Remove grpcsync.OnceFunc as OnceFunc is part of standard sync lib starting go1.22

Author: ashishksrivastava

balancer_wrapper.go

@@ -415,7 +415,7 @@ func (acbw *acBalancerWrapper) GetOrBuildProducer(pb balancer.ProducerBuilder) (
 		}
 		acbw.producersMu.Unlock()
 	}
-	return pData.producer, grpcsync.OnceFunc(unref)
+	return pData.producer, sync.OnceFunc(unref)
 }
 
 func (acbw *acBalancerWrapper) closeProducers() {

internal/grpcsync/oncefunc.go

@@ -27,11 +27,11 @@ import (
 	"errors"
 	"fmt"
 	"net"
+	"sync"
 
 	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/credentials/tls/certprovider"
 	"google.golang.org/grpc/credentials/tls/certprovider/pemfile"
-	"google.golang.org/grpc/internal/grpcsync"
 )
 
 // bundle is an implementation of credentials.Bundle which implements mTLS
@@ -81,7 +81,7 @@ func NewBundle(jd json.RawMessage) (credentials.Bundle, func(), error) {
 	}
 	return &bundle{
 		transportCredentials: &reloadingCreds{provider: provider},
-	}, grpcsync.OnceFunc(func() { provider.Close() }), nil
+	}, sync.OnceFunc(func() { provider.Close() }), nil
 }
 
 func (t *bundle) TransportCredentials() credentials.TransportCredentials {

internal/grpcsync/oncefunc_test.go

@@ -25,7 +25,6 @@ import (
 	"google.golang.org/grpc/balancer"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/internal/backoff"
-	"google.golang.org/grpc/internal/grpcsync"
 	"google.golang.org/grpc/orca/internal"
 	"google.golang.org/grpc/status"
 
@@ -85,7 +84,7 @@ func RegisterOOBListener(sc balancer.SubConn, l OOBListener, opts OOBListenerOpt
 
 	// If stop is called multiple times, prevent it from having any effect on
 	// subsequent calls.
-	return grpcsync.OnceFunc(func() {
+	return sync.OnceFunc(func() {
 		p.unregisterListener(l, opts.ReportInterval)
 		closeFn()
 	})

internal/xds/bootstrap/tlscreds/bundle.go

@@ -643,7 +643,7 @@ func (s *Server) serverWorker() {
 // connections to reduce the time spent overall on runtime.morestack.
 func (s *Server) initServerWorkers() {
 	s.serverWorkerChannel = make(chan func())
-	s.serverWorkerChannelClose = grpcsync.OnceFunc(func() {
+	s.serverWorkerChannelClose = sync.OnceFunc(func() {
 		close(s.serverWorkerChannel)
 	})
 	for i := uint32(0); i < s.opts.numServerWorkers; i++ {
@@ -1930,7 +1930,7 @@ func (s *Server) stop(graceful bool) {
 	s.conns = nil
 
 	if s.opts.numServerWorkers > 0 {
-		// Closing the channel (only once, via grpcsync.OnceFunc) after all the
+		// Closing the channel (only once, via sync.OnceFunc) after all the
 		// connections have been closed above ensures that there are no
 		// goroutines executing the callback passed to st.HandleStreams (where
 		// the channel is written to).

orca/producer.go

@@ -23,6 +23,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"strings"
+	"sync"
 	"testing"
 	"time"
 
@@ -32,7 +33,6 @@ import (
 	"github.com/google/uuid"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/internal"
-	"google.golang.org/grpc/internal/grpcsync"
 	iresolver "google.golang.org/grpc/internal/resolver"
 	"google.golang.org/grpc/internal/testutils"
 	"google.golang.org/grpc/internal/testutils/xds/e2e"
@@ -271,7 +271,7 @@ func (s) TestResolverCloseClosesXDSClient(t *testing.T) {
 			Name:               t.Name(),
 			WatchExpiryTimeout: defaultTestTimeout,
 		})
-		return c, grpcsync.OnceFunc(func() {
+		return c, sync.OnceFunc(func() {
 			close(closeCh)
 			cancel()
 		}), err

server.go

@@ -20,6 +20,7 @@ package xdsclient
 import (
 	"context"
 	"fmt"
+	"sync"
 	"sync/atomic"
 
