rebase: Bump google.golang.org/grpc from 1.57.0 to 1.58.0

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.57.0 to 1.58.0.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](https://github.com/grpc/grpc-go/compare/v1.57.0...v1.58.0)

---
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>

vendor/google.golang.org/grpc/internal/balancer/gracefulswitch/gracefulswitch.go

@@ -200,8 +200,8 @@ func (gsb *Balancer) ExitIdle() {
 	}
 }
 
-// UpdateSubConnState forwards the update to the appropriate child.
-func (gsb *Balancer) UpdateSubConnState(sc balancer.SubConn, state balancer.SubConnState) {
+// updateSubConnState forwards the update to the appropriate child.
+func (gsb *Balancer) updateSubConnState(sc balancer.SubConn, state balancer.SubConnState, cb func(balancer.SubConnState)) {
 	gsb.currentMu.Lock()
 	defer gsb.currentMu.Unlock()
 	gsb.mu.Lock()
@@ -214,13 +214,26 @@ func (gsb *Balancer) UpdateSubConnState(sc balancer.SubConn, state balancer.SubC
 	} else if gsb.balancerPending != nil && gsb.balancerPending.subconns[sc] {
 		balToUpdate = gsb.balancerPending
 	}
-	gsb.mu.Unlock()
 	if balToUpdate == nil {
 		// SubConn belonged to a stale lb policy that has not yet fully closed,
 		// or the balancer was already closed.
+		gsb.mu.Unlock()
 		return
 	}
-	balToUpdate.UpdateSubConnState(sc, state)
+	if state.ConnectivityState == connectivity.Shutdown {
+		delete(balToUpdate.subconns, sc)
+	}
+	gsb.mu.Unlock()
+	if cb != nil {
+		cb(state)
+	} else {
+		balToUpdate.UpdateSubConnState(sc, state)
+	}
+}
+
+// UpdateSubConnState forwards the update to the appropriate child.
+func (gsb *Balancer) UpdateSubConnState(sc balancer.SubConn, state balancer.SubConnState) {
+	gsb.updateSubConnState(sc, state, nil)
 }
 
 // Close closes any active child balancers.
@@ -242,7 +255,7 @@ func (gsb *Balancer) Close() {
 //
 // It implements the balancer.ClientConn interface and is passed down in that
 // capacity to the wrapped balancer. It maintains a set of subConns created by
-// the wrapped balancer and calls from the latter to create/update/remove
+// the wrapped balancer and calls from the latter to create/update/shutdown
 // SubConns update this set before being forwarded to the parent ClientConn.
 // State updates from the wrapped balancer can result in invocation of the
 // graceful switch logic.
@@ -254,21 +267,10 @@ type balancerWrapper struct {
 	subconns  map[balancer.SubConn]bool // subconns created by this balancer
 }
 
-func (bw *balancerWrapper) UpdateSubConnState(sc balancer.SubConn, state balancer.SubConnState) {
-	if state.ConnectivityState == connectivity.Shutdown {
-		bw.gsb.mu.Lock()
-		delete(bw.subconns, sc)
-		bw.gsb.mu.Unlock()
-	}
-	// There is no need to protect this read with a mutex, as the write to the
-	// Balancer field happens in SwitchTo, which completes before this can be
-	// called.
-	bw.Balancer.UpdateSubConnState(sc, state)
-}
-
-// Close closes the underlying LB policy and removes the subconns it created. bw
-// must not be referenced via balancerCurrent or balancerPending in gsb when
-// called. gsb.mu must not be held.  Does not panic with a nil receiver.
+// Close closes the underlying LB policy and shuts down the subconns it
+// created. bw must not be referenced via balancerCurrent or balancerPending in
+// gsb when called. gsb.mu must not be held.  Does not panic with a nil
+// receiver.
 func (bw *balancerWrapper) Close() {
 	// before Close is called.
 	if bw == nil {
@@ -281,7 +283,7 @@ func (bw *balancerWrapper) Close() {
 	bw.Balancer.Close()
 	bw.gsb.mu.Lock()
 	for sc := range bw.subconns {
-		bw.gsb.cc.RemoveSubConn(sc)
+		sc.Shutdown()
 	}
 	bw.gsb.mu.Unlock()
 }
@@ -335,13 +337,16 @@ func (bw *balancerWrapper) NewSubConn(addrs []resolver.Address, opts balancer.Ne
 	}
 	bw.gsb.mu.Unlock()
 
+	var sc balancer.SubConn
+	oldListener := opts.StateListener
+	opts.StateListener = func(state balancer.SubConnState) { bw.gsb.updateSubConnState(sc, state, oldListener) }
 	sc, err := bw.gsb.cc.NewSubConn(addrs, opts)
 	if err != nil {
 		return nil, err
 	}
 	bw.gsb.mu.Lock()
 	if !bw.gsb.balancerCurrentOrPending(bw) { // balancer was closed during this call
-		bw.gsb.cc.RemoveSubConn(sc)
+		sc.Shutdown()
 		bw.gsb.mu.Unlock()
 		return nil, fmt.Errorf("%T at address %p that called NewSubConn is deleted", bw, bw)
 	}
@@ -360,13 +365,9 @@ func (bw *balancerWrapper) ResolveNow(opts resolver.ResolveNowOptions) {
 }
 
 func (bw *balancerWrapper) RemoveSubConn(sc balancer.SubConn) {
-	bw.gsb.mu.Lock()
-	if !bw.gsb.balancerCurrentOrPending(bw) {
-		bw.gsb.mu.Unlock()
-		return
-	}
-	bw.gsb.mu.Unlock()
-	bw.gsb.cc.RemoveSubConn(sc)
+	// Note: existing third party balancers may call this, so it must remain
+	// until RemoveSubConn is fully removed.
+	sc.Shutdown()
 }
 
 func (bw *balancerWrapper) UpdateAddresses(sc balancer.SubConn, addrs []resolver.Address) {

vendor/google.golang.org/grpc/internal/balancerload/load.go

@@ -25,7 +25,7 @@ import (
 // Parser converts loads from metadata into a concrete type.
 type Parser interface {
 	// Parse parses loads from metadata.
-	Parse(md metadata.MD) interface{}
+	Parse(md metadata.MD) any
 }
 
 var parser Parser
@@ -38,7 +38,7 @@ func SetParser(lr Parser) {
 }
 
 // Parse calls parser.Read().
-func Parse(md metadata.MD) interface{} {
+func Parse(md metadata.MD) any {
 	if parser == nil {
 		return nil
 	}

vendor/google.golang.org/grpc/internal/binarylog/method_logger.go

@@ -230,7 +230,7 @@ type ClientMessage struct {
 	OnClientSide bool
 	// Message can be a proto.Message or []byte. Other messages formats are not
 	// supported.
-	Message interface{}
+	Message any
 }
 
 func (c *ClientMessage) toProto() *binlogpb.GrpcLogEntry {
@@ -270,7 +270,7 @@ type ServerMessage struct {
 	OnClientSide bool
 	// Message can be a proto.Message or []byte. Other messages formats are not
 	// supported.
-	Message interface{}
+	Message any
 }
 
 func (c *ServerMessage) toProto() *binlogpb.GrpcLogEntry {

vendor/google.golang.org/grpc/internal/buffer/unbounded.go

@@ -28,25 +28,25 @@ import "sync"
 // the underlying mutex used for synchronization.
 //
 // Unbounded supports values of any type to be stored in it by using a channel
-// of `interface{}`. This means that a call to Put() incurs an extra memory
-// allocation, and also that users need a type assertion while reading. For
-// performance critical code paths, using Unbounded is strongly discouraged and
-// defining a new type specific implementation of this buffer is preferred. See
+// of `any`. This means that a call to Put() incurs an extra memory allocation,
+// and also that users need a type assertion while reading. For performance
+// critical code paths, using Unbounded is strongly discouraged and defining a
+// new type specific implementation of this buffer is preferred. See
 // internal/transport/transport.go for an example of this.
 type Unbounded struct {
-	c       chan interface{}
+	c       chan any
 	closed  bool
 	mu      sync.Mutex
-	backlog []interface{}
+	backlog []any
 }
 
 // NewUnbounded returns a new instance of Unbounded.
 func NewUnbounded() *Unbounded {
-	return &Unbounded{c: make(chan interface{}, 1)}
+	return &Unbounded{c: make(chan any, 1)}
 }
 
 // Put adds t to the unbounded buffer.
-func (b *Unbounded) Put(t interface{}) {
+func (b *Unbounded) Put(t any) {
 	b.mu.Lock()
 	defer b.mu.Unlock()
 	if b.closed {
@@ -89,7 +89,7 @@ func (b *Unbounded) Load() {
 //
 // If the unbounded buffer is closed, the read channel returned by this method
 // is closed.
-func (b *Unbounded) Get() <-chan interface{} {
+func (b *Unbounded) Get() <-chan any {
 	return b.c
 }
 

vendor/google.golang.org/grpc/internal/channelz/funcs.go

@@ -24,9 +24,7 @@
 package channelz
 
 import (
-	"context"
 	"errors"
-	"fmt"
 	"sort"
 	"sync"
 	"sync/atomic"
@@ -40,8 +38,11 @@ const (
 )
 
 var (
-	db    dbWrapper
-	idGen idGenerator
+	// IDGen is the global channelz entity ID generator.  It should not be used
+	// outside this package except by tests.
+	IDGen IDGenerator
+
+	db dbWrapper
 	// EntryPerPage defines the number of channelz entries to be shown on a web page.
 	EntryPerPage  = int64(50)
 	curState      int32
@@ -52,14 +53,14 @@ var (
 func TurnOn() {
 	if !IsOn() {
 		db.set(newChannelMap())
-		idGen.reset()
+		IDGen.Reset()
 		atomic.StoreInt32(&curState, 1)
 	}
 }
 
