From 335c945d97b249fc6eb6b65e97c4eb19bac65e78 Mon Sep 17 00:00:00 2001
From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com>
Date: Wed, 3 Nov 2021 03:39:02 +0000
Subject: [PATCH] rebase: bump google.golang.org/grpc from 1.41.0 to 1.42.0

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.41.0 to 1.42.0.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](https://github.com/grpc/grpc-go/compare/v1.41.0...v1.42.0)

---
updated-dependencies:
- dependency-name: google.golang.org/grpc
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
---
 go.mod                                        |   2 +-
 go.sum                                        |   6 +-
 .../grpc/attributes/attributes.go             |  78 +++++---
 .../grpc/balancer/base/balancer.go            |  65 ++-----
 .../grpc/balancer/grpclb/state/state.go       |   2 +-
 vendor/google.golang.org/grpc/clientconn.go   | 181 ++++++++++++++----
 .../grpc/credentials/credentials.go           |  15 +-
 vendor/google.golang.org/grpc/dialoptions.go  |  27 ++-
 vendor/google.golang.org/grpc/go.mod          |   3 +-
 vendor/google.golang.org/grpc/go.sum          |   7 +-
 .../grpc/grpclog/loggerv2.go                  |  86 ++++++---
 .../grpc/internal/envconfig/envconfig.go      |   5 +-
 .../grpc/internal/grpcutil/grpcutil.go        |  20 ++
 .../grpc/internal/grpcutil/regex.go           |  28 +++
 .../grpc/internal/grpcutil/target.go          |  89 ---------
 .../grpc/internal/metadata/metadata.go        |  30 ++-
 .../grpc/internal/resolver/config_selector.go |   2 +-
 .../grpc/internal/resolver/unix/unix.go       |  12 +-
 .../grpc/internal/transport/controlbuf.go     |   8 +-
 .../grpc/internal/transport/http2_client.go   |  61 +++---
 .../grpc/internal/transport/http2_server.go   |  51 ++++-
 .../transport/networktype/networktype.go      |   2 +-
 .../grpc/internal/xds/env/env.go              |   8 +-
 .../grpc/internal/xds_handshake_cluster.go    |   2 +-
 .../google.golang.org/grpc/picker_wrapper.go  |   2 +-
 vendor/google.golang.org/grpc/resolver/map.go | 109 +++++++++++
 .../grpc/resolver/resolver.go                 |  56 ++++--
 vendor/google.golang.org/grpc/server.go       |  52 ++---
 .../google.golang.org/grpc/status/status.go   |  15 +-
 vendor/google.golang.org/grpc/version.go      |   2 +-
 vendor/modules.txt                            |   2 +-
 31 files changed, 683 insertions(+), 345 deletions(-)
 create mode 100644 vendor/google.golang.org/grpc/internal/grpcutil/grpcutil.go
 create mode 100644 vendor/google.golang.org/grpc/internal/grpcutil/regex.go
 delete mode 100644 vendor/google.golang.org/grpc/internal/grpcutil/target.go
 create mode 100644 vendor/google.golang.org/grpc/resolver/map.go

diff --git a/go.mod b/go.mod
index 5b3474cfd..ae341e82f 100644
--- a/go.mod
+++ b/go.mod
@@ -24,7 +24,7 @@ require (
 	github.com/stretchr/testify v1.7.0
 	golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97
 	golang.org/x/sys v0.0.0-20210817190340-bfb29a6856f2
-	google.golang.org/grpc v1.41.0
+	google.golang.org/grpc v1.42.0
 	k8s.io/api v0.22.2
 	k8s.io/apimachinery v0.22.2
 	k8s.io/client-go v12.0.0+incompatible
diff --git a/go.sum b/go.sum
index ade394516..f134b6506 100644
--- a/go.sum
+++ b/go.sum
@@ -183,7 +183,10 @@ github.com/cloudfoundry/gofileutils v0.0.0-20170111115228-4d0c80011a0f/go.mod h1
 github.com/clusterhq/flocker-go v0.0.0-20160920122132-2b8b7259d313/go.mod h1:P1wt9Z3DP8O6W3rvwCt0REIlshg1InHImaLW0t3ObY0=
 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/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
+github.com/cncf/udpa/go v0.0.0-20210930031921-04548b0d99d4/go.mod h1:6pvJx4me5XPnfI9Z40ddWsdw2W/uZgQLFXToKeRcDiI=
 github.com/cncf/xds/go v0.0.0-20210805033703-aa0b78936158/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
+github.com/cncf/xds/go v0.0.0-20210922020428-25de7278fc84/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
+github.com/cncf/xds/go v0.0.0-20211011173535-cb28da3451f1/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
 github.com/cockroachdb/apd v1.1.0/go.mod h1:8Sl8LxpKi29FqWXR16WEFZRNSz3SoPzUzeMeY4+DwBQ=
 github.com/cockroachdb/cockroach-go v0.0.0-20181001143604-e0a95dfd547c/go.mod h1:XGLbWH/ujMcbPbhZq52Nv6UrCghb1yGn//133kEsvDk=
 github.com/cockroachdb/datadriven v0.0.0-20190809214429-80d97fb3cbaa/go.mod h1:zn76sxSg3SzpJ0PPJaLDCu+Bu0Lg3sKTORVIj19EIF8=
@@ -1504,8 +1507,9 @@ google.golang.org/grpc v1.35.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAG
 google.golang.org/grpc v1.36.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
 google.golang.org/grpc v1.37.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
 google.golang.org/grpc v1.38.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
-google.golang.org/grpc v1.41.0 h1:f+PlOh7QV4iIJkPrx5NQ7qaNGFQ3OTse67yaDHfju4E=
 google.golang.org/grpc v1.41.0/go.mod h1:U3l9uK9J0sini8mHphKoXyaqDA/8VyGnDee1zzIUK6k=
+google.golang.org/grpc v1.42.0 h1:XT2/MFpuPFsEX2fWh3YQtHkZ+WYZFQRfaUgLZYj/p6A=
+google.golang.org/grpc v1.42.0/go.mod h1:k+4IHHFw41K8+bbowsex27ge2rCb65oeWqe4jJ590SU=
 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=
diff --git a/vendor/google.golang.org/grpc/attributes/attributes.go b/vendor/google.golang.org/grpc/attributes/attributes.go
index 3220d87be..6ff2792ee 100644
--- a/vendor/google.golang.org/grpc/attributes/attributes.go
+++ b/vendor/google.golang.org/grpc/attributes/attributes.go
@@ -25,55 +25,75 @@
 // later release.
 package attributes
 
-import "fmt"
-
 // Attributes is an immutable struct for storing and retrieving generic
 // key/value pairs.  Keys must be hashable, and users should define their own
-// types for keys.
+// types for keys.  Values should not be modified after they are added to an
+// Attributes or if they were received from one.  If values implement 'Equal(o
+// interface{}) bool', it will be called by (*Attributes).Equal to determine
+// whether two values with the same key should be considered equal.
 type Attributes struct {
 	m map[interface{}]interface{}
 }
 
-// New returns a new Attributes containing all key/value pairs in kvs.  If the
-// same key appears multiple times, the last value overwrites all previous
-// values for that key.  Panics if len(kvs) is not even.
-func New(kvs ...interface{}) *Attributes {
-	if len(kvs)%2 != 0 {
-		panic(fmt.Sprintf("attributes.New called with unexpected input: len(kvs) = %v", len(kvs)))
-	}
-	a := &Attributes{m: make(map[interface{}]interface{}, len(kvs)/2)}
-	for i := 0; i < len(kvs)/2; i++ {
-		a.m[kvs[i*2]] = kvs[i*2+1]
-	}
-	return a
+// New returns a new Attributes containing the key/value pair.
+func New(key, value interface{}) *Attributes {
+	return &Attributes{m: map[interface{}]interface{}{key: value}}
 }
 
-// WithValues returns a new Attributes containing all key/value pairs in a and
-// kvs.  Panics if len(kvs) is not even.  If the same key appears multiple
-// times, the last value overwrites all previous values for that key.  To
-// remove an existing key, use a nil value.
-func (a *Attributes) WithValues(kvs ...interface{}) *Attributes {
+// WithValue returns a new Attributes containing the previous keys and values
+// and the new key/value pair.  If the same key appears multiple times, the
+// last value overwrites all previous values for that key.  To remove an
+// existing key, use a nil value.  value should not be modified later.
+func (a *Attributes) WithValue(key, value interface{}) *Attributes {
 	if a == nil {
-		return New(kvs...)
+		return New(key, value)
 	}
-	if len(kvs)%2 != 0 {
-		panic(fmt.Sprintf("attributes.New called with unexpected input: len(kvs) = %v", len(kvs)))
-	}
-	n := &Attributes{m: make(map[interface{}]interface{}, len(a.m)+len(kvs)/2)}
+	n := &Attributes{m: make(map[interface{}]interface{}, len(a.m)+1)}
 	for k, v := range a.m {
 		n.m[k] = v
 	}
-	for i := 0; i < len(kvs)/2; i++ {
-		n.m[kvs[i*2]] = kvs[i*2+1]
-	}
+	n.m[key] = value
 	return n
 }
 
