Move code out of balancer/xds. (#2950)

We will have a root level xds/ directory which will eventually contain
all xDS implementation including balancer, resolver, client etc.

The new structure looks something like this:

grpc/
|
+--xds/
    |
    +--internal/
    |  |
    |  +--balancer/
    |     |
    |     +--edsbalancer/
    |     |
    |     +--lrs/
    |     |
    |     +--orca/
    |
    +--experimental/

Users need to import grpc/xds/experimental package to get all xds
functionality, and this will eventually be moved to grpc/xds.

Also, moved grpc/balancer/internal/wrr to grpc/internal/wrr.

vet.sh

@@ -110,9 +110,9 @@ staticcheck -go 1.9 -checks 'inherit,-ST1015' -ignore '
 google.golang.org/grpc/balancer.go:SA1019
 google.golang.org/grpc/balancer/grpclb/grpclb_remote_balancer.go:SA1019
 google.golang.org/grpc/balancer/roundrobin/roundrobin_test.go:SA1019
-google.golang.org/grpc/balancer/xds/edsbalancer/balancergroup.go:SA1019
-google.golang.org/grpc/balancer/xds/xds.go:SA1019
-google.golang.org/grpc/balancer/xds/xds_client.go:SA1019
+google.golang.org/grpc/xds/internal/balancer/edsbalancer/balancergroup.go:SA1019
+google.golang.org/grpc/xds/internal/balancer/xds.go:SA1019
+google.golang.org/grpc/xds/internal/balancer/xds_client.go:SA1019
 google.golang.org/grpc/balancer_conn_wrappers.go:SA1019
 google.golang.org/grpc/balancer_test.go:SA1019
 google.golang.org/grpc/benchmark/benchmain/main.go:SA1019

xds/experimental/xds_experimental.go

@@ -0,0 +1,32 @@
+/*
+ *
+ * Copyright 2019 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package experimental contains xds implementation, still in experimental
+// state. Users only need to import this package to get all xds functionality.
+// Things are expected to change fast until we get to a stable state, at
+// which point, all this will be moved to the xds package.
+package experimental
+
+import (
+	"google.golang.org/grpc/balancer"
+	xdsbalancer "google.golang.org/grpc/xds/internal/balancer"
+)
+
+func init() {
+	balancer.Register(xdsbalancer.NewBalancerBuilder())
+}

xds/internal/balancer/edsbalancer/balancergroup.go

@@ -22,13 +22,13 @@ import (
 
 	"google.golang.org/grpc/balancer"
 	"google.golang.org/grpc/balancer/base"
-	"google.golang.org/grpc/balancer/internal/wrr"
-	"google.golang.org/grpc/balancer/xds/internal"
-	orcapb "google.golang.org/grpc/balancer/xds/internal/proto/udpa/data/orca/v1/orca_load_report"
-	"google.golang.org/grpc/balancer/xds/lrs"
 	"google.golang.org/grpc/connectivity"
 	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/internal/wrr"
 	"google.golang.org/grpc/resolver"
+	"google.golang.org/grpc/xds/internal"
+	"google.golang.org/grpc/xds/internal/balancer/lrs"
+	orcapb "google.golang.org/grpc/xds/internal/proto/udpa/data/orca/v1/orca_load_report"
 )
 
 type pickerState struct {

xds/internal/balancer/edsbalancer/balancergroup_test.go

@@ -23,10 +23,10 @@ import (
 
 	"google.golang.org/grpc/balancer"
 	"google.golang.org/grpc/balancer/roundrobin"
-	"google.golang.org/grpc/balancer/xds/internal"
-	orcapb "google.golang.org/grpc/balancer/xds/internal/proto/udpa/data/orca/v1/orca_load_report"
 	"google.golang.org/grpc/connectivity"
 	"google.golang.org/grpc/resolver"
+	"google.golang.org/grpc/xds/internal"
+	orcapb "google.golang.org/grpc/xds/internal/proto/udpa/data/orca/v1/orca_load_report"
 )
 