 // IsOn returns whether channelz data collection is on.
 func IsOn() bool {
-	return atomic.CompareAndSwapInt32(&curState, 1, 1)
+	return atomic.LoadInt32(&curState) == 1
 }
 
 // SetMaxTraceEntry sets maximum number of trace entry per entity (i.e. channel/subchannel).
@@ -97,43 +98,6 @@ func (d *dbWrapper) get() *channelMap {
 	return d.DB
 }
 
-// NewChannelzStorageForTesting initializes channelz data storage and id
-// generator for testing purposes.
-//
-// Returns a cleanup function to be invoked by the test, which waits for up to
-// 10s for all channelz state to be reset by the grpc goroutines when those
-// entities get closed. This cleanup function helps with ensuring that tests
-// don't mess up each other.
-func NewChannelzStorageForTesting() (cleanup func() error) {
-	db.set(newChannelMap())
-	idGen.reset()
-
-	return func() error {
-		cm := db.get()
-		if cm == nil {
-			return nil
-		}
-
-		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
-		defer cancel()
-		ticker := time.NewTicker(10 * time.Millisecond)
-		defer ticker.Stop()
-		for {
-			cm.mu.RLock()
-			topLevelChannels, servers, channels, subChannels, listenSockets, normalSockets := len(cm.topLevelChannels), len(cm.servers), len(cm.channels), len(cm.subChannels), len(cm.listenSockets), len(cm.normalSockets)
-			cm.mu.RUnlock()
-
-			if err := ctx.Err(); err != nil {
-				return fmt.Errorf("after 10s the channelz map has not been cleaned up yet, topchannels: %d, servers: %d, channels: %d, subchannels: %d, listen sockets: %d, normal sockets: %d", topLevelChannels, servers, channels, subChannels, listenSockets, normalSockets)
-			}
-			if topLevelChannels == 0 && servers == 0 && channels == 0 && subChannels == 0 && listenSockets == 0 && normalSockets == 0 {
-				return nil
-			}
-			<-ticker.C
-		}
-	}
-}
-
 // GetTopChannels returns a slice of top channel's ChannelMetric, along with a
 // boolean indicating whether there's more top channels to be queried for.
 //
@@ -193,7 +157,7 @@ func GetServer(id int64) *ServerMetric {
 //
 // If channelz is not turned ON, the channelz database is not mutated.
 func RegisterChannel(c Channel, pid *Identifier, ref string) *Identifier {
-	id := idGen.genID()
+	id := IDGen.genID()
 	var parent int64
 	isTopChannel := true
 	if pid != nil {
@@ -229,7 +193,7 @@ func RegisterSubChannel(c Channel, pid *Identifier, ref string) (*Identifier, er
 	if pid == nil {
 		return nil, errors.New("a SubChannel's parent id cannot be nil")
 	}
-	id := idGen.genID()
+	id := IDGen.genID()
 	if !IsOn() {
 		return newIdentifer(RefSubChannel, id, pid), nil
 	}
@@ -251,7 +215,7 @@ func RegisterSubChannel(c Channel, pid *Identifier, ref string) (*Identifier, er
 //
 // If channelz is not turned ON, the channelz database is not mutated.
 func RegisterServer(s Server, ref string) *Identifier {
-	id := idGen.genID()
+	id := IDGen.genID()
 	if !IsOn() {
 		return newIdentifer(RefServer, id, nil)
 	}
@@ -277,7 +241,7 @@ func RegisterListenSocket(s Socket, pid *Identifier, ref string) (*Identifier, e
 	if pid == nil {
 		return nil, errors.New("a ListenSocket's parent id cannot be 0")
 	}
-	id := idGen.genID()
+	id := IDGen.genID()
 	if !IsOn() {
 		return newIdentifer(RefListenSocket, id, pid), nil
 	}
@@ -297,7 +261,7 @@ func RegisterNormalSocket(s Socket, pid *Identifier, ref string) (*Identifier, e
 	if pid == nil {
 		return nil, errors.New("a NormalSocket's parent id cannot be 0")
 	}
-	id := idGen.genID()
+	id := IDGen.genID()
 	if !IsOn() {
 		return newIdentifer(RefNormalSocket, id, pid), nil
 	}
@@ -776,14 +740,17 @@ func (c *channelMap) GetServer(id int64) *ServerMetric {
 	return sm
 }
 
-type idGenerator struct {
+// IDGenerator is an incrementing atomic that tracks IDs for channelz entities.
+type IDGenerator struct {
 	id int64
 }
 
-func (i *idGenerator) reset() {
+// Reset resets the generated ID back to zero.  Should only be used at
+// initialization or by tests sensitive to the ID number.
+func (i *IDGenerator) Reset() {
 	atomic.StoreInt64(&i.id, 0)
 }
 
-func (i *idGenerator) genID() int64 {
+func (i *IDGenerator) genID() int64 {
 	return atomic.AddInt64(&i.id, 1)
 }

vendor/google.golang.org/grpc/internal/channelz/logging.go

@@ -31,7 +31,7 @@ func withParens(id *Identifier) string {
 }
 
 // Info logs and adds a trace event if channelz is on.
-func Info(l grpclog.DepthLoggerV2, id *Identifier, args ...interface{}) {
+func Info(l grpclog.DepthLoggerV2, id *Identifier, args ...any) {
 	AddTraceEvent(l, id, 1, &TraceEventDesc{
 		Desc:     fmt.Sprint(args...),
 		Severity: CtInfo,
@@ -39,7 +39,7 @@ func Info(l grpclog.DepthLoggerV2, id *Identifier, args ...interface{}) {
 }
 
 // Infof logs and adds a trace event if channelz is on.
-func Infof(l grpclog.DepthLoggerV2, id *Identifier, format string, args ...interface{}) {
+func Infof(l grpclog.DepthLoggerV2, id *Identifier, format string, args ...any) {
 	AddTraceEvent(l, id, 1, &TraceEventDesc{
 		Desc:     fmt.Sprintf(format, args...),
 		Severity: CtInfo,
@@ -47,7 +47,7 @@ func Infof(l grpclog.DepthLoggerV2, id *Identifier, format string, args ...inter
 }
 
 // Warning logs and adds a trace event if channelz is on.
-func Warning(l grpclog.DepthLoggerV2, id *Identifier, args ...interface{}) {
+func Warning(l grpclog.DepthLoggerV2, id *Identifier, args ...any) {
 	AddTraceEvent(l, id, 1, &TraceEventDesc{
 		Desc:     fmt.Sprint(args...),
 		Severity: CtWarning,
@@ -55,7 +55,7 @@ func Warning(l grpclog.DepthLoggerV2, id *Identifier, args ...interface{}) {
 }
 
 // Warningf logs and adds a trace event if channelz is on.
-func Warningf(l grpclog.DepthLoggerV2, id *Identifier, format string, args ...interface{}) {
+func Warningf(l grpclog.DepthLoggerV2, id *Identifier, format string, args ...any) {
 	AddTraceEvent(l, id, 1, &TraceEventDesc{
 		Desc:     fmt.Sprintf(format, args...),
 		Severity: CtWarning,
@@ -63,7 +63,7 @@ func Warningf(l grpclog.DepthLoggerV2, id *Identifier, format string, args ...in
 }
 
 // Error logs and adds a trace event if channelz is on.
-func Error(l grpclog.DepthLoggerV2, id *Identifier, args ...interface{}) {
+func Error(l grpclog.DepthLoggerV2, id *Identifier, args ...any) {
 	AddTraceEvent(l, id, 1, &TraceEventDesc{
 		Desc:     fmt.Sprint(args...),
 		Severity: CtError,
@@ -71,7 +71,7 @@ func Error(l grpclog.DepthLoggerV2, id *Identifier, args ...interface{}) {
 }
 
 // Errorf logs and adds a trace event if channelz is on.
-func Errorf(l grpclog.DepthLoggerV2, id *Identifier, format string, args ...interface{}) {
+func Errorf(l grpclog.DepthLoggerV2, id *Identifier, format string, args ...any) {
 	AddTraceEvent(l, id, 1, &TraceEventDesc{
 		Desc:     fmt.Sprintf(format, args...),
 		Severity: CtError,

vendor/google.golang.org/grpc/internal/channelz/types.go

@@ -628,6 +628,7 @@ type tracedChannel interface {
 
 type channelTrace struct {
 	cm          *channelMap
+	clearCalled bool
 	createdTime time.Time
 	eventCount  int64
 	mu          sync.Mutex
@@ -656,6 +657,10 @@ func (c *channelTrace) append(e *TraceEvent) {
 }
 
 func (c *channelTrace) clear() {
+	if c.clearCalled {
+		return
+	}
+	c.clearCalled = true
 	c.mu.Lock()
 	for _, e := range c.events {
 		if e.RefID != 0 {

vendor/google.golang.org/grpc/internal/channelz/util_linux.go

@@ -23,7 +23,7 @@ import (
 )
 