 // Value returns the value associated with these attributes for key, or nil if
-// no value is associated with key.
+// no value is associated with key.  The returned value should not be modified.
 func (a *Attributes) Value(key interface{}) interface{} {
 	if a == nil {
 		return nil
 	}
 	return a.m[key]
 }
+
+// Equal returns whether a and o are equivalent.  If 'Equal(o interface{})
+// bool' is implemented for a value in the attributes, it is called to
+// determine if the value matches the one stored in the other attributes.  If
+// Equal is not implemented, standard equality is used to determine if the two
+// values are equal.
+func (a *Attributes) Equal(o *Attributes) bool {
+	if a == nil && o == nil {
+		return true
+	}
+	if a == nil || o == nil {
+		return false
+	}
+	if len(a.m) != len(o.m) {
+		return false
+	}
+	for k, v := range a.m {
+		ov, ok := o.m[k]
+		if !ok {
+			// o missing element of a
+			return false
+		}
+		if eq, ok := v.(interface{ Equal(o interface{}) bool }); ok {
+			if !eq.Equal(ov) {
+				return false
+			}
+		} else if v != ov {
+			// Fallback to a standard equality check if Value is unimplemented.
+			return false
+		}
+	}
+	return true
+}
diff --git a/vendor/google.golang.org/grpc/balancer/base/balancer.go b/vendor/google.golang.org/grpc/balancer/base/balancer.go
index 8dd504299..a67074a3a 100644
--- a/vendor/google.golang.org/grpc/balancer/base/balancer.go
+++ b/vendor/google.golang.org/grpc/balancer/base/balancer.go
@@ -22,7 +22,6 @@ import (
 	"errors"
 	"fmt"
 
-	"google.golang.org/grpc/attributes"
 	"google.golang.org/grpc/balancer"
 	"google.golang.org/grpc/connectivity"
 	"google.golang.org/grpc/grpclog"
@@ -42,7 +41,7 @@ func (bb *baseBuilder) Build(cc balancer.ClientConn, opt balancer.BuildOptions)
 		cc:            cc,
 		pickerBuilder: bb.pickerBuilder,
 
-		subConns: make(map[resolver.Address]subConnInfo),
+		subConns: resolver.NewAddressMap(),
 		scStates: make(map[balancer.SubConn]connectivity.State),
 		csEvltr:  &balancer.ConnectivityStateEvaluator{},
 		config:   bb.config,
@@ -58,11 +57,6 @@ 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
@@ -70,7 +64,7 @@ type baseBalancer struct {
 	csEvltr *balancer.ConnectivityStateEvaluator
 	state   connectivity.State
 
-	subConns map[resolver.Address]subConnInfo // `attributes` is stripped from the keys of this map (the addresses)
+	subConns *resolver.AddressMap
 	scStates map[balancer.SubConn]connectivity.State
 	picker   balancer.Picker
 	config   Config
@@ -81,7 +75,7 @@ type baseBalancer struct {
 
 func (b *baseBalancer) ResolverError(err error) {
 	b.resolverErr = err
-	if len(b.subConns) == 0 {
+	if b.subConns.Len() == 0 {
 		b.state = connectivity.TransientFailure
 	}
 
@@ -105,53 +99,29 @@ func (b *baseBalancer) UpdateClientConnState(s balancer.ClientConnState) error {
 	// Successful resolution; clear resolver error and ensure we return nil.
 	b.resolverErr = nil
 	// addrsSet is the set converted from addrs, it's used for quick lookup of an address.
-	addrsSet := make(map[resolver.Address]struct{})
+	addrsSet := resolver.NewAddressMap()
 	for _, a := range s.ResolverState.Addresses {
-		// 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 {
+		addrsSet.Set(a, nil)
+		if _, ok := b.subConns.Get(a); !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[aNoAttrs] = subConnInfo{subConn: sc, attrs: a.Attributes}
+			b.subConns.Set(a, sc)
 			b.scStates[sc] = connectivity.Idle
 			b.csEvltr.RecordTransition(connectivity.Shutdown, 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, scInfo := range b.subConns {
+	for _, a := range b.subConns.Keys() {
+		sci, _ := b.subConns.Get(a)
+		sc := sci.(balancer.SubConn)
 		// a was removed by resolver.
-		if _, ok := addrsSet[a]; !ok {
-			b.cc.RemoveSubConn(scInfo.subConn)
-			delete(b.subConns, a)
+		if _, ok := addrsSet.Get(a); !ok {
+			b.cc.RemoveSubConn(sc)
+			b.subConns.Delete(a)
 			// Keep the state of this sc in b.scStates until sc's state becomes Shutdown.
 			// The entry will be deleted in UpdateSubConnState.
 		}
@@ -193,10 +163,11 @@ func (b *baseBalancer) regeneratePicker() {
 	readySCs := make(map[balancer.SubConn]SubConnInfo)
 
 	// Filter out all ready SCs from full subConn map.
-	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}
+	for _, addr := range b.subConns.Keys() {
+		sci, _ := b.subConns.Get(addr)
+		sc := sci.(balancer.SubConn)
+		if st, ok := b.scStates[sc]; ok && st == connectivity.Ready {
+			readySCs[sc] = SubConnInfo{Address: addr}
 		}
 	}
 	b.picker = b.pickerBuilder.Build(PickerBuildInfo{ReadySCs: readySCs})
diff --git a/vendor/google.golang.org/grpc/balancer/grpclb/state/state.go b/vendor/google.golang.org/grpc/balancer/grpclb/state/state.go
index a24264a34..4ecfa1c21 100644
--- a/vendor/google.golang.org/grpc/balancer/grpclb/state/state.go
+++ b/vendor/google.golang.org/grpc/balancer/grpclb/state/state.go
@@ -39,7 +39,7 @@ type State struct {
 // Set returns a copy of the provided state with attributes containing s.  s's
 // data should not be mutated after calling Set.
 func Set(state resolver.State, s *State) resolver.State {
-	state.Attributes = state.Attributes.WithValues(key, s)
+	state.Attributes = state.Attributes.WithValue(key, s)
 	return state
 }
 
diff --git a/vendor/google.golang.org/grpc/clientconn.go b/vendor/google.golang.org/grpc/clientconn.go
index 34cc4c948..5a9e7d754 100644
--- a/vendor/google.golang.org/grpc/clientconn.go
+++ b/vendor/google.golang.org/grpc/clientconn.go
@@ -23,6 +23,7 @@ import (
 	"errors"
 	"fmt"
 	"math"
+	"net/url"
 	"reflect"
 	"strings"
 	"sync"
@@ -37,7 +38,6 @@ import (
 	"google.golang.org/grpc/internal/backoff"
 	"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"
@@ -248,38 +248,15 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 	}
 
 	// Determine the resolver to use.
-	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 {
-		// If resolver builder is still nil, the parsed target's scheme is
-		// not registered. Fallback to default resolver and set Endpoint to
-		// the original target.
-		channelz.Infof(logger, cc.channelzID, "scheme %q not registered, fallback to default scheme", cc.parsedTarget.Scheme)
-		cc.parsedTarget = resolver.Target{
-			Scheme:   resolver.GetDefaultScheme(),
-			Endpoint: target,
-		}
-		resolverBuilder = cc.getResolver(cc.parsedTarget.Scheme)
-		if resolverBuilder == nil {
-			return nil, fmt.Errorf("could not get resolver for default scheme: %q", cc.parsedTarget.Scheme)
-		}
+	resolverBuilder, err := cc.parseTargetAndFindResolver()
+	if err != nil {
+		return nil, err
 	}
-
-	creds := cc.dopts.copts.TransportCredentials
-	if creds != nil && creds.Info().ServerName != "" {
-		cc.authority = creds.Info().ServerName
-	} else if cc.dopts.insecure && cc.dopts.authority != "" {
-		cc.authority = cc.dopts.authority
-	} 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.
-		cc.authority = cc.parsedTarget.Endpoint
+	cc.authority, err = determineAuthority(cc.parsedTarget.Endpoint, cc.target, cc.dopts)
+	if err != nil {
+		return nil, err
 	}
+	channelz.Infof(logger, cc.channelzID, "Channel authority set to %q", cc.authority)
 
 	if cc.dopts.scChan != nil && !scSet {
 		// Blocking wait for the initial service config.
@@ -902,10 +879,7 @@ func (ac *addrConn) tryUpdateAddrs(addrs []resolver.Address) bool {
 	// ac.state is Ready, try to find the connected address.
 	var curAddrFound bool
 	for _, a := range addrs {
-		// a.ServerName takes precedent over ClientConn authority, if present.
-		if a.ServerName == "" {
-			a.ServerName = ac.cc.authority
-		}
+		a.ServerName = ac.cc.getServerName(a)
 		if reflect.DeepEqual(ac.curAddr, a) {
 			curAddrFound = true
 			break
@@ -919,6 +893,26 @@ func (ac *addrConn) tryUpdateAddrs(addrs []resolver.Address) bool {
 	return curAddrFound
 }
 
