Merge pull request #10852 from Luap99/cobra

bump cobra to v1.2.1 and update the shell completion scripts

45 files changed, 1306 insertions, 629 deletions

diff --git a/vendor/google.golang.org/grpc/.travis.yml b/vendor/google.golang.org/grpc/.travis.yml
index 3e495fa23..5847d94e5 100644
--- a/vendor/google.golang.org/grpc/.travis.yml
+++ b/vendor/google.golang.org/grpc/.travis.yml
@@ -35,7 +35,7 @@ install:
 
 script:
   - set -e
-  - if [[ -n "${TESTEXTRAS}" ]]; then examples/examples_test.sh; interop/interop_test.sh; make testsubmodule; exit 0; fi
+  - if [[ -n "${TESTEXTRAS}" ]]; then examples/examples_test.sh; security/advancedtls/examples/examples_test.sh; interop/interop_test.sh; make testsubmodule; exit 0; fi
   - if [[ -n "${VET}" ]]; then ./vet.sh; fi
   - if [[ -n "${GAE}" ]]; then make testappengine; exit 0; fi
   - if [[ -n "${RACE}" ]]; then make testrace; exit 0; fi
diff --git a/vendor/google.golang.org/grpc/Makefile b/vendor/google.golang.org/grpc/Makefile
index 3f661a787..1f0722f16 100644
--- a/vendor/google.golang.org/grpc/Makefile
+++ b/vendor/google.golang.org/grpc/Makefile
@@ -1,13 +1,13 @@
 all: vet test testrace
 
-build: deps
+build:
 	go build google.golang.org/grpc/...
 
 clean:
 	go clean -i google.golang.org/grpc/...
 
 deps:
-	go get -d -v google.golang.org/grpc/...
+	GO111MODULE=on go get -d -v google.golang.org/grpc/...
 
 proto:
 	@ if ! which protoc > /dev/null; then \
@@ -16,30 +16,18 @@ proto:
 	fi
 	go generate google.golang.org/grpc/...
 
-test: testdeps
+test:
 	go test -cpu 1,4 -timeout 7m google.golang.org/grpc/...
 
-testsubmodule: testdeps
+testsubmodule:
 	cd security/advancedtls && go test -cpu 1,4 -timeout 7m google.golang.org/grpc/security/advancedtls/...
 	cd security/authorization && go test -cpu 1,4 -timeout 7m google.golang.org/grpc/security/authorization/...
 
-testappengine: testappenginedeps
-	goapp test -cpu 1,4 -timeout 7m google.golang.org/grpc/...
-
-testappenginedeps:
-	goapp get -d -v -t -tags 'appengine appenginevm' google.golang.org/grpc/...
-
-testdeps:
-	go get -d -v -t google.golang.org/grpc/...
-
-testrace: testdeps
+testrace:
 	go test -race -cpu 1,4 -timeout 7m google.golang.org/grpc/...
 
-updatedeps:
-	go get -d -v -u -f google.golang.org/grpc/...
-
-updatetestdeps:
-	go get -d -v -t -u -f google.golang.org/grpc/...
+testdeps:
+	GO111MODULE=on go get -d -v -t google.golang.org/grpc/...
 
 vet: vetdeps
 	./vet.sh
@@ -51,14 +39,10 @@ vetdeps:
 	all \
 	build \
 	clean \
-	deps \
 	proto \
 	test \
 	testappengine \
 	testappenginedeps \
-	testdeps \
 	testrace \
-	updatedeps \
-	updatetestdeps \
 	vet \
 	vetdeps
diff --git a/vendor/google.golang.org/grpc/SECURITY.md b/vendor/google.golang.org/grpc/SECURITY.md
new file mode 100644
index 000000000..be6e10870
--- /dev/null
+++ b/vendor/google.golang.org/grpc/SECURITY.md
@@ -0,0 +1,3 @@
+# Security Policy
+
+For information on gRPC Security Policy and reporting potentional security issues, please see [gRPC CVE Process](https://github.com/grpc/proposal/blob/master/P4-grpc-cve-process.md).
diff --git a/vendor/google.golang.org/grpc/balancer/balancer.go b/vendor/google.golang.org/grpc/balancer/balancer.go
index 8bf359dbf..ab531f4c0 100644
--- a/vendor/google.golang.org/grpc/balancer/balancer.go
+++ b/vendor/google.golang.org/grpc/balancer/balancer.go
@@ -101,6 +101,9 @@ type SubConn interface {
 	// a new connection will be created.
 	//
 	// This will trigger a state transition for the SubConn.
+	//
+	// Deprecated: This method is now part of the ClientConn interface and will
+	// eventually be removed from here.
 	UpdateAddresses([]resolver.Address)
 	// Connect starts the connecting for this SubConn.
 	Connect()
@@ -143,6 +146,13 @@ type ClientConn interface {
 	// RemoveSubConn removes the SubConn from ClientConn.
 	// The SubConn will be shutdown.
 	RemoveSubConn(SubConn)
+	// UpdateAddresses updates the addresses used in the passed in SubConn.
+	// gRPC checks if the currently connected address is still in the new list.
+	// If so, the connection will be kept. Else, the connection will be
+	// gracefully closed, and a new connection will be created.
+	//
+	// This will trigger a state transition for the SubConn.
+	UpdateAddresses(SubConn, []resolver.Address)
 
 	// UpdateState notifies gRPC that the balancer's internal state has
 	// changed.
@@ -174,6 +184,10 @@ type BuildOptions struct {
 	Dialer func(context.Context, string) (net.Conn, error)
 	// ChannelzParentID is the entity parent's channelz unique identification number.
 	ChannelzParentID int64
+	// CustomUserAgent is the custom user agent set on the parent ClientConn.
+	// The balancer should set the same custom user agent if it creates a
+	// ClientConn.
+	CustomUserAgent string
 	// Target contains the parsed address info of the dial target. It is the same resolver.Target as
 	// passed to the resolver.
 	// See the documentation for the resolver.Target type for details about what it contains.
diff --git a/vendor/google.golang.org/grpc/balancer/base/balancer.go b/vendor/google.golang.org/grpc/balancer/base/balancer.go
index 32d782f1c..c883efa0b 100644
--- a/vendor/google.golang.org/grpc/balancer/base/balancer.go
+++ b/vendor/google.golang.org/grpc/balancer/base/balancer.go
@@ -22,6 +22,7 @@ import (
 	"errors"
 	"fmt"
 
+	"google.golang.org/grpc/attributes"
 	"google.golang.org/grpc/balancer"
 	"google.golang.org/grpc/connectivity"
 	"google.golang.org/grpc/grpclog"
@@ -41,7 +42,7 @@ func (bb *baseBuilder) Build(cc balancer.ClientConn, opt balancer.BuildOptions)
 		cc:            cc,
 		pickerBuilder: bb.pickerBuilder,
 
-		subConns: make(map[resolver.Address]balancer.SubConn),
+		subConns: make(map[resolver.Address]subConnInfo),
 		scStates: make(map[balancer.SubConn]connectivity.State),
 		csEvltr:  &balancer.ConnectivityStateEvaluator{},
 		config:   bb.config,
@@ -57,6 +58,11 @@ func (bb *baseBuilder) Name() string {
 	return bb.name
 }
 
+type subConnInfo struct {
+	subConn balancer.SubConn
+	attrs   *attributes.Attributes
+}
+
 type baseBalancer struct {
 	cc            balancer.ClientConn
 	pickerBuilder PickerBuilder
@@ -64,7 +70,7 @@ type baseBalancer struct {
 	csEvltr *balancer.ConnectivityStateEvaluator
 	state   connectivity.State
 
-	subConns map[resolver.Address]balancer.SubConn
+	subConns map[resolver.Address]subConnInfo // `attributes` is stripped from the keys of this map (the addresses)
 	scStates map[balancer.SubConn]connectivity.State
 	picker   balancer.Picker
 	config   Config
@@ -101,23 +107,49 @@ func (b *baseBalancer) UpdateClientConnState(s balancer.ClientConnState) error {
 	// addrsSet is the set converted from addrs, it's used for quick lookup of an address.
 	addrsSet := make(map[resolver.Address]struct{})
 	for _, a := range s.ResolverState.Addresses {
-		addrsSet[a] = struct{}{}
-		if _, ok := b.subConns[a]; !ok {
+		// Strip attributes from addresses before using them as map keys. So
+		// that when two addresses only differ in attributes pointers (but with
+		// the same attribute content), they are considered the same address.
+		//
+		// Note that this doesn't handle the case where the attribute content is
+		// different. So if users want to set different attributes to create
+		// duplicate connections to the same backend, it doesn't work. This is
+		// fine for now, because duplicate is done by setting Metadata today.
+		//
+		// TODO: read attributes to handle duplicate connections.
+		aNoAttrs := a
+		aNoAttrs.Attributes = nil
+		addrsSet[aNoAttrs] = struct{}{}
+		if scInfo, ok := b.subConns[aNoAttrs]; !ok {
 			// a is a new address (not existing in b.subConns).
+			//
+			// When creating SubConn, the original address with attributes is
+			// passed through. So that connection configurations in attributes
+			// (like creds) will be used.
 			sc, err := b.cc.NewSubConn([]resolver.Address{a}, balancer.NewSubConnOptions{HealthCheckEnabled: b.config.HealthCheck})
 			if err != nil {
 				logger.Warningf("base.baseBalancer: failed to create new SubConn: %v", err)
 				continue
 			}
-			b.subConns[a] = sc
+			b.subConns[aNoAttrs] = subConnInfo{subConn: sc, attrs: a.Attributes}
 			b.scStates[sc] = connectivity.Idle
 			sc.Connect()
+		} else {
+			// Always update the subconn's address in case the attributes
+			// changed.
+			//
+			// The SubConn does a reflect.DeepEqual of the new and old
+			// addresses. So this is a noop if the current address is the same
+			// as the old one (including attributes).
+			scInfo.attrs = a.Attributes
+			b.subConns[aNoAttrs] = scInfo
+			b.cc.UpdateAddresses(scInfo.subConn, []resolver.Address{a})
 		}
 	}
-	for a, sc := range b.subConns {
+	for a, scInfo := range b.subConns {
 		// a was removed by resolver.
 		if _, ok := addrsSet[a]; !ok {
-			b.cc.RemoveSubConn(sc)
+			b.cc.RemoveSubConn(scInfo.subConn)
 			delete(b.subConns, a)
 			// Keep the state of this sc in b.scStates until sc's state becomes Shutdown.
 			// The entry will be deleted in UpdateSubConnState.
@@ -160,9 +192,10 @@ func (b *baseBalancer) regeneratePicker() {
 	readySCs := make(map[balancer.SubConn]SubConnInfo)
 
 	// Filter out all ready SCs from full subConn map.
-	for addr, sc := range b.subConns {
-		if st, ok := b.scStates[sc]; ok && st == connectivity.Ready {
-			readySCs[sc] = SubConnInfo{Address: addr}
+	for addr, scInfo := range b.subConns {
+		if st, ok := b.scStates[scInfo.subConn]; ok && st == connectivity.Ready {
+			addr.Attributes = scInfo.attrs
+			readySCs[scInfo.subConn] = SubConnInfo{Address: addr}
 		}
 	}
 	b.picker = b.pickerBuilder.Build(PickerBuildInfo{ReadySCs: readySCs})
diff --git a/vendor/google.golang.org/grpc/balancer_conn_wrappers.go b/vendor/google.golang.org/grpc/balancer_conn_wrappers.go
index 11e592aab..4cc7f9159 100644
--- a/vendor/google.golang.org/grpc/balancer_conn_wrappers.go
+++ b/vendor/google.golang.org/grpc/balancer_conn_wrappers.go
@@ -163,6 +163,14 @@ func (ccb *ccBalancerWrapper) RemoveSubConn(sc balancer.SubConn) {
 	ccb.cc.removeAddrConn(acbw.getAddrConn(), errConnDrain)
 }
 
+func (ccb *ccBalancerWrapper) UpdateAddresses(sc balancer.SubConn, addrs []resolver.Address) {
+	acbw, ok := sc.(*acBalancerWrapper)
+	if !ok {
+		return
+	}
+	acbw.UpdateAddresses(addrs)
+}
+
 func (ccb *ccBalancerWrapper) UpdateState(s balancer.State) {
 	ccb.mu.Lock()
 	defer ccb.mu.Unlock()
@@ -197,7 +205,7 @@ func (acbw *acBalancerWrapper) UpdateAddresses(addrs []resolver.Address) {
 	acbw.mu.Lock()
 	defer acbw.mu.Unlock()
 	if len(addrs) <= 0 {
-		acbw.ac.tearDown(errConnDrain)
+		acbw.ac.cc.removeAddrConn(acbw.ac, errConnDrain)
 		return
 	}
 	if !acbw.ac.tryUpdateAddrs(addrs) {
@@ -212,7 +220,7 @@ func (acbw *acBalancerWrapper) UpdateAddresses(addrs []resolver.Address) {
 		acbw.ac.acbw = nil
 		acbw.ac.mu.Unlock()
 		acState := acbw.ac.getState()
-		acbw.ac.tearDown(errConnDrain)
+		acbw.ac.cc.removeAddrConn(acbw.ac, errConnDrain)
 
 		if acState == connectivity.Shutdown {
 			return
diff --git a/vendor/google.golang.org/grpc/binarylog/grpc_binarylog_v1/binarylog.pb.go b/vendor/google.golang.org/grpc/binarylog/grpc_binarylog_v1/binarylog.pb.go
index da0472967..ed75290cd 100644
--- a/vendor/google.golang.org/grpc/binarylog/grpc_binarylog_v1/binarylog.pb.go
+++ b/vendor/google.golang.org/grpc/binarylog/grpc_binarylog_v1/binarylog.pb.go
@@ -19,17 +19,17 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.3.0
+// 	protoc        v3.14.0
 // source: grpc/binlog/v1/binarylog.proto
 
 package grpc_binarylog_v1
 
 import (
 	proto "github.com/golang/protobuf/proto"
-	duration "github.com/golang/protobuf/ptypes/duration"
-	timestamp "github.com/golang/protobuf/ptypes/timestamp"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	durationpb "google.golang.org/protobuf/types/known/durationpb"
+	timestamppb "google.golang.org/protobuf/types/known/timestamppb"
 	reflect "reflect"
 	sync "sync"
 )
@@ -243,7 +243,7 @@ type GrpcLogEntry struct {
 	unknownFields protoimpl.UnknownFields
 
 	// The timestamp of the binary log message
-	Timestamp *timestamp.Timestamp `protobuf:"bytes,1,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
+	Timestamp *timestamppb.Timestamp `protobuf:"bytes,1,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
 	// Uniquely identifies a call. The value must not be 0 in order to disambiguate
 	// from an unset value.
 	// Each call may have several log entries, they will all have the same call_id.
@@ -308,7 +308,7 @@ func (*GrpcLogEntry) Descriptor() ([]byte, []int) {
 	return file_grpc_binlog_v1_binarylog_proto_rawDescGZIP(), []int{0}
 }
 
-func (x *GrpcLogEntry) GetTimestamp() *timestamp.Timestamp {
+func (x *GrpcLogEntry) GetTimestamp() *timestamppb.Timestamp {
 	if x != nil {
 		return x.Timestamp
 	}
@@ -439,7 +439,7 @@ type ClientHeader struct {
 	// <host> or <host>:<port> .
 	Authority string `protobuf:"bytes,3,opt,name=authority,proto3" json:"authority,omitempty"`
 	// the RPC timeout
-	Timeout *duration.Duration `protobuf:"bytes,4,opt,name=timeout,proto3" json:"timeout,omitempty"`
+	Timeout *durationpb.Duration `protobuf:"bytes,4,opt,name=timeout,proto3" json:"timeout,omitempty"`
 }
 
 func (x *ClientHeader) Reset() {
@@ -495,7 +495,7 @@ func (x *ClientHeader) GetAuthority() string {
 	return ""
 }
 
-func (x *ClientHeader) GetTimeout() *duration.Duration {
+func (x *ClientHeader) GetTimeout() *durationpb.Duration {
 	if x != nil {
 		return x.Timeout
 	}
@@ -1020,19 +1020,19 @@ func file_grpc_binlog_v1_binarylog_proto_rawDescGZIP() []byte {
 var file_grpc_binlog_v1_binarylog_proto_enumTypes = make([]protoimpl.EnumInfo, 3)
 var file_grpc_binlog_v1_binarylog_proto_msgTypes = make([]protoimpl.MessageInfo, 8)
 var file_grpc_binlog_v1_binarylog_proto_goTypes = []interface{}{
-	(GrpcLogEntry_EventType)(0), // 0: grpc.binarylog.v1.GrpcLogEntry.EventType
-	(GrpcLogEntry_Logger)(0),    // 1: grpc.binarylog.v1.GrpcLogEntry.Logger
-	(Address_Type)(0),           // 2: grpc.binarylog.v1.Address.Type
-	(*GrpcLogEntry)(nil),        // 3: grpc.binarylog.v1.GrpcLogEntry
-	(*ClientHeader)(nil),        // 4: grpc.binarylog.v1.ClientHeader
-	(*ServerHeader)(nil),        // 5: grpc.binarylog.v1.ServerHeader
-	(*Trailer)(nil),             // 6: grpc.binarylog.v1.Trailer
-	(*Message)(nil),             // 7: grpc.binarylog.v1.Message
-	(*Metadata)(nil),            // 8: grpc.binarylog.v1.Metadata
-	(*MetadataEntry)(nil),       // 9: grpc.binarylog.v1.MetadataEntry
-	(*Address)(nil),             // 10: grpc.binarylog.v1.Address
-	(*timestamp.Timestamp)(nil), // 11: google.protobuf.Timestamp
-	(*duration.Duration)(nil),   // 12: google.protobuf.Duration
+	(GrpcLogEntry_EventType)(0),   // 0: grpc.binarylog.v1.GrpcLogEntry.EventType
+	(GrpcLogEntry_Logger)(0),      // 1: grpc.binarylog.v1.GrpcLogEntry.Logger
+	(Address_Type)(0),             // 2: grpc.binarylog.v1.Address.Type
+	(*GrpcLogEntry)(nil),          // 3: grpc.binarylog.v1.GrpcLogEntry
+	(*ClientHeader)(nil),          // 4: grpc.binarylog.v1.ClientHeader
+	(*ServerHeader)(nil),          // 5: grpc.binarylog.v1.ServerHeader
+	(*Trailer)(nil),               // 6: grpc.binarylog.v1.Trailer
+	(*Message)(nil),               // 7: grpc.binarylog.v1.Message
+	(*Metadata)(nil),              // 8: grpc.binarylog.v1.Metadata
+	(*MetadataEntry)(nil),         // 9: grpc.binarylog.v1.MetadataEntry
+	(*Address)(nil),               // 10: grpc.binarylog.v1.Address
+	(*timestamppb.Timestamp)(nil), // 11: google.protobuf.Timestamp
+	(*durationpb.Duration)(nil),   // 12: google.protobuf.Duration
 }
 var file_grpc_binlog_v1_binarylog_proto_depIdxs = []int32{
 	11, // 0: grpc.binarylog.v1.GrpcLogEntry.timestamp:type_name -> google.protobuf.Timestamp
diff --git a/vendor/google.golang.org/grpc/clientconn.go b/vendor/google.golang.org/grpc/clientconn.go
index cbd671a85..24109264f 100644
--- a/vendor/google.golang.org/grpc/clientconn.go
+++ b/vendor/google.golang.org/grpc/clientconn.go
@@ -23,7 +23,6 @@ import (
 	"errors"
 	"fmt"
 	"math"
-	"net"
 	"reflect"
 	"strings"
 	"sync"
@@ -39,6 +38,7 @@ import (
 	"google.golang.org/grpc/internal/channelz"
 	"google.golang.org/grpc/internal/grpcsync"
 	"google.golang.org/grpc/internal/grpcutil"
+	iresolver "google.golang.org/grpc/internal/resolver"
 	"google.golang.org/grpc/internal/transport"
 	"google.golang.org/grpc/keepalive"
 	"google.golang.org/grpc/resolver"
@@ -48,6 +48,7 @@ import (
 	_ "google.golang.org/grpc/balancer/roundrobin"           // To register roundrobin.
 	_ "google.golang.org/grpc/internal/resolver/dns"         // To register dns resolver.
 	_ "google.golang.org/grpc/internal/resolver/passthrough" // To register passthrough resolver.
+	_ "google.golang.org/grpc/internal/resolver/unix"        // To register unix resolver.
 )
 
 const (
@@ -104,6 +105,17 @@ func Dial(target string, opts ...DialOption) (*ClientConn, error) {
 	return DialContext(context.Background(), target, opts...)
 }
 
