err != nil {
 			if err == io.EOF {
 				break
 			}
@@ -69,7 +69,7 @@ func recvResponse(codec Codec, t transport.ClientTransport, c *callInfo, stream
 }
 
 // sendRequest writes out various information of an RPC such as Context and Message.
-func sendRequest(ctx context.Context, codec Codec, callHdr *transport.CallHdr, t transport.ClientTransport, args interface{}, opts *transport.Options) (_ *transport.Stream, err error) {
+func sendRequest(ctx context.Context, codec Codec, compressor Compressor, callHdr *transport.CallHdr, t transport.ClientTransport, args interface{}, opts *transport.Options) (_ *transport.Stream, err error) {
 	stream, err := t.NewStream(ctx, callHdr)
 	if err != nil {
 		return nil, err
@@ -81,8 +81,11 @@ func sendRequest(ctx context.Context, codec Codec, callHdr *transport.CallHdr, t
 			}
 		}
 	}()
-	// TODO(zhaoq): Support compression.
-	outBuf, err := encode(codec, args, compressionNone)
+	var cbuf *bytes.Buffer
+	if compressor != nil {
+		cbuf = new(bytes.Buffer)
+	}
+	outBuf, err := encode(codec, args, compressor, cbuf)
 	if err != nil {
 		return nil, transport.StreamErrorf(codes.Internal, "grpc: %v", err)
 	}
@@ -94,16 +97,9 @@ func sendRequest(ctx context.Context, codec Codec, callHdr *transport.CallHdr, t
 	return stream, nil
 }
 
-// callInfo contains all related configuration and information about an RPC.
-type callInfo struct {
-	failFast  bool
-	headerMD  metadata.MD
-	trailerMD metadata.MD
-	traceInfo traceInfo // in trace.go
-}
-
-// Invoke is called by the generated code. It sends the RPC request on the
-// wire and returns after response is received.
+// Invoke sends the RPC request on the wire and returns after response is received.
+// Invoke is called by generated code. Also users can call Invoke directly when it
+// is really needed in their use cases.
 func Invoke(ctx context.Context, method string, args, reply interface{}, cc *ClientConn, opts ...CallOption) (err error) {
 	var c callInfo
 	for _, o := range opts {
@@ -153,6 +149,9 @@ func Invoke(ctx context.Context, method string, args, reply interface{}, cc *Cli
 			Host:   cc.authority,
 			Method: method,
 		}
+		if cc.dopts.cp != nil {
+			callHdr.SendCompress = cc.dopts.cp.Type()
+		}
 		t, err = cc.dopts.picker.Pick(ctx)
 		if err != nil {
 			if lastErr != nil {
@@ -164,7 +163,7 @@ func Invoke(ctx context.Context, method string, args, reply interface{}, cc *Cli
 		if c.traceInfo.tr != nil {
 			c.traceInfo.tr.LazyLog(&payload{sent: true, msg: args}, true)
 		}
-		stream, err = sendRequest(ctx, cc.dopts.codec, callHdr, t, args, topts)
+		stream, err = sendRequest(ctx, cc.dopts.codec, cc.dopts.cp, callHdr, t, args, topts)
 		if err != nil {
 			if _, ok := err.(transport.ConnectionError); ok {
 				lastErr = err
@@ -176,7 +175,7 @@ func Invoke(ctx context.Context, method string, args, reply interface{}, cc *Cli
 			return toRPCErr(err)
 		}
 		// Receive the response
-		lastErr = recvResponse(cc.dopts.codec, t, &c, stream, reply)
+		lastErr = recvResponse(cc.dopts, t, &c, stream, reply)
 		if _, ok := lastErr.(transport.ConnectionError); ok {
 			continue
 		}
@@ -187,6 +186,6 @@ func Invoke(ctx context.Context, method string, args, reply interface{}, cc *Cli
 		if lastErr != nil {
 			return toRPCErr(lastErr)
 		}
-		return Errorf(stream.StatusCode(), stream.StatusDesc())
+		return Errorf(stream.StatusCode(), "%s", stream.StatusDesc())
 	}
 }
diff --git a/vendor/src/google.golang.org/grpc/clientconn.go b/vendor/src/google.golang.org/grpc/clientconn.go
index bf66914c1..6de86e9e4 100644
--- a/vendor/src/google.golang.org/grpc/clientconn.go
+++ b/vendor/src/google.golang.org/grpc/clientconn.go
@@ -52,10 +52,10 @@ var (
 	// ErrUnspecTarget indicates that the target address is unspecified.
 	ErrUnspecTarget = errors.New("grpc: target is unspecified")
 	// ErrNoTransportSecurity indicates that there is no transport security
-	// being set for ClientConn. Users should either set one or explicityly
+	// being set for ClientConn. Users should either set one or explicitly
 	// call WithInsecure DialOption to disable security.
 	ErrNoTransportSecurity = errors.New("grpc: no transport security set (use grpc.WithInsecure() explicitly or set credentials)")
-	// ErrCredentialsMisuse indicates that users want to transmit security infomation
+	// ErrCredentialsMisuse indicates that users want to transmit security information
 	// (e.g., oauth2 token) which requires secure connection on an insecure
 	// connection.
 	ErrCredentialsMisuse = errors.New("grpc: the credentials require transport level security (use grpc.WithTransportAuthenticator() to set)")
@@ -73,6 +73,9 @@ var (
 // values passed to Dial.
 type dialOptions struct {
 	codec    Codec
+	cp       Compressor
+	dc       Decompressor
+	bs       backoffStrategy
 	picker   Picker
 	block    bool
 	insecure bool
@@ -89,12 +92,57 @@ func WithCodec(c Codec) DialOption {
 	}
 }
 
+// WithCompressor returns a DialOption which sets a CompressorGenerator for generating message
+// compressor.
+func WithCompressor(cp Compressor) DialOption {
+	return func(o *dialOptions) {
+		o.cp = cp
+	}
+}
+
+// WithDecompressor returns a DialOption which sets a DecompressorGenerator for generating
+// message decompressor.
+func WithDecompressor(dc Decompressor) DialOption {
+	return func(o *dialOptions) {
+		o.dc = dc
+	}
+}
+
+// WithPicker returns a DialOption which sets a picker for connection selection.
 func WithPicker(p Picker) DialOption {
 	return func(o *dialOptions) {
 		o.picker = p
 	}
 }
 
+// WithBackoffMaxDelay configures the dialer to use the provided maximum delay
+// when backing off after failed connection attempts.
+func WithBackoffMaxDelay(md time.Duration) DialOption {
+	return WithBackoffConfig(BackoffConfig{MaxDelay: md})
+}
+
+// WithBackoffConfig configures the dialer to use the provided backoff
+// parameters after connection failures.
+//
+// Use WithBackoffMaxDelay until more parameters on BackoffConfig are opened up
+// for use.
+func WithBackoffConfig(b BackoffConfig) DialOption {
+	// Set defaults to ensure that provided BackoffConfig is valid and
+	// unexported fields get default values.
+	setDefaults(&b)
+	return withBackoff(b)
+}
+
+// withBackoff sets the backoff strategy used for retries after a
+// failed connection attempt.
+//
+// This can be exported if arbitrary backoff strategies are allowed by GRPC.
+func withBackoff(bs backoffStrategy) DialOption {
+	return func(o *dialOptions) {
+		o.bs = bs
+	}
+}
+
 // WithBlock returns a DialOption which makes caller of Dial blocks until the underlying
 // connection is up. Without this, Dial returns immediately and connecting the server
 // happens in background.
@@ -104,6 +152,8 @@ func WithBlock() DialOption {
 	}
 }
 
+// WithInsecure returns a DialOption which disables transport security for this ClientConn.
+// Note that transport security is required unless WithInsecure is set.
 func WithInsecure() DialOption {
 	return func(o *dialOptions) {
 		o.insecure = true
@@ -159,6 +209,11 @@ func Dial(target string, opts ...DialOption) (*ClientConn, error) {
 		// Set the default codec.
 		cc.dopts.codec = protoCodec{}
 	}
+
+	if cc.dopts.bs == nil {
+		cc.dopts.bs = DefaultBackoffConfig
+	}
+
 	if cc.dopts.picker == nil {
 		cc.dopts.picker = &unicastPicker{
 			target: target,
@@ -267,10 +322,9 @@ func NewConn(cc *ClientConn) (*Conn, error) {
 	if !c.dopts.insecure {
 		var ok bool
 		for _, cd := range c.dopts.copts.AuthOptions {
-			if _, ok := cd.(credentials.TransportAuthenticator); !ok {
-				continue
+			if _, ok = cd.(credentials.TransportAuthenticator); ok {
+				break
 			}
-			ok = true
 		}
 		if !ok {
 			return nil, ErrNoTransportSecurity
@@ -395,7 +449,7 @@ func (cc *Conn) resetTransport(closeTransport bool) error {
 				return ErrClientConnTimeout
 			}
 		}
-		sleepTime := backoff(retries)
+		sleepTime := cc.dopts.bs.backoff(retries)
 		timeout := sleepTime
 		if timeout < minConnectTimeout {
 			timeout = minConnectTimeout
@@ -518,8 +572,9 @@ func (cc *Conn) Wait(ctx context.Context) (transport.ClientTransport, error) {
 			cc.mu.Unlock()
 			return nil, ErrClientConnClosing
 		case cc.state == Ready:
+			ct := cc.transport
 			cc.mu.Unlock()
-			return cc.transport, nil
+			return ct, nil
 		default:
 			ready := cc.ready
 			if ready == nil {
diff --git a/vendor/src/google.golang.org/grpc/coverage.sh b/vendor/src/google.golang.org/grpc/coverage.sh
index 9de8c918d..120235374 100755
--- a/vendor/src/google.golang.org/grpc/coverage.sh
+++ b/vendor/src/google.golang.org/grpc/coverage.sh
@@ -4,15 +4,20 @@ set -e
 
 workdir=.cover
 profile="$workdir/cover.out"
-mode=count
+mode=set
+end2endtest="google.golang.org/grpc/test"
 
 generate_cover_data() {
     rm -rf "$workdir"
     mkdir "$workdir"
 
     for pkg in "$@"; do
-        f="$workdir/$(echo $pkg | tr / -).cover"
-        go test -covermode="$mode" -coverprofile="$f" "$pkg"
+        if [ $pkg == "google.golang.org/grpc" -o $pkg == "google.golang.org/grpc/transport" -o $pkg == "google.golang.org/grpc/metadata" -o $pkg == "google.golang.org/grpc/credentials" ]
+            then
+                f="$workdir/$(echo $pkg | tr / -)"
+                go test -covermode="$mode" -coverprofile="$f.cover" "$pkg"
+                go test -covermode="$mode" -coverpkg "$pkg" -coverprofile="$f.e2e.cover" "$end2endtest"
+        fi
     done
 
     echo "mode: $mode" >"$profile"
@@ -32,6 +37,8 @@ show_cover_report func
 case "$1" in
 "")
     ;;
+--html)
+    show_cover_report html ;;
 --coveralls)
     push_to_coveralls ;;
 *)
diff --git a/vendor/src/google.golang.org/grpc/credentials/credentials.go b/vendor/src/google.golang.org/grpc/credentials/credentials.go
index cde38dc4e..681f64e44 100644
--- a/vendor/src/google.golang.org/grpc/credentials/credentials.go
+++ b/vendor/src/google.golang.org/grpc/credentials/credentials.go
@@ -87,19 +87,6 @@ type AuthInfo interface {
 	AuthType() string
 }
 
-type authInfoKey struct{}
-
-// NewContext creates a new context with authInfo attached.
-func NewContext(ctx context.Context, authInfo AuthInfo) context.Context {
-	return context.WithValue(ctx, authInfoKey{}, authInfo)
-}
-
-// FromContext returns the authInfo in ctx if it exists.
-func FromContext(ctx context.Context) (authInfo AuthInfo, ok bool) {
-	authInfo, ok = ctx.Value(authInfoKey{}).(AuthInfo)
-	return
-}
-
 // TransportAuthenticator defines the common interface for all the live gRPC wire
 // protocols and supported transport security protocols (e.g., TLS, SSL).
 type TransportAuthenticator interface {
diff --git a/vendor/src/google.golang.org/grpc/doc.go b/vendor/src/google.golang.org/grpc/doc.go
index c63847745..a35f21885 100644
--- a/vendor/src/google.golang.org/grpc/doc.go
+++ b/vendor/src/google.golang.org/grpc/doc.go
@@ -1,6 +1,6 @@
 /*
 Package grpc implements an RPC system called gRPC.
 
-See https://github.com/grpc/grpc for more information about gRPC.
+See www.grpc.io for more information about gRPC.
 */
 package grpc // import "google.golang.org/grpc"
diff --git a/vendor/src/google.golang.org/grpc/grpclog/logger.go b/vendor/src/google.golang.org/grpc/grpclog/logger.go
index ec089f70f..3b2933079 100644
--- a/vendor/src/google.golang.org/grpc/grpclog/logger.go
+++ b/vendor/src/google.golang.org/grpc/grpclog/logger.go
@@ -42,6 +42,8 @@ import (
 )
 
 // Use golang's standard logger by default.
+// Access is not mutex-protected: do not modify except in init()
+// functions.
 var logger Logger = log.New(os.Stderr, "", log.LstdFlags)
 
 // Logger mimics golang's standard Logger as an interface.
@@ -54,7 +56,8 @@ type Logger interface {
 	Println(args ...interface{})
 }
 