 // GetSocketOption gets the socket option info of the conn.
-func GetSocketOption(socket interface{}) *SocketOptionData {
+func GetSocketOption(socket any) *SocketOptionData {
 	c, ok := socket.(syscall.Conn)
 	if !ok {
 		return nil

vendor/google.golang.org/grpc/internal/channelz/util_nonlinux.go

@@ -22,6 +22,6 @@
 package channelz
 
 // GetSocketOption gets the socket option info of the conn.
-func GetSocketOption(c interface{}) *SocketOptionData {
+func GetSocketOption(c any) *SocketOptionData {
 	return nil
 }

vendor/google.golang.org/grpc/internal/credentials/credentials.go

@@ -25,12 +25,12 @@ import (
 type requestInfoKey struct{}
 
 // NewRequestInfoContext creates a context with ri.
-func NewRequestInfoContext(ctx context.Context, ri interface{}) context.Context {
+func NewRequestInfoContext(ctx context.Context, ri any) context.Context {
 	return context.WithValue(ctx, requestInfoKey{}, ri)
 }
 
 // RequestInfoFromContext extracts the RequestInfo from ctx.
-func RequestInfoFromContext(ctx context.Context) interface{} {
+func RequestInfoFromContext(ctx context.Context) any {
 	return ctx.Value(requestInfoKey{})
 }
 
@@ -39,11 +39,11 @@ func RequestInfoFromContext(ctx context.Context) interface{} {
 type clientHandshakeInfoKey struct{}
 
 // ClientHandshakeInfoFromContext extracts the ClientHandshakeInfo from ctx.
-func ClientHandshakeInfoFromContext(ctx context.Context) interface{} {
+func ClientHandshakeInfoFromContext(ctx context.Context) any {
 	return ctx.Value(clientHandshakeInfoKey{})
 }
 
 // NewClientHandshakeInfoContext creates a context with chi.
-func NewClientHandshakeInfoContext(ctx context.Context, chi interface{}) context.Context {
+func NewClientHandshakeInfoContext(ctx context.Context, chi any) context.Context {
 	return context.WithValue(ctx, clientHandshakeInfoKey{}, chi)
 }

vendor/google.golang.org/grpc/internal/envconfig/envconfig.go

@@ -37,9 +37,12 @@ var (
 	// checking which NACKs configs specifying ring sizes > 8*1024*1024 (~8M).
 	RingHashCap = uint64FromEnv("GRPC_RING_HASH_CAP", 4096, 1, 8*1024*1024)
 	// PickFirstLBConfig is set if we should support configuration of the
-	// pick_first LB policy, which can be enabled by setting the environment
-	// variable "GRPC_EXPERIMENTAL_PICKFIRST_LB_CONFIG" to "true".
-	PickFirstLBConfig = boolFromEnv("GRPC_EXPERIMENTAL_PICKFIRST_LB_CONFIG", false)
+	// pick_first LB policy.
+	PickFirstLBConfig = boolFromEnv("GRPC_EXPERIMENTAL_PICKFIRST_LB_CONFIG", true)
+	// LeastRequestLB is set if we should support the least_request_experimental
+	// LB policy, which can be enabled by setting the environment variable
+	// "GRPC_EXPERIMENTAL_ENABLE_LEAST_REQUEST" to "true".
+	LeastRequestLB = boolFromEnv("GRPC_EXPERIMENTAL_ENABLE_LEAST_REQUEST", false)
 	// ALTSMaxConcurrentHandshakes is the maximum number of concurrent ALTS
 	// handshakes that can be performed.
 	ALTSMaxConcurrentHandshakes = uint64FromEnv("GRPC_ALTS_MAX_CONCURRENT_HANDSHAKES", 100, 1, 100)

vendor/google.golang.org/grpc/internal/grpclog/grpclog.go

@@ -30,7 +30,7 @@ var Logger LoggerV2
 var DepthLogger DepthLoggerV2
 
 // InfoDepth logs to the INFO log at the specified depth.
-func InfoDepth(depth int, args ...interface{}) {
+func InfoDepth(depth int, args ...any) {
 	if DepthLogger != nil {
 		DepthLogger.InfoDepth(depth, args...)
 	} else {
@@ -39,7 +39,7 @@ func InfoDepth(depth int, args ...interface{}) {
 }
 
 // WarningDepth logs to the WARNING log at the specified depth.
-func WarningDepth(depth int, args ...interface{}) {
+func WarningDepth(depth int, args ...any) {
 	if DepthLogger != nil {
 		DepthLogger.WarningDepth(depth, args...)
 	} else {
@@ -48,7 +48,7 @@ func WarningDepth(depth int, args ...interface{}) {
 }
 
 // ErrorDepth logs to the ERROR log at the specified depth.
-func ErrorDepth(depth int, args ...interface{}) {
+func ErrorDepth(depth int, args ...any) {
 	if DepthLogger != nil {
 		DepthLogger.ErrorDepth(depth, args...)
 	} else {
@@ -57,7 +57,7 @@ func ErrorDepth(depth int, args ...interface{}) {
 }
 
 // FatalDepth logs to the FATAL log at the specified depth.
-func FatalDepth(depth int, args ...interface{}) {
+func FatalDepth(depth int, args ...any) {
 	if DepthLogger != nil {
 		DepthLogger.FatalDepth(depth, args...)
 	} else {
@@ -71,35 +71,35 @@ func FatalDepth(depth int, args ...interface{}) {
 // is defined here to avoid a circular dependency.
 type LoggerV2 interface {
 	// Info logs to INFO log. Arguments are handled in the manner of fmt.Print.
-	Info(args ...interface{})
+	Info(args ...any)
 	// Infoln logs to INFO log. Arguments are handled in the manner of fmt.Println.
-	Infoln(args ...interface{})
+	Infoln(args ...any)
 	// Infof logs to INFO log. Arguments are handled in the manner of fmt.Printf.
-	Infof(format string, args ...interface{})
+	Infof(format string, args ...any)
 	// Warning logs to WARNING log. Arguments are handled in the manner of fmt.Print.
-	Warning(args ...interface{})
+	Warning(args ...any)
 	// Warningln logs to WARNING log. Arguments are handled in the manner of fmt.Println.
-	Warningln(args ...interface{})
+	Warningln(args ...any)
 	// Warningf logs to WARNING log. Arguments are handled in the manner of fmt.Printf.
-	Warningf(format string, args ...interface{})
+	Warningf(format string, args ...any)
 	// Error logs to ERROR log. Arguments are handled in the manner of fmt.Print.
-	Error(args ...interface{})
+	Error(args ...any)
 	// Errorln logs to ERROR log. Arguments are handled in the manner of fmt.Println.
-	Errorln(args ...interface{})
+	Errorln(args ...any)
 	// Errorf logs to ERROR log. Arguments are handled in the manner of fmt.Printf.
-	Errorf(format string, args ...interface{})
+	Errorf(format string, args ...any)
 	// Fatal logs to ERROR log. Arguments are handled in the manner of fmt.Print.
 	// gRPC ensures that all Fatal logs will exit with os.Exit(1).
 	// Implementations may also call os.Exit() with a non-zero exit code.
-	Fatal(args ...interface{})
+	Fatal(args ...any)
 	// Fatalln logs to ERROR log. Arguments are handled in the manner of fmt.Println.
 	// gRPC ensures that all Fatal logs will exit with os.Exit(1).
 	// Implementations may also call os.Exit() with a non-zero exit code.
-	Fatalln(args ...interface{})
+	Fatalln(args ...any)
 	// Fatalf logs to ERROR log. Arguments are handled in the manner of fmt.Printf.
 	// gRPC ensures that all Fatal logs will exit with os.Exit(1).
 	// Implementations may also call os.Exit() with a non-zero exit code.
-	Fatalf(format string, args ...interface{})
+	Fatalf(format string, args ...any)
 	// V reports whether verbosity level l is at least the requested verbose level.
 	V(l int) bool
 }
@@ -116,11 +116,11 @@ type LoggerV2 interface {
 // later release.
 type DepthLoggerV2 interface {
 	// InfoDepth logs to INFO log at the specified depth. Arguments are handled in the manner of fmt.Println.
-	InfoDepth(depth int, args ...interface{})
+	InfoDepth(depth int, args ...any)
 	// WarningDepth logs to WARNING log at the specified depth. Arguments are handled in the manner of fmt.Println.
-	WarningDepth(depth int, args ...interface{})
+	WarningDepth(depth int, args ...any)
 	// ErrorDepth logs to ERROR log at the specified depth. Arguments are handled in the manner of fmt.Println.
-	ErrorDepth(depth int, args ...interface{})
+	ErrorDepth(depth int, args ...any)
 	// FatalDepth logs to FATAL log at the specified depth. Arguments are handled in the manner of fmt.Println.
-	FatalDepth(depth int, args ...interface{})
+	FatalDepth(depth int, args ...any)
 }

vendor/google.golang.org/grpc/internal/grpclog/prefixLogger.go

@@ -31,7 +31,7 @@ type PrefixLogger struct {
 }
 
 // Infof does info logging.
-func (pl *PrefixLogger) Infof(format string, args ...interface{}) {
+func (pl *PrefixLogger) Infof(format string, args ...any) {
 	if pl != nil {
 		// Handle nil, so the tests can pass in a nil logger.
 		format = pl.prefix + format
@@ -42,7 +42,7 @@ func (pl *PrefixLogger) Infof(format string, args ...interface{}) {
 }
 
