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in_memory.go
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/
in_memory.go
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package kvstore
import (
"context"
"fmt"
"math/bits"
"reflect"
"sync/atomic"
"time"
"github.com/justtrackio/gosoline/pkg/cache"
"github.com/justtrackio/gosoline/pkg/cfg"
"github.com/justtrackio/gosoline/pkg/log"
"github.com/justtrackio/gosoline/pkg/mdl"
"github.com/justtrackio/gosoline/pkg/refl"
"github.com/karlseguin/ccache"
)
type InMemoryKvStore[T any] struct {
cache cache.Cache[T]
settings *Settings
cacheSize *int64
}
func NewInMemoryKvStore[T any](_ context.Context, _ cfg.Config, _ log.Logger, settings *Settings) (KvStore[T], error) {
if reflect.ValueOf(new(T)).Elem().Kind() == reflect.Pointer {
return nil, fmt.Errorf("the generic type T should not be a pointer type but is of type %T", *new(T))
}
return NewInMemoryKvStoreWithInterfaces[T](settings), nil
}
func NewInMemoryKvStoreWithInterfaces[T any](settings *Settings) KvStore[T] {
// make sure the config has some sensible values
if settings.MaxSize <= 0 {
settings.MaxSize = 5000
}
if settings.Buckets == 0 {
settings.Buckets = 16
} else if bits.OnesCount32(settings.Buckets) != 1 {
// buckets needs to be a power of two
exponent := 32 - bits.LeadingZeros32(settings.Buckets)
if exponent == 32 {
// user requested more than 2 billion buckets... hope the user knows what he is doing. give as many buckets as possible
exponent = 31
}
settings.Buckets = 1 << exponent
}
if settings.ItemsToPrune == 0 {
settings.ItemsToPrune = uint32(settings.MaxSize / 10)
}
if settings.DeleteBuffer == 0 {
settings.DeleteBuffer = 1024
}
if settings.PromoteBuffer == 0 {
settings.PromoteBuffer = 1024
}
if settings.GetsPerPromote <= 0 {
settings.GetsPerPromote = 3
}
cacheSize := new(int64)
trackDeletes := func(item *ccache.Item) {
// track how many items are still in the cache
atomic.AddInt64(cacheSize, -1)
}
cacheConfig := ccache.Configure().
OnDelete(trackDeletes).
MaxSize(settings.MaxSize).
Buckets(settings.Buckets).
ItemsToPrune(settings.ItemsToPrune).
DeleteBuffer(settings.DeleteBuffer).
PromoteBuffer(settings.PromoteBuffer).
GetsPerPromote(settings.GetsPerPromote)
ttl := settings.Ttl
if ttl == 0 {
ttl = time.Hour
}
baseCache := cache.NewWithConfiguration[T](*cacheConfig, ttl)
return NewMetricStoreWithInterfaces[T](&InMemoryKvStore[T]{
cache: baseCache,
settings: settings,
cacheSize: cacheSize,
}, settings)
}
func (s *InMemoryKvStore[T]) Contains(_ context.Context, key any) (bool, error) {
keyStr, err := CastKeyToString(key)
if err != nil {
return false, fmt.Errorf("can not build string key %T %v: %w", key, key, err)
}
return s.cache.Contains(keyStr), nil
}
func (s *InMemoryKvStore[T]) Get(_ context.Context, key any, value *T) (bool, error) {
keyStr, err := CastKeyToString(key)
if err != nil {
return false, fmt.Errorf("can not build string key %T %v: %w", key, key, err)
}
item, ok := s.cache.Get(keyStr)
if !ok {
return false, nil
}
*value = item
return true, nil
}
func (s *InMemoryKvStore[T]) GetBatch(ctx context.Context, keys any, values any) ([]interface{}, error) {
return getBatch(ctx, keys, values, s.getChunk, s.settings.BatchSize)
}
func (s *InMemoryKvStore[T]) getChunk(ctx context.Context, resultMap *refl.Map, keys []any) ([]interface{}, error) {
missing := make([]interface{}, 0)
for _, key := range keys {
keyString, err := CastKeyToString(key)
if err != nil {
return nil, fmt.Errorf("can not build string key %T %v: %w", key, key, err)
}
element := new(T)
ok, err := s.Get(ctx, key, element)
if err != nil {
return nil, fmt.Errorf("can not get batch element for key %s: %w", keyString, err)
}
if !ok {
missing = append(missing, keyString)
continue
}
if err := resultMap.Set(keyString, element); err != nil {
return nil, fmt.Errorf("can not set new element on result map: %w", err)
}
}
return missing, nil
}
func (s *InMemoryKvStore[T]) Put(_ context.Context, key any, value T) error {
keyStr, err := CastKeyToString(key)
if err != nil {
return fmt.Errorf("can not build string key %T %v: %w", key, key, err)
}
s.cache.Set(keyStr, value)
atomic.AddInt64(s.cacheSize, 1)
return nil
}
func (s *InMemoryKvStore[T]) PutBatch(ctx context.Context, values any) error {
mii, err := refl.InterfaceToMapInterfaceInterface(values)
if err != nil {
return fmt.Errorf("could not convert values from %T to map[interface{}]interface{}", values)
}
for k, v := range mii {
if err = s.Put(ctx, k, v.(T)); err != nil {
return fmt.Errorf("can not put value into in_memory store: %w", err)
}
}
return nil
}
func (s *InMemoryKvStore[T]) EstimateSize() *int64 {
return mdl.Box(atomic.LoadInt64(s.cacheSize))
}
func (s *InMemoryKvStore[T]) Delete(_ context.Context, key any) error {
keyStr, err := CastKeyToString(key)
if err != nil {
return fmt.Errorf("can not build string key %T %v: %w", key, key, err)
}
s.cache.Expire(keyStr)
return nil
}
func (s *InMemoryKvStore[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)
}
for _, key := range si {
if err = s.Delete(ctx, key); err != nil {
return fmt.Errorf("can not remove value from in_memory store: %w", err)
}
}
return nil
}