 var (

xds/internal/balancer/edsbalancer/edsbalancer.go

@@ -28,16 +28,16 @@ import (
 	"google.golang.org/grpc/balancer"
 	"google.golang.org/grpc/balancer/roundrobin"
 	"google.golang.org/grpc/balancer/weightedroundrobin"
-	"google.golang.org/grpc/balancer/xds/internal"
-	edspb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/eds"
-	endpointpb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/endpoint/endpoint"
-	percentpb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/type/percent"
-	"google.golang.org/grpc/balancer/xds/lrs"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/connectivity"
 	"google.golang.org/grpc/grpclog"
 	"google.golang.org/grpc/resolver"
 	"google.golang.org/grpc/status"
+	"google.golang.org/grpc/xds/internal"
+	"google.golang.org/grpc/xds/internal/balancer/lrs"
+	edspb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/eds"
+	endpointpb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/endpoint/endpoint"
+	percentpb "google.golang.org/grpc/xds/internal/proto/envoy/type/percent"
 )
 
 type localityConfig struct {

xds/internal/balancer/edsbalancer/edsbalancer_test.go

@@ -27,14 +27,14 @@ import (
 	typespb "github.com/golang/protobuf/ptypes/wrappers"
 	"google.golang.org/grpc/balancer"
 	"google.golang.org/grpc/balancer/roundrobin"
-	"google.golang.org/grpc/balancer/xds/internal"
-	addresspb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/address"
-	basepb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/base"
-	edspb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/eds"
-	endpointpb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/endpoint/endpoint"
-	percentpb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/type/percent"
 	"google.golang.org/grpc/connectivity"
 	"google.golang.org/grpc/resolver"
+	"google.golang.org/grpc/xds/internal"
+	addresspb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/address"
+	basepb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/base"
+	edspb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/eds"
+	endpointpb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/endpoint/endpoint"
+	percentpb "google.golang.org/grpc/xds/internal/proto/envoy/type/percent"
 )
 
 var (

xds/internal/balancer/edsbalancer/test_util_test.go

@@ -23,9 +23,9 @@ import (
 
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/balancer"
-	"google.golang.org/grpc/balancer/xds/internal"
 	"google.golang.org/grpc/connectivity"
 	"google.golang.org/grpc/resolver"
+	"google.golang.org/grpc/xds/internal"
 )
 
 var (

xds/internal/balancer/edsbalancer/util.go

@@ -16,7 +16,7 @@
 
 package edsbalancer
 
-import "google.golang.org/grpc/balancer/internal/wrr"
+import "google.golang.org/grpc/internal/wrr"
 
 type dropper struct {
 	// Drop rate will be numerator/denominator.

xds/internal/balancer/edsbalancer/util_test.go

@@ -20,7 +20,7 @@ import (
 	"sync"
 	"testing"
 
-	"google.golang.org/grpc/balancer/internal/wrr"
+	"google.golang.org/grpc/internal/wrr"
 )
 
 // testWRR is a deterministic WRR implementation.

xds/internal/balancer/lrs/lrs.go

@@ -26,13 +26,13 @@ import (
 	"github.com/golang/protobuf/ptypes"
 	structpb "github.com/golang/protobuf/ptypes/struct"
 	"google.golang.org/grpc"
-	"google.golang.org/grpc/balancer/xds/internal"
-	basepb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/base"
-	loadreportpb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/endpoint/load_report"
-	lrsgrpc "google.golang.org/grpc/balancer/xds/internal/proto/envoy/service/load_stats/v2/lrs"
-	lrspb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/service/load_stats/v2/lrs"
 	"google.golang.org/grpc/grpclog"
 	"google.golang.org/grpc/internal/backoff"
+	"google.golang.org/grpc/xds/internal"
+	basepb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/base"
+	loadreportpb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/endpoint/load_report"
+	lrsgrpc "google.golang.org/grpc/xds/internal/proto/envoy/service/load_stats/v2/lrs"
+	lrspb "google.golang.org/grpc/xds/internal/proto/envoy/service/load_stats/v2/lrs"
 )
 
