74 lines
1.6 KiB
Go
74 lines
1.6 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/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promauto"
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)
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func NewInMemoryLRUCache() (*Caches, error) {
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roomVersions, err := NewInMemoryLRUCachePartition(
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RoomVersionCacheName,
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RoomVersionCacheMutable,
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RoomVersionCacheMaxEntries,
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)
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if err != nil {
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return nil, err
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}
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serverKeys, err := NewInMemoryLRUCachePartition(
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ServerKeyCacheName,
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ServerKeyCacheMutable,
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ServerKeyCacheMaxEntries,
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)
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if err != nil {
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return nil, err
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}
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return &Caches{
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RoomVersions: roomVersions,
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ServerKeys: serverKeys,
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}, nil
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}
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type InMemoryLRUCachePartition struct {
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name string
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mutable bool
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maxEntries int
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lru *lru.Cache
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}
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func NewInMemoryLRUCachePartition(name string, mutable bool, maxEntries int) (*InMemoryLRUCachePartition, error) {
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var err error
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cache := InMemoryLRUCachePartition{
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name: name,
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mutable: mutable,
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maxEntries: maxEntries,
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}
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cache.lru, err = lru.New(maxEntries)
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if err != nil {
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return nil, err
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}
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promauto.NewGaugeFunc(prometheus.GaugeOpts{
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Namespace: "dendrite",
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Subsystem: "caching_in_memory_lru",
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Name: name,
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}, func() float64 {
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return float64(cache.lru.Len())
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})
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return &cache, nil
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}
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func (c *InMemoryLRUCachePartition) Set(key string, value interface{}) {
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if !c.mutable {
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if peek, ok := c.lru.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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c.lru.Add(key, value)
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}
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func (c *InMemoryLRUCachePartition) Get(key string) (value interface{}, ok bool) {
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return c.lru.Get(key)
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}
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