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metric.go
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metric.go
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package kvstore
import (
"context"
"fmt"
"time"
"github.com/justtrackio/gosoline/pkg/mdl"
"github.com/justtrackio/gosoline/pkg/metric"
"github.com/justtrackio/gosoline/pkg/refl"
)
const (
// number of items stored in the store (if available)
metricNameKvStoreSize = "kvStoreSize"
// number of items we try to read from the store
metricNameKvStoreRead = "kvStoreRead"
// number of items found and read from the store
metricNameKvStoreHit = "kvStoreHit"
// number of items written to the store
metricNameKvStoreWrite = "kvStoreWrite"
// number of items deleted from the store
metricNameKvStoreDelete = "kvStoreDelete"
)
type MetricStore[T any] struct {
KvStore[T]
metricWriter metric.Writer
model string
store string
}
func NewMetricStoreWithInterfaces[T any](store KvStore[T], settings *Settings) KvStore[T] {
if !settings.MetricsEnabled {
return store
}
storeName := fmt.Sprintf("%T", store)
model := (&mdl.ModelId{
Project: settings.Project,
Environment: settings.Environment,
Family: settings.Family,
Group: settings.Group,
Application: settings.Application,
Name: settings.Name,
}).String()
defaults := getDefaultMetrics(model, storeName)
s := &MetricStore[T]{
KvStore: store,
metricWriter: metric.NewWriter(defaults...),
model: model,
store: storeName,
}
if sizedStore, ok := store.(SizedStore[T]); ok {
go s.recordSize(sizedStore)
}
return s
}
func (s *MetricStore[T]) Contains(ctx context.Context, key any) (bool, error) {
s.recordReads(1)
found, err := s.KvStore.Contains(ctx, key)
if found && err == nil {
s.recordHits(1)
}
return found, err
}
func (s *MetricStore[T]) Get(ctx context.Context, key any, value *T) (bool, error) {
s.recordReads(1)
found, err := s.KvStore.Get(ctx, key, value)
if found && err == nil {
s.recordHits(1)
}
return found, err
}
func (s *MetricStore[T]) GetBatch(ctx context.Context, keys any, result any) ([]interface{}, error) {
keySlice, err := refl.InterfaceToInterfaceSlice(keys)
if err != nil {
return nil, fmt.Errorf("can not morph keys to slice of interfaces: %w", err)
}
s.recordReads(len(keySlice))
missing, err := s.KvStore.GetBatch(ctx, keySlice, result)
if err == nil {
s.recordHits(len(keySlice) - len(missing))
}
return missing, err
}
func (s *MetricStore[T]) Put(ctx context.Context, key any, value T) error {
err := s.KvStore.Put(ctx, key, value)
if err == nil {
s.recordWrites(1)
}
return nil
}
func (s *MetricStore[T]) PutBatch(ctx context.Context, values any) error {
mii, err := refl.InterfaceToMapInterfaceInterface(values)
if err != nil {
return fmt.Errorf("could not convert values to map[interface{}]interface{}: %w", err)
}
err = s.KvStore.PutBatch(ctx, mii)
if err == nil {
s.recordWrites(len(mii))
}
return nil
}
func (s *MetricStore[T]) Delete(ctx context.Context, key any) error {
err := s.KvStore.Delete(ctx, key)
if err == nil {
s.recordDeletes(1)
}
return err
}
func (s *MetricStore[T]) DeleteBatch(ctx context.Context, keys any) error {
si, err := refl.InterfaceToInterfaceSlice(keys)
if err != nil {
return fmt.Errorf("could not convert keys from %T to []interface{}: %w", keys, err)
}
err = s.KvStore.DeleteBatch(ctx, si)
if err == nil {
s.recordDeletes(len(si))
}
return err
}
func (s *MetricStore[T]) recordSize(sizedStore SizedStore[T]) {
ticker := time.NewTicker(time.Minute)
for range ticker.C {
size := sizedStore.EstimateSize()
if size != nil {
s.record(metricNameKvStoreSize, *size)
}
}
}
func (s *MetricStore[T]) recordReads(count int) {
s.record(metricNameKvStoreRead, int64(count))
}
func (s *MetricStore[T]) recordHits(count int) {
s.record(metricNameKvStoreHit, int64(count))
}
func (s *MetricStore[T]) recordWrites(count int) {
s.record(metricNameKvStoreWrite, int64(count))
}
func (s *MetricStore[T]) recordDeletes(count int) {
s.record(metricNameKvStoreDelete, int64(count))
}
func (s *MetricStore[T]) record(name string, value int64) {
s.metricWriter.WriteOne(&metric.Datum{
Priority: metric.PriorityHigh,
MetricName: name,
Dimensions: map[string]string{
"model": s.model,
"store": s.store,
},
Value: float64(value),
Unit: metric.UnitCount,
})
}
func getDefaultMetrics(model string, store string) metric.Data {
// no default for the size, if we don't know the size, it is not 0
return metric.Data{
{
Priority: metric.PriorityHigh,
MetricName: metricNameKvStoreRead,
Dimensions: map[string]string{
"model": model,
"store": store,
},
Unit: metric.UnitCount,
Value: 0.0,
},
{
Priority: metric.PriorityHigh,
MetricName: metricNameKvStoreHit,
Dimensions: map[string]string{
"model": model,
"store": store,
},
Unit: metric.UnitCount,
Value: 0.0,
},
{
Priority: metric.PriorityHigh,
MetricName: metricNameKvStoreWrite,
Dimensions: map[string]string{
"model": model,
"store": store,
},
Unit: metric.UnitCount,
Value: 0.0,
},
{
Priority: metric.PriorityHigh,
MetricName: metricNameKvStoreDelete,
Dimensions: map[string]string{
"model": model,
"store": store,
},
Unit: metric.UnitCount,
Value: 0.0,
},
}
}