 const negativeOneUInt64 = ^uint64(0)

xds/internal/balancer/lrs/lrs_test.go

@@ -33,13 +33,13 @@ import (
 	structpb "github.com/golang/protobuf/ptypes/struct"
 	"github.com/google/go-cmp/cmp"
 	"google.golang.org/grpc"
-	"google.golang.org/grpc/balancer/xds/internal"
-	basepb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/base"
-	loadreportpb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/endpoint/load_report"
-	lrsgrpc "google.golang.org/grpc/balancer/xds/internal/proto/envoy/service/load_stats/v2/lrs"
-	lrspb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/service/load_stats/v2/lrs"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
+	"google.golang.org/grpc/xds/internal"
+	basepb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/base"
+	loadreportpb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/endpoint/load_report"
+	lrsgrpc "google.golang.org/grpc/xds/internal/proto/envoy/service/load_stats/v2/lrs"
+	lrspb "google.golang.org/grpc/xds/internal/proto/envoy/service/load_stats/v2/lrs"
 )
 
 const testService = "grpc.service.test"

xds/internal/balancer/orca/orca.go

@@ -19,10 +19,10 @@ package orca
 
 import (
 	"github.com/golang/protobuf/proto"
-	orcapb "google.golang.org/grpc/balancer/xds/internal/proto/udpa/data/orca/v1/orca_load_report"
 	"google.golang.org/grpc/grpclog"
 	"google.golang.org/grpc/internal/balancerload"
 	"google.golang.org/grpc/metadata"
+	orcapb "google.golang.org/grpc/xds/internal/proto/udpa/data/orca/v1/orca_load_report"
 )
 
 const mdKey = "X-Endpoint-Load-Metrics-Bin"

xds/internal/balancer/orca/orca_test.go

@@ -22,8 +22,8 @@ import (
 	"testing"
 
 	"github.com/golang/protobuf/proto"
-	orcapb "google.golang.org/grpc/balancer/xds/internal/proto/udpa/data/orca/v1/orca_load_report"
 	"google.golang.org/grpc/metadata"
+	orcapb "google.golang.org/grpc/xds/internal/proto/udpa/data/orca/v1/orca_load_report"
 )
 
 var (

xds/internal/balancer/xds.go

@@ -16,9 +16,8 @@
  *
  */
 
-// Package xds implements a balancer that communicates with a remote balancer using the Envoy xDS
-// protocol.
-package xds
+// Package balancer contains xds balancer implementation.
+package balancer
 
 import (
 	"context"
@@ -30,14 +29,14 @@ import (
 
 	"github.com/golang/protobuf/proto"
 	"google.golang.org/grpc/balancer"
-	"google.golang.org/grpc/balancer/xds/edsbalancer"
-	cdspb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/cds"
-	edspb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/eds"
-	"google.golang.org/grpc/balancer/xds/lrs"
 	"google.golang.org/grpc/connectivity"
 	"google.golang.org/grpc/grpclog"
 	"google.golang.org/grpc/resolver"
 	"google.golang.org/grpc/serviceconfig"
+	"google.golang.org/grpc/xds/internal/balancer/edsbalancer"
+	"google.golang.org/grpc/xds/internal/balancer/lrs"
+	cdspb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/cds"
+	edspb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/eds"
 )
 
 const (
@@ -55,13 +54,11 @@ var (
 	}
 )
 
-func init() {
-	balancer.Register(newXDSBalancerBuilder())
-}
-
 type xdsBalancerBuilder struct{}
 