-// SetLogger sets the logger that is used in grpc.
+// SetLogger sets the logger that is used in grpc. Call only from
+// init() functions.
 func SetLogger(l Logger) {
 	logger = l
 }
diff --git a/vendor/src/google.golang.org/grpc/interceptor.go b/vendor/src/google.golang.org/grpc/interceptor.go
new file mode 100644
index 000000000..588f59e5a
--- /dev/null
+++ b/vendor/src/google.golang.org/grpc/interceptor.go
@@ -0,0 +1,74 @@
+/*
+ *
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+package grpc
+
+import (
+	"golang.org/x/net/context"
+)
+
+// UnaryServerInfo consists of various information about a unary RPC on
+// server side. All per-rpc information may be mutated by the interceptor.
+type UnaryServerInfo struct {
+	// Server is the service implementation the user provides. This is read-only.
+	Server interface{}
+	// FullMethod is the full RPC method string, i.e., /package.service/method.
+	FullMethod string
+}
+
+// UnaryHandler defines the handler invoked by UnaryServerInterceptor to complete the normal
+// execution of a unary RPC.
+type UnaryHandler func(ctx context.Context, req interface{}) (interface{}, error)
+
+// UnaryServerInterceptor provides a hook to intercept the execution of a unary RPC on the server. info
+// contains all the information of this RPC the interceptor can operate on. And handler is the wrapper
+// of the service method implementation. It is the responsibility of the interceptor to invoke handler
+// to complete the RPC.
+type UnaryServerInterceptor func(ctx context.Context, req interface{}, info *UnaryServerInfo, handler UnaryHandler) (resp interface{}, err error)
+
+// StreamServerInfo consists of various information about a streaming RPC on
+// server side. All per-rpc information may be mutated by the interceptor.
+type StreamServerInfo struct {
+	// FullMethod is the full RPC method string, i.e., /package.service/method.
+	FullMethod string
+	// IsClientStream indicates whether the RPC is a client streaming RPC.
+	IsClientStream bool
+	// IsServerStream indicates whether the RPC is a server streaming RPC.
+	IsServerStream bool
+}
+
+// StreamServerInterceptor provides a hook to intercept the execution of a streaming RPC on the server.
+// info contains all the information of this RPC the interceptor can operate on. And handler is the
+// service method implementation. It is the responsibility of the interceptor to invoke handler to
+// complete the RPC.
+type StreamServerInterceptor func(srv interface{}, ss ServerStream, info *StreamServerInfo, handler StreamHandler) error
diff --git a/vendor/src/google.golang.org/grpc/internal/internal.go b/vendor/src/google.golang.org/grpc/internal/internal.go
new file mode 100644
index 000000000..5489143a8
--- /dev/null
+++ b/vendor/src/google.golang.org/grpc/internal/internal.go
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+// Package internal contains gRPC-internal code for testing, to avoid polluting
+// the godoc of the top-level grpc package.
+package internal
+
+// TestingCloseConns closes all existing transports but keeps
+// grpcServer.lis accepting new connections.
+//
+// The provided grpcServer must be of type *grpc.Server. It is untyped
+// for circular dependency reasons.
+var TestingCloseConns func(grpcServer interface{})
+
+// TestingUseHandlerImpl enables the http.Handler-based server implementation.
+// It must be called before Serve and requires TLS credentials.
+//
+// The provided grpcServer must be of type *grpc.Server. It is untyped
+// for circular dependency reasons.
+var TestingUseHandlerImpl func(grpcServer interface{})
diff --git a/vendor/src/google.golang.org/grpc/peer/peer.go b/vendor/src/google.golang.org/grpc/peer/peer.go
new file mode 100644
index 000000000..bfa6205ba
--- /dev/null
+++ b/vendor/src/google.golang.org/grpc/peer/peer.go
@@ -0,0 +1,65 @@
+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+// Package peer defines various peer information associated with RPCs and
+// corresponding utils.
+package peer
+
+import (
+	"net"
+
+	"golang.org/x/net/context"
+	"google.golang.org/grpc/credentials"
+)
+
+// Peer contains the information of the peer for an RPC.
+type Peer struct {
+	// Addr is the peer address.
+	Addr net.Addr
+	// AuthInfo is the authentication information of the transport.
+	// It is nil if there is no transport security being used.
+	AuthInfo credentials.AuthInfo
+}
+
+type peerKey struct{}
+
+// NewContext creates a new context with peer information attached.
+func NewContext(ctx context.Context, p *Peer) context.Context {
+	return context.WithValue(ctx, peerKey{}, p)
+}
+
+// FromContext returns the peer information in ctx if it exists.
+func FromContext(ctx context.Context) (p *Peer, ok bool) {
+	p, ok = ctx.Value(peerKey{}).(*Peer)
+	return
+}
diff --git a/vendor/src/google.golang.org/grpc/picker.go b/vendor/src/google.golang.org/grpc/picker.go
index b83c859b4..50f315b44 100644
--- a/vendor/src/google.golang.org/grpc/picker.go
+++ b/vendor/src/google.golang.org/grpc/picker.go
@@ -172,7 +172,7 @@ func (p *unicastNamingPicker) processUpdates() error {
 			}
 			p.mu.Unlock()
 		default:
-			grpclog.Println("Unknown update.Op %d", update.Op)
+			grpclog.Println("Unknown update.Op ", update.Op)
 		}
 	}
 	return nil
diff --git a/vendor/src/google.golang.org/grpc/rpc_util.go b/vendor/src/google.golang.org/grpc/rpc_util.go
index 46a6801b0..3192f0118 100644
--- a/vendor/src/google.golang.org/grpc/rpc_util.go
+++ b/vendor/src/google.golang.org/grpc/rpc_util.go
@@ -34,13 +34,14 @@
 package grpc
 
 import (
+	"bytes"
+	"compress/gzip"
 	"encoding/binary"
 	"fmt"
 	"io"
+	"io/ioutil"
 	"math"
-	"math/rand"
 	"os"
-	"time"
 
 	"github.com/golang/protobuf/proto"
 	"golang.org/x/net/context"
@@ -75,6 +76,71 @@ func (protoCodec) String() string {
 	return "proto"
 }
 
+// Compressor defines the interface gRPC uses to compress a message.
+type Compressor interface {
+	// Do compresses p into w.
+	Do(w io.Writer, p []byte) error
+	// Type returns the compression algorithm the Compressor uses.
+	Type() string
+}
+
+// NewGZIPCompressor creates a Compressor based on GZIP.
+func NewGZIPCompressor() Compressor {
+	return &gzipCompressor{}
+}
+
+type gzipCompressor struct {
+}
+
+func (c *gzipCompressor) Do(w io.Writer, p []byte) error {
+	z := gzip.NewWriter(w)
+	if _, err := z.Write(p); err != nil {
+		return err
+	}
+	return z.Close()
+}
+
+func (c *gzipCompressor) Type() string {
+	return "gzip"
+}
+
+// Decompressor defines the interface gRPC uses to decompress a message.
+type Decompressor interface {
+	// Do reads the data from r and uncompress them.
+	Do(r io.Reader) ([]byte, error)
+	// Type returns the compression algorithm the Decompressor uses.
+	Type() string
+}
+
+type gzipDecompressor struct {
+}
+
+// NewGZIPDecompressor creates a Decompressor based on GZIP.
+func NewGZIPDecompressor() Decompressor {
+	return &gzipDecompressor{}
+}
+
+func (d *gzipDecompressor) Do(r io.Reader) ([]byte, error) {
+	z, err := gzip.NewReader(r)
+	if err != nil {
+		return nil, err
+	}
+	defer z.Close()
+	return ioutil.ReadAll(z)
+}
+
+func (d *gzipDecompressor) Type() string {
+	return "gzip"
+}
+
+// callInfo contains all related configuration and information about an RPC.
+type callInfo struct {
+	failFast  bool
+	headerMD  metadata.MD
+	trailerMD metadata.MD
+	traceInfo traceInfo // in trace.go
+}
+
 // CallOption configures a Call before it starts or extracts information from
 // a Call after it completes.
 type CallOption interface {
@@ -118,36 +184,49 @@ type payloadFormat uint8
 
 const (
 	compressionNone payloadFormat = iota // no compression
-	compressionFlate
-	// More formats
+	compressionMade
 )
 
 // parser reads complelete gRPC messages from the underlying reader.
 type parser struct {
-	s io.Reader
-}
+	// r is the underlying reader.
+	// See the comment on recvMsg for the permissible
+	// error types.
+	r io.Reader
 
-// recvMsg is to read a complete gRPC message from the stream. It is blocking if
-// the message has not been complete yet. It returns the message and its type,
-// EOF is returned with nil msg and 0 pf if the entire stream is done. Other
-// non-nil error is returned if something is wrong on reading.
-func (p *parser) recvMsg() (pf payloadFormat, msg []byte, err error) {
 	// The header of a gRPC message. Find more detail
 	// at http://www.grpc.io/docs/guides/wire.html.
-	var buf [5]byte
+	header [5]byte
+}
 
-	if _, err := io.ReadFull(p.s, buf[:]); err != nil {
+// recvMsg reads a complete gRPC message from the stream.
+//
+// It returns the message and its payload (compression/encoding)
+// format. The caller owns the returned msg memory.
+//
+// If there is an error, possible values are:
+//   * io.EOF, when no messages remain
+//   * io.ErrUnexpectedEOF
+//   * of type transport.ConnectionError
+//   * of type transport.StreamError
+// No other error values or types must be returned, which also means
+// that the underlying io.Reader must not return an incompatible
+// error.
+func (p *parser) recvMsg() (pf payloadFormat, msg []byte, err error) {
+	if _, err := io.ReadFull(p.r, p.header[:]); err != nil {
 		return 0, nil, err
 	}
 
-	pf = payloadFormat(buf[0])
-	length := binary.BigEndian.Uint32(buf[1:])
+	pf = payloadFormat(p.header[0])
+	length := binary.BigEndian.Uint32(p.header[1:])
 
 	if length == 0 {
 		return pf, nil, nil
 	}
+	// TODO(bradfitz,zhaoq): garbage. reuse buffer after proto decoding instead
+	// of making it for each message:
 	msg = make([]byte, int(length))
-	if _, err := io.ReadFull(p.s, msg); err != nil {
+	if _, err := io.ReadFull(p.r, msg); err != nil {
 		if err == io.EOF {
 			err = io.ErrUnexpectedEOF
 		}
@@ -158,7 +237,7 @@ func (p *parser) recvMsg() (pf payloadFormat, msg []byte, err error) {
 
 // encode serializes msg and prepends the message header. If msg is nil, it
 // generates the message header of 0 message length.
-func encode(c Codec, msg interface{}, pf payloadFormat) ([]byte, error) {
+func encode(c Codec, msg interface{}, cp Compressor, cbuf *bytes.Buffer) ([]byte, error) {
 	var b []byte
 	var length uint
 	if msg != nil {
@@ -168,6 +247,12 @@ func encode(c Codec, msg interface{}, pf payloadFormat) ([]byte, error) {
 		if err != nil {
 			return nil, err
 		}
+		if cp != nil {
+			if err := cp.Do(cbuf, b); err != nil {
+				return nil, err
+			}
+			b = cbuf.Bytes()
+		}
 		length = uint(len(b))
 	}
 	if length > math.MaxUint32 {
@@ -182,7 +267,11 @@ func encode(c Codec, msg interface{}, pf payloadFormat) ([]byte, error) {
 	var buf = make([]byte, payloadLen+sizeLen+len(b))
 
 	// Write payload format
-	buf[0] = byte(pf)
+	if cp == nil {
+		buf[0] = byte(compressionNone)
+	} else {
+		buf[0] = byte(compressionMade)
+	}
 	// Write length of b into buf
 	binary.BigEndian.PutUint32(buf[1:], uint32(length))
 	// Copy encoded msg to buf
@@ -191,22 +280,38 @@ func encode(c Codec, msg interface{}, pf payloadFormat) ([]byte, error) {
 	return buf, nil
 }
 
-func recv(p *parser, c Codec, m interface{}) error {
+func checkRecvPayload(pf payloadFormat, recvCompress string, dc Decompressor) error {
+	switch pf {
+	case compressionNone:
+	case compressionMade:
+		if recvCompress == "" {
+			return transport.StreamErrorf(codes.InvalidArgument, "grpc: invalid grpc-encoding %q with compression enabled", recvCompress)
+		}
+		if dc == nil || recvCompress != dc.Type() {
+			return transport.StreamErrorf(codes.InvalidArgument, "grpc: Decompressor is not installed for grpc-encoding %q", recvCompress)
+		}
+	default:
+		return transport.StreamErrorf(codes.InvalidArgument, "grpc: received unexpected payload format %d", pf)
+	}
+	return nil
+}
+
+func recv(p *parser, c Codec, s *transport.Stream, dc Decompressor, m interface{}) error {
 	pf, d, err := p.recvMsg()
 	if err != nil {
 		return err
 	}
-	switch pf {
-	case compressionNone:
-		if err := c.Unmarshal(d, m); err != nil {
-			if rErr, ok := err.(rpcError); ok {
-				return rErr
-			} else {
-				return Errorf(codes.Internal, "grpc: %v", err)
-			}
+	if err := checkRecvPayload(pf, s.RecvCompress(), dc); err != nil {
+		return err
+	}
+	if pf == compressionMade {
+		d, err = dc.Do(bytes.NewReader(d))
+		if err != nil {
+			return transport.StreamErrorf(codes.Internal, "grpc: failed to decompress the received message %v", err)
 		}
-	default:
-		return Errorf(codes.Internal, "gprc: compression is not supported yet.")
+	}
+	if err := c.Unmarshal(d, m); err != nil {
+		return transport.StreamErrorf(codes.Internal, "grpc: failed to unmarshal the received message %v", err)
 	}
 	return nil
 }
@@ -218,7 +323,7 @@ type rpcError struct {
 }
 
 func (e rpcError) Error() string {
-	return fmt.Sprintf("rpc error: code = %d desc = %q", e.code, e.desc)
+	return fmt.Sprintf("rpc error: code = %d desc = %s", e.code, e.desc)
 }
 
 // Code returns the error code for err if it was produced by the rpc system.
@@ -304,34 +409,10 @@ func convertCode(err error) codes.Code {
 	return codes.Unknown
 }
 
-const (
-	// how long to wait after the first failure before retrying
-	baseDelay = 1.0 * time.Second
-	// upper bound of backoff delay
-	maxDelay = 120 * time.Second
-	// backoff increases by this factor on each retry
-	backoffFactor = 1.6
-	// backoff is randomized downwards by this factor
-	backoffJitter = 0.2
-)
-
-func backoff(retries int) (t time.Duration) {
-	if retries == 0 {
-		return baseDelay
-	}
-	backoff, max := float64(baseDelay), float64(maxDelay)
-	for backoff < max && retries > 0 {
-		backoff *= backoffFactor
-		retries--
-	}
-	if backoff > max {
-		backoff = max
-	}
-	// Randomize backoff delays so that if a cluster of requests start at
-	// the same time, they won't operate in lockstep.
-	backoff *= 1 + backoffJitter*(rand.Float64()*2-1)
-	if backoff < 0 {
-		return 0
-	}
-	return time.Duration(backoff)
-}
+// SupportPackageIsVersion2 is referenced from generated protocol buffer files
+// to assert that that code is compatible with this version of the grpc package.
+//
+// This constant may be renamed in the future if a change in the generated code
+// requires a synchronised update of grpc-go and protoc-gen-go. This constant
+// should not be referenced from any other code.
+const SupportPackageIsVersion2 = true
diff --git a/vendor/src/google.golang.org/grpc/server.go b/vendor/src/google.golang.org/grpc/server.go
index 655e7d865..d3a8073d9 100644
--- a/vendor/src/google.golang.org/grpc/server.go
+++ b/vendor/src/google.golang.org/grpc/server.go
@@ -34,10 +34,12 @@
 package grpc
 
 import (
+	"bytes"
 	"errors"
 	"fmt"
 	"io"
 	"net"
+	"net/http"
 	"reflect"
 	"runtime"
 	"strings"
@@ -45,15 +47,17 @@ import (
 	"time"
 
 	"golang.org/x/net/context"
+	"golang.org/x/net/http2"
 	"golang.org/x/net/trace"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/internal"
 	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/transport"
 )
 
-type methodHandler func(srv interface{}, ctx context.Context, dec func(interface{}) error) (interface{}, error)
+type methodHandler func(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor UnaryServerInterceptor) (interface{}, error)
 
 // MethodDesc represents an RPC service's method specification.
 type MethodDesc struct {
@@ -81,10 +85,11 @@ type service struct {
 
 // Server is a gRPC server to serve RPC requests.
 type Server struct {
-	opts   options
-	mu     sync.Mutex
+	opts options
+
+	mu     sync.Mutex // guards following
 	lis    map[net.Listener]bool
-	conns  map[transport.ServerTransport]bool
+	conns  map[io.Closer]bool
 	m      map[string]*service // service name -> service info
 	events trace.EventLog
 }
@@ -92,7 +97,12 @@ type Server struct {
 type options struct {
 	creds                credentials.Credentials
 	codec                Codec
+	cp                   Compressor
+	dc                   Decompressor
+	unaryInt             UnaryServerInterceptor
+	streamInt            StreamServerInterceptor
 	maxConcurrentStreams uint32
+	useHandlerImpl       bool // use http.Handler-based server
 }
 