+// getServerName determines the serverName to be used in the connection
+// handshake. The default value for the serverName is the authority on the
+// ClientConn, which either comes from the user's dial target or through an
+// authority override specified using the WithAuthority dial option. Name
+// resolvers can specify a per-address override for the serverName through the
+// resolver.Address.ServerName field which is used only if the WithAuthority
+// dial option was not used. The rationale is that per-address authority
+// overrides specified by the name resolver can represent a security risk, while
+// an override specified by the user is more dependable since they probably know
+// what they are doing.
+func (cc *ClientConn) getServerName(addr resolver.Address) string {
+	if cc.dopts.authority != "" {
+		return cc.dopts.authority
+	}
+	if addr.ServerName != "" {
+		return addr.ServerName
+	}
+	return cc.authority
+}
+
 func getMethodConfig(sc *ServiceConfig, method string) MethodConfig {
 	if sc == nil {
 		return MethodConfig{}
@@ -1275,11 +1269,7 @@ func (ac *addrConn) createTransport(addr resolver.Address, copts transport.Conne
 	prefaceReceived := grpcsync.NewEvent()
 	connClosed := grpcsync.NewEvent()
 
-	// addr.ServerName takes precedent over ClientConn authority, if present.
-	if addr.ServerName == "" {
-		addr.ServerName = ac.cc.authority
-	}
-
+	addr.ServerName = ac.cc.getServerName(addr)
 	hctx, hcancel := context.WithCancel(ac.ctx)
 	hcStarted := false // protected by ac.mu
 
@@ -1621,3 +1611,114 @@ func (cc *ClientConn) connectionError() error {
 	defer cc.lceMu.Unlock()
 	return cc.lastConnectionError
 }
+
+func (cc *ClientConn) parseTargetAndFindResolver() (resolver.Builder, error) {
+	channelz.Infof(logger, cc.channelzID, "original dial target is: %q", cc.target)
+
+	var rb resolver.Builder
+	parsedTarget, err := parseTarget(cc.target)
+	if err != nil {
+		channelz.Infof(logger, cc.channelzID, "dial target %q parse failed: %v", cc.target, err)
+	} else {
+		channelz.Infof(logger, cc.channelzID, "parsed dial target is: %+v", parsedTarget)
+		rb = cc.getResolver(parsedTarget.Scheme)
+		if rb != nil {
+			cc.parsedTarget = parsedTarget
+			return rb, nil
+		}
+	}
+
+	// We are here because the user's dial target did not contain a scheme or
+	// specified an unregistered scheme. We should fallback to the default
+	// scheme, except when a custom dialer is specified in which case, we should
+	// always use passthrough scheme.
+	defScheme := resolver.GetDefaultScheme()
+	channelz.Infof(logger, cc.channelzID, "fallback to scheme %q", defScheme)
+	canonicalTarget := defScheme + ":///" + cc.target
+
+	parsedTarget, err = parseTarget(canonicalTarget)
+	if err != nil {
+		channelz.Infof(logger, cc.channelzID, "dial target %q parse failed: %v", canonicalTarget, err)
+		return nil, err
+	}
+	channelz.Infof(logger, cc.channelzID, "parsed dial target is: %+v", parsedTarget)
+	rb = cc.getResolver(parsedTarget.Scheme)
+	if rb == nil {
+		return nil, fmt.Errorf("could not get resolver for default scheme: %q", parsedTarget.Scheme)
+	}
+	cc.parsedTarget = parsedTarget
+	return rb, nil
+}
+
+// parseTarget uses RFC 3986 semantics to parse the given target into a
+// resolver.Target struct containing scheme, authority and endpoint. Query
+// params are stripped from the endpoint.
+func parseTarget(target string) (resolver.Target, error) {
+	u, err := url.Parse(target)
+	if err != nil {
+		return resolver.Target{}, err
+	}
+	// For targets of the form "[scheme]://[authority]/endpoint, the endpoint
+	// value returned from url.Parse() contains a leading "/". Although this is
+	// in accordance with RFC 3986, we do not want to break existing resolver
+	// implementations which expect the endpoint without the leading "/". So, we
+	// end up stripping the leading "/" here. But this will result in an
+	// incorrect parsing for something like "unix:///path/to/socket". Since we
+	// own the "unix" resolver, we can workaround in the unix resolver by using
+	// the `URL` field instead of the `Endpoint` field.
+	endpoint := u.Path
+	if endpoint == "" {
+		endpoint = u.Opaque
+	}
+	endpoint = strings.TrimPrefix(endpoint, "/")
+	return resolver.Target{
+		Scheme:    u.Scheme,
+		Authority: u.Host,
+		Endpoint:  endpoint,
+		URL:       *u,
+	}, nil
+}
+
+// Determine channel authority. The order of precedence is as follows:
+// - user specified authority override using `WithAuthority` dial option
+// - creds' notion of server name for the authentication handshake
+// - endpoint from dial target of the form "scheme://[authority]/endpoint"
+func determineAuthority(endpoint, target string, dopts dialOptions) (string, error) {
+	// Historically, we had two options for users to specify the serverName or
+	// authority for a channel. One was through the transport credentials
+	// (either in its constructor, or through the OverrideServerName() method).
+	// The other option (for cases where WithInsecure() dial option was used)
+	// was to use the WithAuthority() dial option.
+	//
+	// A few things have changed since:
+	// - `insecure` package with an implementation of the `TransportCredentials`
+	//   interface for the insecure case
+	// - WithAuthority() dial option support for secure credentials
+	authorityFromCreds := ""
+	if creds := dopts.copts.TransportCredentials; creds != nil && creds.Info().ServerName != "" {
+		authorityFromCreds = creds.Info().ServerName
+	}
+	authorityFromDialOption := dopts.authority
+	if (authorityFromCreds != "" && authorityFromDialOption != "") && authorityFromCreds != authorityFromDialOption {
+		return "", fmt.Errorf("ClientConn's authority from transport creds %q and dial option %q don't match", authorityFromCreds, authorityFromDialOption)
+	}
+
+	switch {
+	case authorityFromDialOption != "":
+		return authorityFromDialOption, nil
+	case authorityFromCreds != "":
+		return authorityFromCreds, nil
+	case strings.HasPrefix(target, "unix:") || strings.HasPrefix(target, "unix-abstract:"):
+		// TODO: remove when the unix resolver implements optional interface to
+		// return channel authority.
+		return "localhost", nil
+	case strings.HasPrefix(endpoint, ":"):
+		return "localhost" + endpoint, nil
+	default:
+		// TODO: Define an optional interface on the resolver builder to return
+		// the channel authority given the user's dial target. For resolvers
+		// which don't implement this interface, we will use the endpoint from
+		// "scheme://authority/endpoint" as the default authority.
+		return endpoint, nil
+	}
+}
diff --git a/vendor/google.golang.org/grpc/credentials/credentials.go b/vendor/google.golang.org/grpc/credentials/credentials.go
index 7eee7e4ec..a67110758 100644
--- a/vendor/google.golang.org/grpc/credentials/credentials.go
+++ b/vendor/google.golang.org/grpc/credentials/credentials.go
@@ -140,6 +140,11 @@ type TransportCredentials interface {
 	// Additionally, ClientHandshakeInfo data will be available via the context
 	// passed to this call.
 	//
+	// The second argument to this method is the `:authority` header value used
+	// while creating new streams on this connection after authentication
+	// succeeds. Implementations must use this as the server name during the
+	// authentication handshake.
+	//
 	// If the returned net.Conn is closed, it MUST close the net.Conn provided.
 	ClientHandshake(context.Context, string, net.Conn) (net.Conn, AuthInfo, error)
 	// ServerHandshake does the authentication handshake for servers. It returns
@@ -153,9 +158,13 @@ type TransportCredentials interface {
 	Info() ProtocolInfo
 	// Clone makes a copy of this TransportCredentials.
 	Clone() TransportCredentials
-	// OverrideServerName overrides the server name used to verify the hostname on the returned certificates from the server.
-	// gRPC internals also use it to override the virtual hosting name if it is set.
-	// It must be called before dialing. Currently, this is only used by grpclb.
+	// OverrideServerName specifies the value used for the following:
+	// - verifying the hostname on the returned certificates
+	// - as SNI in the client's handshake to support virtual hosting
+	// - as the value for `:authority` header at stream creation time
+	//
+	// Deprecated: use grpc.WithAuthority instead. Will be supported
+	// throughout 1.x.
 	OverrideServerName(string) error
 }
 
diff --git a/vendor/google.golang.org/grpc/dialoptions.go b/vendor/google.golang.org/grpc/dialoptions.go
index 7a497237b..40d8ba659 100644
--- a/vendor/google.golang.org/grpc/dialoptions.go
+++ b/vendor/google.golang.org/grpc/dialoptions.go
@@ -482,8 +482,7 @@ func WithChainStreamInterceptor(interceptors ...StreamClientInterceptor) DialOpt
 }
 