 // Warningf does warning logging.
-func (pl *PrefixLogger) Warningf(format string, args ...interface{}) {
+func (pl *PrefixLogger) Warningf(format string, args ...any) {
 	if pl != nil {
 		format = pl.prefix + format
 		pl.logger.WarningDepth(1, fmt.Sprintf(format, args...))
@@ -52,7 +52,7 @@ func (pl *PrefixLogger) Warningf(format string, args ...interface{}) {
 }
 
 // Errorf does error logging.
-func (pl *PrefixLogger) Errorf(format string, args ...interface{}) {
+func (pl *PrefixLogger) Errorf(format string, args ...any) {
 	if pl != nil {
 		format = pl.prefix + format
 		pl.logger.ErrorDepth(1, fmt.Sprintf(format, args...))
@@ -62,7 +62,7 @@ func (pl *PrefixLogger) Errorf(format string, args ...interface{}) {
 }
 
 // Debugf does info logging at verbose level 2.
-func (pl *PrefixLogger) Debugf(format string, args ...interface{}) {
+func (pl *PrefixLogger) Debugf(format string, args ...any) {
 	// TODO(6044): Refactor interfaces LoggerV2 and DepthLogger, and maybe
 	// rewrite PrefixLogger a little to ensure that we don't use the global
 	// `Logger` here, and instead use the `logger` field.

vendor/google.golang.org/grpc/internal/grpcsync/callback_serializer.go

@@ -32,10 +32,10 @@ import (
 //
 // This type is safe for concurrent access.
 type CallbackSerializer struct {
-	// Done is closed once the serializer is shut down completely, i.e all
+	// done is closed once the serializer is shut down completely, i.e all
 	// scheduled callbacks are executed and the serializer has deallocated all
 	// its resources.
-	Done chan struct{}
+	done chan struct{}
 
 	callbacks *buffer.Unbounded
 	closedMu  sync.Mutex
@@ -48,12 +48,12 @@ type CallbackSerializer struct {
 // callbacks will be added once this context is canceled, and any pending un-run
 // callbacks will be executed before the serializer is shut down.
 func NewCallbackSerializer(ctx context.Context) *CallbackSerializer {
-	t := &CallbackSerializer{
-		Done:      make(chan struct{}),
+	cs := &CallbackSerializer{
+		done:      make(chan struct{}),
 		callbacks: buffer.NewUnbounded(),
 	}
-	go t.run(ctx)
-	return t
+	go cs.run(ctx)
+	return cs
 }
 
 // Schedule adds a callback to be scheduled after existing callbacks are run.
@@ -64,56 +64,62 @@ func NewCallbackSerializer(ctx context.Context) *CallbackSerializer {
 // Return value indicates if the callback was successfully added to the list of
 // callbacks to be executed by the serializer. It is not possible to add
 // callbacks once the context passed to NewCallbackSerializer is cancelled.
-func (t *CallbackSerializer) Schedule(f func(ctx context.Context)) bool {
-	t.closedMu.Lock()
-	defer t.closedMu.Unlock()
+func (cs *CallbackSerializer) Schedule(f func(ctx context.Context)) bool {
+	cs.closedMu.Lock()
+	defer cs.closedMu.Unlock()
 
-	if t.closed {
+	if cs.closed {
 		return false
 	}
-	t.callbacks.Put(f)
+	cs.callbacks.Put(f)
 	return true
 }
 
-func (t *CallbackSerializer) run(ctx context.Context) {
+func (cs *CallbackSerializer) run(ctx context.Context) {
 	var backlog []func(context.Context)
 
-	defer close(t.Done)
+	defer close(cs.done)
 	for ctx.Err() == nil {
 		select {
 		case <-ctx.Done():
 			// Do nothing here. Next iteration of the for loop will not happen,
 			// since ctx.Err() would be non-nil.
-		case callback, ok := <-t.callbacks.Get():
+		case callback, ok := <-cs.callbacks.Get():
 			if !ok {
 				return
 			}
-			t.callbacks.Load()
+			cs.callbacks.Load()
 			callback.(func(ctx context.Context))(ctx)
 		}
 	}
 
 	// Fetch pending callbacks if any, and execute them before returning from
-	// this method and closing t.Done.
-	t.closedMu.Lock()
-	t.closed = true
-	backlog = t.fetchPendingCallbacks()
-	t.callbacks.Close()
-	t.closedMu.Unlock()
+	// this method and closing cs.done.
+	cs.closedMu.Lock()
+	cs.closed = true
+	backlog = cs.fetchPendingCallbacks()
+	cs.callbacks.Close()
+	cs.closedMu.Unlock()
 	for _, b := range backlog {
 		b(ctx)
 	}
 }
 
-func (t *CallbackSerializer) fetchPendingCallbacks() []func(context.Context) {
+func (cs *CallbackSerializer) fetchPendingCallbacks() []func(context.Context) {
 	var backlog []func(context.Context)
 	for {
 		select {
-		case b := <-t.callbacks.Get():
+		case b := <-cs.callbacks.Get():
 			backlog = append(backlog, b.(func(context.Context)))
-			t.callbacks.Load()
+			cs.callbacks.Load()
 		default:
 			return backlog
 		}
 	}
 }
+
+// Done returns a channel that is closed after the context passed to
+// NewCallbackSerializer is canceled and all callbacks have been executed.
+func (cs *CallbackSerializer) Done() <-chan struct{} {
+	return cs.done
+}

vendor/google.golang.org/grpc/internal/grpcsync/pubsub.go

@@ -29,7 +29,7 @@ import (
 type Subscriber interface {
 	// OnMessage is invoked when a new message is published. Implementations
 	// must not block in this method.
-	OnMessage(msg interface{})
+	OnMessage(msg any)
 }
 
 // PubSub is a simple one-to-many publish-subscribe system that supports
@@ -40,25 +40,23 @@ type Subscriber interface {
 // subscribers interested in receiving these messages register a callback
 // via the Subscribe() method.
 //
-// Once a PubSub is stopped, no more messages can be published, and
-// it is guaranteed that no more subscriber callback will be invoked.
+// Once a PubSub is stopped, no more messages can be published, but any pending
+// published messages will be delivered to the subscribers.  Done may be used
+// to determine when all published messages have been delivered.
 type PubSub struct {
-	cs     *CallbackSerializer
-	cancel context.CancelFunc
+	cs *CallbackSerializer
 
 	// Access to the below fields are guarded by this mutex.
 	mu          sync.Mutex
-	msg         interface{}
+	msg         any
 	subscribers map[Subscriber]bool
-	stopped     bool
 }
 
-// NewPubSub returns a new PubSub instance.
-func NewPubSub() *PubSub {
-	ctx, cancel := context.WithCancel(context.Background())
+// NewPubSub returns a new PubSub instance.  Users should cancel the
+// provided context to shutdown the PubSub.
+func NewPubSub(ctx context.Context) *PubSub {
 	return &PubSub{
 		cs:          NewCallbackSerializer(ctx),
-		cancel:      cancel,
 		subscribers: map[Subscriber]bool{},
 	}
 }
@@ -75,10 +73,6 @@ func (ps *PubSub) Subscribe(sub Subscriber) (cancel func()) {
 	ps.mu.Lock()
 	defer ps.mu.Unlock()
 
-	if ps.stopped {
-		return func() {}
-	}
-
 	ps.subscribers[sub] = true
 
 	if ps.msg != nil {
@@ -102,14 +96,10 @@ func (ps *PubSub) Subscribe(sub Subscriber) (cancel func()) {
 
 // Publish publishes the provided message to the PubSub, and invokes
 // callbacks registered by subscribers asynchronously.
-func (ps *PubSub) Publish(msg interface{}) {
+func (ps *PubSub) Publish(msg any) {
 	ps.mu.Lock()
 	defer ps.mu.Unlock()
 
-	if ps.stopped {
-		return
-	}
-
 	ps.msg = msg
 	for sub := range ps.subscribers {
 		s := sub
@@ -124,13 +114,8 @@ func (ps *PubSub) Publish(msg interface{}) {
 	}
 }
 