+type defaultConfigSelector struct {
+	sc *ServiceConfig
+}
+
+func (dcs *defaultConfigSelector) SelectConfig(rpcInfo iresolver.RPCInfo) (*iresolver.RPCConfig, error) {
+	return &iresolver.RPCConfig{
+		Context:      rpcInfo.Context,
+		MethodConfig: getMethodConfig(dcs.sc, rpcInfo.Method),
+	}, nil
+}
+
 // DialContext creates a client connection to the given target. By default, it's
 // a non-blocking dial (the function won't wait for connections to be
 // established, and connecting happens in the background). To make it a blocking
@@ -131,6 +143,7 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 		firstResolveEvent: grpcsync.NewEvent(),
 	}
 	cc.retryThrottler.Store((*retryThrottler)(nil))
+	cc.safeConfigSelector.UpdateConfigSelector(&defaultConfigSelector{nil})
 	cc.ctx, cc.cancel = context.WithCancel(context.Background())
 
 	for _, opt := range opts {
@@ -191,16 +204,6 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 	}
 	cc.mkp = cc.dopts.copts.KeepaliveParams
 
-	if cc.dopts.copts.Dialer == nil {
-		cc.dopts.copts.Dialer = func(ctx context.Context, addr string) (net.Conn, error) {
-			network, addr := parseDialTarget(addr)
-			return (&net.Dialer{}).DialContext(ctx, network, addr)
-		}
-		if cc.dopts.withProxy {
-			cc.dopts.copts.Dialer = newProxyDialer(cc.dopts.copts.Dialer)
-		}
-	}
-
 	if cc.dopts.copts.UserAgent != "" {
 		cc.dopts.copts.UserAgent += " " + grpcUA
 	} else {
@@ -234,6 +237,7 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 		case sc, ok := <-cc.dopts.scChan:
 			if ok {
 				cc.sc = &sc
+				cc.safeConfigSelector.UpdateConfigSelector(&defaultConfigSelector{&sc})
 				scSet = true
 			}
 		default:
@@ -244,8 +248,7 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 	}
 
 	// Determine the resolver to use.
-	cc.parsedTarget = grpcutil.ParseTarget(cc.target)
-	unixScheme := strings.HasPrefix(cc.target, "unix:")
+	cc.parsedTarget = grpcutil.ParseTarget(cc.target, cc.dopts.copts.Dialer != nil)
 	channelz.Infof(logger, cc.channelzID, "parsed scheme: %q", cc.parsedTarget.Scheme)
 	resolverBuilder := cc.getResolver(cc.parsedTarget.Scheme)
 	if resolverBuilder == nil {
@@ -268,8 +271,10 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 		cc.authority = creds.Info().ServerName
 	} else if cc.dopts.insecure && cc.dopts.authority != "" {
 		cc.authority = cc.dopts.authority
-	} else if unixScheme {
+	} else if strings.HasPrefix(cc.target, "unix:") || strings.HasPrefix(cc.target, "unix-abstract:") {
 		cc.authority = "localhost"
+	} else if strings.HasPrefix(cc.parsedTarget.Endpoint, ":") {
+		cc.authority = "localhost" + cc.parsedTarget.Endpoint
 	} else {
 		// Use endpoint from "scheme://authority/endpoint" as the default
 		// authority for ClientConn.
@@ -282,6 +287,7 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 		case sc, ok := <-cc.dopts.scChan:
 			if ok {
 				cc.sc = &sc
+				cc.safeConfigSelector.UpdateConfigSelector(&defaultConfigSelector{&sc})
 			}
 		case <-ctx.Done():
 			return nil, ctx.Err()
@@ -299,6 +305,7 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 		DialCreds:        credsClone,
 		CredsBundle:      cc.dopts.copts.CredsBundle,
 		Dialer:           cc.dopts.copts.Dialer,
+		CustomUserAgent:  cc.dopts.copts.UserAgent,
 		ChannelzParentID: cc.channelzID,
 		Target:           cc.parsedTarget,
 	}
@@ -487,6 +494,8 @@ type ClientConn struct {
 	balancerBuildOpts balancer.BuildOptions
 	blockingpicker    *pickerWrapper
 
+	safeConfigSelector iresolver.SafeConfigSelector
+
 	mu              sync.RWMutex
 	resolverWrapper *ccResolverWrapper
 	sc              *ServiceConfig
@@ -547,6 +556,7 @@ func (cc *ClientConn) scWatcher() {
 			// TODO: load balance policy runtime change is ignored.
 			// We may revisit this decision in the future.
 			cc.sc = &sc
+			cc.safeConfigSelector.UpdateConfigSelector(&defaultConfigSelector{&sc})
 			cc.mu.Unlock()
 		case <-cc.ctx.Done():
 			return
@@ -585,13 +595,13 @@ func init() {
 
 func (cc *ClientConn) maybeApplyDefaultServiceConfig(addrs []resolver.Address) {
 	if cc.sc != nil {
-		cc.applyServiceConfigAndBalancer(cc.sc, addrs)
+		cc.applyServiceConfigAndBalancer(cc.sc, nil, addrs)
 		return
 	}
 	if cc.dopts.defaultServiceConfig != nil {
-		cc.applyServiceConfigAndBalancer(cc.dopts.defaultServiceConfig, addrs)
+		cc.applyServiceConfigAndBalancer(cc.dopts.defaultServiceConfig, &defaultConfigSelector{cc.dopts.defaultServiceConfig}, addrs)
 	} else {
-		cc.applyServiceConfigAndBalancer(emptyServiceConfig, addrs)
+		cc.applyServiceConfigAndBalancer(emptyServiceConfig, &defaultConfigSelector{emptyServiceConfig}, addrs)
 	}
 }
 
@@ -628,7 +638,15 @@ func (cc *ClientConn) updateResolverState(s resolver.State, err error) error {
 		// default, per the error handling design?
 	} else {
 		if sc, ok := s.ServiceConfig.Config.(*ServiceConfig); s.ServiceConfig.Err == nil && ok {
-			cc.applyServiceConfigAndBalancer(sc, s.Addresses)
+			configSelector := iresolver.GetConfigSelector(s)
+			if configSelector != nil {
+				if len(s.ServiceConfig.Config.(*ServiceConfig).Methods) != 0 {
+					channelz.Infof(logger, cc.channelzID, "method configs in service config will be ignored due to presence of config selector")
+				}
+			} else {
+				configSelector = &defaultConfigSelector{sc}
+			}
+			cc.applyServiceConfigAndBalancer(sc, configSelector, s.Addresses)
 		} else {
 			ret = balancer.ErrBadResolverState
 			if cc.balancerWrapper == nil {
@@ -638,6 +656,7 @@ func (cc *ClientConn) updateResolverState(s resolver.State, err error) error {
 				} else {
 					err = status.Errorf(codes.Unavailable, "illegal service config type: %T", s.ServiceConfig.Config)
 				}
+				cc.safeConfigSelector.UpdateConfigSelector(&defaultConfigSelector{cc.sc})
 				cc.blockingpicker.updatePicker(base.NewErrPicker(err))
 				cc.csMgr.updateState(connectivity.TransientFailure)
 				cc.mu.Unlock()
@@ -872,6 +891,20 @@ func (ac *addrConn) tryUpdateAddrs(addrs []resolver.Address) bool {
 	return curAddrFound
 }
 
+func getMethodConfig(sc *ServiceConfig, method string) MethodConfig {
+	if sc == nil {
+		return MethodConfig{}
+	}
+	if m, ok := sc.Methods[method]; ok {
+		return m
+	}
+	i := strings.LastIndex(method, "/")
+	if m, ok := sc.Methods[method[:i+1]]; ok {
+		return m
+	}
+	return sc.Methods[""]
+}
+
 // GetMethodConfig gets the method config of the input method.
 // If there's an exact match for input method (i.e. /service/method), we return
 // the corresponding MethodConfig.
@@ -884,17 +917,7 @@ func (cc *ClientConn) GetMethodConfig(method string) MethodConfig {
 	// TODO: Avoid the locking here.
 	cc.mu.RLock()
 	defer cc.mu.RUnlock()
-	if cc.sc == nil {
-		return MethodConfig{}
-	}
-	if m, ok := cc.sc.Methods[method]; ok {
-		return m
-	}
-	i := strings.LastIndex(method, "/")
-	if m, ok := cc.sc.Methods[method[:i+1]]; ok {
-		return m
-	}
-	return cc.sc.Methods[""]
+	return getMethodConfig(cc.sc, method)
 }
 
 func (cc *ClientConn) healthCheckConfig() *healthCheckConfig {
@@ -917,12 +940,15 @@ func (cc *ClientConn) getTransport(ctx context.Context, failfast bool, method st
 	return t, done, nil
 }
 
-func (cc *ClientConn) applyServiceConfigAndBalancer(sc *ServiceConfig, addrs []resolver.Address) {
+func (cc *ClientConn) applyServiceConfigAndBalancer(sc *ServiceConfig, configSelector iresolver.ConfigSelector, addrs []resolver.Address) {
 	if sc == nil {
 		// should never reach here.
 		return
 	}
 	cc.sc = sc
+	if configSelector != nil {
+		cc.safeConfigSelector.UpdateConfigSelector(configSelector)
+	}
 
 	if cc.sc.retryThrottling != nil {
 		newThrottler := &retryThrottler{
@@ -1172,7 +1198,7 @@ func (ac *addrConn) resetTransport() {
 		ac.mu.Lock()
 		if ac.state == connectivity.Shutdown {
 			ac.mu.Unlock()
-			newTr.Close()
+			newTr.Close(fmt.Errorf("reached connectivity state: SHUTDOWN"))
 			return
 		}
 		ac.curAddr = addr
@@ -1304,7 +1330,7 @@ func (ac *addrConn) createTransport(addr resolver.Address, copts transport.Conne
 	select {
 	case <-time.After(time.Until(connectDeadline)):
 		// We didn't get the preface in time.
-		newTr.Close()
+		newTr.Close(fmt.Errorf("failed to receive server preface within timeout"))
 		channelz.Warningf(logger, ac.channelzID, "grpc: addrConn.createTransport failed to connect to %v: didn't receive server preface in time. Reconnecting...", addr)
 		return nil, nil, errors.New("timed out waiting for server handshake")
 	case <-prefaceReceived:
@@ -1421,10 +1447,9 @@ func (ac *addrConn) getReadyTransport() (transport.ClientTransport, bool) {
 }
 
 // tearDown starts to tear down the addrConn.
-// TODO(zhaoq): Make this synchronous to avoid unbounded memory consumption in
-// some edge cases (e.g., the caller opens and closes many addrConn's in a
-// tight loop.
-// tearDown doesn't remove ac from ac.cc.conns.
+//
+// Note that tearDown doesn't remove ac from ac.cc.conns, so the addrConn struct
+// will leak. In most cases, call cc.removeAddrConn() instead.
 func (ac *addrConn) tearDown(err error) {
 	ac.mu.Lock()
 	if ac.state == connectivity.Shutdown {
diff --git a/vendor/google.golang.org/grpc/credentials/credentials.go b/vendor/google.golang.org/grpc/credentials/credentials.go
index 02766443a..7eee7e4ec 100644
--- a/vendor/google.golang.org/grpc/credentials/credentials.go
+++ b/vendor/google.golang.org/grpc/credentials/credentials.go
@@ -30,7 +30,7 @@ import (
 
 	"github.com/golang/protobuf/proto"
 	"google.golang.org/grpc/attributes"
-	"google.golang.org/grpc/internal"
+	icredentials "google.golang.org/grpc/internal/credentials"
 )
 
 // PerRPCCredentials defines the common interface for the credentials which need to
@@ -58,9 +58,9 @@ type PerRPCCredentials interface {
 type SecurityLevel int
 
 const (
-	// Invalid indicates an invalid security level.
+	// InvalidSecurityLevel indicates an invalid security level.
 	// The zero SecurityLevel value is invalid for backward compatibility.
-	Invalid SecurityLevel = iota
+	InvalidSecurityLevel SecurityLevel = iota
 	// NoSecurity indicates a connection is insecure.
 	NoSecurity
 	// IntegrityOnly indicates a connection only provides integrity protection.
@@ -92,7 +92,7 @@ type CommonAuthInfo struct {
 }
 
 // GetCommonAuthInfo returns the pointer to CommonAuthInfo struct.
-func (c *CommonAuthInfo) GetCommonAuthInfo() *CommonAuthInfo {
+func (c CommonAuthInfo) GetCommonAuthInfo() CommonAuthInfo {
 	return c
 }
 
@@ -188,15 +188,12 @@ type RequestInfo struct {
 	AuthInfo AuthInfo
 }
 
-// requestInfoKey is a struct to be used as the key when attaching a RequestInfo to a context object.
-type requestInfoKey struct{}
-
 // RequestInfoFromContext extracts the RequestInfo from the context if it exists.
 //
 // This API is experimental.
 func RequestInfoFromContext(ctx context.Context) (ri RequestInfo, ok bool) {
-	ri, ok = ctx.Value(requestInfoKey{}).(RequestInfo)
-	return
+	ri, ok = icredentials.RequestInfoFromContext(ctx).(RequestInfo)
+	return ri, ok
 }
 
 // ClientHandshakeInfo holds data to be passed to ClientHandshake. This makes
@@ -211,16 +208,12 @@ type ClientHandshakeInfo struct {
 	Attributes *attributes.Attributes
 }
 
-// clientHandshakeInfoKey is a struct used as the key to store
-// ClientHandshakeInfo in a context.
-type clientHandshakeInfoKey struct{}
-
 // ClientHandshakeInfoFromContext returns the ClientHandshakeInfo struct stored
 // in ctx.
 //
 // This API is experimental.
 func ClientHandshakeInfoFromContext(ctx context.Context) ClientHandshakeInfo {
-	chi, _ := ctx.Value(clientHandshakeInfoKey{}).(ClientHandshakeInfo)
+	chi, _ := icredentials.ClientHandshakeInfoFromContext(ctx).(ClientHandshakeInfo)
 	return chi
 }
 
@@ -229,17 +222,16 @@ func ClientHandshakeInfoFromContext(ctx context.Context) ClientHandshakeInfo {
 // or 3) CommonAuthInfo.SecurityLevel has an invalid zero value. For 2) and 3), it is for the purpose of backward-compatibility.
 //
 // This API is experimental.
-func CheckSecurityLevel(ctx context.Context, level SecurityLevel) error {
+func CheckSecurityLevel(ai AuthInfo, level SecurityLevel) error {
 	type internalInfo interface {
-		GetCommonAuthInfo() *CommonAuthInfo
+		GetCommonAuthInfo() CommonAuthInfo
 	}
-	ri, _ := RequestInfoFromContext(ctx)
-	if ri.AuthInfo == nil {
-		return errors.New("unable to obtain SecurityLevel from context")
+	if ai == nil {
+		return errors.New("AuthInfo is nil")
 	}
-	if ci, ok := ri.AuthInfo.(internalInfo); ok {
+	if ci, ok := ai.(internalInfo); ok {
 		// CommonAuthInfo.SecurityLevel has an invalid value.
-		if ci.GetCommonAuthInfo().SecurityLevel == Invalid {
+		if ci.GetCommonAuthInfo().SecurityLevel == InvalidSecurityLevel {
 			return nil
 		}
 		if ci.GetCommonAuthInfo().SecurityLevel < level {
@@ -250,15 +242,6 @@ func CheckSecurityLevel(ctx context.Context, level SecurityLevel) error {
 	return nil
 }
 
-func init() {
-	internal.NewRequestInfoContext = func(ctx context.Context, ri RequestInfo) context.Context {
-		return context.WithValue(ctx, requestInfoKey{}, ri)
-	}
-	internal.NewClientHandshakeInfoContext = func(ctx context.Context, chi ClientHandshakeInfo) context.Context {
-		return context.WithValue(ctx, clientHandshakeInfoKey{}, chi)
-	}
-}
-
 // ChannelzSecurityInfo defines the interface that security protocols should implement
 // in order to provide security info to channelz.
 //
diff --git a/vendor/google.golang.org/grpc/dialoptions.go b/vendor/google.golang.org/grpc/dialoptions.go
index a93fcab8f..7a497237b 100644
--- a/vendor/google.golang.org/grpc/dialoptions.go
+++ b/vendor/google.golang.org/grpc/dialoptions.go
@@ -66,12 +66,7 @@ type dialOptions struct {
 	minConnectTimeout           func() time.Duration
 	defaultServiceConfig        *ServiceConfig // defaultServiceConfig is parsed from defaultServiceConfigRawJSON.
 	defaultServiceConfigRawJSON *string
-	// This is used by ccResolverWrapper to backoff between successive calls to
-	// resolver.ResolveNow(). The user will have no need to configure this, but
-	// we need to be able to configure this in tests.
-	resolveNowBackoff func(int) time.Duration
-	resolvers         []resolver.Builder
-	withProxy         bool
+	resolvers                   []resolver.Builder
 }
 
 // DialOption configures how we set up the connection.
@@ -325,7 +320,7 @@ func WithInsecure() DialOption {
 // later release.
 func WithNoProxy() DialOption {
 	return newFuncDialOption(func(o *dialOptions) {
-		o.withProxy = false
+		o.copts.UseProxy = false
 	})
 }
 
@@ -595,9 +590,8 @@ func defaultDialOptions() dialOptions {
 		copts: transport.ConnectOptions{
 			WriteBufferSize: defaultWriteBufSize,
 			ReadBufferSize:  defaultReadBufSize,
+			UseProxy:        true,
 		},
-		resolveNowBackoff: internalbackoff.DefaultExponential.Backoff,
-		withProxy:         true,
 	}
 }
 
@@ -612,16 +606,6 @@ func withMinConnectDeadline(f func() time.Duration) DialOption {
 	})
 }
 