 // A ServerOption sets options.
@@ -105,6 +115,18 @@ func CustomCodec(codec Codec) ServerOption {
 	}
 }
 
+func RPCCompressor(cp Compressor) ServerOption {
+	return func(o *options) {
+		o.cp = cp
+	}
+}
+
+func RPCDecompressor(dc Decompressor) ServerOption {
+	return func(o *options) {
+		o.dc = dc
+	}
+}
+
 // MaxConcurrentStreams returns a ServerOption that will apply a limit on the number
 // of concurrent streams to each ServerTransport.
 func MaxConcurrentStreams(n uint32) ServerOption {
@@ -120,6 +142,29 @@ func Creds(c credentials.Credentials) ServerOption {
 	}
 }
 
+// UnaryInterceptor returns a ServerOption that sets the UnaryServerInterceptor for the
+// server. Only one unary interceptor can be installed. The construction of multiple
+// interceptors (e.g., chaining) can be implemented at the caller.
+func UnaryInterceptor(i UnaryServerInterceptor) ServerOption {
+	return func(o *options) {
+		if o.unaryInt != nil {
+			panic("The unary server interceptor has been set.")
+		}
+		o.unaryInt = i
+	}
+}
+
+// StreamInterceptor returns a ServerOption that sets the StreamServerInterceptor for the
+// server. Only one stream interceptor can be installed.
+func StreamInterceptor(i StreamServerInterceptor) ServerOption {
+	return func(o *options) {
+		if o.streamInt != nil {
+			panic("The stream server interceptor has been set.")
+		}
+		o.streamInt = i
+	}
+}
+
 // NewServer creates a gRPC server which has no service registered and has not
 // started to accept requests yet.
 func NewServer(opt ...ServerOption) *Server {
@@ -134,7 +179,7 @@ func NewServer(opt ...ServerOption) *Server {
 	s := &Server{
 		lis:   make(map[net.Listener]bool),
 		opts:  opts,
-		conns: make(map[transport.ServerTransport]bool),
+		conns: make(map[io.Closer]bool),
 		m:     make(map[string]*service),
 	}
 	if EnableTracing {
@@ -201,9 +246,17 @@ var (
 	ErrServerStopped = errors.New("grpc: the server has been stopped")
 )
 
+func (s *Server) useTransportAuthenticator(rawConn net.Conn) (net.Conn, credentials.AuthInfo, error) {
+	creds, ok := s.opts.creds.(credentials.TransportAuthenticator)
+	if !ok {
+		return rawConn, nil, nil
+	}
+	return creds.ServerHandshake(rawConn)
+}
+
 // Serve accepts incoming connections on the listener lis, creating a new
 // ServerTransport and service goroutine for each. The service goroutines
-// read gRPC request and then call the registered handlers to reply to them.
+// read gRPC requests and then call the registered handlers to reply to them.
 // Service returns when lis.Accept fails.
 func (s *Server) Serve(lis net.Listener) error {
 	s.mu.Lock()
@@ -221,74 +274,167 @@ func (s *Server) Serve(lis net.Listener) error {
 		s.mu.Unlock()
 	}()
 	for {
-		c, err := lis.Accept()
+		rawConn, err := lis.Accept()
 		if err != nil {
 			s.mu.Lock()
 			s.printf("done serving; Accept = %v", err)
 			s.mu.Unlock()
 			return err
 		}
-		var authInfo credentials.AuthInfo
-		if creds, ok := s.opts.creds.(credentials.TransportAuthenticator); ok {
-			var conn net.Conn
-			conn, authInfo, err = creds.ServerHandshake(c)
-			if err != nil {
-				s.mu.Lock()
-				s.errorf("ServerHandshake(%q) failed: %v", c.RemoteAddr(), err)
-				s.mu.Unlock()
-				grpclog.Println("grpc: Server.Serve failed to complete security handshake.")
-				continue
-			}
-			c = conn
-		}
-		s.mu.Lock()
-		if s.conns == nil {
-			s.mu.Unlock()
-			c.Close()
-			return nil
-		}
-		st, err := transport.NewServerTransport("http2", c, s.opts.maxConcurrentStreams, authInfo)
-		if err != nil {
-			s.errorf("NewServerTransport(%q) failed: %v", c.RemoteAddr(), err)
-			s.mu.Unlock()
-			c.Close()
-			grpclog.Println("grpc: Server.Serve failed to create ServerTransport: ", err)
-			continue
-		}
-		s.conns[st] = true
-		s.mu.Unlock()
-
-		go func() {
-			var wg sync.WaitGroup
-			st.HandleStreams(func(stream *transport.Stream) {
-				var trInfo *traceInfo
-				if EnableTracing {
-					trInfo = &traceInfo{
-						tr: trace.New("grpc.Recv."+methodFamily(stream.Method()), stream.Method()),
-					}
-					trInfo.firstLine.client = false
-					trInfo.firstLine.remoteAddr = st.RemoteAddr()
-					stream.TraceContext(trInfo.tr)
-					if dl, ok := stream.Context().Deadline(); ok {
-						trInfo.firstLine.deadline = dl.Sub(time.Now())
-					}
-				}
-				wg.Add(1)
-				go func() {
-					s.handleStream(st, stream, trInfo)
-					wg.Done()
-				}()
-			})
-			wg.Wait()
-			s.mu.Lock()
-			delete(s.conns, st)
-			s.mu.Unlock()
-		}()
+		// Start a new goroutine to deal with rawConn
+		// so we don't stall this Accept loop goroutine.
+		go s.handleRawConn(rawConn)
 	}
 }
 
-func (s *Server) sendResponse(t transport.ServerTransport, stream *transport.Stream, msg interface{}, pf payloadFormat, opts *transport.Options) error {
-	p, err := encode(s.opts.codec, msg, pf)
+// handleRawConn is run in its own goroutine and handles a just-accepted
+// connection that has not had any I/O performed on it yet.
+func (s *Server) handleRawConn(rawConn net.Conn) {
+	conn, authInfo, err := s.useTransportAuthenticator(rawConn)
+	if err != nil {
+		s.mu.Lock()
+		s.errorf("ServerHandshake(%q) failed: %v", rawConn.RemoteAddr(), err)
+		s.mu.Unlock()
+		grpclog.Printf("grpc: Server.Serve failed to complete security handshake from %q: %v", rawConn.RemoteAddr(), err)
+		rawConn.Close()
+		return
+	}
+
+	s.mu.Lock()
+	if s.conns == nil {
+		s.mu.Unlock()
+		conn.Close()
+		return
+	}
+	s.mu.Unlock()
+
+	if s.opts.useHandlerImpl {
+		s.serveUsingHandler(conn)
+	} else {
+		s.serveNewHTTP2Transport(conn, authInfo)
+	}
+}
+
+// serveNewHTTP2Transport sets up a new http/2 transport (using the
+// gRPC http2 server transport in transport/http2_server.go) and
+// serves streams on it.
+// This is run in its own goroutine (it does network I/O in
+// transport.NewServerTransport).
+func (s *Server) serveNewHTTP2Transport(c net.Conn, authInfo credentials.AuthInfo) {
+	st, err := transport.NewServerTransport("http2", c, s.opts.maxConcurrentStreams, authInfo)
+	if err != nil {
+		s.mu.Lock()
+		s.errorf("NewServerTransport(%q) failed: %v", c.RemoteAddr(), err)
+		s.mu.Unlock()
+		c.Close()
+		grpclog.Println("grpc: Server.Serve failed to create ServerTransport: ", err)
+		return
+	}
+	if !s.addConn(st) {
+		st.Close()
+		return
+	}
+	s.serveStreams(st)
+}
+
+func (s *Server) serveStreams(st transport.ServerTransport) {
+	defer s.removeConn(st)
+	defer st.Close()
+	var wg sync.WaitGroup
+	st.HandleStreams(func(stream *transport.Stream) {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			s.handleStream(st, stream, s.traceInfo(st, stream))
+		}()
+	})
+	wg.Wait()
+}
+
+var _ http.Handler = (*Server)(nil)
+
+// serveUsingHandler is called from handleRawConn when s is configured
+// to handle requests via the http.Handler interface. It sets up a
+// net/http.Server to handle the just-accepted conn. The http.Server
+// is configured to route all incoming requests (all HTTP/2 streams)
+// to ServeHTTP, which creates a new ServerTransport for each stream.
+// serveUsingHandler blocks until conn closes.
+//
+// This codepath is only used when Server.TestingUseHandlerImpl has
+// been configured. This lets the end2end tests exercise the ServeHTTP
+// method as one of the environment types.
+//
+// conn is the *tls.Conn that's already been authenticated.
+func (s *Server) serveUsingHandler(conn net.Conn) {
+	if !s.addConn(conn) {
+		conn.Close()
+		return
+	}
+	defer s.removeConn(conn)
+	h2s := &http2.Server{
+		MaxConcurrentStreams: s.opts.maxConcurrentStreams,
+	}
+	h2s.ServeConn(conn, &http2.ServeConnOpts{
+		Handler: s,
+	})
+}
+
+func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	st, err := transport.NewServerHandlerTransport(w, r)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	if !s.addConn(st) {
+		st.Close()
+		return
+	}
+	defer s.removeConn(st)
+	s.serveStreams(st)
+}
+
+// traceInfo returns a traceInfo and associates it with stream, if tracing is enabled.
+// If tracing is not enabled, it returns nil.
+func (s *Server) traceInfo(st transport.ServerTransport, stream *transport.Stream) (trInfo *traceInfo) {
+	if !EnableTracing {
+		return nil
+	}
+	trInfo = &traceInfo{
+		tr: trace.New("grpc.Recv."+methodFamily(stream.Method()), stream.Method()),
+	}
+	trInfo.firstLine.client = false
+	trInfo.firstLine.remoteAddr = st.RemoteAddr()
+	stream.TraceContext(trInfo.tr)
+	if dl, ok := stream.Context().Deadline(); ok {
+		trInfo.firstLine.deadline = dl.Sub(time.Now())
+	}
+	return trInfo
+}
+
+func (s *Server) addConn(c io.Closer) bool {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.conns == nil {
+		return false
+	}
+	s.conns[c] = true
+	return true
+}
+
+func (s *Server) removeConn(c io.Closer) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.conns != nil {
+		delete(s.conns, c)
+	}
+}
+
+func (s *Server) sendResponse(t transport.ServerTransport, stream *transport.Stream, msg interface{}, cp Compressor, opts *transport.Options) error {
+	var cbuf *bytes.Buffer
+	if cp != nil {
+		cbuf = new(bytes.Buffer)
+	}
+	p, err := encode(s.opts.codec, msg, cp, cbuf)
 	if err != nil {
 		// This typically indicates a fatal issue (e.g., memory
 		// corruption or hardware faults) the application program
@@ -314,97 +460,130 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 			}
 		}()
 	}
-	p := &parser{s: stream}
+	p := &parser{r: stream}
 	for {
 		pf, req, err := p.recvMsg()
 		if err == io.EOF {
 			// The entire stream is done (for unary RPC only).
 			return err
 		}
+		if err == io.ErrUnexpectedEOF {
+			err = transport.StreamError{Code: codes.Internal, Desc: "io.ErrUnexpectedEOF"}
+		}
 		if err != nil {
 			switch err := err.(type) {
 			case transport.ConnectionError:
 				// Nothing to do here.
 			case transport.StreamError:
 				if err := t.WriteStatus(stream, err.Code, err.Desc); err != nil {
-					grpclog.Printf("grpc: Server.processUnaryRPC failed to write status: %v", err)
+					grpclog.Printf("grpc: Server.processUnaryRPC failed to write status %v", err)
 				}
 			default:
 				panic(fmt.Sprintf("grpc: Unexpected error (%T) from recvMsg: %v", err, err))
 			}
 			return err
 		}
-		switch pf {
-		case compressionNone:
-			statusCode := codes.OK
-			statusDesc := ""
-			df := func(v interface{}) error {
-				if err := s.opts.codec.Unmarshal(req, v); err != nil {
-					return err
+
+		if err := checkRecvPayload(pf, stream.RecvCompress(), s.opts.dc); err != nil {
+			switch err := err.(type) {
+			case transport.StreamError:
+				if err := t.WriteStatus(stream, err.Code, err.Desc); err != nil {
+					grpclog.Printf("grpc: Server.processUnaryRPC failed to write status %v", err)
 				}
-				if trInfo != nil {
-					trInfo.tr.LazyLog(&payload{sent: false, msg: v}, true)
-				}
-				return nil
-			}
-			reply, appErr := md.Handler(srv.server, stream.Context(), df)
-			if appErr != nil {
-				if err, ok := appErr.(rpcError); ok {
-					statusCode = err.code
-					statusDesc = err.desc
-				} else {
-					statusCode = convertCode(appErr)
-					statusDesc = appErr.Error()
-				}
-				if trInfo != nil && statusCode != codes.OK {
-					trInfo.tr.LazyLog(stringer(statusDesc), true)
-					trInfo.tr.SetError()
+			default:
+				if err := t.WriteStatus(stream, codes.Internal, err.Error()); err != nil {
+					grpclog.Printf("grpc: Server.processUnaryRPC failed to write status %v", err)
 				}
 