-// Stop shuts down the PubSub and releases any resources allocated by it.
-// It is guaranteed that no subscriber callbacks would be invoked once this
-// method returns.
-func (ps *PubSub) Stop() {
-	ps.mu.Lock()
-	defer ps.mu.Unlock()
-	ps.stopped = true
-
-	ps.cancel()
+// Done returns a channel that is closed after the context passed to NewPubSub
+// is canceled and all updates have been sent to subscribers.
+func (ps *PubSub) Done() <-chan struct{} {
+	return ps.cs.Done()
 }

vendor/google.golang.org/grpc/internal/idle/idle.go

@@ -0,0 +1,301 @@
+/*
+ *
+ * Copyright 2023 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 idle contains a component for managing idleness (entering and exiting)
+// based on RPC activity.
+package idle
+
+import (
+	"fmt"
+	"math"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"google.golang.org/grpc/grpclog"
+)
+
+// For overriding in unit tests.
+var timeAfterFunc = func(d time.Duration, f func()) *time.Timer {
+	return time.AfterFunc(d, f)
+}
+
+// Enforcer is the functionality provided by grpc.ClientConn to enter
+// and exit from idle mode.
+type Enforcer interface {
+	ExitIdleMode() error
+	EnterIdleMode() error
+}
+
+// Manager defines the functionality required to track RPC activity on a
+// channel.
+type Manager interface {
+	OnCallBegin() error
+	OnCallEnd()
+	Close()
+}
+
+type noopManager struct{}
+
+func (noopManager) OnCallBegin() error { return nil }
+func (noopManager) OnCallEnd()         {}
+func (noopManager) Close()             {}
+
+// manager implements the Manager interface. It uses atomic operations to
+// synchronize access to shared state and a mutex to guarantee mutual exclusion
+// in a critical section.
+type manager struct {
+	// State accessed atomically.
+	lastCallEndTime           int64 // Unix timestamp in nanos; time when the most recent RPC completed.
+	activeCallsCount          int32 // Count of active RPCs; -math.MaxInt32 means channel is idle or is trying to get there.
+	activeSinceLastTimerCheck int32 // Boolean; True if there was an RPC since the last timer callback.
+	closed                    int32 // Boolean; True when the manager is closed.
+
+	// Can be accessed without atomics or mutex since these are set at creation
+	// time and read-only after that.
+	enforcer Enforcer // Functionality provided by grpc.ClientConn.
+	timeout  int64    // Idle timeout duration nanos stored as an int64.
+	logger   grpclog.LoggerV2
+
+	// idleMu is used to guarantee mutual exclusion in two scenarios:
+	// - Opposing intentions:
+	//   - a: Idle timeout has fired and handleIdleTimeout() is trying to put
+	//     the channel in idle mode because the channel has been inactive.
+	//   - b: At the same time an RPC is made on the channel, and OnCallBegin()
+	//     is trying to prevent the channel from going idle.
+	// - Competing intentions:
+	//   - The channel is in idle mode and there are multiple RPCs starting at
+	//     the same time, all trying to move the channel out of idle. Only one
+	//     of them should succeed in doing so, while the other RPCs should
+	//     piggyback on the first one and be successfully handled.
+	idleMu       sync.RWMutex
+	actuallyIdle bool
+	timer        *time.Timer
+}
+
+// ManagerOptions is a collection of options used by
+// NewManager.
+type ManagerOptions struct {
+	Enforcer Enforcer
+	Timeout  time.Duration
+	Logger   grpclog.LoggerV2
+}
+
+// NewManager creates a new idleness manager implementation for the
+// given idle timeout.
+func NewManager(opts ManagerOptions) Manager {
+	if opts.Timeout == 0 {
+		return noopManager{}
+	}
+
+	m := &manager{
+		enforcer: opts.Enforcer,
+		timeout:  int64(opts.Timeout),
+		logger:   opts.Logger,
+	}
+	m.timer = timeAfterFunc(opts.Timeout, m.handleIdleTimeout)
+	return m
+}
+
+// resetIdleTimer resets the idle timer to the given duration. This method
+// should only be called from the timer callback.
+func (m *manager) resetIdleTimer(d time.Duration) {
+	m.idleMu.Lock()
+	defer m.idleMu.Unlock()
+
+	if m.timer == nil {
+		// Only close sets timer to nil. We are done.
+		return
+	}
+
+	// It is safe to ignore the return value from Reset() because this method is
+	// only ever called from the timer callback, which means the timer has
+	// already fired.
+	m.timer.Reset(d)
+}
+
+// handleIdleTimeout is the timer callback that is invoked upon expiry of the
+// configured idle timeout. The channel is considered inactive if there are no
+// ongoing calls and no RPC activity since the last time the timer fired.
+func (m *manager) handleIdleTimeout() {
+	if m.isClosed() {
+		return
+	}
+
+	if atomic.LoadInt32(&m.activeCallsCount) > 0 {
+		m.resetIdleTimer(time.Duration(m.timeout))
+		return
+	}
+
+	// There has been activity on the channel since we last got here. Reset the
+	// timer and return.
+	if atomic.LoadInt32(&m.activeSinceLastTimerCheck) == 1 {
+		// Set the timer to fire after a duration of idle timeout, calculated
+		// from the time the most recent RPC completed.
+		atomic.StoreInt32(&m.activeSinceLastTimerCheck, 0)
+		m.resetIdleTimer(time.Duration(atomic.LoadInt64(&m.lastCallEndTime) + m.timeout - time.Now().UnixNano()))
+		return
+	}
+
+	// This CAS operation is extremely likely to succeed given that there has
+	// been no activity since the last time we were here.  Setting the
+	// activeCallsCount to -math.MaxInt32 indicates to OnCallBegin() that the
+	// channel is either in idle mode or is trying to get there.
+	if !atomic.CompareAndSwapInt32(&m.activeCallsCount, 0, -math.MaxInt32) {
+		// This CAS operation can fail if an RPC started after we checked for
+		// activity at the top of this method, or one was ongoing from before
+		// the last time we were here. In both case, reset the timer and return.
+		m.resetIdleTimer(time.Duration(m.timeout))
+		return
+	}
+
+	// Now that we've set the active calls count to -math.MaxInt32, it's time to
+	// actually move to idle mode.
+	if m.tryEnterIdleMode() {
+		// Successfully entered idle mode. No timer needed until we exit idle.
+		return
+	}
+
+	// Failed to enter idle mode due to a concurrent RPC that kept the channel
+	// active, or because of an error from the channel. Undo the attempt to
+	// enter idle, and reset the timer to try again later.
+	atomic.AddInt32(&m.activeCallsCount, math.MaxInt32)
+	m.resetIdleTimer(time.Duration(m.timeout))
+}
+
+// tryEnterIdleMode instructs the channel to enter idle mode. But before
+// that, it performs a last minute check to ensure that no new RPC has come in,
+// making the channel active.
+//
+// Return value indicates whether or not the channel moved to idle mode.
+//
+// Holds idleMu which ensures mutual exclusion with exitIdleMode.
+func (m *manager) tryEnterIdleMode() bool {
+	m.idleMu.Lock()
+	defer m.idleMu.Unlock()
+
+	if atomic.LoadInt32(&m.activeCallsCount) != -math.MaxInt32 {
+		// We raced and lost to a new RPC. Very rare, but stop entering idle.
+		return false
+	}
+	if atomic.LoadInt32(&m.activeSinceLastTimerCheck) == 1 {
+		// An very short RPC could have come in (and also finished) after we
+		// checked for calls count and activity in handleIdleTimeout(), but
+		// before the CAS operation. So, we need to check for activity again.
+		return false
+	}
+
+	// No new RPCs have come in since we last set the active calls count value
+	// -math.MaxInt32 in the timer callback. And since we have the lock, it is
+	// safe to enter idle mode now.
+	if err := m.enforcer.EnterIdleMode(); err != nil {
+		m.logger.Errorf("Failed to enter idle mode: %v", err)
+		return false
+	}
+
+	// Successfully entered idle mode.
+	m.actuallyIdle = true
+	return true
+}
+
+// OnCallBegin is invoked at the start of every RPC.
+func (m *manager) OnCallBegin() error {
+	if m.isClosed() {
+		return nil
+	}
+
+	if atomic.AddInt32(&m.activeCallsCount, 1) > 0 {
+		// Channel is not idle now. Set the activity bit and allow the call.
+		atomic.StoreInt32(&m.activeSinceLastTimerCheck, 1)
+		return nil
+	}
+
+	// Channel is either in idle mode or is in the process of moving to idle
+	// mode. Attempt to exit idle mode to allow this RPC.
+	if err := m.exitIdleMode(); err != nil {
+		// Undo the increment to calls count, and return an error causing the
+		// RPC to fail.
+		atomic.AddInt32(&m.activeCallsCount, -1)
+		return err
+	}
+
+	atomic.StoreInt32(&m.activeSinceLastTimerCheck, 1)
+	return nil
+}
+
+// exitIdleMode instructs the channel to exit idle mode.
+//
+// Holds idleMu which ensures mutual exclusion with tryEnterIdleMode.
+func (m *manager) exitIdleMode() error {
+	m.idleMu.Lock()
+	defer m.idleMu.Unlock()
+
+	if !m.actuallyIdle {
+		// This can happen in two scenarios:
+		// - handleIdleTimeout() set the calls count to -math.MaxInt32 and called
+		//   tryEnterIdleMode(). But before the latter could grab the lock, an RPC
+		//   came in and OnCallBegin() noticed that the calls count is negative.
+		// - Channel is in idle mode, and multiple new RPCs come in at the same
+		//   time, all of them notice a negative calls count in OnCallBegin and get
+		//   here. The first one to get the lock would got the channel to exit idle.
+		//
+		// Either way, nothing to do here.
+		return nil
+	}
+
+	if err := m.enforcer.ExitIdleMode(); err != nil {
+		return fmt.Errorf("channel failed to exit idle mode: %v", err)
+	}
+
+	// Undo the idle entry process. This also respects any new RPC attempts.
+	atomic.AddInt32(&m.activeCallsCount, math.MaxInt32)
+	m.actuallyIdle = false
+
+	// Start a new timer to fire after the configured idle timeout.
+	m.timer = timeAfterFunc(time.Duration(m.timeout), m.handleIdleTimeout)
+	return nil
+}
+
+// OnCallEnd is invoked at the end of every RPC.
+func (m *manager) OnCallEnd() {
+	if m.isClosed() {
+		return
+	}
+
+	// Record the time at which the most recent call finished.
+	atomic.StoreInt64(&m.lastCallEndTime, time.Now().UnixNano())
+
+	// Decrement the active calls count. This count can temporarily go negative
+	// when the timer callback is in the process of moving the channel to idle
+	// mode, but one or more RPCs come in and complete before the timer callback
+	// can get done with the process of moving to idle mode.
+	atomic.AddInt32(&m.activeCallsCount, -1)
+}
+
+func (m *manager) isClosed() bool {
+	return atomic.LoadInt32(&m.closed) == 1
+}
+
+func (m *manager) Close() {
+	atomic.StoreInt32(&m.closed, 1)
+
+	m.idleMu.Lock()
+	m.timer.Stop()
+	m.timer = nil
+	m.idleMu.Unlock()
+}

