partially fix race cond

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

.github/workflows/autoapprove.yml

@@ -0,0 +1,20 @@
+name: "autoapprove"
+
+on:
+  pull_request_target:
+    types: [assigned, opened, synchronize, reopened]
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  autoapprove:
+    runs-on: ubuntu-latest
+    steps:
+      - name: approve
+        uses: hmarr/auto-approve-action@v3
+        if: github.actor == 'vtolstov' || github.actor == 'dependabot[bot]'
+        id: approve
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/automerge.yml

@@ -0,0 +1,21 @@
+name: "automerge"
+
+on:
+  pull_request_target:
+    types: [assigned, opened, synchronize, reopened]
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  automerge:
+    runs-on: ubuntu-latest
+    if: github.actor == 'vtolstov'
+    steps:
+      - name: merge
+        id: merge
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.TOKEN}}

.github/workflows/build.yml

@@ -3,19 +3,20 @@ on:
  push:
     branches:
     - master
+    - v3
 jobs:
   test:
     name: test
     runs-on: ubuntu-latest
     steps:
     - name: setup
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@v3
       with:
-        go-version: 1.16
+        go-version: 1.17
     - name: checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: cache
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
@@ -31,9 +32,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: lint
-        uses: golangci/golangci-lint-action@v2
+        uses: golangci/golangci-lint-action@v3.4.0
         continue-on-error: true
         with:
           # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.

.github/workflows/codeql-analysis.yml

@@ -43,14 +43,14 @@ jobs:
 
     steps:
     - name: checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: setup
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@v3
       with:
-        go-version: 1.16
+        go-version: 1.17
     # Initializes the CodeQL tools for scanning.
     - name: init
-      uses: github/codeql-action/init@v1
+      uses: github/codeql-action/init@v2
       with:
         languages: ${{ matrix.language }}
         # If you wish to specify custom queries, you can do so here or in a config file.
@@ -61,7 +61,7 @@ jobs:
     # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
     # If this step fails, then you should remove it and run the build manually (see below)
     - name: autobuild
-      uses: github/codeql-action/autobuild@v1
+      uses: github/codeql-action/autobuild@v2
 
     # ℹ️ Command-line programs to run using the OS shell.
     # 📚 https://git.io/JvXDl
@@ -75,4 +75,4 @@ jobs:
     #   make release
 
     - name: analyze
-      uses: github/codeql-action/analyze@v1
+      uses: github/codeql-action/analyze@v2

.github/workflows/dependabot-automerge.yml

@@ -1,4 +1,4 @@
-name: "prautomerge"
+name: "dependabot-automerge"
 
 on:
   pull_request_target:
@@ -9,21 +9,17 @@ permissions:
   contents: write
 
 jobs:
-  dependabot:
+  automerge:
     runs-on: ubuntu-latest
-    if: ${{ github.actor == 'dependabot[bot]' }}
+    if: github.actor == 'dependabot[bot]'
     steps:
       - name: metadata
         id: metadata
-        uses: dependabot/fetch-metadata@v1.1.1
+        uses: dependabot/fetch-metadata@v1.3.6
         with:
           github-token: "${{ secrets.TOKEN }}"
-      - name: approve
-        run: gh pr review --approve "$PR_URL"
-        env:
-          PR_URL: ${{github.event.pull_request.html_url}}
-          GITHUB_TOKEN: ${{secrets.TOKEN}}
       - name: merge
+        id: merge
         if: ${{contains(steps.metadata.outputs.dependency-names, 'go.unistack.org')}}
         run: gh pr merge --auto --merge "$PR_URL"
         env:

.github/workflows/pr.yml

@@ -3,19 +3,20 @@ on:
   pull_request:
     branches:
     - master
+    - v3
 jobs:
   test:
     name: test
     runs-on: ubuntu-latest
     steps:
     - name: setup
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@v3
       with:
-        go-version: 1.16
+        go-version: 1.17
     - name: checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: cache
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
@@ -31,9 +32,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: lint
-        uses: golangci/golangci-lint-action@v2
+        uses: golangci/golangci-lint-action@v3.4.0
         continue-on-error: true
         with:
           # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.

