fix data race

internal/metrics/period/poller.go

@@ -12,6 +12,7 @@ import (
 	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/logging"
 	"github.com/yusing/go-proxy/internal/task"
+	"github.com/yusing/go-proxy/internal/utils/atomic"
 )
 
 type (
@@ -24,7 +25,7 @@ type (
 		aggregate    AggregateFunc[T, AggregateT]
 		resultFilter FilterFunc[T]
 		period       *Period[T]
-		lastResult   *T
+		lastResult   atomic.Value[*T]
 		errs         []pollErr
 	}
 	pollErr struct {
@@ -119,13 +120,13 @@ func (p *Poller[T, AggregateT]) clearErrs() {
 func (p *Poller[T, AggregateT]) pollWithTimeout(ctx context.Context) {
 	ctx, cancel := context.WithTimeout(ctx, pollInterval)
 	defer cancel()
-	data, err := p.poll(ctx, p.lastResult)
+	data, err := p.poll(ctx, p.lastResult.Load())
 	if err != nil {
 		p.appendErr(err)
 		return
 	}
 	p.period.Add(data)
-	p.lastResult = data
+	p.lastResult.Store(data)
 }
 
 func (p *Poller[T, AggregateT]) Start() {
@@ -184,5 +185,5 @@ func (p *Poller[T, AggregateT]) Get(filter Filter) ([]*T, bool) {
 }
 
 func (p *Poller[T, AggregateT]) GetLastResult() *T {
-	return p.lastResult
+	return p.lastResult.Load()
 }

internal/metrics/uptime/uptime.go

@@ -31,10 +31,6 @@ type (
 
 var Poller = period.NewPoller("uptime", getStatuses, aggregateStatuses)
 
-func init() {
-	Poller.Start()
-}
-
 func getStatuses(ctx context.Context, _ *StatusByAlias) (*StatusByAlias, error) {
 	return &StatusByAlias{
 		Map:       routequery.HealthInfo(),

internal/route/route.go

@@ -125,6 +125,7 @@ func (r *Route) Start(parent task.Parent) (err gperr.Error) {
 	if r.impl == nil {
 		return gperr.New("route not initialized")
 	}
+
 	return r.impl.Start(parent)
 }
 
@@ -337,7 +338,7 @@ func (r *Route) Finalize() {
 	r.Port.Listening, r.Port.Proxy = lp, pp
 
 	if r.HealthCheck == nil {
-		r.HealthCheck = health.DefaultHealthConfig
+		r.HealthCheck = health.DefaultHealthConfig()
 	}
 
 	if !r.HealthCheck.Disable {

internal/utils/atomic/atomic_value.go

@@ -10,7 +10,11 @@ type Value[T any] struct {
 }
 
 func (a *Value[T]) Load() T {
-	return a.Value.Load().(T)
+	if v := a.Value.Load(); v != nil {
+		return v.(T)
+	}
+	var zero T
+	return zero
 }
 
 func (a *Value[T]) Store(v T) {

internal/watcher/health/config.go

@@ -14,7 +14,9 @@ type HealthCheckConfig struct {
 	Timeout  time.Duration `json:"timeout" validate:"omitempty,min=1s"`
 }
 
-var DefaultHealthConfig = &HealthCheckConfig{
-	Interval: common.HealthCheckIntervalDefault,
-	Timeout:  common.HealthCheckTimeoutDefault,
+func DefaultHealthConfig() *HealthCheckConfig {
+	return &HealthCheckConfig{
+		Interval: common.HealthCheckIntervalDefault,
+		Timeout:  common.HealthCheckTimeoutDefault,
+	}
 }

internal/watcher/health/monitor/monitor.go

@@ -25,7 +25,7 @@ type (
 		url     atomic.Value[*types.URL]
 
 		status     atomic.Value[health.Status]
-		lastResult *health.HealthCheckResult
+		lastResult atomic.Value[*health.HealthCheckResult]
 
 		checkHealth HealthCheckFunc
 		startTime   time.Time
@@ -139,10 +139,11 @@ func (mon *monitor) Uptime() time.Duration {
 
 // Latency implements HealthMonitor.
 func (mon *monitor) Latency() time.Duration {
-	if mon.lastResult == nil {
+	res := mon.lastResult.Load()
+	if res == nil {
 		return 0
 	}
-	return mon.lastResult.Latency
+	return res.Latency
 }
 
 // Name implements HealthMonitor.
@@ -158,7 +159,7 @@ func (mon *monitor) String() string {
 
 // MarshalJSON implements json.Marshaler of HealthMonitor.
 func (mon *monitor) MarshalJSON() ([]byte, error) {
-	res := mon.lastResult
+	res := mon.lastResult.Load()
 	if res == nil {
 		res = &health.HealthCheckResult{
 			Healthy: true,
@@ -190,7 +191,7 @@ func (mon *monitor) checkUpdateHealth() error {
 		return nil
 	}
 
-	mon.lastResult = result
+	mon.lastResult.Store(result)
 	var status health.Status
 	if result.Healthy {
 		status = health.StatusHealthy