reuse sync.Map

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

.gitea/ISSUE_TEMPLATE/bug_report.md

@@ -1,6 +1,6 @@
 ---
 name: Bug report
-about: For reporting bugs in micro
+about: For reporting bugs in go-micro
 title: "[BUG]"
 labels: ''
 assignees: ''
@@ -16,3 +16,9 @@ assignees: ''
 **How to reproduce the bug:**
 
 If possible, please include a minimal code snippet here.
+
+**Environment:**
+Go Version: please paste `go version` output here
+```
+please paste `go env` output here
+```

.gitea/ISSUE_TEMPLATE/feature-request---enhancement.md

@@ -1,6 +1,6 @@
 ---
 name: Feature request / Enhancement
-about: If you have a need not served by micro
+about: If you have a need not served by go-micro
 title: "[FEATURE]"
 labels: ''
 assignees: ''
@@ -14,4 +14,4 @@ A clear and concise description of what the problem is. Ex. I'm always frustrate
 A clear and concise description of what you want to happen.
 
 **Additional context**
-Add any other context or screenshots about the feature request here.
+Add any other context or screenshots about the feature request here.

.gitea/ISSUE_TEMPLATE/question.md

@@ -1,8 +1,14 @@
 ---
 name: Question
-about: Ask a question about micro
+about: Ask a question about go-micro
 title: ''
 labels: ''
 assignees: ''
 
----
+---
+
+Before asking, please check if your question has already been answered: 
+
+1. Check the documentation - https://micro.mu/docs/
+2. Check the examples and plugins - https://github.com/micro/examples & https://github.com/micro/go-plugins
+3. Search existing issues

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

@@ -1,24 +1,27 @@
-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
+	github.com/prometheus/client_golang v1.20.4
 	github.com/prometheus/client_model v0.6.1
-	github.com/prometheus/common v0.62.0
-	go.unistack.org/micro/v4 v4.1.2
+	github.com/prometheus/common v0.59.1
+	go.unistack.org/micro/v3 v3.10.91
+	google.golang.org/protobuf v1.35.2
 )
 
 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/matttproud/golang_protobuf_extensions v1.0.4 // indirect
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/klauspost/compress v1.17.11 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/prometheus/procfs v0.15.1 // indirect
-	github.com/spf13/cast v1.7.1 // indirect
-	golang.org/x/sys v0.30.0 // indirect
-	google.golang.org/protobuf v1.36.5 // indirect
+	github.com/stretchr/testify v1.10.0 // indirect
+	go.unistack.org/micro-proto/v3 v3.4.1 // indirect
+	golang.org/x/net v0.32.0 // indirect
+	golang.org/x/sys v0.28.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20241209162323-e6fa225c2576 // indirect
+	google.golang.org/grpc v1.68.1 // indirect
 )

go.sum

@@ -1,86 +1,34 @@
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
-github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
-github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/go-logfmt/logfmt v0.5.1/go.mod h1:WYhtIu8zTZfxdn5+rREduYbwxfcBr/Vr6KEVveWlfTs=
-github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/golang/protobuf v1.3.5/go.mod h1:6O5/vntMXwX2lRkT1hjjk0nAC1IDOTvTlVgjlRvqsdk=
-github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
-github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
-github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
+github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
 github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
 github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
-github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
-github.com/jpillora/backoff v1.0.0/go.mod h1:J/6gKK9jxlEcS3zixgDgUAsiuZ7yrSoa/FX5e0EB2j4=
-github.com/json-iterator/go v1.1.12/go.mod h1:e30LSqwooZae/UwlEbR2852Gd8hjQvJoHmT4TnhNGBo=
-github.com/julienschmidt/httprouter v1.3.0/go.mod h1:JR6WtHb+2LUe8TCKY3cZOxFyyO8IZAc4RVcycCCAKdM=
-github.com/matttproud/golang_protobuf_extensions v1.0.4 h1:mmDVorXM7PCGKw94cs5zkfA9PSy5pEvNWRP0ET0TIVo=
-github.com/matttproud/golang_protobuf_extensions v1.0.4/go.mod h1:BSXmuO+STAnVfrANrmjBb36TMTDstsz7MSK+HVaYKv4=
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 github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
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-github.com/prometheus/common v0.41.0 h1:npo01n6vUlRViIj5fgwiK8vlNIh8bnoxqh3gypKsyAw=
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+go.unistack.org/micro/v3 v3.10.91/go.mod h1:erMgt3Bl7vQQ0e9UpQyR5NlLiZ9pKeEJ9+1tfYFaqUg=
+golang.org/x/net v0.32.0 h1:ZqPmj8Kzc+Y6e0+skZsuACbx+wzMgo5MQsJh9Qd6aYI=
+golang.org/x/sys v0.28.0 h1:Fksou7UEQUWlKvIdsqzJmUmCX3cZuD2+P3XyyzwMhlA=
+golang.org/x/text v0.21.0 h1:zyQAAkrwaneQ066sspRyJaG9VNi/YJ1NfzcGB3hZ/qo=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20241209162323-e6fa225c2576 h1:8ZmaLZE4XWrtU3MyClkYqqtl6Oegr3235h7jxsDyqCY=
+google.golang.org/grpc v1.68.1 h1:oI5oTa11+ng8r8XMMN7jAOmWfPZWbYpCFaMUTACxkM0=
+google.golang.org/protobuf v1.35.2 h1:8Ar7bF+apOIoThw1EdZl0p1oWvMqTHmpA2fRTyZO8io=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

