[release-17.0] CI: Address data races on memorytopo Conn.closed (#15365)

go/vt/topo/memorytopo/election.go

@@ -26,7 +26,7 @@ import (
 
 // NewLeaderParticipation is part of the topo.Server interface
 func (c *Conn) NewLeaderParticipation(name, id string) (topo.LeaderParticipation, error) {
-	if c.closed {
+	if c.closed.Load() {
 		return nil, ErrConnectionClosed
 	}
 
@@ -72,7 +72,7 @@ type cLeaderParticipation struct {
 
 // WaitForLeadership is part of the topo.LeaderParticipation interface.
 func (mp *cLeaderParticipation) WaitForLeadership() (context.Context, error) {
-	if mp.c.closed {
+	if mp.c.closed.Load() {
 		return nil, ErrConnectionClosed
 	}
 
@@ -120,7 +120,7 @@ func (mp *cLeaderParticipation) Stop() {
 
 // GetCurrentLeaderID is part of the topo.LeaderParticipation interface
 func (mp *cLeaderParticipation) GetCurrentLeaderID(ctx context.Context) (string, error) {
-	if mp.c.closed {
+	if mp.c.closed.Load() {
 		return "", ErrConnectionClosed
 	}
 
@@ -139,7 +139,7 @@ func (mp *cLeaderParticipation) GetCurrentLeaderID(ctx context.Context) (string,
 
 // WaitForNewLeader is part of the topo.LeaderParticipation interface
 func (mp *cLeaderParticipation) WaitForNewLeader(ctx context.Context) (<-chan string, error) {
-	if mp.c.closed {
+	if mp.c.closed.Load() {
 		return nil, ErrConnectionClosed
 	}
 

go/vt/topo/memorytopo/lock.go

@@ -112,7 +112,7 @@ func (ld *memoryTopoLockDescriptor) Unlock(ctx context.Context) error {
 }
 
 func (c *Conn) unlock(ctx context.Context, dirPath string) error {
-	if c.closed {
+	if c.closed.Load() {
 		return ErrConnectionClosed
 	}
 

go/vt/topo/memorytopo/memorytopo.go

@@ -25,6 +25,7 @@ import (
 	"math/rand"
 	"strings"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"vitess.io/vitess/go/vt/log"
@@ -124,14 +125,14 @@ type Conn struct {
 	factory    *Factory
 	cell       string
 	serverAddr string
-	closed     bool
+	closed     atomic.Bool
 }
 
 // dial returns immediately, unless the Conn points to the sentinel
 // UnreachableServerAddr, in which case it will block until the context expires
 // and return the context's error.
 func (c *Conn) dial(ctx context.Context) error {
-	if c.closed {
+	if c.closed.Load() {
 		return ErrConnectionClosed
 	}
 	if c.serverAddr == UnreachableServerAddr {
@@ -144,7 +145,7 @@ func (c *Conn) dial(ctx context.Context) error {
 
 // Close is part of the topo.Conn interface.
 func (c *Conn) Close() {
-	c.closed = true
+	c.closed.Store(true)
 }
 
 type watch struct {

go/vt/topo/memorytopo/watch.go

@@ -25,7 +25,7 @@ import (
 
 // Watch is part of the topo.Conn interface.
 func (c *Conn) Watch(ctx context.Context, filePath string) (*topo.WatchData, <-chan *topo.WatchData, error) {
-	if c.closed {
+	if c.closed.Load() {
 		return nil, nil, ErrConnectionClosed
 	}
 
@@ -75,7 +75,7 @@ func (c *Conn) Watch(ctx context.Context, filePath string) (*topo.WatchData, <-c
 
 // WatchRecursive is part of the topo.Conn interface.
 func (c *Conn) WatchRecursive(ctx context.Context, dirpath string) ([]*topo.WatchDataRecursive, <-chan *topo.WatchDataRecursive, error) {
-	if c.closed {
+	if c.closed.Load() {
 		return nil, nil, ErrConnectionClosed
 	}