[lrs_stream_report] handle multiple clusters in LRS stream

- xdsclient.ReportLoad
  - create one LRS stream and one load.Store for each server address
  - to take just the server address, and return the load.Store
  - update EDS and LRS balancing policy to recreate LRS stream only when server address changes
- LRS stream (v2 and v3)
  - set feature `send_all_clusters` in `node`
  - handle `resp.Clusters` and only send load for those clusters
  - handle `resp.SendAllClusters` and send load for all clusters

examples/go.sum

@@ -33,15 +33,17 @@ cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
+github.com/census-instrumentation/opencensus-proto v0.2.1 h1:glEXhBS5PSLLv4IXzLA5yPRVX4bilULVyxxbrfOtDAk=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
 github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
 github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
-github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f h1:WBZRG4aNOuI15bLRrCgN8fCq8E5Xuty6jGbmSNEvSsU=
-github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
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 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/envoyproxy/go-control-plane v0.9.4 h1:rEvIZUSZ3fx39WIi3JkQqQBitGwpELBIYWeBVh6wn+E=
-github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
+github.com/envoyproxy/go-control-plane v0.9.6 h1:GgblEiDzxf5ajlAZY4aC8xp7DwkrGfauFNMGdB2bBv0=
+github.com/envoyproxy/go-control-plane v0.9.6/go.mod h1:GFqM7v0B62MraO4PWRedIbhThr/Rf7ev6aHOOPXeaDA=
 github.com/envoyproxy/protoc-gen-validate v0.1.0 h1:EQciDnbrYxy13PgWoY8AqoxGiPrpgBZ1R8UNe3ddc+A=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
@@ -110,6 +112,7 @@ github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
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+github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=

go.mod

@@ -3,10 +3,10 @@ module google.golang.org/grpc
 go 1.11
 
 require (
-	github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f
-	github.com/envoyproxy/go-control-plane v0.9.4
+	github.com/cncf/udpa/go v0.0.0-20200909154343-1f710aca26a9
+	github.com/envoyproxy/go-control-plane v0.9.6
 	github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
-	github.com/golang/protobuf v1.3.3
+	github.com/golang/protobuf v1.4.2
 	github.com/google/go-cmp v0.4.0
 	github.com/google/uuid v1.1.2
 	golang.org/x/net v0.0.0-20190311183353-d8887717615a

go.sum

@@ -1,70 +1,72 @@
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-github.com/client9/misspell v0.3.4 h1:ta993UF76GwbvJcIo3Y68y/M3WxlpEHPWIGDkJYwzJI=
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+google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
+google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
+google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
+google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc h1:/hemPrYIhOhy8zYrNj+069zDB68us2sMGsfkFJO0iZs=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

security/advancedtls/go.sum

@@ -36,9 +36,10 @@ github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
 github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
 github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
-github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
+github.com/cncf/udpa/go v0.0.0-20200313221541-5f7e5dd04533/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
+github.com/cncf/udpa/go v0.0.0-20200909154343-1f710aca26a9/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
+github.com/envoyproxy/go-control-plane v0.9.6/go.mod h1:GFqM7v0B62MraO4PWRedIbhThr/Rf7ev6aHOOPXeaDA=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
@@ -104,6 +105,7 @@ github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=

xds/internal/balancer/edsbalancer/eds_impl_test.go

@@ -690,7 +690,7 @@ func (s) TestEDS_LoadReport(t *testing.T) {
 	lsWrapper := &loadStoreWrapper{}
 	lsWrapper.update(loadStore, testClusterNames[0])
 	cw := &xdsClientWrapper{
-		load: lsWrapper,
+		loadWrapper: lsWrapper,
 	}
 
 	cc := testutils.NewTestClientConn(t)

xds/internal/balancer/edsbalancer/xds_client_wrapper.go

@@ -35,8 +35,7 @@ import (
 // balancer. It's defined so we can override xdsclientNew function in tests.
 type xdsClientInterface interface {
 	WatchEndpoints(clusterName string, edsCb func(xdsclient.EndpointsUpdate, error)) (cancel func())
-	LoadStore() *load.Store
-	ReportLoad(server string, clusterName string) (cancel func())
+	ReportLoad(server string) (loadStore *load.Store, cancel func())
 	Close()
 }
 