counter.go

@@ -0,0 +1,93 @@
+package prometheus
+
+import (
+	"math"
+	"sync/atomic"
+	"unsafe"
+
+	dto "github.com/prometheus/client_model/go"
+)
+
+type prometheusCounter struct {
+	name string
+	c    *dto.Metric
+	n    float64
+}
+
+func (c *prometheusCounter) Add(n int) {
+	addFloat64(&(c.n), float64(n))
+}
+
+func (c *prometheusCounter) Dec() {
+	addFloat64(&(c.n), float64(-1))
+}
+
+func (c *prometheusCounter) Inc() {
+	addFloat64(&(c.n), float64(1))
+}
+
+func (c *prometheusCounter) Get() uint64 {
+	return uint64(getFloat64(&(c.n)))
+}
+
+func (c *prometheusCounter) Set(n uint64) {
+	setFloat64(&(c.n), math.Float64frombits(n))
+}
+
+type prometheusFloatCounter struct {
+	name string
+	c    *dto.Metric
+	n    float64
+}
+
+func (c *prometheusFloatCounter) Add(n float64) {
+	addFloat64(&(c.n), n)
+}
+
+func (c *prometheusFloatCounter) Dec() {
+	addFloat64(&(c.n), float64(-1))
+}
+
+func (c *prometheusFloatCounter) Inc() {
+	addFloat64(&(c.n), float64(1))
+}
+
+func (c *prometheusFloatCounter) Get() float64 {
+	return getFloat64(&(c.n))
+}
+
+func (c *prometheusFloatCounter) Set(n float64) {
+	setFloat64(&(c.n), n)
+}
+
+func (c *prometheusFloatCounter) Sub(n float64) {
+	addFloat64(&(c.n), -n)
+}
+
+func setFloat64(_addr *float64, value float64) float64 {
+	addr := (*uint64)(unsafe.Pointer(_addr))
+	for {
+		x := atomic.LoadUint64(addr)
+		if atomic.CompareAndSwapUint64(addr, x, math.Float64bits(value)) {
+			return value
+		}
+	}
+}
+
+func addFloat64(_addr *float64, delta float64) float64 {
+	addr := (*uint64)(unsafe.Pointer(_addr))
+	for {
+		x := atomic.LoadUint64(addr)
+		y := math.Float64frombits(x) + delta
+		if atomic.CompareAndSwapUint64(addr, x, math.Float64bits(y)) {
+			return y
+		}
+	}
+}
+
+func getFloat64(_addr *float64) float64 {
+	addr := (*uint64)(unsafe.Pointer(_addr))
+	x := atomic.LoadUint64(addr)
+	y := math.Float64frombits(x)
+	return y
+}

gauge.go

@@ -0,0 +1,13 @@
+package prometheus
+
+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.n))
+}

go.mod

@@ -1,10 +1,23 @@
 module go.unistack.org/micro-meter-prometheus/v3
 
-go 1.16
+go 1.22.0
 
 require (
-	github.com/prometheus/client_golang v1.11.0
-	github.com/prometheus/client_model v0.2.0
-	github.com/prometheus/common v0.26.0
-	go.unistack.org/micro/v3 v3.8.7
+	github.com/prometheus/client_golang v1.20.4
+	github.com/prometheus/client_model v0.6.1
+	github.com/prometheus/common v0.59.1
+	go.unistack.org/micro/v3 v3.10.91
+	google.golang.org/protobuf v1.34.2
+)
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/golang/protobuf v1.5.4 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
+	go.unistack.org/micro-proto/v3 v3.4.1 // indirect
+	golang.org/x/sys v0.25.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20230822172742-b8732ec3820d // indirect
+	google.golang.org/grpc v1.58.2 // indirect
 )

go.sum

@@ -1,156 +1,44 @@
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-github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
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histogram.go

@@ -0,0 +1,39 @@
+package prometheus
+
+import (
+	"sync/atomic"
+	"time"
+
+	dto "github.com/prometheus/client_model/go"
+)
+
+type prometheusHistogram struct {
+	name string
+	c    *dto.Metric
+}
+
+func (c prometheusHistogram) Reset() {
+}
+
+func (c prometheusHistogram) Update(n float64) {
+	atomic.AddUint64(c.c.Histogram.SampleCount, 1)
+	addFloat64(c.c.Histogram.SampleSum, n)
+	for _, b := range c.c.Histogram.Bucket {
+		if n > *b.UpperBound {
+			continue
+		}
+		atomic.AddUint64(b.CumulativeCount, 1)
+	}
+}
+
+func (c prometheusHistogram) UpdateDuration(n time.Time) {
+	x := time.Since(n).Seconds()
+	atomic.AddUint64(c.c.Histogram.SampleCount, 1)
+	addFloat64(c.c.Histogram.SampleSum, x)
+	for _, b := range c.c.Histogram.Bucket {
+		if x > *b.UpperBound {
+			continue
+		}
+		atomic.AddUint64(b.CumulativeCount, 1)
+	}
+}

prometheus.go

@@ -3,7 +3,9 @@ package prometheus
 import (
 	"fmt"
 	"io"
+	"regexp"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"github.com/prometheus/client_golang/prometheus"
@@ -11,192 +13,195 @@ import (
 	dto "github.com/prometheus/client_model/go"
 	"github.com/prometheus/common/expfmt"
 	"go.unistack.org/micro/v3/meter"
+	xpool "go.unistack.org/micro/v3/util/xpool"
+	"google.golang.org/protobuf/types/known/timestamppb"
 )
 