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

@@ -2,243 +2,216 @@ package prometheus
 
 import (
 	"fmt"
-	"hash/fnv"
 	"io"
 	"regexp"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/collectors"
 	dto "github.com/prometheus/client_model/go"
 	"github.com/prometheus/common/expfmt"
-	"go.unistack.org/micro/v4/meter"
+	"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{}
+var _ meter.Meter = (*prometheusMeter)(nil)
 
 type prometheusMeter struct {
 	opts         meter.Options
 	set          prometheus.Registerer
-	counter      map[string]*counters
-	floatCounter map[string]*floatCounters
-	gauge        map[string]*gauges
-	histogram    map[string]*histograms
-	summary      map[string]*summaries
-	sync.Mutex
-}
-
-type counters struct {
-	cs map[uint64]*prometheusCounter
-}
-
-type gauges struct {
-	cs map[uint64]*prometheusGauge
-}
-
-type histograms struct {
-	cs map[uint64]*prometheusHistogram
-}
-
-type summaries struct {
-	cs map[uint64]*prometheusSummary
-}
-
-type floatCounters struct {
-	cs map[uint64]*prometheusFloatCounter
-}
-
-/*
-func newFloat64(v float64) *float64 {
-	nv := v
-	return &nv
-}
-*/
-
-func newString(v string) *string {
-	nv := v
-	return &nv
+	counter      sync.Map
+	floatCounter sync.Map
+	gauge        sync.Map
+	histogram    sync.Map
+	summary      sync.Map
+	mfPool       xpool.Pool[*dto.MetricFamily]
+	mu           sync.Mutex
 }
 
 func NewMeter(opts ...meter.Option) *prometheusMeter {
 	return &prometheusMeter{
-		set:          prometheus.NewRegistry(), // prometheus.DefaultRegisterer,
-		opts:         meter.NewOptions(opts...),
-		counter:      make(map[string]*counters),
-		floatCounter: make(map[string]*floatCounters),
-		gauge:        make(map[string]*gauges),
-		histogram:    make(map[string]*histograms),
-		summary:      make(map[string]*summaries),
+		set:  prometheus.NewRegistry(), // prometheus.DefaultRegisterer,
+		opts: meter.NewOptions(opts...),
+		mfPool: xpool.NewPool[*dto.MetricFamily](func() *dto.MetricFamily {
+			return &dto.MetricFamily{}
+		}),
 	}
 }
 
