a466e9e9cc
* Experimental LRU cache for room versions * Don't accidentally try to type-assert nil * Also reduce hits on query API * Use hashicorp implementation which mutexes for us * Define const for max cache entries * Rename to be specifically immutable, panic if we try to mutate a cache entry * Review comments * Remove nil guards, give roomserver integration test a cache * go mod tidy
43 lines
1.2 KiB
Go
43 lines
1.2 KiB
Go
package caching
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import (
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"fmt"
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lru "github.com/hashicorp/golang-lru"
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"github.com/matrix-org/gomatrixserverlib"
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)
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type ImmutableInMemoryLRUCache struct {
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roomVersions *lru.Cache
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}
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func NewImmutableInMemoryLRUCache() (*ImmutableInMemoryLRUCache, error) {
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roomVersionCache, rvErr := lru.New(RoomVersionMaxCacheEntries)
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if rvErr != nil {
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return nil, rvErr
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}
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return &ImmutableInMemoryLRUCache{
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roomVersions: roomVersionCache,
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}, nil
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}
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func checkForInvalidMutation(cache *lru.Cache, key string, value interface{}) {
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if peek, ok := cache.Peek(key); ok && peek != value {
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panic(fmt.Sprintf("invalid use of immutable cache tries to mutate existing value of %q", key))
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}
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}
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func (c *ImmutableInMemoryLRUCache) GetRoomVersion(roomID string) (gomatrixserverlib.RoomVersion, bool) {
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val, found := c.roomVersions.Get(roomID)
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if found && val != nil {
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if roomVersion, ok := val.(gomatrixserverlib.RoomVersion); ok {
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return roomVersion, true
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}
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}
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return "", false
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}
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func (c *ImmutableInMemoryLRUCache) StoreRoomVersion(roomID string, roomVersion gomatrixserverlib.RoomVersion) {
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checkForInvalidMutation(c.roomVersions, roomID, roomVersion)
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c.roomVersions.Add(roomID, roomVersion)
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}
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