rebase: Bump google.golang.org/grpc from 1.56.2 to 1.57.0

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.56.2 to 1.57.0.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](https://github.com/grpc/grpc-go/compare/v1.56.2...v1.57.0)

---
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/envconfig/envconfig.go

@@ -40,6 +40,9 @@ var (
 	// 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)
+	// ALTSMaxConcurrentHandshakes is the maximum number of concurrent ALTS
+	// handshakes that can be performed.
+	ALTSMaxConcurrentHandshakes = uint64FromEnv("GRPC_ALTS_MAX_CONCURRENT_HANDSHAKES", 100, 1, 100)
 )
 
 func boolFromEnv(envVar string, def bool) bool {

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

@@ -80,6 +80,13 @@ func Uint32() uint32 {
 	return r.Uint32()
 }
 
+// ExpFloat64 implements rand.ExpFloat64 on the grpcrand global source.
+func ExpFloat64() float64 {
+	mu.Lock()
+	defer mu.Unlock()
+	return r.ExpFloat64()
+}
+
 // Shuffle implements rand.Shuffle on the grpcrand global source.
 var Shuffle = func(n int, f func(int, int)) {
 	mu.Lock()

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

@@ -0,0 +1,136 @@
+/*
+ *
+ * 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 grpcsync
+
+import (
+	"context"
+	"sync"
+)
+
+// Subscriber represents an entity that is subscribed to messages published on
+// a PubSub. It wraps the callback to be invoked by the PubSub when a new
+// message is published.
+type Subscriber interface {
+	// OnMessage is invoked when a new message is published. Implementations
+	// must not block in this method.
+	OnMessage(msg interface{})
+}
+
+// PubSub is a simple one-to-many publish-subscribe system that supports
+// messages of arbitrary type. It guarantees that messages are delivered in
+// the same order in which they were published.
+//
+// Publisher invokes the Publish() method to publish new messages, while
+// 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.
+type PubSub struct {
+	cs     *CallbackSerializer
+	cancel context.CancelFunc
+
+	// Access to the below fields are guarded by this mutex.
+	mu          sync.Mutex
+	msg         interface{}
+	subscribers map[Subscriber]bool
+	stopped     bool
+}
+
+// NewPubSub returns a new PubSub instance.
+func NewPubSub() *PubSub {
+	ctx, cancel := context.WithCancel(context.Background())
+	return &PubSub{
+		cs:          NewCallbackSerializer(ctx),
+		cancel:      cancel,
+		subscribers: map[Subscriber]bool{},
+	}
+}
+
+// Subscribe registers the provided Subscriber to the PubSub.
+//
+// If the PubSub contains a previously published message, the Subscriber's
+// OnMessage() callback will be invoked asynchronously with the existing
+// message to begin with, and subsequently for every newly published message.
+//
+// The caller is responsible for invoking the returned cancel function to
+// unsubscribe itself from the PubSub.
+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 {
+		msg := ps.msg
+		ps.cs.Schedule(func(context.Context) {
+			ps.mu.Lock()
+			defer ps.mu.Unlock()
+			if !ps.subscribers[sub] {
+				return
+			}
+			sub.OnMessage(msg)
+		})
+	}
+
+	return func() {
+		ps.mu.Lock()
+		defer ps.mu.Unlock()
+		delete(ps.subscribers, sub)
+	}
+}
+
+// Publish publishes the provided message to the PubSub, and invokes
+// callbacks registered by subscribers asynchronously.
+func (ps *PubSub) Publish(msg interface{}) {
+	ps.mu.Lock()
+	defer ps.mu.Unlock()
+
+	if ps.stopped {
+		return
+	}
+
+	ps.msg = msg
+	for sub := range ps.subscribers {
+		s := sub
+		ps.cs.Schedule(func(context.Context) {
+			ps.mu.Lock()
+			defer ps.mu.Unlock()
+			if !ps.subscribers[s] {
+				return
+			}
+			s.OnMessage(msg)
+		})
+	}
+}
+
+// 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()
+}

vendor/google.golang.org/grpc/internal/resolver/dns/dns_resolver.go

@@ -62,7 +62,8 @@ const (
 	defaultPort       = "443"
 	defaultDNSSvrPort = "53"
 	golang            = "GO"
-	// txtPrefix is the prefix string to be prepended to the host name for txt record lookup.
+	// txtPrefix is the prefix string to be prepended to the host name for txt
+	// record lookup.
 	txtPrefix = "_grpc_config."
 	// In DNS, service config is encoded in a TXT record via the mechanism
 	// described in RFC-1464 using the attribute name grpc_config.
@@ -86,14 +87,14 @@ var (
 	minDNSResRate = 30 * time.Second
 )
 
