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package mock
import (
"sync"
"github.com/ydb-platform/ydb/library/go/core/metrics"
"github.com/ydb-platform/ydb/library/go/core/metrics/internal/pkg/metricsutil"
"github.com/ydb-platform/ydb/library/go/core/metrics/internal/pkg/registryutil"
"go.uber.org/atomic"
)
var _ metrics.Registry = (*Registry)(nil)
type Registry struct {
separator string
prefix string
tags map[string]string
allowLoadRegisteredMetrics bool
subregistries map[string]*Registry
m *sync.Mutex
metrics *sync.Map
}
func NewRegistry(opts *RegistryOpts) *Registry {
r := &Registry{
separator: ".",
subregistries: make(map[string]*Registry),
m: new(sync.Mutex),
metrics: new(sync.Map),
}
if opts != nil {
r.separator = string(opts.Separator)
r.prefix = opts.Prefix
r.tags = opts.Tags
r.allowLoadRegisteredMetrics = opts.AllowLoadRegisteredMetrics
}
return r
}
// WithTags creates new sub-scope, where each metric has tags attached to it.
func (r Registry) WithTags(tags map[string]string) metrics.Registry {
return r.newSubregistry(r.prefix, registryutil.MergeTags(r.tags, tags))
}
// WithPrefix creates new sub-scope, where each metric has prefix added to it name.
func (r Registry) WithPrefix(prefix string) metrics.Registry {
return r.newSubregistry(registryutil.BuildFQName(r.separator, r.prefix, prefix), r.tags)
}
func (r Registry) ComposeName(parts ...string) string {
return registryutil.BuildFQName(r.separator, parts...)
}
func (r Registry) Counter(name string) metrics.Counter {
s := &Counter{
Name: r.newMetricName(name),
Tags: r.tags,
Value: new(atomic.Int64),
}
key := registryutil.BuildRegistryKey(s.Name, r.tags)
if val, loaded := r.metrics.LoadOrStore(key, s); loaded {
if r.allowLoadRegisteredMetrics {
return val.(*Counter)
}
panic("metric with key " + key + " already registered")
}
return s
}
func (r Registry) FuncCounter(name string, function func() int64) metrics.FuncCounter {
metricName := r.newMetricName(name)
key := registryutil.BuildRegistryKey(metricName, r.tags)
s := FuncCounter{function: function}
if _, loaded := r.metrics.LoadOrStore(key, s); loaded {
panic("metric with key " + key + " already registered")
}
return s
}
func (r Registry) Gauge(name string) metrics.Gauge {
s := &Gauge{
Name: r.newMetricName(name),
Tags: r.tags,
Value: new(atomic.Float64),
}
key := registryutil.BuildRegistryKey(s.Name, r.tags)
if val, loaded := r.metrics.LoadOrStore(key, s); loaded {
if r.allowLoadRegisteredMetrics {
return val.(*Gauge)
}
panic("metric with key " + key + " already registered")
}
return s
}
func (r Registry) FuncGauge(name string, function func() float64) metrics.FuncGauge {
metricName := r.newMetricName(name)
key := registryutil.BuildRegistryKey(metricName, r.tags)
s := FuncGauge{function: function}
if _, loaded := r.metrics.LoadOrStore(key, s); loaded {
panic("metric with key " + key + " already registered")
}
return s
}
func (r *Registry) IntGauge(name string) metrics.IntGauge {
s := &IntGauge{
Name: r.newMetricName(name),
Tags: r.tags,
Value: new(atomic.Int64),
}
key := registryutil.BuildRegistryKey(s.Name, r.tags)
if val, loaded := r.metrics.LoadOrStore(key, s); loaded {
if r.allowLoadRegisteredMetrics {
return val.(*IntGauge)
}
panic("metric with key " + key + " already registered")
}
return s
}
func (r *Registry) FuncIntGauge(name string, function func() int64) metrics.FuncIntGauge {
metricName := r.newMetricName(name)
key := registryutil.BuildRegistryKey(metricName, r.tags)
s := FuncIntGauge{function: function}
if _, loaded := r.metrics.LoadOrStore(key, s); loaded {
panic("metric with key " + key + " already registered")
}
return s
}
func (r Registry) Timer(name string) metrics.Timer {
s := &Timer{
Name: r.newMetricName(name),
Tags: r.tags,
Value: new(atomic.Duration),
}
key := registryutil.BuildRegistryKey(s.Name, r.tags)
if val, loaded := r.metrics.LoadOrStore(key, s); loaded {
if r.allowLoadRegisteredMetrics {
return val.(*Timer)
}
panic("metric with key " + key + " already registered")
}
return s
}
func (r Registry) Histogram(name string, buckets metrics.Buckets) metrics.Histogram {
s := &Histogram{
Name: r.newMetricName(name),
Tags: r.tags,
BucketBounds: metricsutil.BucketsBounds(buckets),
BucketValues: make([]int64, buckets.Size()),
InfValue: new(atomic.Int64),
}
key := registryutil.BuildRegistryKey(s.Name, r.tags)
if val, loaded := r.metrics.LoadOrStore(key, s); loaded {
if r.allowLoadRegisteredMetrics {
return val.(*Histogram)
}
panic("metric with key " + key + " already registered")
}
return s
}
func (r Registry) DurationHistogram(name string, buckets metrics.DurationBuckets) metrics.Timer {
s := &Histogram{
Name: r.newMetricName(name),
Tags: r.tags,
BucketBounds: metricsutil.DurationBucketsBounds(buckets),
BucketValues: make([]int64, buckets.Size()),
InfValue: new(atomic.Int64),
}
key := registryutil.BuildRegistryKey(s.Name, r.tags)
if val, loaded := r.metrics.LoadOrStore(key, s); loaded {
if r.allowLoadRegisteredMetrics {
return val.(*Histogram)
}
panic("metric with key " + key + " already registered")
}
return s
}
func (r *Registry) newSubregistry(prefix string, tags map[string]string) *Registry {
registryKey := registryutil.BuildRegistryKey(prefix, tags)
r.m.Lock()
defer r.m.Unlock()
if existing, ok := r.subregistries[registryKey]; ok {
return existing
}
subregistry := &Registry{
separator: r.separator,
prefix: prefix,
tags: tags,
allowLoadRegisteredMetrics: r.allowLoadRegisteredMetrics,
subregistries: r.subregistries,
m: r.m,
metrics: r.metrics,
}
r.subregistries[registryKey] = subregistry
return subregistry
}
func (r *Registry) newMetricName(name string) string {
return registryutil.BuildFQName(r.separator, r.prefix, name)
}
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