 // WithAuthority returns a DialOption that specifies the value to be used as the
-// :authority pseudo-header. This value only works with WithInsecure and has no
-// effect if TransportCredentials are present.
+// :authority pseudo-header and as the server name in authentication handshake.
 func WithAuthority(a string) DialOption {
 	return newFuncDialOption(func(o *dialOptions) {
 		o.authority = a
@@ -519,14 +518,16 @@ func WithDisableServiceConfig() DialOption {
 // WithDefaultServiceConfig returns a DialOption that configures the default
 // service config, which will be used in cases where:
 //
-// 1. WithDisableServiceConfig is also used.
-// 2. Resolver does not return a service config or if the resolver returns an
-//    invalid service config.
+// 1. WithDisableServiceConfig is also used, or
 //
-// Experimental
+// 2. The name resolver does not provide a service config or provides an
+// invalid service config.
 //
-// Notice: This API is EXPERIMENTAL and may be changed or removed in a
-// later release.
+// The parameter s is the JSON representation of the default service config.
+// For more information about service configs, see:
+// https://github.com/grpc/grpc/blob/master/doc/service_config.md
+// For a simple example of usage, see:
+// examples/features/load_balancing/client/main.go
 func WithDefaultServiceConfig(s string) DialOption {
 	return newFuncDialOption(func(o *dialOptions) {
 		o.defaultServiceConfigRawJSON = &s
@@ -538,14 +539,8 @@ func WithDefaultServiceConfig(s string) DialOption {
 // will happen automatically if no data is written to the wire or if the RPC is
 // unprocessed by the remote server.
 //
-// Retry support is currently disabled by default, but will be enabled by
-// default in the future.  Until then, it may be enabled by setting the
-// environment variable "GRPC_GO_RETRY" to "on".
-//
-// Experimental
-//
-// Notice: This API is EXPERIMENTAL and may be changed or removed in a
-// later release.
+// Retry support is currently enabled by default, but may be disabled by
+// setting the environment variable "GRPC_GO_RETRY" to "off".
 func WithDisableRetry() DialOption {
 	return newFuncDialOption(func(o *dialOptions) {
 		o.disableRetry = true
diff --git a/vendor/google.golang.org/grpc/go.mod b/vendor/google.golang.org/grpc/go.mod
index 022cc9828..fcffdceef 100644
--- a/vendor/google.golang.org/grpc/go.mod
+++ b/vendor/google.golang.org/grpc/go.mod
@@ -4,7 +4,8 @@ go 1.14
 
 require (
 	github.com/cespare/xxhash/v2 v2.1.1
-	github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403
+	github.com/cncf/udpa/go v0.0.0-20210930031921-04548b0d99d4
+	github.com/cncf/xds/go v0.0.0-20211011173535-cb28da3451f1
 	github.com/envoyproxy/go-control-plane v0.9.10-0.20210907150352-cf90f659a021
 	github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
 	github.com/golang/protobuf v1.4.3
diff --git a/vendor/google.golang.org/grpc/go.sum b/vendor/google.golang.org/grpc/go.sum
index 6e7ae0db2..8b542e0be 100644
--- a/vendor/google.golang.org/grpc/go.sum
+++ b/vendor/google.golang.org/grpc/go.sum
@@ -9,10 +9,13 @@ github.com/cespare/xxhash/v2 v2.1.1 h1:6MnRN8NT7+YBpUIWxHtefFZOKTAPgGjpQSxqLNn0+
 github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 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/cncf/xds/go v0.0.0-20210805033703-aa0b78936158 h1:CevA8fI91PAnP8vpnXuB8ZYAZ5wqY86nAbxfgK8tWO4=
+github.com/cncf/udpa/go v0.0.0-20210930031921-04548b0d99d4 h1:hzAQntlaYRkVSFEfj9OTWlVV1H155FMD8BTKktLv0QI=
+github.com/cncf/udpa/go v0.0.0-20210930031921-04548b0d99d4/go.mod h1:6pvJx4me5XPnfI9Z40ddWsdw2W/uZgQLFXToKeRcDiI=
 github.com/cncf/xds/go v0.0.0-20210805033703-aa0b78936158/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
+github.com/cncf/xds/go v0.0.0-20210922020428-25de7278fc84/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
+github.com/cncf/xds/go v0.0.0-20211011173535-cb28da3451f1 h1:zH8ljVhhq7yC0MIeUL/IviMtY8hx2mK8cN9wEYb8ggw=
+github.com/cncf/xds/go v0.0.0-20211011173535-cb28da3451f1/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
 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=
diff --git a/vendor/google.golang.org/grpc/grpclog/loggerv2.go b/vendor/google.golang.org/grpc/grpclog/loggerv2.go
index 4ee33171e..34098bb8e 100644
--- a/vendor/google.golang.org/grpc/grpclog/loggerv2.go
+++ b/vendor/google.golang.org/grpc/grpclog/loggerv2.go
@@ -19,11 +19,14 @@
 package grpclog
 
 import (
+	"encoding/json"
+	"fmt"
 	"io"
 	"io/ioutil"
 	"log"
 	"os"
 	"strconv"
+	"strings"
 
 	"google.golang.org/grpc/internal/grpclog"
 )
@@ -95,8 +98,9 @@ var severityName = []string{
 
 // loggerT is the default logger used by grpclog.
 type loggerT struct {
-	m []*log.Logger
-	v int
+	m          []*log.Logger
+	v          int
+	jsonFormat bool
 }
 
 // NewLoggerV2 creates a loggerV2 with the provided writers.
@@ -105,19 +109,32 @@ type loggerT struct {
 // Warning logs will be written to warningW and infoW.
 // Info logs will be written to infoW.
 func NewLoggerV2(infoW, warningW, errorW io.Writer) LoggerV2 {
-	return NewLoggerV2WithVerbosity(infoW, warningW, errorW, 0)
+	return newLoggerV2WithConfig(infoW, warningW, errorW, loggerV2Config{})
 }
 
 // NewLoggerV2WithVerbosity creates a loggerV2 with the provided writers and
 // verbosity level.
 func NewLoggerV2WithVerbosity(infoW, warningW, errorW io.Writer, v int) LoggerV2 {
+	return newLoggerV2WithConfig(infoW, warningW, errorW, loggerV2Config{verbose: v})
+}
+
+type loggerV2Config struct {
+	verbose    int
+	jsonFormat bool
+}
+
+func newLoggerV2WithConfig(infoW, warningW, errorW io.Writer, c loggerV2Config) LoggerV2 {
 	var m []*log.Logger
-	m = append(m, log.New(infoW, severityName[infoLog]+": ", log.LstdFlags))
-	m = append(m, log.New(io.MultiWriter(infoW, warningW), severityName[warningLog]+": ", log.LstdFlags))
+	flag := log.LstdFlags
+	if c.jsonFormat {
+		flag = 0
+	}
+	m = append(m, log.New(infoW, "", flag))
+	m = append(m, log.New(io.MultiWriter(infoW, warningW), "", flag))
 	ew := io.MultiWriter(infoW, warningW, errorW) // ew will be used for error and fatal.
-	m = append(m, log.New(ew, severityName[errorLog]+": ", log.LstdFlags))
-	m = append(m, log.New(ew, severityName[fatalLog]+": ", log.LstdFlags))
-	return &loggerT{m: m, v: v}
+	m = append(m, log.New(ew, "", flag))
+	m = append(m, log.New(ew, "", flag))
+	return &loggerT{m: m, v: c.verbose, jsonFormat: c.jsonFormat}
 }
 