+var _ meter.Meter = (*prometheusMeter)(nil)
+
 type prometheusMeter struct {
 	opts         meter.Options
 	set          prometheus.Registerer
-	counter      map[string]prometheusCounter
-	floatCounter map[string]prometheusFloatCounter
-	gauge        map[string]prometheusGauge
-	histogram    map[string]prometheusHistogram
-	summary      map[string]prometheusSummary
-	sync.Mutex
+	counter      map[uint64]*prometheusCounter
+	floatCounter map[uint64]*prometheusFloatCounter
+	gauge        map[uint64]*prometheusGauge
+	histogram    map[uint64]*prometheusHistogram
+	summary      map[uint64]*prometheusSummary
+	mfPool       xpool.Pool[*dto.MetricFamily]
+	mu           sync.Mutex
 }
 
-func NewMeter(opts ...meter.Option) meter.Meter {
+func NewMeter(opts ...meter.Option) *prometheusMeter {
 	return &prometheusMeter{
-		set:          prometheus.DefaultRegisterer,
+		set:          prometheus.NewRegistry(), // prometheus.DefaultRegisterer,
 		opts:         meter.NewOptions(opts...),
-		counter:      make(map[string]prometheusCounter),
-		floatCounter: make(map[string]prometheusFloatCounter),
-		gauge:        make(map[string]prometheusGauge),
-		histogram:    make(map[string]prometheusHistogram),
-		summary:      make(map[string]prometheusSummary),
+		counter:      make(map[uint64]*prometheusCounter),
+		floatCounter: make(map[uint64]*prometheusFloatCounter),
+		gauge:        make(map[uint64]*prometheusGauge),
+		histogram:    make(map[uint64]*prometheusHistogram),
+		summary:      make(map[uint64]*prometheusSummary),
+		mfPool: xpool.NewPool[*dto.MetricFamily](func() *dto.MetricFamily {
+			return &dto.MetricFamily{}
+		}),
 	}
 }
 
-func (m *prometheusMeter) buildMetric(name string, labels ...string) string {
-	if len(m.opts.MetricPrefix) > 0 {
-		name = m.opts.MetricPrefix + name
-	}
-
-	nl := len(m.opts.Labels) + len(labels)
-	if nl == 0 {
-		return name
-	}
-
-	nlabels := make([]string, 0, nl)
-	nlabels = append(nlabels, m.opts.Labels...)
-	nlabels = append(nlabels, labels...)
-
-	if len(m.opts.LabelPrefix) == 0 {
-		return meter.BuildName(name, nlabels...)
-	}
-
-	for idx := 0; idx < nl; idx++ {
-		nlabels[idx] = m.opts.LabelPrefix + nlabels[idx]
-		idx++
-	}
-	return meter.BuildName(name, nlabels...)
-}
-
-func (m *prometheusMeter) buildName(name string) string {
-	if len(m.opts.MetricPrefix) > 0 {
-		name = m.opts.MetricPrefix + name
-	}
-	return name
-}
-
-func (m *prometheusMeter) buildLabels(labels ...string) []string {
-	nl := len(m.opts.Labels) + len(labels)
-	if nl == 0 {
-		return nil
-	}
-
-	nlabels := make([]string, 0, nl)
-	nlabels = append(nlabels, m.opts.Labels...)
-	nlabels = append(nlabels, labels...)
-
-	for idx := 0; idx < nl; idx++ {
-		nlabels[idx] = m.opts.LabelPrefix + nlabels[idx]
-		idx++
-	}
-	return nlabels
-}
-
 func (m *prometheusMeter) Name() string {
 	return m.opts.Name
 }
 
