partially fix race cond

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

counter.go

@@ -11,55 +11,57 @@ import (
 type prometheusCounter struct {
 	name string
 	c    *dto.Metric
+	n    float64
 }
 
 func (c *prometheusCounter) Add(n int) {
-	addFloat64(c.c.Gauge.Value, float64(n))
+	addFloat64(&(c.n), float64(n))
 }
 
 func (c *prometheusCounter) Dec() {
-	addFloat64(c.c.Gauge.Value, float64(-1))
+	addFloat64(&(c.n), float64(-1))
 }
 
 func (c *prometheusCounter) Inc() {
-	addFloat64(c.c.Gauge.Value, float64(1))
+	addFloat64(&(c.n), float64(1))
 }
 
 func (c *prometheusCounter) Get() uint64 {
-	return uint64(getFloat64(c.c.Gauge.Value))
+	return uint64(getFloat64(&(c.n)))
 }
 
 func (c *prometheusCounter) Set(n uint64) {
-	setFloat64(c.c.Gauge.Value, math.Float64frombits(n))
+	setFloat64(&(c.n), math.Float64frombits(n))
 }
 
 type prometheusFloatCounter struct {
 	name string
 	c    *dto.Metric
+	n    float64
 }
 
 func (c *prometheusFloatCounter) Add(n float64) {
-	addFloat64(c.c.Gauge.Value, n)
+	addFloat64(&(c.n), n)
 }
 
 func (c *prometheusFloatCounter) Dec() {
-	addFloat64(c.c.Gauge.Value, float64(-1))
+	addFloat64(&(c.n), float64(-1))
 }
 
 func (c *prometheusFloatCounter) Inc() {
-	addFloat64(c.c.Gauge.Value, float64(1))
+	addFloat64(&(c.n), float64(1))
 }
 
 func (c *prometheusFloatCounter) Get() float64 {
-	return getFloat64(c.c.Gauge.Value)
+	return getFloat64(&(c.n))
 }
 
 func (c *prometheusFloatCounter) Set(n float64) {
-	setFloat64(c.c.Gauge.Value, n)
+	setFloat64(&(c.n), n)
 }
 
 func (c *prometheusFloatCounter) Sub(n float64) {
-	addFloat64(c.c.Gauge.Value, -n)
+	addFloat64(&(c.n), -n)
 }
 
 func setFloat64(_addr *float64, value float64) float64 {

gauge.go

@@ -5,8 +5,9 @@ import dto "github.com/prometheus/client_model/go"
 type prometheusGauge struct {
 	name string
 	c    *dto.Metric
+	n    float64
 }
 
-func (c prometheusGauge) Get() float64 {
-	return getFloat64(c.c.Gauge.Value)
+func (c *prometheusGauge) Get() float64 {
+	return getFloat64(&(c.n))
 }

prometheus.go

@@ -5,6 +5,7 @@ import (
 	"io"
 	"regexp"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"github.com/prometheus/client_golang/prometheus"
@@ -53,82 +54,83 @@ func (m *prometheusMeter) Counter(name string, labels ...string) meter.Counter {
 	clabels := meter.BuildLabels(append(m.opts.Labels, labels...)...)
 	h := newHash(name, clabels)
 	m.mu.Lock()
-	mc, ok := m.counter[h]
+	c, ok := m.counter[h]
+	// fmt.Printf("counter name %s hash %v labels %v\n", name, h, labels)
 	m.mu.Unlock()
 	if !ok {
-		var v float64
-		mc = &prometheusCounter{
+		var n float64
+		c = &prometheusCounter{
 			name: name,
 			c: &dto.Metric{
-				Gauge: &dto.Gauge{Value: &v},
+				Gauge: &dto.Gauge{Value: &n},
 				Label: labelMetric(clabels),
 			},
 		}
 		m.mu.Lock()
-		m.counter[h] = mc
+		m.counter[h] = c
 		m.mu.Unlock()
 	}
-	return mc
+	return c
 }
 
 func (m *prometheusMeter) FloatCounter(name string, labels ...string) meter.FloatCounter {
 	clabels := meter.BuildLabels(append(m.opts.Labels, labels...)...)
 	h := newHash(name, clabels)
 	m.mu.Lock()
-	mc, ok := m.floatCounter[h]
+	c, ok := m.floatCounter[h]
 	m.mu.Unlock()
 	if !ok {
-		var v float64
-		mc = &prometheusFloatCounter{
+		var n float64
+		c = &prometheusFloatCounter{
 			name: name,
 			c: &dto.Metric{
-				Gauge: &dto.Gauge{Value: &v},
+				Gauge: &dto.Gauge{Value: &n},
 				Label: labelMetric(clabels),
 			},
 		}
 		m.mu.Lock()
-		m.floatCounter[h] = mc
+		m.floatCounter[h] = c
 		m.mu.Unlock()
 	}
-	return mc
+	return c
 }
 