 // newLoggerV2 creates a loggerV2 to be used as default logger.
@@ -142,58 +159,79 @@ func newLoggerV2() LoggerV2 {
 	if vl, err := strconv.Atoi(vLevel); err == nil {
 		v = vl
 	}
-	return NewLoggerV2WithVerbosity(infoW, warningW, errorW, v)
+
+	jsonFormat := strings.EqualFold(os.Getenv("GRPC_GO_LOG_FORMATTER"), "json")
+
+	return newLoggerV2WithConfig(infoW, warningW, errorW, loggerV2Config{
+		verbose:    v,
+		jsonFormat: jsonFormat,
+	})
+}
+
+func (g *loggerT) output(severity int, s string) {
+	sevStr := severityName[severity]
+	if !g.jsonFormat {
+		g.m[severity].Output(2, fmt.Sprintf("%v: %v", sevStr, s))
+		return
+	}
+	// TODO: we can also include the logging component, but that needs more
+	// (API) changes.
+	b, _ := json.Marshal(map[string]string{
+		"severity": sevStr,
+		"message":  s,
+	})
+	g.m[severity].Output(2, string(b))
 }
 
 func (g *loggerT) Info(args ...interface{}) {
-	g.m[infoLog].Print(args...)
+	g.output(infoLog, fmt.Sprint(args...))
 }
 
 func (g *loggerT) Infoln(args ...interface{}) {
-	g.m[infoLog].Println(args...)
+	g.output(infoLog, fmt.Sprintln(args...))
 }
 
 func (g *loggerT) Infof(format string, args ...interface{}) {
-	g.m[infoLog].Printf(format, args...)
+	g.output(infoLog, fmt.Sprintf(format, args...))
 }
 
 func (g *loggerT) Warning(args ...interface{}) {
-	g.m[warningLog].Print(args...)
+	g.output(warningLog, fmt.Sprint(args...))
 }
 
 func (g *loggerT) Warningln(args ...interface{}) {
-	g.m[warningLog].Println(args...)
+	g.output(warningLog, fmt.Sprintln(args...))
 }
 
 func (g *loggerT) Warningf(format string, args ...interface{}) {
-	g.m[warningLog].Printf(format, args...)
+	g.output(warningLog, fmt.Sprintf(format, args...))
 }
 
 func (g *loggerT) Error(args ...interface{}) {
-	g.m[errorLog].Print(args...)
+	g.output(errorLog, fmt.Sprint(args...))
 }
 
 func (g *loggerT) Errorln(args ...interface{}) {
-	g.m[errorLog].Println(args...)
+	g.output(errorLog, fmt.Sprintln(args...))
 }
 
 func (g *loggerT) Errorf(format string, args ...interface{}) {
-	g.m[errorLog].Printf(format, args...)
+	g.output(errorLog, fmt.Sprintf(format, args...))
 }
 
 func (g *loggerT) Fatal(args ...interface{}) {
-	g.m[fatalLog].Fatal(args...)
-	// No need to call os.Exit() again because log.Logger.Fatal() calls os.Exit().
+	g.output(fatalLog, fmt.Sprint(args...))
+	os.Exit(1)
 }
 
 func (g *loggerT) Fatalln(args ...interface{}) {
-	g.m[fatalLog].Fatalln(args...)
-	// No need to call os.Exit() again because log.Logger.Fatal() calls os.Exit().
+	g.output(fatalLog, fmt.Sprintln(args...))
+	os.Exit(1)
 }
 
 func (g *loggerT) Fatalf(format string, args ...interface{}) {
-	g.m[fatalLog].Fatalf(format, args...)
-	// No need to call os.Exit() again because log.Logger.Fatal() calls os.Exit().
+	g.output(fatalLog, fmt.Sprintf(format, args...))
+	os.Exit(1)
 }
 
 func (g *loggerT) V(l int) bool {
diff --git a/vendor/google.golang.org/grpc/internal/envconfig/envconfig.go b/vendor/google.golang.org/grpc/internal/envconfig/envconfig.go
index e766ac04a..9f25a67fc 100644
--- a/vendor/google.golang.org/grpc/internal/envconfig/envconfig.go
+++ b/vendor/google.golang.org/grpc/internal/envconfig/envconfig.go
@@ -33,8 +33,9 @@ const (
 )
 
 var (
-	// Retry is set if retry is explicitly enabled via "GRPC_GO_RETRY=on" or if XDS retry support is enabled.
-	Retry = strings.EqualFold(os.Getenv(retryStr), "on") || xdsenv.RetrySupport
+	// Retry is enabled unless explicitly disabled via "GRPC_GO_RETRY=off" or
+	// if XDS retry support is explicitly disabled.
+	Retry = !strings.EqualFold(os.Getenv(retryStr), "off") && xdsenv.RetrySupport
 	// TXTErrIgnore is set if TXT errors should be ignored ("GRPC_GO_IGNORE_TXT_ERRORS" is not "false").
 	TXTErrIgnore = !strings.EqualFold(os.Getenv(txtErrIgnoreStr), "false")
 )
diff --git a/vendor/google.golang.org/grpc/internal/grpcutil/grpcutil.go b/vendor/google.golang.org/grpc/internal/grpcutil/grpcutil.go
new file mode 100644
index 000000000..e2f948e8f
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/grpcutil/grpcutil.go
@@ -0,0 +1,20 @@
+/*
+ *
+ * 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 grpcutil provides utility functions used across the gRPC codebase.
+package grpcutil
diff --git a/vendor/google.golang.org/grpc/internal/grpcutil/regex.go b/vendor/google.golang.org/grpc/internal/grpcutil/regex.go
new file mode 100644
index 000000000..2810a8ba2
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/grpcutil/regex.go
@@ -0,0 +1,28 @@
+/*
+ *
+ * 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 grpcutil
+
+import "regexp"
+
+// FullMatchWithRegex returns whether the full string matches the regex provided.
+func FullMatchWithRegex(re *regexp.Regexp, string string) bool {
+	re.Longest()
+	rem := re.FindString(string)
+	return len(rem) == len(string)
+}
diff --git a/vendor/google.golang.org/grpc/internal/grpcutil/target.go b/vendor/google.golang.org/grpc/internal/grpcutil/target.go
deleted file mode 100644
index 8833021da..000000000
--- a/vendor/google.golang.org/grpc/internal/grpcutil/target.go
+++ /dev/null
@@ -1,89 +0,0 @@
-/*
- *
- * 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 grpcutil provides a bunch of utility functions to be used across the
-// gRPC codebase.
-package grpcutil
-
-import (
-	"strings"
-
-	"google.golang.org/grpc/resolver"
-)
-
-// split2 returns the values from strings.SplitN(s, sep, 2).
-// If sep is not found, it returns ("", "", false) instead.
-func split2(s, sep string) (string, string, bool) {
-	spl := strings.SplitN(s, sep, 2)
-	if len(spl) < 2 {
-		return "", "", false
-	}
-	return spl[0], spl[1], true
-}
-
-// ParseTarget splits target into a resolver.Target struct containing scheme,
-// 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 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/metadata/metadata.go b/vendor/google.golang.org/grpc/internal/metadata/metadata.go
index 302262613..b8733dbf3 100644
--- a/vendor/google.golang.org/grpc/internal/metadata/metadata.go
+++ b/vendor/google.golang.org/grpc/internal/metadata/metadata.go
@@ -30,14 +30,38 @@ type mdKeyType string
 
 const mdKey = mdKeyType("grpc.internal.address.metadata")
 
+type mdValue metadata.MD
+
+func (m mdValue) Equal(o interface{}) bool {
+	om, ok := o.(mdValue)
+	if !ok {
+		return false
+	}
+	if len(m) != len(om) {
+		return false
+	}
+	for k, v := range m {
+		ov := om[k]
+		if len(ov) != len(v) {
+			return false
+		}
+		for i, ve := range v {
+			if ov[i] != ve {
+				return false
+			}
+		}
+	}
+	return true
+}
+
 // 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
+	md, _ := attrs.Value(mdKey).(mdValue)
+	return metadata.MD(md)
 }
 
 // Set sets (overrides) the metadata in addr.
@@ -45,6 +69,6 @@ func Get(addr resolver.Address) metadata.MD {
 // 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)
+	addr.Attributes = addr.Attributes.WithValue(mdKey, mdValue(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
index be7e13d58..c7a18a948 100644
--- a/vendor/google.golang.org/grpc/internal/resolver/config_selector.go
+++ b/vendor/google.golang.org/grpc/internal/resolver/config_selector.go
@@ -132,7 +132,7 @@ 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)
+	state.Attributes = state.Attributes.WithValue(csKey, cs)
 	return state
 }
 
diff --git a/vendor/google.golang.org/grpc/internal/resolver/unix/unix.go b/vendor/google.golang.org/grpc/internal/resolver/unix/unix.go
index 0d5a811dd..20852e59d 100644
--- a/vendor/google.golang.org/grpc/internal/resolver/unix/unix.go
+++ b/vendor/google.golang.org/grpc/internal/resolver/unix/unix.go
@@ -37,7 +37,17 @@ func (b *builder) Build(target resolver.Target, cc resolver.ClientConn, _ resolv
 	if target.Authority != "" {
 		return nil, fmt.Errorf("invalid (non-empty) authority: %v", target.Authority)
 	}
-	addr := resolver.Address{Addr: target.Endpoint}
+
+	// gRPC was parsing the dial target manually before PR #4817, and we
+	// switched to using url.Parse() in that PR. To avoid breaking existing
+	// resolver implementations we ended up stripping the leading "/" from the
+	// endpoint. This obviously does not work for the "unix" scheme. Hence we
+	// end up using the parsed URL instead.
+	endpoint := target.URL.Path
+	if endpoint == "" {
+		endpoint = target.URL.Opaque
+	}
+	addr := resolver.Address{Addr: endpoint}
 	if b.scheme == unixAbstractScheme {
 		// prepend "\x00" to address for unix-abstract
 		addr.Addr = "\x00" + addr.Addr
diff --git a/vendor/google.golang.org/grpc/internal/transport/controlbuf.go b/vendor/google.golang.org/grpc/internal/transport/controlbuf.go
index 45532f8ae..8394d252d 100644
--- a/vendor/google.golang.org/grpc/internal/transport/controlbuf.go
+++ b/vendor/google.golang.org/grpc/internal/transport/controlbuf.go
@@ -133,6 +133,7 @@ type cleanupStream struct {
 func (c *cleanupStream) isTransportResponseFrame() bool { return c.rst } // Results in a RST_STREAM
 