-				if err := t.WriteStatus(stream, statusCode, statusDesc); err != nil {
-					grpclog.Printf("grpc: Server.processUnaryRPC failed to write status: %v", err)
+			}
+			return err
+		}
+		statusCode := codes.OK
+		statusDesc := ""
+		df := func(v interface{}) error {
+			if pf == compressionMade {
+				var err error
+				req, err = s.opts.dc.Do(bytes.NewReader(req))
+				if err != nil {
+					if err := t.WriteStatus(stream, codes.Internal, err.Error()); err != nil {
+						grpclog.Printf("grpc: Server.processUnaryRPC failed to write status %v", err)
+					}
 					return err
 				}
-				return nil
 			}
-			if trInfo != nil {
-				trInfo.tr.LazyLog(stringer("OK"), false)
-			}
-			opts := &transport.Options{
-				Last:  true,
-				Delay: false,
-			}
-			if err := s.sendResponse(t, stream, reply, compressionNone, opts); err != nil {
-				switch err := err.(type) {
-				case transport.ConnectionError:
-					// Nothing to do here.
-				case transport.StreamError:
-					statusCode = err.Code
-					statusDesc = err.Desc
-				default:
-					statusCode = codes.Unknown
-					statusDesc = err.Error()
-				}
+			if err := s.opts.codec.Unmarshal(req, v); err != nil {
 				return err
 			}
 			if trInfo != nil {
-				trInfo.tr.LazyLog(&payload{sent: true, msg: reply}, true)
+				trInfo.tr.LazyLog(&payload{sent: false, msg: v}, true)
 			}
-			return t.WriteStatus(stream, statusCode, statusDesc)
-		default:
-			panic(fmt.Sprintf("payload format to be supported: %d", pf))
+			return nil
 		}
+		reply, appErr := md.Handler(srv.server, stream.Context(), df, s.opts.unaryInt)
+		if appErr != nil {
+			if err, ok := appErr.(rpcError); ok {
+				statusCode = err.code
+				statusDesc = err.desc
+			} else {
+				statusCode = convertCode(appErr)
+				statusDesc = appErr.Error()
+			}
+			if trInfo != nil && statusCode != codes.OK {
+				trInfo.tr.LazyLog(stringer(statusDesc), true)
+				trInfo.tr.SetError()
+			}
+			if err := t.WriteStatus(stream, statusCode, statusDesc); err != nil {
+				grpclog.Printf("grpc: Server.processUnaryRPC failed to write status: %v", err)
+				return err
+			}
+			return nil
+		}
+		if trInfo != nil {
+			trInfo.tr.LazyLog(stringer("OK"), false)
+		}
+		opts := &transport.Options{
+			Last:  true,
+			Delay: false,
+		}
+		if s.opts.cp != nil {
+			stream.SetSendCompress(s.opts.cp.Type())
+		}
+		if err := s.sendResponse(t, stream, reply, s.opts.cp, opts); err != nil {
+			switch err := err.(type) {
+			case transport.ConnectionError:
+				// Nothing to do here.
+			case transport.StreamError:
+				statusCode = err.Code
+				statusDesc = err.Desc
+			default:
+				statusCode = codes.Unknown
+				statusDesc = err.Error()
+			}
+			return err
+		}
+		if trInfo != nil {
+			trInfo.tr.LazyLog(&payload{sent: true, msg: reply}, true)
+		}
+		return t.WriteStatus(stream, statusCode, statusDesc)
 	}
 }
 
 func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transport.Stream, srv *service, sd *StreamDesc, trInfo *traceInfo) (err error) {
+	if s.opts.cp != nil {
+		stream.SetSendCompress(s.opts.cp.Type())
+	}
 	ss := &serverStream{
 		t:      t,
 		s:      stream,
-		p:      &parser{s: stream},
+		p:      &parser{r: stream},
 		codec:  s.opts.codec,
+		cp:     s.opts.cp,
+		dc:     s.opts.dc,
 		trInfo: trInfo,
 	}
+	if ss.cp != nil {
+		ss.cbuf = new(bytes.Buffer)
+	}
 	if trInfo != nil {
 		trInfo.tr.LazyLog(&trInfo.firstLine, false)
 		defer func() {
@@ -418,10 +597,24 @@ func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transp
 			ss.mu.Unlock()
 		}()
 	}
-	if appErr := sd.Handler(srv.server, ss); appErr != nil {
+	var appErr error
+	if s.opts.streamInt == nil {
+		appErr = sd.Handler(srv.server, ss)
+	} else {
+		info := &StreamServerInfo{
+			FullMethod:     stream.Method(),
+			IsClientStream: sd.ClientStreams,
+			IsServerStream: sd.ServerStreams,
+		}
+		appErr = s.opts.streamInt(srv.server, ss, info, sd.Handler)
+	}
+	if appErr != nil {
 		if err, ok := appErr.(rpcError); ok {
 			ss.statusCode = err.code
 			ss.statusDesc = err.desc
+		} else if err, ok := appErr.(transport.StreamError); ok {
+			ss.statusCode = err.Code
+			ss.statusDesc = err.Desc
 		} else {
 			ss.statusCode = convertCode(appErr)
 			ss.statusDesc = appErr.Error()
@@ -509,8 +702,11 @@ func (s *Server) handleStream(t transport.ServerTransport, stream *transport.Str
 	}
 }
 
-// Stop stops the gRPC server. Once Stop returns, the server stops accepting
-// connection requests and closes all the connected connections.
+// Stop stops the gRPC server. It immediately closes all open
+// connections and listeners.
+// It cancels all active RPCs on the server side and the corresponding
+// pending RPCs on the client side will get notified by connection
+// errors.
 func (s *Server) Stop() {
 	s.mu.Lock()
 	listeners := s.lis
@@ -518,12 +714,14 @@ func (s *Server) Stop() {
 	cs := s.conns
 	s.conns = nil
 	s.mu.Unlock()
+
 	for lis := range listeners {
 		lis.Close()
 	}
 	for c := range cs {
 		c.Close()
 	}
+
 	s.mu.Lock()
 	if s.events != nil {
 		s.events.Finish()
@@ -532,14 +730,23 @@ func (s *Server) Stop() {
 	s.mu.Unlock()
 }
 
-// TestingCloseConns closes all exiting transports but keeps s.lis accepting new
-// connections. This is for test only now.
-func (s *Server) TestingCloseConns() {
+func init() {
+	internal.TestingCloseConns = func(arg interface{}) {
+		arg.(*Server).testingCloseConns()
+	}
+	internal.TestingUseHandlerImpl = func(arg interface{}) {
+		arg.(*Server).opts.useHandlerImpl = true
+	}
+}
+
+// testingCloseConns closes all existing transports but keeps s.lis
+// accepting new connections.
+func (s *Server) testingCloseConns() {
 	s.mu.Lock()
 	for c := range s.conns {
 		c.Close()
+		delete(s.conns, c)
 	}
-	s.conns = make(map[transport.ServerTransport]bool)
 	s.mu.Unlock()
 }
 
diff --git a/vendor/src/google.golang.org/grpc/stream.go b/vendor/src/google.golang.org/grpc/stream.go
index 0ee572c27..565fc3cd0 100644
--- a/vendor/src/google.golang.org/grpc/stream.go
+++ b/vendor/src/google.golang.org/grpc/stream.go
@@ -34,6 +34,7 @@
 package grpc
 
 import (
+	"bytes"
 	"errors"
 	"io"
 	"sync"
@@ -46,12 +47,14 @@ import (
 	"google.golang.org/grpc/transport"
 )
 
-type streamHandler func(srv interface{}, stream ServerStream) error
+// StreamHandler defines the handler called by gRPC server to complete the
+// execution of a streaming RPC.
+type StreamHandler func(srv interface{}, stream ServerStream) error
 
 // StreamDesc represents a streaming RPC service's method specification.
 type StreamDesc struct {
 	StreamName string
-	Handler    streamHandler
+	Handler    StreamHandler
 
 	// At least one of these is true.
 	ServerStreams bool
@@ -66,18 +69,19 @@ type Stream interface {
 	// breaks.
 	// On error, it aborts the stream and returns an RPC status on client
 	// side. On server side, it simply returns the error to the caller.
-	// SendMsg is called by generated code.
+	// SendMsg is called by generated code. Also Users can call SendMsg
+	// directly when it is really needed in their use cases.
 	SendMsg(m interface{}) error
 	// RecvMsg blocks until it receives a message or the stream is
 	// done. On client side, it returns io.EOF when the stream is done. On
-	// any other error, it aborts the streama nd returns an RPC status. On
+	// any other error, it aborts the stream and returns an RPC status. On
 	// server side, it simply returns the error to the caller.
 	RecvMsg(m interface{}) error
 }
 
 // ClientStream defines the interface a client stream has to satify.
 type ClientStream interface {
-	// Header returns the header metedata received from the server if there
+	// Header returns the header metadata received from the server if there
 	// is any. It blocks if the metadata is not ready to read.
 	Header() (metadata.MD, error)
 	// Trailer returns the trailer metadata from the server. It must be called
@@ -108,12 +112,22 @@ func NewClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, meth
 	callHdr := &transport.CallHdr{
 		Host:   cc.authority,
 		Method: method,
+		Flush:  desc.ServerStreams && desc.ClientStreams,
+	}
+	if cc.dopts.cp != nil {
+		callHdr.SendCompress = cc.dopts.cp.Type()
 	}
 	cs := &clientStream{
 		desc:    desc,
 		codec:   cc.dopts.codec,
+		cp:      cc.dopts.cp,
+		dc:      cc.dopts.dc,
 		tracing: EnableTracing,
 	}
+	if cc.dopts.cp != nil {
+		callHdr.SendCompress = cc.dopts.cp.Type()
+		cs.cbuf = new(bytes.Buffer)
+	}
 	if cs.tracing {
 		cs.trInfo.tr = trace.New("grpc.Sent."+methodFamily(method), method)
 		cs.trInfo.firstLine.client = true
@@ -125,16 +139,23 @@ func NewClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, meth
 	}
 	s, err := t.NewStream(ctx, callHdr)
 	if err != nil {
+		cs.finish(err)
 		return nil, toRPCErr(err)
 	}
 	cs.t = t
 	cs.s = s
-	cs.p = &parser{s: s}
+	cs.p = &parser{r: s}
 	// Listen on ctx.Done() to detect cancellation when there is no pending
 	// I/O operations on this stream.
 	go func() {
-		<-s.Context().Done()
-		cs.closeTransportStream(transport.ContextErr(s.Context().Err()))
+		select {
+		case <-t.Error():
+			// Incur transport error, simply exit.
+		case <-s.Context().Done():
+			err := s.Context().Err()
+			cs.finish(err)
+			cs.closeTransportStream(transport.ContextErr(err))
+		}
 	}()
 	return cs, nil
 }
@@ -146,6 +167,9 @@ type clientStream struct {
 	p     *parser
 	desc  *StreamDesc
 	codec Codec
+	cp    Compressor
+	cbuf  *bytes.Buffer
+	dc    Decompressor
 
 	tracing bool // set to EnableTracing when the clientStream is created.
 
@@ -183,6 +207,9 @@ func (cs *clientStream) SendMsg(m interface{}) (err error) {
 		cs.mu.Unlock()
 	}
 	defer func() {
+		if err != nil {
+			cs.finish(err)
+		}
 		if err == nil || err == io.EOF {
 			return
 		}
@@ -191,7 +218,12 @@ func (cs *clientStream) SendMsg(m interface{}) (err error) {
 		}
 		err = toRPCErr(err)
 	}()
-	out, err := encode(cs.codec, m, compressionNone)
+	out, err := encode(cs.codec, m, cs.cp, cs.cbuf)
+	defer func() {
+		if cs.cbuf != nil {
+			cs.cbuf.Reset()
+		}
+	}()
 	if err != nil {
 		return transport.StreamErrorf(codes.Internal, "grpc: %v", err)
 	}
@@ -199,7 +231,7 @@ func (cs *clientStream) SendMsg(m interface{}) (err error) {
 }
 
 func (cs *clientStream) RecvMsg(m interface{}) (err error) {
-	err = recv(cs.p, cs.codec, m)
+	err = recv(cs.p, cs.codec, cs.s, cs.dc, m)
 	defer func() {
 		// err != nil indicates the termination of the stream.
 		if err != nil {
@@ -218,16 +250,17 @@ func (cs *clientStream) RecvMsg(m interface{}) (err error) {
 			return
 		}
 		// Special handling for client streaming rpc.
-		err = recv(cs.p, cs.codec, m)
+		err = recv(cs.p, cs.codec, cs.s, cs.dc, m)
 		cs.closeTransportStream(err)
 		if err == nil {
 			return toRPCErr(errors.New("grpc: client streaming protocol violation: get <nil>, want <EOF>"))
 		}
 		if err == io.EOF {
 			if cs.s.StatusCode() == codes.OK {
+				cs.finish(err)
 				return nil
 			}
-			return Errorf(cs.s.StatusCode(), cs.s.StatusDesc())
+			return Errorf(cs.s.StatusCode(), "%s", cs.s.StatusDesc())
 		}
 		return toRPCErr(err)
 	}
@@ -239,13 +272,18 @@ func (cs *clientStream) RecvMsg(m interface{}) (err error) {
 			// Returns io.EOF to indicate the end of the stream.
 			return
 		}
-		return Errorf(cs.s.StatusCode(), cs.s.StatusDesc())
+		return Errorf(cs.s.StatusCode(), "%s", cs.s.StatusDesc())
 	}
 	return toRPCErr(err)
 }
 
 func (cs *clientStream) CloseSend() (err error) {
 	err = cs.t.Write(cs.s, nil, &transport.Options{Last: true})
+	defer func() {
+		if err != nil {
+			cs.finish(err)
+		}
+	}()
 	if err == nil || err == io.EOF {
 		return
 	}
@@ -303,6 +341,9 @@ type serverStream struct {
 	s          *transport.Stream
 	p          *parser
 	codec      Codec
+	cp         Compressor
+	dc         Decompressor
+	cbuf       *bytes.Buffer
 	statusCode codes.Code
 	statusDesc string
 	trInfo     *traceInfo
@@ -341,7 +382,12 @@ func (ss *serverStream) SendMsg(m interface{}) (err error) {
 			ss.mu.Unlock()
 		}
 	}()
-	out, err := encode(ss.codec, m, compressionNone)
+	out, err := encode(ss.codec, m, ss.cp, ss.cbuf)
+	defer func() {
+		if ss.cbuf != nil {
+			ss.cbuf.Reset()
+		}
+	}()
 	if err != nil {
 		err = transport.StreamErrorf(codes.Internal, "grpc: %v", err)
 		return err
@@ -364,5 +410,5 @@ func (ss *serverStream) RecvMsg(m interface{}) (err error) {
 			ss.mu.Unlock()
 		}
 	}()
-	return recv(ss.p, ss.codec, m)
+	return recv(ss.p, ss.codec, ss.s, ss.dc, m)
 }
diff --git a/vendor/src/google.golang.org/grpc/transport/control.go b/vendor/src/google.golang.org/grpc/transport/control.go
index f6b38a5a6..7e9bdf335 100644
--- a/vendor/src/google.golang.org/grpc/transport/control.go
+++ b/vendor/src/google.golang.org/grpc/transport/control.go
@@ -56,43 +56,33 @@ type windowUpdate struct {
 	increment uint32
 }
 
-func (windowUpdate) isItem() bool {
-	return true
-}
+func (*windowUpdate) item() {}
 
 type settings struct {
 	ack bool
 	ss  []http2.Setting
 }
 
-func (settings) isItem() bool {
-	return true
-}
+func (*settings) item() {}
 
 type resetStream struct {
 	streamID uint32
 	code     http2.ErrCode
 }
 
-func (resetStream) isItem() bool {
-	return true
-}
+func (*resetStream) item() {}
 
 type flushIO struct {
 }
 
-func (flushIO) isItem() bool {
-	return true
-}
+func (*flushIO) item() {}
 
 type ping struct {
 	ack  bool
 	data [8]byte
 }
 
-func (ping) isItem() bool {
-	return true
-}
+func (*ping) item() {}
 
 // quotaPool is a pool which accumulates the quota and sends it to acquire()
 // when it is available.
@@ -172,10 +162,6 @@ func (qb *quotaPool) acquire() <-chan int {
 type inFlow struct {
 	// The inbound flow control limit for pending data.
 	limit uint32
-	// conn points to the shared connection-level inFlow that is shared
-	// by all streams on that conn. It is nil for the inFlow on the conn
-	// directly.
-	conn *inFlow
 
 	mu sync.Mutex
 	// pendingData is the overall data which have been received but not been
@@ -186,75 +172,39 @@ type inFlow struct {
 	pendingUpdate uint32
 }
 