-// withResolveNowBackoff specifies the function that clientconn uses to backoff
-// between successive calls to resolver.ResolveNow().
-//
-// For testing purpose only.
-func withResolveNowBackoff(f func(int) time.Duration) DialOption {
-	return newFuncDialOption(func(o *dialOptions) {
-		o.resolveNowBackoff = f
-	})
-}
-
 // WithResolvers allows a list of resolver implementations to be registered
 // locally with the ClientConn without needing to be globally registered via
 // resolver.Register.  They will be matched against the scheme used for the
diff --git a/vendor/google.golang.org/grpc/encoding/proto/proto.go b/vendor/google.golang.org/grpc/encoding/proto/proto.go
index 66b97a6f6..3009b35af 100644
--- a/vendor/google.golang.org/grpc/encoding/proto/proto.go
+++ b/vendor/google.golang.org/grpc/encoding/proto/proto.go
@@ -21,8 +21,7 @@
 package proto
 
 import (
-	"math"
-	"sync"
+	"fmt"
 
 	"github.com/golang/protobuf/proto"
 	"google.golang.org/grpc/encoding"
@@ -38,73 +37,22 @@ func init() {
 // codec is a Codec implementation with protobuf. It is the default codec for gRPC.
 type codec struct{}
 
-type cachedProtoBuffer struct {
-	lastMarshaledSize uint32
-	proto.Buffer
-}
-
-func capToMaxInt32(val int) uint32 {
-	if val > math.MaxInt32 {
-		return uint32(math.MaxInt32)
-	}
-	return uint32(val)
-}
-
-func marshal(v interface{}, cb *cachedProtoBuffer) ([]byte, error) {
-	protoMsg := v.(proto.Message)
-	newSlice := make([]byte, 0, cb.lastMarshaledSize)
-
-	cb.SetBuf(newSlice)
-	cb.Reset()
-	if err := cb.Marshal(protoMsg); err != nil {
-		return nil, err
-	}
-	out := cb.Bytes()
-	cb.lastMarshaledSize = capToMaxInt32(len(out))
-	return out, nil
-}
-
 func (codec) Marshal(v interface{}) ([]byte, error) {
-	if pm, ok := v.(proto.Marshaler); ok {
-		// object can marshal itself, no need for buffer
-		return pm.Marshal()
+	vv, ok := v.(proto.Message)
+	if !ok {
+		return nil, fmt.Errorf("failed to marshal, message is %T, want proto.Message", v)
 	}
-
-	cb := protoBufferPool.Get().(*cachedProtoBuffer)
-	out, err := marshal(v, cb)
-
-	// put back buffer and lose the ref to the slice
-	cb.SetBuf(nil)
-	protoBufferPool.Put(cb)
-	return out, err
+	return proto.Marshal(vv)
 }
 
 func (codec) Unmarshal(data []byte, v interface{}) error {
-	protoMsg := v.(proto.Message)
-	protoMsg.Reset()
-
-	if pu, ok := protoMsg.(proto.Unmarshaler); ok {
-		// object can unmarshal itself, no need for buffer
-		return pu.Unmarshal(data)
+	vv, ok := v.(proto.Message)
+	if !ok {
+		return fmt.Errorf("failed to unmarshal, message is %T, want proto.Message", v)
 	}
-
-	cb := protoBufferPool.Get().(*cachedProtoBuffer)
-	cb.SetBuf(data)
-	err := cb.Unmarshal(protoMsg)
-	cb.SetBuf(nil)
-	protoBufferPool.Put(cb)
-	return err
+	return proto.Unmarshal(data, vv)
 }
 
 func (codec) Name() string {
 	return Name
 }
-
-var protoBufferPool = &sync.Pool{
-	New: func() interface{} {
-		return &cachedProtoBuffer{
-			Buffer:            proto.Buffer{},
-			lastMarshaledSize: 16,
-		}
-	},
-}
diff --git a/vendor/google.golang.org/grpc/go.mod b/vendor/google.golang.org/grpc/go.mod
index d97276556..b177cfa66 100644
--- a/vendor/google.golang.org/grpc/go.mod
+++ b/vendor/google.golang.org/grpc/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 v0.0.0-20201120205902-5459f2c99403
+	github.com/envoyproxy/go-control-plane v0.9.9-0.20210217033140-668b12f5399d
 	github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
-	github.com/golang/protobuf v1.4.1
+	github.com/golang/protobuf v1.4.2
 	github.com/google/go-cmp v0.5.0
 	github.com/google/uuid v1.1.2
 	golang.org/x/net v0.0.0-20190311183353-d8887717615a
diff --git a/vendor/google.golang.org/grpc/go.sum b/vendor/google.golang.org/grpc/go.sum
index 356a82e3d..24d2976ab 100644
--- a/vendor/google.golang.org/grpc/go.sum
+++ b/vendor/google.golang.org/grpc/go.sum
@@ -1,14 +1,17 @@
 cloud.google.com/go v0.26.0 h1:e0WKqKTd5BnrG8aKH3J3h+QvEIQtSUcf2n5UZ5ZgLtQ=
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+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/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
-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=
+github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403 h1:cqQfy1jclcSy/FwLjemeg3SR1yaINm74aQyupQ0Bl8M=
+github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
-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 v0.9.9-0.20210217033140-668b12f5399d h1:QyzYnTnPE15SQyUeqU6qLbWxMkwyAyu+vGksa0b7j00=
+github.com/envoyproxy/go-control-plane v0.9.9-0.20210217033140-668b12f5399d/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk=
 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/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
@@ -21,18 +24,23 @@ github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:x
 github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrUpVNzEA03Pprs=
 github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w=
 github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
-github.com/golang/protobuf v1.4.1 h1:ZFgWrT+bLgsYPirOnRfKLYJLvssAegOj/hgyMFdJZe0=
 github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QDs8UjoX8=
+github.com/golang/protobuf v1.4.2 h1:+Z5KGCizgyZCbGh1KZqA0fcLLkwbsjIzS4aV2v7wJX0=
+github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/google/go-cmp v0.4.0 h1:xsAVV57WRhGj6kEIi8ReJzQlHHqcBYCElAvkovg3B/4=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.0 h1:/QaMHBdZ26BB3SSst0Iwl10Epc+xhTquomWX0oZEB6w=
 github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/uuid v1.1.2 h1:EVhdT+1Kseyi1/pUmXKaFxYsDNy9RQYkMWRH68J/W7Y=
 github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
+github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
@@ -63,7 +71,6 @@ google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9Ywl
 google.golang.org/appengine v1.4.0 h1:/wp5JvzpHIxhs/dumFmF7BXTf3Z+dd4uXta4kVyO508=
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
-google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55 h1:gSJIx1SDwno+2ElGhA4+qG2zF97qiUzTM+rQ0klBOcE=
 google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
 google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013 h1:+kGHl1aib/qcwaRi1CbqBZ1rk19r85MNUf8HaBghugY=
 google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEYHJ7i3ixzK3sjbqSGDJWnxyFXZblF3eUsNvo=
@@ -77,8 +84,13 @@ google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQ
 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 v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.25.0 h1:Ejskq+SyPohKW+1uil0JJMtmHCgJPJ/qWTxr8qp+R4c=
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+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/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
diff --git a/vendor/google.golang.org/grpc/interceptor.go b/vendor/google.golang.org/grpc/interceptor.go
index d1a609e48..668e0adcf 100644
--- a/vendor/google.golang.org/grpc/interceptor.go
+++ b/vendor/google.golang.org/grpc/interceptor.go
@@ -25,25 +25,41 @@ import (
 // UnaryInvoker is called by UnaryClientInterceptor to complete RPCs.
 type UnaryInvoker func(ctx context.Context, method string, req, reply interface{}, cc *ClientConn, opts ...CallOption) error
 
-// UnaryClientInterceptor intercepts the execution of a unary RPC on the client. invoker is the handler to complete the RPC
-// and it is the responsibility of the interceptor to call it.
+// UnaryClientInterceptor intercepts the execution of a unary RPC on the client.
+// Unary interceptors can be specified as a DialOption, using
+// WithUnaryInterceptor() or WithChainUnaryInterceptor(), when creating a
+// ClientConn. When a unary interceptor(s) is set on a ClientConn, gRPC
+// delegates all unary RPC invocations to the interceptor, and it is the
+// responsibility of the interceptor to call invoker to complete the processing
+// of the RPC.
 //
-// Experimental
+// method is the RPC name. req and reply are the corresponding request and
+// response messages. cc is the ClientConn on which the RPC was invoked. invoker
+// is the handler to complete the RPC and it is the responsibility of the
+// interceptor to call it. opts contain all applicable call options, including
+// defaults from the ClientConn as well as per-call options.
 //
-// Notice: This type is EXPERIMENTAL and may be changed or removed in a
-// later release.
+// The returned error must be compatible with the status package.
 type UnaryClientInterceptor func(ctx context.Context, method string, req, reply interface{}, cc *ClientConn, invoker UnaryInvoker, opts ...CallOption) error
 
 // Streamer is called by StreamClientInterceptor to create a ClientStream.
 type Streamer func(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, opts ...CallOption) (ClientStream, error)
 
-// StreamClientInterceptor intercepts the creation of ClientStream. It may return a custom ClientStream to intercept all I/O
-// operations. streamer is the handler to create a ClientStream and it is the responsibility of the interceptor to call it.
+// StreamClientInterceptor intercepts the creation of a ClientStream. Stream
+// interceptors can be specified as a DialOption, using WithStreamInterceptor()
+// or WithChainStreamInterceptor(), when creating a ClientConn. When a stream
+// interceptor(s) is set on the ClientConn, gRPC delegates all stream creations
+// to the interceptor, and it is the responsibility of the interceptor to call
+// streamer.
 //
-// Experimental
+// desc contains a description of the stream. cc is the ClientConn on which the
+// RPC was invoked. streamer is the handler to create a ClientStream and it is
+// the responsibility of the interceptor to call it. opts contain all applicable
+// call options, including defaults from the ClientConn as well as per-call
+// options.
 //
-// Notice: This type is EXPERIMENTAL and may be changed or removed in a
-// later release.
+// StreamClientInterceptor may return a custom ClientStream to intercept all I/O
+// operations. The returned error must be compatible with the status package.
 type StreamClientInterceptor func(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, streamer Streamer, opts ...CallOption) (ClientStream, error)
 
 // UnaryServerInfo consists of various information about a unary RPC on
diff --git a/vendor/google.golang.org/grpc/internal/credentials/credentials.go b/vendor/google.golang.org/grpc/internal/credentials/credentials.go
new file mode 100644
index 000000000..32c9b5903
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/credentials/credentials.go
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2021 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 credentials
+
+import (
+	"context"
+)
+
+// requestInfoKey is a struct to be used as the key to store RequestInfo in a
+// context.
+type requestInfoKey struct{}
+
+// NewRequestInfoContext creates a context with ri.
+func NewRequestInfoContext(ctx context.Context, ri interface{}) context.Context {
+	return context.WithValue(ctx, requestInfoKey{}, ri)
+}
+
+// RequestInfoFromContext extracts the RequestInfo from ctx.
+func RequestInfoFromContext(ctx context.Context) interface{} {
+	return ctx.Value(requestInfoKey{})
+}
+
+// clientHandshakeInfoKey is a struct used as the key to store
+// ClientHandshakeInfo in a context.
+type clientHandshakeInfoKey struct{}
+
+// ClientHandshakeInfoFromContext extracts the ClientHandshakeInfo from ctx.
+func ClientHandshakeInfoFromContext(ctx context.Context) interface{} {
+	return ctx.Value(clientHandshakeInfoKey{})
+}
+
+// NewClientHandshakeInfoContext creates a context with chi.
+func NewClientHandshakeInfoContext(ctx context.Context, chi interface{}) context.Context {
+	return context.WithValue(ctx, clientHandshakeInfoKey{}, chi)
+}
diff --git a/vendor/google.golang.org/grpc/internal/grpcutil/target.go b/vendor/google.golang.org/grpc/internal/grpcutil/target.go
index 80b33cdaf..8833021da 100644
--- a/vendor/google.golang.org/grpc/internal/grpcutil/target.go
+++ b/vendor/google.golang.org/grpc/internal/grpcutil/target.go
@@ -37,19 +37,53 @@ func split2(s, sep string) (string, string, bool) {
 }
 
 // ParseTarget splits target into a resolver.Target struct containing scheme,
-// authority and endpoint.
+// authority and endpoint. skipUnixColonParsing indicates that the parse should
+// not parse "unix:[path]" cases. This should be true in cases where a custom
+// dialer is present, to prevent a behavior change.
 //
-// If target is not a valid scheme://authority/endpoint, it returns {Endpoint:
-// target}.
-func ParseTarget(target string) (ret resolver.Target) {
+// If target is not a valid scheme://authority/endpoint as specified in
+// https://github.com/grpc/grpc/blob/master/doc/naming.md,
+// it returns {Endpoint: target}.
+func ParseTarget(target string, skipUnixColonParsing bool) (ret resolver.Target) {
 	var ok bool
+	if strings.HasPrefix(target, "unix-abstract:") {
+		if strings.HasPrefix(target, "unix-abstract://") {
+			// Maybe, with Authority specified, try to parse it
+			var remain string
+			ret.Scheme, remain, _ = split2(target, "://")
+			ret.Authority, ret.Endpoint, ok = split2(remain, "/")
+			if !ok {
+				// No Authority, add the "//" back
+				ret.Endpoint = "//" + remain
+			} else {
+				// Found Authority, add the "/" back
+				ret.Endpoint = "/" + ret.Endpoint
+			}
+		} else {
+			// Without Authority specified, split target on ":"
+			ret.Scheme, ret.Endpoint, _ = split2(target, ":")
+		}
+		return ret
+	}
 	ret.Scheme, ret.Endpoint, ok = split2(target, "://")
 	if !ok {
+		if strings.HasPrefix(target, "unix:") && !skipUnixColonParsing {
+			// Handle the "unix:[local/path]" and "unix:[/absolute/path]" cases,
+			// because splitting on :// only handles the
+			// "unix://[/absolute/path]" case. Only handle if the dialer is nil,
+			// to avoid a behavior change with custom dialers.
+			return resolver.Target{Scheme: "unix", Endpoint: target[len("unix:"):]}
+		}
 		return resolver.Target{Endpoint: target}
 	}
 	ret.Authority, ret.Endpoint, ok = split2(ret.Endpoint, "/")
 	if !ok {
 		return resolver.Target{Endpoint: target}
 	}
+	if ret.Scheme == "unix" {
+		// Add the "/" back in the unix case, so the unix resolver receives the
+		// actual endpoint in the "unix://[/absolute/path]" case.
+		ret.Endpoint = "/" + ret.Endpoint
+	}
 	return ret
 }
diff --git a/vendor/google.golang.org/grpc/internal/internal.go b/vendor/google.golang.org/grpc/internal/internal.go
index 716d92800..1b596bf35 100644
--- a/vendor/google.golang.org/grpc/internal/internal.go
+++ b/vendor/google.golang.org/grpc/internal/internal.go
@@ -38,12 +38,6 @@ var (
 	// KeepaliveMinPingTime is the minimum ping interval.  This must be 10s by
 	// default, but tests may wish to set it lower for convenience.
 	KeepaliveMinPingTime = 10 * time.Second
-	// NewRequestInfoContext creates a new context based on the argument context attaching
-	// the passed in RequestInfo to the new context.
-	NewRequestInfoContext interface{} // func(context.Context, credentials.RequestInfo) context.Context
-	// NewClientHandshakeInfoContext returns a copy of the input context with
-	// the passed in ClientHandshakeInfo struct added to it.
-	NewClientHandshakeInfoContext interface{} // func(context.Context, credentials.ClientHandshakeInfo) context.Context
 	// ParseServiceConfigForTesting is for creating a fake
 	// ClientConn for resolver testing only
 	ParseServiceConfigForTesting interface{} // func(string) *serviceconfig.ParseResult
@@ -57,6 +51,19 @@ var (
 	// bootstrap code while parsing certificate provider configs in the
 	// bootstrap file.
 	GetCertificateProviderBuilder interface{} // func(string) certprovider.Builder
+	// GetXDSHandshakeInfoForTesting returns a pointer to the xds.HandshakeInfo
+	// stored in the passed in attributes. This is set by
+	// credentials/xds/xds.go.
+	GetXDSHandshakeInfoForTesting interface{} // func (*attributes.Attributes) *xds.HandshakeInfo
+	// GetServerCredentials returns the transport credentials configured on a
+	// gRPC server. An xDS-enabled server needs to know what type of credentials
+	// is configured on the underlying gRPC server. This is set by server.go.
+	GetServerCredentials interface{} // func (*grpc.Server) credentials.TransportCredentials
+	// DrainServerTransports initiates a graceful close of existing connections
+	// on a gRPC server accepted on the provided listener address. An
+	// xDS-enabled server invokes this method on a grpc.Server when a particular
+	// listener moves to "not-serving" mode.
+	DrainServerTransports interface{} // func(*grpc.Server, string)
 )
 