-func newXDSBalancerBuilder() balancer.Builder {
+// NewBalancerBuilder creates a new implementation of the balancer.Builder
+// interface for the xDS balancer.
+func NewBalancerBuilder() balancer.Builder {
 	return &xdsBalancerBuilder{}
 }
 

xds/internal/balancer/xds_client.go

@@ -16,7 +16,7 @@
  *
  */
 
-package xds
+package balancer
 
 import (
 	"context"
@@ -28,16 +28,16 @@ import (
 	structpb "github.com/golang/protobuf/ptypes/struct"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/balancer"
-	"google.golang.org/grpc/balancer/xds/internal"
-	cdspb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/cds"
-	basepb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/base"
-	discoverypb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/discovery"
-	edspb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/eds"
-	adsgrpc "google.golang.org/grpc/balancer/xds/internal/proto/envoy/service/discovery/v2/ads"
-	"google.golang.org/grpc/balancer/xds/lrs"
 	"google.golang.org/grpc/grpclog"
 	"google.golang.org/grpc/internal/backoff"
 	"google.golang.org/grpc/internal/channelz"
+	"google.golang.org/grpc/xds/internal"
+	"google.golang.org/grpc/xds/internal/balancer/lrs"
+	cdspb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/cds"
+	basepb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/base"
+	discoverypb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/discovery"
+	edspb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/eds"
+	adsgrpc "google.golang.org/grpc/xds/internal/proto/envoy/service/discovery/v2/ads"
 )
 
 const (

xds/internal/balancer/xds_client_test.go

@@ -16,7 +16,7 @@
  *
  */
 
-package xds
+package balancer
 
 import (
 	"context"
@@ -33,18 +33,18 @@ import (
 	wrpb "github.com/golang/protobuf/ptypes/wrappers"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/balancer"
-	"google.golang.org/grpc/balancer/xds/internal"
-	cdspb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/cds"
-	addresspb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/address"
-	basepb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/base"
-	discoverypb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/discovery"
-	edspb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/eds"
-	endpointpb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/endpoint/endpoint"
-	adsgrpc "google.golang.org/grpc/balancer/xds/internal/proto/envoy/service/discovery/v2/ads"
-	lrsgrpc "google.golang.org/grpc/balancer/xds/internal/proto/envoy/service/load_stats/v2/lrs"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/resolver"
 	"google.golang.org/grpc/status"
+	"google.golang.org/grpc/xds/internal"
+	cdspb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/cds"
+	addresspb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/address"
+	basepb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/base"
+	discoverypb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/discovery"
+	edspb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/eds"
+	endpointpb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/endpoint/endpoint"
+	adsgrpc "google.golang.org/grpc/xds/internal/proto/envoy/service/discovery/v2/ads"
+	lrsgrpc "google.golang.org/grpc/xds/internal/proto/envoy/service/load_stats/v2/lrs"
 )
 
 var (

xds/internal/balancer/xds_lrs_test.go

@@ -16,7 +16,7 @@
  *
  */
 
-package xds
+package balancer
 
 import (
 	"io"
@@ -29,13 +29,13 @@ import (
 	structpb "github.com/golang/protobuf/ptypes/struct"
 	"github.com/google/go-cmp/cmp"
 	"google.golang.org/grpc/balancer"
-	"google.golang.org/grpc/balancer/xds/internal"
-	basepb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/base"
-	lrsgrpc "google.golang.org/grpc/balancer/xds/internal/proto/envoy/service/load_stats/v2/lrs"
-	lrspb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/service/load_stats/v2/lrs"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/resolver"
 	"google.golang.org/grpc/status"
+	"google.golang.org/grpc/xds/internal"
+	basepb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/base"
+	lrsgrpc "google.golang.org/grpc/xds/internal/proto/envoy/service/load_stats/v2/lrs"
+	lrspb "google.golang.org/grpc/xds/internal/proto/envoy/service/load_stats/v2/lrs"
 )
 
 type lrsServer struct {

xds/internal/balancer/xds_test.go

@@ -16,7 +16,7 @@
  *
  */
 
-package xds
+package balancer
 
 import (
 	"encoding/json"
@@ -27,18 +27,19 @@ import (
 
 	"github.com/golang/protobuf/proto"
 	"google.golang.org/grpc/balancer"
-	discoverypb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/discovery"
-	edspb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/eds"
-	"google.golang.org/grpc/balancer/xds/lrs"
 	"google.golang.org/grpc/connectivity"
 	"google.golang.org/grpc/internal/grpctest"
 	"google.golang.org/grpc/internal/leakcheck"
 	"google.golang.org/grpc/resolver"
+	"google.golang.org/grpc/xds/internal/balancer/lrs"
+	discoverypb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/discovery"
+	edspb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/eds"
 )
 