-// onData is invoked when some data frame is received. It increments not only its
-// own pendingData but also that of the associated connection-level flow.
+// onData is invoked when some data frame is received. It updates pendingData.
 func (f *inFlow) onData(n uint32) error {
-	if n == 0 {
-		return nil
-	}
 	f.mu.Lock()
 	defer f.mu.Unlock()
-	if f.pendingData+f.pendingUpdate+n > f.limit {
-		return fmt.Errorf("recieved %d-bytes data exceeding the limit %d bytes", f.pendingData+f.pendingUpdate+n, f.limit)
-	}
-	if f.conn != nil {
-		if err := f.conn.onData(n); err != nil {
-			return ConnectionErrorf("%v", err)
-		}
-	}
 	f.pendingData += n
+	if f.pendingData+f.pendingUpdate > f.limit {
+		return fmt.Errorf("received %d-bytes data exceeding the limit %d bytes", f.pendingData+f.pendingUpdate, f.limit)
+	}
 	return nil
 }
 
-// connOnRead updates the connection level states when the application consumes data.
-func (f *inFlow) connOnRead(n uint32) uint32 {
-	if n == 0 || f.conn != nil {
-		return 0
-	}
+// onRead is invoked when the application reads the data. It returns the window size
+// to be sent to the peer.
+func (f *inFlow) onRead(n uint32) uint32 {
 	f.mu.Lock()
 	defer f.mu.Unlock()
+	if f.pendingData == 0 {
+		return 0
+	}
 	f.pendingData -= n
 	f.pendingUpdate += n
 	if f.pendingUpdate >= f.limit/4 {
-		ret := f.pendingUpdate
+		wu := f.pendingUpdate
 		f.pendingUpdate = 0
-		return ret
+		return wu
 	}
 	return 0
 }
 
-// onRead is invoked when the application reads the data. It returns the window updates
-// for both stream and connection level.
-func (f *inFlow) onRead(n uint32) (swu, cwu uint32) {
-	if n == 0 {
-		return
-	}
-	f.mu.Lock()
-	defer f.mu.Unlock()
-	if f.pendingData == 0 {
-		// pendingData has been adjusted by restoreConn.
-		return
-	}
-	f.pendingData -= n
-	f.pendingUpdate += n
-	if f.pendingUpdate >= f.limit/4 {
-		swu = f.pendingUpdate
-		f.pendingUpdate = 0
-	}
-	cwu = f.conn.connOnRead(n)
-	return
-}
-
-// restoreConn is invoked when a stream is terminated. It removes its stake in
-// the connection-level flow and resets its own state.
-func (f *inFlow) restoreConn() uint32 {
-	if f.conn == nil {
-		return 0
-	}
+func (f *inFlow) resetPendingData() uint32 {
 	f.mu.Lock()
 	defer f.mu.Unlock()
 	n := f.pendingData
 	f.pendingData = 0
-	f.pendingUpdate = 0
-	return f.conn.connOnRead(n)
+	return n
 }
diff --git a/vendor/src/google.golang.org/grpc/transport/handler_server.go b/vendor/src/google.golang.org/grpc/transport/handler_server.go
new file mode 100644
index 000000000..fef541dba
--- /dev/null
+++ b/vendor/src/google.golang.org/grpc/transport/handler_server.go
@@ -0,0 +1,383 @@
+/*
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+// This file is the implementation of a gRPC server using HTTP/2 which
+// uses the standard Go http2 Server implementation (via the
+// http.Handler interface), rather than speaking low-level HTTP/2
+// frames itself. It is the implementation of *grpc.Server.ServeHTTP.
+
+package transport
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"strings"
+	"sync"
+	"time"
+
+	"golang.org/x/net/context"
+	"golang.org/x/net/http2"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/peer"
+)
+
+// NewServerHandlerTransport returns a ServerTransport handling gRPC
+// from inside an http.Handler. It requires that the http Server
+// supports HTTP/2.
+func NewServerHandlerTransport(w http.ResponseWriter, r *http.Request) (ServerTransport, error) {
+	if r.ProtoMajor != 2 {
+		return nil, errors.New("gRPC requires HTTP/2")
+	}
+	if r.Method != "POST" {
+		return nil, errors.New("invalid gRPC request method")
+	}
+	if !strings.Contains(r.Header.Get("Content-Type"), "application/grpc") {
+		return nil, errors.New("invalid gRPC request content-type")
+	}
+	if _, ok := w.(http.Flusher); !ok {
+		return nil, errors.New("gRPC requires a ResponseWriter supporting http.Flusher")
+	}
+	if _, ok := w.(http.CloseNotifier); !ok {
+		return nil, errors.New("gRPC requires a ResponseWriter supporting http.CloseNotifier")
+	}
+
+	st := &serverHandlerTransport{
+		rw:       w,
+		req:      r,
+		closedCh: make(chan struct{}),
+		writes:   make(chan func()),
+	}
+
+	if v := r.Header.Get("grpc-timeout"); v != "" {
+		to, err := timeoutDecode(v)
+		if err != nil {
+			return nil, StreamErrorf(codes.Internal, "malformed time-out: %v", err)
+		}
+		st.timeoutSet = true
+		st.timeout = to
+	}
+
+	var metakv []string
+	for k, vv := range r.Header {
+		k = strings.ToLower(k)
+		if isReservedHeader(k) {
+			continue
+		}
+		for _, v := range vv {
+			if k == "user-agent" {
+				// user-agent is special. Copying logic of http_util.go.
+				if i := strings.LastIndex(v, " "); i == -1 {
+					// There is no application user agent string being set
+					continue
+				} else {
+					v = v[:i]
+				}
+			}
+			metakv = append(metakv, k, v)
+
+		}
+	}
+	st.headerMD = metadata.Pairs(metakv...)
+
+	return st, nil
+}
+
+// serverHandlerTransport is an implementation of ServerTransport
+// which replies to exactly one gRPC request (exactly one HTTP request),
+// using the net/http.Handler interface. This http.Handler is guaranteed
+// at this point to be speaking over HTTP/2, so it's able to speak valid
+// gRPC.
+type serverHandlerTransport struct {
+	rw               http.ResponseWriter
+	req              *http.Request
+	timeoutSet       bool
+	timeout          time.Duration
+	didCommonHeaders bool
+
+	headerMD metadata.MD
+
+	closeOnce sync.Once
+	closedCh  chan struct{} // closed on Close
+
+	// writes is a channel of code to run serialized in the
+	// ServeHTTP (HandleStreams) goroutine. The channel is closed
+	// when WriteStatus is called.
+	writes chan func()
+}
+
+func (ht *serverHandlerTransport) Close() error {
+	ht.closeOnce.Do(ht.closeCloseChanOnce)
+	return nil
+}
+
+func (ht *serverHandlerTransport) closeCloseChanOnce() { close(ht.closedCh) }
+
+func (ht *serverHandlerTransport) RemoteAddr() net.Addr { return strAddr(ht.req.RemoteAddr) }
+
+// strAddr is a net.Addr backed by either a TCP "ip:port" string, or
+// the empty string if unknown.
+type strAddr string
+
+func (a strAddr) Network() string {
+	if a != "" {
+		// Per the documentation on net/http.Request.RemoteAddr, if this is
+		// set, it's set to the IP:port of the peer (hence, TCP):
+		// https://golang.org/pkg/net/http/#Request
+		//
+		// If we want to support Unix sockets later, we can
+		// add our own grpc-specific convention within the
+		// grpc codebase to set RemoteAddr to a different
+		// format, or probably better: we can attach it to the
+		// context and use that from serverHandlerTransport.RemoteAddr.
+		return "tcp"
+	}
+	return ""
+}
+
+func (a strAddr) String() string { return string(a) }
+
+// do runs fn in the ServeHTTP goroutine.
+func (ht *serverHandlerTransport) do(fn func()) error {
+	select {
+	case ht.writes <- fn:
+		return nil
+	case <-ht.closedCh:
+		return ErrConnClosing
+	}
+}
+
+func (ht *serverHandlerTransport) WriteStatus(s *Stream, statusCode codes.Code, statusDesc string) error {
+	err := ht.do(func() {
+		ht.writeCommonHeaders(s)
+
+		// And flush, in case no header or body has been sent yet.
+		// This forces a separation of headers and trailers if this is the
+		// first call (for example, in end2end tests's TestNoService).
+		ht.rw.(http.Flusher).Flush()
+
+		h := ht.rw.Header()
+		h.Set("Grpc-Status", fmt.Sprintf("%d", statusCode))
+		if statusDesc != "" {
+			h.Set("Grpc-Message", statusDesc)
+		}
+		if md := s.Trailer(); len(md) > 0 {
+			for k, vv := range md {
+				for _, v := range vv {
+					// http2 ResponseWriter mechanism to
+					// send undeclared Trailers after the
+					// headers have possibly been written.
+					h.Add(http2.TrailerPrefix+k, v)
+				}
+			}
+		}
+	})
+	close(ht.writes)
+	return err
+}
+
+// writeCommonHeaders sets common headers on the first write
+// call (Write, WriteHeader, or WriteStatus).
+func (ht *serverHandlerTransport) writeCommonHeaders(s *Stream) {
+	if ht.didCommonHeaders {
+		return
+	}
+	ht.didCommonHeaders = true
+
+	h := ht.rw.Header()
+	h["Date"] = nil // suppress Date to make tests happy; TODO: restore
+	h.Set("Content-Type", "application/grpc")
+
+	// Predeclare trailers we'll set later in WriteStatus (after the body).
+	// This is a SHOULD in the HTTP RFC, and the way you add (known)
+	// Trailers per the net/http.ResponseWriter contract.
+	// See https://golang.org/pkg/net/http/#ResponseWriter
+	// and https://golang.org/pkg/net/http/#example_ResponseWriter_trailers
+	h.Add("Trailer", "Grpc-Status")
+	h.Add("Trailer", "Grpc-Message")
+
+	if s.sendCompress != "" {
+		h.Set("Grpc-Encoding", s.sendCompress)
+	}
+}
+
+func (ht *serverHandlerTransport) Write(s *Stream, data []byte, opts *Options) error {
+	return ht.do(func() {
+		ht.writeCommonHeaders(s)
+		ht.rw.Write(data)
+		if !opts.Delay {
+			ht.rw.(http.Flusher).Flush()
+		}
+	})
+}
+
+func (ht *serverHandlerTransport) WriteHeader(s *Stream, md metadata.MD) error {
+	return ht.do(func() {
+		ht.writeCommonHeaders(s)
+		h := ht.rw.Header()
+		for k, vv := range md {
+			for _, v := range vv {
+				h.Add(k, v)
+			}
+		}
+		ht.rw.WriteHeader(200)
+		ht.rw.(http.Flusher).Flush()
+	})
+}
+
+func (ht *serverHandlerTransport) HandleStreams(startStream func(*Stream)) {
+	// With this transport type there will be exactly 1 stream: this HTTP request.
+
+	var ctx context.Context
+	var cancel context.CancelFunc
+	if ht.timeoutSet {
+		ctx, cancel = context.WithTimeout(context.Background(), ht.timeout)
+	} else {
+		ctx, cancel = context.WithCancel(context.Background())
+	}
+
+	// requestOver is closed when either the request's context is done
+	// or the status has been written via WriteStatus.
+	requestOver := make(chan struct{})
+
+	// clientGone receives a single value if peer is gone, either
+	// because the underlying connection is dead or because the
+	// peer sends an http2 RST_STREAM.
+	clientGone := ht.rw.(http.CloseNotifier).CloseNotify()
+	go func() {
+		select {
+		case <-requestOver:
+			return
+		case <-ht.closedCh:
+		case <-clientGone:
+		}
+		cancel()
+	}()
+
+	req := ht.req
+
+	s := &Stream{
+		id:            0,            // irrelevant
+		windowHandler: func(int) {}, // nothing
+		cancel:        cancel,
+		buf:           newRecvBuffer(),
+		st:            ht,
+		method:        req.URL.Path,
+		recvCompress:  req.Header.Get("grpc-encoding"),
+	}
+	pr := &peer.Peer{
+		Addr: ht.RemoteAddr(),
+	}
+	if req.TLS != nil {
+		pr.AuthInfo = credentials.TLSInfo{*req.TLS}
+	}
+	ctx = metadata.NewContext(ctx, ht.headerMD)
+	ctx = peer.NewContext(ctx, pr)
+	s.ctx = newContextWithStream(ctx, s)
+	s.dec = &recvBufferReader{ctx: s.ctx, recv: s.buf}
+
+	// readerDone is closed when the Body.Read-ing goroutine exits.
+	readerDone := make(chan struct{})
+	go func() {
+		defer close(readerDone)
+
+		// TODO: minimize garbage, optimize recvBuffer code/ownership
+		const readSize = 8196
+		for buf := make([]byte, readSize); ; {
+			n, err := req.Body.Read(buf)
+			if n > 0 {
+				s.buf.put(&recvMsg{data: buf[:n:n]})
+				buf = buf[n:]
+			}
+			if err != nil {
+				s.buf.put(&recvMsg{err: mapRecvMsgError(err)})
+				return
+			}
+			if len(buf) == 0 {
+				buf = make([]byte, readSize)
+			}
+		}
+	}()
+
+	// startStream is provided by the *grpc.Server's serveStreams.
+	// It starts a goroutine serving s and exits immediately.
+	// The goroutine that is started is the one that then calls
+	// into ht, calling WriteHeader, Write, WriteStatus, Close, etc.
+	startStream(s)
+
+	ht.runStream()
+	close(requestOver)
+
+	// Wait for reading goroutine to finish.
+	req.Body.Close()
+	<-readerDone
+}
+
+func (ht *serverHandlerTransport) runStream() {
+	for {
+		select {
+		case fn, ok := <-ht.writes:
+			if !ok {
+				return
+			}
+			fn()
+		case <-ht.closedCh:
+			return
+		}
+	}
+}
+
+// mapRecvMsgError returns the non-nil err into the appropriate
+// error value as expected by callers of *grpc.parser.recvMsg.
+// In particular, in can only be:
+//   * io.EOF
+//   * io.ErrUnexpectedEOF
+//   * of type transport.ConnectionError
+//   * of type transport.StreamError
+func mapRecvMsgError(err error) error {
+	if err == io.EOF || err == io.ErrUnexpectedEOF {
+		return err
+	}
+	if se, ok := err.(http2.StreamError); ok {
+		if code, ok := http2ErrConvTab[se.Code]; ok {
+			return StreamError{
+				Code: code,
+				Desc: se.Error(),
+			}
+		}
+	}
+	return ConnectionError{Desc: err.Error()}
+}
diff --git a/vendor/src/google.golang.org/grpc/transport/http2_client.go b/vendor/src/google.golang.org/grpc/transport/http2_client.go
index 07b0c1171..8082fdc8e 100644
--- a/vendor/src/google.golang.org/grpc/transport/http2_client.go
+++ b/vendor/src/google.golang.org/grpc/transport/http2_client.go
@@ -50,6 +50,7 @@ import (
 	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/grpclog"
 	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/peer"
 )
 