 // HealthChecker defines the signature of the client-side LB channel health checking function.
diff --git a/vendor/google.golang.org/grpc/internal/metadata/metadata.go b/vendor/google.golang.org/grpc/internal/metadata/metadata.go
new file mode 100644
index 000000000..302262613
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/metadata/metadata.go
@@ -0,0 +1,50 @@
+/*
+ *
+ * Copyright 2020 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 metadata contains functions to set and get metadata from addresses.
+//
+// This package is experimental.
+package metadata
+
+import (
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/resolver"
+)
+
+type mdKeyType string
+
+const mdKey = mdKeyType("grpc.internal.address.metadata")
+
+// Get returns the metadata of addr.
+func Get(addr resolver.Address) metadata.MD {
+	attrs := addr.Attributes
+	if attrs == nil {
+		return nil
+	}
+	md, _ := attrs.Value(mdKey).(metadata.MD)
+	return md
+}
+
+// Set sets (overrides) the metadata in addr.
+//
+// When a SubConn is created with this address, the RPCs sent on it will all
+// have this metadata.
+func Set(addr resolver.Address, md metadata.MD) resolver.Address {
+	addr.Attributes = addr.Attributes.WithValues(mdKey, md)
+	return addr
+}
diff --git a/vendor/google.golang.org/grpc/internal/resolver/config_selector.go b/vendor/google.golang.org/grpc/internal/resolver/config_selector.go
new file mode 100644
index 000000000..5e7f36703
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/resolver/config_selector.go
@@ -0,0 +1,164 @@
+/*
+ *
+ * Copyright 2020 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 resolver provides internal resolver-related functionality.
+package resolver
+
+import (
+	"context"
+	"sync"
+
+	"google.golang.org/grpc/internal/serviceconfig"
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/resolver"
+)
+
+// ConfigSelector controls what configuration to use for every RPC.
+type ConfigSelector interface {
+	// Selects the configuration for the RPC, or terminates it using the error.
+	// This error will be converted by the gRPC library to a status error with
+	// code UNKNOWN if it is not returned as a status error.
+	SelectConfig(RPCInfo) (*RPCConfig, error)
+}
+
+// RPCInfo contains RPC information needed by a ConfigSelector.
+type RPCInfo struct {
+	// Context is the user's context for the RPC and contains headers and
+	// application timeout.  It is passed for interception purposes and for
+	// efficiency reasons.  SelectConfig should not be blocking.
+	Context context.Context
+	Method  string // i.e. "/Service/Method"
+}
+
+// RPCConfig describes the configuration to use for each RPC.
+type RPCConfig struct {
+	// The context to use for the remainder of the RPC; can pass info to LB
+	// policy or affect timeout or metadata.
+	Context      context.Context
+	MethodConfig serviceconfig.MethodConfig // configuration to use for this RPC
+	OnCommitted  func()                     // Called when the RPC has been committed (retries no longer possible)
+	Interceptor  ClientInterceptor
+}
+
+// ClientStream is the same as grpc.ClientStream, but defined here for circular
+// dependency reasons.
+type ClientStream interface {
+	// 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, if there is any.
+	// It must only be called after stream.CloseAndRecv has returned, or
+	// stream.Recv has returned a non-nil error (including io.EOF).
+	Trailer() metadata.MD
+	// CloseSend closes the send direction of the stream. It closes the stream
+	// when non-nil error is met. It is also not safe to call CloseSend
+	// concurrently with SendMsg.
+	CloseSend() error
+	// Context returns the context for this stream.
+	//
+	// It should not be called until after Header or RecvMsg has returned. Once
+	// called, subsequent client-side retries are disabled.
+	Context() context.Context
+	// SendMsg is generally called by generated code. On error, SendMsg aborts
+	// the stream. If the error was generated by the client, the status is
+	// returned directly; otherwise, io.EOF is returned and the status of
+	// the stream may be discovered using RecvMsg.
+	//
+	// SendMsg blocks until:
+	//   - There is sufficient flow control to schedule m with the transport, or
+	//   - The stream is done, or
+	//   - The stream breaks.
+	//
+	// SendMsg does not wait until the message is received by the server. An
+	// untimely stream closure may result in lost messages. To ensure delivery,
+	// users should ensure the RPC completed successfully using RecvMsg.
+	//
+	// It is safe to have a goroutine calling SendMsg and another goroutine
+	// calling RecvMsg on the same stream at the same time, but it is not safe
+	// to call SendMsg on the same stream in different goroutines. It is also
+	// not safe to call CloseSend concurrently with SendMsg.
+	SendMsg(m interface{}) error
+	// RecvMsg blocks until it receives a message into m or the stream is
+	// done. It returns io.EOF when the stream completes successfully. On
+	// any other error, the stream is aborted and the error contains the RPC
+	// status.
+	//
+	// It is safe to have a goroutine calling SendMsg and another goroutine
+	// calling RecvMsg on the same stream at the same time, but it is not
+	// safe to call RecvMsg on the same stream in different goroutines.
+	RecvMsg(m interface{}) error
+}
+
+// ClientInterceptor is an interceptor for gRPC client streams.
+type ClientInterceptor interface {
+	// NewStream produces a ClientStream for an RPC which may optionally use
+	// the provided function to produce a stream for delegation.  Note:
+	// RPCInfo.Context should not be used (will be nil).
+	//
+	// done is invoked when the RPC is finished using its connection, or could
+	// not be assigned a connection.  RPC operations may still occur on
+	// ClientStream after done is called, since the interceptor is invoked by
+	// application-layer operations.  done must never be nil when called.
+	NewStream(ctx context.Context, ri RPCInfo, done func(), newStream func(ctx context.Context, done func()) (ClientStream, error)) (ClientStream, error)
+}
+
+// ServerInterceptor is unimplementable; do not use.
+type ServerInterceptor interface {
+	notDefined()
+}
+
+type csKeyType string
+
+const csKey = csKeyType("grpc.internal.resolver.configSelector")
+
+// SetConfigSelector sets the config selector in state and returns the new
+// state.
+func SetConfigSelector(state resolver.State, cs ConfigSelector) resolver.State {
+	state.Attributes = state.Attributes.WithValues(csKey, cs)
+	return state
+}
+
+// GetConfigSelector retrieves the config selector from state, if present, and
+// returns it or nil if absent.
+func GetConfigSelector(state resolver.State) ConfigSelector {
+	cs, _ := state.Attributes.Value(csKey).(ConfigSelector)
+	return cs
+}
+
+// SafeConfigSelector allows for safe switching of ConfigSelector
+// implementations such that previous values are guaranteed to not be in use
+// when UpdateConfigSelector returns.
+type SafeConfigSelector struct {
+	mu sync.RWMutex
+	cs ConfigSelector
+}
+
+// UpdateConfigSelector swaps to the provided ConfigSelector and blocks until
+// all uses of the previous ConfigSelector have completed.
+func (scs *SafeConfigSelector) UpdateConfigSelector(cs ConfigSelector) {
+	scs.mu.Lock()
+	defer scs.mu.Unlock()
+	scs.cs = cs
+}
+
+// SelectConfig defers to the current ConfigSelector in scs.
+func (scs *SafeConfigSelector) SelectConfig(r RPCInfo) (*RPCConfig, error) {
+	scs.mu.RLock()
+	defer scs.mu.RUnlock()
+	return scs.cs.SelectConfig(r)
+}
diff --git a/vendor/google.golang.org/grpc/internal/resolver/dns/dns_resolver.go b/vendor/google.golang.org/grpc/internal/resolver/dns/dns_resolver.go
index 304235566..03825bbe7 100644
--- a/vendor/google.golang.org/grpc/internal/resolver/dns/dns_resolver.go
+++ b/vendor/google.golang.org/grpc/internal/resolver/dns/dns_resolver.go
@@ -34,6 +34,7 @@ import (
 
 	grpclbstate "google.golang.org/grpc/balancer/grpclb/state"
 	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/internal/backoff"
 	"google.golang.org/grpc/internal/envconfig"
 	"google.golang.org/grpc/internal/grpcrand"
 	"google.golang.org/grpc/resolver"
@@ -46,6 +47,13 @@ var EnableSRVLookups = false
 
 var logger = grpclog.Component("dns")
 
+// Globals to stub out in tests. TODO: Perhaps these two can be combined into a
+// single variable for testing the resolver?
+var (
+	newTimer           = time.NewTimer
+	newTimerDNSResRate = time.NewTimer
+)
+
 func init() {
 	resolver.Register(NewBuilder())
 }
@@ -143,7 +151,6 @@ func (b *dnsBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts
 
 	d.wg.Add(1)
 	go d.watcher()
-	d.ResolveNow(resolver.ResolveNowOptions{})
 	return d, nil
 }
 
@@ -201,28 +208,38 @@ func (d *dnsResolver) Close() {
 
 func (d *dnsResolver) watcher() {
 	defer d.wg.Done()
+	backoffIndex := 1
 	for {
-		select {
-		case <-d.ctx.Done():
-			return
-		case <-d.rn:
-		}
-
 		state, err := d.lookup()
 		if err != nil {
+			// Report error to the underlying grpc.ClientConn.
 			d.cc.ReportError(err)
 		} else {
-			d.cc.UpdateState(*state)
+			err = d.cc.UpdateState(*state)
 		}
 
-		// Sleep to prevent excessive re-resolutions. Incoming resolution requests
-		// will be queued in d.rn.
-		t := time.NewTimer(minDNSResRate)
+		var timer *time.Timer
+		if err == nil {
+			// Success resolving, wait for the next ResolveNow. However, also wait 30 seconds at the very least
+			// to prevent constantly re-resolving.
+			backoffIndex = 1
+			timer = newTimerDNSResRate(minDNSResRate)
+			select {
+			case <-d.ctx.Done():
+				timer.Stop()
+				return
+			case <-d.rn:
+			}
+		} else {
+			// Poll on an error found in DNS Resolver or an error received from ClientConn.
+			timer = newTimer(backoff.DefaultExponential.Backoff(backoffIndex))
+			backoffIndex++
+		}
 		select {
-		case <-t.C:
 		case <-d.ctx.Done():
-			t.Stop()
+			timer.Stop()
 			return
+		case <-timer.C:
 		}
 	}
 }
diff --git a/vendor/google.golang.org/grpc/internal/resolver/unix/unix.go b/vendor/google.golang.org/grpc/internal/resolver/unix/unix.go
new file mode 100644
index 000000000..0d5a811dd
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/resolver/unix/unix.go
@@ -0,0 +1,63 @@
+/*
+ *
+ * Copyright 2020 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 unix implements a resolver for unix targets.
+package unix
+
+import (
+	"fmt"
+
+	"google.golang.org/grpc/internal/transport/networktype"
+	"google.golang.org/grpc/resolver"
+)
+
+const unixScheme = "unix"
+const unixAbstractScheme = "unix-abstract"
+
+type builder struct {
+	scheme string
+}
+
+func (b *builder) Build(target resolver.Target, cc resolver.ClientConn, _ resolver.BuildOptions) (resolver.Resolver, error) {
+	if target.Authority != "" {
+		return nil, fmt.Errorf("invalid (non-empty) authority: %v", target.Authority)
+	}
+	addr := resolver.Address{Addr: target.Endpoint}
+	if b.scheme == unixAbstractScheme {
+		// prepend "\x00" to address for unix-abstract
+		addr.Addr = "\x00" + addr.Addr
+	}
+	cc.UpdateState(resolver.State{Addresses: []resolver.Address{networktype.Set(addr, "unix")}})
+	return &nopResolver{}, nil
+}
+
+func (b *builder) Scheme() string {
+	return b.scheme
+}
+
+type nopResolver struct {
+}
+
+func (*nopResolver) ResolveNow(resolver.ResolveNowOptions) {}
+
+func (*nopResolver) Close() {}
+
+func init() {
+	resolver.Register(&builder{scheme: unixScheme})
+	resolver.Register(&builder{scheme: unixAbstractScheme})
+}
diff --git a/vendor/google.golang.org/grpc/internal/serviceconfig/serviceconfig.go b/vendor/google.golang.org/grpc/internal/serviceconfig/serviceconfig.go
index af3e2b5f7..c0634d152 100644
--- a/vendor/google.golang.org/grpc/internal/serviceconfig/serviceconfig.go
+++ b/vendor/google.golang.org/grpc/internal/serviceconfig/serviceconfig.go
@@ -22,8 +22,10 @@ package serviceconfig
 import (
 	"encoding/json"
 	"fmt"
+	"time"
 
 	"google.golang.org/grpc/balancer"
+	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/grpclog"
 	externalserviceconfig "google.golang.org/grpc/serviceconfig"
 )
@@ -44,6 +46,22 @@ type BalancerConfig struct {
 
 type intermediateBalancerConfig []map[string]json.RawMessage
 
+// MarshalJSON implements the json.Marshaler interface.
+//
+// It marshals the balancer and config into a length-1 slice
+// ([]map[string]config).
+func (bc *BalancerConfig) MarshalJSON() ([]byte, error) {
+	if bc.Config == nil {
+		// If config is nil, return empty config `{}`.
+		return []byte(fmt.Sprintf(`[{%q: %v}]`, bc.Name, "{}")), nil
+	}
+	c, err := json.Marshal(bc.Config)
+	if err != nil {
+		return nil, err
+	}
+	return []byte(fmt.Sprintf(`[{%q: %s}]`, bc.Name, c)), nil
+}
+
 // UnmarshalJSON implements the json.Unmarshaler interface.
 //
 // ServiceConfig contains a list of loadBalancingConfigs, each with a name and
@@ -104,3 +122,57 @@ func (bc *BalancerConfig) UnmarshalJSON(b []byte) error {
 	// case.
 	return fmt.Errorf("invalid loadBalancingConfig: no supported policies found")
 }
+
+// MethodConfig defines the configuration recommended by the service providers for a
+// particular method.
+type MethodConfig struct {
+	// WaitForReady indicates whether RPCs sent to this method should wait until
+	// the connection is ready by default (!failfast). The value specified via the
+	// gRPC client API will override the value set here.
+	WaitForReady *bool
+	// Timeout is the default timeout for RPCs sent to this method. The actual
+	// deadline used will be the minimum of the value specified here and the value
+	// set by the application via the gRPC client API.  If either one is not set,
+	// then the other will be used.  If neither is set, then the RPC has no deadline.
+	Timeout *time.Duration
+	// MaxReqSize is the maximum allowed payload size for an individual request in a
+	// stream (client->server) in bytes. The size which is measured is the serialized
+	// payload after per-message compression (but before stream compression) in bytes.
+	// The actual value used is the minimum of the value specified here and the value set
+	// by the application via the gRPC client API. If either one is not set, then the other
+	// will be used.  If neither is set, then the built-in default is used.
+	MaxReqSize *int
+	// MaxRespSize is the maximum allowed payload size for an individual response in a
+	// stream (server->client) in bytes.
+	MaxRespSize *int
+	// RetryPolicy configures retry options for the method.
+	RetryPolicy *RetryPolicy
+}
+
+// RetryPolicy defines the go-native version of the retry policy defined by the
+// service config here:
+// https://github.com/grpc/proposal/blob/master/A6-client-retries.md#integration-with-service-config
+type RetryPolicy struct {
+	// MaxAttempts is the maximum number of attempts, including the original RPC.
+	//
+	// This field is required and must be two or greater.
+	MaxAttempts int
+
+	// Exponential backoff parameters. The initial retry attempt will occur at
+	// random(0, initialBackoff). In general, the nth attempt will occur at
+	// random(0,
+	//   min(initialBackoff*backoffMultiplier**(n-1), maxBackoff)).
+	//
+	// These fields are required and must be greater than zero.
+	InitialBackoff    time.Duration
+	MaxBackoff        time.Duration
+	BackoffMultiplier float64
+
+	// The set of status codes which may be retried.
+	//
+	// Status codes are specified as strings, e.g., "UNAVAILABLE".
+	//
+	// This field is required and must be non-empty.
+	// Note: a set is used to store this for easy lookup.
+	RetryableStatusCodes map[codes.Code]bool
+}
diff --git a/vendor/google.golang.org/grpc/internal/syscall/syscall_linux.go b/vendor/google.golang.org/grpc/internal/syscall/syscall_linux.go
index 2fdcb76e6..4b2964f2a 100644
--- a/vendor/google.golang.org/grpc/internal/syscall/syscall_linux.go
+++ b/vendor/google.golang.org/grpc/internal/syscall/syscall_linux.go
@@ -44,25 +44,23 @@ func GetCPUTime() int64 {
 }
 
 // Rusage is an alias for syscall.Rusage under linux environment.
-type Rusage syscall.Rusage
+type Rusage = syscall.Rusage
 
 // GetRusage returns the resource usage of current process.
-func GetRusage() (rusage *Rusage) {
-	rusage = new(Rusage)
-	syscall.Getrusage(syscall.RUSAGE_SELF, (*syscall.Rusage)(rusage))
-	return
+func GetRusage() *Rusage {
+	rusage := new(Rusage)
+	syscall.Getrusage(syscall.RUSAGE_SELF, rusage)
+	return rusage
 }
 
 // CPUTimeDiff returns the differences of user CPU time and system CPU time used
 // between two Rusage structs.
 func CPUTimeDiff(first *Rusage, latest *Rusage) (float64, float64) {
-	f := (*syscall.Rusage)(first)
-	l := (*syscall.Rusage)(latest)
 	var (
-		utimeDiffs  = l.Utime.Sec - f.Utime.Sec
-		utimeDiffus = l.Utime.Usec - f.Utime.Usec
-		stimeDiffs  = l.Stime.Sec - f.Stime.Sec
-		stimeDiffus = l.Stime.Usec - f.Stime.Usec
+		utimeDiffs  = latest.Utime.Sec - first.Utime.Sec
+		utimeDiffus = latest.Utime.Usec - first.Utime.Usec
+		stimeDiffs  = latest.Stime.Sec - first.Stime.Sec
+		stimeDiffus = latest.Stime.Usec - first.Stime.Usec
 	)
 
 	uTimeElapsed := float64(utimeDiffs) + float64(utimeDiffus)*1.0e-6
diff --git a/vendor/google.golang.org/grpc/internal/syscall/syscall_nonlinux.go b/vendor/google.golang.org/grpc/internal/syscall/syscall_nonlinux.go
index adae60d65..7913ef1db 100644
--- a/vendor/google.golang.org/grpc/internal/syscall/syscall_nonlinux.go
+++ b/vendor/google.golang.org/grpc/internal/syscall/syscall_nonlinux.go
@@ -50,7 +50,7 @@ func GetCPUTime() int64 {
 type Rusage struct{}
 
 // GetRusage is a no-op function under non-linux or appengine environment.
-func GetRusage() (rusage *Rusage) {
+func GetRusage() *Rusage {
 	log()
 	return nil
 }
diff --git a/vendor/google.golang.org/grpc/internal/transport/controlbuf.go b/vendor/google.golang.org/grpc/internal/transport/controlbuf.go
index 40ef23923..f63a01376 100644
--- a/vendor/google.golang.org/grpc/internal/transport/controlbuf.go
+++ b/vendor/google.golang.org/grpc/internal/transport/controlbuf.go
@@ -20,13 +20,17 @@ package transport
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"runtime"
+	"strconv"
 	"sync"
 	"sync/atomic"
 
 	"golang.org/x/net/http2"
 	"golang.org/x/net/http2/hpack"
+	"google.golang.org/grpc/internal/grpcutil"
+	"google.golang.org/grpc/status"
 )
 
 var updateHeaderTblSize = func(e *hpack.Encoder, v uint32) {
@@ -128,6 +132,14 @@ type cleanupStream struct {
 
 func (c *cleanupStream) isTransportResponseFrame() bool { return c.rst } // Results in a RST_STREAM
 
+type earlyAbortStream struct {
+	streamID       uint32
+	contentSubtype string
+	status         *status.Status
+}
+
+func (*earlyAbortStream) isTransportResponseFrame() bool { return false }
+
 type dataFrame struct {
 	streamID  uint32
 	endStream bool
@@ -749,6 +761,24 @@ func (l *loopyWriter) cleanupStreamHandler(c *cleanupStream) error {
 	return nil
 }
 
+func (l *loopyWriter) earlyAbortStreamHandler(eas *earlyAbortStream) error {
+	if l.side == clientSide {
+		return errors.New("earlyAbortStream not handled on client")
+	}
+
+	headerFields := []hpack.HeaderField{
+		{Name: ":status", Value: "200"},
+		{Name: "content-type", Value: grpcutil.ContentType(eas.contentSubtype)},
+		{Name: "grpc-status", Value: strconv.Itoa(int(eas.status.Code()))},
+		{Name: "grpc-message", Value: encodeGrpcMessage(eas.status.Message())},
+	}
+
+	if err := l.writeHeader(eas.streamID, true, headerFields, nil); err != nil {
+		return err
+	}
+	return nil
+}
+
 func (l *loopyWriter) incomingGoAwayHandler(*incomingGoAway) error {
 	if l.side == clientSide {
 		l.draining = true
@@ -787,6 +817,8 @@ func (l *loopyWriter) handle(i interface{}) error {
 		return l.registerStreamHandler(i)
 	case *cleanupStream:
 		return l.cleanupStreamHandler(i)
+	case *earlyAbortStream:
+		return l.earlyAbortStreamHandler(i)
 	case *incomingGoAway:
 		return l.incomingGoAwayHandler(i)
 	case *dataFrame:
diff --git a/vendor/google.golang.org/grpc/internal/transport/http2_client.go b/vendor/google.golang.org/grpc/internal/transport/http2_client.go
index e73b77a15..48c5e52ed 100644
--- a/vendor/google.golang.org/grpc/internal/transport/http2_client.go
+++ b/vendor/google.golang.org/grpc/internal/transport/http2_client.go
@@ -32,13 +32,14 @@ import (
 
