Initial cloud-services repo - gateway service + pkg modules

pkg/dbc/models/invalid_id_cache.go

@@ -0,0 +1,47 @@
+package models
+
+import (
+	"fmt"
+	"sync"
+
+	"fiskerinc.com/modules/cache"
+	"fiskerinc.com/modules/utils/envtool"
+)
+
+var (
+	max_invalid_cache    = envtool.GetEnvInt("MAX_INVALID_CANID_CACHE", 100)
+	invalidCANIDOnce     sync.Once
+	invalidCANIDInstance InvalidCANIDCacheInterface
+)
+
+func NewInvalidCANIDCache() InvalidCANIDCacheInterface {
+	return &InvalidCANIDCache{
+		ringMap: cache.NewRingMap(max_invalid_cache),
+	}
+}
+
+func GetInvalidCANIDCache() InvalidCANIDCacheInterface {
+	invalidCANIDOnce.Do(func() {
+		if invalidCANIDInstance == nil {
+			invalidCANIDInstance = NewInvalidCANIDCache()
+		}
+	})
+
+	return invalidCANIDInstance
+}
+
+func SetInvalidCANIDCache(instance InvalidCANIDCacheInterface) {
+	invalidCANIDInstance = instance
+}
+
+type InvalidCANIDCacheInterface interface {
+	Exists(dbc string, can_id int32) bool
+}
+
+type InvalidCANIDCache struct {
+	ringMap *cache.RingMap
+}
+
+func (i *InvalidCANIDCache) Exists(dbc string, can_id int32) bool {
+	return !i.ringMap.Set(fmt.Sprintf("%s:%d", dbc[0:4], can_id), false)
+}