 	"google.golang.org/grpc/grpclog"
@@ -674,7 +675,7 @@ func (a *authority) watchResource(rType xdsresource.Type, resourceName string, w
 }
 
 func (a *authority) unwatchResource(rType xdsresource.Type, resourceName string, watcher xdsresource.ResourceWatcher) func() {
-	return grpcsync.OnceFunc(func() {
+	return sync.OnceFunc(func() {
 		done := make(chan struct{})
 		a.xdsClientSerializer.ScheduleOr(func(context.Context) {
 			defer close(done)

xds/internal/resolver/xds_resolver_test.go

@@ -342,7 +342,7 @@ func (c *clientImpl) getOrCreateChannel(serverConfig *bootstrap.ServerConfig, in
 // reference to the xdsChannel. This returned function is idempotent, meaning
 // it can be called multiple times without any additional effect.
 func (c *clientImpl) releaseChannel(serverConfig *bootstrap.ServerConfig, state *channelState, deInitLocked func(*channelState)) func() {
-	return grpcsync.OnceFunc(func() {
+	return sync.OnceFunc(func() {
 		c.channelsMu.Lock()
 
 		if c.logger.V(2) {

xds/internal/xdsclient/authority.go

@@ -25,7 +25,6 @@ import (
 
 	v3statuspb "github.com/envoyproxy/go-control-plane/envoy/service/status/v3"
 	"google.golang.org/grpc/internal/backoff"
-	"google.golang.org/grpc/internal/grpcsync"
 	"google.golang.org/grpc/internal/xds/bootstrap"
 )
 
@@ -131,7 +130,7 @@ func (p *Pool) GetClientForTesting(name string) (XDSClient, func(), error) {
 		return nil, nil, fmt.Errorf("xds:: xDS client with name %q not found", name)
 	}
 	c.incrRef()
-	return c, grpcsync.OnceFunc(func() { p.clientRefCountedClose(name) }), nil
+	return c, sync.OnceFunc(func() { p.clientRefCountedClose(name) }), nil
 }
 
 // SetFallbackBootstrapConfig is used to specify a bootstrap configuration
@@ -193,7 +192,7 @@ func (p *Pool) newRefCounted(name string, watchExpiryTimeout time.Duration, stre
 
 	if c := p.clients[name]; c != nil {
 		c.incrRef()
-		return c, grpcsync.OnceFunc(func() { p.clientRefCountedClose(name) }), nil
+		return c, sync.OnceFunc(func() { p.clientRefCountedClose(name) }), nil
 	}
 
 	c, err := newClientImpl(p.config, watchExpiryTimeout, streamBackoff)
@@ -208,5 +207,5 @@ func (p *Pool) newRefCounted(name string, watchExpiryTimeout time.Duration, stre
 	xdsClientImplCreateHook(name)
 
 	logger.Infof("xDS node ID: %s", p.config.Node().GetId())
-	return client, grpcsync.OnceFunc(func() { p.clientRefCountedClose(name) }), nil
+	return client, sync.OnceFunc(func() { p.clientRefCountedClose(name) }), nil
 }

xds/internal/xdsclient/clientimpl.go

@@ -29,7 +29,6 @@ import (
 	"google.golang.org/grpc/grpclog"
 	"google.golang.org/grpc/internal/backoff"
 	igrpclog "google.golang.org/grpc/internal/grpclog"
-	"google.golang.org/grpc/internal/grpcsync"
 	"google.golang.org/grpc/internal/pretty"
 	"google.golang.org/grpc/xds/internal"
 	"google.golang.org/grpc/xds/internal/xdsclient/load"
@@ -107,7 +106,7 @@ func (lrs *StreamImpl) ReportLoad() (*load.Store, func()) {
 	lrs.mu.Lock()
 	defer lrs.mu.Unlock()
 
-	cleanup := grpcsync.OnceFunc(func() {
+	cleanup := sync.OnceFunc(func() {
 		lrs.mu.Lock()
 		defer lrs.mu.Unlock()