 // http2Client implements the ClientTransport interface with HTTP2.
@@ -139,29 +140,6 @@ func newHTTP2Client(addr string, opts *ConnectOptions) (_ ClientTransport, err e
 			conn.Close()
 		}
 	}()
-	// Send connection preface to server.
-	n, err := conn.Write(clientPreface)
-	if err != nil {
-		return nil, ConnectionErrorf("transport: %v", err)
-	}
-	if n != len(clientPreface) {
-		return nil, ConnectionErrorf("transport: preface mismatch, wrote %d bytes; want %d", n, len(clientPreface))
-	}
-	framer := newFramer(conn)
-	if initialWindowSize != defaultWindowSize {
-		err = framer.writeSettings(true, http2.Setting{http2.SettingInitialWindowSize, uint32(initialWindowSize)})
-	} else {
-		err = framer.writeSettings(true)
-	}
-	if err != nil {
-		return nil, ConnectionErrorf("transport: %v", err)
-	}
-	// Adjust the connection flow control window if needed.
-	if delta := uint32(initialConnWindowSize - defaultWindowSize); delta > 0 {
-		if err := framer.writeWindowUpdate(true, 0, delta); err != nil {
-			return nil, ConnectionErrorf("transport: %v", err)
-		}
-	}
 	ua := primaryUA
 	if opts.UserAgent != "" {
 		ua = opts.UserAgent + " " + ua
@@ -177,7 +155,7 @@ func newHTTP2Client(addr string, opts *ConnectOptions) (_ ClientTransport, err e
 		writableChan:    make(chan int, 1),
 		shutdownChan:    make(chan struct{}),
 		errorChan:       make(chan struct{}),
-		framer:          framer,
+		framer:          newFramer(conn),
 		hBuf:            &buf,
 		hEnc:            hpack.NewEncoder(&buf),
 		controlBuf:      newRecvBuffer(),
@@ -190,27 +168,49 @@ func newHTTP2Client(addr string, opts *ConnectOptions) (_ ClientTransport, err e
 		maxStreams:      math.MaxInt32,
 		streamSendQuota: defaultWindowSize,
 	}
+	// Start the reader goroutine for incoming message. Each transport has
+	// a dedicated goroutine which reads HTTP2 frame from network. Then it
+	// dispatches the frame to the corresponding stream entity.
+	go t.reader()
+	// Send connection preface to server.
+	n, err := t.conn.Write(clientPreface)
+	if err != nil {
+		t.Close()
+		return nil, ConnectionErrorf("transport: %v", err)
+	}
+	if n != len(clientPreface) {
+		t.Close()
+		return nil, ConnectionErrorf("transport: preface mismatch, wrote %d bytes; want %d", n, len(clientPreface))
+	}
+	if initialWindowSize != defaultWindowSize {
+		err = t.framer.writeSettings(true, http2.Setting{http2.SettingInitialWindowSize, uint32(initialWindowSize)})
+	} else {
+		err = t.framer.writeSettings(true)
+	}
+	if err != nil {
+		t.Close()
+		return nil, ConnectionErrorf("transport: %v", err)
+	}
+	// Adjust the connection flow control window if needed.
+	if delta := uint32(initialConnWindowSize - defaultWindowSize); delta > 0 {
+		if err := t.framer.writeWindowUpdate(true, 0, delta); err != nil {
+			t.Close()
+			return nil, ConnectionErrorf("transport: %v", err)
+		}
+	}
 	go t.controller()
 	t.writableChan <- 0
-	// Start the reader goroutine for incoming message. The threading model
-	// on receiving is that each transport has a dedicated goroutine which
-	// reads HTTP2 frame from network. Then it dispatches the frame to the
-	// corresponding stream entity.
-	go t.reader()
 	return t, nil
 }
 
 func (t *http2Client) newStream(ctx context.Context, callHdr *CallHdr) *Stream {
-	fc := &inFlow{
-		limit: initialWindowSize,
-		conn:  t.fc,
-	}
 	// TODO(zhaoq): Handle uint32 overflow of Stream.id.
 	s := &Stream{
 		id:            t.nextID,
 		method:        callHdr.Method,
+		sendCompress:  callHdr.SendCompress,
 		buf:           newRecvBuffer(),
-		fc:            fc,
+		fc:            &inFlow{limit: initialWindowSize},
 		sendQuotaPool: newQuotaPool(int(t.streamSendQuota)),
 		headerChan:    make(chan struct{}),
 	}
@@ -234,14 +234,20 @@ func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (_ *Strea
 	var timeout time.Duration
 	if dl, ok := ctx.Deadline(); ok {
 		timeout = dl.Sub(time.Now())
-		if timeout <= 0 {
-			return nil, ContextErr(context.DeadlineExceeded)
-		}
+	}
+	select {
+	case <-ctx.Done():
+		return nil, ContextErr(ctx.Err())
+	default:
+	}
+	pr := &peer.Peer{
+		Addr: t.conn.RemoteAddr(),
 	}
 	// Attach Auth info if there is any.
 	if t.authInfo != nil {
-		ctx = credentials.NewContext(ctx, t.authInfo)
+		pr.AuthInfo = t.authInfo
 	}
+	ctx = peer.NewContext(ctx, pr)
 	authData := make(map[string]string)
 	for _, c := range t.authCreds {
 		// Construct URI required to get auth request metadata.
@@ -317,10 +323,15 @@ func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (_ *Strea
 	t.hEnc.WriteField(hpack.HeaderField{Name: "user-agent", Value: t.userAgent})
 	t.hEnc.WriteField(hpack.HeaderField{Name: "te", Value: "trailers"})
 
+	if callHdr.SendCompress != "" {
+		t.hEnc.WriteField(hpack.HeaderField{Name: "grpc-encoding", Value: callHdr.SendCompress})
+	}
 	if timeout > 0 {
 		t.hEnc.WriteField(hpack.HeaderField{Name: "grpc-timeout", Value: timeoutEncode(timeout)})
 	}
 	for k, v := range authData {
+		// Capital header names are illegal in HTTP/2.
+		k = strings.ToLower(k)
 		t.hEnc.WriteField(hpack.HeaderField{Name: k, Value: v})
 	}
 	var (
@@ -344,6 +355,10 @@ func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (_ *Strea
 		} else {
 			endHeaders = true
 		}
+		var flush bool
+		if endHeaders && (hasMD || callHdr.Flush) {
+			flush = true
+		}
 		if first {
 			// Sends a HeadersFrame to server to start a new stream.
 			p := http2.HeadersFrameParam{
@@ -355,11 +370,11 @@ func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (_ *Strea
 			// Do a force flush for the buffered frames iff it is the last headers frame
 			// and there is header metadata to be sent. Otherwise, there is flushing until
 			// the corresponding data frame is written.
-			err = t.framer.writeHeaders(hasMD && endHeaders, p)
+			err = t.framer.writeHeaders(flush, p)
 			first = false
 		} else {
 			// Sends Continuation frames for the leftover headers.
-			err = t.framer.writeContinuation(hasMD && endHeaders, s.id, endHeaders, t.hBuf.Next(size))
+			err = t.framer.writeContinuation(flush, s.id, endHeaders, t.hBuf.Next(size))
 		}
 		if err != nil {
 			t.notifyError(err)
@@ -389,8 +404,10 @@ func (t *http2Client) CloseStream(s *Stream, err error) {
 	// other goroutines.
 	s.cancel()
 	s.mu.Lock()
-	if q := s.fc.restoreConn(); q > 0 {
-		t.controlBuf.put(&windowUpdate{0, q})
+	if q := s.fc.resetPendingData(); q > 0 {
+		if n := t.fc.onRead(q); n > 0 {
+			t.controlBuf.put(&windowUpdate{0, n})
+		}
 	}
 	if s.state == streamDone {
 		s.mu.Unlock()
@@ -412,6 +429,9 @@ func (t *http2Client) CloseStream(s *Stream, err error) {
 // accessed any more.
 func (t *http2Client) Close() (err error) {
 	t.mu.Lock()
+	if t.state == reachable {
+		close(t.errorChan)
+	}
 	if t.state == closing {
 		t.mu.Unlock()
 		return errors.New("transport: Close() was already called")
@@ -490,6 +510,10 @@ func (t *http2Client) Write(s *Stream, data []byte, opts *Options) error {
 		t.framer.adjustNumWriters(1)
 		// Got some quota. Try to acquire writing privilege on the transport.
 		if _, err := wait(s.ctx, t.shutdownChan, t.writableChan); err != nil {
+			if _, ok := err.(StreamError); ok {
+				// Return the connection quota back.
+				t.sendQuotaPool.add(len(p))
+			}
 			if t.framer.adjustNumWriters(-1) == 0 {
 				// This writer is the last one in this batch and has the
 				// responsibility to flush the buffered frames. It queues
@@ -499,6 +523,16 @@ func (t *http2Client) Write(s *Stream, data []byte, opts *Options) error {
 			}
 			return err
 		}
+		select {
+		case <-s.ctx.Done():
+			t.sendQuotaPool.add(len(p))
+			if t.framer.adjustNumWriters(-1) == 0 {
+				t.controlBuf.put(&flushIO{})
+			}
+			t.writableChan <- 0
+			return ContextErr(s.ctx.Err())
+		default:
+		}
 		if r.Len() == 0 && t.framer.adjustNumWriters(0) == 1 {
 			// Do a force flush iff this is last frame for the entire gRPC message
 			// and the caller is the only writer at this moment.
@@ -537,47 +571,52 @@ func (t *http2Client) Write(s *Stream, data []byte, opts *Options) error {
 func (t *http2Client) getStream(f http2.Frame) (*Stream, bool) {
 	t.mu.Lock()
 	defer t.mu.Unlock()
-	if t.activeStreams == nil {
-		// The transport is closing.
-		return nil, false
-	}
-	if s, ok := t.activeStreams[f.Header().StreamID]; ok {
-		return s, true
-	}
-	return nil, false
+	s, ok := t.activeStreams[f.Header().StreamID]
+	return s, ok
 }
 
 // updateWindow adjusts the inbound quota for the stream and the transport.
 // Window updates will deliver to the controller for sending when
 // the cumulative quota exceeds the corresponding threshold.
 func (t *http2Client) updateWindow(s *Stream, n uint32) {
-	swu, cwu := s.fc.onRead(n)
-	if swu > 0 {
-		t.controlBuf.put(&windowUpdate{s.id, swu})
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.state == streamDone {
+		return
 	}
-	if cwu > 0 {
-		t.controlBuf.put(&windowUpdate{0, cwu})
+	if w := t.fc.onRead(n); w > 0 {
+		t.controlBuf.put(&windowUpdate{0, w})
+	}
+	if w := s.fc.onRead(n); w > 0 {
+		t.controlBuf.put(&windowUpdate{s.id, w})
 	}
 }
 
 func (t *http2Client) handleData(f *http2.DataFrame) {
+	size := len(f.Data())
+	if err := t.fc.onData(uint32(size)); err != nil {
+		t.notifyError(ConnectionErrorf("%v", err))
+		return
+	}
 	// Select the right stream to dispatch.
 	s, ok := t.getStream(f)
 	if !ok {
+		if w := t.fc.onRead(uint32(size)); w > 0 {
+			t.controlBuf.put(&windowUpdate{0, w})
+		}
 		return
 	}
-	size := len(f.Data())
 	if size > 0 {
+		s.mu.Lock()
+		if s.state == streamDone {
+			s.mu.Unlock()
+			// The stream has been closed. Release the corresponding quota.
+			if w := t.fc.onRead(uint32(size)); w > 0 {
+				t.controlBuf.put(&windowUpdate{0, w})
+			}
+			return
+		}
 		if err := s.fc.onData(uint32(size)); err != nil {
-			if _, ok := err.(ConnectionError); ok {
-				t.notifyError(err)
-				return
-			}
-			s.mu.Lock()
-			if s.state == streamDone {
-				s.mu.Unlock()
-				return
-			}
 			s.state = streamDone
 			s.statusCode = codes.Internal
 			s.statusDesc = err.Error()
@@ -586,6 +625,7 @@ func (t *http2Client) handleData(f *http2.DataFrame) {
 			t.controlBuf.put(&resetStream{s.id, http2.ErrCodeFlowControl})
 			return
 		}
+		s.mu.Unlock()
 		// TODO(bradfitz, zhaoq): A copy is required here because there is no
 		// guarantee f.Data() is consumed before the arrival of next frame.
 		// Can this copy be eliminated?
@@ -624,9 +664,10 @@ func (t *http2Client) handleRSTStream(f *http2.RSTStreamFrame) {
 		close(s.headerChan)
 		s.headerDone = true
 	}
-	s.statusCode, ok = http2RSTErrConvTab[http2.ErrCode(f.ErrCode)]
+	s.statusCode, ok = http2ErrConvTab[http2.ErrCode(f.ErrCode)]
 	if !ok {
 		grpclog.Println("transport: http2Client.handleRSTStream found no mapped gRPC status for the received http2 error ", f.ErrCode)
+		s.statusCode = codes.Unknown
 	}
 	s.mu.Unlock()
 	s.write(recvMsg{err: io.EOF})
@@ -667,52 +708,59 @@ func (t *http2Client) handleWindowUpdate(f *http2.WindowUpdateFrame) {
 	}
 }
 
-// operateHeader takes action on the decoded headers. It returns the current
-// stream if there are remaining headers on the wire (in the following
-// Continuation frame).
-func (t *http2Client) operateHeaders(hDec *hpackDecoder, s *Stream, frame headerFrame, endStream bool) (pendingStream *Stream) {
-	defer func() {
-		if pendingStream == nil {
-			hDec.state = decodeState{}
-		}
-	}()
-	endHeaders, err := hDec.decodeClientHTTP2Headers(frame)
-	if s == nil {
-		// s has been closed.
-		return nil
+// operateHeaders takes action on the decoded headers.
+func (t *http2Client) operateHeaders(frame *http2.MetaHeadersFrame) {
+	s, ok := t.getStream(frame)
+	if !ok {
+		return
 	}
-	if err != nil {
-		s.write(recvMsg{err: err})
+	var state decodeState
+	for _, hf := range frame.Fields {
+		state.processHeaderField(hf)
+	}
+	if state.err != nil {
+		s.write(recvMsg{err: state.err})
 		// Something wrong. Stops reading even when there is remaining.
-		return nil
-	}
-	if !endHeaders {
-		return s
+		return
 	}
 
+	endStream := frame.StreamEnded()
+
 	s.mu.Lock()
+	if !endStream {
+		s.recvCompress = state.encoding
+	}
 	if !s.headerDone {
-		if !endStream && len(hDec.state.mdata) > 0 {
-			s.header = hDec.state.mdata
+		if !endStream && len(state.mdata) > 0 {
+			s.header = state.mdata
 		}
 		close(s.headerChan)
 		s.headerDone = true
 	}
 	if !endStream || s.state == streamDone {
 		s.mu.Unlock()
-		return nil
+		return
 	}
 
-	if len(hDec.state.mdata) > 0 {
-		s.trailer = hDec.state.mdata
+	if len(state.mdata) > 0 {
+		s.trailer = state.mdata
 	}
 	s.state = streamDone
-	s.statusCode = hDec.state.statusCode
-	s.statusDesc = hDec.state.statusDesc
+	s.statusCode = state.statusCode
+	s.statusDesc = state.statusDesc
 	s.mu.Unlock()
 
 	s.write(recvMsg{err: io.EOF})
-	return nil
+}
+
+func handleMalformedHTTP2(s *Stream, err error) {
+	s.mu.Lock()
+	if !s.headerDone {
+		close(s.headerChan)
+		s.headerDone = true
+	}
+	s.mu.Unlock()
+	s.write(recvMsg{err: err})
 }
 