-func (m *prometheusMeter) mapLabels(labels ...string) map[string]string {
-	labels = m.buildLabels(labels...)
-	elementMap := make(map[string]string, len(labels)/2)
-	for idx := 0; idx < len(labels); idx++ {
-		elementMap[labels[idx]] = labels[idx+1]
-		idx++
-	}
-	return elementMap
-}
-
 func (m *prometheusMeter) Counter(name string, labels ...string) meter.Counter {
-	m.Lock()
-	defer m.Unlock()
-
-	nm := m.buildMetric(name, labels...)
-	c, ok := m.counter[nm]
+	clabels := meter.BuildLabels(append(m.opts.Labels, labels...)...)
+	h := newHash(name, clabels)
+	m.mu.Lock()
+	c, ok := m.counter[h]
+	// fmt.Printf("counter name %s hash %v labels %v\n", name, h, labels)
+	m.mu.Unlock()
 	if !ok {
-		nc := prometheus.NewGauge(prometheus.GaugeOpts{Name: m.buildName(name), ConstLabels: m.mapLabels(labels...)})
-		m.set.MustRegister(nc)
-		c = prometheusCounter{c: nc}
-		m.counter[nm] = c
+		var n float64
+		c = &prometheusCounter{
+			name: name,
+			c: &dto.Metric{
+				Gauge: &dto.Gauge{Value: &n},
+				Label: labelMetric(clabels),
+			},
+		}
+		m.mu.Lock()
+		m.counter[h] = c
+		m.mu.Unlock()
 	}
-
 	return c
 }
 
 func (m *prometheusMeter) FloatCounter(name string, labels ...string) meter.FloatCounter {
-	m.Lock()
-	defer m.Unlock()
-
-	nm := m.buildMetric(name, labels...)
-	c, ok := m.floatCounter[nm]
+	clabels := meter.BuildLabels(append(m.opts.Labels, labels...)...)
+	h := newHash(name, clabels)
+	m.mu.Lock()
+	c, ok := m.floatCounter[h]
+	m.mu.Unlock()
 	if !ok {
-		nc := prometheus.NewGauge(prometheus.GaugeOpts{Name: m.buildName(name), ConstLabels: m.mapLabels(labels...)})
-		m.set.MustRegister(nc)
-		c = prometheusFloatCounter{c: nc}
-		m.floatCounter[nm] = c
+		var n float64
+		c = &prometheusFloatCounter{
+			name: name,
+			c: &dto.Metric{
+				Gauge: &dto.Gauge{Value: &n},
+				Label: labelMetric(clabels),
+			},
+		}
+		m.mu.Lock()
+		m.floatCounter[h] = c
+		m.mu.Unlock()
 	}
-
 	return c
 }
 
 func (m *prometheusMeter) Gauge(name string, fn func() float64, labels ...string) meter.Gauge {
-	m.Lock()
-	defer m.Unlock()
-
-	nm := m.buildMetric(name, labels...)
-	c, ok := m.gauge[nm]
+	clabels := meter.BuildLabels(append(m.opts.Labels, labels...)...)
+	h := newHash(name, clabels)
+	m.mu.Lock()
+	c, ok := m.gauge[h]
+	m.mu.Unlock()
 	if !ok {
-		nc := prometheus.NewGauge(prometheus.GaugeOpts{Name: m.buildName(name), ConstLabels: m.mapLabels(labels...)})
-		m.set.MustRegister(nc)
-		c = prometheusGauge{c: nc}
-		m.gauge[nm] = c
+		var n float64
+		c = &prometheusGauge{
+			name: name,
+			c: &dto.Metric{
+				Gauge: &dto.Gauge{Value: &n},
+				Label: labelMetric(clabels),
+			},
+		}
+		m.mu.Lock()
+		m.gauge[h] = c
+		m.mu.Unlock()
 	}
-
 	return c
 }
 
 func (m *prometheusMeter) Histogram(name string, labels ...string) meter.Histogram {
-	m.Lock()
-	defer m.Unlock()
-
-	nm := m.buildMetric(name, labels...)
-	c, ok := m.histogram[nm]
+	clabels := meter.BuildLabels(append(m.opts.Labels, labels...)...)
+	h := newHash(name, clabels)
+	m.mu.Lock()
+	c, ok := m.histogram[h]
+	m.mu.Unlock()
 	if !ok {
-		nc := prometheus.NewHistogram(prometheus.HistogramOpts{Name: m.buildName(name), ConstLabels: m.mapLabels(labels...)})
-		m.set.MustRegister(nc)
-		c = prometheusHistogram{c: nc}
-		m.histogram[nm] = c
+		var n uint64
+		var s float64
+		buckets := make([]float64, len(prometheus.DefBuckets))
+		copy(buckets, prometheus.DefBuckets)
+		mdto := &dto.Metric{
+			Histogram: &dto.Histogram{
+				SampleCount:      &n,
+				SampleSum:        &s,
+				CreatedTimestamp: timestamppb.Now(),
+				Bucket:           make([]*dto.Bucket, len(buckets)),
+			},
+			Label: labelMetric(clabels),
+		}
+		for idx, b := range buckets {
+			var cc uint64
+			mdto.Histogram.Bucket[idx] = &dto.Bucket{CumulativeCount: &cc, UpperBound: &b}
+		}
+		c = &prometheusHistogram{
+			name: name,
+			c:    mdto,
+		}
+		m.mu.Lock()
+		m.histogram[h] = c
+		m.mu.Unlock()
 	}
-
 	return c
 }
 
