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tally_provider.go
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tally_provider.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package metrics
import (
"context"
"errors"
"fmt"
"io"
"net/http"
"sort"
"sync"
"time"
"github.com/cactus/go-statsd-client/statsd"
"github.com/op/go-logging"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/uber-go/tally"
promreporter "github.com/uber-go/tally/prometheus"
statsdreporter "github.com/uber-go/tally/statsd"
)
var logger = logging.MustGetLogger("common/metrics/tally")
var scopeRegistryKey = tally.KeyForPrefixedStringMap
type counter struct {
tallyCounter tally.Counter
}
func newCounter(tallyCounter tally.Counter) *counter {
return &counter{tallyCounter: tallyCounter}
}
func (c *counter) Inc(v int64) {
c.tallyCounter.Inc(v)
}
type gauge struct {
tallyGauge tally.Gauge
}
func newGauge(tallyGauge tally.Gauge) *gauge {
return &gauge{tallyGauge: tallyGauge}
}
func (g *gauge) Update(v float64) {
g.tallyGauge.Update(v)
}
type scopeRegistry struct {
sync.RWMutex
subScopes map[string]*scope
}
type scope struct {
separator string
prefix string
tags map[string]string
tallyScope tally.Scope
registry *scopeRegistry
baseReporter tally.BaseStatsReporter
cm sync.RWMutex
gm sync.RWMutex
counters map[string]*counter
gauges map[string]*gauge
}
func newRootScope(opts tally.ScopeOptions, interval time.Duration) Scope {
s, _ := tally.NewRootScope(opts, interval)
var baseReporter tally.BaseStatsReporter
if opts.Reporter != nil {
baseReporter = opts.Reporter
} else if opts.CachedReporter != nil {
baseReporter = opts.CachedReporter
}
return &scope{
prefix: opts.Prefix,
separator: opts.Separator,
tallyScope: s,
registry: &scopeRegistry{
subScopes: make(map[string]*scope),
},
baseReporter: baseReporter,
counters: make(map[string]*counter),
gauges: make(map[string]*gauge)}
}
func newStatsdReporter(statsdReporterOpts StatsdReporterOpts) (tally.StatsReporter, error) {
if statsdReporterOpts.Address == "" {
return nil, errors.New("missing statsd server Address option")
}
if statsdReporterOpts.FlushInterval <= 0 {
return nil, errors.New("missing statsd FlushInterval option")
}
if statsdReporterOpts.FlushBytes <= 0 {
return nil, errors.New("missing statsd FlushBytes option")
}
statter, err := statsd.NewBufferedClient(statsdReporterOpts.Address,
"", statsdReporterOpts.FlushInterval, statsdReporterOpts.FlushBytes)
if err != nil {
return nil, err
}
opts := statsdreporter.Options{}
reporter := statsdreporter.NewReporter(statter, opts)
statsdReporter := &statsdReporter{reporter: reporter, statter: statter}
return statsdReporter, nil
}
func newPromReporter(promReporterOpts PromReporterOpts) (promreporter.Reporter, error) {
if promReporterOpts.ListenAddress == "" {
return nil, errors.New("missing prometheus listenAddress option")
}
opts := promreporter.Options{Registerer: prometheus.NewRegistry()}
reporter := promreporter.NewReporter(opts)
mux := http.NewServeMux()
handler := promReporterHttpHandler(opts.Registerer.(*prometheus.Registry))
mux.Handle("/metrics", handler)
server := &http.Server{Addr: promReporterOpts.ListenAddress, Handler: mux}
promReporter := &promReporter{
reporter: reporter,
server: server,
registry: opts.Registerer.(*prometheus.Registry)}
return promReporter, nil
}
func (s *scope) Counter(name string) Counter {
s.cm.RLock()
val, ok := s.counters[name]
s.cm.RUnlock()
if !ok {
s.cm.Lock()
val, ok = s.counters[name]
if !ok {
counter := s.tallyScope.Counter(name)
val = newCounter(counter)
s.counters[name] = val
}
s.cm.Unlock()
}
return val
}
func (s *scope) Gauge(name string) Gauge {
s.gm.RLock()
val, ok := s.gauges[name]
s.gm.RUnlock()
if !ok {
s.gm.Lock()
val, ok = s.gauges[name]
if !ok {
gauge := s.tallyScope.Gauge(name)
val = newGauge(gauge)
s.gauges[name] = val
}
s.gm.Unlock()
}
return val
}
func (s *scope) Tagged(tags map[string]string) Scope {
originTags := tags
tags = mergeRightTags(s.tags, tags)
key := scopeRegistryKey(s.prefix, tags)
s.registry.RLock()
existing, ok := s.registry.subScopes[key]
if ok {
s.registry.RUnlock()
return existing
}
s.registry.RUnlock()
s.registry.Lock()
defer s.registry.Unlock()
existing, ok = s.registry.subScopes[key]
if ok {
return existing
}
subScope := &scope{
separator: s.separator,
prefix: s.prefix,
// NB(r): Take a copy of the tags on creation
// so that it cannot be modified after set.