 // reader runs as a separate goroutine in charge of reading data from network
@@ -735,25 +783,31 @@ func (t *http2Client) reader() {
 	}
 	t.handleSettings(sf)
 
-	hDec := newHPACKDecoder()
-	var curStream *Stream
 	// loop to keep reading incoming messages on this transport.
 	for {
 		frame, err := t.framer.readFrame()
 		if err != nil {
-			t.notifyError(err)
-			return
+			// Abort an active stream if the http2.Framer returns a
+			// http2.StreamError. This can happen only if the server's response
+			// is malformed http2.
+			if se, ok := err.(http2.StreamError); ok {
+				t.mu.Lock()
+				s := t.activeStreams[se.StreamID]
+				t.mu.Unlock()
+				if s != nil {
+					// use error detail to provide better err message
+					handleMalformedHTTP2(s, StreamErrorf(http2ErrConvTab[se.Code], "%v", t.framer.errorDetail()))
+				}
+				continue
+			} else {
+				// Transport error.
+				t.notifyError(err)
+				return
+			}
 		}
 		switch frame := frame.(type) {
-		case *http2.HeadersFrame:
-			// operateHeaders has to be invoked regardless the value of curStream
-			// because the HPACK decoder needs to be updated using the received
-			// headers.
-			curStream, _ = t.getStream(frame)
-			endStream := frame.Header().Flags.Has(http2.FlagHeadersEndStream)
-			curStream = t.operateHeaders(hDec, curStream, frame, endStream)
-		case *http2.ContinuationFrame:
-			curStream = t.operateHeaders(hDec, curStream, frame, frame.HeadersEnded())
+		case *http2.MetaHeadersFrame:
+			t.operateHeaders(frame)
 		case *http2.DataFrame:
 			t.handleData(frame)
 		case *http2.RSTStreamFrame:
diff --git a/vendor/src/google.golang.org/grpc/transport/http2_server.go b/vendor/src/google.golang.org/grpc/transport/http2_server.go
index e16c63cc9..21b631168 100644
--- a/vendor/src/google.golang.org/grpc/transport/http2_server.go
+++ b/vendor/src/google.golang.org/grpc/transport/http2_server.go
@@ -49,6 +49,7 @@ import (
 	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/grpclog"
 	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/peer"
 )
 
 // ErrIllegalHeaderWrite indicates that setting header is illegal because of
@@ -61,8 +62,8 @@ type http2Server struct {
 	maxStreamID uint32               // max stream ID ever seen
 	authInfo    credentials.AuthInfo // auth info about the connection
 	// writableChan synchronizes write access to the transport.
-	// A writer acquires the write lock by sending a value on writableChan
-	// and releases it by receiving from writableChan.
+	// A writer acquires the write lock by receiving a value on writableChan
+	// and releases it by sending on writableChan.
 	writableChan chan int
 	// shutdownChan is closed when Close is called.
 	// Blocking operations should select on shutdownChan to avoid
@@ -135,66 +136,69 @@ func newHTTP2Server(conn net.Conn, maxStreams uint32, authInfo credentials.AuthI
 	return t, nil
 }
 
-// operateHeader takes action on the decoded headers. It returns the current
-// stream if there are remaining headers on the wire (in the following
-// Continuation frame).
-func (t *http2Server) operateHeaders(hDec *hpackDecoder, s *Stream, frame headerFrame, endStream bool, handle func(*Stream)) (pendingStream *Stream) {
-	defer func() {
-		if pendingStream == nil {
-			hDec.state = decodeState{}
-		}
-	}()
-	endHeaders, err := hDec.decodeServerHTTP2Headers(frame)
-	if s == nil {
-		// s has been closed.
-		return nil
+// operateHeader takes action on the decoded headers.
+func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(*Stream)) {
+	buf := newRecvBuffer()
+	s := &Stream{
+		id:  frame.Header().StreamID,
+		st:  t,
+		buf: buf,
+		fc:  &inFlow{limit: initialWindowSize},
 	}
-	if err != nil {
-		grpclog.Printf("transport: http2Server.operateHeader found %v", err)
+
+	var state decodeState
+	for _, hf := range frame.Fields {
+		state.processHeaderField(hf)
+	}
+	if err := state.err; err != nil {
 		if se, ok := err.(StreamError); ok {
 			t.controlBuf.put(&resetStream{s.id, statusCodeConvTab[se.Code]})
 		}
-		return nil
+		return
 	}
-	if endStream {
+
+	if frame.StreamEnded() {
 		// s is just created by the caller. No lock needed.
 		s.state = streamReadDone
 	}
-	if !endHeaders {
-		return s
-	}
-	if hDec.state.timeoutSet {
-		s.ctx, s.cancel = context.WithTimeout(context.TODO(), hDec.state.timeout)
+	s.recvCompress = state.encoding
+	if state.timeoutSet {
+		s.ctx, s.cancel = context.WithTimeout(context.TODO(), state.timeout)
 	} else {
 		s.ctx, s.cancel = context.WithCancel(context.TODO())
 	}
+	pr := &peer.Peer{
+		Addr: t.conn.RemoteAddr(),
+	}
 	// Attach Auth info if there is any.
 	if t.authInfo != nil {
-		s.ctx = credentials.NewContext(s.ctx, t.authInfo)
+		pr.AuthInfo = t.authInfo
 	}
+	s.ctx = peer.NewContext(s.ctx, pr)
 	// Cache the current stream to the context so that the server application
 	// can find out. Required when the server wants to send some metadata
 	// back to the client (unary call only).
 	s.ctx = newContextWithStream(s.ctx, s)
 	// Attach the received metadata to the context.
-	if len(hDec.state.mdata) > 0 {
-		s.ctx = metadata.NewContext(s.ctx, hDec.state.mdata)
+	if len(state.mdata) > 0 {
+		s.ctx = metadata.NewContext(s.ctx, state.mdata)
 	}
 
 	s.dec = &recvBufferReader{
 		ctx:  s.ctx,
 		recv: s.buf,
 	}
-	s.method = hDec.state.method
+	s.recvCompress = state.encoding
+	s.method = state.method
 	t.mu.Lock()
 	if t.state != reachable {
 		t.mu.Unlock()
-		return nil
+		return
 	}
 	if uint32(len(t.activeStreams)) >= t.maxStreams {
 		t.mu.Unlock()
 		t.controlBuf.put(&resetStream{s.id, http2.ErrCodeRefusedStream})
-		return nil
+		return
 	}
 	s.sendQuotaPool = newQuotaPool(int(t.streamSendQuota))
 	t.activeStreams[s.id] = s
@@ -203,7 +207,6 @@ func (t *http2Server) operateHeaders(hDec *hpackDecoder, s *Stream, frame header
 		t.updateWindow(s, uint32(n))
 	}
 	handle(s)
-	return nil
 }
 
 // HandleStreams receives incoming streams using the given handler. This is
@@ -236,16 +239,24 @@ func (t *http2Server) HandleStreams(handle func(*Stream)) {
 	}
 	t.handleSettings(sf)
 
-	hDec := newHPACKDecoder()
-	var curStream *Stream
 	for {
 		frame, err := t.framer.readFrame()
 		if err != nil {
+			if se, ok := err.(http2.StreamError); ok {
+				t.mu.Lock()
+				s := t.activeStreams[se.StreamID]
+				t.mu.Unlock()
+				if s != nil {
+					t.closeStream(s)
+				}
+				t.controlBuf.put(&resetStream{se.StreamID, se.Code})
+				continue
+			}
 			t.Close()
 			return
 		}
 		switch frame := frame.(type) {
-		case *http2.HeadersFrame:
+		case *http2.MetaHeadersFrame:
 			id := frame.Header().StreamID
 			if id%2 != 1 || id <= t.maxStreamID {
 				// illegal gRPC stream id.
@@ -254,21 +265,7 @@ func (t *http2Server) HandleStreams(handle func(*Stream)) {
 				break
 			}
 			t.maxStreamID = id
-			buf := newRecvBuffer()
-			fc := &inFlow{
-				limit: initialWindowSize,
-				conn:  t.fc,
-			}
-			curStream = &Stream{
-				id:  frame.Header().StreamID,
-				st:  t,
-				buf: buf,
-				fc:  fc,
-			}
-			endStream := frame.Header().Flags.Has(http2.FlagHeadersEndStream)
-			curStream = t.operateHeaders(hDec, curStream, frame, endStream, handle)
-		case *http2.ContinuationFrame:
-			curStream = t.operateHeaders(hDec, curStream, frame, frame.HeadersEnded(), handle)
+			t.operateHeaders(frame, handle)
 		case *http2.DataFrame:
 			t.handleData(frame)
 		case *http2.RSTStreamFrame:
@@ -306,33 +303,51 @@ func (t *http2Server) getStream(f http2.Frame) (*Stream, bool) {
 // Window updates will deliver to the controller for sending when
 // the cumulative quota exceeds the corresponding threshold.
 func (t *http2Server) updateWindow(s *Stream, n uint32) {
-	swu, cwu := s.fc.onRead(n)
-	if swu > 0 {
-		t.controlBuf.put(&windowUpdate{s.id, swu})
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.state == streamDone {
+		return
 	}
-	if cwu > 0 {
-		t.controlBuf.put(&windowUpdate{0, cwu})
+	if w := t.fc.onRead(n); w > 0 {
+		t.controlBuf.put(&windowUpdate{0, w})
+	}
+	if w := s.fc.onRead(n); w > 0 {
+		t.controlBuf.put(&windowUpdate{s.id, w})
 	}
 }
 
 func (t *http2Server) handleData(f *http2.DataFrame) {
+	size := len(f.Data())
+	if err := t.fc.onData(uint32(size)); err != nil {
+		grpclog.Printf("transport: http2Server %v", err)
+		t.Close()
+		return
+	}
 	// Select the right stream to dispatch.
 	s, ok := t.getStream(f)
 	if !ok {
+		if w := t.fc.onRead(uint32(size)); w > 0 {
+			t.controlBuf.put(&windowUpdate{0, w})
+		}
 		return
 	}
-	size := len(f.Data())
 	if size > 0 {
-		if err := s.fc.onData(uint32(size)); err != nil {
-			if _, ok := err.(ConnectionError); ok {
-				grpclog.Printf("transport: http2Server %v", err)
-				t.Close()
-				return
+		s.mu.Lock()
+		if s.state == streamDone {
+			s.mu.Unlock()
+			// The stream has been closed. Release the corresponding quota.
+			if w := t.fc.onRead(uint32(size)); w > 0 {
+				t.controlBuf.put(&windowUpdate{0, w})
 			}
+			return
+		}
+		if err := s.fc.onData(uint32(size)); err != nil {
+			s.mu.Unlock()
 			t.closeStream(s)
 			t.controlBuf.put(&resetStream{s.id, http2.ErrCodeFlowControl})
 			return
 		}
+		s.mu.Unlock()
 		// TODO(bradfitz, zhaoq): A copy is required here because there is no
 		// guarantee f.Data() is consumed before the arrival of next frame.
 		// Can this copy be eliminated?
@@ -441,6 +456,9 @@ func (t *http2Server) WriteHeader(s *Stream, md metadata.MD) error {
 	t.hBuf.Reset()
 	t.hEnc.WriteField(hpack.HeaderField{Name: ":status", Value: "200"})
 	t.hEnc.WriteField(hpack.HeaderField{Name: "content-type", Value: "application/grpc"})
+	if s.sendCompress != "" {
+		t.hEnc.WriteField(hpack.HeaderField{Name: "grpc-encoding", Value: s.sendCompress})
+	}
 	for k, v := range md {
 		for _, entry := range v {
 			t.hEnc.WriteField(hpack.HeaderField{Name: k, Value: entry})
@@ -503,6 +521,10 @@ func (t *http2Server) Write(s *Stream, data []byte, opts *Options) error {
 	// TODO(zhaoq): Support multi-writers for a single stream.
 	var writeHeaderFrame bool
 	s.mu.Lock()
+	if s.state == streamDone {
+		s.mu.Unlock()
+		return StreamErrorf(codes.Unknown, "the stream has been done")
+	}
 	if !s.headerOk {
 		writeHeaderFrame = true
 		s.headerOk = true
@@ -515,6 +537,9 @@ func (t *http2Server) Write(s *Stream, data []byte, opts *Options) error {
 		t.hBuf.Reset()
 		t.hEnc.WriteField(hpack.HeaderField{Name: ":status", Value: "200"})
 		t.hEnc.WriteField(hpack.HeaderField{Name: "content-type", Value: "application/grpc"})
+		if s.sendCompress != "" {
+			t.hEnc.WriteField(hpack.HeaderField{Name: "grpc-encoding", Value: s.sendCompress})
+		}
 		p := http2.HeadersFrameParam{
 			StreamID:      s.id,
 			BlockFragment: t.hBuf.Bytes(),
@@ -567,6 +592,10 @@ func (t *http2Server) Write(s *Stream, data []byte, opts *Options) error {
 		// Got some quota. Try to acquire writing privilege on the
 		// transport.
 		if _, err := wait(s.ctx, t.shutdownChan, t.writableChan); err != nil {
+			if _, ok := err.(StreamError); ok {
+				// Return the connection quota back.
+				t.sendQuotaPool.add(ps)
+			}
 			if t.framer.adjustNumWriters(-1) == 0 {
 				// This writer is the last one in this batch and has the
 				// responsibility to flush the buffered frames. It queues
@@ -576,6 +605,16 @@ func (t *http2Server) Write(s *Stream, data []byte, opts *Options) error {
 			}
 			return err
 		}
+		select {
+		case <-s.ctx.Done():
+			t.sendQuotaPool.add(ps)
+			if t.framer.adjustNumWriters(-1) == 0 {
+				t.controlBuf.put(&flushIO{})
+			}
+			t.writableChan <- 0
+			return ContextErr(s.ctx.Err())
+		default:
+		}
 		var forceFlush bool
 		if r.Len() == 0 && t.framer.adjustNumWriters(0) == 1 && !opts.Last {
 			forceFlush = true
@@ -673,20 +712,22 @@ func (t *http2Server) closeStream(s *Stream) {
 	t.mu.Lock()
 	delete(t.activeStreams, s.id)
 	t.mu.Unlock()
-	if q := s.fc.restoreConn(); q > 0 {
-		t.controlBuf.put(&windowUpdate{0, q})
-	}
+	// In case stream sending and receiving are invoked in separate
+	// goroutines (e.g., bi-directional streaming), cancel needs to be
+	// called to interrupt the potential blocking on other goroutines.
+	s.cancel()
 	s.mu.Lock()
+	if q := s.fc.resetPendingData(); q > 0 {
+		if w := t.fc.onRead(q); w > 0 {
+			t.controlBuf.put(&windowUpdate{0, w})
+		}
+	}
 	if s.state == streamDone {
 		s.mu.Unlock()
 		return
 	}
 	s.state = streamDone
 	s.mu.Unlock()
-	// In case stream sending and receiving are invoked in separate
-	// goroutines (e.g., bi-directional streaming), cancel needs to be
-	// called to interrupt the potential blocking on other goroutines.
-	s.cancel()
 }
 
 func (t *http2Server) RemoteAddr() net.Addr {
diff --git a/vendor/src/google.golang.org/grpc/transport/http_util.go b/vendor/src/google.golang.org/grpc/transport/http_util.go
index fec4e4755..7a3594ace 100644
--- a/vendor/src/google.golang.org/grpc/transport/http_util.go
+++ b/vendor/src/google.golang.org/grpc/transport/http_util.go
@@ -62,13 +62,14 @@ const (
 )
 
 var (
-	clientPreface      = []byte(http2.ClientPreface)
-	http2RSTErrConvTab = map[http2.ErrCode]codes.Code{
+	clientPreface   = []byte(http2.ClientPreface)
+	http2ErrConvTab = map[http2.ErrCode]codes.Code{
 		http2.ErrCodeNo:                 codes.Internal,
 		http2.ErrCodeProtocol:           codes.Internal,
 		http2.ErrCodeInternal:           codes.Internal,
 		http2.ErrCodeFlowControl:        codes.ResourceExhausted,
 		http2.ErrCodeSettingsTimeout:    codes.Internal,
+		http2.ErrCodeStreamClosed:       codes.Internal,
 		http2.ErrCodeFrameSize:          codes.Internal,
 		http2.ErrCodeRefusedStream:      codes.Unavailable,
 		http2.ErrCodeCancel:             codes.Canceled,
@@ -76,6 +77,7 @@ var (
 		http2.ErrCodeConnect:            codes.Internal,
 		http2.ErrCodeEnhanceYourCalm:    codes.ResourceExhausted,
 		http2.ErrCodeInadequateSecurity: codes.PermissionDenied,
+		http2.ErrCodeHTTP11Required:     codes.FailedPrecondition,
 	}
 	statusCodeConvTab = map[codes.Code]http2.ErrCode{
 		codes.Internal:          http2.ErrCodeInternal,
@@ -89,6 +91,9 @@ var (
 // Records the states during HPACK decoding. Must be reset once the
 // decoding of the entire headers are finished.
 type decodeState struct {
+	err error // first error encountered decoding
+
+	encoding string
 	// statusCode caches the stream status received from the trailer
 	// the server sent. Client side only.
 	statusCode codes.Code
@@ -101,25 +106,11 @@ type decodeState struct {
 	mdata map[string][]string
 }
 