 	"golang.org/x/net/http2"
 	"golang.org/x/net/http2/hpack"
-	"google.golang.org/grpc/internal/grpcutil"
-
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/credentials"
-	"google.golang.org/grpc/internal"
 	"google.golang.org/grpc/internal/channelz"
+	icredentials "google.golang.org/grpc/internal/credentials"
+	"google.golang.org/grpc/internal/grpcutil"
+	imetadata "google.golang.org/grpc/internal/metadata"
 	"google.golang.org/grpc/internal/syscall"
+	"google.golang.org/grpc/internal/transport/networktype"
 	"google.golang.org/grpc/keepalive"
 	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/peer"
@@ -59,7 +60,7 @@ type http2Client struct {
 	cancel     context.CancelFunc
 	ctxDone    <-chan struct{} // Cache the ctx.Done() chan.
 	userAgent  string
-	md         interface{}
+	md         metadata.MD
 	conn       net.Conn // underlying communication channel
 	loopy      *loopyWriter
 	remoteAddr net.Addr
@@ -114,6 +115,9 @@ type http2Client struct {
 	// goAwayReason records the http2.ErrCode and debug data received with the
 	// GoAway frame.
 	goAwayReason GoAwayReason
+	// goAwayDebugMessage contains a detailed human readable string about a
+	// GoAway frame, useful for error messages.
+	goAwayDebugMessage string
 	// A condition variable used to signal when the keepalive goroutine should
 	// go dormant. The condition for dormancy is based on the number of active
 	// streams and the `PermitWithoutStream` keepalive client parameter. And
@@ -137,11 +141,27 @@ type http2Client struct {
 	connectionID uint64
 }
 
-func dial(ctx context.Context, fn func(context.Context, string) (net.Conn, error), addr string) (net.Conn, error) {
+func dial(ctx context.Context, fn func(context.Context, string) (net.Conn, error), addr resolver.Address, useProxy bool, grpcUA string) (net.Conn, error) {
+	address := addr.Addr
+	networkType, ok := networktype.Get(addr)
 	if fn != nil {
-		return fn(ctx, addr)
+		if networkType == "unix" && !strings.HasPrefix(address, "\x00") {
+			// For backward compatibility, if the user dialed "unix:///path",
+			// the passthrough resolver would be used and the user's custom
+			// dialer would see "unix:///path". Since the unix resolver is used
+			// and the address is now "/path", prepend "unix://" so the user's
+			// custom dialer sees the same address.
+			return fn(ctx, "unix://"+address)
+		}
+		return fn(ctx, address)
 	}
-	return (&net.Dialer{}).DialContext(ctx, "tcp", addr)
+	if !ok {
+		networkType, address = parseDialTarget(address)
+	}
+	if networkType == "tcp" && useProxy {
+		return proxyDial(ctx, address, grpcUA)
+	}
+	return (&net.Dialer{}).DialContext(ctx, networkType, address)
 }
 
 func isTemporary(err error) bool {
@@ -172,7 +192,7 @@ func newHTTP2Client(connectCtx, ctx context.Context, addr resolver.Address, opts
 		}
 	}()
 
-	conn, err := dial(connectCtx, opts.Dialer, addr.Addr)
+	conn, err := dial(connectCtx, opts.Dialer, addr, opts.UseProxy, opts.UserAgent)
 	if err != nil {
 		if opts.FailOnNonTempDialError {
 			return nil, connectionErrorf(isTemporary(err), err, "transport: error while dialing: %v", err)
@@ -220,12 +240,23 @@ func newHTTP2Client(connectCtx, ctx context.Context, addr resolver.Address, opts
 		// Attributes field of resolver.Address, which is shoved into connectCtx
 		// and passed to the credential handshaker. This makes it possible for
 		// address specific arbitrary data to reach the credential handshaker.
-		contextWithHandshakeInfo := internal.NewClientHandshakeInfoContext.(func(context.Context, credentials.ClientHandshakeInfo) context.Context)
-		connectCtx = contextWithHandshakeInfo(connectCtx, credentials.ClientHandshakeInfo{Attributes: addr.Attributes})
+		connectCtx = icredentials.NewClientHandshakeInfoContext(connectCtx, credentials.ClientHandshakeInfo{Attributes: addr.Attributes})
 		conn, authInfo, err = transportCreds.ClientHandshake(connectCtx, addr.ServerName, conn)
 		if err != nil {
 			return nil, connectionErrorf(isTemporary(err), err, "transport: authentication handshake failed: %v", err)
 		}
+		for _, cd := range perRPCCreds {
+			if cd.RequireTransportSecurity() {
+				if ci, ok := authInfo.(interface {
+					GetCommonAuthInfo() credentials.CommonAuthInfo
+				}); ok {
+					secLevel := ci.GetCommonAuthInfo().SecurityLevel
+					if secLevel != credentials.InvalidSecurityLevel && secLevel < credentials.PrivacyAndIntegrity {
+						return nil, connectionErrorf(true, nil, "transport: cannot send secure credentials on an insecure connection")
+					}
+				}
+			}
+		}
 		isSecure = true
 		if transportCreds.Info().SecurityProtocol == "tls" {
 			scheme = "https"
@@ -248,7 +279,6 @@ func newHTTP2Client(connectCtx, ctx context.Context, addr resolver.Address, opts
 		ctxDone:               ctx.Done(), // Cache Done chan.
 		cancel:                cancel,
 		userAgent:             opts.UserAgent,
-		md:                    addr.Metadata,
 		conn:                  conn,
 		remoteAddr:            conn.RemoteAddr(),
 		localAddr:             conn.LocalAddr(),
@@ -276,6 +306,12 @@ func newHTTP2Client(connectCtx, ctx context.Context, addr resolver.Address, opts
 		keepaliveEnabled:      keepaliveEnabled,
 		bufferPool:            newBufferPool(),
 	}
+
+	if md, ok := addr.Metadata.(*metadata.MD); ok {
+		t.md = *md
+	} else if md := imetadata.Get(addr); md != nil {
+		t.md = md
+	}
 	t.controlBuf = newControlBuffer(t.ctxDone)
 	if opts.InitialWindowSize >= defaultWindowSize {
 		t.initialWindowSize = opts.InitialWindowSize
@@ -312,12 +348,14 @@ func newHTTP2Client(connectCtx, ctx context.Context, addr resolver.Address, opts
 	// Send connection preface to server.
 	n, err := t.conn.Write(clientPreface)
 	if err != nil {
-		t.Close()
-		return nil, connectionErrorf(true, err, "transport: failed to write client preface: %v", err)
+		err = connectionErrorf(true, err, "transport: failed to write client preface: %v", err)
+		t.Close(err)
+		return nil, err
 	}
 	if n != len(clientPreface) {
-		t.Close()
-		return nil, connectionErrorf(true, err, "transport: preface mismatch, wrote %d bytes; want %d", n, len(clientPreface))
+		err = connectionErrorf(true, nil, "transport: preface mismatch, wrote %d bytes; want %d", n, len(clientPreface))
+		t.Close(err)
+		return nil, err
 	}
 	var ss []http2.Setting
 
@@ -335,14 +373,16 @@ func newHTTP2Client(connectCtx, ctx context.Context, addr resolver.Address, opts
 	}
 	err = t.framer.fr.WriteSettings(ss...)
 	if err != nil {
-		t.Close()
-		return nil, connectionErrorf(true, err, "transport: failed to write initial settings frame: %v", err)
+		err = connectionErrorf(true, err, "transport: failed to write initial settings frame: %v", err)
+		t.Close(err)
+		return nil, err
 	}
 	// Adjust the connection flow control window if needed.
 	if delta := uint32(icwz - defaultWindowSize); delta > 0 {
 		if err := t.framer.fr.WriteWindowUpdate(0, delta); err != nil {
-			t.Close()
-			return nil, connectionErrorf(true, err, "transport: failed to write window update: %v", err)
+			err = connectionErrorf(true, err, "transport: failed to write window update: %v", err)
+			t.Close(err)
+			return nil, err
 		}
 	}
 
@@ -379,6 +419,7 @@ func (t *http2Client) newStream(ctx context.Context, callHdr *CallHdr) *Stream {
 		buf:            newRecvBuffer(),
 		headerChan:     make(chan struct{}),
 		contentSubtype: callHdr.ContentSubtype,
+		doneFunc:       callHdr.DoneFunc,
 	}
 	s.wq = newWriteQuota(defaultWriteQuota, s.done)
 	s.requestRead = func(n int) {
@@ -418,7 +459,7 @@ func (t *http2Client) createHeaderFields(ctx context.Context, callHdr *CallHdr)
 		Method:   callHdr.Method,
 		AuthInfo: t.authInfo,
 	}
-	ctxWithRequestInfo := internal.NewRequestInfoContext.(func(context.Context, credentials.RequestInfo) context.Context)(ctx, ri)
+	ctxWithRequestInfo := icredentials.NewRequestInfoContext(ctx, ri)
 	authData, err := t.getTrAuthData(ctxWithRequestInfo, aud)
 	if err != nil {
 		return nil, err
@@ -481,25 +522,23 @@ func (t *http2Client) createHeaderFields(ctx context.Context, callHdr *CallHdr)
 		for _, vv := range added {
 			for i, v := range vv {
 				if i%2 == 0 {
-					k = v
+					k = strings.ToLower(v)
 					continue
 				}
 				// HTTP doesn't allow you to set pseudoheaders after non pseudoheaders were set.
 				if isReservedHeader(k) {
 					continue
 				}
-				headerFields = append(headerFields, hpack.HeaderField{Name: strings.ToLower(k), Value: encodeMetadataHeader(k, v)})
+				headerFields = append(headerFields, hpack.HeaderField{Name: k, Value: encodeMetadataHeader(k, v)})
 			}
 		}
 	}
-	if md, ok := t.md.(*metadata.MD); ok {
-		for k, vv := range *md {
-			if isReservedHeader(k) {
-				continue
-			}
-			for _, v := range vv {
-				headerFields = append(headerFields, hpack.HeaderField{Name: k, Value: encodeMetadataHeader(k, v)})
-			}
+	for k, vv := range t.md {
+		if isReservedHeader(k) {
+			continue
+		}
+		for _, v := range vv {
+			headerFields = append(headerFields, hpack.HeaderField{Name: k, Value: encodeMetadataHeader(k, v)})
 		}
 	}
 	return headerFields, nil
@@ -549,8 +588,11 @@ func (t *http2Client) getCallAuthData(ctx context.Context, audience string, call
 	// Note: if these credentials are provided both via dial options and call
 	// options, then both sets of credentials will be applied.
 	if callCreds := callHdr.Creds; callCreds != nil {
-		if !t.isSecure && callCreds.RequireTransportSecurity() {
-			return nil, status.Error(codes.Unauthenticated, "transport: cannot send secure credentials on an insecure connection")
+		if callCreds.RequireTransportSecurity() {
+			ri, _ := credentials.RequestInfoFromContext(ctx)
+			if !t.isSecure || credentials.CheckSecurityLevel(ri.AuthInfo, credentials.PrivacyAndIntegrity) != nil {
+				return nil, status.Error(codes.Unauthenticated, "transport: cannot send secure credentials on an insecure connection")
+			}
 		}
 		data, err := callCreds.GetRequestMetadata(ctx, audience)
 		if err != nil {
@@ -796,6 +838,9 @@ func (t *http2Client) closeStream(s *Stream, err error, rst bool, rstCode http2.
 	t.controlBuf.executeAndPut(addBackStreamQuota, cleanup)
 	// This will unblock write.
 	close(s.done)
+	if s.doneFunc != nil {
+		s.doneFunc()
+	}
 }
 
 // Close kicks off the shutdown process of the transport. This should be called
@@ -805,12 +850,12 @@ func (t *http2Client) closeStream(s *Stream, err error, rst bool, rstCode http2.
 // This method blocks until the addrConn that initiated this transport is
 // re-connected. This happens because t.onClose() begins reconnect logic at the
 // addrConn level and blocks until the addrConn is successfully connected.
-func (t *http2Client) Close() error {
+func (t *http2Client) Close(err error) {
 	t.mu.Lock()
 	// Make sure we only Close once.
 	if t.state == closing {
 		t.mu.Unlock()
-		return nil
+		return
 	}
 	// Call t.onClose before setting the state to closing to prevent the client
 	// from attempting to create new streams ASAP.
@@ -826,13 +871,19 @@ func (t *http2Client) Close() error {
 	t.mu.Unlock()
 	t.controlBuf.finish()
 	t.cancel()
-	err := t.conn.Close()
+	t.conn.Close()
 	if channelz.IsOn() {
 		channelz.RemoveEntry(t.channelzID)
 	}
+	// Append info about previous goaways if there were any, since this may be important
+	// for understanding the root cause for this connection to be closed.
+	_, goAwayDebugMessage := t.GetGoAwayReason()
+	if len(goAwayDebugMessage) > 0 {
+		err = fmt.Errorf("closing transport due to: %v, received prior goaway: %v", err, goAwayDebugMessage)
+	}
 	// Notify all active streams.
 	for _, s := range streams {
-		t.closeStream(s, ErrConnClosing, false, http2.ErrCodeNo, status.New(codes.Unavailable, ErrConnClosing.Desc), nil, false)
+		t.closeStream(s, err, false, http2.ErrCodeNo, status.New(codes.Unavailable, err.Error()), nil, false)
 	}
 	if t.statsHandler != nil {
 		connEnd := &stats.ConnEnd{
@@ -840,7 +891,6 @@ func (t *http2Client) Close() error {
 		}
 		t.statsHandler.HandleConn(t.ctx, connEnd)
 	}
-	return err
 }
 
 // GracefulClose sets the state to draining, which prevents new streams from
@@ -859,7 +909,7 @@ func (t *http2Client) GracefulClose() {
 	active := len(t.activeStreams)
 	t.mu.Unlock()
 	if active == 0 {
-		t.Close()
+		t.Close(ErrConnClosing)
 		return
 	}
 	t.controlBuf.put(&incomingGoAway{})
@@ -1105,9 +1155,9 @@ func (t *http2Client) handleGoAway(f *http2.GoAwayFrame) {
 		}
 	}
 	id := f.LastStreamID
-	if id > 0 && id%2 != 1 {
+	if id > 0 && id%2 == 0 {
 		t.mu.Unlock()
-		t.Close()
+		t.Close(connectionErrorf(true, nil, "received goaway with non-zero even-numbered numbered stream id: %v", id))
 		return
 	}
 	// A client can receive multiple GoAways from the server (see
@@ -1125,7 +1175,7 @@ func (t *http2Client) handleGoAway(f *http2.GoAwayFrame) {
 		// If there are multiple GoAways the first one should always have an ID greater than the following ones.
 		if id > t.prevGoAwayID {
 			t.mu.Unlock()
-			t.Close()
+			t.Close(connectionErrorf(true, nil, "received goaway with stream id: %v, which exceeds stream id of previous goaway: %v", id, t.prevGoAwayID))
 			return
 		}
 	default:
@@ -1155,7 +1205,7 @@ func (t *http2Client) handleGoAway(f *http2.GoAwayFrame) {
 	active := len(t.activeStreams)
 	t.mu.Unlock()
 	if active == 0 {
-		t.Close()
+		t.Close(connectionErrorf(true, nil, "received goaway and there are no active streams"))
 	}
 }
 
@@ -1171,12 +1221,13 @@ func (t *http2Client) setGoAwayReason(f *http2.GoAwayFrame) {
 			t.goAwayReason = GoAwayTooManyPings
 		}
 	}
+	t.goAwayDebugMessage = fmt.Sprintf("code: %s, debug data: %v", f.ErrCode, string(f.DebugData()))
 }
 
-func (t *http2Client) GetGoAwayReason() GoAwayReason {
+func (t *http2Client) GetGoAwayReason() (GoAwayReason, string) {
 	t.mu.Lock()
 	defer t.mu.Unlock()
-	return t.goAwayReason
+	return t.goAwayReason, t.goAwayDebugMessage
 }
 