 var lbABuilder = &balancerABuilder{}
 
 func init() {
+	balancer.Register(&xdsBalancerBuilder{})
 	balancer.Register(lbABuilder)
 	balancer.Register(&balancerBBuilder{})
 }

xds/internal/internal.go

@@ -20,7 +20,7 @@ package internal
 import (
 	"fmt"
 
-	basepb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/base"
+	basepb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/base"
 )
 
 // Locality is xds.Locality without XXX fields, so it can be used as map

xds/internal/internal_test.go

@@ -24,7 +24,7 @@ import (
 	"unicode"
 
 	"github.com/google/go-cmp/cmp"
-	basepb "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/base"
+	basepb "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/base"
 )
 
 const ignorePrefix = "XXX_"

xds/internal/proto/envoy/api/v2/auth/cert/cert.pb.go

@@ -7,9 +7,9 @@ import proto "github.com/golang/protobuf/proto"
 import fmt "fmt"
 import math "math"
 import wrappers "github.com/golang/protobuf/ptypes/wrappers"
-import base "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/base"
-import config_source "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/config_source"
-import _ "google.golang.org/grpc/balancer/xds/internal/proto/validate"
+import base "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/base"
+import config_source "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/config_source"
+import _ "google.golang.org/grpc/xds/internal/proto/validate"
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal

xds/internal/proto/envoy/api/v2/cds/cds.pb.go

@@ -11,18 +11,18 @@ import duration "github.com/golang/protobuf/ptypes/duration"
 import _struct "github.com/golang/protobuf/ptypes/struct"
 import wrappers "github.com/golang/protobuf/ptypes/wrappers"
 import _ "google.golang.org/genproto/googleapis/api/annotations"
-import cert "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/auth/cert"
-import circuit_breaker "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/cluster/circuit_breaker"
-import outlier_detection "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/cluster/outlier_detection"
-import address "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/address"
-import base "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/base"
-import config_source "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/config_source"
-import health_check "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/health_check"
-import protocol "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/protocol"
-import discovery "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/discovery"
-import eds "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/eds"
-import percent "google.golang.org/grpc/balancer/xds/internal/proto/envoy/type/percent"
-import _ "google.golang.org/grpc/balancer/xds/internal/proto/validate"
+import cert "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/auth/cert"
+import circuit_breaker "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/cluster/circuit_breaker"
+import outlier_detection "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/cluster/outlier_detection"
+import address "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/address"
+import base "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/base"
+import config_source "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/config_source"
+import health_check "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/health_check"
+import protocol "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/protocol"
+import discovery "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/discovery"
+import eds "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/eds"
+import percent "google.golang.org/grpc/xds/internal/proto/envoy/type/percent"
+import _ "google.golang.org/grpc/xds/internal/proto/validate"
 
 import (
 	context "golang.org/x/net/context"

xds/internal/proto/envoy/api/v2/cluster/circuit_breaker/circuit_breaker.pb.go

@@ -7,7 +7,7 @@ import proto "github.com/golang/protobuf/proto"
 import fmt "fmt"
 import math "math"
 import wrappers "github.com/golang/protobuf/ptypes/wrappers"
-import base "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/base"
+import base "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/base"
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal

xds/internal/proto/envoy/api/v2/cluster/outlier_detection/outlier_detection.pb.go