 type earlyAbortStream struct {
+	httpStatus     uint32
 	streamID       uint32
 	contentSubtype string
 	status         *status.Status
@@ -771,9 +772,12 @@ func (l *loopyWriter) earlyAbortStreamHandler(eas *earlyAbortStream) error {
 	if l.side == clientSide {
 		return errors.New("earlyAbortStream not handled on client")
 	}
-
+	// In case the caller forgets to set the http status, default to 200.
+	if eas.httpStatus == 0 {
+		eas.httpStatus = 200
+	}
 	headerFields := []hpack.HeaderField{
-		{Name: ":status", Value: "200"},
+		{Name: ":status", Value: strconv.Itoa(int(eas.httpStatus))},
 		{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())},
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 755863074..2521a7d7a 100644
--- a/vendor/google.golang.org/grpc/internal/transport/http2_client.go
+++ b/vendor/google.golang.org/grpc/internal/transport/http2_client.go
@@ -25,6 +25,7 @@ import (
 	"math"
 	"net"
 	"net/http"
+	"path/filepath"
 	"strconv"
 	"strings"
 	"sync"
@@ -146,13 +147,20 @@ func dial(ctx context.Context, fn func(context.Context, string) (net.Conn, error
 	address := addr.Addr
 	networkType, ok := networktype.Get(addr)
 	if fn != nil {
+		// Special handling for unix scheme with custom dialer. Back in the day,
+		// we did not have a unix resolver and therefore targets with a unix
+		// scheme would end up using the passthrough resolver. So, user's used a
+		// custom dialer in this case and expected the original dial target to
+		// be passed to the custom dialer. Now, we have a unix resolver. But if
+		// a custom dialer is specified, we want to retain the old behavior in
+		// terms of the address being passed to the custom dialer.
 		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)
+			// Supported unix targets are either "unix://absolute-path" or
+			// "unix:relative-path".
+			if filepath.IsAbs(address) {
+				return fn(ctx, "unix://"+address)
+			}
+			return fn(ctx, "unix:"+address)
 		}
 		return fn(ctx, address)
 	}
@@ -1073,7 +1081,7 @@ func (t *http2Client) handleData(f *http2.DataFrame) {
 	}
 	// The server has closed the stream without sending trailers.  Record that
 	// the read direction is closed, and set the status appropriately.
-	if f.FrameHeader.Flags.Has(http2.FlagDataEndStream) {
+	if f.StreamEnded() {
 		t.closeStream(s, io.EOF, false, http2.ErrCodeNo, status.New(codes.Internal, "server closed the stream without sending trailers"), nil, true)
 	}
 }
@@ -1403,26 +1411,6 @@ func (t *http2Client) operateHeaders(frame *http2.MetaHeadersFrame) {
 	}
 
 	isHeader := false
-	defer func() {
-		if t.statsHandler != nil {
-			if isHeader {
-				inHeader := &stats.InHeader{
-					Client:      true,
-					WireLength:  int(frame.Header().Length),
-					Header:      s.header.Copy(),
-					Compression: s.recvCompress,
-				}
-				t.statsHandler.HandleRPC(s.ctx, inHeader)
-			} else {
-				inTrailer := &stats.InTrailer{
-					Client:     true,
-					WireLength: int(frame.Header().Length),
-					Trailer:    s.trailer.Copy(),
-				}
-				t.statsHandler.HandleRPC(s.ctx, inTrailer)
-			}
-		}
-	}()
 
 	// If headerChan hasn't been closed yet
 	if atomic.CompareAndSwapUint32(&s.headerChanClosed, 0, 1) {
@@ -1444,6 +1432,25 @@ func (t *http2Client) operateHeaders(frame *http2.MetaHeadersFrame) {
 		close(s.headerChan)
 	}
 
+	if t.statsHandler != nil {
+		if isHeader {
+			inHeader := &stats.InHeader{
+				Client:      true,
+				WireLength:  int(frame.Header().Length),
+				Header:      metadata.MD(mdata).Copy(),
+				Compression: s.recvCompress,
+			}
+			t.statsHandler.HandleRPC(s.ctx, inHeader)
+		} else {
+			inTrailer := &stats.InTrailer{
+				Client:     true,
+				WireLength: int(frame.Header().Length),
+				Trailer:    metadata.MD(mdata).Copy(),
+			}
+			t.statsHandler.HandleRPC(s.ctx, inTrailer)
+		}
+	}
+
 	if !endStream {
 		return
 	}
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 19c13e041..f2cad9ebc 100644
--- a/vendor/google.golang.org/grpc/internal/transport/http2_server.go
+++ b/vendor/google.golang.org/grpc/internal/transport/http2_server.go
@@ -129,7 +129,7 @@ type http2Server struct {
 // options from config.
 //
 // It returns a non-nil transport and a nil error on success. On failure, it
-// returns a non-nil transport and a nil-error. For a special case where the
+// returns a nil transport and a non-nil error. For a special case where the
 // underlying conn gets closed before the client preface could be read, it
 // returns a nil transport and a nil error.
 func NewServerTransport(conn net.Conn, config *ServerConfig) (_ ServerTransport, err error) {
@@ -290,10 +290,11 @@ func NewServerTransport(conn net.Conn, config *ServerConfig) (_ ServerTransport,
 	if _, err := io.ReadFull(t.conn, preface); err != nil {
 		// In deployments where a gRPC server runs behind a cloud load balancer
 		// which performs regular TCP level health checks, the connection is
-		// closed immediately by the latter. Skipping the error here will help
-		// reduce log clutter.
+		// closed immediately by the latter.  Returning io.EOF here allows the
+		// grpc server implementation to recognize this scenario and suppress
+		// logging to reduce spam.
 		if err == io.EOF {
-			return nil, nil
+			return nil, io.EOF
 		}
 		return nil, connectionErrorf(false, err, "transport: http2Server.HandleStreams failed to receive the preface from client: %v", err)
 	}
@@ -390,6 +391,13 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 			if timeout, err = decodeTimeout(hf.Value); err != nil {
 				headerError = true
 			}
+		// "Transports must consider requests containing the Connection header
+		// as malformed." - A41
+		case "connection":
+			if logger.V(logLevel) {
+				logger.Errorf("transport: http2Server.operateHeaders parsed a :connection header which makes a request malformed as per the HTTP/2 spec")
+			}
+			headerError = true
 		default:
 			if isReservedHeader(hf.Name) && !isWhitelistedHeader(hf.Name) {
 				break
@@ -404,6 +412,25 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 		}
 	}
 
+	// "If multiple Host headers or multiple :authority headers are present, the
+	// request must be rejected with an HTTP status code 400 as required by Host
+	// validation in RFC 7230 §5.4, gRPC status code INTERNAL, or RST_STREAM
+	// with HTTP/2 error code PROTOCOL_ERROR." - A41. Since this is a HTTP/2
+	// error, this takes precedence over a client not speaking gRPC.
+	if len(mdata[":authority"]) > 1 || len(mdata["host"]) > 1 {
+		errMsg := fmt.Sprintf("num values of :authority: %v, num values of host: %v, both must only have 1 value as per HTTP/2 spec", len(mdata[":authority"]), len(mdata["host"]))
+		if logger.V(logLevel) {
+			logger.Errorf("transport: %v", errMsg)
+		}
+		t.controlBuf.put(&earlyAbortStream{
+			httpStatus:     400,
+			streamID:       streamID,
+			contentSubtype: s.contentSubtype,
+			status:         status.New(codes.Internal, errMsg),
+		})
+		return false
+	}
+
 	if !isGRPC || headerError {
 		t.controlBuf.put(&cleanupStream{
 			streamID: streamID,
@@ -414,6 +441,19 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 		return false
 	}
 