 func (m *prometheusMeter) Gauge(name string, fn func() float64, labels ...string) meter.Gauge {
 	clabels := meter.BuildLabels(append(m.opts.Labels, labels...)...)
 	h := newHash(name, clabels)
 	m.mu.Lock()
-	mc, ok := m.gauge[h]
+	c, ok := m.gauge[h]
 	m.mu.Unlock()
 	if !ok {
-		var v float64
-		mc = &prometheusGauge{
+		var n float64
+		c = &prometheusGauge{
 			name: name,
 			c: &dto.Metric{
-				Gauge: &dto.Gauge{Value: &v},
+				Gauge: &dto.Gauge{Value: &n},
 				Label: labelMetric(clabels),
 			},
 		}
 		m.mu.Lock()
-		m.gauge[h] = mc
+		m.gauge[h] = c
 		m.mu.Unlock()
 	}
-	return mc
+	return c
 }
 
 func (m *prometheusMeter) Histogram(name string, labels ...string) meter.Histogram {
 	clabels := meter.BuildLabels(append(m.opts.Labels, labels...)...)
 	h := newHash(name, clabels)
 	m.mu.Lock()
-	mc, ok := m.histogram[h]
+	c, ok := m.histogram[h]
 	m.mu.Unlock()
 	if !ok {
-		var c uint64
+		var n uint64
 		var s float64
 		buckets := make([]float64, len(prometheus.DefBuckets))
 		copy(buckets, prometheus.DefBuckets)
 		mdto := &dto.Metric{
 			Histogram: &dto.Histogram{
-				SampleCount:      &c,
+				SampleCount:      &n,
 				SampleSum:        &s,
 				CreatedTimestamp: timestamppb.Now(),
 				Bucket:           make([]*dto.Bucket, len(buckets)),
@@ -139,31 +141,31 @@ func (m *prometheusMeter) Histogram(name string, labels ...string) meter.Histogr
 			var cc uint64
 			mdto.Histogram.Bucket[idx] = &dto.Bucket{CumulativeCount: &cc, UpperBound: &b}
 		}
-		mc = &prometheusHistogram{
+		c = &prometheusHistogram{
 			name: name,
 			c:    mdto,
 		}
 		m.mu.Lock()
-		m.histogram[h] = mc
+		m.histogram[h] = c
 		m.mu.Unlock()
 	}
-	return mc
+	return c
 }
 
 func (m *prometheusMeter) Summary(name string, labels ...string) meter.Summary {
 	clabels := meter.BuildLabels(append(m.opts.Labels, labels...)...)
 	h := newHash(name, clabels)
 	m.mu.Lock()
-	mc, ok := m.summary[h]
+	c, ok := m.summary[h]
 	m.mu.Unlock()
 	if !ok {
-		var c uint64
+		var n uint64
 		var s float64
-		mc = &prometheusSummary{
+		c = &prometheusSummary{
 			name: name,
 			c: &dto.Metric{
 				Summary: &dto.Summary{
-					SampleCount:      &c,
+					SampleCount:      &n,
 					SampleSum:        &s,
 					CreatedTimestamp: timestamppb.Now(),
 				},
@@ -171,36 +173,36 @@ func (m *prometheusMeter) Summary(name string, labels ...string) meter.Summary {
 			},
 		}
 		m.mu.Lock()
-		m.summary[h] = mc
+		m.summary[h] = c
 		m.mu.Unlock()
 	}
-	return mc
+	return c
 }
 
 func (m *prometheusMeter) SummaryExt(name string, window time.Duration, quantiles []float64, labels ...string) meter.Summary {
 	clabels := meter.BuildLabels(append(m.opts.Labels, labels...)...)
 	h := newHash(name, clabels)
 	m.mu.Lock()
-	mc, ok := m.summary[h]
+	c, ok := m.summary[h]
 	m.mu.Lock()
 	if !ok {
-		var c uint64
+		var n uint64
 		var s float64
-		mc = &prometheusSummary{
+		c = &prometheusSummary{
 			name: name,
 			c: &dto.Metric{
 				Summary: &dto.Summary{
-					SampleCount: &c,
+					SampleCount: &n,
 					SampleSum:   &s,
 				},
 				Label: labelMetric(clabels),
 			},
 		}
 		m.mu.Lock()
-		m.summary[h] = mc
+		m.summary[h] = c
 		m.mu.Unlock()
 	}
-	return mc
+	return c
 }
 
 func (m *prometheusMeter) Init(opts ...meter.Option) error {
@@ -238,27 +240,33 @@ func (m *prometheusMeter) Write(w io.Writer, opts ...meter.Option) error {
 
 	m.mu.Lock()
 
