dendrite/common/caching/immutableinmemorylru.go

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package caching
import (
"fmt"
lru "github.com/hashicorp/golang-lru"
"github.com/matrix-org/gomatrixserverlib"
)
type ImmutableInMemoryLRUCache struct {
roomVersions *lru.Cache
}
func NewImmutableInMemoryLRUCache() (*ImmutableInMemoryLRUCache, error) {
roomVersionCache, rvErr := lru.New(RoomVersionMaxCacheEntries)
if rvErr != nil {
return nil, rvErr
}
return &ImmutableInMemoryLRUCache{
roomVersions: roomVersionCache,
}, nil
}
func checkForInvalidMutation(cache *lru.Cache, key string, value interface{}) {
if peek, ok := cache.Peek(key); ok && peek != value {
panic(fmt.Sprintf("invalid use of immutable cache tries to mutate existing value of %q", key))
}
}
func (c *ImmutableInMemoryLRUCache) GetRoomVersion(roomID string) (gomatrixserverlib.RoomVersion, bool) {
val, found := c.roomVersions.Get(roomID)
if found && val != nil {
if roomVersion, ok := val.(gomatrixserverlib.RoomVersion); ok {
return roomVersion, true
}
}
return "", false
}
func (c *ImmutableInMemoryLRUCache) StoreRoomVersion(roomID string, roomVersion gomatrixserverlib.RoomVersion) {
checkForInvalidMutation(c.roomVersions, roomID, roomVersion)
c.roomVersions.Add(roomID, roomVersion)
}