@@ -102,7 +101,12 @@ type xdsClientWrapper struct {
 	// xdsClient could come from attributes, or created with balancerName.
 	xdsClient xdsClientInterface
 
-	load *loadStoreWrapper
+	// loadWrapper is a wrapper with loadOriginal, with clusterName and
+	// edsServiceName. It's used children to report loads.
+	loadWrapper *loadStoreWrapper
+	// loadOriginal is the load.Store for reporting loads to lrsServerName. It's
+	// returned by the client.
+	loadOriginal *load.Store
 	// edsServiceName is the edsServiceName currently being watched, not
 	// necessary the edsServiceName from service config.
 	//
@@ -127,7 +131,7 @@ func newXDSClientWrapper(newEDSUpdate func(xdsclient.EndpointsUpdate, error), bb
 		logger:       logger,
 		newEDSUpdate: newEDSUpdate,
 		bbo:          bbo,
-		load:         &loadStoreWrapper{},
+		loadWrapper:  &loadStoreWrapper{},
 	}
 }
 
@@ -248,43 +252,51 @@ func (c *xdsClientWrapper) startLoadReport(loadReportServer *string) {
 	}
 	c.loadReportServer = loadReportServer
 	if c.loadReportServer != nil {
-		c.cancelLoadReport = c.xdsClient.ReportLoad(*c.loadReportServer, c.edsServiceName)
+		c.loadOriginal, c.cancelLoadReport = c.xdsClient.ReportLoad(*c.loadReportServer)
 	}
 }
 
 func (c *xdsClientWrapper) loadStore() load.PerClusterReporter {
-	if c == nil || c.load.store == nil {
+	if c == nil || c.loadWrapper.store == nil {
 		return nil
 	}
-	return c.load
+	return c.loadWrapper
 }
 
 // handleUpdate applies the service config and attributes updates to the client,
 // including updating the xds_client to use, and updating the EDS name to watch.
 func (c *xdsClientWrapper) handleUpdate(config *EDSConfig, attr *attributes.Attributes) {
 	clientChanged := c.updateXDSClient(config, attr)
 
+	var updateLoadStore bool
+
 	// Need to restart EDS watch when one of the following happens:
 	// - the xds_client is updated
 	// - the xds_client didn't change, but the edsServiceName changed
 	if clientChanged || c.edsServiceName != config.EDSServiceName {
 		c.edsServiceName = config.EDSServiceName
 		c.startEndpointsWatch()
+		updateLoadStore = true
+	}
+
+	// Only need to restart load reporting when:
+	// - the loadReportServer name changed
+	if !equalStringPointers(c.loadReportServer, config.LrsLoadReportingServerName) {
+		c.startLoadReport(config.LrsLoadReportingServerName)
+		updateLoadStore = true
+	}
+
+	if updateLoadStore {
 		// TODO: this update for the LRS service name is too early. It should
 		// only apply to the new EDS response. But this is applied to the RPCs
 		// before the new EDS response. To fully fix this, the EDS balancer
 		// needs to do a graceful switch to another EDS implementation.
 		//
 		// This is OK for now, because we don't actually expect edsServiceName
 		// to change. Fix this (a bigger change) will happen later.
-		c.load.update(c.xdsClient.LoadStore(), c.edsServiceName)
+		c.loadWrapper.update(c.loadOriginal, c.edsServiceName)
 	}
 
-	// Only need to restart load reporting when:
-	// - the loadReportServer name changed
-	if !equalStringPointers(c.loadReportServer, config.LrsLoadReportingServerName) {
-		c.startLoadReport(config.LrsLoadReportingServerName)
-	}
 }
 
 func (c *xdsClientWrapper) cancelWatch() {

xds/internal/balancer/edsbalancer/xds_lrs_test.go

@@ -66,7 +66,7 @@ func (s) TestXDSLoadReporting(t *testing.T) {
 	if err != nil {
 		t.Fatalf("xdsClient.ReportLoad failed with error: %v", err)
 	}
-	if got.Server != "" || got.Cluster != testEDSClusterName {
-		t.Fatalf("xdsClient.ReportLoad called with {%v, %v}: want {\"\", %v}", got.Server, got.Cluster, testEDSClusterName)
+	if got.Server != "" {
+		t.Fatalf("xdsClient.ReportLoad called with {%v}: want {\"\"}", got.Server)
 	}
 }