[#283] pool: Change batch of atomics to mutex

Signed-off-by: Denis Kirillov <denis@nspcc.ru>

pool/mock_test.go

@@ -21,7 +21,7 @@ import (
 
 type mockClient struct {
 	key ecdsa.PrivateKey
-	*clientStatusMonitor
+	clientStatusMonitor
 
 	errorOnCreateSession bool
 	errorOnEndpointInfo  bool

pool/pool.go

@@ -60,7 +60,6 @@ type clientStatus interface {
 	address() string
 	currentErrorRate() uint32
 	overallErrorRate() uint64
-	resetErrorCounter()
 	latency() time.Duration
 	requests() uint64
 }
@@ -68,18 +67,20 @@ type clientStatus interface {
 type clientStatusMonitor struct {
 	addr           string
 	healthy        *atomic.Bool
-	currentErrorCount *atomic.Uint32
-	overallErrorCount *atomic.Uint64
 	errorThreshold uint32
-	allTime           *atomic.Uint64
-	allRequests       *atomic.Uint64
+
+	mu                sync.RWMutex // protect counters
+	currentErrorCount uint32
+	overallErrorCount uint64
+	allTime           uint64
+	allRequests       uint64
 }
 
 // clientWrapper is used by default, alternative implementations are intended for testing purposes only.
 type clientWrapper struct {
 	client sdkClient.Client
 	key    ecdsa.PrivateKey
-	*clientStatusMonitor
+	clientStatusMonitor
 }
 
 type wrapperPrm struct {
@@ -112,20 +113,15 @@ func (x *wrapperPrm) setResponseInfoCallback(f func(sdkClient.ResponseMetaInfo)
 
 func newWrapper(prm wrapperPrm) (*clientWrapper, error) {
 	var prmInit sdkClient.PrmInit
-	//prmInit.ResolveNeoFSFailures()
 	prmInit.SetDefaultPrivateKey(prm.key)
 	prmInit.SetResponseInfoCallback(prm.responseInfoCallback)
 
 	res := &clientWrapper{
 		key: prm.key,
-		clientStatusMonitor: &clientStatusMonitor{
+		clientStatusMonitor: clientStatusMonitor{
 			addr:           prm.address,
 			healthy:        atomic.NewBool(true),
-			currentErrorCount: atomic.NewUint32(0),
-			overallErrorCount: atomic.NewUint64(0),
 			errorThreshold: prm.errorThreshold,
-			allTime:           atomic.NewUint64(0),
-			allRequests:       atomic.NewUint64(0),
 		},
 	}
 
@@ -612,41 +608,48 @@ func (c *clientStatusMonitor) address() string {
 }
 
 func (c *clientStatusMonitor) incErrorRate() {
-	c.currentErrorCount.Inc()
-	c.overallErrorCount.Inc()
-	if c.currentErrorCount.Load() >= c.errorThreshold {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	c.currentErrorCount++
+	c.overallErrorCount++
+	if c.currentErrorCount >= c.errorThreshold {
 		c.setHealthy(false)
-		c.resetErrorCounter()
+		c.currentErrorCount = 0
 	}
 }
 
 func (c *clientStatusMonitor) currentErrorRate() uint32 {
-	return c.currentErrorCount.Load()
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+	return c.currentErrorCount
 }
 
 func (c *clientStatusMonitor) overallErrorRate() uint64 {
-	return c.overallErrorCount.Load()
-}
-
-func (c *clientStatusMonitor) resetErrorCounter() {
-	c.currentErrorCount.Store(0)
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+	return c.overallErrorCount
 }
 
 func (c *clientStatusMonitor) latency() time.Duration {
-	allRequests := c.requests()
-	if allRequests == 0 {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+	if c.allRequests == 0 {
 		return 0
 	}
-	return time.Duration(c.allTime.Load() / allRequests)
+	return time.Duration(c.allTime / c.allRequests)
 }
 
 func (c *clientStatusMonitor) requests() uint64 {
-	return c.allRequests.Load()
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+	return c.allRequests
 }
 
 func (c *clientStatusMonitor) incRequests(elapsed time.Duration) {
-	c.allTime.Add(uint64(elapsed))
-	c.allRequests.Inc()
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	c.allTime += uint64(elapsed)
+	c.allRequests++
 }
 
 func (c *clientStatusMonitor) handleError(st apistatus.Status, err error) error {
@@ -1971,7 +1974,7 @@ func (p Pool) Statistic() Statistic {
 	for _, inner := range p.innerPools {
 		inner.lock.RLock()
 		for _, cl := range inner.clients {
-			node := &NodeStatistic{
+			node := NodeStatistic{
 				address:       cl.address(),
 				latency:       cl.latency(),
 				requests:      cl.requests(),

pool/pool_test.go

@@ -508,31 +508,25 @@ func TestWaitPresence(t *testing.T) {
 	})
 }
 
-func newTestStatusMonitor(addr string) *clientStatusMonitor {
-	return &clientStatusMonitor{
+func newTestStatusMonitor(addr string) clientStatusMonitor {
+	return clientStatusMonitor{
 		addr:           addr,
 		healthy:        atomic.NewBool(true),
-		currentErrorCount: atomic.NewUint32(0),
-		overallErrorCount: atomic.NewUint64(0),
 		errorThreshold: 10,
-		allTime:           atomic.NewUint64(0),
-		allRequests:       atomic.NewUint64(0),
 	}
 }
 
 func TestStatusMonitor(t *testing.T) {
 	monitor := newTestStatusMonitor("")
+	monitor.errorThreshold = 3
 
 	count := 10
-	for i := 0; i < 10; i++ {
+	for i := 0; i < count; i++ {
 		monitor.incErrorRate()
-		if i%3 == 0 {
-			monitor.resetErrorCounter()
-		}
 	}
 
 	require.Equal(t, uint64(count), monitor.overallErrorRate())
-	require.Equal(t, uint32(0), monitor.currentErrorRate())
+	require.Equal(t, uint32(1), monitor.currentErrorRate())
 }
 
 func TestHandleError(t *testing.T) {

pool/statistic.go

@@ -8,7 +8,7 @@ import (
 // Statistic is metrics of the pool.
 type Statistic struct {
 	overallErrors uint64
-	nodes         []*NodeStatistic
+	nodes         []NodeStatistic
 }
 
 // OverallErrors returns sum of errors on all connections. It doesn't decrease.
@@ -17,7 +17,7 @@ func (s Statistic) OverallErrors() uint64 {
 }
 
 // Nodes returns list of nodes statistic.
-func (s Statistic) Nodes() []*NodeStatistic {
+func (s Statistic) Nodes() []NodeStatistic {
 	return s.nodes
 }
 
@@ -29,7 +29,7 @@ var ErrUnknownNode = errors.New("unknown node")
 func (s Statistic) Node(address string) (*NodeStatistic, error) {
 	for i := range s.nodes {
 		if s.nodes[i].address == address {
-			return s.nodes[i], nil
+			return &s.nodes[i], nil
 		}
 	}