vendor/google.golang.org/grpc/internal/internal.go

@@ -30,7 +30,7 @@ import (
 
 var (
 	// WithHealthCheckFunc is set by dialoptions.go
-	WithHealthCheckFunc interface{} // func (HealthChecker) DialOption
+	WithHealthCheckFunc any // func (HealthChecker) DialOption
 	// HealthCheckFunc is used to provide client-side LB channel health checking
 	HealthCheckFunc HealthChecker
 	// BalancerUnregister is exported by package balancer to unregister a balancer.
@@ -38,8 +38,12 @@ 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
+	// KeepaliveMinServerPingTime is the minimum ping interval for servers.
+	// This must be 1s by default, but tests may wish to set it lower for
+	// convenience.
+	KeepaliveMinServerPingTime = time.Second
 	// ParseServiceConfig parses a JSON representation of the service config.
-	ParseServiceConfig interface{} // func(string) *serviceconfig.ParseResult
+	ParseServiceConfig any // func(string) *serviceconfig.ParseResult
 	// EqualServiceConfigForTesting is for testing service config generation and
 	// parsing. Both a and b should be returned by ParseServiceConfig.
 	// This function compares the config without rawJSON stripped, in case the
@@ -49,33 +53,33 @@ var (
 	// given name. This is set by package certprovider for use from xDS
 	// bootstrap code while parsing certificate provider configs in the
 	// bootstrap file.
-	GetCertificateProviderBuilder interface{} // func(string) certprovider.Builder
+	GetCertificateProviderBuilder any // 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
+	GetXDSHandshakeInfoForTesting any // 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
+	GetServerCredentials any // func (*grpc.Server) credentials.TransportCredentials
 	// CanonicalString returns the canonical string of the code defined here:
 	// https://github.com/grpc/grpc/blob/master/doc/statuscodes.md.
 	//
 	// This is used in the 1.0 release of gcp/observability, and thus must not be
 	// deleted or changed.
-	CanonicalString interface{} // func (codes.Code) string
+	CanonicalString any // func (codes.Code) string
 	// 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)
+	DrainServerTransports any // func(*grpc.Server, string)
 	// AddGlobalServerOptions adds an array of ServerOption that will be
 	// effective globally for newly created servers. The priority will be: 1.
 	// user-provided; 2. this method; 3. default values.
 	//
 	// This is used in the 1.0 release of gcp/observability, and thus must not be
 	// deleted or changed.
-	AddGlobalServerOptions interface{} // func(opt ...ServerOption)
+	AddGlobalServerOptions any // func(opt ...ServerOption)
 	// ClearGlobalServerOptions clears the array of extra ServerOption. This
 	// method is useful in testing and benchmarking.
 	//
@@ -88,14 +92,14 @@ var (
 	//
 	// This is used in the 1.0 release of gcp/observability, and thus must not be
 	// deleted or changed.
-	AddGlobalDialOptions interface{} // func(opt ...DialOption)
+	AddGlobalDialOptions any // func(opt ...DialOption)
 	// DisableGlobalDialOptions returns a DialOption that prevents the
 	// ClientConn from applying the global DialOptions (set via
 	// AddGlobalDialOptions).
 	//
 	// This is used in the 1.0 release of gcp/observability, and thus must not be
 	// deleted or changed.
-	DisableGlobalDialOptions interface{} // func() grpc.DialOption
+	DisableGlobalDialOptions any // func() grpc.DialOption
 	// ClearGlobalDialOptions clears the array of extra DialOption. This
 	// method is useful in testing and benchmarking.
 	//
@@ -104,23 +108,26 @@ var (
 	ClearGlobalDialOptions func()
 	// JoinDialOptions combines the dial options passed as arguments into a
 	// single dial option.
-	JoinDialOptions interface{} // func(...grpc.DialOption) grpc.DialOption
+	JoinDialOptions any // func(...grpc.DialOption) grpc.DialOption
 	// JoinServerOptions combines the server options passed as arguments into a
 	// single server option.
-	JoinServerOptions interface{} // func(...grpc.ServerOption) grpc.ServerOption
+	JoinServerOptions any // func(...grpc.ServerOption) grpc.ServerOption
 
 	// WithBinaryLogger returns a DialOption that specifies the binary logger
 	// for a ClientConn.
 	//
 	// This is used in the 1.0 release of gcp/observability, and thus must not be
 	// deleted or changed.
-	WithBinaryLogger interface{} // func(binarylog.Logger) grpc.DialOption
+	WithBinaryLogger any // func(binarylog.Logger) grpc.DialOption
 	// BinaryLogger returns a ServerOption that can set the binary logger for a
 	// server.
 	//
 	// This is used in the 1.0 release of gcp/observability, and thus must not be
 	// deleted or changed.
-	BinaryLogger interface{} // func(binarylog.Logger) grpc.ServerOption
+	BinaryLogger any // func(binarylog.Logger) grpc.ServerOption
+
+	// SubscribeToConnectivityStateChanges adds a grpcsync.Subscriber to a provided grpc.ClientConn
+	SubscribeToConnectivityStateChanges any // func(*grpc.ClientConn, grpcsync.Subscriber)
 
 	// NewXDSResolverWithConfigForTesting creates a new xds resolver builder using
 	// the provided xds bootstrap config instead of the global configuration from
@@ -131,7 +138,7 @@ var (
 	//
 	// This function should ONLY be used for testing and may not work with some
 	// other features, including the CSDS service.
-	NewXDSResolverWithConfigForTesting interface{} // func([]byte) (resolver.Builder, error)
+	NewXDSResolverWithConfigForTesting any // func([]byte) (resolver.Builder, error)
 
 	// RegisterRLSClusterSpecifierPluginForTesting registers the RLS Cluster
 	// Specifier Plugin for testing purposes, regardless of the XDSRLS environment
@@ -163,7 +170,11 @@ var (
 	UnregisterRBACHTTPFilterForTesting func()
 
 	// ORCAAllowAnyMinReportingInterval is for examples/orca use ONLY.
-	ORCAAllowAnyMinReportingInterval interface{} // func(so *orca.ServiceOptions)
+	ORCAAllowAnyMinReportingInterval any // func(so *orca.ServiceOptions)
+
+	// GRPCResolverSchemeExtraMetadata determines when gRPC will add extra
+	// metadata to RPCs.
+	GRPCResolverSchemeExtraMetadata string = "xds"
 )
 
 // HealthChecker defines the signature of the client-side LB channel health checking function.
@@ -174,7 +185,7 @@ var (
 //
 // The health checking protocol is defined at:
 // https://github.com/grpc/grpc/blob/master/doc/health-checking.md
-type HealthChecker func(ctx context.Context, newStream func(string) (interface{}, error), setConnectivityState func(connectivity.State, error), serviceName string) error
+type HealthChecker func(ctx context.Context, newStream func(string) (any, error), setConnectivityState func(connectivity.State, error), serviceName string) error
 
 const (
 	// CredsBundleModeFallback switches GoogleDefaultCreds to fallback mode.