tags: copyStringMap(tags),
tallyScope: s.tallyScope.Tagged(originTags),
registry: s.registry,
counters: make(map[string]*counter),
gauges: make(map[string]*gauge),
}
s.registry.subScopes[key] = subScope
return subScope
}
func (s *scope) SubScope(prefix string) Scope {
key := scopeRegistryKey(s.fullyQualifiedName(prefix), s.tags)
s.registry.RLock()
existing, ok := s.registry.subScopes[key]
if ok {
s.registry.RUnlock()
return existing
}
s.registry.RUnlock()
s.registry.Lock()
defer s.registry.Unlock()
existing, ok = s.registry.subScopes[key]
if ok {
return existing
}
subScope := &scope{
separator: s.separator,
prefix: s.prefix,
// NB(r): Take a copy of the tags on creation
// so that it cannot be modified after set.
tags: copyStringMap(s.tags),
tallyScope: s.tallyScope.SubScope(prefix),
registry: s.registry,
counters: make(map[string]*counter),
gauges: make(map[string]*gauge),
}
s.registry.subScopes[key] = subScope
return subScope
}
func (s *scope) Close() error {
if closer, ok := s.tallyScope.(io.Closer); ok {
return closer.Close()
}
return nil
}
func (s *scope) Start() error {
if server, ok := s.baseReporter.(serve); ok {
return server.Start()
}
return nil
}
type statsdReporter struct {
reporter tally.StatsReporter
statter statsd.Statter
}
type promReporter struct {
reporter promreporter.Reporter
server *http.Server
registry *prometheus.Registry
}
func (r *statsdReporter) ReportCounter(name string, tags map[string]string, value int64) {
r.reporter.ReportCounter(tagsToName(name, tags), tags, value)
}
func (r *statsdReporter) ReportGauge(name string, tags map[string]string, value float64) {
r.reporter.ReportGauge(tagsToName(name, tags), tags, value)
}
func (r *statsdReporter) ReportTimer(name string, tags map[string]string, interval time.Duration) {
r.reporter.ReportTimer(tagsToName(name, tags), tags, interval)
}
func (r *statsdReporter) ReportHistogramValueSamples(
name string,
tags map[string]string,
buckets tally.Buckets,
bucketLowerBound,
bucketUpperBound float64,
samples int64,
) {
r.reporter.ReportHistogramValueSamples(tagsToName(name, tags), tags, buckets, bucketLowerBound, bucketUpperBound, samples)
}
func (r *statsdReporter) ReportHistogramDurationSamples(
name string,
tags map[string]string,
buckets tally.Buckets,
bucketLowerBound,
bucketUpperBound time.Duration,
samples int64,
) {
r.reporter.ReportHistogramDurationSamples(tagsToName(name, tags), tags, buckets, bucketLowerBound, bucketUpperBound, samples)
}
func (r *statsdReporter) Capabilities() tally.Capabilities {
return r
}
func (r *statsdReporter) Reporting() bool {
return true
}
func (r *statsdReporter) Tagging() bool {
return true
}
func (r *statsdReporter) Flush() {
// no-op
}
func (r *statsdReporter) Close() error {
return r.statter.Close()
}
func (r *promReporter) RegisterCounter(
name string,
tagKeys []string,
desc string,
) (*prometheus.CounterVec, error) {
return r.reporter.RegisterCounter(name, tagKeys, desc)
}
// AllocateCounter implements tally.CachedStatsReporter.