-var customAuthorityDialler = func(authority string) func(ctx context.Context, network, address string) (net.Conn, error) {
-	return func(ctx context.Context, network, address string) (net.Conn, error) {
+var addressDialer = func(address string) func(context.Context, string, string) (net.Conn, error) {
+	return func(ctx context.Context, network, _ string) (net.Conn, error) {
 		var dialer net.Dialer
-		return dialer.DialContext(ctx, network, authority)
+		return dialer.DialContext(ctx, network, address)
 	}
 }
 
-var customAuthorityResolver = func(authority string) (netResolver, error) {
+var newNetResolver = func(authority string) (netResolver, error) {
 	host, port, err := parseTarget(authority, defaultDNSSvrPort)
 	if err != nil {
 		return nil, err
@@ -103,7 +104,7 @@ var customAuthorityResolver = func(authority string) (netResolver, error) {
 
 	return &net.Resolver{
 		PreferGo: true,
-		Dial:     customAuthorityDialler(authorityWithPort),
+		Dial:     addressDialer(authorityWithPort),
 	}, nil
 }
 
@@ -114,7 +115,8 @@ func NewBuilder() resolver.Builder {
 
 type dnsBuilder struct{}
 
-// Build creates and starts a DNS resolver that watches the name resolution of the target.
+// Build creates and starts a DNS resolver that watches the name resolution of
+// the target.
 func (b *dnsBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) {
 	host, port, err := parseTarget(target.Endpoint(), defaultPort)
 	if err != nil {
@@ -143,7 +145,7 @@ func (b *dnsBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts
 	if target.URL.Host == "" {
 		d.resolver = defaultResolver
 	} else {
-		d.resolver, err = customAuthorityResolver(target.URL.Host)
+		d.resolver, err = newNetResolver(target.URL.Host)
 		if err != nil {
 			return nil, err
 		}
@@ -180,19 +182,22 @@ type dnsResolver struct {
 	ctx      context.Context
 	cancel   context.CancelFunc
 	cc       resolver.ClientConn
-	// rn channel is used by ResolveNow() to force an immediate resolution of the target.
+	// rn channel is used by ResolveNow() to force an immediate resolution of the
+	// target.
 	rn chan struct{}
-	// wg is used to enforce Close() to return after the watcher() goroutine has finished.
-	// Otherwise, data race will be possible. [Race Example] in dns_resolver_test we
-	// replace the real lookup functions with mocked ones to facilitate testing.
-	// If Close() doesn't wait for watcher() goroutine finishes, race detector sometimes
-	// will warns lookup (READ the lookup function pointers) inside watcher() goroutine
-	// has data race with replaceNetFunc (WRITE the lookup function pointers).
+	// wg is used to enforce Close() to return after the watcher() goroutine has
+	// finished. Otherwise, data race will be possible. [Race Example] in
+	// dns_resolver_test we replace the real lookup functions with mocked ones to
+	// facilitate testing. If Close() doesn't wait for watcher() goroutine
+	// finishes, race detector sometimes will warns lookup (READ the lookup
+	// function pointers) inside watcher() goroutine has data race with
+	// replaceNetFunc (WRITE the lookup function pointers).
 	wg                   sync.WaitGroup
 	disableServiceConfig bool
 }
 
-// ResolveNow invoke an immediate resolution of the target that this dnsResolver watches.
+// ResolveNow invoke an immediate resolution of the target that this
+// dnsResolver watches.
 func (d *dnsResolver) ResolveNow(resolver.ResolveNowOptions) {
 	select {
 	case d.rn <- struct{}{}:
@@ -220,8 +225,8 @@ func (d *dnsResolver) watcher() {
 
 		var timer *time.Timer
 		if err == nil {
-			// Success resolving, wait for the next ResolveNow. However, also wait 30 seconds at the very least
-			// to prevent constantly re-resolving.
+			// Success resolving, wait for the next ResolveNow. However, also wait 30
+			// seconds at the very least to prevent constantly re-resolving.
 			backoffIndex = 1
 			timer = newTimerDNSResRate(minDNSResRate)
 			select {
@@ -231,7 +236,8 @@ func (d *dnsResolver) watcher() {
 			case <-d.rn:
 			}
 		} else {
-			// Poll on an error found in DNS Resolver or an error received from ClientConn.
+			// Poll on an error found in DNS Resolver or an error received from
+			// ClientConn.
 			timer = newTimer(backoff.DefaultExponential.Backoff(backoffIndex))
 			backoffIndex++
 		}
@@ -278,7 +284,8 @@ func (d *dnsResolver) lookupSRV() ([]resolver.Address, error) {
 }
 
