protect meter by mutex

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

go.mod

@@ -1,8 +1,7 @@
-module go.unistack.org/micro-meter-prometheus/v4
+module go.unistack.org/micro-meter-prometheus/v3
 
 go 1.22.0
 
-toolchain go1.24.0
 
 require (
 	github.com/prometheus/client_golang v1.21.0

prometheus.go

@@ -5,6 +5,7 @@ import (
 	"hash/fnv"
 	"io"
 	"regexp"
+	"strings"
 	"sync"
 	"time"
 
@@ -25,7 +26,7 @@ type prometheusMeter struct {
 	gauge        map[string]*gauges
 	histogram    map[string]*histograms
 	summary      map[string]*summaries
-	sync.Mutex
+	mu           *sync.Mutex
 }
 
 type counters struct {
@@ -60,6 +61,15 @@ func newString(v string) *string {
 	return &nv
 }
 
+func newName(name string) *string {
+	idx := strings.Index(name, "{")
+	if idx <= 0 {
+		return newString(name)
+	}
+
+	return newString(name[:idx])
+}
+
 func NewMeter(opts ...meter.Option) *prometheusMeter {
 	return &prometheusMeter{
 		set:          prometheus.NewRegistry(), // prometheus.DefaultRegisterer,
@@ -69,6 +79,7 @@ func NewMeter(opts ...meter.Option) *prometheusMeter {
 		gauge:        make(map[string]*gauges),
 		histogram:    make(map[string]*histograms),
 		summary:      make(map[string]*summaries),
+		mu:           &sync.Mutex{},
 	}
 }
 
@@ -90,8 +101,8 @@ func (m *prometheusMeter) Name() string {
 }
 
 func (m *prometheusMeter) Counter(name string, labels ...string) meter.Counter {
-	m.Lock()
-	defer m.Unlock()
+	m.mu.Lock()
+	defer m.mu.Unlock()
 	nm := m.buildMetric(name)
 	labels = append(m.opts.Labels, labels...)
 	cd, ok := m.counter[nm]
@@ -113,8 +124,8 @@ func (m *prometheusMeter) Counter(name string, labels ...string) meter.Counter {
 }
 
 func (m *prometheusMeter) FloatCounter(name string, labels ...string) meter.FloatCounter {
-	m.Lock()
-	defer m.Unlock()
+	m.mu.Lock()
+	defer m.mu.Unlock()
 	nm := m.buildMetric(name)
 	labels = append(m.opts.Labels, labels...)
 	cd, ok := m.floatCounter[nm]
@@ -136,8 +147,8 @@ func (m *prometheusMeter) FloatCounter(name string, labels ...string) meter.Floa
 }
 
 func (m *prometheusMeter) Gauge(name string, fn func() float64, labels ...string) meter.Gauge {
-	m.Lock()
-	defer m.Unlock()
+	m.mu.Lock()
+	defer m.mu.Unlock()
 	nm := m.buildMetric(name)
 	labels = append(m.opts.Labels, labels...)
 	cd, ok := m.gauge[nm]
@@ -159,8 +170,8 @@ func (m *prometheusMeter) Gauge(name string, fn func() float64, labels ...string
 }
 
 func (m *prometheusMeter) Histogram(name string, labels ...string) meter.Histogram {
-	m.Lock()
-	defer m.Unlock()
+	m.mu.Lock()
+	defer m.mu.Unlock()
 	nm := m.buildMetric(name)
 	labels = append(m.opts.Labels, labels...)
 	cd, ok := m.histogram[nm]
@@ -182,8 +193,8 @@ func (m *prometheusMeter) Histogram(name string, labels ...string) meter.Histogr
 }
 
 func (m *prometheusMeter) Summary(name string, labels ...string) meter.Summary {
-	m.Lock()
-	defer m.Unlock()
+	m.mu.Lock()
+	defer m.mu.Unlock()
 	nm := m.buildMetric(name)
 	labels = append(m.opts.Labels, labels...)
 	cd, ok := m.summary[nm]
@@ -205,8 +216,8 @@ func (m *prometheusMeter) Summary(name string, labels ...string) meter.Summary {
 }
 
 func (m *prometheusMeter) SummaryExt(name string, window time.Duration, quantiles []float64, labels ...string) meter.Summary {
-	m.Lock()
-	defer m.Unlock()
+	m.mu.Lock()
+	defer m.mu.Unlock()
 	nm := m.buildMetric(name)
 	labels = append(m.opts.Labels, labels...)
 	cd, ok := m.summary[nm]
@@ -267,9 +278,11 @@ func (m *prometheusMeter) Write(w io.Writer, opts ...meter.Option) error {
 
 	enc := expfmt.NewEncoder(w, expfmt.NewFormat(expfmt.TypeTextPlain))
 