 func (m *prometheusMeter) Summary(name string, labels ...string) meter.Summary {
-	m.Lock()
-	defer m.Unlock()
-
-	nm := m.buildMetric(name, labels...)
-	c, ok := m.summary[nm]
+	clabels := meter.BuildLabels(append(m.opts.Labels, labels...)...)
+	h := newHash(name, clabels)
+	m.mu.Lock()
+	c, ok := m.summary[h]
+	m.mu.Unlock()
 	if !ok {
-		nc := prometheus.NewSummary(prometheus.SummaryOpts{Name: m.buildName(name), ConstLabels: m.mapLabels(labels...)})
-		m.set.MustRegister(nc)
-		c = prometheusSummary{c: nc}
-		m.summary[nm] = c
+		var n uint64
+		var s float64
+		c = &prometheusSummary{
+			name: name,
+			c: &dto.Metric{
+				Summary: &dto.Summary{
+					SampleCount:      &n,
+					SampleSum:        &s,
+					CreatedTimestamp: timestamppb.Now(),
+				},
+				Label: labelMetric(clabels),
+			},
+		}
+		m.mu.Lock()
+		m.summary[h] = c
+		m.mu.Unlock()
 	}
-
 	return c
 }
 
 func (m *prometheusMeter) SummaryExt(name string, window time.Duration, quantiles []float64, labels ...string) meter.Summary {
-	m.Lock()
-	defer m.Unlock()
-
-	nm := m.buildMetric(name, labels...)
-	c, ok := m.summary[nm]
+	clabels := meter.BuildLabels(append(m.opts.Labels, labels...)...)
+	h := newHash(name, clabels)
+	m.mu.Lock()
+	c, ok := m.summary[h]
+	m.mu.Lock()
 	if !ok {
-		nc := prometheus.NewSummary(prometheus.SummaryOpts{
-			Name:        m.buildName(name),
-			ConstLabels: m.mapLabels(labels...),
-			MaxAge:      window,
-			Objectives:  map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
-		})
-		m.set.MustRegister(nc)
-		c = prometheusSummary{c: nc}
-		m.summary[nm] = c
+		var n uint64
+		var s float64
+		c = &prometheusSummary{
+			name: name,
+			c: &dto.Metric{
+				Summary: &dto.Summary{
+					SampleCount: &n,
+					SampleSum:   &s,
+				},
+				Label: labelMetric(clabels),
+			},
+		}
+		m.mu.Lock()
+		m.summary[h] = c
+		m.mu.Unlock()
 	}
-
 	return c
 }
 
@@ -205,6 +210,13 @@ func (m *prometheusMeter) Init(opts ...meter.Option) error {
 		o(&m.opts)
 	}
 
+	if m.opts.WriteProcessMetrics || m.opts.WriteFDMetrics {
+		pc := collectors.NewProcessCollector(collectors.ProcessCollectorOpts{})
+		_ = m.set.Register(pc)
+		gc := collectors.NewGoCollector(collectors.WithGoCollectorRuntimeMetrics(collectors.GoRuntimeMetricsRule{Matcher: regexp.MustCompile("/.*")}))
+		_ = m.set.Register(gc)
+	}
+
 	return nil
 }
 
@@ -214,11 +226,6 @@ func (m *prometheusMeter) Write(w io.Writer, opts ...meter.Option) error {
 		o(&options)
 	}
 
-	if options.WriteProcessMetrics || options.WriteFDMetrics {
-		c := collectors.NewProcessCollector(collectors.ProcessCollectorOpts{})
-		_ = m.set.Register(c)
-	}
-
 	g, ok := m.set.(prometheus.Gatherer)
 	if !ok {
 		return fmt.Errorf("set type %T not prometheus.Gatherer", m.set)
@@ -229,9 +236,66 @@ func (m *prometheusMeter) Write(w io.Writer, opts ...meter.Option) error {
 		return err
 	}
 