+	// "If :authority is missing, Host must be renamed to :authority." - A41
+	if len(mdata[":authority"]) == 0 {
+		// No-op if host isn't present, no eventual :authority header is a valid
+		// RPC.
+		if host, ok := mdata["host"]; ok {
+			mdata[":authority"] = host
+			delete(mdata, "host")
+		}
+	} else {
+		// "If :authority is present, Host must be discarded" - A41
+		delete(mdata, "host")
+	}
+
 	if frame.StreamEnded() {
 		// s is just created by the caller. No lock needed.
 		s.state = streamReadDone
@@ -494,6 +534,7 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 				stat = status.New(codes.PermissionDenied, err.Error())
 			}
 			t.controlBuf.put(&earlyAbortStream{
+				httpStatus:     200,
 				streamID:       s.id,
 				contentSubtype: s.contentSubtype,
 				status:         stat,
@@ -734,7 +775,7 @@ func (t *http2Server) handleData(f *http2.DataFrame) {
 			s.write(recvMsg{buffer: buffer})
 		}
 	}
-	if f.Header().Flags.Has(http2.FlagDataEndStream) {
+	if f.StreamEnded() {
 		// Received the end of stream from the client.
 		s.compareAndSwapState(streamActive, streamReadDone)
 		s.write(recvMsg{err: io.EOF})
diff --git a/vendor/google.golang.org/grpc/internal/transport/networktype/networktype.go b/vendor/google.golang.org/grpc/internal/transport/networktype/networktype.go
index 7bb53cff1..c11b52782 100644
--- a/vendor/google.golang.org/grpc/internal/transport/networktype/networktype.go
+++ b/vendor/google.golang.org/grpc/internal/transport/networktype/networktype.go
@@ -31,7 +31,7 @@ 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)
+	address.Attributes = address.Attributes.WithValue(key, networkType)
 	return address
 }
 
diff --git a/vendor/google.golang.org/grpc/internal/xds/env/env.go b/vendor/google.golang.org/grpc/internal/xds/env/env.go
index b171ac91f..87d3c2433 100644
--- a/vendor/google.golang.org/grpc/internal/xds/env/env.go
+++ b/vendor/google.golang.org/grpc/internal/xds/env/env.go
@@ -43,7 +43,7 @@ const (
 	clientSideSecuritySupportEnv = "GRPC_XDS_EXPERIMENTAL_SECURITY_SUPPORT"
 	aggregateAndDNSSupportEnv    = "GRPC_XDS_EXPERIMENTAL_ENABLE_AGGREGATE_AND_LOGICAL_DNS_CLUSTER"
 	retrySupportEnv              = "GRPC_XDS_EXPERIMENTAL_ENABLE_RETRY"
-	rbacSupportEnv               = "GRPC_XDS_EXPERIMENTAL_ENABLE_RBAC"
+	rbacSupportEnv               = "GRPC_XDS_EXPERIMENTAL_RBAC"
 
 	c2pResolverSupportEnv                    = "GRPC_EXPERIMENTAL_GOOGLE_C2P_RESOLVER"
 	c2pResolverTestOnlyTrafficDirectorURIEnv = "GRPC_TEST_ONLY_GOOGLE_C2P_RESOLVER_TRAFFIC_DIRECTOR_URI"
@@ -83,8 +83,10 @@ var (
 	// RetrySupport indicates whether xDS retry is enabled.
 	RetrySupport = !strings.EqualFold(os.Getenv(retrySupportEnv), "false")
 
-	// RBACSupport indicates whether xDS configured RBAC HTTP Filter is enabled.
-	RBACSupport = strings.EqualFold(os.Getenv(rbacSupportEnv), "true")
+	// RBACSupport indicates whether xDS configured RBAC HTTP Filter is enabled,
+	// which can be disabled by setting the environment variable
+	// "GRPC_XDS_EXPERIMENTAL_RBAC" to "false".
+	RBACSupport = !strings.EqualFold(os.Getenv(rbacSupportEnv), "false")
 
 	// C2PResolverSupport indicates whether support for C2P resolver is enabled.
 	// This can be enabled by setting the environment variable
diff --git a/vendor/google.golang.org/grpc/internal/xds_handshake_cluster.go b/vendor/google.golang.org/grpc/internal/xds_handshake_cluster.go
index 3677c3f04..e8b492774 100644
--- a/vendor/google.golang.org/grpc/internal/xds_handshake_cluster.go
+++ b/vendor/google.golang.org/grpc/internal/xds_handshake_cluster.go
@@ -28,7 +28,7 @@ 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)
+	addr.Attributes = addr.Attributes.WithValue(handshakeClusterNameKey{}, clusterName)
 	return addr
 }
 
diff --git a/vendor/google.golang.org/grpc/picker_wrapper.go b/vendor/google.golang.org/grpc/picker_wrapper.go
index 0878ada9d..e8367cb89 100644
--- a/vendor/google.golang.org/grpc/picker_wrapper.go
+++ b/vendor/google.golang.org/grpc/picker_wrapper.go
@@ -144,7 +144,7 @@ func (pw *pickerWrapper) pick(ctx context.Context, failfast bool, info balancer.
 
 		acw, ok := pickResult.SubConn.(*acBalancerWrapper)
 		if !ok {
-			logger.Error("subconn returned from pick is not *acBalancerWrapper")
+			logger.Errorf("subconn returned from pick is type %T, not *acBalancerWrapper", pickResult.SubConn)
 			continue
 		}
 		if t := acw.getAddrConn().getReadyTransport(); t != nil {
diff --git a/vendor/google.golang.org/grpc/resolver/map.go b/vendor/google.golang.org/grpc/resolver/map.go
new file mode 100644
index 000000000..e87ecd0ee
--- /dev/null
+++ b/vendor/google.golang.org/grpc/resolver/map.go
@@ -0,0 +1,109 @@
+/*
+ *
+ * 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 resolver
+
+type addressMapEntry struct {
+	addr  Address
+	value interface{}
+}
+
+// AddressMap is a map of addresses to arbitrary values taking into account
+// Attributes.  BalancerAttributes are ignored, as are Metadata and Type.
+// Multiple accesses may not be performed concurrently.  Must be created via
+// NewAddressMap; do not construct directly.
+type AddressMap struct {
+	m map[string]addressMapEntryList
+}
+
+type addressMapEntryList []*addressMapEntry
+
+// NewAddressMap creates a new AddressMap.
+func NewAddressMap() *AddressMap {
+	return &AddressMap{m: make(map[string]addressMapEntryList)}
+}
+
+// find returns the index of addr in the addressMapEntry slice, or -1 if not
+// present.
+func (l addressMapEntryList) find(addr Address) int {
+	if len(l) == 0 {
+		return -1
+	}
+	for i, entry := range l {
+		if entry.addr.ServerName == addr.ServerName &&
+			entry.addr.Attributes.Equal(addr.Attributes) {
+			return i
+		}
+	}
+	return -1
+}
+
+// Get returns the value for the address in the map, if present.
+func (a *AddressMap) Get(addr Address) (value interface{}, ok bool) {
+	entryList := a.m[addr.Addr]
+	if entry := entryList.find(addr); entry != -1 {
+		return entryList[entry].value, true
+	}
+	return nil, false
+}
+
+// Set updates or adds the value to the address in the map.
+func (a *AddressMap) Set(addr Address, value interface{}) {
+	entryList := a.m[addr.Addr]
+	if entry := entryList.find(addr); entry != -1 {
+		a.m[addr.Addr][entry].value = value
+		return
+	}
+	a.m[addr.Addr] = append(a.m[addr.Addr], &addressMapEntry{addr: addr, value: value})
+}
+
+// Delete removes addr from the map.
+func (a *AddressMap) Delete(addr Address) {
+	entryList := a.m[addr.Addr]
+	entry := entryList.find(addr)
+	if entry == -1 {
+		return
+	}
+	if len(entryList) == 1 {
+		entryList = nil
+	} else {
+		copy(entryList[entry:], entryList[entry+1:])
+		entryList = entryList[:len(entryList)-1]
+	}
+	a.m[addr.Addr] = entryList
+}
+
+// Len returns the number of entries in the map.
+func (a *AddressMap) Len() int {
+	ret := 0
+	for _, entryList := range a.m {
+		ret += len(entryList)
+	}
+	return ret
+}
+
+// Keys returns a slice of all current map keys.
+func (a *AddressMap) Keys() []Address {
+	ret := make([]Address, 0, a.Len())
+	for _, entryList := range a.m {
+		for _, entry := range entryList {
+			ret = append(ret, entry.addr)
+		}
+	}
+	return ret
+}
diff --git a/vendor/google.golang.org/grpc/resolver/resolver.go b/vendor/google.golang.org/grpc/resolver/resolver.go
index 6a9d234a5..e28b68026 100644
--- a/vendor/google.golang.org/grpc/resolver/resolver.go
+++ b/vendor/google.golang.org/grpc/resolver/resolver.go
@@ -23,6 +23,7 @@ package resolver
 import (
 	"context"
 	"net"
+	"net/url"
 
 	"google.golang.org/grpc/attributes"
 	"google.golang.org/grpc/credentials"
@@ -116,9 +117,14 @@ type Address struct {
 	ServerName string
 
 	// Attributes contains arbitrary data about this address intended for
-	// consumption by the load balancing policy.
+	// consumption by the SubConn.
 	Attributes *attributes.Attributes
 