-func (m *prometheusMeter) buildMetric(name string, labels ...string) string {
-	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...)
-
-	return meter.BuildName(name, nlabels...)
-}
-
 func (m *prometheusMeter) Name() string {
 	return m.opts.Name
 }
 
 func (m *prometheusMeter) Counter(name string, labels ...string) meter.Counter {
-	m.Lock()
-	defer m.Unlock()
-	nm := m.buildMetric(name)
-	labels = append(m.opts.Labels, labels...)
-	cd, ok := m.counter[nm]
-	h := newHash(labels)
+	clabels := meter.BuildLabels(append(m.opts.Labels, labels...)...)
+	h := newHash(name, clabels)
+	m.mu.Lock()
+	c, ok := m.counter.Load(h)
+	// fmt.Printf("counter name %s hash %v labels %v\n", name, h, labels)
+	m.mu.Unlock()
 	if !ok {
-		cd = &counters{cs: make(map[uint64]*prometheusCounter)}
-		c := &prometheusCounter{c: prometheus.NewGauge(prometheus.GaugeOpts{Name: nm}), labels: labels}
-		cd.cs[h] = c
-		m.counter[nm] = cd
-		return c
+		var n float64
+		c = &prometheusCounter{
+			name: name,
+			c: &dto.Metric{
+				Gauge: &dto.Gauge{Value: &n},
+				Label: labelMetric(clabels),
+			},
+		}
+		m.mu.Lock()
+		m.counter.Store(h, c)
+		m.mu.Unlock()
 	}
-	c, ok := cd.cs[h]
-	if !ok {
-		c = &prometheusCounter{c: prometheus.NewGauge(prometheus.GaugeOpts{Name: nm}), labels: labels}
-		cd.cs[h] = c
-		m.counter[nm] = cd
-	}
-	return c
+	return c.(*prometheusCounter)
 }
 
 func (m *prometheusMeter) FloatCounter(name string, labels ...string) meter.FloatCounter {
-	m.Lock()
-	defer m.Unlock()
-	nm := m.buildMetric(name)
-	labels = append(m.opts.Labels, labels...)
-	cd, ok := m.floatCounter[nm]
-	h := newHash(labels)
+	clabels := meter.BuildLabels(append(m.opts.Labels, labels...)...)
+	h := newHash(name, clabels)
+	m.mu.Lock()
+	c, ok := m.counter.Load(h)
+	m.mu.Unlock()
 	if !ok {
-		cd = &floatCounters{cs: make(map[uint64]*prometheusFloatCounter)}
-		c := &prometheusFloatCounter{c: prometheus.NewGauge(prometheus.GaugeOpts{Name: nm}), labels: labels}
-		cd.cs[h] = c
-		m.floatCounter[nm] = cd
-		return c
+		var n float64
+		c = &prometheusFloatCounter{
+			name: name,
+			c: &dto.Metric{
+				Gauge: &dto.Gauge{Value: &n},
+				Label: labelMetric(clabels),
+			},
+		}
+		m.mu.Lock()
+		m.counter.Store(h, c)
+		m.mu.Unlock()
 	}
-	c, ok := cd.cs[h]
-	if !ok {
-		c = &prometheusFloatCounter{c: prometheus.NewGauge(prometheus.GaugeOpts{Name: nm}), labels: labels}
-		cd.cs[h] = c
-		m.floatCounter[nm] = cd
-	}
-	return c
+	return c.(*prometheusFloatCounter)
 }
 
 func (m *prometheusMeter) Gauge(name string, fn func() float64, labels ...string) meter.Gauge {
-	m.Lock()
-	defer m.Unlock()
-	nm := m.buildMetric(name)
-	labels = append(m.opts.Labels, labels...)
-	cd, ok := m.gauge[nm]
-	h := newHash(labels)
+	clabels := meter.BuildLabels(append(m.opts.Labels, labels...)...)
+	h := newHash(name, clabels)
+	m.mu.Lock()
+	c, ok := m.gauge.Load(h)
+	m.mu.Unlock()
 	if !ok {
-		cd = &gauges{cs: make(map[uint64]*prometheusGauge)}
-		c := &prometheusGauge{c: prometheus.NewGauge(prometheus.GaugeOpts{Name: nm}), labels: labels}
-		cd.cs[h] = c
-		m.gauge[nm] = cd
-		return c
+		var n float64
+		c = &prometheusGauge{
+			name: name,
+			c: &dto.Metric{
+				Gauge: &dto.Gauge{Value: &n},
+				Label: labelMetric(clabels),
+			},
+		}
+		m.mu.Lock()
+		m.gauge.Store(h, c)
+		m.mu.Unlock()
 	}
-	c, ok := cd.cs[h]
-	if !ok {
-		c = &prometheusGauge{c: prometheus.NewGauge(prometheus.GaugeOpts{Name: nm}), labels: labels}
-		cd.cs[h] = c
-		m.gauge[nm] = cd
-	}
-	return c
+	return c.(*prometheusGauge)
 }
 