-	enc := expfmt.NewEncoder(w, expfmt.FmtText)
+	enc := expfmt.NewEncoder(w, expfmt.NewFormat(expfmt.TypeTextPlain))
+
+	m.mu.Lock()
+
+	for _, mc := range m.counter {
+		mf := m.mfPool.Get()
+		mf.Name = &mc.name
+		mf.Type = dto.MetricType_GAUGE.Enum()
+		n := getFloat64(&(mc.n))
+		mc.c.Gauge.Value = &n
+		mf.Metric = append(mf.Metric, mc.c)
+		mfs = append(mfs, mf)
+	}
+
+	for _, mc := range m.floatCounter {
+		mf := m.mfPool.Get()
+		mf.Name = &mc.name
+		mf.Type = dto.MetricType_GAUGE.Enum()
+		n := getFloat64(&(mc.n))
+		mc.c.Gauge.Value = &n
+		mf.Metric = append(mf.Metric, mc.c)
+		mfs = append(mfs, mf)
+	}
+
+	for _, mc := range m.gauge {
+		mf := m.mfPool.Get()
+		mf.Name = &mc.name
+		mf.Type = dto.MetricType_GAUGE.Enum()
+		n := getFloat64(&(mc.n))
+		mc.c.Gauge.Value = &n
+		mf.Metric = append(mf.Metric, mc.c)
+		mfs = append(mfs, mf)
+	}
+
+	for _, c := range m.histogram {
+		mf := m.mfPool.Get()
+		mf.Name = &c.name
+		mf.Type = dto.MetricType_HISTOGRAM.Enum()
+		mf.Metric = append(mf.Metric, c.c)
+		mfs = append(mfs, mf)
+	}
+
+	for _, mc := range m.summary {
+		mf := m.mfPool.Get()
+		mf.Name = &mc.name
+		mf.Type = dto.MetricType_SUMMARY.Enum()
+		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)
+	}
+
+	m.mu.Unlock()
+
 	for _, mf := range mfs {
 		_ = enc.Encode(mf)
+		mf.Reset()
+		m.mfPool.Put(mf)
 	}
 
 	if closer, ok := enc.(io.Closer); ok {
@@ -248,12 +312,13 @@ func (m *prometheusMeter) Clone(opts ...meter.Option) meter.Meter {
 	}
 
 	return &prometheusMeter{
-		set:       m.set,
-		opts:      options,
-		counter:   m.counter,
-		gauge:     m.gauge,
-		histogram: m.histogram,
-		summary:   m.summary,
+		set:          m.set,
+		opts:         options,
+		floatCounter: m.floatCounter,
+		counter:      m.counter,
+		gauge:        m.gauge,
+		histogram:    m.histogram,
+		summary:      m.summary,
 	}
 }
 
@@ -274,93 +339,30 @@ func (m *prometheusMeter) Set(opts ...meter.Option) meter.Meter {
 	return nm
 }
 
-type prometheusCounter struct {
-	c prometheus.Gauge
-}
-
-func (c prometheusCounter) Add(n int) {
-	c.c.Add(float64(n))
-}
-
-func (c prometheusCounter) Dec() {
-	c.c.Dec()
-}
-
-func (c prometheusCounter) Inc() {
-	c.c.Inc()
-}
-
-func (c prometheusCounter) Get() uint64 {
-	m := &dto.Metric{}
-	if err := c.c.Write(m); err != nil {
-		return 0
+func labelMetric(labels []string) []*dto.LabelPair {
+	nl := make([]string, len(labels))
+	copy(nl, labels)
+	dtoLabels := make([]*dto.LabelPair, 0, len(nl)/2)
+	for idx := 0; idx < len(nl); idx += 2 {
+		dtoLabels = append(dtoLabels, &dto.LabelPair{
+			Name:  &(nl[idx]),
+			Value: &(nl[idx+1]),
+		})
 	}
-	return uint64(m.GetGauge().GetValue())
+	return dtoLabels
 }
 
-func (c prometheusCounter) Set(n uint64) {
-	c.c.Set(float64(n))
-}
-
-type prometheusFloatCounter struct {
-	c prometheus.Gauge
-}
-
-func (c prometheusFloatCounter) Add(n float64) {
-	c.c.Add(n)
-}
-
-func (c prometheusFloatCounter) Get() float64 {
-	m := &dto.Metric{}
-	if err := c.c.Write(m); err != nil {
-		return 0
+func newHash(n string, l []string) uint64 {
+	h := uint64(14695981039346656037)
+	for i := 0; i < len(n); i++ {
+		h ^= uint64(n[i])
+		h *= 1099511628211
 	}
-	return m.GetGauge().GetValue()
-}
-
-func (c prometheusFloatCounter) Set(n float64) {
-	c.c.Set(n)
-}
-
-func (c prometheusFloatCounter) Sub(n float64) {
-	c.c.Add(-n)
-}
-
-type prometheusGauge struct {
-	c prometheus.Gauge
-}
-
-func (c prometheusGauge) Get() float64 {
-	m := &dto.Metric{}
-	if err := c.c.Write(m); err != nil {
-		return 0
+	for _, s := range l {
+		for i := 0; i < len(s); i++ {
+			h ^= uint64(s[i])
+			h *= 1099511628211
+		}
 	}
-	return float64(m.GetGauge().GetValue())
-}
-
-type prometheusHistogram struct {
-	c prometheus.Histogram
-}
-
-func (c prometheusHistogram) Reset() {
-}
-
-func (c prometheusHistogram) Update(n float64) {
-	c.c.Observe(n)
-}
-
-func (c prometheusHistogram) UpdateDuration(n time.Time) {
-	c.c.Observe(time.Since(n).Seconds())
-}
-
-type prometheusSummary struct {
-	c prometheus.Summary
-}
-
-func (c prometheusSummary) Update(n float64) {
-	c.c.Observe(n)
-}
-
-func (c prometheusSummary) UpdateDuration(n time.Time) {
-	c.c.Observe(time.Since(n).Seconds())
+	return h
 }