-// An hpackDecoder decodes HTTP2 headers which may span multiple frames.
-type hpackDecoder struct {
-	h     *hpack.Decoder
-	state decodeState
-	err   error // The err when decoding
-}
-
-// A headerFrame is either a http2.HeaderFrame or http2.ContinuationFrame.
-type headerFrame interface {
-	Header() http2.FrameHeader
-	HeaderBlockFragment() []byte
-	HeadersEnded() bool
-}
-
 // isReservedHeader checks whether hdr belongs to HTTP2 headers
 // reserved by gRPC protocol. Any other headers are classified as the
 // user-specified metadata.
 func isReservedHeader(hdr string) bool {
-	if hdr[0] == ':' {
+	if hdr != "" && hdr[0] == ':' {
 		return true
 	}
 	switch hdr {
@@ -136,98 +127,62 @@ func isReservedHeader(hdr string) bool {
 	}
 }
 
-func newHPACKDecoder() *hpackDecoder {
-	d := &hpackDecoder{}
-	d.h = hpack.NewDecoder(http2InitHeaderTableSize, func(f hpack.HeaderField) {
-		switch f.Name {
-		case "content-type":
-			if !strings.Contains(f.Value, "application/grpc") {
-				d.err = StreamErrorf(codes.FailedPrecondition, "transport: received the unexpected header")
-				return
-			}
-		case "grpc-status":
-			code, err := strconv.Atoi(f.Value)
-			if err != nil {
-				d.err = StreamErrorf(codes.Internal, "transport: malformed grpc-status: %v", err)
-				return
-			}
-			d.state.statusCode = codes.Code(code)
-		case "grpc-message":
-			d.state.statusDesc = f.Value
-		case "grpc-timeout":
-			d.state.timeoutSet = true
-			var err error
-			d.state.timeout, err = timeoutDecode(f.Value)
-			if err != nil {
-				d.err = StreamErrorf(codes.Internal, "transport: malformed time-out: %v", err)
-				return
-			}
-		case ":path":
-			d.state.method = f.Value
-		default:
-			if !isReservedHeader(f.Name) {
-				if f.Name == "user-agent" {
-					i := strings.LastIndex(f.Value, " ")
-					if i == -1 {
-						// There is no application user agent string being set.
-						return
-					}
-					// Extract the application user agent string.
-					f.Value = f.Value[:i]
-				}
-				if d.state.mdata == nil {
-					d.state.mdata = make(map[string][]string)
-				}
-				k, v, err := metadata.DecodeKeyValue(f.Name, f.Value)
-				if err != nil {
-					grpclog.Printf("Failed to decode (%q, %q): %v", f.Name, f.Value, err)
+func (d *decodeState) setErr(err error) {
+	if d.err == nil {
+		d.err = err
+	}
+}
+
+func (d *decodeState) processHeaderField(f hpack.HeaderField) {
+	switch f.Name {
+	case "content-type":
+		if !strings.Contains(f.Value, "application/grpc") {
+			d.setErr(StreamErrorf(codes.FailedPrecondition, "transport: received the unexpected content-type %q", f.Value))
+			return
+		}
+	case "grpc-encoding":
+		d.encoding = f.Value
+	case "grpc-status":
+		code, err := strconv.Atoi(f.Value)
+		if err != nil {
+			d.setErr(StreamErrorf(codes.Internal, "transport: malformed grpc-status: %v", err))
+			return
+		}
+		d.statusCode = codes.Code(code)
+	case "grpc-message":
+		d.statusDesc = f.Value
+	case "grpc-timeout":
+		d.timeoutSet = true
+		var err error
+		d.timeout, err = timeoutDecode(f.Value)
+		if err != nil {
+			d.setErr(StreamErrorf(codes.Internal, "transport: malformed time-out: %v", err))
+			return
+		}
+	case ":path":
+		d.method = f.Value
+	default:
+		if !isReservedHeader(f.Name) {
+			if f.Name == "user-agent" {
+				i := strings.LastIndex(f.Value, " ")
+				if i == -1 {
+					// There is no application user agent string being set.
 					return
 				}
-				d.state.mdata[k] = append(d.state.mdata[k], v)
+				// Extract the application user agent string.
+				f.Value = f.Value[:i]
 			}
+			if d.mdata == nil {
+				d.mdata = make(map[string][]string)
+			}
+			k, v, err := metadata.DecodeKeyValue(f.Name, f.Value)
+			if err != nil {
+				grpclog.Printf("Failed to decode (%q, %q): %v", f.Name, f.Value, err)
+				return
+			}
+			d.mdata[k] = append(d.mdata[k], v)
 		}
-	})
-	return d
-}
-
-func (d *hpackDecoder) decodeClientHTTP2Headers(frame headerFrame) (endHeaders bool, err error) {
-	d.err = nil
-	_, err = d.h.Write(frame.HeaderBlockFragment())
-	if err != nil {
-		err = StreamErrorf(codes.Internal, "transport: HPACK header decode error: %v", err)
 	}
-
-	if frame.HeadersEnded() {
-		if closeErr := d.h.Close(); closeErr != nil && err == nil {
-			err = StreamErrorf(codes.Internal, "transport: HPACK decoder close error: %v", closeErr)
-		}
-		endHeaders = true
-	}
-
-	if err == nil && d.err != nil {
-		err = d.err
-	}
-	return
-}
-
-func (d *hpackDecoder) decodeServerHTTP2Headers(frame headerFrame) (endHeaders bool, err error) {
-	d.err = nil
-	_, err = d.h.Write(frame.HeaderBlockFragment())
-	if err != nil {
-		err = StreamErrorf(codes.Internal, "transport: HPACK header decode error: %v", err)
-	}
-
-	if frame.HeadersEnded() {
-		if closeErr := d.h.Close(); closeErr != nil && err == nil {
-			err = StreamErrorf(codes.Internal, "transport: HPACK decoder close error: %v", closeErr)
-		}
-		endHeaders = true
-	}
-
-	if err == nil && d.err != nil {
-		err = d.err
-	}
-	return
 }
 
 type timeoutUnit uint8
@@ -318,10 +273,11 @@ type framer struct {
 
 func newFramer(conn net.Conn) *framer {
 	f := &framer{
-		reader: conn,
+		reader: bufio.NewReaderSize(conn, http2IOBufSize),
 		writer: bufio.NewWriterSize(conn, http2IOBufSize),
 	}
 	f.fr = http2.NewFramer(f.writer, f.reader)
+	f.fr.ReadMetaHeaders = hpack.NewDecoder(http2InitHeaderTableSize, nil)
 	return f
 }
 
@@ -449,3 +405,7 @@ func (f *framer) flushWrite() error {
 func (f *framer) readFrame() (http2.Frame, error) {
 	return f.fr.ReadFrame()
 }
+
+func (f *framer) errorDetail() error {
+	return f.fr.ErrorDetail()
+}
diff --git a/vendor/src/google.golang.org/grpc/transport/transport.go b/vendor/src/google.golang.org/grpc/transport/transport.go
index e1e7f5761..87fdf532c 100644
--- a/vendor/src/google.golang.org/grpc/transport/transport.go
+++ b/vendor/src/google.golang.org/grpc/transport/transport.go
@@ -63,13 +63,11 @@ type recvMsg struct {
 	err error
 }
 
-func (recvMsg) isItem() bool {
-	return true
-}
+func (*recvMsg) item() {}
 
 // All items in an out of a recvBuffer should be the same type.
 type item interface {
-	isItem() bool
+	item()
 }
 
 // recvBuffer is an unbounded channel of item.
@@ -89,12 +87,14 @@ func newRecvBuffer() *recvBuffer {
 func (b *recvBuffer) put(r item) {
 	b.mu.Lock()
 	defer b.mu.Unlock()
-	b.backlog = append(b.backlog, r)
-	select {
-	case b.c <- b.backlog[0]:
-		b.backlog = b.backlog[1:]
-	default:
+	if len(b.backlog) == 0 {
+		select {
+		case b.c <- r:
+			return
+		default:
+		}
 	}
+	b.backlog = append(b.backlog, r)
 }
 
 func (b *recvBuffer) load() {
@@ -170,11 +170,13 @@ type Stream struct {
 	ctx    context.Context
 	cancel context.CancelFunc
 	// method records the associated RPC method of the stream.
-	method    string
-	buf       *recvBuffer
-	dec       io.Reader
-	fc        *inFlow
-	recvQuota uint32
+	method       string
+	recvCompress string
+	sendCompress string
+	buf          *recvBuffer
+	dec          io.Reader
+	fc           *inFlow
+	recvQuota    uint32
 	// The accumulated inbound quota pending for window update.
 	updateQuota uint32
 	// The handler to control the window update procedure for both this
@@ -201,6 +203,17 @@ type Stream struct {
 	statusDesc string
 }
 
+// RecvCompress returns the compression algorithm applied to the inbound
+// message. It is empty string if there is no compression applied.
+func (s *Stream) RecvCompress() string {
+	return s.recvCompress
+}
+
+// SetSendCompress sets the compression algorithm to the stream.
+func (s *Stream) SetSendCompress(str string) {
+	s.sendCompress = str
+}
+
 // Header acquires the key-value pairs of header metadata once it
 // is available. It blocks until i) the metadata is ready or ii) there is no
 // header metadata or iii) the stream is cancelled/expired.
@@ -286,20 +299,18 @@ func (s *Stream) Read(p []byte) (n int, err error) {
 	return
 }
 
-type key int
-
 // The key to save transport.Stream in the context.
-const streamKey = key(0)
+type streamKey struct{}
 
 // newContextWithStream creates a new context from ctx and attaches stream
 // to it.
 func newContextWithStream(ctx context.Context, stream *Stream) context.Context {
-	return context.WithValue(ctx, streamKey, stream)
+	return context.WithValue(ctx, streamKey{}, stream)
 }
 
 // StreamFromContext returns the stream saved in ctx.
 func StreamFromContext(ctx context.Context) (s *Stream, ok bool) {
-	s, ok = ctx.Value(streamKey).(*Stream)
+	s, ok = ctx.Value(streamKey{}).(*Stream)
 	return
 }
 
@@ -339,20 +350,40 @@ func NewClientTransport(target string, opts *ConnectOptions) (ClientTransport, e
 // Options provides additional hints and information for message
 // transmission.
 type Options struct {
-	// Indicate whether it is the last piece for this stream.
+	// Last indicates whether this write is the last piece for
+	// this stream.
 	Last bool
-	// The hint to transport impl whether the data could be buffered for
-	// batching write. Transport impl can feel free to ignore it.
+
+	// Delay is a hint to the transport implementation for whether
+	// the data could be buffered for a batching write. The
+	// Transport implementation may ignore the hint.
 	Delay bool
 }
 
 // CallHdr carries the information of a particular RPC.
 type CallHdr struct {
-	Host   string // peer host
-	Method string // the operation to perform on the specified host
+	// Host specifies the peer's host.
+	Host string
+
+	// Method specifies the operation to perform.
+	Method string
+
+	// RecvCompress specifies the compression algorithm applied on
+	// inbound messages.
+	RecvCompress string
+
+	// SendCompress specifies the compression algorithm applied on
+	// outbound message.
+	SendCompress string
+
+	// Flush indicates whether a new stream command should be sent
+	// to the peer without waiting for the first data. This is
+	// only a hint. The transport may modify the flush decision
+	// for performance purposes.
+	Flush bool
 }
 
-// ClientTransport is the common interface for all gRPC client side transport
+// ClientTransport is the common interface for all gRPC client-side transport
 // implementations.
 type ClientTransport interface {
 	// Close tears down this transport. Once it returns, the transport
@@ -381,21 +412,33 @@ type ClientTransport interface {
 	Error() <-chan struct{}
 }
 
-// ServerTransport is the common interface for all gRPC server side transport
+// ServerTransport is the common interface for all gRPC server-side transport
 // implementations.
+//
+// Methods may be called concurrently from multiple goroutines, but
+// Write methods for a given Stream will be called serially.
 type ServerTransport interface {
-	// WriteStatus sends the status of a stream to the client.
-	WriteStatus(s *Stream, statusCode codes.Code, statusDesc string) error
-	// Write sends the data for the given stream.
-	Write(s *Stream, data []byte, opts *Options) error
-	// WriteHeader sends the header metedata for the given stream.
-	WriteHeader(s *Stream, md metadata.MD) error
 	// HandleStreams receives incoming streams using the given handler.
 	HandleStreams(func(*Stream))
+
+	// WriteHeader sends the header metadata for the given stream.
+	// WriteHeader may not be called on all streams.
+	WriteHeader(s *Stream, md metadata.MD) error
+
+	// Write sends the data for the given stream.
+	// Write may not be called on all streams.
+	Write(s *Stream, data []byte, opts *Options) error
+
+	// WriteStatus sends the status of a stream to the client.
+	// WriteStatus is the final call made on a stream and always
+	// occurs.
+	WriteStatus(s *Stream, statusCode codes.Code, statusDesc string) error
+
 	// Close tears down the transport. Once it is called, the transport
 	// should not be accessed any more. All the pending streams and their
 	// handlers will be terminated asynchronously.
 	Close() error
+
 	// RemoteAddr returns the remote network address.
 	RemoteAddr() net.Addr
 }