 func (t *http2Client) handleWindowUpdate(f *http2.WindowUpdateFrame) {
@@ -1273,7 +1324,8 @@ func (t *http2Client) reader() {
 	// Check the validity of server preface.
 	frame, err := t.framer.fr.ReadFrame()
 	if err != nil {
-		t.Close() // this kicks off resetTransport, so must be last before return
+		err = connectionErrorf(true, err, "error reading server preface: %v", err)
+		t.Close(err) // this kicks off resetTransport, so must be last before return
 		return
 	}
 	t.conn.SetReadDeadline(time.Time{}) // reset deadline once we get the settings frame (we didn't time out, yay!)
@@ -1282,7 +1334,8 @@ func (t *http2Client) reader() {
 	}
 	sf, ok := frame.(*http2.SettingsFrame)
 	if !ok {
-		t.Close() // this kicks off resetTransport, so must be last before return
+		// this kicks off resetTransport, so must be last before return
+		t.Close(connectionErrorf(true, nil, "initial http2 frame from server is not a settings frame: %T", frame))
 		return
 	}
 	t.onPrefaceReceipt()
@@ -1318,7 +1371,7 @@ func (t *http2Client) reader() {
 				continue
 			} else {
 				// Transport error.
-				t.Close()
+				t.Close(connectionErrorf(true, err, "error reading from server: %v", err))
 				return
 			}
 		}
@@ -1377,7 +1430,7 @@ func (t *http2Client) keepalive() {
 				continue
 			}
 			if outstandingPing && timeoutLeft <= 0 {
-				t.Close()
+				t.Close(connectionErrorf(true, nil, "keepalive ping failed to receive ACK within timeout"))
 				return
 			}
 			t.mu.Lock()
diff --git a/vendor/google.golang.org/grpc/internal/transport/http2_server.go b/vendor/google.golang.org/grpc/internal/transport/http2_server.go
index 0cf1cc320..11be5599c 100644
--- a/vendor/google.golang.org/grpc/internal/transport/http2_server.go
+++ b/vendor/google.golang.org/grpc/internal/transport/http2_server.go
@@ -26,6 +26,7 @@ import (
 	"io"
 	"math"
 	"net"
+	"net/http"
 	"strconv"
 	"sync"
 	"sync/atomic"
@@ -355,26 +356,6 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 	if state.data.statsTrace != nil {
 		s.ctx = stats.SetIncomingTrace(s.ctx, state.data.statsTrace)
 	}
-	if t.inTapHandle != nil {
-		var err error
-		info := &tap.Info{
-			FullMethodName: state.data.method,
-		}
-		s.ctx, err = t.inTapHandle(s.ctx, info)
-		if err != nil {
-			if logger.V(logLevel) {
-				logger.Warningf("transport: http2Server.operateHeaders got an error from InTapHandle: %v", err)
-			}
-			t.controlBuf.put(&cleanupStream{
-				streamID: s.id,
-				rst:      true,
-				rstCode:  http2.ErrCodeRefusedStream,
-				onWrite:  func() {},
-			})
-			s.cancel()
-			return false
-		}
-	}
 	t.mu.Lock()
 	if t.state != reachable {
 		t.mu.Unlock()
@@ -402,6 +383,39 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 		return true
 	}
 	t.maxStreamID = streamID
+	if state.data.httpMethod != http.MethodPost {
+		t.mu.Unlock()
+		if logger.V(logLevel) {
+			logger.Warningf("transport: http2Server.operateHeaders parsed a :method field: %v which should be POST", state.data.httpMethod)
+		}
+		t.controlBuf.put(&cleanupStream{
+			streamID: streamID,
+			rst:      true,
+			rstCode:  http2.ErrCodeProtocol,
+			onWrite:  func() {},
+		})
+		s.cancel()
+		return false
+	}
+	if t.inTapHandle != nil {
+		var err error
+		if s.ctx, err = t.inTapHandle(s.ctx, &tap.Info{FullMethodName: state.data.method}); err != nil {
+			t.mu.Unlock()
+			if logger.V(logLevel) {
+				logger.Infof("transport: http2Server.operateHeaders got an error from InTapHandle: %v", err)
+			}
+			stat, ok := status.FromError(err)
+			if !ok {
+				stat = status.New(codes.PermissionDenied, err.Error())
+			}
+			t.controlBuf.put(&earlyAbortStream{
+				streamID:       s.id,
+				contentSubtype: s.contentSubtype,
+				status:         stat,
+			})
+			return false
+		}
+	}
 	t.activeStreams[streamID] = s
 	if len(t.activeStreams) == 1 {
 		t.idle = time.Time{}
diff --git a/vendor/google.golang.org/grpc/internal/transport/http_util.go b/vendor/google.golang.org/grpc/internal/transport/http_util.go
index 4d15afbf7..c7dee140c 100644
--- a/vendor/google.golang.org/grpc/internal/transport/http_util.go
+++ b/vendor/google.golang.org/grpc/internal/transport/http_util.go
@@ -27,6 +27,7 @@ import (
 	"math"
 	"net"
 	"net/http"
+	"net/url"
 	"strconv"
 	"strings"
 	"time"
@@ -110,6 +111,7 @@ type parsedHeaderData struct {
 	timeoutSet bool
 	timeout    time.Duration
 	method     string
+	httpMethod string
 	// key-value metadata map from the peer.
 	mdata          map[string][]string
 	statsTags      []byte
@@ -362,6 +364,8 @@ func (d *decodeState) processHeaderField(f hpack.HeaderField) {
 		}
 		d.data.statsTrace = v
 		d.addMetadata(f.Name, string(v))
+	case ":method":
+		d.data.httpMethod = f.Value
 	default:
 		if isReservedHeader(f.Name) && !isWhitelistedHeader(f.Name) {
 			break
@@ -598,3 +602,31 @@ func newFramer(conn net.Conn, writeBufferSize, readBufferSize int, maxHeaderList
 	f.fr.ReadMetaHeaders = hpack.NewDecoder(http2InitHeaderTableSize, nil)
 	return f
 }
+
+// parseDialTarget returns the network and address to pass to dialer.
+func parseDialTarget(target string) (string, string) {
+	net := "tcp"
+	m1 := strings.Index(target, ":")
+	m2 := strings.Index(target, ":/")
+	// handle unix:addr which will fail with url.Parse
+	if m1 >= 0 && m2 < 0 {
+		if n := target[0:m1]; n == "unix" {
+			return n, target[m1+1:]
+		}
+	}
+	if m2 >= 0 {
+		t, err := url.Parse(target)
+		if err != nil {
+			return net, target
+		}
+		scheme := t.Scheme
+		addr := t.Path
+		if scheme == "unix" {
+			if addr == "" {
+				addr = t.Host
+			}
+			return scheme, addr
+		}
+	}
+	return net, target
+}
diff --git a/vendor/google.golang.org/grpc/internal/transport/networktype/networktype.go b/vendor/google.golang.org/grpc/internal/transport/networktype/networktype.go
new file mode 100644
index 000000000..96967428b
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/transport/networktype/networktype.go
@@ -0,0 +1,46 @@
+/*
+ *
+ * Copyright 2020 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 networktype declares the network type to be used in the default
+// dailer. Attribute of a resolver.Address.
+package networktype
+
+import (
+	"google.golang.org/grpc/resolver"
+)
+
+// keyType is the key to use for storing State in Attributes.
+type keyType string
+
+const key = keyType("grpc.internal.transport.networktype")
+
+// Set returns a copy of the provided address with attributes containing networkType.
+func Set(address resolver.Address, networkType string) resolver.Address {
+	address.Attributes = address.Attributes.WithValues(key, networkType)
+	return address
+}
+
+// Get returns the network type in the resolver.Address and true, or "", false
+// if not present.
+func Get(address resolver.Address) (string, bool) {
+	v := address.Attributes.Value(key)
+	if v == nil {
+		return "", false
+	}
+	return v.(string), true
+}
diff --git a/vendor/google.golang.org/grpc/proxy.go b/vendor/google.golang.org/grpc/internal/transport/proxy.go
index f8f69bfb7..a662bf39a 100644
--- a/vendor/google.golang.org/grpc/proxy.go
+++ b/vendor/google.golang.org/grpc/internal/transport/proxy.go
@@ -16,13 +16,12 @@
  *
  */
 
-package grpc
+package transport
 
 import (
 	"bufio"
 	"context"
 	"encoding/base64"
-	"errors"
 	"fmt"
 	"io"
 	"net"
@@ -34,8 +33,6 @@ import (
 const proxyAuthHeaderKey = "Proxy-Authorization"
 
 var (
-	// errDisabled indicates that proxy is disabled for the address.
-	errDisabled = errors.New("proxy is disabled for the address")
 	// The following variable will be overwritten in the tests.
 	httpProxyFromEnvironment = http.ProxyFromEnvironment
 )
@@ -51,9 +48,6 @@ func mapAddress(ctx context.Context, address string) (*url.URL, error) {
 	if err != nil {
 		return nil, err
 	}
-	if url == nil {
-		return nil, errDisabled
-	}
 	return url, nil
 }
 
@@ -76,7 +70,7 @@ func basicAuth(username, password string) string {
 	return base64.StdEncoding.EncodeToString([]byte(auth))
 }
 
-func doHTTPConnectHandshake(ctx context.Context, conn net.Conn, backendAddr string, proxyURL *url.URL) (_ net.Conn, err error) {
+func doHTTPConnectHandshake(ctx context.Context, conn net.Conn, backendAddr string, proxyURL *url.URL, grpcUA string) (_ net.Conn, err error) {
 	defer func() {
 		if err != nil {
 			conn.Close()
@@ -115,32 +109,28 @@ func doHTTPConnectHandshake(ctx context.Context, conn net.Conn, backendAddr stri
 	return &bufConn{Conn: conn, r: r}, nil
 }
 
-// newProxyDialer returns a dialer that connects to proxy first if necessary.
-// The returned dialer checks if a proxy is necessary, dial to the proxy with the
-// provided dialer, does HTTP CONNECT handshake and returns the connection.
-func newProxyDialer(dialer func(context.Context, string) (net.Conn, error)) func(context.Context, string) (net.Conn, error) {
-	return func(ctx context.Context, addr string) (conn net.Conn, err error) {
-		var newAddr string
-		proxyURL, err := mapAddress(ctx, addr)
-		if err != nil {
-			if err != errDisabled {
-				return nil, err
-			}
-			newAddr = addr
-		} else {
-			newAddr = proxyURL.Host
-		}
+// proxyDial dials, connecting to a proxy first if necessary. Checks if a proxy
+// is necessary, dials, does the HTTP CONNECT handshake, and returns the
+// connection.
+func proxyDial(ctx context.Context, addr string, grpcUA string) (conn net.Conn, err error) {
+	newAddr := addr
+	proxyURL, err := mapAddress(ctx, addr)
+	if err != nil {
+		return nil, err
+	}
+	if proxyURL != nil {
+		newAddr = proxyURL.Host
+	}
 
-		conn, err = dialer(ctx, newAddr)
-		if err != nil {
-			return
-		}
-		if proxyURL != nil {
-			// proxy is disabled if proxyURL is nil.
-			conn, err = doHTTPConnectHandshake(ctx, conn, addr, proxyURL)
-		}
+	conn, err = (&net.Dialer{}).DialContext(ctx, "tcp", newAddr)
+	if err != nil {
 		return
 	}
+	if proxyURL != nil {
+		// proxy is disabled if proxyURL is nil.
+		conn, err = doHTTPConnectHandshake(ctx, conn, addr, proxyURL, grpcUA)
+	}
+	return
 }
 
 func sendHTTPRequest(ctx context.Context, req *http.Request, conn net.Conn) error {
diff --git a/vendor/google.golang.org/grpc/internal/transport/transport.go b/vendor/google.golang.org/grpc/internal/transport/transport.go
index b74030a96..6cc1031fd 100644
--- a/vendor/google.golang.org/grpc/internal/transport/transport.go
+++ b/vendor/google.golang.org/grpc/internal/transport/transport.go
@@ -241,6 +241,7 @@ type Stream struct {
 	ctx          context.Context    // the associated context of the stream
 	cancel       context.CancelFunc // always nil for client side Stream
 	done         chan struct{}      // closed at the end of stream to unblock writers. On the client side.
+	doneFunc     func()             // invoked at the end of stream on client side.
 	ctxDone      <-chan struct{}    // same as done chan but for server side. Cache of ctx.Done() (for performance)
 	method       string             // the associated RPC method of the stream
 	recvCompress string
@@ -569,6 +570,8 @@ type ConnectOptions struct {
 	ChannelzParentID int64
 	// MaxHeaderListSize sets the max (uncompressed) size of header list that is prepared to be received.
 	MaxHeaderListSize *uint32
+	// UseProxy specifies if a proxy should be used.
+	UseProxy bool
 }
 
 // NewClientTransport establishes the transport with the required ConnectOptions
@@ -609,6 +612,8 @@ type CallHdr struct {
 	ContentSubtype string
 
 	PreviousAttempts int // value of grpc-previous-rpc-attempts header to set
+
+	DoneFunc func() // called when the stream is finished
 }
 
 // ClientTransport is the common interface for all gRPC client-side transport
@@ -617,7 +622,7 @@ type ClientTransport interface {
 	// Close tears down this transport. Once it returns, the transport
 	// should not be accessed any more. The caller must make sure this
 	// is called only once.
-	Close() error
+	Close(err error)
 
 	// GracefulClose starts to tear down the transport: the transport will stop
 	// accepting new RPCs and NewStream will return error. Once all streams are
@@ -651,8 +656,9 @@ type ClientTransport interface {
 	// HTTP/2).
 	GoAway() <-chan struct{}
 
-	// GetGoAwayReason returns the reason why GoAway frame was received.
-	GetGoAwayReason() GoAwayReason
+	// GetGoAwayReason returns the reason why GoAway frame was received, along
+	// with a human readable string with debug info.
+	GetGoAwayReason() (GoAwayReason, string)
 
 	// RemoteAddr returns the remote network address.
 	RemoteAddr() net.Addr
diff --git a/vendor/google.golang.org/grpc/internal/xds_handshake_cluster.go b/vendor/google.golang.org/grpc/internal/xds_handshake_cluster.go
new file mode 100644
index 000000000..3677c3f04
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/xds_handshake_cluster.go
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2021 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 internal
+
+import (
+	"google.golang.org/grpc/attributes"
+	"google.golang.org/grpc/resolver"
+)
+
+// handshakeClusterNameKey is the type used as the key to store cluster name in
+// the Attributes field of resolver.Address.
+type handshakeClusterNameKey struct{}
+
+// SetXDSHandshakeClusterName returns a copy of addr in which the Attributes field
+// is updated with the cluster name.
+func SetXDSHandshakeClusterName(addr resolver.Address, clusterName string) resolver.Address {
+	addr.Attributes = addr.Attributes.WithValues(handshakeClusterNameKey{}, clusterName)
+	return addr
+}
+
+// GetXDSHandshakeClusterName returns cluster name stored in attr.
+func GetXDSHandshakeClusterName(attr *attributes.Attributes) (string, bool) {
+	v := attr.Value(handshakeClusterNameKey{})
+	name, ok := v.(string)
+	return name, ok
+}
diff --git a/vendor/google.golang.org/grpc/metadata/metadata.go b/vendor/google.golang.org/grpc/metadata/metadata.go
index cf6d1b947..e4cbea917 100644
--- a/vendor/google.golang.org/grpc/metadata/metadata.go
+++ b/vendor/google.golang.org/grpc/metadata/metadata.go
@@ -75,13 +75,9 @@ func Pairs(kv ...string) MD {
 		panic(fmt.Sprintf("metadata: Pairs got the odd number of input pairs for metadata: %d", len(kv)))
 	}
 	md := MD{}
-	var key string
-	for i, s := range kv {
-		if i%2 == 0 {
-			key = strings.ToLower(s)
-			continue
-		}
-		md[key] = append(md[key], s)
+	for i := 0; i < len(kv); i += 2 {
+		key := strings.ToLower(kv[i])
+		md[key] = append(md[key], kv[i+1])
 	}
 	return md
 }
@@ -195,12 +191,18 @@ func FromOutgoingContext(ctx context.Context) (MD, bool) {
 		return nil, false
 	}
 
-	mds := make([]MD, 0, len(raw.added)+1)
-	mds = append(mds, raw.md)
-	for _, vv := range raw.added {
-		mds = append(mds, Pairs(vv...))
+	out := raw.md.Copy()
+	for _, added := range raw.added {
+		if len(added)%2 == 1 {
+			panic(fmt.Sprintf("metadata: FromOutgoingContext got an odd number of input pairs for metadata: %d", len(added)))
+		}
+
+		for i := 0; i < len(added); i += 2 {
+			key := strings.ToLower(added[i])
+			out[key] = append(out[key], added[i+1])
+		}
 	}
-	return Join(mds...), ok
+	return out, ok
 }
 
 type rawMD struct {
diff --git a/vendor/google.golang.org/grpc/pickfirst.go b/vendor/google.golang.org/grpc/pickfirst.go
index 56e33f6c7..b858c2a5e 100644
--- a/vendor/google.golang.org/grpc/pickfirst.go
+++ b/vendor/google.golang.org/grpc/pickfirst.go
@@ -84,7 +84,7 @@ func (b *pickfirstBalancer) UpdateClientConnState(cs balancer.ClientConnState) e
 		b.cc.UpdateState(balancer.State{ConnectivityState: connectivity.Idle, Picker: &picker{result: balancer.PickResult{SubConn: b.sc}}})
 		b.sc.Connect()
 	} else {
-		b.sc.UpdateAddresses(cs.ResolverState.Addresses)
+		b.cc.UpdateAddresses(b.sc, cs.ResolverState.Addresses)
 		b.sc.Connect()
 	}
 	return nil
diff --git a/vendor/google.golang.org/grpc/regenerate.sh b/vendor/google.golang.org/grpc/regenerate.sh
index 3443ad975..dfd3226a1 100644
--- a/vendor/google.golang.org/grpc/regenerate.sh
+++ b/vendor/google.golang.org/grpc/regenerate.sh
@@ -40,29 +40,14 @@ echo "go install cmd/protoc-gen-go-grpc"
 echo "git clone https://github.com/grpc/grpc-proto"
 git clone --quiet https://github.com/grpc/grpc-proto ${WORKDIR}/grpc-proto
 
+echo "git clone https://github.com/protocolbuffers/protobuf"
+git clone --quiet https://github.com/protocolbuffers/protobuf ${WORKDIR}/protobuf
+
 # Pull in code.proto as a proto dependency
 mkdir -p ${WORKDIR}/googleapis/google/rpc
 echo "curl https://raw.githubusercontent.com/googleapis/googleapis/master/google/rpc/code.proto"
 curl --silent https://raw.githubusercontent.com/googleapis/googleapis/master/google/rpc/code.proto > ${WORKDIR}/googleapis/google/rpc/code.proto
 
-# Pull in the following repos to build the MeshCA config proto.
-ENVOY_API_REPOS=(
-  "https://github.com/envoyproxy/data-plane-api"
-  "https://github.com/cncf/udpa"
-  "https://github.com/envoyproxy/protoc-gen-validate"
-)
-for repo in ${ENVOY_API_REPOS[@]}; do
-  dirname=$(basename ${repo})
-  mkdir -p ${WORKDIR}/${dirname}
-  echo "git clone ${repo}"
-  git clone --quiet ${repo} ${WORKDIR}/${dirname}
-done
-
-# Pull in the MeshCA service proto.
-mkdir -p ${WORKDIR}/istio/istio/google/security/meshca/v1
-echo "curl https://raw.githubusercontent.com/istio/istio/master/security/proto/providers/google/meshca.proto"
-curl --silent https://raw.githubusercontent.com/istio/istio/master/security/proto/providers/google/meshca.proto > ${WORKDIR}/istio/istio/google/security/meshca/v1/meshca.proto
-
 mkdir -p ${WORKDIR}/out
 
 # Generates sources without the embed requirement
@@ -84,15 +69,14 @@ SOURCES=(
   ${WORKDIR}/grpc-proto/grpc/lookup/v1/rls.proto
   ${WORKDIR}/grpc-proto/grpc/lookup/v1/rls_config.proto
   ${WORKDIR}/grpc-proto/grpc/service_config/service_config.proto
-  ${WORKDIR}/grpc-proto/grpc/tls/provider/meshca/experimental/config.proto
-  ${WORKDIR}/istio/istio/google/security/meshca/v1/meshca.proto
+  ${WORKDIR}/grpc-proto/grpc/testing/*.proto
+  ${WORKDIR}/grpc-proto/grpc/core/*.proto
 )
 
 # These options of the form 'Mfoo.proto=bar' instruct the codegen to use an
 # import path of 'bar' in the generated code when 'foo.proto' is imported in
 # one of the sources.
-OPTS=Mgrpc/service_config/service_config.proto=/internal/proto/grpc_service_config,\
-Menvoy/config/core/v3/config_source.proto=github.com/envoyproxy/go-control-plane/envoy/config/core/v3
+OPTS=Mgrpc/service_config/service_config.proto=/internal/proto/grpc_service_config,Mgrpc/core/stats.proto=google.golang.org/grpc/interop/grpc_testing/core
 
 for src in ${SOURCES[@]}; do
   echo "protoc ${src}"
@@ -100,9 +84,7 @@ for src in ${SOURCES[@]}; do
     -I"." \
     -I${WORKDIR}/grpc-proto \
     -I${WORKDIR}/googleapis \
-    -I${WORKDIR}/data-plane-api \
-    -I${WORKDIR}/udpa \
-    -I${WORKDIR}/protoc-gen-validate \
+    -I${WORKDIR}/protobuf/src \
     -I${WORKDIR}/istio \
     ${src}
 done
@@ -113,9 +95,7 @@ for src in ${LEGACY_SOURCES[@]}; do
     -I"." \
     -I${WORKDIR}/grpc-proto \
     -I${WORKDIR}/googleapis \
-    -I${WORKDIR}/data-plane-api \
-    -I${WORKDIR}/udpa \
-    -I${WORKDIR}/protoc-gen-validate \
+    -I${WORKDIR}/protobuf/src \
     -I${WORKDIR}/istio \
     ${src}
 done
@@ -132,8 +112,8 @@ rm ${WORKDIR}/out/google.golang.org/grpc/reflection/grpc_testingv3/*.pb.go
 # grpc/service_config/service_config.proto does not have a go_package option.
 mv ${WORKDIR}/out/grpc/service_config/service_config.pb.go internal/proto/grpc_service_config
 