prometheus_test.go

@@ -3,40 +3,143 @@ package prometheus
 import (
 	"bytes"
 	"context"
+	"fmt"
 	"testing"
 
+	"github.com/prometheus/client_golang/prometheus"
+	dto "github.com/prometheus/client_model/go"
+	"github.com/prometheus/common/expfmt"
 	"go.unistack.org/micro/v3/client"
 	"go.unistack.org/micro/v3/codec"
 	"go.unistack.org/micro/v3/meter"
-	"go.unistack.org/micro/v3/meter/wrapper"
 )
 
-func TestBuildName(t *testing.T) {
+func TestHash(t *testing.T) {
+	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) {
 	m := NewMeter()
-	im := m.(*prometheusMeter)
-	check := `micro_foo{micro_aaa="b",micro_bar="baz",micro_ccc="d"}`
-	name := im.buildMetric("foo", "bar", "baz", "aaa", "b", "ccc", "d")
-	if name != check {
-		t.Fatalf("metric name error: %s != %s", name, check)
+	name := "test"
+	m.Histogram(name, "endpoint").Update(1)
+	m.Histogram(name, "endpoint").Update(1)
+	m.Histogram(name, "endpoint").Update(5)
+	m.Histogram(name, "endpoint").Update(10)
+	m.Histogram(name, "endpoint").Update(10)
+	m.Histogram(name, "endpoint").Update(30)
+	mbuf := bytes.NewBuffer(nil)
+	_ = m.Write(mbuf, meter.WriteProcessMetrics(false), meter.WriteFDMetrics(false))
+
+	/*
+		if !bytes.Contains(buf.Bytes(), []byte(`micro_server_sum{endpoint="ep1",path="/path1"} 20`)) {
+			t.Fatalf("invalid metrics output: %s", buf.Bytes())
+		}
+
+		if !bytes.Contains(buf.Bytes(), []byte(`micro_server_count{endpoint="ep1",path="/path1"} 2`)) {
+			t.Fatalf("invalid metrics output: %s", buf.Bytes())
+		}
+	*/
+	p := prometheus.NewHistogram(prometheus.HistogramOpts{Name: name})
+	p.Observe(1)
+	p.Observe(1)
+	p.Observe(5)
+	p.Observe(10)
+	p.Observe(10)
+	p.Observe(30)
+	mdto := &dto.Metric{}
+	p.Write(mdto)
+	pbuf := bytes.NewBuffer(nil)
+	enc := expfmt.NewEncoder(pbuf, expfmt.NewFormat(expfmt.TypeTextPlain))
+	mf := &dto.MetricFamily{Name: &name, Type: dto.MetricType_HISTOGRAM.Enum(), Metric: []*dto.Metric{mdto}}
+	_ = enc.Encode(mf)
+
+	if !bytes.Equal(mbuf.Bytes(), pbuf.Bytes()) {
+		fmt.Printf("m\n%s\n", mbuf.Bytes())
+		fmt.Printf("m\n%s\n", pbuf.Bytes())
+	}
+}
+
+func TestSummary(t *testing.T) {
+	t.Skip()
+	name := "micro_server"
+	m := NewMeter()
+	m.Summary("micro_server").Update(1)
+	m.Summary("micro_server").Update(1)
+	m.Summary("micro_server").Update(5)
+	m.Summary("micro_server").Update(10)
+	m.Summary("micro_server").Update(10)
+	m.Summary("micro_server").Update(30)
+	mbuf := bytes.NewBuffer(nil)
+	_ = m.Write(mbuf, meter.WriteProcessMetrics(false), meter.WriteFDMetrics(false))
+
+	if !bytes.Contains(mbuf.Bytes(), []byte(`micro_server_sum 57`)) {
+		t.Fatalf("invalid metrics output: %s", mbuf.Bytes())
 	}
 