 func (m *prometheusMeter) Histogram(name string, labels ...string) meter.Histogram {
-	m.Lock()
-	defer m.Unlock()
-	nm := m.buildMetric(name)
-	labels = append(m.opts.Labels, labels...)
-	cd, ok := m.histogram[nm]
-	h := newHash(labels)
+	clabels := meter.BuildLabels(append(m.opts.Labels, labels...)...)
+	h := newHash(name, clabels)
+	m.mu.Lock()
+	c, ok := m.histogram.Load(h)
+	m.mu.Unlock()
 	if !ok {
-		cd = &histograms{cs: make(map[uint64]*prometheusHistogram)}
-		c := &prometheusHistogram{c: prometheus.NewHistogram(prometheus.HistogramOpts{Name: nm}), labels: labels}
-		cd.cs[h] = c
-		m.histogram[nm] = cd
-		return 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.Store(h, c)
+		m.mu.Unlock()
 	}
-	c, ok := cd.cs[h]
-	if !ok {
-		c = &prometheusHistogram{c: prometheus.NewHistogram(prometheus.HistogramOpts{Name: nm}), labels: labels}
-		cd.cs[h] = c
-		m.histogram[nm] = cd
-	}
-	return c
+	return c.(*prometheusHistogram)
 }
 
 func (m *prometheusMeter) Summary(name string, labels ...string) meter.Summary {
-	m.Lock()
-	defer m.Unlock()
-	nm := m.buildMetric(name)
-	labels = append(m.opts.Labels, labels...)
-	cd, ok := m.summary[nm]
-	h := newHash(labels)
+	clabels := meter.BuildLabels(append(m.opts.Labels, labels...)...)
+	h := newHash(name, clabels)
+	m.mu.Lock()
+	c, ok := m.summary.Load(h)
+	m.mu.Unlock()
 	if !ok {
-		cd = &summaries{cs: make(map[uint64]*prometheusSummary)}
-		c := &prometheusSummary{c: prometheus.NewSummary(prometheus.SummaryOpts{Name: nm}), labels: labels}
-		cd.cs[h] = c
-		m.summary[nm] = cd
-		return 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.Store(h, c)
+		m.mu.Unlock()
 	}
-	c, ok := cd.cs[h]
-	if !ok {
-		c = &prometheusSummary{c: prometheus.NewSummary(prometheus.SummaryOpts{Name: nm}), labels: labels}
-		cd.cs[h] = c
-		m.summary[nm] = cd
-	}
-	return c
+	return c.(*prometheusSummary)
 }
 
 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 = append(m.opts.Labels, labels...)
-	cd, ok := m.summary[nm]
-	h := newHash(labels)
+	clabels := meter.BuildLabels(append(m.opts.Labels, labels...)...)
+	h := newHash(name, clabels)
+	m.mu.Lock()
+	c, ok := m.summary.Load(h)
+	m.mu.Lock()
 	if !ok {
-		cd = &summaries{cs: make(map[uint64]*prometheusSummary)}
-		c := &prometheusSummary{c: prometheus.NewSummary(prometheus.SummaryOpts{
-			Name:       nm,
-			MaxAge:     window,
-			Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
-		}), labels: labels}
-		cd.cs[h] = c
-		m.summary[nm] = cd
-		return 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.Store(h, c)
+		m.mu.Unlock()
 	}
-	c, ok := cd.cs[h]
-	if !ok {
-		c = &prometheusSummary{c: prometheus.NewSummary(prometheus.SummaryOpts{
-			Name:       nm,
-			MaxAge:     window,
-			Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
-		}), labels: labels}
-		cd.cs[h] = c
-		m.summary[nm] = cd
-	}
-	return c
+	return c.(*prometheusSummary)
 }
 
 func (m *prometheusMeter) Init(opts ...meter.Option) error {
 	for _, o := range opts {
 		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
 }
 