@@ -8,7 +8,7 @@ import fmt "fmt"
 import math "math"
 import duration "github.com/golang/protobuf/ptypes/duration"
 import wrappers "github.com/golang/protobuf/ptypes/wrappers"
-import _ "google.golang.org/grpc/balancer/xds/internal/proto/validate"
+import _ "google.golang.org/grpc/xds/internal/proto/validate"
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal

xds/internal/proto/envoy/api/v2/core/address/address.pb.go

@@ -7,8 +7,8 @@ import proto "github.com/golang/protobuf/proto"
 import fmt "fmt"
 import math "math"
 import wrappers "github.com/golang/protobuf/ptypes/wrappers"
-import base "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/base"
-import _ "google.golang.org/grpc/balancer/xds/internal/proto/validate"
+import base "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/base"
+import _ "google.golang.org/grpc/xds/internal/proto/validate"
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal

xds/internal/proto/envoy/api/v2/core/base/base.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // source: envoy/api/v2/core/base.proto
 
-package core
+package envoy_api_v2_core
 
 import proto "github.com/golang/protobuf/proto"
 import fmt "fmt"
@@ -9,8 +9,8 @@ import math "math"
 import any "github.com/golang/protobuf/ptypes/any"
 import _struct "github.com/golang/protobuf/ptypes/struct"
 import wrappers "github.com/golang/protobuf/ptypes/wrappers"
-import percent "google.golang.org/grpc/balancer/xds/internal/proto/envoy/type/percent"
-import _ "google.golang.org/grpc/balancer/xds/internal/proto/validate"
+import percent "google.golang.org/grpc/xds/internal/proto/envoy/type/percent"
+import _ "google.golang.org/grpc/xds/internal/proto/validate"
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal

xds/internal/proto/envoy/api/v2/core/config_source/config_source.pb.go

@@ -8,8 +8,8 @@ import fmt "fmt"
 import math "math"
 import duration "github.com/golang/protobuf/ptypes/duration"
 import wrappers "github.com/golang/protobuf/ptypes/wrappers"
-import grpc_service "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/grpc_service"
-import _ "google.golang.org/grpc/balancer/xds/internal/proto/validate"
+import grpc_service "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/grpc_service"
+import _ "google.golang.org/grpc/xds/internal/proto/validate"
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal

xds/internal/proto/envoy/api/v2/core/grpc_service/grpc_service.pb.go

@@ -10,8 +10,8 @@ import any "github.com/golang/protobuf/ptypes/any"
 import duration "github.com/golang/protobuf/ptypes/duration"
 import empty "github.com/golang/protobuf/ptypes/empty"
 import _struct "github.com/golang/protobuf/ptypes/struct"
-import base "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/base"
-import _ "google.golang.org/grpc/balancer/xds/internal/proto/validate"
+import base "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/base"
+import _ "google.golang.org/grpc/xds/internal/proto/validate"
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal

xds/internal/proto/envoy/api/v2/core/health_check/health_check.pb.go

@@ -10,9 +10,9 @@ import any "github.com/golang/protobuf/ptypes/any"
 import duration "github.com/golang/protobuf/ptypes/duration"
 import _struct "github.com/golang/protobuf/ptypes/struct"
 import wrappers "github.com/golang/protobuf/ptypes/wrappers"
-import base "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/base"
-import _range "google.golang.org/grpc/balancer/xds/internal/proto/envoy/type/range"
-import _ "google.golang.org/grpc/balancer/xds/internal/proto/validate"
+import base "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/base"
+import _range "google.golang.org/grpc/xds/internal/proto/envoy/type/range"
+import _ "google.golang.org/grpc/xds/internal/proto/validate"
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal

xds/internal/proto/envoy/api/v2/core/protocol/protocol.pb.go

@@ -8,7 +8,7 @@ import fmt "fmt"
 import math "math"
 import duration "github.com/golang/protobuf/ptypes/duration"
 import wrappers "github.com/golang/protobuf/ptypes/wrappers"
-import _ "google.golang.org/grpc/balancer/xds/internal/proto/validate"
+import _ "google.golang.org/grpc/xds/internal/proto/validate"
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal

xds/internal/proto/envoy/api/v2/discovery/discovery.pb.go

@@ -8,7 +8,7 @@ import fmt "fmt"
 import math "math"
 import any "github.com/golang/protobuf/ptypes/any"
 import status "google.golang.org/genproto/googleapis/rpc/status"
-import base "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/base"
+import base "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/base"
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal

xds/internal/proto/envoy/api/v2/eds/eds.pb.go

@@ -9,10 +9,10 @@ import math "math"
 import duration "github.com/golang/protobuf/ptypes/duration"
 import wrappers "github.com/golang/protobuf/ptypes/wrappers"
 import _ "google.golang.org/genproto/googleapis/api/annotations"
-import discovery "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/discovery"
-import endpoint "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/endpoint/endpoint"
-import percent "google.golang.org/grpc/balancer/xds/internal/proto/envoy/type/percent"
-import _ "google.golang.org/grpc/balancer/xds/internal/proto/validate"
+import discovery "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/discovery"
+import endpoint "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/endpoint/endpoint"
+import percent "google.golang.org/grpc/xds/internal/proto/envoy/type/percent"
+import _ "google.golang.org/grpc/xds/internal/proto/validate"
 
 import (
 	context "golang.org/x/net/context"

xds/internal/proto/envoy/api/v2/endpoint/endpoint/endpoint.pb.go

@@ -7,10 +7,10 @@ import proto "github.com/golang/protobuf/proto"
 import fmt "fmt"
 import math "math"
 import wrappers "github.com/golang/protobuf/ptypes/wrappers"
-import address "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/address"
-import base "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/base"
-import health_check "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/health_check"
-import _ "google.golang.org/grpc/balancer/xds/internal/proto/validate"
+import address "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/address"
+import base "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/base"
+import health_check "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/health_check"
+import _ "google.golang.org/grpc/xds/internal/proto/validate"
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal

xds/internal/proto/envoy/api/v2/endpoint/load_report/load_report.pb.go

@@ -8,9 +8,9 @@ import fmt "fmt"
 import math "math"
 import duration "github.com/golang/protobuf/ptypes/duration"
 import _struct "github.com/golang/protobuf/ptypes/struct"
-import address "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/address"
-import base "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/base"
-import _ "google.golang.org/grpc/balancer/xds/internal/proto/validate"
+import address "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/address"
+import base "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/base"
+import _ "google.golang.org/grpc/xds/internal/proto/validate"
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal

xds/internal/proto/envoy/service/discovery/v2/ads/ads.pb.go

@@ -6,7 +6,7 @@ package v2
 import proto "github.com/golang/protobuf/proto"
 import fmt "fmt"
 import math "math"
-import discovery "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/discovery"
+import discovery "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/discovery"
 
 import (
 	context "golang.org/x/net/context"

xds/internal/proto/envoy/service/load_stats/v2/lrs/lrs.pb.go

@@ -7,9 +7,9 @@ import proto "github.com/golang/protobuf/proto"
 import fmt "fmt"
 import math "math"
 import duration "github.com/golang/protobuf/ptypes/duration"
-import base "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/core/base"
-import load_report "google.golang.org/grpc/balancer/xds/internal/proto/envoy/api/v2/endpoint/load_report"
-import _ "google.golang.org/grpc/balancer/xds/internal/proto/validate"
+import base "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/core/base"
+import load_report "google.golang.org/grpc/xds/internal/proto/envoy/api/v2/endpoint/load_report"
+import _ "google.golang.org/grpc/xds/internal/proto/validate"
 
 import (
 	context "golang.org/x/net/context"

xds/internal/proto/envoy/type/percent/percent.pb.go

@@ -6,7 +6,7 @@ package envoy_type
 import proto "github.com/golang/protobuf/proto"
 import fmt "fmt"
 import math "math"
-import _ "google.golang.org/grpc/balancer/xds/internal/proto/validate"
+import _ "google.golang.org/grpc/xds/internal/proto/validate"
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal

xds/internal/proto/udpa/data/orca/v1/orca_load_report/orca_load_report.pb.go

@@ -6,7 +6,7 @@ package v1
 import proto "github.com/golang/protobuf/proto"
 import fmt "fmt"
 import math "math"
-import _ "google.golang.org/grpc/balancer/xds/internal/proto/validate"
+import _ "google.golang.org/grpc/xds/internal/proto/validate"
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal

xds/internal/proto/udpa/service/orca/v1/orca/orca.pb.go

@@ -7,8 +7,8 @@ import proto "github.com/golang/protobuf/proto"
 import fmt "fmt"
 import math "math"
 import duration "github.com/golang/protobuf/ptypes/duration"
-import orca_load_report "google.golang.org/grpc/balancer/xds/internal/proto/udpa/data/orca/v1/orca_load_report"
-import _ "google.golang.org/grpc/balancer/xds/internal/proto/validate"
+import orca_load_report "google.golang.org/grpc/xds/internal/proto/udpa/data/orca/v1/orca_load_report"
+import _ "google.golang.org/grpc/xds/internal/proto/validate"
 
 import (
 	context "golang.org/x/net/context"

xds/internal/proto/validate/validate.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // source: validate/validate.proto
 
-package validate // import "google.golang.org/grpc/balancer/xds/internal/proto/validate"
+package validate // import "google.golang.org/grpc/xds/internal/proto/validate"
 
 import proto "github.com/golang/protobuf/proto"
 import fmt "fmt"

xds/internal/regenerate_scripts/README.md

@@ -1,7 +1,7 @@
 ## Generate new pb.go files
 
  1. Update
-[DATA_PLANE_API_VERSION](https://github.com/grpc/grpc-go/blob/master/balancer/xds/internal/regenerate_scripts/envoy-proto-gen.sh#L3)
+[DATA_PLANE_API_VERSION](https://github.com/grpc/grpc-go/blob/master/xds/internal/regenerate_scripts/envoy-proto-gen.sh#L3)
 to a new commit for
 [envoyproxy/data-plane-api](https://github.com/envoyproxy/data-plane-api/commits/master).
  1. Run `./envoy-proto-gen.sh` in __this__ directory (and fingers crossed).

xds/internal/regenerate_scripts/envoy-proto-gen.sh

@@ -27,6 +27,6 @@ cd ../data-plane-api
 
 git apply ../utils/data-plane-api.patch
 # proto-gen.sh build all packages required for grpc xds implementation and move
-# proto generated code to grpc/balancer/xds/internal/proto subdirectory.
+# proto generated code to grpc/xds/internal/proto subdirectory.
 ../utils/proto-gen.sh
 

xds/internal/regenerate_scripts/utils/data-plane-api.patch

@@ -7,7 +7,7 @@ index c68ccbd..e6cc8cb 100644
  _GO_PROTO_SUFFIX = "_go_proto"
  _GO_GRPC_SUFFIX = "_go_grpc"
 -_GO_IMPORTPATH_PREFIX = "github.com/envoyproxy/data-plane-api/api/"
-+_GO_IMPORTPATH_PREFIX = "google.golang.org/grpc/balancer/xds/internal/proto/"
++_GO_IMPORTPATH_PREFIX = "google.golang.org/grpc/xds/internal/proto/"
  
  def _Suffix(d, suffix):
      return d + suffix

xds/internal/regenerate_scripts/utils/protoc-gen-validate.patch

@@ -7,7 +7,7 @@ index 8a3d063..939d997 100644
  go_proto_library(
      name = "go_default_library",
 -    importpath = "github.com/envoyproxy/protoc-gen-validate/validate",
-+    importpath = "google.golang.org/grpc/balancer/xds/internal/proto/validate",
++    importpath = "google.golang.org/grpc/xds/internal/proto/validate",
      proto = ":validate_proto",
      visibility = ["//visibility:public"],
  )
@@ -20,7 +20,7 @@ index 864ad86..6165f39 100644
  package validate;
 
 -option go_package = "github.com/envoyproxy/protoc-gen-validate/validate";
-+option go_package = "google.golang.org/grpc/balancer/xds/internal/proto/validate";
++option go_package = "google.golang.org/grpc/xds/internal/proto/validate";
  option java_package = "io.envoyproxy.pgv.validate";
 
  import "google/protobuf/descriptor.proto";