vendor/google.golang.org/grpc/internal/metadata/metadata.go

@@ -35,7 +35,7 @@ const mdKey = mdKeyType("grpc.internal.address.metadata")
 
 type mdValue metadata.MD
 
-func (m mdValue) Equal(o interface{}) bool {
+func (m mdValue) Equal(o any) bool {
 	om, ok := o.(mdValue)
 	if !ok {
 		return false

vendor/google.golang.org/grpc/internal/pretty/pretty.go

@@ -35,7 +35,7 @@ const jsonIndent = "  "
 // ToJSON marshals the input into a json string.
 //
 // If marshal fails, it falls back to fmt.Sprintf("%+v").
-func ToJSON(e interface{}) string {
+func ToJSON(e any) string {
 	switch ee := e.(type) {
 	case protov1.Message:
 		mm := jsonpb.Marshaler{Indent: jsonIndent}

vendor/google.golang.org/grpc/internal/resolver/config_selector.go

@@ -92,7 +92,7 @@ type ClientStream interface {
 	// 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
+	SendMsg(m any) 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
@@ -101,7 +101,7 @@ type ClientStream interface {
 	// 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
+	RecvMsg(m any) error
 }
 
 // ClientInterceptor is an interceptor for gRPC client streams.

vendor/google.golang.org/grpc/internal/status/status.go

@@ -49,7 +49,7 @@ func New(c codes.Code, msg string) *Status {
 }
 
 // Newf returns New(c, fmt.Sprintf(format, a...)).
-func Newf(c codes.Code, format string, a ...interface{}) *Status {
+func Newf(c codes.Code, format string, a ...any) *Status {
 	return New(c, fmt.Sprintf(format, a...))
 }
 
@@ -64,7 +64,7 @@ func Err(c codes.Code, msg string) error {
 }
 
 // Errorf returns Error(c, fmt.Sprintf(format, a...)).
-func Errorf(c codes.Code, format string, a ...interface{}) error {
+func Errorf(c codes.Code, format string, a ...any) error {
 	return Err(c, fmt.Sprintf(format, a...))
 }
 
@@ -120,11 +120,11 @@ func (s *Status) WithDetails(details ...proto.Message) (*Status, error) {
 
 // Details returns a slice of details messages attached to the status.
 // If a detail cannot be decoded, the error is returned in place of the detail.
-func (s *Status) Details() []interface{} {
+func (s *Status) Details() []any {
 	if s == nil || s.s == nil {
 		return nil
 	}
-	details := make([]interface{}, 0, len(s.s.Details))
+	details := make([]any, 0, len(s.s.Details))
 	for _, any := range s.s.Details {
 		detail := &ptypes.DynamicAny{}
 		if err := ptypes.UnmarshalAny(any, detail); err != nil {

vendor/google.golang.org/grpc/internal/transport/controlbuf.go

@@ -40,7 +40,7 @@ var updateHeaderTblSize = func(e *hpack.Encoder, v uint32) {
 }
 
 type itemNode struct {
-	it   interface{}
+	it   any
 	next *itemNode
 }
 
@@ -49,7 +49,7 @@ type itemList struct {
 	tail *itemNode
 }
 
-func (il *itemList) enqueue(i interface{}) {
+func (il *itemList) enqueue(i any) {
 	n := &itemNode{it: i}
 	if il.tail == nil {
 		il.head, il.tail = n, n
@@ -61,11 +61,11 @@ func (il *itemList) enqueue(i interface{}) {
 
 // peek returns the first item in the list without removing it from the
 // list.
-func (il *itemList) peek() interface{} {
+func (il *itemList) peek() any {
 	return il.head.it
 }
 
-func (il *itemList) dequeue() interface{} {
+func (il *itemList) dequeue() any {
 	if il.head == nil {
 		return nil
 	}
@@ -336,7 +336,7 @@ func (c *controlBuffer) put(it cbItem) error {
 	return err
 }
 
-func (c *controlBuffer) executeAndPut(f func(it interface{}) bool, it cbItem) (bool, error) {
+func (c *controlBuffer) executeAndPut(f func(it any) bool, it cbItem) (bool, error) {
 	var wakeUp bool
 	c.mu.Lock()
 	if c.err != nil {
@@ -373,7 +373,7 @@ func (c *controlBuffer) executeAndPut(f func(it interface{}) bool, it cbItem) (b
 }
 
 // Note argument f should never be nil.
-func (c *controlBuffer) execute(f func(it interface{}) bool, it interface{}) (bool, error) {
+func (c *controlBuffer) execute(f func(it any) bool, it any) (bool, error) {
 	c.mu.Lock()
 	if c.err != nil {
 		c.mu.Unlock()
@@ -387,7 +387,7 @@ func (c *controlBuffer) execute(f func(it interface{}) bool, it interface{}) (bo
 	return true, nil
 }
 
-func (c *controlBuffer) get(block bool) (interface{}, error) {
+func (c *controlBuffer) get(block bool) (any, error) {
 	for {
 		c.mu.Lock()
 		if c.err != nil {
@@ -830,7 +830,7 @@ func (l *loopyWriter) goAwayHandler(g *goAway) error {
 	return nil
 }
 
-func (l *loopyWriter) handle(i interface{}) error {
+func (l *loopyWriter) handle(i any) error {
 	switch i := i.(type) {
 	case *incomingWindowUpdate:
 		l.incomingWindowUpdateHandler(i)

vendor/google.golang.org/grpc/internal/transport/http2_client.go

@@ -330,7 +330,7 @@ func newHTTP2Client(connectCtx, ctx context.Context, addr resolver.Address, opts
 		readerDone:            make(chan struct{}),
 		writerDone:            make(chan struct{}),
 		goAway:                make(chan struct{}),
-		framer:                newFramer(conn, writeBufSize, readBufSize, maxHeaderListSize),
+		framer:                newFramer(conn, writeBufSize, readBufSize, opts.SharedWriteBuffer, maxHeaderListSize),
 		fc:                    &trInFlow{limit: uint32(icwz)},
 		scheme:                scheme,
 		activeStreams:         make(map[uint32]*Stream),
@@ -762,7 +762,7 @@ func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (*Stream,
 	firstTry := true
 	var ch chan struct{}
 	transportDrainRequired := false
-	checkForStreamQuota := func(it interface{}) bool {
+	checkForStreamQuota := func(it any) bool {
 		if t.streamQuota <= 0 { // Can go negative if server decreases it.
 			if firstTry {
 				t.waitingStreams++
@@ -800,7 +800,7 @@ func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (*Stream,
 		return true
 	}
 	var hdrListSizeErr error
-	checkForHeaderListSize := func(it interface{}) bool {
+	checkForHeaderListSize := func(it any) bool {
 		if t.maxSendHeaderListSize == nil {
 			return true
 		}
@@ -815,7 +815,7 @@ func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (*Stream,
 		return true
 	}
 	for {
-		success, err := t.controlBuf.executeAndPut(func(it interface{}) bool {
+		success, err := t.controlBuf.executeAndPut(func(it any) bool {
 			return checkForHeaderListSize(it) && checkForStreamQuota(it)
 		}, hdr)
 		if err != nil {
@@ -927,7 +927,7 @@ func (t *http2Client) closeStream(s *Stream, err error, rst bool, rstCode http2.
 		rst:     rst,
 		rstCode: rstCode,
 	}
-	addBackStreamQuota := func(interface{}) bool {
+	addBackStreamQuota := func(any) bool {
 		t.streamQuota++
 		if t.streamQuota > 0 && t.waitingStreams > 0 {
 			select {
@@ -1080,7 +1080,7 @@ func (t *http2Client) updateWindow(s *Stream, n uint32) {
 // for the transport and the stream based on the current bdp
 // estimation.
 func (t *http2Client) updateFlowControl(n uint32) {
-	updateIWS := func(interface{}) bool {
+	updateIWS := func(any) bool {
 		t.initialWindowSize = int32(n)
 		t.mu.Lock()
 		for _, s := range t.activeStreams {
@@ -1233,7 +1233,7 @@ func (t *http2Client) handleSettings(f *http2.SettingsFrame, isFirst bool) {
 		}
 		updateFuncs = append(updateFuncs, updateStreamQuota)
 	}
-	t.controlBuf.executeAndPut(func(interface{}) bool {
+	t.controlBuf.executeAndPut(func(any) bool {
 		for _, f := range updateFuncs {
 			f()
 		}
@@ -1505,14 +1505,15 @@ func (t *http2Client) operateHeaders(frame *http2.MetaHeadersFrame) {
 		return
 	}
 
-	isHeader := false
-
-	// If headerChan hasn't been closed yet
-	if atomic.CompareAndSwapUint32(&s.headerChanClosed, 0, 1) {
-		s.headerValid = true
-		if !endStream {
-			// HEADERS frame block carries a Response-Headers.
-			isHeader = true
+	// For headers, set them in s.header and close headerChan.  For trailers or
+	// trailers-only, closeStream will set the trailers and close headerChan as
+	// needed.
+	if !endStream {
+		// If headerChan hasn't been closed yet (expected, given we checked it
+		// above, but something else could have potentially closed the whole
+		// stream).
+		if atomic.CompareAndSwapUint32(&s.headerChanClosed, 0, 1) {
+			s.headerValid = true
 			// These values can be set without any synchronization because
 			// stream goroutine will read it only after seeing a closed
 			// headerChan which we'll close after setting this.
@@ -1520,15 +1521,12 @@ func (t *http2Client) operateHeaders(frame *http2.MetaHeadersFrame) {
 			if len(mdata) > 0 {
 				s.header = mdata
 			}
-		} else {
-			// HEADERS frame block carries a Trailers-Only.
-			s.noHeaders = true
+			close(s.headerChan)
 		}
-		close(s.headerChan)
 	}
 
 	for _, sh := range t.statsHandlers {
-		if isHeader {
+		if !endStream {
 			inHeader := &stats.InHeader{
 				Client:      true,
 				WireLength:  int(frame.Header().Length),
@@ -1554,9 +1552,10 @@ func (t *http2Client) operateHeaders(frame *http2.MetaHeadersFrame) {
 		statusGen = status.New(rawStatusCode, grpcMessage)
 	}
 