@@ -248,13 +221,6 @@ func (m *prometheusMeter) Write(w io.Writer, opts ...meter.Option) error {
 		o(&options)
 	}
 
-	if options.WriteProcessMetrics || options.WriteFDMetrics {
-		pc := collectors.NewProcessCollector(collectors.ProcessCollectorOpts{})
-		_ = m.set.Register(pc)
-		gc := collectors.NewGoCollector(collectors.WithGoCollectorRuntimeMetrics(collectors.GoRuntimeMetricsRule{Matcher: regexp.MustCompile("/.*")}))
-		_ = m.set.Register(gc)
-	}
-
 	g, ok := m.set.(prometheus.Gatherer)
 	if !ok {
 		return fmt.Errorf("set type %T not prometheus.Gatherer", m.set)
@@ -267,83 +233,74 @@ func (m *prometheusMeter) Write(w io.Writer, opts ...meter.Option) error {
 
 	enc := expfmt.NewEncoder(w, expfmt.NewFormat(expfmt.TypeTextPlain))
 
-	for name, metrics := range m.counter {
-		mf := &dto.MetricFamily{
-			Name:   newString(name),
-			Type:   dto.MetricType_GAUGE.Enum(),
-			Metric: make([]*dto.Metric, 0, len(metrics.cs)),
-		}
-		for _, c := range metrics.cs {
-			m := &dto.Metric{}
-			_ = c.c.Write(m)
-			fillMetric(m, c.labels)
-			mf.Metric = append(mf.Metric, m)
-		}
-		mfs = append(mfs, mf)
-	}
+	m.mu.Lock()
 
-	for name, metrics := range m.gauge {
-		mf := &dto.MetricFamily{
-			Name:   newString(name),
-			Type:   dto.MetricType_GAUGE.Enum(),
-			Metric: make([]*dto.Metric, 0, len(metrics.cs)),
-		}
-		for _, c := range metrics.cs {
-			m := &dto.Metric{}
-			_ = c.c.Write(m)
-			fillMetric(m, c.labels)
-			mf.Metric = append(mf.Metric, m)
-		}
+	m.counter.Range(func(_ any, v any) bool {
+		mc := v.(*prometheusCounter)
+		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)
-	}
+		return true
+	})
 
-	for name, metrics := range m.floatCounter {
-		mf := &dto.MetricFamily{
-			Name:   newString(name),
-			Type:   dto.MetricType_GAUGE.Enum(),
-			Metric: make([]*dto.Metric, 0, len(metrics.cs)),
-		}
-		for _, c := range metrics.cs {
-			m := &dto.Metric{}
-			_ = c.c.Write(m)
-			fillMetric(m, c.labels)
-			mf.Metric = append(mf.Metric, m)
-		}
+	m.floatCounter.Range(func(_ any, v any) bool {
+		mc := v.(*prometheusFloatCounter)
+		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)
-	}
+		return true
+	})
 
-	for name, metrics := range m.histogram {
-		mf := &dto.MetricFamily{
-			Name:   newString(name),
-			Type:   dto.MetricType_HISTOGRAM.Enum(),
-			Metric: make([]*dto.Metric, 0, len(metrics.cs)),
-		}
-		for _, c := range metrics.cs {
-			m := &dto.Metric{}
-			_ = c.c.Write(m)
-			fillMetric(m, c.labels)
-			mf.Metric = append(mf.Metric, m)
-		}
+	m.gauge.Range(func(_ any, v any) bool {
+		mc := v.(*prometheusGauge)
+		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)
-	}
+		return true
+	})
 
-	for name, metrics := range m.summary {
-		mf := &dto.MetricFamily{
-			Name:   newString(name),
-			Type:   dto.MetricType_SUMMARY.Enum(),
-			Metric: make([]*dto.Metric, 0, len(metrics.cs)),
-		}
-		for _, c := range metrics.cs {
-			m := &dto.Metric{}
-			_ = c.c.Write(m)
-			fillMetric(m, c.labels)
-			mf.Metric = append(mf.Metric, m)
-		}
+	m.histogram.Range(func(_ any, v any) bool {
+		c := v.(*prometheusHistogram)
+		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)
-	}
+		return true
+	})
+
+	m.summary.Range(func(_ any, v any) bool {
+		mc := v.(*prometheusSummary)
+		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)
+		return true
+	})
+
+	m.mu.Unlock()
 
 	for _, mf := range mfs {
 		_ = enc.Encode(mf)
+		mf.Reset()
+		m.mfPool.Put(mf)
 	}
 
 	if closer, ok := enc.(io.Closer); ok {
@@ -387,117 +344,30 @@ func (m *prometheusMeter) Set(opts ...meter.Option) meter.Meter {
 	return nm
 }
 