-	for _, c := range m.counter {
+	for _, mc := range m.counter {
 		mf := m.mfPool.Get()
-		mf.Name = &c.name
+		mf.Name = &mc.name
 		mf.Type = dto.MetricType_GAUGE.Enum()
-		mf.Metric = append(mf.Metric, c.c)
+		n := getFloat64(&(mc.n))
+		mc.c.Gauge.Value = &n
+		mf.Metric = append(mf.Metric, mc.c)
 		mfs = append(mfs, mf)
 	}
 
-	for _, c := range m.floatCounter {
+	for _, mc := range m.floatCounter {
 		mf := m.mfPool.Get()
-		mf.Name = &c.name
+		mf.Name = &mc.name
 		mf.Type = dto.MetricType_GAUGE.Enum()
-		mf.Metric = append(mf.Metric, c.c)
+		n := getFloat64(&(mc.n))
+		mc.c.Gauge.Value = &n
+		mf.Metric = append(mf.Metric, mc.c)
 		mfs = append(mfs, mf)
 	}
 
-	for _, c := range m.gauge {
+	for _, mc := range m.gauge {
 		mf := m.mfPool.Get()
-		mf.Name = &c.name
+		mf.Name = &mc.name
 		mf.Type = dto.MetricType_GAUGE.Enum()
-		mf.Metric = append(mf.Metric, c.c)
+		n := getFloat64(&(mc.n))
+		mc.c.Gauge.Value = &n
+		mf.Metric = append(mf.Metric, mc.c)
 		mfs = append(mfs, mf)
 	}
 
@@ -270,11 +278,15 @@ func (m *prometheusMeter) Write(w io.Writer, opts ...meter.Option) error {
 		mfs = append(mfs, mf)
 	}
 
-	for _, c := range m.summary {
+	for _, mc := range m.summary {
 		mf := m.mfPool.Get()
-		mf.Name = &c.name
+		mf.Name = &mc.name
 		mf.Type = dto.MetricType_SUMMARY.Enum()
-		mf.Metric = append(mf.Metric, c.c)
+		sc := atomic.LoadUint64(&(mc.sampleCount))
+		mc.c.Summary.SampleCount = &sc
+		ss := getFloat64(&(mc.SampleSum))
+		mc.c.Summary.SampleSum = &ss
+		mf.Metric = append(mf.Metric, mc.c)
 		mfs = append(mfs, mf)
 	}
 

prometheus_test.go

@@ -15,11 +15,25 @@ import (
 )
 
 func TestHash(t *testing.T) {
-	t.Skip()
-	h1 := newHash("micro_server_request_total", []string{"code", "16", "endpoint", "/clientprofile.ClientProfileService/GetClientProfile", "status", "failure"})
-	h2 := newHash("micro_server_request_total", []string{"code", "16", "endpoint", "/clientproduct.ClientProductService/GetDepositProducts", "status", "failure"})
-	h3 := newHash("micro_server_request_total", []string{"code", "16", "endpoint", "/operationsinfo.OperationsInfoService/GetOperations", "status", "failure"})
-	t.Logf("h1: %v\nh2: %v\nh3: %v\n", h1, h2, h3)
+	m := NewMeter() // meter.Labels("test_key", "test_val"))
+
+	buf := bytes.NewBuffer(nil)
+
+	for i := 0; i < 100000; i++ {
+		go func() {
+			m.Counter("micro_server_request_total", "code", "16",
+				"endpoint", "/clientprofile.ClientProfileService/GetClientProfile",
+				"status", "failure").Inc()
+			m.Counter("micro_server_request_total", "code", "16",
+				"endpoint", "/clientproduct.ClientProductService/GetDepositProducts",
+				"status", "failure").Inc()
+			m.Counter("micro_server_request_total", "code", "16",
+				"endpoint", "/operationsinfo.OperationsInfoService/GetOperations",
+				"status", "failure").Inc()
+		}()
+	}
+	_ = m.Write(buf)
+	t.Logf("h1: %s\n", buf.Bytes())
 }
 
 func TestHistogram(t *testing.T) {

summary.go

@@ -10,15 +10,17 @@ import (
 type prometheusSummary struct {
 	name        string
 	c           *dto.Metric
+	sampleCount uint64
+	SampleSum   float64
 }
 
-func (c prometheusSummary) Update(n float64) {
-	atomic.AddUint64(c.c.Summary.SampleCount, 1)
-	addFloat64(c.c.Summary.SampleSum, n)
+func (c *prometheusSummary) Update(n float64) {
+	atomic.AddUint64(&(c.sampleCount), 1)
+	addFloat64(&(c.SampleSum), n)
 }
 
-func (c prometheusSummary) UpdateDuration(n time.Time) {
-	x := time.Since(n).Seconds()
-	atomic.AddUint64(c.c.Summary.SampleCount, 1)
-	addFloat64(c.c.Summary.SampleSum, x)
+func (c *prometheusSummary) UpdateDuration(t time.Time) {
+	n := time.Since(t).Seconds()
+	atomic.AddUint64(&(c.sampleCount), 1)
+	addFloat64(&(c.SampleSum), n)
 }