 func handleDNSError(err error, lookupType string) error {
-	if dnsErr, ok := err.(*net.DNSError); ok && !dnsErr.IsTimeout && !dnsErr.IsTemporary {
+	dnsErr, ok := err.(*net.DNSError)
+	if ok && !dnsErr.IsTimeout && !dnsErr.IsTemporary {
 		// Timeouts and temporary errors should be communicated to gRPC to
 		// attempt another DNS query (with backoff).  Other errors should be
 		// suppressed (they may represent the absence of a TXT record).
@@ -307,10 +314,12 @@ func (d *dnsResolver) lookupTXT() *serviceconfig.ParseResult {
 		res += s
 	}
 
-	// TXT record must have "grpc_config=" attribute in order to be used as service config.
+	// TXT record must have "grpc_config=" attribute in order to be used as
+	// service config.
 	if !strings.HasPrefix(res, txtAttribute) {
 		logger.Warningf("dns: TXT record %v missing %v attribute", res, txtAttribute)
-		// This is not an error; it is the equivalent of not having a service config.
+		// This is not an error; it is the equivalent of not having a service
+		// config.
 		return nil
 	}
 	sc := canaryingSC(strings.TrimPrefix(res, txtAttribute))
@@ -352,9 +361,10 @@ func (d *dnsResolver) lookup() (*resolver.State, error) {
 	return &state, nil
 }
 
-// formatIP returns ok = false if addr is not a valid textual representation of an IP address.
-// If addr is an IPv4 address, return the addr and ok = true.
-// If addr is an IPv6 address, return the addr enclosed in square brackets and ok = true.
+// formatIP returns ok = false if addr is not a valid textual representation of
+// an IP address. If addr is an IPv4 address, return the addr and ok = true.
+// If addr is an IPv6 address, return the addr enclosed in square brackets and
+// ok = true.
 func formatIP(addr string) (addrIP string, ok bool) {
 	ip := net.ParseIP(addr)
 	if ip == nil {
@@ -366,10 +376,10 @@ func formatIP(addr string) (addrIP string, ok bool) {
 	return "[" + addr + "]", true
 }
 
-// parseTarget takes the user input target string and default port, returns formatted host and port info.
-// If target doesn't specify a port, set the port to be the defaultPort.
-// If target is in IPv6 format and host-name is enclosed in square brackets, brackets
-// are stripped when setting the host.
+// parseTarget takes the user input target string and default port, returns
+// formatted host and port info. If target doesn't specify a port, set the port
+// to be the defaultPort. If target is in IPv6 format and host-name is enclosed
+// in square brackets, brackets are stripped when setting the host.
 // examples:
 // target: "www.google.com" defaultPort: "443" returns host: "www.google.com", port: "443"
 // target: "ipv4-host:80" defaultPort: "443" returns host: "ipv4-host", port: "80"
@@ -385,12 +395,14 @@ func parseTarget(target, defaultPort string) (host, port string, err error) {
 	}
 	if host, port, err = net.SplitHostPort(target); err == nil {
 		if port == "" {
-			// If the port field is empty (target ends with colon), e.g. "[::1]:", this is an error.
+			// If the port field is empty (target ends with colon), e.g. "[::1]:",
+			// this is an error.
 			return "", "", errEndsWithColon
 		}
 		// target has port, i.e ipv4-host:port, [ipv6-host]:port, host-name:port
 		if host == "" {
-			// Keep consistent with net.Dial(): If the host is empty, as in ":80", the local system is assumed.
+			// Keep consistent with net.Dial(): If the host is empty, as in ":80",
+			// the local system is assumed.
 			host = "localhost"
 		}
 		return host, port, nil

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

@@ -238,7 +238,7 @@ func NewServerTransport(conn net.Conn, config *ServerConfig) (_ ServerTransport,
 		kp.Timeout = defaultServerKeepaliveTimeout
 	}
 	if kp.Time != infinity {
-		if err = syscall.SetTCPUserTimeout(conn, kp.Timeout); err != nil {
+		if err = syscall.SetTCPUserTimeout(rawConn, kp.Timeout); err != nil {
 			return nil, connectionErrorf(false, err, "transport: failed to set TCP_USER_TIMEOUT: %v", err)
 		}
 	}