-type prometheusCounter struct {
-	c      prometheus.Gauge
-	labels []string
-}
-
-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
-	}
-	return uint64(m.GetGauge().GetValue())
-}
-
-func (c *prometheusCounter) Set(n uint64) {
-	c.c.Set(float64(n))
-}
-
-type prometheusFloatCounter struct {
-	c      prometheus.Gauge
-	labels []string
-}
-
-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
-	}
-	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
-	labels []string
-}
-
-func (c prometheusGauge) Get() float64 {
-	m := &dto.Metric{}
-	if err := c.c.Write(m); err != nil {
-		return 0
-	}
-	return float64(m.GetGauge().GetValue())
-}
-
-type prometheusHistogram struct {
-	c      prometheus.Histogram
-	labels []string
-}
-
-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
-	labels []string
-}
-
-func (c prometheusSummary) Update(n float64) {
-	c.c.Observe(n)
-}
-
-func (c prometheusSummary) UpdateDuration(n time.Time) {
-	c.c.Observe(time.Since(n).Seconds())
-}
-
-func newHash(labels []string) uint64 {
-	h := fnv.New64a()
-	for _, l := range labels {
-		h.Write([]byte(l))
-	}
-	return h.Sum64()
-}
-
-func fillMetric(m *dto.Metric, labels []string) *dto.Metric {
-	m.Label = make([]*dto.LabelPair, 0, len(labels)/2)
-	for idx := 0; idx < len(labels); idx += 2 {
-		m.Label = append(m.Label, &dto.LabelPair{
-			Name:  newString(labels[idx]),
-			Value: newString(labels[idx+1]),
+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 m
+	return dtoLabels
+}
+
+func newHash(n string, l []string) uint64 {
+	h := uint64(14695981039346656037)
+	for i := 0; i < len(n); i++ {
+		h ^= uint64(n[i])
+		h *= 1099511628211
+	}
+	for _, s := range l {
+		for i := 0; i < len(s); i++ {
+			h ^= uint64(s[i])
+			h *= 1099511628211
+		}
+	}
+	return h
 }

prometheus_test.go

@@ -2,11 +2,126 @@ package prometheus
 
 import (
 	"bytes"
+	"context"
+	"fmt"
 	"testing"
 
-	"go.unistack.org/micro/v4/meter"
+	"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"
 )
 
+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()
+	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())
+	}
+
+	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 {
@@ -19,16 +134,24 @@ func TestStd(t *testing.T) {
 	}
 }
 
-func TestBuildName(t *testing.T) {
-	m := NewMeter()
-	check := `micro_foo{aaa="b",bar="baz",ccc="d"}`
-	name := m.buildMetric("micro_foo", "bar", "baz", "aaa", "b", "ccc", "d")
-	if name != check {
-		t.Fatalf("metric name error: %s != %s", name, check)
-	}
+func TestWrapper(t *testing.T) {
+	m := NewMeter() // meter.Labels("test_key", "test_val"))
 
-	cnt := m.Counter("counter", "key", "val")
-	cnt.Inc()
+	ctx := context.Background()
+
+	c := client.NewClient(client.Meter(m))
+	if err := c.Init(); err != nil {
+		t.Fatal(err)
+	}
+	rsp := &codec.Frame{}
+	req := &codec.Frame{}
+	err := c.Call(ctx, c.NewRequest("svc2", "Service.Method", req), rsp)
+	_, _ = 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{endpoint="Service.Method"} 0`)) {
+		t.Fatalf("invalid metrics output: %s", buf.Bytes())
+	}
 }
 
 func TestMultiple(t *testing.T) {
@@ -45,7 +168,9 @@ 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())
+	}
+	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)
+}