fix: limit workers

poller/metric.go

@@ -4,15 +4,15 @@ import "sync/atomic"
 
 // Metric interface
 type Metric interface {
-	IncBusyWorker() uint64
-	DecBusyWorker() uint64
-	BusyWorkers() uint64
+	IncBusyWorker() int64
+	DecBusyWorker() int64
+	BusyWorkers() int64
 }
 
 var _ Metric = (*metric)(nil)
 
 type metric struct {
-	busyWorkers uint64
+	busyWorkers int64
 }
 
 // NewMetric for default metric structure
@@ -20,14 +20,14 @@ func NewMetric() Metric {
 	return &metric{}
 }
 
-func (m *metric) IncBusyWorker() uint64 {
-	return atomic.AddUint64(&m.busyWorkers, 1)
+func (m *metric) IncBusyWorker() int64 {
+	return atomic.AddInt64(&m.busyWorkers, 1)
 }
 
-func (m *metric) DecBusyWorker() uint64 {
-	return atomic.AddUint64(&m.busyWorkers, ^uint64(0))
+func (m *metric) DecBusyWorker() int64 {
+	return atomic.AddInt64(&m.busyWorkers, -1)
 }
 
-func (m *metric) BusyWorkers() uint64 {
-	return atomic.LoadUint64(&m.busyWorkers)
+func (m *metric) BusyWorkers() int64 {
+	return atomic.LoadInt64(&m.busyWorkers)
 }