-# istio/google/security/meshca/v1/meshca.proto does not have a go_package option.
-mkdir -p ${WORKDIR}/out/google.golang.org/grpc/credentials/tls/certprovider/meshca/internal/v1/
-mv ${WORKDIR}/out/istio/google/security/meshca/v1/* ${WORKDIR}/out/google.golang.org/grpc/credentials/tls/certprovider/meshca/internal/v1/
+# grpc/testing does not have a go_package option.
+mv ${WORKDIR}/out/grpc/testing/*.pb.go interop/grpc_testing/
+mv ${WORKDIR}/out/grpc/core/*.pb.go interop/grpc_testing/core/
 
 cp -R ${WORKDIR}/out/google.golang.org/grpc/* .
diff --git a/vendor/google.golang.org/grpc/resolver/resolver.go b/vendor/google.golang.org/grpc/resolver/resolver.go
index e9fa8e33d..6a9d234a5 100644
--- a/vendor/google.golang.org/grpc/resolver/resolver.go
+++ b/vendor/google.golang.org/grpc/resolver/resolver.go
@@ -181,7 +181,7 @@ type State struct {
 // gRPC to add new methods to this interface.
 type ClientConn interface {
 	// UpdateState updates the state of the ClientConn appropriately.
-	UpdateState(State)
+	UpdateState(State) error
 	// ReportError notifies the ClientConn that the Resolver encountered an
 	// error.  The ClientConn will notify the load balancer and begin calling
 	// ResolveNow on the Resolver with exponential backoff.
diff --git a/vendor/google.golang.org/grpc/resolver_conn_wrapper.go b/vendor/google.golang.org/grpc/resolver_conn_wrapper.go
index f2d81968f..4118de571 100644
--- a/vendor/google.golang.org/grpc/resolver_conn_wrapper.go
+++ b/vendor/google.golang.org/grpc/resolver_conn_wrapper.go
@@ -22,7 +22,6 @@ import (
 	"fmt"
 	"strings"
 	"sync"
-	"time"
 
 	"google.golang.org/grpc/balancer"
 	"google.golang.org/grpc/credentials"
@@ -40,9 +39,6 @@ type ccResolverWrapper struct {
 	resolver   resolver.Resolver
 	done       *grpcsync.Event
 	curState   resolver.State
-
-	pollingMu sync.Mutex
-	polling   chan struct{}
 }
 
 // newCCResolverWrapper uses the resolver.Builder to build a Resolver and
@@ -93,59 +89,19 @@ func (ccr *ccResolverWrapper) close() {
 	ccr.resolverMu.Unlock()
 }
 
-// poll begins or ends asynchronous polling of the resolver based on whether
-// err is ErrBadResolverState.
-func (ccr *ccResolverWrapper) poll(err error) {
-	ccr.pollingMu.Lock()
-	defer ccr.pollingMu.Unlock()
-	if err != balancer.ErrBadResolverState {
-		// stop polling
-		if ccr.polling != nil {
-			close(ccr.polling)
-			ccr.polling = nil
-		}
-		return
-	}
-	if ccr.polling != nil {
-		// already polling
-		return
-	}
-	p := make(chan struct{})
-	ccr.polling = p
-	go func() {
-		for i := 0; ; i++ {
-			ccr.resolveNow(resolver.ResolveNowOptions{})
-			t := time.NewTimer(ccr.cc.dopts.resolveNowBackoff(i))
-			select {
-			case <-p:
-				t.Stop()
-				return
-			case <-ccr.done.Done():
-				// Resolver has been closed.
-				t.Stop()
-				return
-			case <-t.C:
-				select {
-				case <-p:
-					return
-				default:
-				}
-				// Timer expired; re-resolve.
-			}
-		}
-	}()
-}
-
-func (ccr *ccResolverWrapper) UpdateState(s resolver.State) {
+func (ccr *ccResolverWrapper) UpdateState(s resolver.State) error {
 	if ccr.done.HasFired() {
-		return
+		return nil
 	}
 	channelz.Infof(logger, ccr.cc.channelzID, "ccResolverWrapper: sending update to cc: %v", s)
 	if channelz.IsOn() {
 		ccr.addChannelzTraceEvent(s)
 	}
 	ccr.curState = s
-	ccr.poll(ccr.cc.updateResolverState(ccr.curState, nil))
+	if err := ccr.cc.updateResolverState(ccr.curState, nil); err == balancer.ErrBadResolverState {
+		return balancer.ErrBadResolverState
+	}
+	return nil
 }
 
 func (ccr *ccResolverWrapper) ReportError(err error) {
@@ -153,7 +109,7 @@ func (ccr *ccResolverWrapper) ReportError(err error) {
 		return
 	}
 	channelz.Warningf(logger, ccr.cc.channelzID, "ccResolverWrapper: reporting error to cc: %v", err)
-	ccr.poll(ccr.cc.updateResolverState(resolver.State{}, err))
+	ccr.cc.updateResolverState(resolver.State{}, err)
 }
 
 // NewAddress is called by the resolver implementation to send addresses to gRPC.
@@ -166,7 +122,7 @@ func (ccr *ccResolverWrapper) NewAddress(addrs []resolver.Address) {
 		ccr.addChannelzTraceEvent(resolver.State{Addresses: addrs, ServiceConfig: ccr.curState.ServiceConfig})
 	}
 	ccr.curState.Addresses = addrs
-	ccr.poll(ccr.cc.updateResolverState(ccr.curState, nil))
+	ccr.cc.updateResolverState(ccr.curState, nil)
 }
 
 // NewServiceConfig is called by the resolver implementation to send service
@@ -183,14 +139,13 @@ func (ccr *ccResolverWrapper) NewServiceConfig(sc string) {
 	scpr := parseServiceConfig(sc)
 	if scpr.Err != nil {
 		channelz.Warningf(logger, ccr.cc.channelzID, "ccResolverWrapper: error parsing service config: %v", scpr.Err)
-		ccr.poll(balancer.ErrBadResolverState)
 		return
 	}
 	if channelz.IsOn() {
 		ccr.addChannelzTraceEvent(resolver.State{Addresses: ccr.curState.Addresses, ServiceConfig: scpr})
 	}
 	ccr.curState.ServiceConfig = scpr
-	ccr.poll(ccr.cc.updateResolverState(ccr.curState, nil))
+	ccr.cc.updateResolverState(ccr.curState, nil)
 }
 
 func (ccr *ccResolverWrapper) ParseServiceConfig(scJSON string) *serviceconfig.ParseResult {
diff --git a/vendor/google.golang.org/grpc/rpc_util.go b/vendor/google.golang.org/grpc/rpc_util.go
index f0609f2a4..6db356fa5 100644
--- a/vendor/google.golang.org/grpc/rpc_util.go
+++ b/vendor/google.golang.org/grpc/rpc_util.go
@@ -27,7 +27,6 @@ import (
 	"io"
 	"io/ioutil"
 	"math"
-	"net/url"
 	"strings"
 	"sync"
 	"time"
@@ -430,9 +429,10 @@ func (o ContentSubtypeCallOption) before(c *callInfo) error {
 }
 func (o ContentSubtypeCallOption) after(c *callInfo, attempt *csAttempt) {}
 
-// ForceCodec returns a CallOption that will set the given Codec to be
-// used for all request and response messages for a call. The result of calling
-// String() will be used as the content-subtype in a case-insensitive manner.
+// ForceCodec returns a CallOption that will set codec to be used for all
+// request and response messages for a call. The result of calling Name() will
+// be used as the content-subtype after converting to lowercase, unless
+// CallContentSubtype is also used.
 //
 // See Content-Type on
 // https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md#requests for
@@ -854,7 +854,17 @@ func toRPCErr(err error) error {
 // setCallInfoCodec should only be called after CallOptions have been applied.
 func setCallInfoCodec(c *callInfo) error {
 	if c.codec != nil {
-		// codec was already set by a CallOption; use it.
+		// codec was already set by a CallOption; use it, but set the content
+		// subtype if it is not set.
+		if c.contentSubtype == "" {
+			// c.codec is a baseCodec to hide the difference between grpc.Codec and
+			// encoding.Codec (Name vs. String method name).  We only support
+			// setting content subtype from encoding.Codec to avoid a behavior
+			// change with the deprecated version.
+			if ec, ok := c.codec.(encoding.Codec); ok {
+				c.contentSubtype = strings.ToLower(ec.Name())
+			}
+		}
 		return nil
 	}
 
@@ -872,40 +882,6 @@ func setCallInfoCodec(c *callInfo) error {
 	return nil
 }
 
-// parseDialTarget returns the network and address to pass to dialer
-func parseDialTarget(target string) (net string, addr string) {
-	net = "tcp"
-
-	m1 := strings.Index(target, ":")
-	m2 := strings.Index(target, ":/")
-
-	// handle unix:addr which will fail with url.Parse
-	if m1 >= 0 && m2 < 0 {
-		if n := target[0:m1]; n == "unix" {
-			net = n
-			addr = target[m1+1:]
-			return net, addr
-		}
-	}
-	if m2 >= 0 {
-		t, err := url.Parse(target)
-		if err != nil {
-			return net, target
-		}
-		scheme := t.Scheme
-		addr = t.Path
-		if scheme == "unix" {
-			net = scheme
-			if addr == "" {
-				addr = t.Host
-			}
-			return net, addr
-		}
-	}
-
-	return net, target
-}
-
 // channelzData is used to store channelz related data for ClientConn, addrConn and Server.
 // These fields cannot be embedded in the original structs (e.g. ClientConn), since to do atomic
 // operation on int64 variable on 32-bit machine, user is responsible to enforce memory alignment.
@@ -923,8 +899,7 @@ type channelzData struct {
 // buffer files to ensure compatibility with the gRPC version used.  The latest
 // support package version is 7.
 //
-// Older versions are kept for compatibility. They may be removed if
-// compatibility cannot be maintained.
+// Older versions are kept for compatibility.
 //
 // These constants should not be referenced from any other code.
 const (
diff --git a/vendor/google.golang.org/grpc/server.go b/vendor/google.golang.org/grpc/server.go
index 968eb598e..0a151dee4 100644
--- a/vendor/google.golang.org/grpc/server.go
+++ b/vendor/google.golang.org/grpc/server.go
@@ -40,6 +40,7 @@ import (
 	"google.golang.org/grpc/encoding"
 	"google.golang.org/grpc/encoding/proto"
 	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/internal"
 	"google.golang.org/grpc/internal/binarylog"
 	"google.golang.org/grpc/internal/channelz"
 	"google.golang.org/grpc/internal/grpcrand"
@@ -56,8 +57,24 @@ import (
 const (
 	defaultServerMaxReceiveMessageSize = 1024 * 1024 * 4
 	defaultServerMaxSendMessageSize    = math.MaxInt32
+
+	// Server transports are tracked in a map which is keyed on listener
+	// address. For regular gRPC traffic, connections are accepted in Serve()
+	// through a call to Accept(), and we use the actual listener address as key
+	// when we add it to the map. But for connections received through
+	// ServeHTTP(), we do not have a listener and hence use this dummy value.
+	listenerAddressForServeHTTP = "listenerAddressForServeHTTP"
 )
 
+func init() {
+	internal.GetServerCredentials = func(srv *Server) credentials.TransportCredentials {
+		return srv.opts.creds
+	}
+	internal.DrainServerTransports = func(srv *Server, addr string) {
+		srv.drainServerTransports(addr)
+	}
+}
+
 var statusOK = status.New(codes.OK, "")
 var logger = grpclog.Component("core")
 
@@ -100,9 +117,12 @@ type serverWorkerData struct {
 type Server struct {
 	opts serverOptions
 
-	mu       sync.Mutex // guards following
-	lis      map[net.Listener]bool
-	conns    map[transport.ServerTransport]bool
+	mu  sync.Mutex // guards following
+	lis map[net.Listener]bool
+	// conns contains all active server transports. It is a map keyed on a
+	// listener address with the value being the set of active transports
+	// belonging to that listener.
+	conns    map[string]map[transport.ServerTransport]bool
 	serve    bool
 	drain    bool
 	cv       *sync.Cond              // signaled when connections close for GracefulStop
@@ -259,6 +279,35 @@ func CustomCodec(codec Codec) ServerOption {
 	})
 }
 
+// ForceServerCodec returns a ServerOption that sets a codec for message
+// marshaling and unmarshaling.
+//
+// This will override any lookups by content-subtype for Codecs registered
+// with RegisterCodec.
+//
+// See Content-Type on
+// https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md#requests for
+// more details. Also see the documentation on RegisterCodec and
+// CallContentSubtype for more details on the interaction between encoding.Codec
+// and content-subtype.
+//
+// This function is provided for advanced users; prefer to register codecs
+// using encoding.RegisterCodec.
+// The server will automatically use registered codecs based on the incoming
+// requests' headers. See also
+// https://github.com/grpc/grpc-go/blob/master/Documentation/encoding.md#using-a-codec.
+// Will be supported throughout 1.x.
+//
+// Experimental
+//
+// Notice: This API is EXPERIMENTAL and may be changed or removed in a
+// later release.
+func ForceServerCodec(codec encoding.Codec) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.codec = codec
+	})
+}
+
 // RPCCompressor returns a ServerOption that sets a compressor for outbound
 // messages.  For backward compatibility, all outbound messages will be sent
 // using this compressor, regardless of incoming message compression.  By
@@ -369,6 +418,11 @@ func ChainStreamInterceptor(interceptors ...StreamServerInterceptor) ServerOptio
 
 // InTapHandle returns a ServerOption that sets the tap handle for all the server
 // transport to be created. Only one can be installed.
+//
+// Experimental
+//
+// Notice: This API is EXPERIMENTAL and may be changed or removed in a
+// later release.
 func InTapHandle(h tap.ServerInHandle) ServerOption {
 	return newFuncServerOption(func(o *serverOptions) {
 		if o.inTapHandle != nil {
@@ -512,7 +566,7 @@ func NewServer(opt ...ServerOption) *Server {
 	s := &Server{
 		lis:      make(map[net.Listener]bool),
 		opts:     opts,
-		conns:    make(map[transport.ServerTransport]bool),
+		conns:    make(map[string]map[transport.ServerTransport]bool),
 		services: make(map[string]*serviceInfo),
 		quit:     grpcsync.NewEvent(),
 		done:     grpcsync.NewEvent(),
@@ -771,7 +825,7 @@ func (s *Server) Serve(lis net.Listener) error {
 		// s.conns before this conn can be added.
 		s.serveWG.Add(1)
 		go func() {
-			s.handleRawConn(rawConn)
+			s.handleRawConn(lis.Addr().String(), rawConn)
 			s.serveWG.Done()
 		}()
 	}
@@ -779,7 +833,7 @@ func (s *Server) Serve(lis net.Listener) error {
 
 // handleRawConn forks a goroutine to handle a just-accepted connection that
 // has not had any I/O performed on it yet.
-func (s *Server) handleRawConn(rawConn net.Conn) {
+func (s *Server) handleRawConn(lisAddr string, rawConn net.Conn) {
 	if s.quit.HasFired() {
 		rawConn.Close()
 		return
@@ -807,15 +861,24 @@ func (s *Server) handleRawConn(rawConn net.Conn) {
 	}
 
 	rawConn.SetDeadline(time.Time{})
-	if !s.addConn(st) {
+	if !s.addConn(lisAddr, st) {
 		return
 	}
 	go func() {
 		s.serveStreams(st)
-		s.removeConn(st)
+		s.removeConn(lisAddr, st)
 	}()
 }
 
+func (s *Server) drainServerTransports(addr string) {
+	s.mu.Lock()
+	conns := s.conns[addr]
+	for st := range conns {
+		st.Drain()
+	}
+	s.mu.Unlock()
+}
+
 // newHTTP2Transport sets up a http/2 transport (using the
 // gRPC http2 server transport in transport/http2_server.go).
 func (s *Server) newHTTP2Transport(c net.Conn, authInfo credentials.AuthInfo) transport.ServerTransport {
@@ -917,10 +980,10 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return
 	}
-	if !s.addConn(st) {
+	if !s.addConn(listenerAddressForServeHTTP, st) {
 		return
 	}
-	defer s.removeConn(st)
+	defer s.removeConn(listenerAddressForServeHTTP, st)
 	s.serveStreams(st)
 }
 
@@ -948,7 +1011,7 @@ func (s *Server) traceInfo(st transport.ServerTransport, stream *transport.Strea
 	return trInfo
 }
 
-func (s *Server) addConn(st transport.ServerTransport) bool {
+func (s *Server) addConn(addr string, st transport.ServerTransport) bool {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 	if s.conns == nil {
@@ -960,15 +1023,28 @@ func (s *Server) addConn(st transport.ServerTransport) bool {
 		// immediately.
 		st.Drain()
 	}
-	s.conns[st] = true
+
+	if s.conns[addr] == nil {
+		// Create a map entry if this is the first connection on this listener.
+		s.conns[addr] = make(map[transport.ServerTransport]bool)
+	}
+	s.conns[addr][st] = true
 	return true
 }
 
-func (s *Server) removeConn(st transport.ServerTransport) {
+func (s *Server) removeConn(addr string, st transport.ServerTransport) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
-	if s.conns != nil {
-		delete(s.conns, st)
+
+	conns := s.conns[addr]
+	if conns != nil {
+		delete(conns, st)
+		if len(conns) == 0 {
+			// If the last connection for this address is being removed, also
+			// remove the map entry corresponding to the address. This is used
+			// in GracefulStop() when waiting for all connections to be closed.
+			delete(s.conns, addr)
+		}
 		s.cv.Broadcast()
 	}
 }
@@ -1632,7 +1708,7 @@ func (s *Server) Stop() {
 	s.mu.Lock()
 	listeners := s.lis
 	s.lis = nil
-	st := s.conns
+	conns := s.conns
 	s.conns = nil
 	// interrupt GracefulStop if Stop and GracefulStop are called concurrently.
 	s.cv.Broadcast()
@@ -1641,8 +1717,10 @@ func (s *Server) Stop() {
 	for lis := range listeners {
 		lis.Close()
 	}
-	for c := range st {
-		c.Close()
+	for _, cs := range conns {
+		for st := range cs {
+			st.Close()
+		}
 	}
 	if s.opts.numServerWorkers > 0 {
 		s.stopServerWorkers()
@@ -1679,8 +1757,10 @@ func (s *Server) GracefulStop() {
 	}
 	s.lis = nil
 	if !s.drain {
-		for st := range s.conns {
-			st.Drain()
+		for _, conns := range s.conns {
+			for st := range conns {
+				st.Drain()
+			}
 		}
 		s.drain = true
 	}
diff --git a/vendor/google.golang.org/grpc/service_config.go b/vendor/google.golang.org/grpc/service_config.go
index 5e434ca7f..22c4240cf 100644
--- a/vendor/google.golang.org/grpc/service_config.go
+++ b/vendor/google.golang.org/grpc/service_config.go
@@ -41,29 +41,7 @@ const maxInt = int(^uint(0) >> 1)
 // Deprecated: Users should not use this struct. Service config should be received
 // through name resolver, as specified here
 // https://github.com/grpc/grpc/blob/master/doc/service_config.md
-type MethodConfig struct {
-	// WaitForReady indicates whether RPCs sent to this method should wait until
-	// the connection is ready by default (!failfast). The value specified via the
-	// gRPC client API will override the value set here.
-	WaitForReady *bool
-	// Timeout is the default timeout for RPCs sent to this method. The actual
-	// deadline used will be the minimum of the value specified here and the value
-	// set by the application via the gRPC client API.  If either one is not set,
-	// then the other will be used.  If neither is set, then the RPC has no deadline.
-	Timeout *time.Duration
-	// MaxReqSize is the maximum allowed payload size for an individual request in a
-	// stream (client->server) in bytes. The size which is measured is the serialized
-	// payload after per-message compression (but before stream compression) in bytes.
-	// The actual value used is the minimum of the value specified here and the value set
-	// by the application via the gRPC client API. If either one is not set, then the other
-	// will be used.  If neither is set, then the built-in default is used.
-	MaxReqSize *int
-	// MaxRespSize is the maximum allowed payload size for an individual response in a
-	// stream (server->client) in bytes.
-	MaxRespSize *int
-	// RetryPolicy configures retry options for the method.
-	retryPolicy *retryPolicy
-}
+type MethodConfig = internalserviceconfig.MethodConfig
 
 type lbConfig struct {
 	name string
@@ -127,34 +105,6 @@ type healthCheckConfig struct {
 	ServiceName string
 }
 