-	// if client received END_STREAM from server while stream was still active, send RST_STREAM
-	rst := s.getState() == streamActive
-	t.closeStream(s, io.EOF, rst, http2.ErrCodeNo, statusGen, mdata, true)
+	// If client received END_STREAM from server while stream was still active,
+	// send RST_STREAM.
+	rstStream := s.getState() == streamActive
+	t.closeStream(s, io.EOF, rstStream, http2.ErrCodeNo, statusGen, mdata, true)
 }
 
 // readServerPreface reads and handles the initial settings frame from the

vendor/google.golang.org/grpc/internal/transport/http2_server.go

@@ -165,7 +165,7 @@ func NewServerTransport(conn net.Conn, config *ServerConfig) (_ ServerTransport,
 	if config.MaxHeaderListSize != nil {
 		maxHeaderListSize = *config.MaxHeaderListSize
 	}
-	framer := newFramer(conn, writeBufSize, readBufSize, maxHeaderListSize)
+	framer := newFramer(conn, writeBufSize, readBufSize, config.SharedWriteBuffer, maxHeaderListSize)
 	// Send initial settings as connection preface to client.
 	isettings := []http2.Setting{{
 		ID:  http2.SettingMaxFrameSize,
@@ -855,7 +855,7 @@ func (t *http2Server) handleSettings(f *http2.SettingsFrame) {
 		}
 		return nil
 	})
-	t.controlBuf.executeAndPut(func(interface{}) bool {
+	t.controlBuf.executeAndPut(func(any) bool {
 		for _, f := range updateFuncs {
 			f()
 		}
@@ -939,7 +939,7 @@ func appendHeaderFieldsFromMD(headerFields []hpack.HeaderField, md metadata.MD)
 	return headerFields
 }
 
-func (t *http2Server) checkForHeaderListSize(it interface{}) bool {
+func (t *http2Server) checkForHeaderListSize(it any) bool {
 	if t.maxSendHeaderListSize == nil {
 		return true
 	}

vendor/google.golang.org/grpc/internal/transport/http_util.go

@@ -30,6 +30,7 @@ import (
 	"net/url"
 	"strconv"
 	"strings"
+	"sync"
 	"time"
 	"unicode/utf8"
 
@@ -309,6 +310,7 @@ func decodeGrpcMessageUnchecked(msg string) string {
 }
 
 type bufWriter struct {
+	pool      *sync.Pool
 	buf       []byte
 	offset    int
 	batchSize int
@@ -316,12 +318,17 @@ type bufWriter struct {
 	err       error
 }
 
-func newBufWriter(conn net.Conn, batchSize int) *bufWriter {
-	return &bufWriter{
-		buf:       make([]byte, batchSize*2),
+func newBufWriter(conn net.Conn, batchSize int, pool *sync.Pool) *bufWriter {
+	w := &bufWriter{
 		batchSize: batchSize,
 		conn:      conn,
+		pool:      pool,
 	}
+	// this indicates that we should use non shared buf
+	if pool == nil {
+		w.buf = make([]byte, batchSize)
+	}
+	return w
 }
 
 func (w *bufWriter) Write(b []byte) (n int, err error) {
@@ -332,19 +339,34 @@ func (w *bufWriter) Write(b []byte) (n int, err error) {
 		n, err = w.conn.Write(b)
 		return n, toIOError(err)
 	}
+	if w.buf == nil {
+		b := w.pool.Get().(*[]byte)
+		w.buf = *b
+	}
 	for len(b) > 0 {
 		nn := copy(w.buf[w.offset:], b)
 		b = b[nn:]
 		w.offset += nn
 		n += nn
 		if w.offset >= w.batchSize {
-			err = w.Flush()
+			err = w.flushKeepBuffer()
 		}
 	}
 	return n, err
 }
 
 func (w *bufWriter) Flush() error {
+	err := w.flushKeepBuffer()
+	// Only release the buffer if we are in a "shared" mode
+	if w.buf != nil && w.pool != nil {
+		b := w.buf
+		w.pool.Put(&b)
+		w.buf = nil
+	}
+	return err
+}
+
+func (w *bufWriter) flushKeepBuffer() error {
 	if w.err != nil {
 		return w.err
 	}
@@ -381,7 +403,10 @@ type framer struct {
 	fr     *http2.Framer
 }
 
-func newFramer(conn net.Conn, writeBufferSize, readBufferSize int, maxHeaderListSize uint32) *framer {
+var writeBufferPoolMap map[int]*sync.Pool = make(map[int]*sync.Pool)
+var writeBufferMutex sync.Mutex
+
+func newFramer(conn net.Conn, writeBufferSize, readBufferSize int, sharedWriteBuffer bool, maxHeaderListSize uint32) *framer {
 	if writeBufferSize < 0 {
 		writeBufferSize = 0
 	}
@@ -389,7 +414,11 @@ func newFramer(conn net.Conn, writeBufferSize, readBufferSize int, maxHeaderList
 	if readBufferSize > 0 {
 		r = bufio.NewReaderSize(r, readBufferSize)
 	}
-	w := newBufWriter(conn, writeBufferSize)
+	var pool *sync.Pool
+	if sharedWriteBuffer {
+		pool = getWriteBufferPool(writeBufferSize)
+	}
+	w := newBufWriter(conn, writeBufferSize, pool)
 	f := &framer{
 		writer: w,
 		fr:     http2.NewFramer(w, r),
@@ -403,6 +432,24 @@ func newFramer(conn net.Conn, writeBufferSize, readBufferSize int, maxHeaderList
 	return f
 }
 
+func getWriteBufferPool(writeBufferSize int) *sync.Pool {
+	writeBufferMutex.Lock()
+	defer writeBufferMutex.Unlock()
+	size := writeBufferSize * 2
+	pool, ok := writeBufferPoolMap[size]
+	if ok {
+		return pool
+	}
+	pool = &sync.Pool{
+		New: func() any {
+			b := make([]byte, size)
+			return &b
+		},
+	}
+	writeBufferPoolMap[size] = pool
+	return pool
+}
+
 // parseDialTarget returns the network and address to pass to dialer.
 func parseDialTarget(target string) (string, string) {
 	net := "tcp"

vendor/google.golang.org/grpc/internal/transport/transport.go

@@ -43,10 +43,6 @@ import (
 	"google.golang.org/grpc/tap"
 )
 
-// ErrNoHeaders is used as a signal that a trailers only response was received,
-// and is not a real error.
-var ErrNoHeaders = errors.New("stream has no headers")
-
 const logLevel = 2
 
 type bufferPool struct {
@@ -56,7 +52,7 @@ type bufferPool struct {
 func newBufferPool() *bufferPool {
 	return &bufferPool{
 		pool: sync.Pool{
-			New: func() interface{} {
+			New: func() any {
 				return new(bytes.Buffer)
 			},
 		},
@@ -390,14 +386,10 @@ func (s *Stream) Header() (metadata.MD, error) {
 	}
 	s.waitOnHeader()
 
-	if !s.headerValid {
+	if !s.headerValid || s.noHeaders {
 		return nil, s.status.Err()
 	}
 
-	if s.noHeaders {
-		return nil, ErrNoHeaders
-	}
-
 	return s.header.Copy(), nil
 }
 
@@ -559,6 +551,7 @@ type ServerConfig struct {
 	InitialConnWindowSize int32
 	WriteBufferSize       int
 	ReadBufferSize        int
+	SharedWriteBuffer     bool
 	ChannelzParentID      *channelz.Identifier
 	MaxHeaderListSize     *uint32
 	HeaderTableSize       *uint32
@@ -592,6 +585,8 @@ type ConnectOptions struct {
 	WriteBufferSize int
 	// ReadBufferSize sets the size of read buffer, which in turn determines how much data can be read at most for one read syscall.
 	ReadBufferSize int
+	// SharedWriteBuffer indicates whether connections should reuse write buffer
+	SharedWriteBuffer bool
 	// ChannelzParentID sets the addrConn id which initiate the creation of this client transport.
 	ChannelzParentID *channelz.Identifier
 	// MaxHeaderListSize sets the max (uncompressed) size of header list that is prepared to be received.
@@ -736,7 +731,7 @@ type ServerTransport interface {
 }
 
 // connectionErrorf creates an ConnectionError with the specified error description.
-func connectionErrorf(temp bool, e error, format string, a ...interface{}) ConnectionError {
+func connectionErrorf(temp bool, e error, format string, a ...any) ConnectionError {
 	return ConnectionError{
 		Desc: fmt.Sprintf(format, a...),
 		temp: temp,