+	// BalancerAttributes contains arbitrary data about this address intended
+	// for consumption by the LB policy.  These attribes do not affect SubConn
+	// creation, connection establishment, handshaking, etc.
+	BalancerAttributes *attributes.Attributes
+
 	// Type is the type of this address.
 	//
 	// Deprecated: use Attributes instead.
@@ -131,6 +137,15 @@ type Address struct {
 	Metadata interface{}
 }
 
+// Equal returns whether a and o are identical.  Metadata is compared directly,
+// not with any recursive introspection.
+func (a *Address) Equal(o Address) bool {
+	return a.Addr == o.Addr && a.ServerName == o.ServerName &&
+		a.Attributes.Equal(o.Attributes) &&
+		a.BalancerAttributes.Equal(o.BalancerAttributes) &&
+		a.Type == o.Type && a.Metadata == o.Metadata
+}
+
 // BuildOptions includes additional information for the builder to create
 // the resolver.
 type BuildOptions struct {
@@ -204,25 +219,36 @@ type ClientConn interface {
 
 // Target represents a target for gRPC, as specified in:
 // https://github.com/grpc/grpc/blob/master/doc/naming.md.
-// It is parsed from the target string that gets passed into Dial or DialContext by the user. And
-// grpc passes it to the resolver and the balancer.
+// It is parsed from the target string that gets passed into Dial or DialContext
+// by the user. And gRPC passes it to the resolver and the balancer.
 //
-// If the target follows the naming spec, and the parsed scheme is registered with grpc, we will
-// parse the target string according to the spec. e.g. "dns://some_authority/foo.bar" will be parsed
-// into &Target{Scheme: "dns", Authority: "some_authority", Endpoint: "foo.bar"}
+// If the target follows the naming spec, and the parsed scheme is registered
+// with gRPC, we will parse the target string according to the spec. If the
+// target does not contain a scheme or if the parsed scheme is not registered
+// (i.e. no corresponding resolver available to resolve the endpoint), we will
+// apply the default scheme, and will attempt to reparse it.
 //
-// If the target does not contain a scheme, we will apply the default scheme, and set the Target to
-// be the full target string. e.g. "foo.bar" will be parsed into
-// &Target{Scheme: resolver.GetDefaultScheme(), Endpoint: "foo.bar"}.
+// Examples:
 //
-// If the parsed scheme is not registered (i.e. no corresponding resolver available to resolve the
-// endpoint), we set the Scheme to be the default scheme, and set the Endpoint to be the full target
-// string. e.g. target string "unknown_scheme://authority/endpoint" will be parsed into
-// &Target{Scheme: resolver.GetDefaultScheme(), Endpoint: "unknown_scheme://authority/endpoint"}.
+// - "dns://some_authority/foo.bar"
+//   Target{Scheme: "dns", Authority: "some_authority", Endpoint: "foo.bar"}
+// - "foo.bar"
+//   Target{Scheme: resolver.GetDefaultScheme(), Endpoint: "foo.bar"}
+// - "unknown_scheme://authority/endpoint"
+//   Target{Scheme: resolver.GetDefaultScheme(), Endpoint: "unknown_scheme://authority/endpoint"}
 type Target struct {
-	Scheme    string
+	// Deprecated: use URL.Scheme instead.
+	Scheme string
+	// Deprecated: use URL.Host instead.
 	Authority string
-	Endpoint  string
+	// Deprecated: use URL.Path or URL.Opaque instead. The latter is set when
+	// the former is empty.
+	Endpoint string
+	// URL contains the parsed dial target with an optional default scheme added
+	// to it if the original dial target contained no scheme or contained an
+	// unregistered scheme. Any query params specified in the original dial
+	// target can be accessed from here.
+	URL url.URL
 }
 
 // Builder creates a resolver that will be used to watch name resolution updates.
diff --git a/vendor/google.golang.org/grpc/server.go b/vendor/google.golang.org/grpc/server.go
index 557f29559..eadf9e05f 100644
--- a/vendor/google.golang.org/grpc/server.go
+++ b/vendor/google.golang.org/grpc/server.go
@@ -885,13 +885,11 @@ func (s *Server) newHTTP2Transport(c net.Conn) transport.ServerTransport {
 		// ErrConnDispatched means that the connection was dispatched away from
 		// gRPC; those connections should be left open.
 		if err != credentials.ErrConnDispatched {
-			c.Close()
-		}
-		// Don't log on ErrConnDispatched and io.EOF to prevent log spam.
-		if err != credentials.ErrConnDispatched {
+			// Don't log on ErrConnDispatched and io.EOF to prevent log spam.
 			if err != io.EOF {
 				channelz.Warning(logger, s.channelzID, "grpc: Server.Serve failed to create ServerTransport: ", err)
 			}
+			c.Close()
 		}
 		return nil
 	}
@@ -1106,16 +1104,21 @@ func chainUnaryServerInterceptors(s *Server) {
 
 func chainUnaryInterceptors(interceptors []UnaryServerInterceptor) UnaryServerInterceptor {
 	return func(ctx context.Context, req interface{}, info *UnaryServerInfo, handler UnaryHandler) (interface{}, error) {
-		var i int
-		var next UnaryHandler
-		next = func(ctx context.Context, req interface{}) (interface{}, error) {
-			if i == len(interceptors)-1 {
-				return interceptors[i](ctx, req, info, handler)
-			}
-			i++
-			return interceptors[i-1](ctx, req, info, next)
+		// the struct ensures the variables are allocated together, rather than separately, since we
+		// know they should be garbage collected together. This saves 1 allocation and decreases
+		// time/call by about 10% on the microbenchmark.
+		var state struct {
+			i    int
+			next UnaryHandler
 		}
-		return next(ctx, req)
+		state.next = func(ctx context.Context, req interface{}) (interface{}, error) {
+			if state.i == len(interceptors)-1 {
+				return interceptors[state.i](ctx, req, info, handler)
+			}
+			state.i++
+			return interceptors[state.i-1](ctx, req, info, state.next)
+		}
+		return state.next(ctx, req)
 	}
 }
 
@@ -1391,16 +1394,21 @@ func chainStreamServerInterceptors(s *Server) {
 
 func chainStreamInterceptors(interceptors []StreamServerInterceptor) StreamServerInterceptor {
 	return func(srv interface{}, ss ServerStream, info *StreamServerInfo, handler StreamHandler) error {
-		var i int
-		var next StreamHandler
-		next = func(srv interface{}, ss ServerStream) error {
-			if i == len(interceptors)-1 {
-				return interceptors[i](srv, ss, info, handler)
-			}
-			i++
-			return interceptors[i-1](srv, ss, info, next)
+		// the struct ensures the variables are allocated together, rather than separately, since we
+		// know they should be garbage collected together. This saves 1 allocation and decreases
+		// time/call by about 10% on the microbenchmark.
+		var state struct {
+			i    int
+			next StreamHandler
 		}
-		return next(srv, ss)
+		state.next = func(srv interface{}, ss ServerStream) error {
+			if state.i == len(interceptors)-1 {
+				return interceptors[state.i](srv, ss, info, handler)
+			}
+			state.i++
+			return interceptors[state.i-1](srv, ss, info, state.next)
+		}
+		return state.next(srv, ss)
 	}
 }
 
diff --git a/vendor/google.golang.org/grpc/status/status.go b/vendor/google.golang.org/grpc/status/status.go
index 54d187186..af2cffe98 100644
--- a/vendor/google.golang.org/grpc/status/status.go
+++ b/vendor/google.golang.org/grpc/status/status.go
@@ -73,11 +73,16 @@ func FromProto(s *spb.Status) *Status {
 	return status.FromProto(s)
 }
 
-// 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.
+// FromError returns a Status representation of err.
+//
+// - If err was produced by this package or implements the method `GRPCStatus()
+//   *Status`, the appropriate Status is returned.
+//
+// - If err is nil, a Status is returned with codes.OK and no message.
+//
+// - Otherwise, err is an error not compatible with this package.  In this
+//   case, a Status is returned with codes.Unknown and err's Error() message,
+//   and ok is false.
 func FromError(err error) (s *Status, ok bool) {
 	if err == nil {
 		return nil, true
diff --git a/vendor/google.golang.org/grpc/version.go b/vendor/google.golang.org/grpc/version.go
index 48594bc24..1a5fd584a 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 = "1.41.0"
+const Version = "1.42.0"
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 3eb63d228..dd3902dd4 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -484,7 +484,7 @@ google.golang.org/appengine/urlfetch
 google.golang.org/genproto/googleapis/api/httpbody
 google.golang.org/genproto/googleapis/rpc/status
 google.golang.org/genproto/protobuf/field_mask
-# google.golang.org/grpc v1.41.0
+# google.golang.org/grpc v1.42.0
 ## explicit
 google.golang.org/grpc
 google.golang.org/grpc/attributes