configurable for load and stat statistics logs (#980)

core/load/adaptiveshedder.go

@@ -31,6 +31,8 @@ var (
 
 	// default to be enabled
 	enabled = syncx.ForAtomicBool(true)
+	// default to be enabled
+	logEnabled = syncx.ForAtomicBool(true)
 	// make it a variable for unit test
 	systemOverloadChecker = func(cpuThreshold int64) bool {
 		return stat.CpuUsage() >= cpuThreshold
@@ -80,6 +82,11 @@ func Disable() {
 	enabled.Set(false)
 }
 
+// DisableLog disables the stat logs for load shedding.
+func DisableLog() {
+	logEnabled.Set(false)
+}
+
 // NewAdaptiveShedder returns an adaptive shedder.
 // opts can be used to customize the Shedder.
 func NewAdaptiveShedder(opts ...ShedderOption) Shedder {

core/load/adaptiveshedder_test.go

@@ -25,6 +25,7 @@ func init() {
 }
 
 func TestAdaptiveShedder(t *testing.T) {
+	DisableLog()
 	shedder := NewAdaptiveShedder(WithWindow(bucketDuration), WithBuckets(buckets), WithCpuThreshold(100))
 	var wg sync.WaitGroup
 	var drop int64

core/load/sheddingstat.go

@@ -48,6 +48,25 @@ func (s *SheddingStat) IncrementDrop() {
 	atomic.AddInt64(&s.drop, 1)
 }
 
+func (s *SheddingStat) loop(c <-chan time.Time) {
+	for range c {
+		st := s.reset()
+
+		if !logEnabled.True() {
+			continue
+		}
+
+		c := stat.CpuUsage()
+		if st.Drop == 0 {
+			logx.Statf("(%s) shedding_stat [1m], cpu: %d, total: %d, pass: %d, drop: %d",
+				s.name, c, st.Total, st.Pass, st.Drop)
+		} else {
+			logx.Statf("(%s) shedding_stat_drop [1m], cpu: %d, total: %d, pass: %d, drop: %d",
+				s.name, c, st.Total, st.Pass, st.Drop)
+		}
+	}
+}
+
 func (s *SheddingStat) reset() snapshot {
 	return snapshot{
 		Total: atomic.SwapInt64(&s.total, 0),
@@ -59,15 +78,6 @@ func (s *SheddingStat) reset() snapshot {
 func (s *SheddingStat) run() {
 	ticker := time.NewTicker(time.Minute)
 	defer ticker.Stop()
-	for range ticker.C {
-		c := stat.CpuUsage()
-		st := s.reset()
-		if st.Drop == 0 {
-			logx.Statf("(%s) shedding_stat [1m], cpu: %d, total: %d, pass: %d, drop: %d",
-				s.name, c, st.Total, st.Pass, st.Drop)
-		} else {
-			logx.Statf("(%s) shedding_stat_drop [1m], cpu: %d, total: %d, pass: %d, drop: %d",
-				s.name, c, st.Total, st.Pass, st.Drop)
-		}
-	}
+
+	s.loop(ticker.C)
 }

core/load/sheddingstat_test.go

@@ -2,6 +2,7 @@ package load
 
 import (
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/assert"
 )
@@ -22,3 +23,32 @@ func TestSheddingStat(t *testing.T) {
 	assert.Equal(t, int64(5), result.Pass)
 	assert.Equal(t, int64(7), result.Drop)
 }
+
+func TestLoopTrue(t *testing.T) {
+	ch := make(chan time.Time, 1)
+	ch <- time.Now()
+	close(ch)
+	st := new(SheddingStat)
+	logEnabled.Set(true)
+	st.loop(ch)
+}
+
+func TestLoopTrueAndDrop(t *testing.T) {
+	ch := make(chan time.Time, 1)
+	ch <- time.Now()
+	close(ch)
+	st := new(SheddingStat)
+	st.IncrementDrop()
+	logEnabled.Set(true)
+	st.loop(ch)
+}
+
+func TestLoopFalseAndDrop(t *testing.T) {
+	ch := make(chan time.Time, 1)
+	ch <- time.Now()
+	close(ch)
+	st := new(SheddingStat)
+	st.IncrementDrop()
+	logEnabled.Set(false)
+	st.loop(ch)
+}

core/stat/usage.go

@@ -38,7 +38,9 @@ func init() {
 					atomic.StoreInt64(&cpuUsage, usage)
 				})
 			case <-allTicker.C:
-				printUsage()
+				if logEnabled.True() {
+					printUsage()
+				}
 			}
 		}
 	}()