func (r *promReporter) AllocateCounter(name string, tags map[string]string) tally.CachedCount {
return r.reporter.AllocateCounter(name, tags)
}
func (r *promReporter) RegisterGauge(
name string,
tagKeys []string,
desc string,
) (*prometheus.GaugeVec, error) {
return r.reporter.RegisterGauge(name, tagKeys, desc)
}
// AllocateGauge implements tally.CachedStatsReporter.
func (r *promReporter) AllocateGauge(name string, tags map[string]string) tally.CachedGauge {
return r.reporter.AllocateGauge(name, tags)
}
func (r *promReporter) RegisterTimer(
name string,
tagKeys []string,
desc string,
opts *promreporter.RegisterTimerOptions,
) (promreporter.TimerUnion, error) {
return r.reporter.RegisterTimer(name, tagKeys, desc, opts)
}
// AllocateTimer implements tally.CachedStatsReporter.
func (r *promReporter) AllocateTimer(name string, tags map[string]string) tally.CachedTimer {
return r.reporter.AllocateTimer(name, tags)
}
func (r *promReporter) AllocateHistogram(
name string,
tags map[string]string,
buckets tally.Buckets,
) tally.CachedHistogram {
return r.reporter.AllocateHistogram(name, tags, buckets)
}
func (r *promReporter) Capabilities() tally.Capabilities {
return r
}
func (r *promReporter) Reporting() bool {
return true
}
func (r *promReporter) Tagging() bool {
return true
}
// Flush does nothing for prometheus
func (r *promReporter) Flush() {
}
func (r *promReporter) Close() error {
//TODO: Timeout here?
return r.server.Shutdown(context.Background())
}
func (r *promReporter) Start() error {
return r.server.ListenAndServe()
}
func (r *promReporter) HTTPHandler() http.Handler {
return promReporterHttpHandler(r.registry)
}
func (s *scope) fullyQualifiedName(name string) string {
if len(s.prefix) == 0 {
return name
}
return fmt.Sprintf("%s%s%s", s.prefix, s.separator, name)
}
// mergeRightTags merges 2 sets of tags with the tags from tagsRight overriding values from tagsLeft
func mergeRightTags(tagsLeft, tagsRight map[string]string) map[string]string {
if tagsLeft == nil && tagsRight == nil {
return nil
}
if len(tagsRight) == 0 {
return tagsLeft
}
if len(tagsLeft) == 0 {
return tagsRight
}
result := make(map[string]string, len(tagsLeft)+len(tagsRight))
for k, v := range tagsLeft {
result[k] = v
}
for k, v := range tagsRight {
result[k] = v
}
return result
}
func copyStringMap(stringMap map[string]string) map[string]string {
result := make(map[string]string, len(stringMap))
for k, v := range stringMap {
result[k] = v
}
return result
}
func tagsToName(name string, tags map[string]string) string {
var keys []string
for k := range tags {
keys = append(keys, k)
}
sort.Strings(keys)
for _, k := range keys {
name = name + tally.DefaultSeparator + k + "-" + tags[k]
}
return name
}
func promReporterHttpHandler(registry *prometheus.Registry) http.Handler {
return promhttp.HandlerFor(registry, promhttp.HandlerOpts{})
}