-// retryPolicy defines the go-native version of the retry policy defined by the
-// service config here:
-// https://github.com/grpc/proposal/blob/master/A6-client-retries.md#integration-with-service-config
-type retryPolicy struct {
-	// MaxAttempts is the maximum number of attempts, including the original RPC.
-	//
-	// This field is required and must be two or greater.
-	maxAttempts int
-
-	// Exponential backoff parameters. The initial retry attempt will occur at
-	// random(0, initialBackoff). In general, the nth attempt will occur at
-	// random(0,
-	//   min(initialBackoff*backoffMultiplier**(n-1), maxBackoff)).
-	//
-	// These fields are required and must be greater than zero.
-	initialBackoff    time.Duration
-	maxBackoff        time.Duration
-	backoffMultiplier float64
-
-	// The set of status codes which may be retried.
-	//
-	// Status codes are specified as strings, e.g., "UNAVAILABLE".
-	//
-	// This field is required and must be non-empty.
-	// Note: a set is used to store this for easy lookup.
-	retryableStatusCodes map[codes.Code]bool
-}
-
 type jsonRetryPolicy struct {
 	MaxAttempts          int
 	InitialBackoff       string
@@ -313,7 +263,7 @@ func parseServiceConfig(js string) *serviceconfig.ParseResult {
 			WaitForReady: m.WaitForReady,
 			Timeout:      d,
 		}
-		if mc.retryPolicy, err = convertRetryPolicy(m.RetryPolicy); err != nil {
+		if mc.RetryPolicy, err = convertRetryPolicy(m.RetryPolicy); err != nil {
 			logger.Warningf("grpc: parseServiceConfig error unmarshaling %s due to %v", js, err)
 			return &serviceconfig.ParseResult{Err: err}
 		}
@@ -359,7 +309,7 @@ func parseServiceConfig(js string) *serviceconfig.ParseResult {
 	return &serviceconfig.ParseResult{Config: &sc}
 }
 
-func convertRetryPolicy(jrp *jsonRetryPolicy) (p *retryPolicy, err error) {
+func convertRetryPolicy(jrp *jsonRetryPolicy) (p *internalserviceconfig.RetryPolicy, err error) {
 	if jrp == nil {
 		return nil, nil
 	}
@@ -381,19 +331,19 @@ func convertRetryPolicy(jrp *jsonRetryPolicy) (p *retryPolicy, err error) {
 		return nil, nil
 	}
 
-	rp := &retryPolicy{
-		maxAttempts:          jrp.MaxAttempts,
-		initialBackoff:       *ib,
-		maxBackoff:           *mb,
-		backoffMultiplier:    jrp.BackoffMultiplier,
-		retryableStatusCodes: make(map[codes.Code]bool),
+	rp := &internalserviceconfig.RetryPolicy{
+		MaxAttempts:          jrp.MaxAttempts,
+		InitialBackoff:       *ib,
+		MaxBackoff:           *mb,
+		BackoffMultiplier:    jrp.BackoffMultiplier,
+		RetryableStatusCodes: make(map[codes.Code]bool),
 	}
-	if rp.maxAttempts > 5 {
+	if rp.MaxAttempts > 5 {
 		// TODO(retry): Make the max maxAttempts configurable.
-		rp.maxAttempts = 5
+		rp.MaxAttempts = 5
 	}
 	for _, code := range jrp.RetryableStatusCodes {
-		rp.retryableStatusCodes[code] = true
+		rp.RetryableStatusCodes[code] = true
 	}
 	return rp, nil
 }
diff --git a/vendor/google.golang.org/grpc/status/status.go b/vendor/google.golang.org/grpc/status/status.go
index 01e182c30..54d187186 100644
--- a/vendor/google.golang.org/grpc/status/status.go
+++ b/vendor/google.golang.org/grpc/status/status.go
@@ -73,9 +73,11 @@ func FromProto(s *spb.Status) *Status {
 	return status.FromProto(s)
 }
 
-// FromError returns a Status representing err if it was produced from this
-// package or has a method `GRPCStatus() *Status`. Otherwise, ok is false and a
-// Status is returned with codes.Unknown and the original error message.
+// FromError returns a Status representing err if it was produced by this
+// package or has a method `GRPCStatus() *Status`.
+// If err is nil, a Status is returned with codes.OK and no message.
+// Otherwise, ok is false and a Status is returned with codes.Unknown and
+// the original error message.
 func FromError(err error) (s *Status, ok bool) {
 	if err == nil {
 		return nil, true
diff --git a/vendor/google.golang.org/grpc/stream.go b/vendor/google.golang.org/grpc/stream.go
index 5fd856a38..1f3e70d2c 100644
--- a/vendor/google.golang.org/grpc/stream.go
+++ b/vendor/google.golang.org/grpc/stream.go
@@ -36,6 +36,8 @@ import (
 	"google.golang.org/grpc/internal/channelz"
 	"google.golang.org/grpc/internal/grpcrand"
 	"google.golang.org/grpc/internal/grpcutil"
+	iresolver "google.golang.org/grpc/internal/resolver"
+	"google.golang.org/grpc/internal/serviceconfig"
 	"google.golang.org/grpc/internal/transport"
 	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/peer"
@@ -50,14 +52,20 @@ import (
 // of the RPC.
 type StreamHandler func(srv interface{}, stream ServerStream) error
 
-// StreamDesc represents a streaming RPC service's method specification.
+// StreamDesc represents a streaming RPC service's method specification.  Used
+// on the server when registering services and on the client when initiating
+// new streams.
 type StreamDesc struct {
-	StreamName string
-	Handler    StreamHandler
-
-	// At least one of these is true.
-	ServerStreams bool
-	ClientStreams bool
+	// StreamName and Handler are only used when registering handlers on a
+	// server.
+	StreamName string        // the name of the method excluding the service
+	Handler    StreamHandler // the handler called for the method
+
+	// ServerStreams and ClientStreams are used for registering handlers on a
+	// server as well as defining RPC behavior when passed to NewClientStream
+	// and ClientConn.NewStream.  At least one must be true.
+	ServerStreams bool // indicates the server can perform streaming sends
+	ClientStreams bool // indicates the client can perform streaming sends
 }
 
 // Stream defines the common interface a client or server stream has to satisfy.
@@ -164,13 +172,48 @@ func newClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, meth
 			}
 		}()
 	}
-	c := defaultCallInfo()
 	// Provide an opportunity for the first RPC to see the first service config
 	// provided by the resolver.
 	if err := cc.waitForResolvedAddrs(ctx); err != nil {
 		return nil, err
 	}
-	mc := cc.GetMethodConfig(method)
+
+	var mc serviceconfig.MethodConfig
+	var onCommit func()
+	var newStream = func(ctx context.Context, done func()) (iresolver.ClientStream, error) {
+		return newClientStreamWithParams(ctx, desc, cc, method, mc, onCommit, done, opts...)
+	}
+
+	rpcInfo := iresolver.RPCInfo{Context: ctx, Method: method}
+	rpcConfig, err := cc.safeConfigSelector.SelectConfig(rpcInfo)
+	if err != nil {
+		return nil, toRPCErr(err)
+	}
+
+	if rpcConfig != nil {
+		if rpcConfig.Context != nil {
+			ctx = rpcConfig.Context
+		}
+		mc = rpcConfig.MethodConfig
+		onCommit = rpcConfig.OnCommitted
+		if rpcConfig.Interceptor != nil {
+			rpcInfo.Context = nil
+			ns := newStream
+			newStream = func(ctx context.Context, done func()) (iresolver.ClientStream, error) {
+				cs, err := rpcConfig.Interceptor.NewStream(ctx, rpcInfo, done, ns)
+				if err != nil {
+					return nil, toRPCErr(err)
+				}
+				return cs, nil
+			}
+		}
+	}
+
+	return newStream(ctx, func() {})
+}
+
+func newClientStreamWithParams(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, mc serviceconfig.MethodConfig, onCommit, doneFunc func(), opts ...CallOption) (_ iresolver.ClientStream, err error) {
+	c := defaultCallInfo()
 	if mc.WaitForReady != nil {
 		c.failFast = !*mc.WaitForReady
 	}
@@ -207,6 +250,7 @@ func newClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, meth
 		Host:           cc.authority,
 		Method:         method,
 		ContentSubtype: c.contentSubtype,
+		DoneFunc:       doneFunc,
 	}
 
 	// Set our outgoing compression according to the UseCompressor CallOption, if
@@ -272,6 +316,7 @@ func newClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, meth
 		cancel:       cancel,
 		beginTime:    beginTime,
 		firstAttempt: true,
+		onCommit:     onCommit,
 	}
 	if !cc.dopts.disableRetry {
 		cs.retryThrottler = cc.retryThrottler.Load().(*retryThrottler)
@@ -432,7 +477,8 @@ type clientStream struct {
 	// place where we need to check if the attempt is nil.
 	attempt *csAttempt
 	// TODO(hedging): hedging will have multiple attempts simultaneously.
-	committed  bool                       // active attempt committed for retry?
+	committed  bool // active attempt committed for retry?
+	onCommit   func()
 	buffer     []func(a *csAttempt) error // operations to replay on retry
 	bufferSize int                        // current size of buffer
 }
@@ -461,6 +507,9 @@ type csAttempt struct {
 }
 
 func (cs *clientStream) commitAttemptLocked() {
+	if !cs.committed && cs.onCommit != nil {
+		cs.onCommit()
+	}
 	cs.committed = true
 	cs.buffer = nil
 }
@@ -539,8 +588,8 @@ func (cs *clientStream) shouldRetry(err error) error {
 		code = status.Convert(err).Code()
 	}
 
-	rp := cs.methodConfig.retryPolicy
-	if rp == nil || !rp.retryableStatusCodes[code] {
+	rp := cs.methodConfig.RetryPolicy
+	if rp == nil || !rp.RetryableStatusCodes[code] {
 		return err
 	}
 
@@ -549,7 +598,7 @@ func (cs *clientStream) shouldRetry(err error) error {
 	if cs.retryThrottler.throttle() {
 		return err
 	}
-	if cs.numRetries+1 >= rp.maxAttempts {
+	if cs.numRetries+1 >= rp.MaxAttempts {
 		return err
 	}
 
@@ -558,9 +607,9 @@ func (cs *clientStream) shouldRetry(err error) error {
 		dur = time.Millisecond * time.Duration(pushback)
 		cs.numRetriesSincePushback = 0
 	} else {
-		fact := math.Pow(rp.backoffMultiplier, float64(cs.numRetriesSincePushback))
-		cur := float64(rp.initialBackoff) * fact
-		if max := float64(rp.maxBackoff); cur > max {
+		fact := math.Pow(rp.BackoffMultiplier, float64(cs.numRetriesSincePushback))
+		cur := float64(rp.InitialBackoff) * fact
+		if max := float64(rp.MaxBackoff); cur > max {
 			cur = max
 		}
 		dur = time.Duration(grpcrand.Int63n(int64(cur)))
diff --git a/vendor/google.golang.org/grpc/tap/tap.go b/vendor/google.golang.org/grpc/tap/tap.go
index caea1ebed..dbf34e6bb 100644
--- a/vendor/google.golang.org/grpc/tap/tap.go
+++ b/vendor/google.golang.org/grpc/tap/tap.go
@@ -37,16 +37,16 @@ type Info struct {
 	// TODO: More to be added.
 }
 
-// ServerInHandle defines the function which runs before a new stream is created
-// on the server side. If it returns a non-nil error, the stream will not be
-// created and a RST_STREAM will be sent back to the client with REFUSED_STREAM.
-// The client will receive an RPC error "code = Unavailable, desc = stream
-// terminated by RST_STREAM with error code: REFUSED_STREAM".
+// ServerInHandle defines the function which runs before a new stream is
+// created on the server side. If it returns a non-nil error, the stream will
+// not be created and an error will be returned to the client.  If the error
+// returned is a status error, that status code and message will be used,
+// otherwise PermissionDenied will be the code and err.Error() will be the
+// message.
 //
 // It's intended to be used in situations where you don't want to waste the
-// resources to accept the new stream (e.g. rate-limiting). And the content of
-// the error will be ignored and won't be sent back to the client. For other
-// general usages, please use interceptors.
+// resources to accept the new stream (e.g. rate-limiting). For other general
+// usages, please use interceptors.
 //
 // Note that it is executed in the per-connection I/O goroutine(s) instead of
 // per-RPC goroutine. Therefore, users should NOT have any
diff --git a/vendor/google.golang.org/grpc/version.go b/vendor/google.golang.org/grpc/version.go
index 144b0bf9e..bfe5cf887 100644
--- a/vendor/google.golang.org/grpc/version.go
+++ b/vendor/google.golang.org/grpc/version.go
@@ -19,4 +19,4 @@
 package grpc
 
 // Version is the current grpc version.
-const Version = "1.33.2"
+const Version = "1.38.0"
diff --git a/vendor/google.golang.org/grpc/vet.sh b/vendor/google.golang.org/grpc/vet.sh
index 48652f604..1a0dbd7ee 100644
--- a/vendor/google.golang.org/grpc/vet.sh
+++ b/vendor/google.golang.org/grpc/vet.sh
@@ -28,7 +28,8 @@ cleanup() {
 }
 trap cleanup EXIT
 
-PATH="${GOPATH}/bin:${GOROOT}/bin:${PATH}"
+PATH="${HOME}/go/bin:${GOROOT}/bin:${PATH}"
+go version
 
 if [[ "$1" = "-install" ]]; then
   # Check for module support
@@ -53,7 +54,7 @@ if [[ "$1" = "-install" ]]; then
   fi
   if [[ -z "${VET_SKIP_PROTO}" ]]; then
     if [[ "${TRAVIS}" = "true" ]]; then
-      PROTOBUF_VERSION=3.3.0
+      PROTOBUF_VERSION=3.14.0
       PROTOC_FILENAME=protoc-${PROTOBUF_VERSION}-linux-x86_64.zip
       pushd /home/travis
       wget https://github.com/google/protobuf/releases/download/v${PROTOBUF_VERSION}/${PROTOC_FILENAME}
@@ -61,7 +62,7 @@ if [[ "$1" = "-install" ]]; then
       bin/protoc --version
       popd
     elif [[ "${GITHUB_ACTIONS}" = "true" ]]; then
-      PROTOBUF_VERSION=3.3.0
+      PROTOBUF_VERSION=3.14.0
       PROTOC_FILENAME=protoc-${PROTOBUF_VERSION}-linux-x86_64.zip
       pushd /home/runner/go
       wget https://github.com/google/protobuf/releases/download/v${PROTOBUF_VERSION}/${PROTOC_FILENAME}
@@ -104,12 +105,6 @@ git grep '"github.com/envoyproxy/go-control-plane/envoy' -- '*.go' ':(exclude)*.
 # TODO: Remove when we drop Go 1.10 support
 go list -f {{.Dir}} ./... | xargs go run test/go_vet/vet.go
 
-# - gofmt, goimports, golint (with exceptions for generated code), go vet.
-gofmt -s -d -l . 2>&1 | fail_on_output
-goimports -l . 2>&1 | not grep -vE "\.pb\.go"
-golint ./... 2>&1 | not grep -vE "\.pb\.go:"
-go vet -all ./...
-
 misspell -error .
 
 # - Check that generated proto files are up to date.
@@ -119,12 +114,22 @@ if [[ -z "${VET_SKIP_PROTO}" ]]; then
     (git status; git --no-pager diff; exit 1)
 fi
 
-# - Check that our modules are tidy.
-if go help mod >& /dev/null; then
-  find . -name 'go.mod' | xargs -IXXX bash -c 'cd $(dirname XXX); go mod tidy'
+# - gofmt, goimports, golint (with exceptions for generated code), go vet,
+# go mod tidy.
+# Perform these checks on each module inside gRPC.
+for MOD_FILE in $(find . -name 'go.mod'); do
+  MOD_DIR=$(dirname ${MOD_FILE})
+  pushd ${MOD_DIR}
+  go vet -all ./... | fail_on_output
+  gofmt -s -d -l . 2>&1 | fail_on_output
+  goimports -l . 2>&1 | not grep -vE "\.pb\.go"
+  golint ./... 2>&1 | not grep -vE "/testv3\.pb\.go:"
+
+  go mod tidy
   git status --porcelain 2>&1 | fail_on_output || \
     (git status; git --no-pager diff; exit 1)
-fi
+  popd
+done
 
 # - Collection of static analysis checks
 #
@@ -141,8 +146,11 @@ not grep -Fv '.CredsBundle
 .NewAddress
 .NewServiceConfig
 .Type is deprecated: use Attributes
+BuildVersion is deprecated
 balancer.ErrTransientFailure
 balancer.Picker
+extDesc.Filename is deprecated
+github.com/golang/protobuf/jsonpb is deprecated
 grpc.CallCustomCodec
 grpc.Code
 grpc.Compressor
@@ -164,13 +172,7 @@ grpc.WithServiceConfig
 grpc.WithTimeout
 http.CloseNotifier
 info.SecurityVersion
-resolver.Backend
-resolver.GRPCLB
-extDesc.Filename is deprecated
-BuildVersion is deprecated
-github.com/golang/protobuf/jsonpb is deprecated
 proto is deprecated
-xxx_messageInfo_
 proto.InternalMessageInfo is deprecated
 proto.EnumName is deprecated
 proto.ErrInternalBadWireType is deprecated
@@ -184,7 +186,12 @@ proto.RegisterExtension is deprecated
 proto.RegisteredExtension is deprecated
 proto.RegisteredExtensions is deprecated
 proto.RegisterMapType is deprecated
-proto.Unmarshaler is deprecated' "${SC_OUT}"
+proto.Unmarshaler is deprecated
+resolver.Backend
+resolver.GRPCLB
+Target is deprecated: Use the Target field in the BuildOptions instead.
+xxx_messageInfo_
+' "${SC_OUT}"
 
 # - special golint on package comments.
 lint_package_comment_per_package() {