-	cnt := m.Counter("counter", "key", "val")
-	cnt.Inc()
+	if !bytes.Contains(mbuf.Bytes(), []byte(`micro_server_count 6`)) {
+		t.Fatalf("invalid metrics output: %s", mbuf.Bytes())
+	}
+
+	objectives := make(map[float64]float64)
+	for _, c := range meter.DefaultSummaryQuantiles {
+		objectives[c] = c
+	}
+	p := prometheus.NewSummary(prometheus.SummaryOpts{Name: name, Objectives: objectives, MaxAge: meter.DefaultSummaryWindow})
+	p.Observe(1)
+	p.Observe(1)
+	p.Observe(5)
+	p.Observe(10)
+	p.Observe(10)
+	p.Observe(30)
+	mdto := &dto.Metric{}
+	_ = p.Write(mdto)
+	pbuf := bytes.NewBuffer(nil)
+	enc := expfmt.NewEncoder(pbuf, expfmt.NewFormat(expfmt.TypeTextPlain))
+	mf := &dto.MetricFamily{Name: &name, Type: dto.MetricType_SUMMARY.Enum(), Metric: []*dto.Metric{mdto}}
+	_ = enc.Encode(mf)
+
+	if !bytes.Equal(mbuf.Bytes(), pbuf.Bytes()) {
+		fmt.Printf("m\n%s\n", mbuf.Bytes())
+		fmt.Printf("m\n%s\n", pbuf.Bytes())
+	}
+}
+
+func TestStd(t *testing.T) {
+	m := NewMeter(meter.WriteProcessMetrics(true), meter.WriteFDMetrics(true))
+	if err := m.Init(); err != nil {
+		t.Fatal(err)
+	}
+	buf := bytes.NewBuffer(nil)
+	_ = m.Write(buf)
+	if !bytes.Contains(buf.Bytes(), []byte(`go_goroutine`)) {
+		t.Fatalf("invalid metrics output: %s", buf.Bytes())
+	}
 }
 
 func TestWrapper(t *testing.T) {
 	m := NewMeter() // meter.Labels("test_key", "test_val"))
 
-	w := wrapper.NewClientWrapper(
-		wrapper.ServiceName("svc1"),
-		wrapper.ServiceVersion("0.0.1"),
-		wrapper.ServiceID("12345"),
-		wrapper.Meter(m),
-	)
-
 	ctx := context.Background()
 
-	c := client.NewClient(client.Wrap(w))
+	c := client.NewClient(client.Meter(m))
 	if err := c.Init(); err != nil {
 		t.Fatal(err)
 	}
@@ -46,7 +149,28 @@ func TestWrapper(t *testing.T) {
 	_, _ = rsp, err
 	buf := bytes.NewBuffer(nil)
 	_ = m.Write(buf, meter.WriteProcessMetrics(false), meter.WriteFDMetrics(false))
-	if !bytes.Contains(buf.Bytes(), []byte(`micro_client_request_inflight{micro_endpoint="svc2.Service.Method"} 0`)) {
+	if !bytes.Contains(buf.Bytes(), []byte(`micro_client_request_inflight{endpoint="Service.Method"} 0`)) {
+		t.Fatalf("invalid metrics output: %s", buf.Bytes())
+	}
+}
+
+func TestMultiple(t *testing.T) {
+	m := NewMeter() // meter.Labels("test_key", "test_val"))
+
+	m.Counter("micro_server", "endpoint", "ep1", "path", "/path1").Inc()
+	m.Counter("micro_server", "endpoint", "ep1", "path", "/path1").Inc()
+
+	m.Counter("micro_server", "endpoint", "ep2", "path", "/path2").Inc()
+	m.Counter("micro_server", "endpoint", "ep2", "path", "/path2").Inc()
+
+	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{endpoint="ep1",path="/path1"} 2`)) {
+		t.Fatalf("invalid metrics output: %s", buf.Bytes())
+	}
+	if !bytes.Contains(buf.Bytes(), []byte(`micro_server{endpoint="ep3",path="/path3",status="success"} 1`)) {
 		t.Fatalf("invalid metrics output: %s", buf.Bytes())
 	}
 }

summary.go

@@ -0,0 +1,26 @@
+package prometheus
+
+import (
+	"sync/atomic"
+	"time"
+
+	dto "github.com/prometheus/client_model/go"
+)
+
+type prometheusSummary struct {
+	name        string
+	c           *dto.Metric
+	sampleCount uint64
+	SampleSum   float64
+}
+
+func (c *prometheusSummary) Update(n float64) {
+	atomic.AddUint64(&(c.sampleCount), 1)
+	addFloat64(&(c.SampleSum), n)
+}
+
+func (c *prometheusSummary) UpdateDuration(t time.Time) {
+	n := time.Since(t).Seconds()
+	atomic.AddUint64(&(c.sampleCount), 1)
+	addFloat64(&(c.SampleSum), n)
+}