+	m.mu.Lock()
+
 	for name, metrics := range m.counter {
 		mf := &dto.MetricFamily{
-			Name:   newString(name),
+			Name:   newName(name),
 			Type:   dto.MetricType_GAUGE.Enum(),
 			Metric: make([]*dto.Metric, 0, len(metrics.cs)),
 		}
@@ -284,7 +297,7 @@ func (m *prometheusMeter) Write(w io.Writer, opts ...meter.Option) error {
 
 	for name, metrics := range m.gauge {
 		mf := &dto.MetricFamily{
-			Name:   newString(name),
+			Name:   newName(name),
 			Type:   dto.MetricType_GAUGE.Enum(),
 			Metric: make([]*dto.Metric, 0, len(metrics.cs)),
 		}
@@ -299,7 +312,7 @@ func (m *prometheusMeter) Write(w io.Writer, opts ...meter.Option) error {
 
 	for name, metrics := range m.floatCounter {
 		mf := &dto.MetricFamily{
-			Name:   newString(name),
+			Name:   newName(name),
 			Type:   dto.MetricType_GAUGE.Enum(),
 			Metric: make([]*dto.Metric, 0, len(metrics.cs)),
 		}
@@ -314,7 +327,7 @@ func (m *prometheusMeter) Write(w io.Writer, opts ...meter.Option) error {
 
 	for name, metrics := range m.histogram {
 		mf := &dto.MetricFamily{
-			Name:   newString(name),
+			Name:   newName(name),
 			Type:   dto.MetricType_HISTOGRAM.Enum(),
 			Metric: make([]*dto.Metric, 0, len(metrics.cs)),
 		}
@@ -329,7 +342,7 @@ func (m *prometheusMeter) Write(w io.Writer, opts ...meter.Option) error {
 
 	for name, metrics := range m.summary {
 		mf := &dto.MetricFamily{
-			Name:   newString(name),
+			Name:   newName(name),
 			Type:   dto.MetricType_SUMMARY.Enum(),
 			Metric: make([]*dto.Metric, 0, len(metrics.cs)),
 		}
@@ -342,6 +355,8 @@ func (m *prometheusMeter) Write(w io.Writer, opts ...meter.Option) error {
 		mfs = append(mfs, mf)
 	}
 
+	m.mu.Unlock()
+
 	for _, mf := range mfs {
 		_ = enc.Encode(mf)
 	}
@@ -360,6 +375,7 @@ func (m *prometheusMeter) Clone(opts ...meter.Option) meter.Meter {
 	}
 
 	return &prometheusMeter{
+		mu:           m.mu,
 		set:          m.set,
 		opts:         options,
 		floatCounter: m.floatCounter,

prometheus_test.go

@@ -8,6 +8,32 @@ import (
 	"go.unistack.org/micro/v3/meter"
 )
 
+func TestBuildMetric(t *testing.T) {
+	m := NewMeter(meter.Labels("service_name", "test", "service_version", "0.0.0.1"))
+	if err := m.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	name := m.buildMetric("micro_server")
+	if name != `micro_server{service_name="test",service_version="0.0.0.1"}` {
+		t.Fatal("invalid name")
+	}
+}
+
+func TestWithDefaultLabels(t *testing.T) {
+	m := NewMeter(meter.Labels("service_name", "test", "service_version", "0.0.0.1"))
+	if err := m.Init(); err != nil {
+		t.Fatal(err)
+	}
+	m.Counter("micro_server", "endpoint", "ep3", "path", "/path3", "status", "success").Inc()
+
+	buf := bytes.NewBuffer(nil)
+	_ = m.Write(buf, meter.WriteProcessMetrics(false), meter.WriteFDMetrics(false))
+	if !bytes.Contains(buf.Bytes(), []byte(`micro_server{service_name="test",service_version="0.0.0.1",endpoint="ep3",path="/path3",status="success"} 1`)) {
+		t.Fatalf("invalid metrics output: %s", buf.Bytes())
+	}
+}
+
 func TestStd(t *testing.T) {
 	m := NewMeter(meter.WriteProcessMetrics(true), meter.WriteFDMetrics(true))
 	if err := m.Init(); err != nil {
@@ -46,7 +72,6 @@ func TestMultiple(t *testing.T) {
 	buf := bytes.NewBuffer(nil)
 	_ = m.Write(buf, meter.WriteProcessMetrics(false), meter.WriteFDMetrics(false))
 	if !bytes.Contains(buf.Bytes(), []byte(`micro_server{endpoint="ep1",path="/path1"} 2`)) {
-		// t.Fatal("XXXX")
 		t.Fatalf("invalid metrics output: %s", buf.Bytes())
 	}
 }
@@ -58,16 +83,12 @@ func TestCounterSet(t *testing.T) {
 
 	m.Counter("forte_accounts_total", "channel_code", "crm").Set(value)
 
-	fmt.Println(uint64(float64(value)))
-
 	buf := bytes.NewBuffer(nil)
 
 	_ = m.Write(buf)
 
 	output := buf.String()
 
-	fmt.Println(output)
-
 	expectedOutput := fmt.Sprintf(`%s{channel_code="crm"} %d`, "forte_accounts_total", value)
 
 	if !bytes.Contains(buf.Bytes(), []byte(expectedOutput)) {